How to upgrade scheelite? And what grade of tungsten can be improved to?

For scheelite tungsten ore, floatation separation is used very commonly due to its great floatability. Rough floatation separation and fine selection has been included in the floatation separation of scheelite. Rough floatation separation is to remove the waste to the largest extent with a good recovery while the fine selection is the key to get high grade scheelite tungsten concentrate.

The sulfide ore is usually mixed in the white ore bed with the molybdenite especially common. During the scheelite beneficiation, sulfide ore will be beneficiated by floatation separation, and then the Scheelite will be floated then. The floatation of Scheelite is done in alkaline medium. Na2CO3 and NaOH will be used to improve the Ph of the pulp to 9-10.5. Sodium silicate, quebracho juice, tannin, kinds of phosphate will work as inhibitor. oleic acid, sodium oleate, tall oil, oxidized paraffin wax soap will be used as collector with its own frothing capacity while most of them needs no blowing agent when working.
However, there are many scheelite tungsten mines with big coarse scheelite inlay size even over 5mm in Africa, and here gravity separation can be used to recover the coarse scheelite granules and this lowers the scheelite loss due to crushing or milling. If floatation separation is used directly for this coarse scheelite ore, the recovery rate will be lowered and this will be not so good as gravity separation. Here the scheelite tungsten gravity separator is scheelite jig separator. Gravity separation of jigging separator-shaking table is very common to use in the real operation.
Here Forui has been in tungsten beneficiation field for over 25 years and have many clients at home and abroad. Free trial can be done for you free if samples of 15-20kgs can be available. You are always welcome to visit Forui, and skype of ForuiMining can be available for 24 hours.
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