氰化尾渣高温氯化焙烧制备陶粒

以氰化尾渣为主要原料,配以膨润土、钠长石、CaCl2、煤粉等辅料,利用高温氯化焙烧方法制备了陶粒。采用XRD、SEM、XRF、TG/DTA、ICP-OES等研究了氰化尾渣的物相成分、微观结构等理化性能,测定了陶粒成品的吸水率、堆积密度、重金属挥发率等,并对烧成效果最好的陶粒成品进行了微观结构分析。结果表明,氰化尾渣利用率最高能达到75%,得到的焙烧陶粒1h吸水率为9.45%、堆积密度为642.93kg/m3,Au、Ag、Cu、Pb、Zn等金属挥发率分别达到83.02%、65.31%、75.89%、90.65%、85.34%。

Preparation of Ceramsite from Cyanide Tailings by Chlorination Roasting Process

Ceramsites were prepared through high-temperature chlorination roasting applying cyanidation tailings as raw materials and bentonite, sodium feldspar, CaCl2 and coal powder as additives. Physical and chemical properties of cyanide tailings such as phase composition and microstructure were analyzed with XRD, SEM, XRF, TG/DTA, ICP-OES and so on. Water absorption, bulk density, and heavy metal volatility of resultant ceramsite samples were measured. Ceramsites with the best performance parameters in original samples were selected for morphology analysis. The results indicate that cyanide tailings show a maximum utilization rate up to 75%, water absorption rate of ceramsite of one hour is 9.45%, and bulk density of ceramsite is 642.93 kg/m3. Volatility rates of heavy metals of Au, Ag, Cu, Pb and Zn is 83.02%, 65.31%, 75.89%, 90.65%, and 85.34%, respectively.