Method for preparing electron-grade nano molybdenum powder

Abstract

The invention discloses a method for preparing an electron-grade nano molybdenum powder. The method comprises the following steps: I, putting the high-purity nano-grade molybdenum dioxide powder intoa boat; II, feeding the boat with the molybdenum dioxide through a reduction furnace with five temperature zones in sequence, and introducing hydrogen in an opposite direction to carry out reduction treatment. By adopting the method, control temperatures expected by reactions can be greatly reduced, the overall reduction reaction efficiency can be improved, impurities can be reduced, and the method is applicable to preparation of high-purity molybdenum products and common tungsten, molybdenum, rhenium powder and other metals.

Description

technical field [0001] The invention relates to a method for preparing electronic grade nanomolybdenum powder. Background technique [0002] At present, in the process of preparing molybdenum from molybdenum dioxide in a reduction furnace, molybdenum dioxide powder is generally sent to the reduction furnace at a high temperature above 500°C. During the reduction process, because the powder is in a stacked state, the temperature of the molybdenum dioxide powder inside or at the bottom of the stack often does not reach the reaction temperature, and the reduction reaction does not occur if the inside does not reach the reaction temperature. Therefore, we need to increase the reaction temperature to increase the yield. But after we increase the high temperature, when the inside or bottom of the stack reaches the reaction temperature to generate molybdenum, other reactions occur on the surface and other places, which often increases the production of impurities. [0003] At the...

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Problems solved by technology

However, after we increase the high temperature, when the inside or bottom of the stack reaches the reaction temperature to generate molybdenum, other reactions occur on the surface and other places, which often increase the production of impurities

[0003] At the same time, during the reduction reaction process, the stacking is prevented in the container, and the container is generally made of nickel complex alloy. The water vapor generated by the internal reaction cannot be directly and timely removed, forming water droplets into molybdenum (Mo) to form agglomeration, and the dripping material not only increases Molybdenum sieve, and affect the quality of subsequent molybdenum powder products, while reducing the purity of the product

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