Pure Molybdenum Trioxide Production From Calcine
【China Molybdenum Industry News Network】
There are two ways to pure molybdenum trioxide production from Calcine:
First, the sublimation method, the second is a hydrometallurgical method. Leaching, purification with ammonia solution wherein the impurity is removed, followed by crystallization or hydrochloric acid and the molybdenum into ammonium paramolybdate (Mo ≥ 56%) or molybdate state precipitated, and then by baking Solutions Serve pure molybdenum trioxide. Finally, pure molybdenum trioxide with hydrogen reduction method to molybdenum metal powder (Mo ≥ 99.7% ~~ 99.9%), and then the powder metallurgy method or further into the legal system molybdenum ingots using arc melting or molybdenum strip (Mo ≥ 99.8% ~~ 99.95%) .
The molybdenum concentrate smelting at home and abroad also study to test a number of new techniques and methods, for example by oxidation of the molybdenite concentrate roasting, directly with the oxygen pressure cooking method or bacterial leaching method to extract pure molybdenum trioxide. Of low-grade oxide ore leaching with sulfuric acid from the solution using ion exchange process or the extraction of pure molybdenum trioxide. In addition, molybdenum concentrate smelting method, as well as lime roasting method, nitrate leaching, sodium hypochlorite leaching and electro-oxidation leaching.
Rhenium molybdenum concentrate, mainly from the oxidation roasting of molybdenum concentrate flue leaching or oxygen pressure cooking medium for recycling, and then from the solution using the extraction method or an ion exchange method of perhenic potassium or ammonium perrhenate , and then restore the legal system into a high-purity rhenium powder.
There are some impurities such as copper, lead, tin, arsenic, phosphorus, calcium, silica, etc.It not only affects the quality of molybdenum products,but also affect the molybdenum smelting technology and equipment,and pollution of the environment.Smelting before the need for strict control, or to be recycled in the smelting,and thus become a useful component,greatly improving the industrial value of the molybdenum deposit.
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