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a high energy planetary ball mill

high-energy planetary mills milling equipment of the highest energy density

high-energy planetary mills milling equipment of the highest energy density

Planetary mills are usually provided with 3 or 4 jars (drums) rotating around the central axis and simultaneously around their own axes in the opposite direction (like the planets rotate around the Sun). Material and milling bodies (usually balls) are loaded into the jars. The treated material particles undergo multiple collisions with the grinding media and the jar walls. The efficiency of planetary mills is the result of the high kinetic energy of grinding media. High velocity of moving milling bodies exerts high stress on the activated material.

During grinding in a conventional ball mill, milling bodies fall down under the action of gravity. Gravitational acceleration is 1 G. In planetary mills centrifugal motion of jars with high accelerations is applied. Acceleration in laboratory-scale planetary mills reaches 28-60 G and higher values. Acceleration in industrial-scale planetary mills is 20 G. It is clear that forces influencing

the treated material in planetary mills more than tenfolds exceed forces imposed on the material in conventional milling equipment. The milling process carried out in planetary mills is faster and more efficient. For instance, during the production of fine WC powder it is an usual practice to mill tungsten carbide powder in a ball mill for 130 hours. In a planetary mill characteristic time of WC milling down to submicron level ranges from 15 to 30 minutes. The energy density of a planetary mill can be estimated by dividing its capacity by the volume of the working chamber. The energy density of planetary mills can 1000 times exceed the corresponding parameters of conventional ball mills. Planetary mills of high accelerations have higher energy densities in comparison with attritors, vibration grinding mills, jet-type mills, and desintegrators. Planetary mills of foreign producers are known on the market of laboratory equipment.

Accelerations actually used in these mills usually do not exceed 7-8 G. The industrial-scale analogs of such mills do not exist. In the scopes of the Activation project the efficiencies of milling in various laboratory-scale planetary mills were compared. Tungsten carbide particle size of 120-180 nm was attained 18-30 times faster in a planetary mill available from Russian producer in comparison with an analog commercially available from foreign producer. It is even sometimes discussed in the relevant literature that it is principally impossible to scale up planetary mills and to create the equipment of higher throughput rate. Indeed, the task of continuous loading and unloading a material into and from the jars rotating at high speed is technically very complicated. Nevertheless the problem was successfully solved and there is a wide dimension type range of commercially available industrial planetary mills produced in Russia.

If we deal with a planetary mill of periodic action, it is necessary to load milling bodies and the treated material in jars, install the jars in a fastening device, perform milling and discharge the powder obtained. In the mills of continuous action, as follows from their name, loading and unloading processes are effected in a continuous manner. There are commercially available batch-type planetary mills where the volume of a material loaded in one jar ranges from 75 ml up to 2.4 l. Usually there are 4 drums in one mill. Milling is fast enough and throughput rate can attain 36 kg/h. High-performance mills use accelerations up to 20 G. In the autogeneous grinding mode, the coarseness of initial material can be up to 60 mm for the largest batch-type planetary mill available. The main task of such mills is to perform small production programs in industrial conditions. They are used in the fields of sample preparation for physico-chemical analysis, mixing of components, mechanical alloying, production of fine and superfine powders for powder metallurgy, in small-scale production of pigments, abrasive materials, pharmaceutical preparations, selective milling for exploration of precious metals and diamonds, and activation of ore concentrates before hydrometallurgical treatment.

Milling of different materials has its own specific features. Some materials require special linings and an inert gas atmosphere. Commercially available continuous-type planetary mills have throughput rate in the range from 20 kg/h to 12 tons/h for the powder less than 10 mcm. They combine both high throughput rate for superfine powders and compactability. The specific throughput rate of planetary mills is from 10 to 30 times as great as one of conventional milling equipment. The drawbacks of conventional ball mills are well known: large overall dimensions, huge energy consumption, and low milling efficiency. Planetary mills do not require a heavy and expensive foundation. Their operating costs are several times less than for conventional milling equipment.

Industrial-scale dry milling supposes using of processing lines including (besides a mill) classifier, filter, and fan. Organization of large-scale and efficient production of fine nanostructured powders requires the creation of technologies based on planetary mills. These planetary mills have performance specifications which allow to eliminate several stages of crushing and milling used in conventional process design. Under the influence of impact of milling bodies moving at high accelerations the physico-chemical properties of powders are being changed as a result of intensive mechanical treatment. Mechanically activated particles have increased reactivity and are more reactive compared to particles obtained by other methods.

