Mining, beneficiation and smelting technology of molybdenum ore

mining

Since most molybdenum ore grades are relatively low, high efficiency mining processes are required, which typically include:

Large-scale open pit mining;

Underground ore blocks are caving and mining. In this way, large boulders can be broken and the weight reduced.

Many molybdenum mines in the world have high production capacity, and the daily transport capacity of ore can reach up to 50,000 tons.

Dressing

After a series of crushing and grinding (ball or rod grinding), the ore can be reduced to a particle size of 1 micron (1/1000 mm), thus separating the molybdenite from the matrix rock. Pulping with some agents, including some fuels and diesel, these agents adhere to the surface of the molybdenum particles and act as a hydrophobic agent.

The flotation separation takes place in a venting tank, the molybdenum particles are in contact with the foam suspended in the air, and the concentrate floats on the surface of the foam into the launder. The other impurities are then removed by regrind and re-selection, and the grade of molybdenum concentrate is improved. The final brightness concentrate containing 70% to 90% molybdenum, if necessary, by acid leaching to remove impurities such as copper and lead.

Roasting

The molybdenum concentrate can be converted into industrial molybdenum oxide by roasting, and its chemical reaction formula is:

2MoS2 + 7O2==>2MoO3+4SO2

MoS2+6MoO3==>7MoO2+2SO2

2MoO2+ O3==>2MoO3

The molybdenum concentrate is calcined in a large multi-hearth furnace or roaster, and the calcination temperature is 600 to 700 °C. The molybdenum concentrate is stirred by the stirring crucible to move the material from the center of the hearth to the surroundings, from here to the next layer, and then back to the center of the hearth, so that the uniform gas flow is 12 layers or more in 10 hours. The furnace layer is continuously circulated, and the final product - industrial molybdenum oxide generally contains not less than 57% molybdenum and less than 0.1% sulfur.

Turbine by-product contains some small amount of copper molybdenum rhenium (<0.10%), rhenium metal is an element, rhenium in the catalyst art for the production of unleaded gasoline, for the manufacture of jet engines in the field of advanced superalloys blade. Niobium is an important rare metal resource recovered during the roasting of molybdenum concentrate.

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