Gravitational Recycle of Tungsten Tailings from Flannelette Blanket Chute

Tungsten is nonferrous metal, the distribution of the crust is small, mainly in the state of tungstate and tungsten, the main tungsten minerals are wolframite (Fe, Wn) Wo₄ and scheelite CaWo₄, which are mostly vein deposits and their Wo₃ content is between 0.4 and 2%. Wo₃ reaches more than 65% and becomes tungsten concentrate before it can be used to smelt tungsten or extract compounds and metals.

After the ore dressing process, the ore is broken, sieved, grated and classified, and the gravity selection method is facilitated by the gravitational dressing method, because the proportion of wolframite is 7.1 ～ 7.9 and the cassiterite is 6.8 ~ 7. After gravity concentrating, the grade of ore concentrate with Wo3 60 ~ 70% is obtained, and the tailings after gravity concentration only contain Wo₃ 0.05 to 0.08%, Sn0.005 %, there is no effective technology for recycling this low grade tungsten tailings in existing mineral processing technology, resulting in waste of resources.

The dressing of flannelette blankets is the principle of applying the flow film dressing technology to spread the blankets on the surface of the cement grooves with a certain gradient or on the wooden groove surface, and then become flannelette blankets chute. When the pulp flows through the flannelette blankets chute, the mineral particles with different specific gravity are in the different slurry flow layers, so as to move in the slurry or slide at the bottom of the trough. The velocity of light mineral flowing along the pulp is greater than that of the significant mineral velocity, while the settlement velocity to the bottom of the trough is less than that of the significant mineral settlement, and the chorionic chute has the characteristics of long villi, many wool and dense distribution in the chorien chute. When the pulp flows through the blankets, because of the role of the villi, it has a strong adhesion to small size and larger minerals, and has a small size. It is easier to sink to the bottom of the groove than the major minerals in the pulp flow because of the action of washing, separating and drilling, and easy to attach to the blankets. In this way, the mineral concentration can be enriched. In the different film layers, we can realize the separation and recycling to obtain high-grade wool concentrate.

(1) The blankets are covered on the rough chute surface. The slurry solid ratio of the tailings is 11~15 (Wo₃ 0.05~0.08%, containing Sn0.005%). The feed quantity of the small grooves is adjusted by the splitter plate, so that the pulp of the tailings is uniformly flowing through the flannelette blankets chute. After 1.5 hours, the small grooves stop giving the ore to the ore. The coarse concentrate in the carpet is washed into the tank by the coarse washing tank, and then the blanket is rebedding back to the chute, and then the ore is carried out the cycle.

(2) The coarse concentrate (grade of Wo₃ 2 ~ 3%) is removed in the washing pool, and the chop chute is washed with clean water, and it is easily raked on the woolen blanket by manual and soft ground. On the carpet, the grade of coarse concentrate is increased to Wo₃9 ~ 12%, and after second times of concentration, the concentrate grade reaches Wo₃20 ~ 30% and contains Sn1.0 ~ 2%. It can be collected and applied.

After the coarse selection of the tailings pulp through the flannelette blankets chute, the effluent of the tailings pulp and the one or two discharge are selected and selected two times on the flannelette blankets chute after collecting the tailings pulp, and the grade of the concentrate containing Wo₃20 to 30% and Sn1.0 to 2% can be obtained. 

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