Method for preparing white carbon black from secondary carbon component

Abstract

The twice carbon separating process for preparing silica white includes introducing CO2 gas to sodium silicate solution to lower the pH value to 9-10.5, solid-liquid separating, further introducing CO2 gas to the solution to lower the pH value to 7-8, solid-liquid separating, washing and stoving to obtain coarse silica while product, soaking or boiling in strong acid solution, washing and stoving to obtain silica while product. The present invention may have the sodium silicate solution obtained through soaking high silicon slag from producing aluminum sulfate, aluminum chloride, ferrous metal and non-ferrous metal and with high impurity content as the material, and the silica while product has high purity, fine granularity and high whiteness.

Description

technical field

[0001] The invention relates to a preparation method of white carbon black, in particular to a preparation method of white carbon black utilizing carbon dioxide carbon content. The present invention can use sodium silicate solution with higher impurity content to prepare white carbon black. Background technique

[0002] White carbon black is pure ultrafine silicon dioxide, which is acid-resistant, high-temperature resistant, and chemically stable. It is an important inorganic chemical raw material and is mostly used as a reinforcing filler. Due to the small size of silica particles and large specific surface area, the surface silanol groups and active silane bonds can form hydrogen bonds of varying strengths, so it has special properties such as good electrical insulation, hygroscopicity, extinction and dispersibility. , It has a wide range of uses in various fields such as rubber, paint, plastics, papermaking, ink, and daily chemicals.

[0003] The methods...