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Preparation method of near spherical molybdenum powder

A near-spherical, molybdenum powder technology is applied in the field of preparation of near-spherical molybdenum powder. , the effect of low raw material requirements

Active Publication Date: 2010-02-10
JINDUICHENG MOLYBDENUM CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

Spherical molybdenum powder can also be prepared by chemical vapor deposition, but the control is more difficult, and the sphericity is not as good as that of powder melting and solidification
In short, the existing spherical molybdenum powder preparation method has high requirements for equipment, small output and difficult industrialization

Method used

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  • Preparation method of near spherical molybdenum powder
  • Preparation method of near spherical molybdenum powder
  • Preparation method of near spherical molybdenum powder

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preparation example Construction

[0013] A kind of preparation method of nearly spherical molybdenum powder, the operation step of its preparation comprises:

[0014] (1) adopt molybdenum powder as raw material, and molybdenum powder is commercially available common molybdenum powder;

[0015] (2) The raw material molybdenum powder is processed with a high-energy fluidized bed colliding jet mill, and a QLM-100K miniature high-energy fluidized bed colliding jet mill is selected, with a rotating speed of 15000 rpm and a treatment time of 2 hours to obtain single particle molybdenum powder;

[0016] (3) Dissolve single-particle molybdenum powder in 10% potassium ferricyanide aqueous solution and 10% sodium hydroxide aqueous solution, or in a mixed solution composed of 40% hydrofluoric acid, 60% nitric acid and distilled water in a ratio of 1:2:4 spheroidizing the single-particle molybdenum powder with a solid-to-liquid ratio of 1:2 to 5; after filtering, the above-mentioned single-particle spheroidized molybdenum...

Embodiment 1

[0021] Take 50kg of ordinary molybdenum powder, the particle size is 4.30μm, and the bulk density is 1.05g / cm 3 . Using QLM-100K miniature high-energy fluidized bed colliding jet mill with a rotating speed of 15,000 rpm and a processing time of 2 hours, 48.16 kg of molybdenum powder was collected in the crushing area. The particle size is 4.22μm, and the bulk density is 2.74g / cm 3 .

[0022] 48.16 kg of the above-mentioned molybdenum powder was etched in a mixed solution of 10% potassium ferricyanide aqueous solution and 10% sodium hydroxide aqueous solution, the solid-liquid ratio was 1:3, time was 1 hour, room temperature. After the solid-liquid separation, wash with water twice, the solid-liquid ratio is 1:3, the time is 2 hours, and the temperature is 80°C. Dry after solid-liquid separation, time 6h, temperature 150°C. Receive molybdenum powder 46.32kg.

[0023] 46.32kg of the above-mentioned molybdenum powder was deoxidized and impurity removed in a single-tube one-t...

Embodiment 2

[0026] Take 10kg of ordinary molybdenum powder, the particle size is 3.70μm, and the bulk density is 1.01g / cm 3 . Using QLM-100K miniature high-energy fluidized bed colliding jet mill with a rotating speed of 10,000 rpm and a processing time of 3 hours, 9.91 kg of molybdenum powder was collected in the crushing area. The particle size is 3.56μm, and the bulk density is 2.26g / cm 3 .

[0027] Dissolve 9.91kg of the above molybdenum powder in a mixture of 40% hydrofluoric acid, 60% nitric acid and distilled water at a ratio of 1:2:4, solid-liquid ratio 1:4, time 1h, room temperature. After the solid-liquid separation, wash with water three times, the solid-liquid ratio is 1:3, the time is 2 hours, and the temperature is 80°C. Dry after solid-liquid separation, time 6h, temperature 150°C. Receive molybdenum powder 9.07kg.

[0028] 9.07kg of the above molybdenum powder was deoxidized and impurity removed in a single-tube one-temperature zone muffle furnace at a temperature of ...

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Abstract

The invention relates to a preparation method of near spherical molybdenum powder. The method is characterized by comprising the following steps: taking molybdenum powder prepared by hydrogen reduction on molybdenum dioxide as a raw material; processing the raw material molybdenum powder by a high-energy fluidized-bed collision air-flow mill to obtain single-particle molybdenum powder; spherizingthe molybdenum powder by a chemolysis method; and finally deoxidizing and decontaminating the molybdenum powder at a high temperature under hydrogen protection followed by sieving and combining each batch to obtain the near spherical molybdenum powder. In the method, the common molybdenum powder is processed by the high-energy fluidized-bed collision air-flow mill to disperse agglomerated particles and crush large particles to obtain the molybdenum powder with even single particle; and the single-particle molybdenum powder is spherized by acid-base dissolution action on molybdenum, and the molybdenum powder is deoxidized and decontaminated under hydrogen protection to finally obtain the near spherical molybdenum powder of the invention. The method of the invention has low requirement on the raw material, easy controlled production process, simple operation, applicability to large-scale production, yield rate up to more than 90%, greatly improved apparent density and obviously spherizedshape and no big change on Fisher particle size of the molybdenum powder.

Description

technical field [0001] The invention relates to a preparation method of nearly spherical molybdenum powder. Background technique [0002] Molybdenum is a refractory metal with high boiling point and high melting point. It has a wide range of uses in the iron and steel industry, nonferrous metallurgy, electronics, electric light source, chemical industry, agriculture and other fields. Molybdenum powder is the most important raw material for various molybdenum products, and has a vital impact on the quality and performance of molybdenum powder metallurgy products. Spherical molybdenum powder is favored by many molybdenum deep-processing enterprises because of its uniform appearance, bulk density, particle size distribution, formability and other indicators that are superior to ordinary molybdenum powder. Spherical molybdenum powder is generally obtained by solidification of molten powder by free contraction of surface energy. The typical methods are plasma granulation method ...

Claims

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Application Information

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IPC IPC(8): B22F9/00B22F9/04B22F9/16
Inventor 武洲厉学武李晶卜春阳
Owner JINDUICHENG MOLYBDENUM CO LTD
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