The details description of chrome sulphate application

Vishnu chrome is an inorganically reduced basic chromium sulphate complex in powder form. It is used in leather for chrome tanning of leather manufacture.
With excellent chromium penetration characteristics.Provides uniform chromium oxide distribution on the cross section and the grain of the leather.The product is dried with most sophisticated spray drier which does not allow material to be overheated. It is not toxic and has good solubility.
As chrome, particularly in the hexavalent oxidation state, is a toxic material, considerable attention was paid at the design stage in minimising emissions, both liquid and gaseous, from the plant. Emissions of chromium(chrome sulphate)from the plant stacks are monitored regularly, but are rarely at detectable levels. A condition of the plant air discharge permit is a requirement to continuously monitor sulfur dioxide emissions from the scrubber tower stack.
This compound is still freely water soluble. The sodium sulfate(Sodium Lauryl Ether Sulfate,SLES70%) shown on the right hand side of the equation is part of the product and is normally not separated, and merely remains as an inert diluent.
An excess of sulfur dioxide is required to ensure the chromium(chrome sulphate)is fully reduced to the +3 oxidation state. A second reaction tower is used to remove the residual sulfur dioxide. As well as the 33% basicity products, 42% and 50% basicity products are manufactured by the addition of soda ash solution. These products are masked by the addition of sodium formate, which alters the characteristics of the tanned leather.

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