Mechanically activated ceramic powders can be sintered at lower temperatures compared to non-activated ones. Using milling equipment of a new type it is possible not only to decrease particle size but also to obtain mechanically activated powders having new physico-chemical properties. Planetary mills have wide perspectives of application in the fields of powder metallurgy, mechanical alloying, and development of dispersion-strengthened alloys. As a result of mechanical alloying of aluminium-based alloys (the Activation project) the whole process was accelerated, the high level of coverage by metal of reinforcement solid particles, high adhesion, and proper solid phase distribution in metallic matrix were attained. The results obtained along with the analysis of literature data without any doubts demonstrate the high potential of planetary mills applications in various fields where fine grinding is required (fine grinding is one of the most expensive process stages in large-scale production).

planetary milling equipment | planetary ball mills mse supplies llc

planetary milling equipment | planetary ball mills mse supplies llc

Planetary ball mills are much smaller in comparison to common ball mills and are largely used in laboratories to grind sample materials to very small sizes. For this purpose, there are specific types of equipment as can be seen on our website. They are used across several industry fields, including chemicals, ceramics, environmental protection, medicine, mines, and geology.

The noise produced in these ball mills, which make them ideal for laboratory use. Using them, one can grind powder samples in vacuum state as well, if vacuum mill jars are present in the ball mill. One gets to see excellent workmanship on all the equipment available here.

Quality of the equipment available on our website is guaranteed to be excellent. We attach immense importance to customer satisfaction and strive for high levels each time. You can send feedback about products as well, and we will continue to improve them accordingly.

planetary ball mill

planetary ball mill

The 911MPEPB500 Planetary Ball Mills are used for fine grinding of soft, hard to brittle or fibrous materials. Dry and wet grindings are possible. They support the daily sample preparation for laboratory- and development usage.

Planetary Ball Mills consist of several cylindrical grinding jars (positioned on the sun wheel as shown on the figure) which are filled with loose grinding balls. Two superimposed rotational movements move the grinding jars:

Like in a planetary system the grinding jar rotates on a orbit around the centre. This rotational movement is the self-rotation of the grinding container superimposed. The resulting centrifugal and acting acceleration forces lead to strong grinding effects. Furthermore there are forces working according to the coriolis acceleration. The result is an intensive grinding effect between the grinding balls and the sample.

Depending on the speed ratio different movement patters of the grinding balls / media can be achieved. It can be achieved that the grinding media are crossing the grinding jar and loosen from the wall. At hitting the wall of the grinding jar the sample will be stressed. At a different motion pattern the grinding balls roll over the sample and stress the ground material.

The selection of the right grinding jar and the correct filling level has a big impact on the grinding result. According to the application you have to select the correct material and amount/volume for the grinding jar and the grinding balls.

A jar filling should consist of about 1/3 sample and 1/3 ball charge. The remaining third is the free jar volume that is necessary for the movement of the balls. The following table provides recommendations.

Planetary ball mill is a very often used machine for mechanical alloying, especially in Europe. Because very small amount of powder (for example, as little as a few grammes), is required, the machine is suitable for research purposes in the laboratory. A typical planetary ball mill consists of one turn disc (sometimes called turn table) and two or four bowls. The turn disc rotates in one direction while the bowls rotate in the opposite direction. The centrifugal forces created by the rotation of the Mechanical Alloying.

A short milling duration of only 30 to 60 min. In cases where relatively high temperature is necessary to promote reaction rate, even this may be an added advantage to the process. In addition, the planetary ball mill may be modified by incorporating temperature control elements.

Two types of bowls are commercially available: steel including hardened chrome steel, stainless CrNi-steel and hardmetal tungsten carbide (WC+Co) and ceramic bowls including sintered corundum (Al2O3), agate (SiO2) and zirconium oxide (ZrO2). They generally are available in three different sizes of 80, 250 and 500ml. For high energy mechanical alloying, however, steel bowls are recommended since ceramic bowls can cause contamination due to minute chipped off or fractured particles from the brittle surfaces of the milling bowl and balls. Generally, bowls and balls of the same material are employed in the mechanical alloying process to avoid the possibility of cross contamination from different materials.

