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Basic Chromium Sulfate
Reduction of hexavalent chromium Anhydrous sodium dichromate powder is reduced by 'burner gas' plant. Burner gas contains about 9% sulfur dioxide. The sodium dichromate is dissolved in water to make a strong solution which is pumped continuously over reaction towers filled with ceramic packings where it reacts with the sulfur dioxide bearing gas. Although the reaction is exothermic, steam injection is required to maintain the temperature and hence the reaction rate.
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