A method for preparing silica sol by slurrying electrolysis of silicon micropowder

A technology of silica sol and silicon micropowder, which is applied to electrolysis components, electrolysis processes, cells, etc., can solve the problems of high environmental damage and high preparation cost, and achieve the effects of high utilization rate of raw materials, improved yield, and easy and controllable process operation.

Active Publication Date: 2019-12-20
MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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  • Abstract
  • Description
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  • 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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  • A method for preparing silica sol by slurrying electrolysis of silicon micropowder

Examples

Experimental program
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%, C6%, 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 in the electrolysis reaction device shown, adjust the initial pH of the mixed slurry to 12-14, and continue to stir and mix 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 reaction slur...

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] Take 500kg of silicon micropowder recovered in a silicon smelter (the test result of the main component of the 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 electrolytic reaction device shown, adjust the initial pH of the mixed slurry 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 temperature of ...

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] 600kg of silicon micropowder recovered in a certain chemical smelting plant (the detection result of the main components of the silicon micropowder is the same as that in Example 3), with a mass fraction of 30% sodium hydroxide solution, according to the solid-liquid ratio between the silicon micropowder and the sodium hydroxide solution Ratio: 10:1 mixing slurry, and pump the mixed slurry to such as figure 1 In the intermediate reaction chamber II of the electrolytic reaction device shown, adjust the initial pH of the mixed slurry to 12-15, and continue stirring and mixing under stirring conditions. At the same time, turn on the external electrolysis power supply, control the electrolysis voltage to 2.5-4.5V, and the current density to 350-650A / m 2 , The mixing tempera...

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Abstract

The invention discloses a method for preparing silica sol by slurrying and electrolyzing silicon micropowder. The method mixes and slurries silicon micropowder with an alkali solution, and uses a bipolar membrane electrolytic cell to separate the mixed slurry; the silicate ions in the mixed slurry pass through The anion exchange membrane enters the anode chamber, combines with the hydrogen ions generated by the anode electrolysis, and converts into a silicic acid solution; the cations in the mixed slurry enter the cathode chamber through the cation exchange membrane, and the hydroxide ions generated by the cathode electrolysis are mixed to obtain an alkaline solution ; Among them, as the concentration of silicic acid solution in the anode chamber increases, a silica sol is obtained; the alkali solution in the cathode chamber can be recycled for slurrying silicon micropowder. Compared with the traditional silica sol preparation method and silica powder recovery method, the method for preparing silica sol by slurrying and electrolysis of silica micropowder according to the present invention has ingenious overall process design, saves a lot of acid and alkali, no dust, acid and other pollution, and is easy to operate. It is highly efficient and environmentally friendly, and greatly increases the additional value of the overall recovery of silicon micropowder, and has high industrial application value.

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 a high content of silica (content>88%) collected by high temperature dust removal in the process of 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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