Method for preparing submicron molybdenum powder

Abstract

The invention discloses a method for preparing submicron molybdenum powder, which comprises the following steps that: ammonium molybdate or molybdenum trioxide are put in a mechanical crusher to be crushed into fine-particle raw materials, and the fine particle raw materials are put in a material boat; the fine-particle raw materials in the material boat are subjected to the primary hydrogen reduction in a reduction temperature region in a primary reduction furnace, and the product of the primary hydrogen reduction is molybdenum dioxide; then the material boat filled with the molybdenum dioxide is directly pushed into a secondary reduction furnace, the molybdenum dioxide in the material boat is subjected to the secondary hydrogen reduction in a reduction temperature region in the secondary reduction furnace, and the product of the secondary hydrogen reduction in the material boat is molybdenum powder; and finally, the sub-micron molybdenum powder can be obtained by sieving with a 160-mesh screen. The method for preparing the submicron molybdenum powder adopts the reduction temperature lower than the conventional reduction temperature, and short temperature region used in the reduction process, thereby reducing cost; and the average Fisher particle size of the prepared molybdenum powder is small, the specific surface area is large, and the activity is high, thereby being favorable for the follow-up sintering process.

Description

technical field [0001] The invention belongs to the technical field of rare metal powder metallurgy, and in particular relates to a preparation method of submicron molybdenum powder. Background technique [0002] At present, the raw materials for preparing molybdenum powder in the prior art generally use ammonium molybdate with an average Fischer particle size of 10-30 μm and high-purity molybdenum trioxide with an average Fischer particle size of 8-15 μm. The equipment used in the reduction process of this series of raw materials has 5 reduction temperature zones, and the temperature of each temperature zone is different. The low temperature reduction temperature is 500-600 ° C, and the high temperature reduction temperature is 930 ~ 1050 ° C. The reduction temperature is high and the pushing time is long. , The low-temperature reduction push time is 30-40min, and the high-temperature reduction push time is 50-60min. The reduction time and reduction temperature of each raw ...

AI Technical Summary

Problems solved by technology

The equipment used in the reduction process of this series of raw materials has 5 reduction temperature zones, and the temperature of each temperature zone is different. The low temperature reduction temperature is 500-600 ° C, and the high temperature reduction temperature is 930 ~ 1050 ° C. The reduction temperature is high and the pushing time is long. , The low-temperature reduction push time is 30-40min, and the high-temperature reduction push time is 50-60min. The reduction time and reduction temperature of each raw material are different when the raw material goes through each reduction temperature zone, and the quality of the obtained molybdenum powder will be uneven. And the average Fischer particle size of molybdenum powder is relatively large, the average Fischer particle size of molybdenum powder prepared by conventional technology is generally ≥3.0μm, and the specific surface area is ≤0.5m 2 / g