硫酸亚铁铵还原铬渣的实验研究

Experimental Study on Ammonium Ferrous Sulfate for Reduction of Chromium Slag

铬渣是重金属废渣的一种,其中水溶性六价铬和酸溶性六价铬的浸出,严重污染环境。湿法解毒是处理铬渣的一种重要手段,实验选用硫酸亚铁铵还原铬渣浸出液中的六价铬。研究结果表明,在酸性范围内,六价铬的还原效果最明显,硫酸亚铁铵的加入量为理论计算的1.234倍时,铬渣中浸出的六价铬最大程度地被还原。还原反应过程中pH、硫酸亚铁铵用量、反应时间对六价铬的转化率具有重要影响。

Chromium slag is a residue of heavy metals. Leaching of hexavalent chromium assorted with water-soluble and acid-soluble may seriously pollute the environment. Wet-method reducing is an important way to treat chromium slag. In the experiment, ferrous ammonium sulfate was used to restore the chromium leaching from the hexavalent chromium slag. The result expatiates that in the acidic range, the reduction effect of hexavalent chromium is very obvious, when the amount of ferrous ammonium sulfate put in is 1.234 times as more as the theoretical value, the leaching of hexavalent chromium can be reduced as strong as possible. During the reaction, pH, the amount of ferrous ammonium sulfate used and the reaction time exert an important influence upon the conversion of hexavalent chromium.