Method for preparing high-purity white carbon black from silicon-containing raw material

Abstract

The invention discloses a method for preparing high-purity white carbon black from a silicon-containing raw material. The method specifically comprises the following steps: sufficiently stirring and uniformly mixing the silicon-containing raw material and sodium hydroxide to obtain a mixed raw material; carrying out oxidization roasting on the mixed raw material; then carrying out high-pressure leaching and filtering to obtain filtrate; diluting the filtrate with pure water to obtain high-purity sodium silicate; adding a chemical agent into the high-purity sodium silicate; and carrying out deposition, filtering and drying to, and calcining to obtain the high-purity white carbon black. The method disclosed by the invention comprises two processes of preparing the high-purity sodium silicateand preparing the white carbon black; sulfuric acid is not used in a whole process, so that the method is more environmentally friendly; the method has the advantages of novel route, great raw material selectivity and compact preparation technology; and the white carbon black prepared by the method has the advantages of extremely high purity, extremely stable quality and controllable impurity variety and content.

Description

technical field [0001] The invention belongs to the technical field of chemical production technology and material preparation, and in particular relates to a method for preparing high-purity white carbon black from silicon-containing raw materials. Background technique [0002] Silica is a general term for white powdery amorphous silicic acid and silicate products, which is a porous substance, and its composition can be used SiO 2 ·nH 2 O means, where nH 2 O is present in the form of surface hydroxyl groups. Soluble in caustic alkali and hydrofluoric acid, insoluble in water, solvents and acids (except hydrofluoric acid). High temperature resistance, non-flammable, odorless, odorless, with good electrical insulation. [0003] Silica has a wide range of uses, and can be used as a reinforcing agent for natural rubber and synthetic rubber, toothpaste friction agent, etc. It can also be used as an environmental-friendly and excellent additive, mainly used in the fields of ...

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Problems solved by technology

[0004] Patent application number 201410700622.5 discloses a method for preparing white carbon black, which uses albite decomposition, gas absorption hydrolysis, ammonolysis, crude and refined white carbon black to obtain white carbon black, but this method can be used The raw material is relatively single, ammonia gas needs to be added in the reaction process, the production cost is high, and the environmental pollution problem of ammonium fluoride in the product is more prominent

The patent application number is 201210476263.0, which discloses a preparation method of white carbon black and white carbon black. This method needs to add concentrated sulfuric acid to dehydrate the water glass, then add water to it for washing, concentrate and filter, and dry to obtain white carbon black. One method, because the raw materials are not processed in this method, the quality of the product is extremely unstable, and the type and content of impurities are difficult to control. Water glass with different raw materials will get white carbon black with different impurity elements, which has a great impact application of silica