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Method for preparing high-pure molybdenum oxide by vacuum decomposition of molybdenite

A technology of molybdenum oxide and molybdenite, applied in the direction of molybdenum oxide/molybdenum hydroxide, etc., can solve the problems of complex preparation process, high processing cost, and threat to the ecological environment, so as to improve the comprehensive efficiency of resources and avoid the comprehensive treatment of SO2 Burden and related emissions, effects of a wide range of applications

Inactive Publication Date: 2008-09-03
SONGXIAN EXPLOITER MOLYBDENUM
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Problems solved by technology

[0007]In order to solve the problems that the sulfur dioxide released during the oxidative roasting process of molybdenum powder in the existing production poses a great threat to the ecological environment and the production process is complicated and the processing cost is high; The purpose of the present invention is to provide a method for preparing high-purity molybdenum oxide by vacuum decomposition of molybdenite, which can obtain high-purity MoO3 powder. At the same time, the present invention has no SO2 waste gas emission and recovery problems; it not only reduces emissions but also improves the overall resource efficiency

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[0025] Such as figure 1 Shown: The method for preparing high-purity molybdenum oxide by vacuum decomposition of molybdenite, high-purity molybdenum oxide MoO is prepared by two-step method 3 , the first step is to prepare molybdenum powder with extremely low content of non-ferrous metal impurities and sulfur S, and the second step is to oxidize the molybdenum powder into high-purity molybdenum oxide by oxidation; in order to prepare high-purity MoO 3 , the grade of molybdenite must be improved, and the content of non-ferrous metal elements in it must be reduced as much as possible. The volatile non-ferrous metal elements, such as Pb, Zn, As, Sb, etc., are removed through a high-temperature vacuum furnace, and the sulfur content is also removed, but the graphite, Cu, Fe, SiO in the ore powder 2 , CaO, etc. cannot be removed by vacuum method. Therefore, the second step of the present invention is to oxidize the coarse molybdenum powder, because MoO 3 Very easy to gasify, by t...

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Abstract

The invention relates to the technology field of nonferrous metallurgy, in particularly to a method of preparing pure molybdenum trioxide by vacuum decomposing a molybdenite which is suitable for producing a metal molybdenum powder. The method takes two steps to prepare the pure molybdenum trioxide MoO3: the first step is to prepare a nonferrous impurity and a molybdenum powder with low content of sulfur; the second step is to oxidize the molybdenum powder into the pure molybdenum trioxide by the oxidation process, then the pure MoO3 powder can be produced, and at the same time the method has no SO2 exhaust emission and recovery problems, which reduces exhaust emission and enhances comprehensive efficiency of resources. The MoO3 powder can also be taken as the raw material for producing molybdenum powder by hydrogen reduction; the pure molybdenum powder can be obtained and the application field of the method is broader.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal metallurgy, in particular to a method for preparing high-purity molybdenum oxide by vacuum decomposition of molybdenite, which is suitable for producing metal molybdenum powder. Background technique [0002] Molybdenum is an important strategic resource in my country. It is very rich in resources and its total reserves rank second in the world. Molybdenum is mainly consumed in the iron and steel industry, accounting for about 70% to 80% of molybdenum products. Among them, molybdenum consumed by various structural alloy steels accounts for 43% to 44% of the total molybdenum consumption, and the proportion of molybdenum consumed by stainless steel is 22%. ~23%, molybdenum consumed by tool steel and high-speed steel accounted for about 8%, cast steel and roll consumption accounted for about 6%. Almost all steels contain molybdenum, and its content is generally 0.1% to 10%. This is because ...

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Application Information

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IPC IPC(8): C01G39/02
Inventor 赵维保赵维根郭培民
Owner SONGXIAN EXPLOITER MOLYBDENUM
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