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Reaction process for precipitating white carbon black through stirring and milling method

A technology of precipitating white carbon black and stirring mill, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of unavoidable gelatinous hydrated silicon dioxide, increase production cost, etc., to simplify process equipment and steps, improve Feed rate, counteracting the effect of volume reduction

Inactive Publication Date: 2011-07-13
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formation of "white spots" is mainly related to the concentration of sodium silicate and sulfuric acid, and the mixing speed. Since the stirring speed of the equipment cannot be increased infinitely, it is not easy to solve the problem of "white spots" in China at present. The existing improved technology - input crystal seeds , Filtration of glue and other technologies only improve product quality, or screen out large particles of hydrated silica, but cannot avoid the formation of gel-like hydrated silica, and significantly increase production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A kind of reaction technique of stirring mill method precipitation white carbon black of the present embodiment adopts water glass and sulfuric acid to react, comprises reaction procedure and ripening procedure, and described reaction procedure is carried out in 5 liters of acid, water and stirred tank, Add ceramic ball mills in acid, water and stirring tank first, the density of ceramic ball mills is 1.8kg / m 3 , the outer surface is coated with a polyurethane plastic wrapping layer. It can also be coated with high-density polyethylene, a plastic wrap in polytetrafluoroethylene. Then add 1 liter of water glass diluted to a density of 1.1g / mL without adding bottom liquid, and a modulus of 3.2, start the stirring tank (10 times the motor power of the original stirring tank motor), and the stirring speed is 60 rpm Minutes, 30% sulfuric acid was evenly added dropwise within 5 minutes; ensure the end point pH of the reaction solution was 8-9. Then carry out the aging proce...

Embodiment 2

[0020] The reaction process of a kind of agitation grinding method precipitation white carbon black of the present embodiment comprises reaction process and ripening process, and its basic steps are identical with embodiment 1, difference: the density of ceramic ball mill is 1.6kg / m 3 The water glass adopts a density of 1.3g / mL and a modulus of 2.8; the acid adopts a concentration of 30% sulfuric acid, and the reaction terminal pH is 7-8 in the reaction process. Moreover, the aging process is not carried out in acid, water and stirring tank, and the material is discharged after the reaction. In addition, it is aged in another reactor at 80°C. The scraper test shows that the particle size of the product has a small upward trend, but it is finally made into white carbon. In addition to the small specific surface area of ​​black, no "white spots" were found; at the same time, it was found that the conventional curing process was compared with the same tank curing process in Exampl...

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Abstract

The invention discloses a reaction process for precipitating white carbon black through a stirring and milling method. Water glass is reacted with acid; and the reaction process comprises a reaction procedure and a curing procedure, wherein the reaction procedure is carried out in an acid and water neutralization stirred tank, and ceramic ball milling bodies are added into the acid and water neutralization stirred tank. In the reaction process, the stirring efficiency is greatly improved, and the generation of 'white spots' is radically stopped; moreover, the grain size is obviously reduced, so that the water glass with higher concentration can be reacted with the acid.

Description

technical field [0001] The invention relates to a reaction process for precipitating white carbon black by stirring and grinding. Background technique [0002] White carbon black is an important chemical raw material. The main production processes include silicon tetrachloride high-temperature hydrolysis method and sodium silicate acidification precipitation method. On the basis of sodium silicate method, sol method and carbonization method are also derived. The former is of good quality but the cost is high, while the latter is cheap but of poor quality, and there are often "white spots (agglomerated silica)" in the product, resulting in a significant decline in performance. The bulk silica product in China is precipitated silica. If the problem of white spots can be solved at low cost, the price of precipitated silica can be greatly increased. [0003] The acidic raw materials mainly used for precipitated white carbon black are sulfuric acid, hydrochloric acid and other s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 陈楷翰
Owner QUANZHOU NORMAL UNIV
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