Purpose:
Basic chromic sulfate is mainly used for tanning leather . Raw material for the production of chromium hydroxide . Industrial dye used in the production of reactive black dye . Printing and dyeing industry as a mordant .
Preparation :
Basic chromic sulfate production methods 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 . Its
8Na2Cr2O7 +48 NaHSO4 + C12H22Ol1 → 16Cr (OH) SO4 +32 Na2SO4 +43 H2O +12 CO2 ↑
8Na2Cr2O7 +24 H2SO4 + C12H22O11 → 16Cr (OH) SO4 +8 Na2SO4 +27 H2O +12 CO2 ↑
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