Based on powder particle size and impact energy required, balls with size of 10 to 30 mm are normally used. If the size of the balls is too small, impact energy may be too low for alloying to take place. In order to increase impact energy without increasing the rotational speed, balls with high density such as tungsten balls may be employed. Table 2.1 gives the recommended number of balls per bowl to be applied.

Table 2.2 gives a summary of abrasion properties and densities for the selection of bowl and ball materials. It can be seen that the oxide materials show the lowest density while tungsten carbide, the highest density. Hence, at the same rotational speed and ball size, the oxide ball with the lowest density will generate the lowest collision energy.

Another popular mill for conducting MA experiments is the planetary ball mill (referred to as Pulverisette) in which a few hundred grams of the powder can be milled at the same time (Fig. 4.4). These are manufactured by Fritsch GmbH (Industriestrae 8. D-55743 Idar-Oberstein, Germany; +49-6784-70 146 www.FRITSCH.de) and marketed by Gilson Co. in the United States and Canada (P.O. Box 200, Lewis Center, OH 43085-0677, USA, Tel: 1-800-444-1508 or 740-548-7298; www.globalgilson.com). The planetary ball mill owes its name to the planet-like movement of its vials. These are arranged on a rotating support disk, and a special drive mechanism causes them to rotate around their own axes. The centrifugal force produced by the vials rotating around their own axes and that produced by the rotating support disk both act on the vial contents, consisting of the material to be ground and the grinding balls. Since the vials and the supporting disk rotate in opposite directions, the centrifugal forces alternately act in like and opposite directions. This causes the grinding balls to run down the inside wall of the vialthe friction effect, followed by the material being ground and the grinding balls lifting off and traveling freely through the inner chamber of the vial and colliding with the opposing inside wallthe impact effect. The grinding balls impacting with each other intensify the impact effect considerably.

The grinding balls in the planetary mills acquire much higher impact energy than is possible with simple pure gravity or centrifugal mills. The impact energy acquired depends on the speed of the planetary mill and can reach about 20 times the earths acceleration. As the speed is reduced, the grinding balls lose the impact energy, and when the energy is sufficiently low there is no grinding involved; only mixing occurs in the sample.

Even though the disk and the vial rotation speeds could not be independently controlled in the early versions, it is possible to do so in the modern versions of the Fritsch planetary ball mills. In a single mill one can have either two (Pulverisette 5 or 7) or four (Pulverisette 5) milling stations. Recently, a single-station mill was also developed (Pulverisette 6). Three different sizes of containers, with capacities of 80. 250, and 500 ml. are available. Grinding vials and balls are available in eight different materials agate, silicon nitride, sintered corundum, zirconia, chrome steel, Cr-Ni steel, tungsten carbide, and plastic polyamide. Even though the linear velocity of the balls in this type of mill is higher than that in the SPEX mills, the frequency of impacts is much less than in the SPEX mills. Hence, in comparison to SPEX mills, Fritsch Pulverisette can be considered as lower energy mills.

Some high-energy planetary ball mills have been developed by Russian scientists, and these have been designated as AGO mills, such as AGO-2U and AGO-2M. The high energy of these mills is derived from the very high rotation speeds that are achievable. For example, Salimon et al. used their planetary ball mill at a rotation speed of 1235 rpm corresponding to the mill energy intensity of 50 W/g. It has been reported that some of these mills can be used at rotation speeds greater than 2000 rpm.

A recent development in the design of the Fritsch mills has been the incorporation of a gas pressure and temperature measuring system (GTM) for in situ data acquisition during milling. Generally, the occurrence of phase changes in the milled powder is interpreted or inferred by analyzing the powder constitution after milling has been stopped. Sometimes a small quantity of the powder is removed from the charge in the mill and analyzed to obtain information on the progress of alloying and/or phase transformations. This method could lead to some errors because the state of the powder during milling could be different from what it is after the milling has been stopped. To overcome this difficulty, Fritsch GmbH developed the GTM system to enable the operator to obtain data during milling.

