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A method for preparing high-purity silicon dioxide from silicon slag

A high-purity silicon dioxide and silicon slag technology, applied in the direction of silicon dioxide and silicon oxide, can solve the problems of waste of resources, loss of silicon and silicon dioxide, etc., solve environmental problems, create economic value, and realize waste utilization Effect

Active Publication Date: 2020-04-21
CHENGDU SILICON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the traditional organic silicon slag treatment process will lose a large amount of silicon and silicon dioxide, resulting in waste of resources. The present invention provides a method for preparing high-purity silicon dioxide by using silicon slag to solve the above problems. The method makes full use of the waste organic silicon slurry in the production process of organic silicon as raw material to obtain high-purity silicon dioxide, realizes waste utilization, and is economical and environmentally friendly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing high-purity silicon dioxide by using silicon slag, the specific operation is: in an open container in contact with air, under the condition of constant stirring, dropwise add sodium hydroxide solution to the organic silicon slag slurry for dissolution reaction, The stirring speed is 90r / min, the concentration of sodium hydroxide is 35%, and the reaction liquid-solid ratio is 10:1; continue to react for 2 hours after the dropwise addition, and the reaction temperature is 80°C. After the reaction is completed, filter to obtain SiO 2 Sodium metasilicate solution with a concentration of 55g / L; add CaO to the sodium metasilicate solution to purify and remove impurities, the amount of CaO added is 8g / L sodium metasilicate solution, the reaction time is 2h, the reaction temperature is 80°C, After completion, filter to obtain the purified sodium metasilicate solution; under ultrasonic conditions, add the purified sodium metasilicate solution evenly to the ...

Embodiment 2

[0026] A method for preparing high-purity silicon dioxide by using silicon slag, the specific operation is: in an open container in contact with air, under the condition of constant stirring, dropwise add sodium hydroxide solution to the organic silicon slag slurry for dissolution reaction, The stirring speed is 90r / min, the concentration of sodium hydroxide is 50%, and the reaction liquid-solid ratio is 3:1; after the dropwise addition, continue to react for 5h, the reaction temperature is 50°C, and after the reaction is completed, filter to obtain SiO 2 Sodium metasilicate solution with a concentration of 65g / L; add CaO to the sodium metasilicate solution to purify and remove impurities, the amount of CaO added is 10g / L sodium metasilicate solution, the reaction time is 0.5h, and the reaction temperature is 90°C. After the reaction is completed, filter to obtain the purified sodium metasilicate solution; under ultrasonic conditions, add the purified sodium metasilicate soluti...

Embodiment 3

[0028] A method for preparing high-purity silicon dioxide by using silicon slag, the specific operation is: in an open container in contact with air, under the condition of constant stirring, dropwise add sodium hydroxide solution to the organic silicon slag slurry for dissolution reaction, The stirring speed is 90r / min, the concentration of sodium hydroxide is 45%, and the reaction liquid-solid ratio is 6:1; continue to react for 3h after the dropwise addition, the reaction temperature is 65°C, and filter to obtain SiO 2 Sodium metasilicate solution with a concentration of 60g / L; add CaO to the sodium metasilicate solution to purify and remove impurities, the amount of CaO added is 9g / L sodium metasilicate solution, the reaction time is 1.5h, and the reaction temperature is 85°C. After the reaction is completed, filter to obtain the purified sodium metasilicate solution; under ultrasonic conditions, add the purified sodium metasilicate solution evenly to the sodium carbonate s...

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Abstract

The invention discloses a method of preparing highly pure silicon dioxide from silicon slag. The method comprises following steps: step one, adding a sodium hydroxide solution into organic silicon slurry to dissolve organic silicon, and filtering the solution to obtain a sodium metasilicate solution; step two, adding the sodium metasilicate solution prepared in the step one into a sodium carbonatesolution, introducing CO2 into the solution to carry out carbonization decomposition, and after reactions, carrying out solid-liquid separation to obtain metasilicic acid precipitates and sodium carbonate precipitates; and step three, washing the metasilicic acid precipitates prepared in the step two by acid and water, and drying the precipitates to obtain highly pure silicon dioxide. The waste namely organic silicon slurry, which is generated during the organic silicon production process, is taken as the raw material to produce highly pure silicon dioxide, the wastes are utilized, and the method is economic and environmentally-friendly.

Description

technical field [0001] The invention relates to the technical field of silicon smelting, in particular to a method for preparing high-purity silicon dioxide from silicon slag. Background technique [0002] In the production process of organosilicon chemical products such as methylchlorosilane, phenylchlorosilane, etc., organosilicon monomer is the main raw material, copper powder or copper salt is used as catalyst, unreacted silicon powder and catalyst and some organic The mixture of silicon is called organosilicon slurry, which contains a considerable amount of silicon powder, silicon dioxide and other impurities, which has a high recovery value. If it is directly buried, it will not only cause serious environmental pollution, but also cause loss A large amount of silicon and silicon dioxide cause a great waste of resources. With the continuous expansion of the production scale of organic silicon, the amount of organic silicon slurry continues to increase, and how to effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12
CPCC01B33/12C01P2006/80
Inventor 羊实周旭
Owner CHENGDU SILICON TECH CO LTD