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Industrial fluosilicic acid purification and white carbon black co-production method

A technology of fluosilicic acid and white carbon black, applied in the direction of silicon oxide, silicon dioxide, silicon halide compounds, etc., can solve the problems of low industrial application value, high energy consumption, low decomposition rate, etc., and achieve a wide range of market and application value , low energy consumption and high resource utilization

Active Publication Date: 2015-08-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the reaction process needs to consume a large amount of expensive potassium hydroxide, and the decomposition reaction of potassium fluorosilicate requires high-temperature roasting, resulting in high energy consumption, low decomposition rate, and low industrial application value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Get 500L of fluorosilicic acid waste liquid from a phosphate fertilizer factory produced by A (the concentration of fluorosilicic acid is 3.2M, and the concentration of hydrofluoric acid is 0.2M), silica powder: 65Kg (the purity of silicon dioxide is 98%). The specific implementation process is as follows:

[0053] 1) Filtrating the fluorosilicic acid waste liquid to remove floating impurities, etc.;

[0054] 2) Mix 50.0L of fluorine-containing silicic acid waste liquid and 6.5Kg of silica powder evenly, and fully react at a stirring speed of 60r / min, so that the hydrogen fluoride contained in fluorosilicic acid is converted into fluorosilicic acid.

[0055] 3) Add the mixture reacted in step 2 into the reaction kettle, heat and decompose it, the reaction temperature is 75°C, keep constant temperature and continuous stirring, the stirring speed is 120 rpm, and the reaction time is controlled for 8 hours, at this time silicon tetrafluoride gas is obtained .

[0056] 4)...

Embodiment 2

[0060] Get 100L of fluorosilicic acid waste liquid from a hydrofluoric acid factory (the concentration of fluorosilicic acid is 2.7M, and the concentration of hydrofluoric acid is 1.1M), silica powder: 13Kg (the purity of silicon dioxide is 98%). The specific implementation process is as follows:

[0061] 1) Filtrating the fluorosilicic acid waste liquid to remove floating impurities, etc.;

[0062] 2) Mix 100L of fluorine-containing silicic acid waste liquid and 13Kg of silica powder evenly, stir at a speed of 50r / min, and fully react for 60min to fully convert hydrogen fluoride in the fluorosilicic acid solution into corresponding fluorosilicic acid.

[0063] 3) Add the solid-liquid mixture reacted in step 2 into the reaction kettle to heat and decompose. The reaction temperature is 70° C., the stirring speed is 150 rpm, and the reaction time is controlled for 9 hours to obtain silicon tetrafluoride gas.

[0064] 4) The silicon tetrafluoride gas generated in step 3 is absor...

Embodiment 3

[0068] Get 100L of fluorine-containing silicic acid waste liquid from a phosphate fertilizer factory (the concentration of fluorosilicate is 2.7M, and the concentration of hydrofluoric acid is 1.1M), silica powder: 10Kg (purity of silicon dioxide is 98%), add the white powder obtained in Example 2 2 kilograms of carbon black (converted to silicon dioxide with a purity of 99.2%) was used as a raw material. The specific implementation process is as follows:

[0069] 1) Filter the fluorine-containing silicic acid waste liquid to remove floating impurities, etc.

[0070] 2) Put 10 kilograms of silica powder and 2 kilograms of white carbon black into 100 L of fluorine-containing silicic acid waste liquid and mix evenly. The stirring speed is 60 r / min, and fully react for 50 minutes, so as to remove hydrogen fluoride in the silicofluoric acid solution, and Regenerate it to the corresponding fluosilicic acid.

[0071] 3) Add the reacted mixture in step 2 into the reaction kettle, h...

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PUM

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Abstract

An industrial fluosilicic acid purification and white carbon black co-production method belongs to the technical field of inorganic acid chemical production and purification. The method comprises the following steps: contacting an industrial fluosilicic acid solution with silica powders and carrying out heating, and collecting silicon tetrafluoride gas obtained after heating; absorbing the obtained silicon tetrafluoride gas directly by absorption liquid, and carrying out hydrolysis reaction to obtain a mixture of a fluosilicic acid solution and hydrated silicon dioxide solid; and separating the mixture to obtain the fluosilicic acid solution and the hydrated silicon dioxide solid. The method does not waste fluorine atoms in the purification process, and thus application range and additional value of the industrial fluosilicic acid are improved.

Description

technical field [0001] The invention belongs to the technical field of chemical production and purification of inorganic acids. Specifically, the invention relates to a treatment method for obtaining more pure fluosilicic acid and white carbon black through the combined reaction of industrial fluosilicic acid and silica powder. Background technique [0002] Fluorosilicic acid is also called silicofluoric acid, the molecular formula of fluorosilicic acid: H 2 SiF 6 , the molecular weight is 144.09, and the highest content of its aqueous solution is 60.92%. It is a colorless and transparent fuming liquid with a relative density of about 1.32 and a boiling point of 108.5°C. It is a medium-strong acid with a pungent odor and is easily volatile. . Dilute fluosilicic acid solution has certain disinfection properties, and is often used in the disinfection of beer and other fields. Fluosilicic acid can be hydrolyzed to produce a certain concentration of hydrofluoric acid during s...

Claims

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Application Information

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IPC IPC(8): C01B33/10C01B33/12
Inventor 潘军青国天骄张轩孙艳芝
Owner BEIJING UNIV OF CHEM TECH
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