The basic idea of this measuring system is the quick and continuous determination of temperature and pressure during the milling process. The temperature measured corresponds to the total temperature rise in the system due to the combination of grinding, impact, and phase transformation processes. Since the heat capacity of the container and the grinding medium is much higher than the mass of the powder, it is necessary to have a sensitive temperature measurement in order to derive meaningful information. Accordingly, a continuous and sensitive measurement of gas pressure inside the milling container is carried out to measure very quickly and detect small temperature changes. The measured gas pressure includes not only information about the temperature increase due to friction, impact forces, and phase transformations, but also the interaction of gases with the fresh surfaces formed during the milling operation (adsorption and desorption of gases). The continual and highly sensitive measurement of the gas pressure within the milling container facilitates detection of abrupt and minute changes in the reactions occurring inside the vial. The pressure could be measured in the range of 0-700 kPa, with a resolution of 0.175 kPa, which translates to a temperature resolution of 0.025 K.

Bachin et al carried out MA of dispersion-strengthened, nickel-base superalloys in a centrifugal planetary ball mill. The mechanics of this mill are characterized by the rotational speed of the plate p, that of the container relative to the plate v, the mass of the charge, the size of the ball, the ball to powder ratio and the radius of the container. A schematic of the planetary ball mill is shown in Fig.2.4. Figure 2.5 shows a laboratory planetary mill.

diameters (0.5 to 2.5 m) to achieve high energy by rotating it just below the critical speeds c (up to 0.9 c ). Even though the time required to accomplish MA by these mills is longer compared to attritor mills, the overall economics are favourable.

As far as the grinding media are concerned, common practice is to use hardened high carbon-high chromium steel balls (4 to 12 mm diameter), normally specified for ball bearings. Stainless steel balls have also been used. When it is necessary to minimize iron contamination in the charge, balls of tungsten carbide have also been used. When necessary, the balls have been coated with the necessary oxide that was to be dispersed in the composition to be mechanically alloyed.

planetary mills

planetary mills

Planetary Mills are ideally suited for fine grinding of hard, medium-hard, soft, brittle, tough and moist materials. The comminution of the material to be ground takes place primarily through the high-energy impact of grinding balls in rotating grinding bowls.The grinding can be performed dry, in suspension or in inert gas. In addition to comminution, you can use Planetary Mills for mixing and homogenising of emulsions and pastes or for mechanical alloying and activation in materials research.

emax - high energy ball mill - retsch

emax - high energy ball mill - retsch

alloys, bones, carbon fibres, catalysts, cellulose, cement clinker, ceramics, chemical products, clay minerals, coal, coke, concrete, fibres, glass, gypsum, iron ore, kaolin, limestone, metal oxides, minerals, ores, paper, pigments, plant materials, polymers, quartz, semi-precious stones, sewage sludge, slag, soils, tea, tobacco, waste samples, wood, ... continue to application database

The greatest challenge when developing a high energy ball mill is keeping the temperature under control as the enormous size reduction energy leads to considerable heat built-up inside the grinding jar. RETSCH solved this problem with an innovative integrated water cooling system. Hence, the Emax usually doesnt require cooling breaks which are typical for long-term processes in conventional ball mills, even at low speed. In the Emax the cooling system cools the grinding jars via the jar brackets. This is very effective because heat is more easily discharged into water than into air. The user can choose between 3 cooling modes: in addition to the internal cooling, the mill can be connected to a chiller or the tap to further reduce the temperature.

The High Energy Ball Mill Emax combines high-frequency impact, intensive friction, and controlled circular jar movements to a unique and highly effective size reduction mechanism. The grinding jars have an oval shape and are mounted on two discs respectively which move the jars on a circular course without changing their orientation. The interplay of jar geometry and movement causes strong friction between the grinding balls, sample material and jar walls as well as a rapid acceleration which lets the balls impact with great force on the sample at the rounded ends of the jars. This significantly improves the mixing of the particles resulting in smaller grind sizes and a narrower particle size distribution than is possible to achieve in ball mills.

high energy ball mills instead of planetary ball mills

high energy ball mills instead of planetary ball mills

Grinding materials to a nano-scale is an important aspect of quality control and R&D. AZoM speaks to Dr. Tanja Butt from RETSCH GmbH about the benefits of using High Energy Ball Mills instead of Planetary Ball Mills.

