Introduction of basic chrome sulphate

Basic chrome sulphate is mainly used for tanning leather, chromium hydroxide is the production of raw materials, dyes Industrial Chromium Sulphate production of reactive black dye, printing and dyeing industry as a mordant.

The production methods of basic chromium sulphate are mainly organic reduction and sulfur dioxide reduction. Sodium dichromate organic reduction mother liquor solution of sodium hydrogen sulfate (40 ~ 42 ° Bé) or sulfuric acid in a lead-lined or glass-lined reactor equipped with a stirrer with stirring, after acidification, the reducing agent is added slowly with stirring sucrose, the reduction of hexavalent chromium, the reaction solution was maintained at the end of boiling, is conducive to complete the reaction. The reaction product is viscous syrupy solution, add water, the solution concentration was adjusted to 40 ~ 42 ° Bé, first by natural cooling, then the cooling crystallizer chilled to below 10 ℃, so that part of sodium sulfate crystals to generate mirabilite, centrifugal separation, the system product liquid is obtained basic chromium sulfate, and then concentrated and dried to obtain a solid product of basic chromium sulfate.

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