Method for preparing white carbon black by circularly using mother liquor

Abstract

The invention discloses a method for preparing white carbon black by circularly using mother liquor. The method comprises the following steps: a, 1000 parts by weight of sodium silicate solution with the concentration of 12 to 15% is taken, 100 to 120 parts by weight of sodium sulfate is added into the sodium silicate solution, and then mixing is performed fully and uniformly to obtain a mixed solution; b, a sulfuric acid solution with the concentration of 10 to 15% and a hydrochloric acid solution with the concentration of 10 to 12% are added into the mixed solution according to the volume ratio of 1:(1-1.2) to perform reaction until sodium silicate reacts completely; meanwhile, 0.1 to 0.2 part by weight of dimethicone and 0.03 to 0.05 part by weight of polysorbate 80 are added into the mixed solution in a dripping manner and then stirring is continuously performed at the speed of 1200 to 1500 revolutions per minute until sediment appears in the reaction system. According to the invention, since the mother liquor containing the sodium sulfate and the sodium chloride is reused, on one hand, the dispersity of the silicon dioxide is increased, and on the other hand, the discharged mother liquor is reduced; as dimethicone and polysorbate 80 are added, the dispersity of the silicon dioxide is increased, the polymerization of silica particles is performed slowly, the particle size of the white carbon black is reduced, and the specific surface area is increased.

Description

Technical field: [0001] The invention relates to the technical field of white carbon black preparation in the chemical industry, in particular to a method for preparing white carbon black by recycling mother liquor. Background technique: [0002] White carbon black is a light hydrated silica material, existing in the form of amorphous microporous powder, and is an important chemical product with a wide range of uses. Silica has a large specific surface area, usually greater than 130m 2 / g, powder particles have a large number of microporous structures, the surface is rich in hydroxyl groups, and have good adsorption, flame retardancy, insulation, suspension, vibration liquefaction, thixotropy, light scattering, surface graft modification and other characteristics, which significantly complement Strong action has gained important applications in the field of rubber product processing. [0003] The precipitation method is usually divided into sulfuric acid method and hydroc...

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Problems solved by technology

[0005] The present invention solves the problems of high degree of polymerization, large particle size, small specific surface area, and poor dispersibility in the white carbon black produced by the existing common precipitation process, and at the same time avoids the problems caused by the discharge of sodium sulfate wastewater generated in the sulfuric acid process. To solve the problem of environmental pollution, a method for preparing white carbon black by recycling mother liquor is provided