Method for preparing molybdenum powder by molybdenum trioxide

A technology of molybdenum trioxide and molybdenum powder, which is applied in the field of molybdenum trioxide to prepare molybdenum powder, which can solve the problems of poor fluidity, production paralysis, energy consumption and cost increase, and achieve the effect of narrow control range and high precision

A technology of molybdenum trioxide and molybdenum powder, which is applied in the field of molybdenum trioxide to prepare molybdenum powder, which can solve the problems of poor fluidity, production paralysis, energy consumption and cost increase, and achieve the effect of narrow control range and high precision

CN103273073AActive Publication Date: 2013-09-04JINDUICHENG MOLYBDENUM CO LTD
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  • Method for preparing molybdenum powder by molybdenum trioxide
  • Method for preparing molybdenum powder by molybdenum trioxide
  • Method for preparing molybdenum powder by molybdenum trioxide

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Embodiment 1

[0032] The method that present embodiment utilizes molybdenum trioxide to prepare molybdenum powder comprises the following steps:

[0033] Step 1. Molybdenum trioxide is passed through a 40-mesh sieve to get the oversize, and then the oversize after sieving is put into a ball mill for ball milling to obtain molybdenum trioxide powder with a molybdenum mass percentage content of 66.62%; in the present embodiment, The ball mill is an ASM type horizontal agitating ball mill, and the ball milling medium in the ASM type horizontal agitating ball mill is a molybdenum ball with a molybdenum mass percentage content of 99.95% and a diameter of 10mm; the Fischer particle size of the molybdenum trioxide powder is 6.0 μm, the bulk density of the molybdenum trioxide powder is 0.95g / cm 3 The moisture content of the molybdenum trioxide powder (the moisture content of the molybdenum trioxide powder refers to the mass percentage of water in the molybdenum trioxide powder) is 1.5%;

[0034] S...

Embodiment 2

[0039] The method that present embodiment utilizes molybdenum trioxide to prepare molybdenum powder comprises the following steps:

[0040] Step 1, passing molybdenum trioxide through a 40-mesh sieve to get the oversize, and then putting the sieved oversize into a ball mill for ball milling to obtain molybdenum trioxide powder with a molybdenum mass percentage of 66.63%; in this embodiment, The ball mill is an ASM type horizontal agitating ball mill, and the ball milling medium in the ASM type horizontal agitating ball mill is a molybdenum ball with a molybdenum mass percentage content of 99.97% and a diameter of 12mm; the Fischer particle size of the molybdenum trioxide powder is 4 μm, the bulk density of the molybdenum trioxide powder is 0.9g / cm 3 The moisture content of the molybdenum trioxide powder (the moisture content of the molybdenum trioxide powder refers to the mass percentage of water in the molybdenum trioxide powder) is 1.7%;

[0041] Step 2. Under a hydrogen at...

Embodiment 3

[0046] The method that present embodiment utilizes molybdenum trioxide to prepare molybdenum powder comprises the following steps:

[0047] Step 1. Molybdenum trioxide is passed through a 40-mesh sieve to get the oversize, and then the oversize after sieving is put into a ball mill for ball milling to obtain molybdenum trioxide powder with a molybdenum mass percentage content of 66.62%; in the present embodiment, The ball mill is an ASM type horizontal agitating ball mill, and the ball milling medium in the ASM type horizontal agitating ball mill is a molybdenum ball with a molybdenum mass percentage content of 99.97% and a diameter of 8 mm; the Fischer particle size of the molybdenum trioxide powder is 8 μm, the bulk density of the molybdenum trioxide powder is 1.0g / cm 3 The moisture content of the molybdenum trioxide powder (the moisture content of the molybdenum trioxide powder refers to the mass percentage of water in the molybdenum trioxide powder) is 1.6%;

[0048] Step...

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Abstract

The invention provides a method for preparing molybdenum powder by molybdenum trioxide. The method includes the steps: firstly, sieving the molybdenum trioxide by a 40-mesh sieve to obtain oversize materials and then throwing the sieved oversize materials into a ball mill for ball-milling to obtain molybdenum trioxide powder; secondly, performing primary hydrogen reduction treatment for the molybdenum trioxide powder by a primary reduction furnace in hydrogen atmosphere to obtain molybdenum dioxide; thirdly, performing secondary hydrogen reduction treatment for the molybdenum dioxide by a secondary reduction furnace in the hydrogen atmosphere to obtain rough molybdenum powder; and fourthly, sieving the rough molybdenum powder and then uniformly mixing the rough molybdenum powder in a mixer to obtain finished molybdenum powder. The method is simple in preparation process, safe, reliable and suitable for industrial batch production. The molybdenum powder prepared by the method can meet the technical requirement of the national standard GB / T3461-2006, and can be widely used for preparing raw materials for molybdenum and molybdenum alloy products such as molybdenum slabs, molybdenum bar billets, molybdenum ejector headers and molybdenum special-shaped parts.

Description

technical field [0001] The invention belongs to the technical field of rare metal powder metallurgy, and in particular relates to a method for preparing molybdenum powder by using molybdenum trioxide. Background technique [0002] Molybdenum trioxide is an indispensable compound for the production of molybdenum products, and the density of molybdenum trioxide is 4.69g / cm 3 , with a melting point of 795°C and a boiling point of 1155°C, easy to sublimate, insoluble in water, soluble in ammonia water and strong alkali solution, capable of generating molybdate, and can be reduced by hydrogen, carbon, and aluminum at high temperatures. The most widely used molybdenum trioxide is MoO 3 High-purity molybdenum trioxide with a mass percentage of not less than 99.95%. [0003] In the industrial production process, molybdenum trioxide is usually prepared by roasting ammonium molybdate as raw material. Since the roasting process of ammonium molybdate is accompanied by the generation ...

Claims

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Application Information

Patent Timeline
04 Sep 2013
Publication
CN103273073A
IPC
B22F9/22
Inventors
韩强; 马全智