氯化焙烧法处理氰化尾渣

Treatment of Cyanide Tailings by Chlorination Roasting

氯化焙烧法常用于处理有色金属含量较低的矿石,可使氰化尾渣中的有色金属挥发出来,通过烟气捕集的方式加以回收。本试验以辽宁省某冶炼厂的焙烧矿氰化尾渣为原料,考察了氯化剂添加量、球团尺寸、焙烧温度以及焙烧时间对有色金属挥发率的影响,并对焙烧终渣的环保指标进行研究。试验结果表明,从氯化焙烧的最佳工艺条件来看,CaCl_(2)添加量为氰化尾渣质量的7%,造球粒度为8~12 mm,焙烧温度为1 100℃,焙烧时间为60 min。在此条件下,Au、Ag、Cu、Pb、Zn的挥发率分别可以达到97.50%、71.45%、57.69%、99.72%、90.87%,残渣的物相组成基本未发生改变。

Chlorination roasting is often used to treat ores with low content of non-ferrous metals,which can volatilize nonferrous metals from cyanide tailings and recover them by means of flue gas capture.Using the cyanide tailings of roasted ore from a smelter in Liaoning Province as raw materials,this experiment investigates the effects of the addition amount of chlorinating agent,pellet size,roasting temperature and roasting time on the volatilization rate of non-ferrous metals,and studies the environmental protection indicators of the roasted tailings.The experiment results show that according to the optimum process conditions of chlorination roasting,the addition amount of Ca Cl_(2)is 7% of the mass of cyanide tailings,the pelletizing particle size is 8~12 mm,the roasting temperature is 1 100℃,and the roasting time is 60 min.Under this condition,the volatilization rate of Au,Ag,Cu,Pb and Zn can reach 97.50%,71.45%,57.69%,99.72% and 90.87% respectively,and the phase composition of the residue has not changed basically.