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mineral wet grinding vs dry grinding

talc - netzsch grinding & dispersing

talc - netzsch grinding & dispersing

The matt white lustrous mineral talc (magnesium silicate hydroxide) with the chemical composition [Mg3(OH)2(Si2O5)2] is one of the phyllosilicates and has a Mohs hardness of 1. Talc has many varied applications and is used, for example, as a finely-ground filler in the paper and pulp industry, the paint and dye industry as well as the rubber, plastics and ceramics industries. The mineral is even used in the pharmaceutical industry, for example as a base for powder or as a mold-release agent in the manufacture of tablets. Its high temperature resistance makes talc an important component of fireproof materials such as ceramics. Additional applications for talc can be found in such fields as electrical engineering as an insulation material or in food technology as a releasing agent and as a carrier substance for dyes.

NETZSCH is expanding its product portfolio with an agitator bead mill for the dry grinding of mineral and ceramic raw materials. The Pamir impresses with very high product fineness and high throughput rates with low specific energy consumption.

Successful dispersion requires targeted force in order to separate agglomerated particles. The Nile Economic Disperser applies dispersive forces then and there, where they are especially effective: in the Nile disperser body, energy is transformed into very high speeds under pressure.

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wet grinding vs dry ball mill grinding

wet grinding vs dry ball mill grinding

Capacities and efficiencies in wet and dry ball milling at different speeds and ore charges have been discussed in the foregoing pages. The results are summarized in table 16, which shows that in both capacity and efficiency grinding was at its best with small ore charges and high speed. Likewise, in wet grinding the capacity was best with a small ore charge at high speed, but the efficiency was best with a large ore charge at slow speed. The numerical values inserted in the table are about 25 percent higher for wet grinding than for dry grinding. The values for capacity are more significant than those for efficiency. In considering efficiency values, it must be recognized that at a given speed and ore charge either the wet or dry grinding might not have been at its best. That is, it is not correct rigorously to compare the efficiency of wet and dry grinding without giving the mill the correct setting for each job.

The study of characteristics given in table 16 may be carried farther in figures 1 and 2. The upper part of figure 1 shows that in dry grinding, capacity and efficiency were best with a moderate ore charge; hence, a large discharge is required. In wet grinding, also, capacity was best with a moderate ore charge, but a large ore charge was required for efficiency. The lower part of figure 1 shows that in wet grinding the power decreased with increased amount of ore charge but in dry grinding the power increased.

In figure 2, in which the speed varied, of course the capacities increased with speed. The efficiencies changed only moderately. As said before. the efficiency in dry grinding was a little better at high speed.

The power curves at the bottom of figure 2 are typical of what has been shown before about power curves. The break of the power curve in dry grinding could have been predicted without completing the test at high speed; the relatively high powers in dry grinding at 40, 50, and 60 percent speeds gave evidence of the excellent keying, which caused the balls to be thrown high. Hence, they reached the 8-oclock position at a lower speed than in wet grinding. In dry grinding the balls reached the 8-oclock position at 80 percent speed and thereafter the power dropped

The results shown in table 18 are from continuous open-circuit work done to compare wet and dry grinding. First, it must be said that by choice the grinding was more intense than in former work only 0.171 and 0.132 ton per horsepower-hour, wet and dry, respectively, whereas in much of the earlier grinding of dolomite it was about 0.60 ton per horsepower-hour. The small tonnage treated per unit of power accounts for the large amount of the subsieve sizes. The feeds were adjusted for the close correlation of the minus 200-mesh sizes and the feed rates determined. Only a slight difference is shown between the type of the wet and dry grinds; the selective grinding was a little better in the dry work. The difference is in accord with the right side of table 17, where a small ore charge received the better selective grinding when the feed was dry. The ore charge in the tests shown in table 18 would probably be small because the mill, which was 19 inches in diameter, had an 8-inch discharge. Wet grinding gave 39 percent, more capacity and 26 percent more efficiency than dry grinding. These values supplement those shown in table 16.

Table 17 is compiled from tables 13 and 14, the object being to facilitate a ready comparison of types of grind in the wet and dry work. The conclusions to be drawn are not in harmony with some of those in the literature where experimental evidence was too scanty to justify the broad statements that were made. Such statements have prompted the compilation now to be discussed.

