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ore separating iron ore spiral classifier

screw classifiers,spiral classifier,spiral concentrator,ore spiral classifier - hxjq mining machine manufacturer

screw classifiers,spiral classifier,spiral concentrator,ore spiral classifier - hxjq mining machine manufacturer

Hongxing's screw classifiers are designed to provide the most effective pool area and overflow velocity requirements. Our spiral classifier is widely used in the distribution of ore in closed circuits with ball mills, grading ore and fine slit in gravity mills, grading granularity and flow of metal ore-dressing, and de-sliming and dehydrating in washing.

Spiral classifieris made of U-steel, while the body is armor plated and the spiral axle is made of cast iron for durability. The machine's lifting equipment can be used manually or electronically. Spiral classifier consists of transmission part, spiral axis, tank, elevator mechanism, bearing, discharge valve. Spiral classifier is with simple structure, reliable working conditions and convenient operation.

China screw classifier can filter materials and send coarse materials towards the feeding mouth and discharge fine materials from your pipe. The machines lifting equipment can be utilized manually or electronically. Spiral classifier price produced by our company is reasonable. For this reason, we have large domestic and overseas market.

Combined with ball mill to form closed loop procedure, ore spiral classifier is widely applied in the ore beneficiation plant or gravity spiral classifier plant to separate mineral sand or fine sand. In addition, spiral concentrator is also applied in the metal ore beneficiation procedure to separate the ore pulp as well as desliming or dehydration operation in the ore washing process. Ore spiral classifier has the features of simple structure, reliable working and convenient operation and the like.

screw classifiers

screw classifiers

To be successful in a obtaining a uniform grind that is necessary to achieve a high percentage of recovery it is necessary to control the degree of fineness that the ore is reduced to. This is done by separating the fine material from the course and regrinding the coarse until it is fine enough for efficient mineral extraction.

To be able to obtain the necessary control over the amount of grinding required, a method of effective classification and separation by size must be available. For maximum effectiveness it should take place after every stage of grinding.

The types of equipment that are used to accomplish this are called CLASSIFIERS. There are three basic kinds used. The first two, the RAKE classifier and the SPIRAL or screw classifier work on the same principal, and are not often used any more. These two types were popular for many years. It wasnt until the development of the CYCLONE type classifier that their popularity faded. You may still find a few though, in the older mills and the mills that require a classification of the larger ore sizes that the cyclones are not very good at sizing. Both the rake and spiral classifiers take advantage of the natural settling characteristics of ore. Any time that slurry is allowed to flow over a surface the tendency of the ore is to graduate itself into layers of different sized material. The larger sizes will be on the bottom, these are also the ones that are the slowest moving. As you come closer to the surface, the material will become smaller and faster until the very finest and the easiest to wash away is on top.

To understand how these two classifiers make use of this settling action, a description of them is required. First, to have the classification happen, the slurry must be able to flow. This means the classifiers must be inclined. The working portion of these two classifiers are the RAKES or SPIRAL/screw which are placed into the flow of ore. To separate the course material from the fine, the rakes and spiral make use of the same theory, but differ in its application. The theory is, as the slurry flows down the inclined bed of the classifier it will separate into different sizing. The larger ore that is on the bottom will not be flowing as fast as the light ore on top.

To separate the two, the rakes and the spiral will pull the all of the slurry back up the incline, then, let it go to flow back down towards the underflow or in this case the fine ore discharge point. The smaller, faster ore will be able to travel a longer distance than the large particles before the rakes or spiral will pull the ground material back towards the coarse ore discharge. If the Classifier is able to pull the course ore backwards further than it can travel forwards, then eventually the bigger particles will be pulled all the way to the top of the incline where they will be discharged. The smaller faster pieces of ground rock will end up at the bottom of the incline to be discharged as fine material that is ready for the next stage of processing.