In laboratories worldwide, Planetary Ball Mills are frequently used, for both, quality control and R&D. They have a reputation to be the best mills to grind semi-hard to brittle samples to very fine particles in the nanometer range < 100 m, always depending on the samples properties. However, such grinding processes can easily take several hours, again, depending on the sample material. With increasing speed, which means also increasing energy input, the chance to obtain actual nano-sized particles increases, but also the risk of warming and rising pressure inside the grinding jars. A practical solution to avoid that problem especially for temperature-sensitive materials - is to interrupt the grinding process and work with cool down breaks. This, however, increases the total process time usually by factor 2-4. Furthermore, the energy input of Planetary Ball Mills is limited, again due to the warming effects and forces inside the machines. Consequently, not all materials can be ground to nanometer size. To offer a solution, RETSCH developed the High Energy Ball Mill Emax which is able to grind many different substances to particle sizes < 100 m and usually in a much shorter time than required by other ball mills. Ideally, the grinding breaks can be skipped altogether, which results in enormous time savings.

The Emax is an entirely new type of ball mill for high energy milling. The unique combination of high friction and impact results in extremely fine particles within a very short process time. The high energy input is a result of the extreme speed of 2000 min-1 and the optimized jar design. Thanks to the revolutionary cooling system with water, the high energy input is effectively used for the grinding process without overheating the sample. Due to the special grinding jar geometry in combination with the circular movement of the jar with fixed orientation - the sample is thoroughly mixed which results in a narrow particle size distribution. The grinding jar supports are mounted on two discs respectively which turn in the same direction. As a result, the jars move on a circular course without changing their orientation. The interplay of jar geometry and movement causes strong friction between grinding balls, sample material and jar walls as well as a rapid acceleration which lets the balls impact with great force on the sample at the rounded ends of the jars. This significantly improves the mixing of the particles resulting in smaller grind sizes and a narrower particle size distribution than has been possible to achieve in ball mills so far. The time required to obtain a specific particle size is often less than in a Planetary Ball Mill, even in processes where no interruption in the grinding times are required in Planetary Ball Mills, thanks to the more efficient grinding mechanism.

The greatest challenge when developing a high energy ball mill is keeping the temperature under control as the enormous size reduction energy leads to considerable heat built-up inside the grinding jar. RETSCH solved this problem with an innovative integrated water cooling system. Hence, the Emax usually doesnt require cooling breaks which are typical for long-term processes in conventional ball mills, even at low speed. This dramatically reduces the grinding time. The cooling system cools the grinding jars via the jar brackets. This is very effective because heat is more easily discharged into water than into air. The user can choose between 3 cooling modes: in addition to the internal cooling, the mill can be connected to a chiller or the tap to further reduce the temperature. For temperature-sensitive samples, the Emax has a great benefit over Planetary Ball Mills. The software allows the user to carry out the grinding process within a defined temperature range, i. e. it is possible to define a minimum and a maximum temperature. On reaching the maximum temperature, the mill automatically interrupts the grinding process and resumes it when the jar has cooled down to the minimum temperature.

When using conventional ball mills the adequate cycles of grinding and cooling need to be ascertained by empirical trials. This may lead to degeneration of the sample or to unnecessarily long processing times. The Emax, in contrast, allows for variable cycles of grinding and cooling within the defined temperature limits. Thus, the entire size reduction process remains reproducible and is carried out in the shortest possible time.

The final size of a certain material always depends on the samples chemical and physical properties. Hard and brittle samples like quartz or some types of pigments can truly be ground to a nanometer size which means D90 < 100 nm! For example, barium titanate or titanium dioxide can be pulverized to D90 < 90 nm. Other, more difficult materials, like the lubricant graphite, can be ground to smaller sizes (D90 = 2.8 m) than in a Planetary Ball Mill. In principle, the Emax reaches final sizes similar to or better than those which are obtained in Planetary Ball Mills.

Special focus was placed on operating convenience and safety when developing the Emax. The grinding jar lids with integrated safety closure, which are simply screwed onto the jars, ensure absolute tightness for wet grinding processes or in cases of pressure increase inside the jar. The grinding jars are quickly and easily placed in the mill and are safely clamped with the ergonomic hand wheel. A sensor monitors the correct position of the jars before starting the machine. Possible imbalances are permanently monitored; if they become too strong the mill stops automatically and the remaining grinding time is displayed. Grinding parameters such as speed, time, interval operation or temperature control are quickly and conveniently set via the color touchscreen. The temperature is displayed during the entire grinding process. The user can store up to 10 grinding programs for routine operations.

Yes, definitely! A huge application field for the Emax is mechanical alloying mainly for R&D. For materials which cannot be alloyed by fusion, mechanical alloying is carried out in ball mills which provide high energy input through impact and friction. Trials have shown that the alloying process in the Emax takes considerably less time than in, for example, a Planetary Ball Mill. Further advantages include a better transformation rate as well as less amorphous particles and less caking of sample material in the jar.

