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Preparation method for white carbon black

A technology of white carbon black and raw materials, applied in the direction of silica, silicon oxide, etc., can solve the problem of low quality of white carbon black products, achieve the effects of reducing imports, reducing burdens, and saving production costs

Active Publication Date: 2013-02-13
ZHUZHOU XINGLONG CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the technical problem in the prior art that diatomite is used to remove impurities from the raw material water glass, resulting in lower quality of the prepared white carbon black product, and provides a new white carbon black preparation method, which can effectively avoid the production of Secondary pollution of raw materials in the process, thereby improving product quality

Method used

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Examples

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preparation example Construction

[0013] The invention provides a kind of preparation method of white carbon black, comprises the following steps:

[0014] S1, water glass impurity removal: dissolve the water glass solid to obtain raw material crude liquid, then add white carbon black to the raw material crude liquid, obtain qualified water glass solution after filtering;

[0015] S2, synthesis of white carbon black: the water glass solution obtained in step S1 is mixed with concentrated sulfuric acid, and the crude product of white carbon black is obtained after the reaction;

[0016] S3. Purification of white carbon black: press-filter, wash, and beat the crude white carbon black product obtained in step S2, and obtain a finished white carbon black product after drying.

[0017] The inventors of the present invention have found that in the prior art, diatomaceous earth is used as the filter aid of water glass, and other impurities are easily introduced into the raw material water glass, resulting in a reduct...

Embodiment 1

[0029] Take by weighing 630Kg water glass and be mixed with the crude raw material liquid of 2.63mol / L. Under the state of stirring, add 2Kg white carbon black to the raw material crude liquid to remove impurities, the stirring speed is 20 rpm, stir for 30min, settle for 45min and filter to obtain a qualified water glass solution. Then this qualified water glass solution is added in the synthetic kettle, and the water glass solution reacts with the vitriol oil in the synthetic kettle, and the mass ratio of the water glass solution and the vitriol oil is SiO 3 2- : SO 4 2- =1.63:1, reacted at 90°C for 100 minutes, and obtained crude white carbon black after cooling. Pump the crude white carbon black product into a diaphragm filter press for filter press washing, control the feed pressure of the filter press within the range of 0.6Mpa, and then use 35°C water for multiple washings until the conductivity of the washing drainage is low at 2.0 ms / cm; then carry out the filter p...

Embodiment 2

[0032] Take by weighing 630Kg water glass and be mixed with the crude raw material liquid of 2.63mol / L. Under the state of stirring, add 2Kg white carbon black to the raw material crude liquid to remove impurities, the stirring speed is 20 rpm, stir for 30min, settle for 45min and filter to obtain a qualified water glass solution. Then this qualified water glass solution is added in the synthetic kettle, and the water glass solution reacts with the vitriol oil in the synthetic kettle, and the mass ratio of the water glass solution and the vitriol oil is SiO 3 2- : SO 4 2- =1.7:1, react at 90°C for 100 minutes, and obtain the crude product of white carbon black after cooling. Pump the crude white carbon black product into a diaphragm filter press for filter press washing, control the feed pressure of the filter press within the range of 0.6Mpa, and then use 35°C water for multiple washings until the conductivity of the washing drainage is low at 2.0 ms / cm; then carry out th...

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Abstract

The invention provides a preparation method for white carbon black. The preparation method comprises the following steps of: S1, removing impurities by sodium silicate: dissolving solid sodium silicate to obtain raw material crude liquid; adding the white carbon black into the raw material crude liquid; filtering mixture to obtain a qualified sodium silicate solution; S2, compounding the white carbon black: mixing the sodium silicate solution obtained in the step S1 with concentrated sulfuric acid; reacting the mixture obtain a white carbon black crude product; and S3, purifying the white carbon black: filter pressing, washing and pulping the white carbon black crude product obtained in the step S2, and drying the processed white carbon black crude product to obtain a white carbon black finished product. According to the preparation method for the white carbon black, the white carbon black is used for replacing diatomaceous earth to be used as a filter aid for removing the impurities by the sodium silicate; so that production cost is reduced and intake of other impurities and microelements can be reduced; load of a subsequent synthetic process is reduced, and quality of the white carbon black is improved.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a preparation method of white carbon black. Background technique [0002] White carbon black is also known as hydrated silica, and the current conventional production methods mainly include gas phase method and precipitation method. Among them, silica is mainly used as a reinforcing agent for silicone rubber, a thickener for coatings and unsaturated resins, a reinforcing agent for natural rubber and synthetic rubber, and a friction agent for toothpaste. [0003] Precipitation method is divided into traditional precipitation method silica and special precipitation method silica, the former refers to sulfuric acid, hydrochloric acid, CO 2 Silica produced with water glass as the basic raw material, the latter refers to the silica produced by special methods such as high gravity technology, sol-gel method, chemical crystal method, secondary crystallization method or reve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 周敏唐建强唐志凡彭令军唐任志张洁
Owner ZHUZHOU XINGLONG CHEM IND
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