A method for deep impurity removal in metal silicon smelting

A technology for deep impurity removal and metal silicon, applied in the direction of non-metallic elements, chemical instruments and methods, silicon compounds, etc., can solve problems that are not conducive to energy saving and consumption reduction, complicated process, limited resources, etc., to improve data utilization, operation Simple, effective effect

Inactive Publication Date: 2017-10-03
怒江宏盛锦盟硅业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this kind of technical means to improve product quality and expand product variety, the "clean raw material" method is limited by the limited resources and high price of high-grade raw materials, the enhanced refining method is not conducive to energy saving and consumption reduction, and the method of acid purification is relatively complicated and not easy Safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Follow the steps below:

[0027] (1) Combined flocculant configuration: mix magnesium chloride and sodium carbonate in a certain proportion to form a combined flocculant for later use;

[0028] (2) High-temperature melting: put the silicon ore containing impurities into the smelting furnace, and melt it in an environment with a temperature of 1700°C to 1800°C;

[0029] (3) Oxygen blowing refining: keep the temperature in the smelting furnace at 1600°C to 1700°C, and inject sufficient oxygen into the silicon water;

[0030] (4) Sampling and testing: keep the temperature in the smelting furnace at 1600°C to 1650°C, and when the refining reaches a certain level, take samples to analyze the aluminum content;

[0031] (5) Deep removal of aluminum: After sampling and testing, the aluminum content in the silicon water is between 11% and 19%, and the ratio of the silicon water to the combined flocculant in step (1) is silicon water: magnesium chloride: sodium carbonate = 2500...

example 2

[0034] Follow the steps below:

[0035] (1) Combined flocculant configuration: mix magnesium chloride and sodium carbonate in a certain proportion to form a combined flocculant for later use;

[0036] (2) High-temperature melting: put the silicon ore containing impurities into the smelting furnace, and melt it in an environment with a temperature of 1700°C to 1800°C;

[0037] (3) Oxygen blowing refining: keep the temperature in the smelting furnace at 1600°C to 1700°C, and inject sufficient oxygen into the silicon water;

[0038] (4) Sampling and testing: keep the temperature in the smelting furnace at 1600°C to 1650°C, and when the refining reaches a certain level, take samples to analyze the aluminum content;

[0039] (5) Deep removal of aluminum: After sampling and testing, the aluminum content in the silicon water is between 20% and 30%, and the ratio of the silicon water to the combined flocculant in step (1) is silicon water: magnesium chloride: sodium carbonate = 2500...

example 3

[0042] Follow the steps below:

[0043] (1) Combined flocculant configuration: mix magnesium chloride and sodium carbonate in a certain proportion to form a combined flocculant for later use;

[0044] (2) High-temperature melting: put the silicon ore containing impurities into the smelting furnace, and melt it in an environment with a temperature of 1700°C to 1800°C;

[0045] (3) Oxygen blowing refining: keep the temperature in the smelting furnace at 1600°C to 1700°C, and inject sufficient oxygen into the silicon water;

[0046] (4) Sampling and testing: keep the temperature in the smelting furnace at 1600°C to 1650°C, and when the refining reaches a certain level, take samples to analyze the aluminum content;

[0047] (5) Deep removal of aluminum: After sampling and testing, the aluminum content in the silicon water exceeds 30%, and the ratio of the silicon water to the combined flocculant in step (1) is silicon water: magnesium chloride: sodium carbonate = 2500: 40: 57 ; ...

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PUM

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Abstract

The invention belongs to the field of metal silicon smelting technology, and in particular relates to a method for deep impurity removal in metal silicon smelting, comprising six steps of combined flocculent configuration, high temperature melting, oxygen blowing refining, sampling detection, deep aluminum removal and filtering impurity removal. The invention can reduce the aluminum content in metal silicon to within 0.18% in the traditional refining process, and can upgrade the metallurgical grade silicon to the grade of chemical grade silicon without increasing the refining procedure too much, with relatively good effect and low cost .

Description

technical field [0001] The invention belongs to the technical field of metal silicon smelting, and in particular relates to a method for deep impurity removal in metal silicon smelting. Background technique [0002] Metal silicon has high requirements on impurities, especially Fe, Al, Ca, etc. in it. In the metal silicon smelting process, the removal rate of calcium by oxygen blowing refining can reach about 93%, while the removal rate of aluminum is only 68% to 80%. Due to the different application requirements of continuous products, in recent years, the market has become increasingly demanding on the quality and variety of metal silicon products. In production practice, how to improve product quality and expand product varieties is a problem that every manufacturer must pay attention to. It is an inevitable measure to enhance the market competitiveness of enterprises, and at the same time, it is an important way to improve the economic benefits of enterprises. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/037
Inventor 林祖徳丁卫民周继红
Owner 怒江宏盛锦盟硅业有限公司
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