High Intensity Magnetic Separation of Scheelite

At present, the coarse separation of scheelite is usually by gravity separation or flotation. Because scheelite is a kind of ore which is easy to be gravity-dressed, but because scheelite has fine dissemination size, it needs to be grinded to 0.2 mm before the basic monomer dissociation, thus increasing the difficulty of gravity recovery, and the recovery rate of gravity-dressing is low, the taste of scheelite in crude concentrate is not high.

The traditional flotation is to obtain scheelite concentrate by crushing and grinding of scheelite raw ore and by one stage roughing, two stages sweeping and five stages concentrating. Because of the high operating conditions, complex process and difficult management, the reagent used in flotation is expensive and the residual reagent in the flotation return water is difficult to be treated. With the exhaustion of high-grade ore, the traditional flotation technology is increasingly unable to adapt to the poor, fine and hybrid ores.

Some scholars put forward a new type of scheelite roughing process. The raw ore is grinded by ball mill to get the pulp. The pulp is roughly separated by scheelite to get the scheelite coarse concentrate. The scheelite coarse concentrate is added with sodium silicate, 731, sodium carbonate and sodium hydroxide reagent and after five stages of concentrate, the scheelite with higher grade is obtained. The roughing of high intensity magnetic separators is as follows:

1.The raw ore is grinded by a ball mill and the slurry is roughly separated by scheelite. The scheelite coarse concentrate is added with sodium silicate, 731, sodium carbonate and sodium hydroxide after five stages of concentrating. The scheelite coarse concentrate is roughly separated by a high-intensity magnetic separator.

If the pulp contains sulfides, butadiene xanthate 2 # oil flotation reagent is added in advance, and then high-intensity magnetic scheelite roughing is carried out after flotation of sulfide, or high-intensity magnetic scheelite roughing is carried out first and then butadiene xanthate 2 # oil flotation reagent is added to flotation of sulfide.

2.The magnetic separation is carried out by a high gradient magnetic separator with a compound pulsating vertical ring. The magnetic field intensity is 8000-10000Oe, forming a high gradient magnetic separation area. The magnetic circuit has the characteristics of high enrichment ratio, difficult blockage, wide particle size range and strong adaptability.

The process of high intensity magnetic roughing has the advantages of low production cost, high metal recovery, high enrichment ratio, wide particle size and strong adaptability. It can be well adapted to the present poor, fine and hybrid ores to throw away weak magnetic minerals in scheelite and play the role of pre-discarding tailings to enrich scheelite. It reduces the amount of pulp into flotation, reduces the consumption of mineral processing agents, and reduces the cost of mineral processing. This method can be adapted to various types of raw ore, regardless of whether the original ore contains sulfide or not, can flexibly adjust the preferential minerals. In addition, the high intensity magnetic roughing process has relatively low beneficiation conditions, simple process and easy operation and management, small tailings treatment difficulty, and relatively high backwater standards.

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