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Method for preparing high bulk density molybdenum powder

A technology of bulk density and molybdenum powder, applied in the field of preparation of molybdenum powder with high bulk density, can solve the problems of unfavorable industrial scale production, small powder loading, difficulty in separation of balls, etc. The effect of packing density and high degree of automation

Active Publication Date: 2009-12-02
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary molybdenum powder has serious agglomeration of powder particles and low loose packing density. When filling the mold, the powder is prone to produce "arch bridge" effect, which affects the pressing performance; in addition, when filling the mold with the same volume, the filling amount of powder is small, which affects production efficiency.
The disadvantages of improving the bulk density of molybdenum powder by the method of "vacuum and ball milling" are: molybdenum powder is easily polluted by balls and ball mill materials, difficult to separate ball materials, and low production efficiency, which is not conducive to industrial scale production

Method used

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  • Method for preparing high bulk density molybdenum powder
  • Method for preparing high bulk density molybdenum powder
  • Method for preparing high bulk density molybdenum powder

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preparation example Construction

[0014] A kind of preparation method of high bulk density molybdenum powder as shown in Figure 1, its preparation process is: take common molybdenum powder as raw material, the chemical composition of the raw material molybdenum powder that the present invention selects meets the requirement of GB / T3461-2006 standard, molybdenum The Fischer particle size of the powder is greater than 4.0μm, and the bulk density is 0.9-1.2g / cm 3 ; Ordinary molybdenum powder is installed in the material storage box of the fluidized bed airflow mill, and the molybdenum powder is subjected to fluidized bed airflow pulverization treatment with purified and dried nitrogen. The purity of the nitrogen after purification and drying is greater than 99.99%. Less than -45°C, pressure at 0.15-0.7MPa; online sieving and grading of the pulverized molybdenum powder, the mesh number of the rotary vibration sieve is 160 mesh, 200 mesh, 250 mesh or 325 mesh, take The next product is the product; the molybdenum po...

Embodiment 1

[0020] Take 500 kg of molybdenum powder that meets the GB / T3461-2006 standard, its average Fischer particle size is 4.0 μm, and its bulk density is 1.02 g / cm 3 . Send the prepared molybdenum powder into the material storage box of the fluidized bed jet mill according to the process requirements, and set the pressure of the gas source-purified and dried nitrogen to 0.15MPa. Turn on the linkage switch of the fluidized bed jet mill, and the fluidized bed jet mill starts to run; start the rotary vibrating sieve switch, and start sieving. The mesh size of the sieve is 200 mesh. After running for 3 hours, all the molybdenum powders are processed. Turn off the power. The processed molybdenum powder is mixed and batched in a double-cone mixer, and the mixing time is 1 hour, and the molybdenum powder of the present invention is obtained after inspection and packaging. Table 1 shows the detection results of common raw material molybdenum powder and high bulk density molybdenum powder ...

Embodiment 2

[0025] Take 500 kg of molybdenum powder that meets the GB / T3461-2006 standard, its average Fischer particle size is 4.8 μm, and its bulk density is 1.12 g / cm 3 . Send the prepared molybdenum powder into the material storage box of the fluidized bed jet mill according to the process requirements, and set the pressure of the gas source-purified and dried nitrogen to 0.5MPa. Turn on the linkage switch of the fluidized bed jet mill, and the fluidized bed jet mill starts to run; start the rotary vibrating sieve switch, and start sieving. The sieve mesh is 250 mesh. After running for 2 hours, all the molybdenum powders are processed. Turn off the power. The processed molybdenum powder is mixed and batched in a double-cone mixer, and the mixing time is 1 hour, and the molybdenum powder of the present invention is obtained after inspection and packaging. Table 2 shows the detection results of common raw material molybdenum powder and high bulk density molybdenum powder prepared in t...

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Abstract

The invention discloses a method for preparing high bulk density molybdenum powder, which comprises the following steps: processing common molybdenum powder by purified and dried nitrogen in a fluidized bed jet mill; performing on-line sieve classification on the processed molybdenum powder; and mixing the classified molybdenum powder into batches, and inspecting and packaging into finished product molybdenum powder. The method has simple process, high operating automation degree, low production cost, good product consistency and easy realization of industrialization; the method improves the bulk density of the molybdenum powder by processing the common molybdenum powder in the fluidized bed jet mill, improves the agglomeration of molybdenum powder particles, reduces 'arch bridge' effect generated when the molybdenum powder is filled in a die, and contributes to the press forming of the molybdenum powder; and the molybdenum powder prepared by the method has wide applicable range, is widely applied in the industries such as electronics and environment-friendly automobiles, and in particular has great potential in the aspect of molybdenum copper cooling plates of the environment-friendly automobiles.

Description

technical field [0001] The invention relates to a method for preparing molybdenum powder, in particular to a method for preparing molybdenum powder with high bulk density. Background technique [0002] Molybdenum is a refractory metal with a high melting point. It has a wide range of applications in the iron and steel industry, nonferrous metallurgy, electronics, electric light source, chemical industry, agriculture and other fields. Molybdenum powder is an important raw material for various molybdenum powder metallurgy products, and the performance of molybdenum powder has a crucial influence on the quality and performance of molybdenum powder metallurgy products. With the continuous advancement of science and technology, the application fields of molybdenum continue to expand, and the performance requirements for molybdenum powder are also getting higher and higher. Due to the severe agglomeration of powder particles and low bulk density of ordinary molybdenum powder, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
Inventor 付小俊
Owner JINDUICHENG MOLYBDENUM CO LTD
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