Process for producing sodium sulfate and ammonium sulfate from vanadium extraction waste residues

• Main Authors: TIAN XUFENG, PENG SAIJUN, LIU SHAOSHAN
• Format: Patent
• Language: Chinese; English
• Published: 02.03.2021
• Subjects: AMMONIA; CHEMISTRY; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; COMPOUNDS THEREOF; CYANOGEN; INORGANIC CHEMISTRY; METALLURGY

A process for producing sodium sulfate and ammonium sulfate from vanadium extraction waste residues comprises the following steps of: (1) adding water to dissolve vanadium extraction waste residues serving as raw materials, and carrying out solid-liquid separation to obtain ammonium nitrate brine and first waste sludge; (2) respectively adding sulfuric acid, caustic soda or lime and soda ash or sodium sulfide into the ammonium nitrate brine, carrying out chemical reaction, and separating to obtain ammonium nitrate brine refined solution and second waste sludge; (3) performing high-temperatureevaporation separation on the ammonium nitrate brine refined solution to obtain a sodium sulfate product and nitrate preparation mother liquor; (4) performing low-temperature evaporation separation onthe nitrate preparation mother liquor to obtain an ammonium sulfate product and ammonium preparation mother liquor; and (5) circulating the ammonium preparation mother liquor to the step (3) for high-temperature evaporation a