The sizing analyses of wet grinding at 50 percent speed in table 13 have been brought together with those of dry grinding in table 14 at that same speed. The upper part of the table is for chert and the lower part for dolomite. Throughout the table it holds true that with the heavy ore charge the coarse particles were reduced more in wet than in dry grinding. The reverse is true when the ore charge is light. Midway, that is at about 75 pounds of ore, the degree of selective grinding was about the same. With that charge, closed-circuit work would be expected to develop the same type of circulating load, whether wet or dry.

In wet grinding the heavy ore charge in the mill would give a closed-circuit product with the minimum amount of coarse particles, but in grinding the advantage would be in favor of the small ore charge. Hence, it is seen that the writer who said that the median diameter of the circulating load is larger when grinding wet than when grinding dry did not realize that the median diameter might depend on the amount of ore in the mill.

a comparative study on the effects of dry and wet grinding on mineral flotation separationa review - sciencedirect

a comparative study on the effects of dry and wet grinding on mineral flotation separationa review - sciencedirect

Water scarcity dictates to limit the use of water in ore processing plants particularly in arid regions. Since wet grinding is the most common method for particle size reduction and mineral liberation, there is a lack of understanding about the effects of dry grinding on downstream separation processes such as flotation. This manuscript compiles various effects of dry grinding on flotation and compares them with wet grinding. Dry grinding consumes higher energy and produces wider particle size distributions compared with wet grinding. It significantly decreases the rate of media consumption and liner wear; thus, the contamination of pulp for flotation separation is lower after dry grinding. Surface roughness, particle agglomeration, and surface oxidation are higher in dry grinding than wet grinding, which all these effects on the flotation process. Moreover, dry ground samples in the pulp phase correlate with higher Eh and dissolved oxygen concentration. Therefore, dry grinding can alter the floatability of minerals. This review thoroughly assesses various approaches for flotation separation of different minerals, which have been drily ground, and provides perspectives for further future investigations.

As an associate professor at the Lulea University of Technology, Prof. Chelgani developed various investigations in process modeling, flotation, leaching and coal processing. Since 2016, he has been an editorial board member of various journals Minerals, Materials, etc. and certified as an outstanding journal reviewer by various journals. He was adjunct prof. at University of Michigan between 2015 till 2018. He has been in several industrial and academia project and outcomes of those projects have been successfully published in high ranked journals (more than 90 articles and h-index: 25). Moreover, he has been awarded the most prestigious scholarships in Canada, and USA (OGS, NSERC, and outstanding researcher).

wet grinder vs dry grinder, what are the advantages?

wet grinder vs dry grinder, what are the advantages?

Its amazing how many products in our daily lives have gone through the grinding (or milling) process. From breakfast cereal to cold medicine to paint to cement, grinding is a key step to getting essential products to market in their correct form.

There are challenges and advantages of wet grinding and dry grinding, the two most common and effective grinding methods. In this article, well break them down as well as discuss some examples of each.

The terms grinding and milling are really interchangeable. If you know a piece of equipment called a jet mill is used, you may regularly refer to the process as milling. Others who may not be as familiar with the process or the equipment, may use grinding as a general way to describe it. Dont get caught up; there are no differences between the two.

So, what is micronization within particle technology? That term is somewhat more specific, typically referring to particle reduction in the sub-10 micron size range. So, all micronizing is grinding, but not all grinding gets down to the micronizing particle level.

Speaking of microns, what is nanometer level particle reduction? Nano refers to sizes less than 1 micron, which is equal to 1,000 nanometers. The average nano size in particle reduction is approximately 200-500 nanometers. More on this later.

The terms wet and dry grinding are overarching words that basically describe each of those two processes. Although the goals are the same make large particles smaller the processes are different. In general, dry grinding uses particle-on-particle contact to reduce size, while wet grinding involves dispersing the material in a liquid and using solid, grinding media to reduce size.

Dry grinding is a relatively simple process. Within any number of specialized machines, material travels within a contained area and impacts other particles or rotors until it breaks into a desired size. During wet grinding, particles dispersed in the liquid slurry are crushed by the grinding media.

Dry grinding, in a jet mill for instance, uses a single pass process; material goes in and is expelled once. Wet grinding is a recirculation process, with the slurry exposed to the grinding media over and over, for hours if necessary, until the desired particle size is achieved.