A wide selection of accessories makes the High Energy Ball Mill a versatile instrument.There are grinding jars of three different materials stainless steel, zirconium oxide and tungsten carbide - ensuring contamination-free sample preparation. The first two materials are available in 50 ml jars and in 125 ml jars, tungsten carbide is available 50 ml jar. RETSCH offers a special aeration cover for the grinding jars designed for applications where a special atmosphere is to be maintained in the jar. The grinding balls are available in stainless steel, tungsten carbide and zirconium oxide. Sizes range from 0.1 mm to 15 mm, depending on the material. By selecting the adequate ball numbers and sizes, a wealth of applications can be covered. By continuously measuring pressure and temperature the processes and reactions which take place inside the grinding jar during grinding can be monitored and recorded.

The Emax is not a Planetary Ball Mill it is much more. Higher speed, less warming, finer particles, faster grinding procedures. The high energy input in combination with the unique cooling system provides perfect conditions for effective mechanical alloying or grinding down to the nanometer range. To sum it up, the Emax is faster - finer -cooler!

With more than 100 years of experience RETSCH is the leading solution provider for size reduction and particle sizing technology worldwide. Our philosophy is based on customer orientation and leading-edge technology. This is reflected in instruments whose high-quality components are designed for perfect interaction. Our products not only guarantee representative and reproducible results for size reduction and particle analysis but also allow for easy and comfortable operation. With RETSCH you get: First class product quality thanks to advanced manufacturing methods; Comprehensive application support including free test grindings and product trainings; Excellent sales and service network throughout the world.

The RETSCH website www.retsch.com provides all the details, including a product video of the Emax and an application database. We can also be found at many different trade shows all around the world or people may visit one of our end-user workshops or seminars. To keep our customers up to date with the latest dates and news, we send out a newsletter on a regular basis.

Dr. Tanja Butt studied Biology at the University of Duesseldorf, Germany, and graduated with a Diploma in Biology. After that she earned her PhD in biotechnology at the Forschungszentrum Juelich, Germany. Later, she worked in R&D and project management for different institutions. She joined Retsch in 2013 as Product Manager for the whole milling and sieving product range.

Disclaimer: The views expressed here are those of the interviewee and do not necessarily represent the views of AZoM.com Limited (T/A) AZoNetwork, the owner and operator of this website. This disclaimer forms part of the Terms and Conditions of use of this website.

RETSCH GmbH. (2019, October 30). Nano-Range Grinding with High Energy Ball Mills Instead of Planetary Ball Mills. AZoM. Retrieved on July 07, 2021 from https://www.azom.com/article.aspx?ArticleID=15254.

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planetary ball mill pm 100 - retsch - highest fineness

planetary ball mill pm 100 - retsch - highest fineness

Planetary Ball Mills are used wherever the highest degree of fineness is required. In addition to well-proven mixing and size reduction processes, these mills also meet all technical requirements for colloidal grinding and provide the energy input necessary for mechanical alloying. The extremely high centrifugal forces of a planetary ball mill result in very high pulverization energy and therefore short grinding times.The PM 100 is a convenient benchtop model with 1 grinding station. You may also be interested in the High Energy Ball Mill Emax, an entirely new type of mill for high energy input. The unique combination of high friction and impact results in extremely fine particles within the shortest amount of time.

alloys, bentonite, bones, carbon fibres, catalysts, cellulose, cement clinker, ceramics, charcoal, chemical products, clay minerals, coal, coke, compost, concrete, electronic scrap, fibres, glass, gypsum, hair, hydroxyapatite, iron ore, kaolin, limestone, metal oxides, minerals, ores, paints and lacquers, paper, pigments, plant materials, polymers, quartz, seeds, semi-precious stones, sewage sludge, slag, soils, tissue, tobacco, waste samples, wood, ...continue to application database

