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Method for preparing high-purity silica fume and application of silica fume

A micro-silicon fume, high-purity technology, applied in the direction of silicon oxide, silicon dioxide, coating, etc., can solve the problems of micro-silicon fume difficult to sell, low selling price, and high transportation and logistics costs

Inactive Publication Date: 2018-07-20
云南永昌硅业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many remote mountainous areas in my country's industrial silicon production enterprises, and there are no related industries that can use a large amount of micro-silica fume as an additive nearby. As a result, micro-silica fume is difficult to sell due to the impact of freight costs. A large amount of micro-silica fume accumulates, causing pollution to the environment and also It takes a lot of money to maintain the management of micro-silicon fume. Therefore, micro-silicon fume has the characteristics of low external sales price and high transportation and logistics costs.

Method used

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  • Method for preparing high-purity silica fume and application of silica fume

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Put the silica fume with a silicon dioxide content of 90wt% into the container, add dilute sulfuric acid with an acid content of 15g / L, adjust the solid-liquid ratio to 1:2, keep the temperature at 60 degrees Celsius, stir for 1 hour and then let it stand for 1- 2 hours; after standing still, the metal impurities in the silica fume are dissolved in the pickling solution, and the carbon contained in the silica fume floats on the upper layer at the same time, first remove the floating carbon, and then filter the silica fume after standing , during the filtration process, clean the silica fume with water for 1-3 times, so as to reduce the S content in the micro silica fume after pickling; finally put the filtered micro silica fume into an oven at 105 degrees Celsius to dry, dry Afterwards, it was finely ground with a vibrating mill, and the content of silicon dioxide obtained by sampling and testing was 96wt%.

Embodiment 2

[0039] Raise the temperature of the muffle furnace to a constant temperature of 650 degrees Celsius, then put the microsilica powder with a silica content of 90wt% into a corundum crucible, and put it into the muffle furnace for calcination for 1 hour; the calcined microsilica powder is cooled and tested , the carbon dioxide content is 96wt% and the whiteness is obviously improved.

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Abstract

The invention discloses a method for preparing high-purity silica fume and an application of the silica fume. The method comprises steps as follows: the silica fume is treated with a wet-process upgrading or pyrogenic-process upgrading method to obtain the high-purity silica fume with the content of silica not smaller than 95%. The method adopts a simple process and can effectively remove impurities in the silica fume and increase the whiteness and the content of silica, and the high-purity silica fume with the content of silica larger than 95% is obtained. The high-purity silica fume has higher additional value, can be applied to multiple fields and thus has great significance in sustainable development of the silicon industry.

Description

technical field [0001] The invention belongs to the field of comprehensive recycling of waste products, in particular, the invention relates to a method for preparing high-purity micro-silicon powder and its application. Background technique [0002] Micro silica fume is SiO produced in the process of silicon smelting 2 and Si gas with O in air 2 An ultrafine siliceous powder material formed by rapid oxidation and condensation, generally used as an additive, but in a small amount. There are many remote mountainous areas in my country's industrial silicon production enterprises, and there are no related industries that can use a large amount of micro-silica fume as an additive nearby. As a result, micro-silica fume is difficult to sell due to the impact of freight costs. A large amount of micro-silica fume accumulates, causing pollution to the environment and also It takes a lot of money to maintain the management of micro-silicon fume. Therefore, micro-silicon fume has the ...

Claims

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Application Information

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IPC IPC(8): C01B33/12C09D7/61
CPCC01B33/12C01P2006/80
Inventor 文建华赵兴凡康万福张忠益任承伟李巧张藜
Owner 云南永昌硅业股份有限公司
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