Although the grinding methods are different for each, one challenge is common to both dry grinding and wet grinding: the potential for wear on the grinding equipment thats used to break down the material, or materials construction.

In dry grinding, there may be abrasives within the material that could, over time, damage the equipment. Wet grindings carrier fluid, or the material itself, must be chemically compatible; water, oil, surfactants, solvents can eat away at the equipments grinding media or parts used to agitate that media.

Target particle size is always the next consideration. In general, dry grinding gets particles down to single digit micron size. Wet grinding regularly reduces particles down to the nanometer range. While dry grindings simplicity often makes it the first method considered, if extremely small size is the goal, wet is the only way to get there.

If wet grinding is used to reduce particles to 500 nanometers, like above, but that product is NOT going to be used in a liquid base, it requires drying. Shipping a slurry thats 75% water only to remove that water via a spray drier adds significant freight and handling expenses.

If application, size, and cost dont lock a project into dry grinding or wet grinding, it may come down to simple capacity. Can one grinding method (and equipment) better handle the required particle size in the quantities needed?

The need to formulate for dry or wet grinding may come into play. Obviously, its most efficient to include as much particle solid into the mix as possible. However, there may be need for additional additives, which can be determined based on past experience and trials.

Experienced providers of wet and dry grinding have quality assurance processes in-house, including analytical lab testing capabilities. While this may not determine one method over the other, its important to have these services available to ensure a quality end product.

Get your own introduction to expert guidance when you download our Grinding Project Application Checklist. Its enough to get you started considering your needs and project scope, specifications, and other details than can impact processes and outcomes. Just click the link below to access and download your own copy, to reference whenever you need or share with colleagues.

Get your own introduction to expert guidance when you download our Grinding Project Application Checklist. Its enough to get you started considering your needs and project scope, specifications, and other details than can impact processes and outcomes. Just click the link below to access and download your own copy, to reference whenever you need or share with colleagues.

wet ball milling vs dry ball milling | orbis machinery, llc

wet ball milling vs dry ball milling | orbis machinery, llc

Everything we make use of in our day to day activities passes through a milling process. Cement used in building, the cereals we eat, toiletries, paints used in making our house presentable, and the tiles that beautifies the house we live in, all went through a milling process. A ball mill is a grinder which is used to grind, blend and mix materials like chemicals, ores, pyrotechnics, paints, mineral dressing process, paint and ceramic raw materials. Its working principle is impact and attrition. Ball milling have proved to be effective in increasing solid-state chemical reactivity and production of amorphous materials. Milling operations are carried out either wet or dry.

Power The difference between the result gotten from using wet and dry milling are most of the time very large. This difference is attributed to the power. The power to drive a wet ball mill is said to be 30% lesser than that of a similar dry ball mill.

Nature Of Materials In the production of some products both wet ball and dry ball milling processes are required. The grinding of the raw mix in a cement plant, can be carried out either wet or dry but because of the nature of the cement can, grinding it has to be carried out dry.

Quality The quality expected will be the determinant of which ball milling process to be used. For example, if pyrotechnic materials is grounded dry, it gives a product superior characteristics compared to the one which was grounded wet. The grinding of aluminium for the preparation of paint is most of the time carried out using a wet milling process since the method introduces stearic acid, or other antiflocculent

Environment The advantages Wet ball milling has over dry milling are higher energy efficiency, lower magnitude of excess enthalpy, better heat dissipation and absence of dust formation because of the aqueous environment it is being performed.

Introduction Of Active Surface Media Wet ball milling allows easy introduction of surface active media having to do with the reduction of the required energy for the inhibition of aggregation of fine particles. Due to wide adoption, it is only theoretically possible to introduce such material or substance in gaseous or vapour form into dry ball milling. The only practicable method of introducing substance in gaseous form is wet ball milling.

Cost In the production of ethanol, wet ball milling is the process used, because of its versatile process. It produces more products than dry ball milling, but in terms of efficiency, capital, and operating cost, most ethanol plants in the USA prefer to use dry ball milling process. In other words, dry ball milling is cost efficient in ethanol production than wet ball milling. With the above, you should be able to weigh which of the ball milling process is appropriate and cost efficient for your production needs.

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