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Method for preparing white carbon black from secondary carbon component

A technology of secondary carbon and white carbon black, applied in the direction of silicon oxide, etc., can solve the problems of inability to produce qualified white carbon black products, and achieve the effects of fine particle size, convenient operation, and good whiteness

Active Publication Date: 2007-11-28
PINGSHUO INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned various methods require the use of sodium silicate solution with higher purity. The above experiments are all based on industrial-grade sodium silicate raw materials. When using sodium silicate with higher impurity content, the original carbon method It is impossible to produce qualified silica products at all

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Will contain 5.87g / L Fe 2 o 3 , 0.57g / L Al 2 o 3 , 9.79g / L TiO 2 21% Na 2 SiO 3 The solution was diluted to 10% Na 2 SiO 3 solution, placed in a carbon separator, heated to 75°C, and fed with CO 2 gas, stirred to make Na 2 SiO 3 When the pH value of the solution drops from >14 to 10.5, stop the aeration, filter and separate the precipitate in the solution, put the remaining liquid in the carbon separator, raise the temperature to 75°C, and pass in CO 2 The gas continues to separate carbon, and when the pH value of the solution drops to 8, stop the ventilation, and then filter and separate. The obtained solid isolate is washed and dried to obtain SiO 2 High-quality silica with a content of 98.5% and an average particle size of 10 μm.

[0024] Add 20% HCl solution to the precipitate from the first carbon separation, cook at 80°C for 2 hours, wash and dry to obtain SiO 2 High-quality white carbon black with a content of 99.6% and an average particle size of 10 ...

Embodiment 2

[0027] Dilute common industrial grade sodium silicate to 15% Na 2 SiO 3 solution, placed in a carbon separator, heated to 60°C, and fed with CO 2 Gas and stirring, when the pH value of the solution drops to 9.5, stop the ventilation, filter and separate the precipitate, and return the remaining liquid to the carbon separator for the second carbon separation, until the pH value of the solution drops to 7.5, Stop the ventilation, then filter and separate, and the precipitate is washed and dried to obtain SiO 2 High-quality silica with a content of 99.5% and an average particle size of 10 μm.

[0028] The precipitates from the first carbon separation were treated with 40% H 2 SO 4 The solution is boiled at 100°C for 2 hours, the insoluble matter is washed with water until neutral, and after drying, SiO can be obtained. 2 High quality silica with 99% content.

[0029] After the carbon residue is concentrated by causticizing evaporation, it is made into NaOH concentrated alka...

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Abstract

The twice carbon separating process for preparing silica white includes introducing CO2 gas to sodium silicate solution to lower the pH value to 9-10.5, solid-liquid separating, further introducing CO2 gas to the solution to lower the pH value to 7-8, solid-liquid separating, washing and stoving to obtain coarse silica while product, soaking or boiling in strong acid solution, washing and stoving to obtain silica while product. The present invention may have the sodium silicate solution obtained through soaking high silicon slag from producing aluminum sulfate, aluminum chloride, ferrous metal and non-ferrous metal and with high impurity content as the material, and the silica while product has high purity, fine granularity and high whiteness.

Description

technical field [0001] The invention relates to a preparation method of white carbon black, in particular to a preparation method of white carbon black utilizing carbon dioxide carbon content. The present invention can use sodium silicate solution with higher impurity content to prepare white carbon black. Background technique [0002] White carbon black is pure ultrafine silicon dioxide, which is acid-resistant, high-temperature resistant, and chemically stable. It is an important inorganic chemical raw material and is mostly used as a reinforcing filler. Due to the small size of silica particles and large specific surface area, the surface silanol groups and active silane bonds can form hydrogen bonds of varying strengths, so it has special properties such as good electrical insulation, hygroscopicity, extinction and dispersibility. , It has a wide range of uses in various fields such as rubber, paint, plastics, papermaking, ink, and daily chemicals. [0003] The methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/113
Inventor 秦晋国王佳东王海
Owner PINGSHUO INDAL
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