锌浸出渣挥发锌铅铟试验研究

Study on Volatilization of Zinc,Lead and Indium from Zinc Leaching Residue

回转窑挥发法是处理锌浸出渣的成熟工艺,针对某湿法炼锌浸出渣开展还原挥发锌、铅、铟试验研究。结果表明,锌浸渣中的物相主要为铁酸锌,在煤配比30%、挥发温度1150℃、挥发1 h的条件下,锌、铅和铟的挥发率分别为99.92%、99.59%和83.46%,窑渣含锌、铅和铟分别为0.025%、0.027%和0.013%。窑渣磁选回收铁,再浮选回收碳、铜和银,尾渣可以作为水泥和砖等建材原料。

Rotary kiln volatilization is a mature process to treat zinc leaching residue.An experimental study on reduction and volatilization of zinc,lead and indium was carried out for certain hydrometallurgical zinc leaching residue.The results show that phase in zinc leaching slag is mainly zinc ferrite.Volatilization rate of zinc,lead and indium is 99.92%,99.59%and 83.46%,respectively,and content of zinc,lead and indium in slag is 0.025%,0.027%and 0.013%,respectively,under the conditions including coal ratio of 30%,volatilization temperature of 1150℃,and volatilization time of 1 h.Kiln slag can be magnetically separated to recover iron,and then recover carbon,copper and silver by flotation.Tailings can be used as raw materials for building materials such as cement and bricks.