How to process the symbiosis of black and white tungsten ore?

In some wolframite deposits, there will be a small amount of scheelite. The existence of these scheelites will not affect the overall mineral processing process, but it is necessary to add the separation operation of black and white tungsten ores in the beneficiation section.

Black and white tungsten ores are both tungstates, but their cations are different, resulting in different floatability. The scheelite is easy to float, and the fatty acid collector can capture the scheelite, but the flotation performance of the wolframite is far worse than that of the scheelite.

The tungsten minerals in the black and white tungsten ore are fine-grained, and the composition of the gangue minerals is also relatively complex. Therefore, a relatively complex sorting process is required to process it.

1. Single re-selection process

The cost of re-selection is relatively low and causes less environmental pollution. When the specific gravity difference between the recovered minerals and the gangue minerals is large, the gravity separation process can be used. There is a large density difference between black and white tungsten ore and other gangue minerals. Gravity separation is generally used to separate it from the gangue minerals. It is especially suitable for ores with coarser grain sizes of wolframite and scheelite. The selection efficiency is higher.

The single gravity separation process is mainly used to process wolframite and scheelite, which are mainly medium and coarse-grained tungsten ores, and the raw ore contains less sulfide ore. If the sulfide mineral content is too much, the gravity separation effect will be seriously affected.

2. Coarse particle gravity separation-fine particle flotation process

If the tungsten minerals in the ore are unevenly distributed in thickness, gravity separation can be used to recover most of the tungsten metal, but the recovery effect of fine-grained tungsten metal is poor. The lower limit of particle size that can generally be recovered by gravity separation technology is 0.037mm. Materials smaller than this particle size are difficult to recover.

To address this problem, flotation can be used to make up for the shortcomings of gravity separation. The flotation process can effectively recover fine-grained tungsten metal in the ore. Therefore, the process of coarse-grained gravity separation and fine-grained flotation can be used for tungsten ore with uneven thickness. The gravity separation equipment used in this process includes spiral concentrator, spiral chute and shaking table, and the classification equipment uses hydrocyclone and high-frequency vibrating fine screen.

3. Combined process of gravity separation, flotation, magnetic separation and electric separation

If the mixed ore composition of wolframite and scheelite is complex, and the tungsten minerals in the ore are mainly distributed in medium and fine grains, and mainly fine grains, the rough separation process can use gravity separation to select the black and white tungsten minerals into the coarse separation process. In concentrate. When selecting, you can grade them first. The coarse-grained minerals obtained after classification are subjected to a combined beneficiation process of flotation-magnetic separation-electric separation to obtain black tungsten concentrate and scheelite concentrate. Fine-grained minerals use a combined process of scheelite flotation-magnetic separation-gravity separation to separate scheelite and wolframite.