An Effective Separation Process for Tungsten-Molybdenum Associated Ore

Molybdenum and tungsten resources are China's dominant resource minerals. China's reserves of molybdenum and tungsten resources, mining and processing volume, and trade volume occupy an important position in the world, while tungsten is in the first place. Tungsten mainly exists in the form of black tungsten and scheelite. The scheelite often contains a certain amount of molybdenum, which is usually in the form of molybdenum sulfide, which can be separated by conventional flotation methods. The tungsten resource containing molybdenum oxide is difficult to process. It is rarely used.

Unfortunately, there are a certain amount of molybdenum oxide ore in the main molybdenum ore districts of China, such as the Xing'anling-Inner Mongolia-Tianshan metallogenic belt. Most of the tungsten-molybdenum ore discovered has this situation, and it has not been developed on a large scale due to difficulties in development and utilization. The molybdenum-tungsten oxidized ore has not been industrially implemented due to high recycling costs and low technical and economic indicators. Recently, a molybdenum-molybdenum-tungsten mine in Inner Mongolia has found a key to the processing technology of this type of tungsten-molybdenum associated ore by studying the key new technologies of ore dressing. The main realization processes are as follows:

A. The raw material is oxidized by tungsten-molybdenum ore, pulverized to -200 mesh, 49%, and the mineral monomer dissociation degree is ≥70%;

B. using molybdenum sulphide in water glass, kerosene, 2# oil or sodium hexametaphosphate, copper sulphate, butyl xanthate flotation molybdenum tungsten oxidized ore, and selected coarse ore concentrate to obtain molybdenum sulfide concentrate;

C. The sulphide ore flotation tailings are classified, the grading granularity is 80μm, the coarse-grained grade enters the coarse sand rough selection process, and the fine-grained grade enters the slime rough selection process;

D. The mud sand system uses sodium carbonate or sodium hydroxide or lime as the pulp conditioner, and the dosage range is 400 g / ton ore; the water glass is the gangue inhibitor, the dosage range is 700 g / ton ore; the collector uses fatty acid And adding 2% anionic or nonionic surfactant to it, emulsification at a temperature of 50 ° C, emulsification time of 3 hours, the amount of collector 150 g / ton of ore; coarse sand coarse selection and coarse ore The selected coarse concentrate is mixed and then enters the selection system to obtain a molybdenum-tungsten oxide ore mixed concentrate.

E. The molybdenum-tungsten oxidized ore mixed concentrate obtained above is re-grinded, the grinding fineness is controlled at -200 mesh, 70%, so that the molybdenum-tungsten oxide ore reaches monomer dissociation; the gangue inhibitor is added in an amount of 80 g. / ton of ore; through the selection of a second selection of molybdenum-tungsten mixed concentrate;

F. The obtained second-selected molybdenum-tungsten mixed concentrate is selected by the Petrov method scheelite ore selection method. The chemicals and conditions used by the Petrov method are: pulp concentration 40%; water glass dosage 10kg/t Temperature 70 ° C, action time 3 hours; diluted drug removal, selection; foam concentrate is scheelite, selected tailings is molybdenum oxide tungsten mixed concentrate, the initial separation of molybdenum tungsten oxide ore.

The adopted process initially solved the problem of low technical index of tungsten oxide molybdenum symbiotic ore dressing, and obtained the mixed concentrate of scheelite concentrate and molybdenum oxide tungsten respectively. The quality of molybdenum sulfide concentrate conforms to national standard GB-3200-82, tungsten product In line with national standard GB-2825-81. It perfectly solves the problem of low grade of molybdenum and tungsten oxidized ore concentrate, low metal recovery rate and high cost.

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