This type of classifier will do away with the necessity of pumps. The length of the incline that is needed is long and steep enough to have the material lifted to the feed end of the mill. The flow of the finer ore will run down hill to the next piece of equipment. The concentrator that used this type of classification was built on the side of a hill to make use of gravity to get the material from one stage of production to the next. It was because of this that this type of concentrator was referred to as a GRAVITY FLOW/MILL. I used the past tense in this paragraph because this design of mill is no longer in use.

I want to know what is the range of the % Solids content in overflow from screw/spiral classifier in Hematite Iron ore washing for efficient operation of classifier. I also want to know what is Auto dilution in thickener. Does Auto dilution has any effect on Pumping capacity of clarified water from thickener.

Each operation is different, but the good news is that you can simply determine the solids % wt. in the SOF, try 2 -3 times daily over one week, get a profile. If below 5% wt., you may not need auto dilution, also depending on ore and grind size. This is almost a clarifier regime, often workable without rakes in certain units. Above 5% in general start looking at auto-dilution before adding the flocculant do this off-line. Make sure that the thickener underflow (TUF) discharge comes out continuously, otherwise you may need to play with the lifters, if you have them. The UF solids % wt. must be correlated with the yield stress.look for 30 Pa high-end cut off value for lean operation. When the ore or grind size changes, you need to repeat the evaluation.

My take on these classifiers is that the clear water added to the classifier feed determines the size of the largest heaviest particle going to the overflow. This is the criteria that you should be working to achieve. As you probably have more than one classifier reporting to the thickener you will need to perform the solids percent in each overflow. As you add water to the classifier feed, the separation efficiency increases. You should be raising or lowering the discharge weir to attain the desired size cut. Only if the thickener becomes overloaded should you add water. Pumping excess water adds cost and wear to pump trains.

Pulp density of the Overflow defines % of solids in thickener. This solids% depends also up on quality of recycle water used in spiral processto know quantum of solids..you have to give feed quantity and underflow quantity.

The % solids in classifier overflow may vary in wide range, its all depends on your ore characterisation and operating variables. For the same operation we used to get 15-18% solids as my ore contains too much fines & this is not end process in our case.Try to concentrate on end products. Do not let go valuables in your final tailings.

spiral classifier for mineral processing

spiral classifier for mineral processing

In Mineral Processing, the SPIRAL Classifier on the other hand is rotated through the ore. It doesnt lift out of the slurry but is revolved through it. The direction of rotation causes the slurry to be pulled up the inclined bed of the classifier in much the same manner as the rakes do. As it is revolved in the slurry the spiral is constantly moving the coarse backwards the fine material will flow over the top and be travelling fast enough to be able to work its way downwards to escape. The Variables of these two types of classifiers are The ANGLE of the inclined bed, this is normally a fixed angle the operator will not be able to adjust it.

The SPEED of the rakes or spirals, the DENSITY of the slurry, the TONNAGE throughput and finally the SETTLING RATE of the ore itself.To be effective all of these variables must be balanced. If the incline is too steep the flow of slurry will be too fast for the rakes or spirals to separate the ore. If the angle is too flat the settling rate will be too high and the classifier will over load. The discharge rate will be lower than the feed rate, in this case. The load on the rakes will continue to build until the weight is greater than the rake or spiral mechanism is able to move. This will cause the classifier to stop and is known as being SANDED UP. If the speed of the rakes or spirals are too fast, too much will be pulled, out the top. This will increase the feed to the mill and result in an overload in either the mill or classifier as the circuit tries to process the increased CIRCULATING LOAD.

The DENSITY of the slurry is very important, too high the settling will be hampered by too many solids. Each particle will support each other preventing the heavier material from quickly reaching the bottom of the slurry. This will not allow a separation to take place quickly. The speed at which the slurry will be travelling will be slow and that will hamper effective classification. Another variable is the TONNAGE. All equipment has a limit on the throughput that anyone is able to process, classifiers are no different. This and the other factors will have to be adjusted to compensate for the last variable, the ore itself. Every ore type has a different rate of settling. To be effective each of the previous variables will have to be adjusted to conform to each ones settling characteristics.

