Scheelite dressing can use gravity, magnetic and flotation separation. The types and properties of the ore decide the separation methods and processes. Basing on good floatability of scheelite, the flotation is selected.
Concentration pulp with high temperature is common method. First, the pulp is concentrated to 60%-70%; the next, sodium silicate is added into pulp; then, the pulp is heated to 80℃ and stirred for 30-60min; the last, it is diluted with water. The floatation of scheelite is under the room temperature, and the product in tank is calcspar & fluorite.
It is difficult to separate scheelite and barite by sodium silicate because of the closed inhibitory action for scheelite and barite. We choose alkyl sulfate as collector to repeatly select barite under the 1.5-3PH, and the product in tank is scheelite.
Xanthate is used to capture sulfide minerals in scheelite floatation. We add a little oxide and sodium sulfide to inhibit sulfide without floatation.
Oleic acid as collector and sodium silicate as inhibitors could inhibit the quartz and silicate gangue and float scheelite.
A refractory scheelite in Hunan has a grade of 0.35% scheelite. Due to the complex mineral composition, fine-grained ore embedded, rich in fluorite and other calcium-rich and iron-rich minerals, the scheelite flotation index is greatly interfered. The beneficiation plant sorts the samples by flotation method, using one roughing, four beneficiation, and two sweeping processes. The final grade of scheelite concentrate is not high, about 55%, which is a serious waste of resources. After researching the properties of the ore, Xinhai adopts the centrifuge-flotation process, and the index is relatively ideal.
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