Method for preparing white carbon black by taking rice hull ash as raw material

Abstract

The invention relates to a method for preparing white carbon black by taking rick hull ash as a raw material, comprising the following steps of: (a) dissolving and boiling the rice hull ash processed by a sieve with 40 meshes and an NaOH (sodium hydroxide) solution of 1.5-3.5mol / L at a temperature of 90-110 DEG C for 1 hour to 6 hours, wherein the ratio of the rice hull ash to the NaOH solution is 1g:(8-10) mL, cooling and filtering; (b) mixing a filter liquid, 95% ethanol and a surfactant in terms of the ratio of the filter liquid to the 95% ethanol to the surfactant being 1:(8-10):(0.1-0.3), regulating the temperature of a mixture to be 35-45 DEG C, and adding an ammonium chloride solution into the mixture in terms of the mass ratio of the mixture to the ammonium chloride solution with the mass concentration of 20-30% being 1:(0.1-0.3) under a state of stirring; (c) washing a turbid material, suction-filtering, ageing by using a proper amount of the ethanol with the mass fraction of 95% for 2 hours to 5 hours, standing, filtering, and washing and filtering by using the 95% ethanol to obtain a filter cake; and (d) stoving the filter cake, placing in a muffle furnace for roasting at a temperature of 450-600 DEG C for 1 hour to 6 hours to obtain white granular silicon dioxide, and grinding the white granular silicon dioxide to obtain the globular white carbon black. The method has the advantages of low production cost and simple operation, and is easy to control the condition and expand the production.

Description

technical field [0001] The invention relates to a method for preparing white carbon black, in particular to a method for preparing white carbon black by thermally decomposing raw materials of rice husk ash. Background technique [0002] Silica superfine powder is a light amorphous solid material, because of its strong reinforcement, large specific surface area, small density and good dispersion, it is not only used in the electronics industry, aerospace technology and new catalyst carriers, etc. It has been applied in high-tech fields, and it is also widely used in high-grade transparent toothpaste, high-grade rubber, synthetic resin, plastics, ink and high-grade coatings. one. At present, the domestic production of white carbon black, first, adopts the process route of gas phase method, and uses silicon tetrachloride gas to hydrolyze under the high temperature of hydrogen-oxygen flow to obtain smoky silica. The raw materials used are expensive and the process is complicate...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing white carbon black with rice husk ash as a raw material. The white carbon produced by the method has high blackness and small particle size, and overcomes the difficult control of particle size in the prior art. The preparation equipment Many, high requirements, high cost, high energy consumption, complicated technology, heavy pollution, etc.