The design of these classifiers (rake, spiral, screw) have inherent problems, First, they are very susceptible to wear, caused by the scrubbing action of the ore, that plus all of the mechanical moving parts create many worn areas to contend with. The other problem that these classifiers have is that they are easily overloaded. An overloaded classifier can quickly deteriorate into a sanded-up classifier. Once that happens the results are lost operating time, spillage and a period of poor Mineral Processing and Separation performance.

Another mechanical classifier is the spiral classifier. The spiral classifier such as the Akins classifier consists of a semi-cylindrical trough (a trough that is semicircular in cross-section) inclined to the horizontal. The trough is provided with a slow-rotating spiral conveyor and a liquid overflow at the lower end. The spiral conveyor moves the solids which settle to the bottom upward toward the top of the trough.

The slurry is fed continuously near the middle of the trough. The slurry feed rate is so adjusted that fines do not have time to settle and are carried out with the overflow .liquid. Heavy particles have time to settle, they settle to the bottom of the trough and the spiral conveyor moves the settled solids upward along the floor of the trough toward the top of the trough/the sand product discharge chute.

spiral classifier for iron ore, copper, zinc cleaning and processing | lzzg

spiral classifier for iron ore, copper, zinc cleaning and processing | lzzg

Ore spiral classifier application Spiral stone classifier is a large-scale mining equipment used in black and non-ferrous metallurgical mines, steel, metallurgy, chemical industry and building materials to wash ore and stone materials like iron ore sand, copper ore, gold sand, placer sand. Its processing capacity is large to meet the requirements of large productivity for the cleanliness of ore and stone. The ideal equipment. The iron ore spiral classifier performs mechanical classification according to the difference in the specific gravity of the solid particles and the rate of sedimentation in the liquid. It is suitable for washing, grading and impurity removal in metallurgy, building materials, hydropower, and other industries. The spiral classifier is suitable for the washing operation of granular and coarse-grained materials. Principle of mineral processing The spiral classifier uses the buoyancy of water to separate dust and impurities from the sand. After the agitation of the spiral piece, the water is filtered to remove impurities and enhance the conveying purpose. And during the lifting process, mixing work was also carried out. It is sanding to achieve even mixing, no fine, coarse sand. The spiral washing machine has the advantages of long spiral body, good sealing system, simple structure, strong processing capacity, and convenient maintenance. The characteristics of sand content and low mud content. Widely used in various ore mining industries. Machine structure It consists of a trough body, a reducer, a motor, a central shaft, a spiral blade, and a bracket. The bracket is welded on the central shaft, and the spiral blade is mounted and then pressed with bolts so that the blade does not sag and does not deform. Spiral ore classifier installation After the washing machine is shipped, the unit should immediately check whether the parts are complete and damaged. Make sure the machine is intact before installing it. The unit of use shall design the basic construction drawing of the spiral classifier according to the specific conditions of the site, and install the machine firmly on the solid concrete foundation. The machine must be installed at an oblique angle as required by the installation drawings. The motor is mounted on the guide rail to adjust the tightness of the belt. The pulley and the motor pulley should be parallel when installed. After adjusting according to the above requirements, turn the rotor disk a few turns to check for stuck or collision.

Spiral stone classifier is a large-scale mining equipment used in black and non-ferrous metallurgical mines, steel, metallurgy, chemical industry and building materials to wash ore and stone materials like iron ore sand, copper ore, gold sand, placer sand. Its processing capacity is large to meet the requirements of large productivity for the cleanliness of ore and stone. The ideal equipment.

The iron ore spiral classifier performs mechanical classification according to the difference in the specific gravity of the solid particles and the rate of sedimentation in the liquid. It is suitable for washing, grading and impurity removal in metallurgy, building materials, hydropower, and other industries. The spiral classifier is suitable for the washing operation of granular and coarse-grained materials.