The grinding jar is arranged eccentrically on the sun wheel of the planetary ball mill. The direction of movement of the sun wheel is opposite to that of the grinding jars in the ratio 1:-2.The grinding balls in the grinding jars are subjected to superimposed rotational movements, the so-called Coriolis forces. The difference in speeds between the balls and grinding jars produces an interaction between frictional and impact forces, which releases high dynamic energies. The interplay between these forces produces the high and very effective degree of size reduction of the planetary ball mill.Planetary mills with a single grinding station require a counterweight for balancing purposes. In the Ball Mill PM 100 this counterweight can be adjusted on an inclined guide rail. In this way the different heights of the centers of gravity of differently-sized grinding jars can be compensated in order to avoid disturbing oscillations of the machine.Any remaining vibrations are compensated by feet with some free movement (Free-Force Compensation Sockets). This innovative FFCS technology is based on the dAlembert principle and allows very small circular movements of the machine housing that result in an automatic mass compensation. The laboratory bench is only subjected to minimal frictional forces generated in the feet.In this way the PM 100 ensures a quiet and safe operation with maximum compensation of vibrations even with the largest pulverization forces inside the grinding jars and therefore can be left on the bench unsupervised.

high energy ball mill | laval lab

high energy ball mill | laval lab

The High Energy Planetary Ball Mill Pulverisette 5 PREMIUM with 2 working stations is the ideal mill for fast, wet or dry, grinding of larger sample quantities down to the nanometer range, with the highest safety standards.

Due to the extra strong 2.2 kW drive power, the Pulverisette 5 Premium can reach a centrifugal acceleration of up to 62 g, with 800 rpm speed (rotational speed of the bowl 1,600 rpm). This results in high-performance grindings, down into the nanometric range, with a unique capacity of up to 450 mL.

With the completely brand new ServoLOCK clamping of the grinding bowls and the automatic check of the fastening of the bowls inside the mill, the operator and the machine are optimally protected. In the event of impermissible operating states, the machine blocks the start of a grinding and if an imbalance occurs, it automatically shuts off.

The revolutionary ServoLOCK is activated with a single hand motion by pressing down the clamp. The actual clamping is motor-driven by the mill. The advantage: each grinding always has the same conditions, with no screwing or manual fastening.

Via RFID chip the Pulverisette 5 Premium will not start until both bowls are correctly inserted. It also prevents setting too high speeds for the bowl material used. The results are constant and reliable; an incorrect operation is not possible.

To achieve the best grinding results, and for direct prevention of contamination of the samples due to undesired abrasion, grinding bowls and balls are available in different materials. For grinding in inert gas or for mechanical activation and alloying, premium line gassing lids with valves are available.

Maximum feed size: 10 mm Final fineness: < 100 nanometers Maximum capacity: 2 x 225 mL Grinding materials: Agate, zirconium oxide, hardened stainless steel, tungsten carbide Dimensions (WxDxH): Bench top instrument 8252 x48 cm (32x21x19) Weight: 110 kg (242 lb.) Certified safety (CE mark) optional CSA approval for Canada 2-year warranty

The comminution takes place primarily through the high-energy impact of grinding balls and partially through friction between the grinding balls and the grinding bowl wall. To achieve this, the grinding bowl containing the material to be ground and the grinding balls, rotates around its own axis on a main disk that is rotating in the opposite direction. At a certain speed, the centrifugal force causes the ground sample material and grinding balls to bounce off the inner wall of the grinding bowl, cross the bowl diagonally at an extremely high speed, and impact the material to be ground on the opposite wall of the bowl. The grinding bowls reach twice the speed of the main disk during this process (up to 1,600 rpm).

The comminution takes place primarily through the high-energy impact of grinding balls and partially through friction between the grinding balls and the grinding bowl wall. To achieve this, the grinding bowl containing the material to be ground and the grinding balls, rotates around its own axis on a main disk that is rotating in the opposite direction.

At a certain speed, the centrifugal force causes the ground sample material and grinding balls to bounce off the inner wall of the grinding bowl, cross the bowl diagonally at an extremely high speed, and impact the material to be ground on the opposite wall of the bowl. The grinding bowls reach twice the speed of the main disk during this process (up to 1,600 rpm).

The Planetary Mono Mill Pulverisette 6 is recommended for extremely rapid, batch grinding of hard to soft material, dry or in suspension, down to colloidal fineness. It is also an ideal laboratory instrument for mixing and homogenising of emulsions.

The Automatic Mortar Grinder Pulverisette 2 is ideal for universal grinding of medium-hard-brittle to soft-brittle materials (dry or in suspension) to analytical fineness, as well as for formulation and homogenisation of pastes and creams at laboratory scale.

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