Abstract
CaCl2 was generally used as dephosphorizing agent during the sodiumization-vanadium extraction process. However, a large number of chloride ions were brought into wastewater from vanadium precipitation, which increased the corrosion of the evaporation-concentration equipments of wastewater treatment. Then, the chloride-free dephosphorizing agent (CFDA) was developed, and the dephosphorizing effect was compared with that of CaCl2. The results showed that, with the chloride-free dephosphorizing agent, the dephosphorizing ratio≥99 %, clarification time of 120 min, vanadium loss≤3.5 %, and vanadate leaching solution dephosphorized by the CFDA could meet the demand of high density vanadium precipitation.
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