The spiral classifier uses the buoyancy of water to separate dust and impurities from the sand. After the agitation of the spiral piece, the water is filtered to remove impurities and enhance the conveying purpose. And during the lifting process, mixing work was also carried out. It is sanding to achieve even mixing, no fine, coarse sand. The spiral washing machine has the advantages of long spiral body, good sealing system, simple structure, strong processing capacity, and convenient maintenance. The characteristics of sand content and low mud content. Widely used in various ore mining industries.

It consists of a trough body, a reducer, a motor, a central shaft, a spiral blade, and a bracket. The bracket is welded on the central shaft, and the spiral blade is mounted and then pressed with bolts so that the blade does not sag and does not deform.

After the washing machine is shipped, the unit should immediately check whether the parts are complete and damaged. Make sure the machine is intact before installing it. The unit of use shall design the basic construction drawing of the spiral classifier according to the specific conditions of the site, and install the machine firmly on the solid concrete foundation. The machine must be installed at an oblique angle as required by the installation drawings. The motor is mounted on the guide rail to adjust the tightness of the belt. The pulley and the motor pulley should be parallel when installed. After adjusting according to the above requirements, turn the rotor disk a few turns to check for stuck or collision.

Applycation of sand classifer Beneficiation The spiral classifier is one of the equipment for beneficiation. The spiral classifier is a machine for mechanical classification based on the principle that the specific gravity of solid particles is different, so the speed of precipitation in the liquid is different. The material and powder ground out of the mill can be filtered, and

The spiral classifier is used in the artificial sand production line and the commonly used classification equipment in the washing operation. It is mainly used to wash off the mud powder in the sand so that the artificial sand can reach the standard of construction sand. Some faults will inevitably occur during work and use. Here are some common fault

This project adopts self-developed new technologies, new processes and new equipment, and eliminates outdated technologies, processes, equipment and production capacity. The new type of pulping machine developed in this project is used for the dispersion of minerals in the process of raw material pulping, which is shorter than the original pulping time, and the separation of minerals and impurities is

Guidance on installation, operation and maintenance of spiral classifier Installation The screw classifier can be installed after inspection without damage or loose screws. The classifier should be firmly installed on the basis of the poured concrete. The basic design should have a good supporting effect and minimize the shear force on the screws. Operation The machine can only be operated

spiral classifiers | screw classifiers | dove

spiral classifiers | screw classifiers | dove

DOVE Spiral Classifier, also referred to as Screw Classifier, or Spiral Mineral Separator, is highly efficient classifier designed for closed circuit wet classification and separation of the Slimes (Fines) from a sandy sized (Coarse) material. It is well suited for classification, where a two product size-split is required. Due to inherent operational qualities, DOVE Spiral Classifier is ideally suited Sizing applications, Washing Applications, and Dewatering sand or crushed material from Hydro cyclone, or lower screen residues.

DOVE Coarse and Fine Spiral Classifiers are supplied in various capacities, tub lengths, screw sizes and technical specifications. We supply total of 16 models, where 10 models are configured with single screw and 6 models with dual screw.

Spiral Screw classifier is a type of common mechanical classifier, consists primarily of an inclined tub and a transport screw for the coarse material. The fine material residue is at the lower end of the tub and the coarse material residue is at the upper end. The principle of the operation and separation of solid grains is based on the law of gravity and concept that the solid particles are different in size and specific gravity, therefore the settling speed in the water is different. Fine ore particles float in the water and overflow, and respectively coarse ore particles settles to the bottom. As a guide line, a unit with longer length classifier will dewater the same material to a higher degree, and likewise a unit with a greater diameter of screw revolving the identical speed will produce higher capacity. In the application of dewatering fine material, the screw speed is reduced to allow proper classification and dewatering.

DOVE laboratory will assay your ore samples rapidly and analyze your raw materials and recommend the most efficient processing plant according to the ore specifications, minerals composition, and ore assay results, and your project size and the geologic and topographic conditions of your mine.

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