氰化尾渣中低温破氰试验研究  

Experimental Study on Cyanide Removal from Cyanide Tailings at Low Temperature

作　　者：程伟凤 翟菊彬 兰馨辉 崔崇龙 李家玮 CHENG Weifeng;ZHAI Jubin;LAN Xinhui;CUI Chonglong;LI Jiawei(Changchun Gold Research Institute Co.,Ltd.)

机构地区：[1]长春黄金研究院有限公司

出　　处：《现代矿业》2022年第11期144-147,共4页Modern Mining

摘　　要：为了充分降低热解后氰化尾渣作为回填骨料利用产生的环境风险,针对氰化尾渣在中低温条件下的无害化问题,利用回转炉进行了中低温热解研究。研究结果表明:在热解温度350℃、热解时间5.0 h的条件下,总氰化物和易释放氰化物的去除率最高,分别达99.21%和98.39%,易释放氰化物最低,可达0.004 mg/L;考虑到实际操作中运行成本的控制,建议热解时间控制在1.0 h左右,热解温度350℃,亦可获得较好的破氰效果;此外,除在250℃、0.5 h热解条件下,氰渣毒性浸出液中易释放氰化物浓度不达标外,其余热解条件下的氰渣毒浸指标均满足回填骨料污染控制要求。In order to fully reduce the environmental risk caused by the utilization of cyanide tailings as backfill aggregate after pyrolysis,aiming at the harmless problem of cyanide tailings under medium and low temperature conditions,the pyrolysis of cyanide tailings at medium and low temperature was studied by using rotary furnace.The results showed that under the conditions of pyrolysis temperature 350℃,and py⁃rolysis time 5.0 h,the removal rates of total cyanide and easily released cyanide were the highest,reaching 99.21%and 98.39%,respectively,and the easily released cyanide was the lowest,reaching 0.004 mg/L;considering the control of operation cost in actual operation,it is suggested that the pyrolysis time should be controlled at about 1.0 h and the pyrolysis temperature at 350℃,which can also obtain better cyanide breaking effect.In addition,except under the pyrolysis condition of 250℃and 0.5 h,the cyanide concen⁃tration in the toxic leaching solution of cyanide residue is not up to the standard,the toxic leaching indexes of cyanide residue under the other pyrolysis conditions all meet the pollution control requirements of back⁃fill aggregate.

关 键 词：氰化尾渣 热解 中低温 破氰 回填骨料 

分 类 号：X758[环境科学与工程—环境工程]