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Method for preparing silica solution by pulping and electrolyzing silica powder

A technology of silica sol and silica powder, which is applied in the direction of electrolysis process, electrolysis components, cells, etc., can solve the problems of high production cost and great environmental hazards, and achieve high raw material utilization rate, increased yield, and simple and easy-to-control process operation Effect

Active Publication Date: 2018-10-30
MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the current preparation methods of silica sol include silicon dissolution method, ion exchange method, peptization method, dispersion method, peptization method and other methods. The above methods all need to add a large amount of acid or alkali solution, or other auxiliary chemical reagents, and the preparation cost High and harmful to the environment

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  • Method for preparing silica solution by pulping and electrolyzing silica powder

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Comparison scheme
Effect test

Embodiment 1

[0047] combine as figure 1 In the shown bipolar membrane electrolyzer device, this embodiment provides a method for preparing silica sol by slurrying and electrolyzing silicon micropowder, including:

[0048] 1000kg of silicon micropowder recovered in a silicon smelter (the test result of the main component of the silicon micropowder is: SiO 2 92%, C 6%, Fe 2 o 3 1.1%, MgO0.1%, CaO 0.1%), with a mass fraction of 30% sodium hydroxide solution, according to the solid-liquid ratio between silicon micropowder and sodium hydroxide solution: 3-6:1 mixed slurry, and Pump the mixed slurry to figure 1 In the intermediate reaction chamber (II) of the shown electrolytic reaction device, adjust the initial pH of the slurry after mixing to 12-14, and continue stirring and mixing under stirring conditions. At the same time, turn on the external electrolysis power supply, control the electrolysis voltage to 2.5-5V, and the current density to 350-800A / m 2 , The mixing temperature of the ...

Embodiment 2

[0051] combine as figure 1 In the shown bipolar membrane electrolyzer device, this embodiment provides a method for preparing silica sol by slurrying and electrolyzing silicon micropowder, including:

[0052] Get 500kg of silicon micropowder reclaimed in a silicon smelter (the test result of the main component of this silicon micropowder is: SiO 2 90%, C8%, Fe 2 o 3 1.1%, MgO0.1%, CaO 0.1%), with a mass fraction of 30% sodium hydroxide solution, according to the solid-liquid ratio between silicon micropowder and potassium hydroxide: 1-5:1 mixed slurry, and After mixing, the slurry is pumped to figure 1 In the intermediate reaction chamber (II) of the shown electrolysis reaction device, adjust the initial pH of the slurry after mixing to 10-12, and continue stirring and mixing under stirring conditions. At the same time, turn on the external electrolysis power supply, control the electrolysis voltage to 3.5-4.5V, and the current density to 450-600A / m 2 , The mixing tempera...

Embodiment 3

[0055] combine as figure 1 In the shown bipolar membrane electrolyzer device, this embodiment provides a method for preparing silica sol by slurrying and electrolyzing silicon micropowder, including:

[0056] 800kg of silicon micropowder recovered in a silicon smelter (the test result of the main component of the silicon micropowder is: SiO 2 89%, C8%, Fe 2 o 3 2.1%, MgO1.1%, CaO 0.1%), with a mass fraction of 30% potassium hydroxide solution, according to the solid-liquid ratio between silicon micropowder and sodium hydroxide: 6-8:1 mixed slurry, and After mixing, the slurry is pumped to figure 1 In the intermediate reaction chamber (II) of the shown electrolysis reaction device, adjust the initial pH of the slurry after mixing to 14-16, and continue stirring and mixing under stirring conditions. At the same time, turn on the external electrolysis power supply, control the electrolysis voltage to 4.5V, and the current density to 750A / m 2 , The mixing temperature of the r...

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Abstract

The invention discloses a method for preparing silica solution by pulping and electrolyzing silica powder. The method comprises the following steps of: mixing silica powder with aqueous alkali, pumping the mixture and separating the mixed pulp by utilizing a bipolar membrane electrolytic cell; enabling silicate ions in the mixed pump to enter an anode chamber through an anion-exchange membrane, and combining the silicate ions with hydrogen ions generated with anode electrolysis to obtain a silicic acid solution; enabling cations in the mixed pump to enter a cathode chamber through a cation exchange membrane, and combining the cations with hydroxyl generated by cathode electrolysis to obtain aqueous alkali; and obtaining the silica solution along with the concentration increase of the silicic acid solution in the anode chamber, wherein the aqueous alkali in the cathode chamber can be circularly used for silica powder pulping. Compared with traditional silica solution preparation methodsand silica powder recovery methods, the method for preparing the silica solution by pulping and electrolyzing silica powder is ingenious in overall process design, free of pollution of dust and acid,simple and convenient to operate, efficient, environmentally friendly and high in industrial application value, and is capable of greatly saving acid and alkali and greatly improving the overall recovery and additional utilization values of the silica powder.

Description

technical field [0001] The invention relates to a technology for recovering silicon micropowder and preparing silica sol, in particular to a method for preparing silica sol by slurrying and electrolyzing silicon micropowder. Background technique [0002] Microsilica powder is fine light solid dust with high content of silica (content>88%) collected by high temperature dust removal during industrial smelting of metal silicon or ferrosilicon. At present, the smelting of 1000kg of ferrosilicon and 1000kg of industrial silicon will produce 300-500kg of microsilicon powder waste respectively, and the microsilicon powder that can be collected through dust removal equipment in my country accounts for one-third of the total annual output. The collected microsilica powder is usually disposed of in the form of stacking, which not only causes a large area of ​​land waste, but also easily forms dust during stacking and storage, which greatly damages the entire production workshop and...

Claims

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Application Information

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IPC IPC(8): C25B1/00C25B9/08C25B9/19
CPCC25B1/22C25B9/19
Inventor 赵林龙泽彬赵澎
Owner MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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