After dissolving 98% potassium dichromate and 98% sulfuric acid in the mother liquor of chromium alum according to the theoretical amount, wood chips were added slowly under stirring for reduction. The reaction temperature is controlled at not more than 80C. After the reaction, it is left to crystallize slowly, and after centrifugal separation of the mother liquor, the crystals are washed with a small amount of cold water, and then dried at a low temperature to produce the finished product of chromium potassium sulfate. The reaction formula is as follows:
2K2Cr2O7+8H2SO4+40H2O+3C4KCr(SO4)2-21H2O+3CO2
