Method for producing silicon carbide from silica gel byproduct in phosphorous fertilizer production

A silicon carbide and silica gel technology, applied in the comprehensive utilization of phosphate fertilizer by-product silica gel resources, the production of silicon carbide, and the field of inorganic chemical industry, can solve the problems of difficult to control spontaneous reaction, small product particle size and high purity, and achieve the benefit of protection and effective utilization. , small particle size, high purity effect

Inactive Publication Date: 2011-02-16
云南云天化国际化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] II. Self-propagating high-temperature synthesis method: using SiO 2 The exothermic reaction with Mg to make up for the lack of heat, the main reaction is SiO 2 +C+2Mg→SiC+2MgO, this method has the advantages of simple equipment process, high production efficiency, low energy consumption, small particle size and high purity of the obtained product, and its disadvantage is that the spontaneous reaction is difficult to control, and the product needs to be removed by pickling and other subsequent processes. Mg, MgO

Method used

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  • Method for producing silicon carbide from silica gel byproduct in phosphorous fertilizer production
  • Method for producing silicon carbide from silica gel byproduct in phosphorous fertilizer production
  • Method for producing silicon carbide from silica gel byproduct in phosphorous fertilizer production

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Effect test

Embodiment 1

[0027] After the raw materials are pretreated, press no 木炭 : n 石油焦 = 45:55 for batching and mixing evenly; send the mixture into a high-temperature carbon tube furnace and vacuumize to 4.75×10 -2 mbar, heating up to 600°C, the heating rate is 25°C·min -1 , keep warm for 15min, and evacuate to 4.75×10 -2 Below mbar, use argon as the protective gas, the protective gas pressure is 0.02MPa, the protective gas flow rate is 5.0CFH, and the pressure is 5.0×10 -2 mbar, heating up to 1650°C, the heating rate is 25°C·min -1, keep warm for 45min; use helium cooling, the helium pressure is 0.02MPa, the helium flow rate is 5.0CFH, and the reaction product can be obtained after cooling to room temperature for 3h.

Embodiment 2

[0029] After the raw materials are pretreated, press no 木炭 : n 石油焦 = 35:65 for batching and mixing evenly; send the mixture into the high-temperature carbon tube furnace and vacuumize to 4.75×10 -2 mbar, 1mbar=100Pa, heating up to 600°C, the heating rate is 25°C·min -1 , keep warm for 15min, and evacuate to 4.75×10 -2 Below mbar, use argon as the protective gas, the protective gas pressure is 0.02MPa, the protective gas flow rate is 5.0CFH, 1CFH=472cm 3 min -1 , the pressure is 5.0×10 +1 mbar, heating up to 1450°C, the heating rate is 25°C·min -1 , keep warm for 60min; use helium cooling, the helium pressure is 0.02MPa, the helium flow rate is 5.0CFH, and the reaction product can be obtained after cooling to room temperature for 3h.

Embodiment 3

[0031] After the raw materials are pretreated, press no 木炭 : n 石油焦 = 35:65 for batching and mixing evenly; send the mixture into the high-temperature carbon tube furnace and vacuumize to 4.50×10 -2 mbar, 1mbar=100Pa, heating up to 600°C, the heating rate is 25°C·min -1 , keep warm for 15min, and evacuate to 4.50×10 -2 Below mbar, use argon as the protective gas, the protective gas pressure is 0.02MPa, the protective gas flow rate is 5.0CFH, 1CFH=472cm 3 min -1 , the pressure is 5.0×10 +0 mbar, heating up to 1450°C, the heating rate is 25°C·min -1 , keep warm for 30min; use helium cooling, the helium pressure is 0.02MPa, the helium flow rate is 5.0CFH, and the reaction product is cooled to room temperature for 3h to obtain the product.

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Abstract

The invention discloses a method for producing silicon carbide from a silica gel byproduct in phosphorous fertilizer production, belongs to the field of inorganic chemical industry, and relates to the technical fields of recycling of the silica gel byproduct in phosphorous fertilizer production and production of the silicon carbide. The silica gel byproduct in phosphorous fertilizer production is taken as a silicon source and the silicon carbide is produced through carbonthermal reduction; and the method comprises the following steps of: a, preprocessing raw materials; b, mixing the raw materials; c, reacting; and d, cooling. By taking the silica gel byproduct in phosphorous fertilizer production as the silicon source, a new product and a new technique for recycling the silica gel byproduct in phosphorous fertilizer production are developed. The method has the advantages of simple process and low cost; the obtained product has the characteristics of high purity, small granularity and the like; and the method is favorable for controlling the environmental pollution of the phosphorous fertilizer industry and protecting and effectively utilizing the silicon resource associated with phosphate rock, and brings good social and economic benefits.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry, relates to a method for producing silicon carbide by using silica gel by-product of phosphate fertilizer, and relates to the technical fields of resource utilization and comprehensive utilization of silica gel by-product of phosphorous fertilizer and production of silicon carbide. Background technique [0002] Phosphate fertilizer by-product silica gel mainly comes from the absorption process of fluorine-containing waste gas and the production of fluorides, such as sodium fluoride, ammonium fluoride, aluminum fluoride, cryolite, hydrogen fluoride, etc., using fluorosilicate solution. If the by-product silica gel of phosphate fertilizer cannot be effectively recycled, it will inevitably cause resource waste and environmental pollution; on the contrary, if the by-product silica gel can be fully recycled, it will bring good social and economic benefits. With the improvement of fluorine rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36
Inventor 明大增李志祥李勇辉钟英
Owner 云南云天化国际化工有限公司
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