Ferrous sulfate is used as a reducing chromium reducing agent to reduce soluble hexavalent chromium to low-toxic trivalent chromium . Combined with the characteristics of cement, ferrous sulfate is more suitable as a reducing agent for soluble hexavalent chromium in cement. It has the advantages of low price, low toxicity and good reducibility.
Ferrous sulfate monohydrate
Next we will understand the reduction effect of ferrous sulfate, determine the dosage and dosage, and its impact on the performance of cement, and finally form a complete technical application plan for reduction of chromium.
During the reducing agent addition stage, the cement output is 150t/h. The reducing agent is added at 0.12t/h. Adding 0.08% ferrous sulfate before grinding can reduce the water-soluble hexavalent chromium in the cement by 5.98mg/kg. Adding it after grinding The water-soluble hexavalent chromium in the cement can be reduced by 7.53 mg/kg. The reduction effect after grinding is better than that before grinding. This is mainly because ferrous sulfate is partially oxidized in the high temperature environment before grinding, reducing the reduction effect.
maintains a cement output of 150t/h, and the production operation record is basically stable before and after adding ferrous sulfate reducing agent. At the same time, the cement fineness index does not fluctuate much, and the specific surface area remains at 390±10dm2/kg. Therefore, it can be seen that the ferrous sulfate reducing agent has basically no impact on the cement production process.
