Method for preparing nano-scale white carbon black product

Abstract

The invention discloses a method for preparing a nano-scale white carbon black product, comprising the following steps of: regulating the PH value of 3-15% ammonium fluosilicate at 15-50 DEG C to a range of 6-7 by using an alkaline dispersion phase or continuous phase substance; and then feeding the ammonium fluosilicate into a micro-reactor, adding the alkaline dispersion phase or continuous phase substance into the micro-reactor with excess of 10-30%, staying for 1-3 seconds, and then keeping the temperature in the micro-reactor at 15-50 DEG C, thereby obtaining a solid-liquid mixture; filtering the solid-liquid mixture so as to obtain the solid part, namely the nano-scale white carbon black; washing the nano-scale white carbon black by using water until the mass percent content of fluoride is less than 0.05%, thereby obtaining semi-finished product nano-scale white carbon black; and feeding the semi-finished product nano-scale white carbon black into a microwave drier for drying until meeting the international standard, thereby obtaining the product nano-scale white carbon black. The method provided by the invention is short in reaction time, low in reaction temperature and low in energy consumption; and the particle sizes of the generated particles are evenly distributed.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of a nano-scale white carbon black product. [0002] Background technique [0003] The preparation methods of nano-scale silica mainly include precipitation method and sol-gel method. The sol-gel method uses organic alcohol silicate as raw material, which is expensive and its production cost is very high. Due to the difficulty in controlling the formation and growth rate of silica crystal nuclei in the precipitation method, the particle size distribution of the obtained silica product is wide and the product quality is low. Chinese patent 200310117210 discloses a "preparation method of nano-silicon dioxide", using an alkali metal silicate solution as a raw material, adding a water-soluble polymer or a water-soluble organic alcohol to the solution, raising the temperature, and then adding an organic carboxylic acid to prepare a nano-scale For sili...

AI Technical Summary

Problems solved by technology

The sol-gel method uses organic alcohol silicate as raw material, which is expensive and its production cost is very high

Precipitation method is difficult to control the generation and growth rate of silica crystal nuclei, and the particle size distribution of the obtained silica product is wide, and the product quality is low

Chinese patent 200310117210 discloses a "preparation method of nano-silica", which uses an alkali metal silicate solution as a raw material, adds a water-soluble polymer or a water-soluble organic alcohol to the solution, raises the temperature, and then adds an organic carboxylic acid to prepare a nano-scale Silica, in the preparation process, surfactants are used to control the particle size of silica, and the process wastewater contains organic matter, which is difficult to treat

Chinese patent 200710066136.2 discloses "method for producing high-reinforcing white carbon black and high-concentration ammonium fluoride by ammoniation of fluorosilicate", adding ammonia water to fluorosilicate solution step by step, and then reacting, filtering, washing and drying. Silica products, the particle size of the product is large, can not meet the quality requirements of nano-scale silica

In the process of preparing raw material ammonium fluorosilicate, the existing technology mostly adopts continuous feeding to dissolve fluorine-containing silicon slag to prepare ammonium fluorosilicate. Since the dissolution reaction of fluorine-containing silicon slag is a slow reaction, continuous dissolution will make silicon It is difficult to completely dissolve the slag, and it takes a long time to dissolve

At the same time, in ordinary reactors, the reaction substances are not mixed uniformly, resulting in coarse and uneven particles of white carbon black products, which are prone to agglomeration, and are prone to amplification effects during industrial production.