钼矿选矿工艺

Molybdenum

The main method of molybdenum beneficiation is flotation. In the deep separation of molybdenum ore containing trace copper, a partial mixed preferential flotation process is adopted. Molybdenum beneficiation processes include molybdenum beneficiation, copper-molybdenum beneficiation, tungsten-molybdenum beneficiation and molybdenum-bismuth beneficiation. Commonly used methods are sodium sulfide and sodium cyanide to separate copper and molybdenum and to concentrate molybdenum. The number of molybdenum concentrates mainly depends on the total enrichment ratio of molybdenum. Generally, if the total enrichment ratio is high, the number of cleaning is usually more; if the total enrichment ratio is low, the number of cleaning is usually less. Chat With Us Leave Message

The beneficiation process of molybdenum ore can be applied to single molybdenum ore or refractory molybdenum ore with complex ore properties, closely intergrowth with sulphide minerals and fine particle size. Common are single molybdenum ore, copper molybdenum ore, tungsten molybdenum ore and molybdenum bismuth ore.

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  1. Molybdenum ore is broken and sent to silo by hoist.
  2. The ores are fed into the grinder mill.
  3. The grinded ores enter the spiral classifier or hydrocyclone, and the ore mixtures are cleaned and graded by the spiral classifier or hydrocyclone.
  4. The slurry enters the flotation machine through the agitating tank. Adding different flotation agents according to different mineral characteristics.
  5. After treatment by flotation column and slurry pump, it is sent to the filter press for dehydration, reaching the national standard.

From the point of view of some molybdenum concentrators in China’s non-ferrous system, the grade of treated raw ore varies greatly, with a high grade of more than 0.3%, a low grade of less than 0.1%, and some of them are only 0.02%. The real recovery rate of molybdenum processing equipment is over 80%. The concentrate grade is 45%-54%, the tailings grade is about 0.02%, some tailing grade is as high as 0.04%, some is as low as 0.01%.

In the current industrial production of molybdenum, the equipment and process of molybdenum mainly uses molybdenite concentrate for smelting, including oxidation roasting, extraction of pure molybdenum trioxide, reduction roasting to metal molybdenum powder and so on.

Molybdenum concentrate is oxidized and roasted in reflex furnace, multi-hearth furnace, fluidized bed furnace or Flash furnace. After desulfurization, it is made into a kind of Calcine of impure molybdenum trioxide. The calcine can produce ferromolybdenum alloy by metal thermal method or silicothermal method. There are two ways to produce pure molybdenum trioxide from calcine: sublimation and hydrometallurgy. The impurities were removed by leaching and purifying with ammonia solution, then molybdenum was precipitated into ammonium paramolybdate or molybdic acid by crystallization or hydrochloric acid neutralization, and then pure molybdenum trioxide was obtained by roasting. Finally, pure molybdenum trioxide is reduced to metal molybdenum powder by hydrogen reduction method, and then molybdenum ingot or molybdenum bar are produced by powder metallurgy method or further arc smelting method.

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