摘要
针对处理某矿山酸性废水后得到的有价元素种类多、含量低的难处理中和渣进行XRF、XRD、激光粒度检测、SEM-EDS等技术分析,并对中和渣进行了硫酸浸出性研究,对浸出渣进行了浸出毒性探究。分析结果表明,中和渣所含主要元素为Ca(40.67%)、Fe(5.79%)、Cu(2.43%)、Zn(0.13%)、Ni(0.056%)、As(0.009%);渣中主要为金属氧化物、氢氧化物、硫酸盐、硅酸盐和砷酸盐等物质混合物,主要物相为CaSO_(4)、Ca_(6)Fe_(2)(SO_(4))_(2)、CaO、CuAlO_(2)、Fe_(2)O_(3)、Fe(OH)_(3)、FeAsO_(4)、CuO、Cu(OH)_(2)、ZnO;中和渣粒径5.00~75.00μm。浸出试验表明,在硫酸体积浓度10%、液固比6∶1、浸出温度25℃、浸出时间180min的条件下,Cu、Fe、As、Zn、Ni浸出率分别达到99.42%、96.71%、88.89%、99.23%、98.21%。浸出毒性试验结果表明,浸出渣Ni、Cu、As含量达标,可无毒排放。
XRF,XRD,Laser particle size detection,SEM-EDS and other techniques were used to analyze neutralization slag with many kinds of valuable elements and low content obtained from treatment of acid wastewater in copper mine.Sulfuric acid leaching property of neutralization slag was also studied.Leaching toxicity of leaching residue of neutralization slag was investigated.The analysis results show that main elements in neutralization slag are Ca(40.67%),Fe(5.79%),Cu(2.43%),Zn(0.13%),As(0.009%),Ni(0.056%),and is a mixture of metal oxides,hydroxides,sulfates,silicates and arsenates.Main phases are CaSO_(4),Ca_(6)Fe_(2)SO_(4)_(2),CaO,CuAlO_(2),Fe_(2)O_(3),FeOH3,FeAsO_(4),CuO,CuOH2,and ZnO.Particle size of neutralization slag is 5.00-75.00μm.The leaching experiment shows that leaching rate of Cu,Fe,As,Zn,Ni is 99.42%,96.71%,88.89%,99.23%and 98.21%,respectively,under the conditions including volume concentration of sulfuric acid of 10%,L/S of 6∶1,leaching temperature of25℃,and leaching time of 180min.The results of leaching toxicity test show that content of Ni,Cu and As in leaching residue of neutralization slag meets the standard and could be discharged without toxicity.
作者
胡深
张勤
刘子龙
杨洪英
佟琳琳
HU Shen;ZHANG Qin;LIU Zi-long;YANG Hong-ying;TONG Lin-lin(Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education),Northeastern University,Shenyang 110819,China;School of Metallurgy,Northeastern University,Shenyang 110819,China;China National Gold Group Co.,Ltd.,Beijing 100011,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2021年第7期110-115,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
国家重点研发计划项目(2018YFC1902002)
国家自然科学基金资助项目(U1608254)。
关键词
铜矿山酸性废水
中和渣
物性
浸出特性
无毒排放
copper mine acid wastewater
neutralization slag
physical properties
leaching characteristics
non-toxic emissions
