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Method for preparing low-potassium molybdenum powder

A technology for molybdenum powder and potassium content, which is applied in the field of producing low-potassium molybdenum powder, can solve problems such as difficulty in meeting the requirements of the electronics industry, and achieve the effects of easy control of the production process, low raw material requirements, and wide application

Inactive Publication Date: 2009-01-28
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of preparing molybdenum powder generally adopts the method of hydrogen reduction. According to the different processing processes, there are one-stage hydrogen reduction method, two-stage hydrogen reduction method, three-stage hydrogen reduction method, etc., but the potassium content of the prepared molybdenum powder is generally 50ppm. above, it is difficult to meet the requirements of the electronics industry

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  • Method for preparing low-potassium molybdenum powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 50 kg of ordinary molybdenum dioxide prepared by one-time reduction of ammonium molybdate and pass through an 80-mesh standard sieve for subsequent use. The potassium content is 145 ppm, the carbon content is 240 ppm, the particle size is 2.1 μm, and the bulk density is 1.05 g / cm 3 . A single-tube, one-temperature-zone muffle furnace was used for reduction. The thickness of the material layer in the boat was controlled at 1 cm, and the temperature was set at 1100 ° C. After entering the heating zone, the material was kept for 5 hours, and then pushed to the cooling zone to cool for 1 hour before being released from the furnace. Put the material into a three-dimensional vacuum ball mill for ball milling, the weight ratio of ball to material is 2:1, and the ball milling time is 1 h. The vacuum degree of the ball mill should be less than 30KPa, and stand for 4 hours at the end of the ball mill. Finally, the discharge passes through a standard sieve with a mesh number...

Embodiment 2

[0020] Get ammonium molybdate and obtain molybdenum trioxide by roasting and then reduce 50 kg of molybdenum dioxide prepared by passing through an 80-mesh standard sieve for later use. The potassium content is 159 ppm, the carbon content is 240 ppm, the particle size is 2.1 μm, and the bulk density is 1.05 g / cm 3 . Use a single-tube, one-temperature-zone muffle furnace for reduction. The thickness of the boat-loaded material layer is controlled at 2 cm, and the temperature is set at 1250 ° C. After entering the heating zone, the material is kept for 2 hours, and then pushed to the cooling zone to cool for 1 hour before being released from the furnace. Put the material in a three-dimensional vacuum ball mill for ball milling, the weight ratio of ball to material is 5:1, and the ball milling time is 4 hours. The vacuum degree of the ball mill should be less than 30KPa, and stand for 4 hours at the end of the ball mill. Finally, the discharge passes through a standard sieve wit...

Embodiment 3

[0023] Molybdenum dioxide 50kg passed through 80-mesh standard sieve for later use, its potassium content is 40ppm, carbon content is 240ppm, particle size is 2.1μm, bulk density is 1.05g / cm 3 . Use a single-tube, one-temperature-zone muffle furnace for reduction. The temperature is set at 1600°C, and the thickness of the material layer in the boat is controlled at 4 cm. After the material enters the heating zone, it is kept for 1 hour, and then pushed to the cooling zone to cool for 1 hour before being released from the furnace. Put the material in a three-dimensional vacuum ball mill for ball milling, the weight ratio of ball to material is 1:1, and the ball milling time is 5 hours. The vacuum degree of the ball mill should be less than 30KPa, and stand for 4 hours at the end of the ball mill. Finally, the discharge passes through a standard sieve with a mesh number of 200, and after sampling and testing, the molybdenum powder of the present invention is obtained by packagi...

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Abstract

The invention relates to a method for preparing molybdenum powder with low kalium which is characterized in that molybdenum dioxide with a kalium content less than 160ppm is adopted as material; after the molybdenum dioxide is screened, the molybdenum powder with low kalium is prepared by carrying out two process hydrogen reducing, vacuum breaking and ball milling as well as screening. The method of the invention has low demands on the materials and the materials are easily obtained; the production technique is easy to be controlled; the operation is simple, safe, reliable and is applicable to mass production; the granularity of a product is uniformly distributed and the consistency is good; compared with the common molybdenum powder, the kalium content of the product obtained by the method of the invention can be controlled under 20ppm; the content of carbon can be controlled under 20ppm; the content of oxygen can be controlled under 600ppm. The granularity can be controlled between 3 and 7 Mum; the apparent density can be controlled between 1.4 and 2.8g / cm<3>; the tap density can be controlled between 3.5 and 4.5g / cm<3>. The product of the invention has broad application in the electron processing industry and has potential in the field of the target of an LCD in particular.

Description

technical field [0001] The invention relates to a method for preparing low-potassium 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. With the continuous advancement of science and technology, the application field of molybdenum is expanding. 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. The demand for molybdenum powder in the electronic field is increasing, and the requirements for physical and chemical indicators of molybdenum powder are also different from those of ordinary molybdenum powder. In particular, there is a stricter requirement for the potassium content in molybdenum powder, which m...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F1/00
Inventor 武洲
Owner JINDUICHENG MOLYBDENUM CO LTD
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