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Method for microwave roasting of molybdenite concentrate to produce high-purity molybdenum oxide

A technology of microwave roasting and molybdenum oxide, which is applied in the field of molybdenum metallurgy, can solve the problems of high energy consumption of pure molybdenum trioxide, large consumption of ammonia water, and long process, and achieve uniform product composition and particle size, shortened production cycle, and low sublimation temperature Effect

Active Publication Date: 2015-02-04
徐州宇帆机电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of long process flow, complex process, large consumption of ammonia water, serious environmental pollution and high energy consumption of producing pure molybdenum trioxide by molybdenite sand sublimation method, and provides A process for producing high-purity molybdenum trioxide by directly roasting molybdenite concentrate by microwave, the present invention is realized through the following technical scheme

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method for producing high-purity molybdenum oxide by microwave roasting molybdenite concentrate has the following specific steps:

[0024] (1) First crush and ball mill the molybdenite concentrate to a particle size of 80 mesh, then spread the crushed molybdenite concentrate to a thickness of 2cm, and place it in a microwave cavity with a frequency of 2.45GHz and an output power of 0~6kW. The molybdenite concentrate contains the following mass percentage components: 43.28% molybdenum, 28.85% sulfur, 11.31% silicon dioxide, 0.92% copper, 3.04% iron, 0.16% lead, 0.021% phosphorus, 0.02% tin, 0.01% tungsten trioxide %;

[0025] (2) Turn on the microwave output switch, drum into 7m 3 / h compressed air, adjust the microwave output power to 3kW, after crushing, the molybdenite concentrate is heated from room temperature at a rate of 30°C / min to 450°C for 80min pre-oxidation;

[0026] (3) The molybdenite concentrate after the pre-oxidation treatment in step (2) is rapidl...

Embodiment 2

[0030] The method for producing high-purity molybdenum oxide by microwave roasting molybdenite concentrate has the following specific steps:

[0031] (1) First crush and ball mill the molybdenite concentrate to a particle size of 120 mesh, then spread the crushed molybdenite concentrate to a thickness of 4cm, and place it in a microwave cavity with a frequency of 2.45GHz and an output power of 0~6kW. The molybdenite concentrate contains the following mass percentage components: 44.64% molybdenum, 29.05% sulfur, 11.37% silicon dioxide, 0.83% copper, 3.04% iron, 0.10% lead, 0.03% phosphorus, 0.02% tin, 0.02% tungsten trioxide %;

[0032] (2) Turn on the microwave output switch, drum into 10m 3 / h compressed air, adjust the microwave output power to 6kW, after crushing, the molybdenite concentrate is heated from room temperature at a rate of 50°C / min to 600°C for 40min pre-oxidation;

[0033] (3) The molybdenite concentrate after the pre-oxidation treatment in step (2) is rapid...

Embodiment 3

[0037] The method for producing high-purity molybdenum oxide by microwave roasting molybdenite concentrate has the following specific steps:

[0038] (1) First crush and ball mill the molybdenite concentrate to a particle size of 50 mesh, then spread the crushed molybdenite concentrate to a thickness of 1cm, and place it in a microwave cavity with a frequency of 2.45GHz and an output power of 0~6kW. Among them, the molybdenite concentrate contains the following components in mass percentage: molybdenum 44.64%, sulfur 28.93%, silicon dioxide 11.37%, copper 0.92%, iron 3.04%, lead 0.16%, phosphorus 0.021%, tin 0.02%, tungsten trioxide 0.01% %;

[0039] (2) Turn on the microwave output switch, drum into 15m 3 / h compressed air, adjust the microwave output power to 6kW, after crushing, the molybdenite concentrate is heated from room temperature at a rate of 60°C / min to 400°C for 120min pre-oxidation;

[0040] (3) The molybdenite concentrate after the pre-oxidation treatment in s...

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Abstract

Belonging to the technical field of molybdenum metallurgy, the invention relates to a method for microwave roasting of molybdenite concentrate to produce high-purity molybdenum oxide. The method includes: firstly conducting crushing and ball milling on molybdenite concentrate, then spreading the crushed molybdenite concentrate to a thickness of 1-4cm, and placing the product in a microwave cavity; turning on a microwave output switch, blowing in compressed air, regulating the microwave output power, and carrying out pre-oxidation on the crushed molybdenite concentrate; heating the pre-oxidized molybdenite concentrate to a sublimation temperature and performing thermal insulation for 30-60min, in the process, letting the molybdenum trioxide steam generated by oxidizing roasting overflow through a microwave reactor top, performing water-cooling and then conducting collection by a bag dust collector, thus obtaining high-purity molybdenum trioxide reaching the nonferrous metal industry grade 2 standard. The method provided by the invention has the advantages of short technological process, low energy consumption, and high product purity, etc.

Description

technical field [0001] The invention relates to a method for producing high-purity molybdenum oxide by microwave roasting molybdenite concentrate, which belongs to the technical field of molybdenum metallurgy. Background technique [0002] As a national strategic resource, molybdenum is widely used in the manufacture of warships, rockets and satellites. As a major exporter of molybdenum, my country's annual export volume of molybdenum accounts for more than half of the total output, but most of them are primary products, and there are very few high-quality molybdenum products. Therefore, it is urgent to find a short-process, low-energy-consumption deep-processing method for molybdenum products . [0003] Molybdenum trioxide is an important molybdenum product. The well-known preparation method is molybdenite oxidative roasting-ammonia leaching method. The main process is firstly to oxidize molybdenite concentrate at 500~550℃ to obtain molybdenum calcined sand (mainly composed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/02
CPCC01G39/02
Inventor 刘秉国陈晓煜周俊文彭金辉郭胜惠
Owner 徐州宇帆机电科技有限公司
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