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.

china iron ore spiral chute, iron ore spiral chute manufacturers, suppliers, price

china iron ore spiral chute, iron ore spiral chute manufacturers, suppliers, price

China manufacturing industries are full of strong and consistent exporters. We are here to bring together China factories that supply manufacturing systems and machinery that are used by processing industries including but not limited to: spiral chute, spiral concentrator, mining equipment. Here we are going to show you some of the process equipments for sale that featured by our reliable suppliers and manufacturers, such as Iron Ore Spiral Chute. We will do everything we can just to keep every buyer updated with this highly competitive industry & factory and its latest trends. Whether you are for group or individual sourcing, we will provide you with the latest technology and the comprehensive data of Chinese suppliers like Iron Ore Spiral Chute factory list to enhance your sourcing performance in the business line of manufacturing & processing machinery.

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.

WE HIGHLY RECOMMEND FORWARDING SOIL SAMPLES OF YOUR MINE TO US FOR ANALYSIS, IN ORDER TO DESIGN AND RECOMMEND THE MOST EFFICIENT PROCESSING PLANT, TAILOR MAID TO YOUR MINE REQUIREMENTS, FOR HIGHEST PRODUCTION RECOVERY.

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