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Wolframite ore beneficiation process flow

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The wolframite ore beneficiation process flow chart mainly includes five stages: roughing, grinding, gravity separation, concentration and fine mud treatment.

1. Rough separation of wolframite ore

The hand separation method is a simple pre-concentration method for wolframite ore, and it is also a necessary operation in the wolframite ore beneficiation process. Selecting qualified wolframite ore from raw ore is called forehand selection, and selecting waste rock from wolframite raw ore is called backhand selection. Depending on the properties of wolframite ore, wolframite ore concentrators can all adopt the process of front-hand selection or back-hand selection, or a combination of front-hand and back-hand selection.

2. Wolframite Ore Grinding

Because tungsten is brittle and has a large specific gravity, it is easy to be over-grinded and over-pulverized during the grinding process, resulting in excessive secondary sludge. Therefore, the grinding stage is particularly important in tungsten ore separation. The common grinding stages of wolframite ore mostly adopt processes such as one-stage grinding, one-stage rod mill + medium ore grinding, and two-stage grinding. At this stage, wolframite ore grinding equipment mostly uses rod mills. Firstly, it can avoid over-grinding. Secondly, it can ensure that the particle size of the ground products is relatively uniform and meet the particle size requirements for gravity selection.

3. Gravity separation of wolframite ore

In principle, the gravity separation stage of wolframite ore generally involves the raw ore grinding in the first to second stages, then entering the coarse concentrate for three-stage jigging, four- to five-stage shaking tables, and fine mud centralized treatment, and discarding a large amount of tailings; coarse and medium particles The jigged tailings are fed into the rod mill for re-grinding, and the ground products are returned to the double-layer vibrating screen, forming a closed loop. Shaking tables usually use two separations. The coarse and medium-grained shaking tables return the ore to the circulation loop, and the slime is processed separately.

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01. Blacktungsten ore jig selection

The jig is one of the important re-selection equipment in the black tungsten re-selection stage. The jigging and sorting process of wolframite ore mostly adopts three-stage jigging, that is, all qualified ores are screened into three levels: coarse, medium and fine for jigging operation, and the coarse and medium-sized jig tailings are reground and then selected. Its recovery rate can reach 65%-75%. The fine-grained jig tailings are hydraulically classified and then sent to the shaking table for sorting, and the tailings are discarded in the shaking table operation. The concentrate obtained from the roughing jig operation can be sent to the concentration operation as the coarse concentrate in the gravity separation section for processing.

02. Blacktungsten ore shaking table selection

Shaking tables are widely used in the separation of medium and fine-grained wolframite ores. They can be used as selection equipment in large-scale wolframite beneficiation plants and as coarse and selection equipment in small-scale wolframite beneficiation plants. The suitable selection particle size is 0.037 -2mm. In order to ensure the gravity separation effect of wolframite ore, the narrower the particle size range of each gravity separation operation, the better. In this regard, a high-frequency vibrating screen or hydraulic classification box can be used for pre-grading before the shaking table is fed to the ore. The wolframite shaker separation usually involves two operations. The ore in the coarse and medium shaker is returned to the circulation loop, and the sludge is processed separately.

4. Selection of wolframite ore

After gravity separation of wolframite ore, the coarse concentrate often contains high-value non-ferrous metals such as tin, molybdenum, bismuth, copper, zinc, etc., or rare metals such as tantalum and niobium. Therefore, it is necessary to process the tungsten coarse concentrate. Featured. 

01. Wolframite magnetic separation method

The wolframite coarse concentrate beneficiation operation is generally an intermittent operation, and the coarse concentrate needs to be dried before being selected. The magnetic separation of coarse-grained wolframite adopts a single-disk or multi-disc dry magnetic separator. This type of magnetic separator is a lower-end feeder with strong selectivity. The processing particle size is 0.074-3mm. After magnetic separation, a relatively pure tungsten concentrate can be obtained. ore, but the tailings contain high tungsten and require multiple sweeps. In addition, the materials fed to the disc magnetic separator need to be classified and selected. The narrower the particle size, the better the magnetic separation effect. 

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02. Black tungsten ore platform float method 

Taiwan flotation is an important separation method for black tungsten beneficiation, that is, gravity separation and flotation are performed simultaneously on the same shaker. In the coarse-grained state, the wolframite ore platform floatation method can achieve flotation separation of easily flotable sulfide and other minerals, and at the same time separate minerals with different specific gravity on the bed surface. This method combines the gravity separation method with the flotation method to obtain better separation effects, simplify the process flow, and improve production efficiency. At the same time, it can handle coarse-grained materials, save grinding costs, and avoid over-crushing of useful minerals.

5. Wolframite fine mud processing stage

In the wolframite fine mud treatment stage, desulfurization operations are first carried out, and then the tungsten mineral is processed using gravity separation, flotation, magnetic separation, electric separation and other separation processes or a combined separation process consisting of multiple processes according to the properties of the fine mud material. Recycling and comprehensive utilization of associated metal minerals.


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