摘要
广西大厂凤凰选矿厂处理锡石硫化矿。通过柱式静态浸泡试验研究了浸泡液初始pH值、液固比、尾矿堆积高度对该厂尾矿中Mn、Zn、As溶出行为的影响以及不同条件下浸泡液pH的变化情况。结果表明：①不同的初始pH、液固比以及尾矿堆积高度下,随着浸泡时间的延长,Mn和Zn的溶出浓度均先显著下降然后趋于稳定,累积溶出量均先快速增长然后缓慢增长,As则无论是溶出浓度还是累积溶出量均总体上呈近乎线性增长趋势,而浸泡液的pH值均被中和到7．2-8．0之间。②初始pH为3．5时Mn、Zn最易溶出,为5．5时次之,为4．5时相对最难,但初始pH对As的溶出无显著影响；液固比越大,Mn、Zn和As均越容易溶出；尾矿堆积高度总体上对Mn、Zn和As的溶出都无显著影响。③试验范围内,Mn、Zn、As的溶出量都很低,对应的累积溶出量最大值分别只有14．505、13．471、0．768 mg/kg。以上研究成果可为现场尾矿库重金属污染的防控提供参考。
Fenghuang Dressing Plant of Dachang in Guangxi Province is planning to deal with the cassiterite sulfide ore. Effects of soaking solution pH,liquid-solid ratio,stack height on release behavior of Mn,Zn,As in tailings,as well as pH values at various conditions,are investigated through the column static soaking immersion tests. Results indicated that：①when the in-itial pH,liquid-solid ratio,and stack height are different,and as the leaching time extended,release concentration of Mn and Zn is dropped dramatically first and then went steady. The cumulative release was rapidly increased first and then grown slowly. Meanwhile,As leaching concentration as well as cumulative release are nearly linearly increased,and the pH value of the soa-king solution is neutralized from 7. 2 to 8. 0.②Mn and Zn releases are the easiest when the initial pH is 3. 5,a little hard with pH value of 5. 5,and the hardest when pH is 4. 5,but the initial pH value has no influence on As leaching behavior;The high-er of liquid-solid ratio,the more easily Mn,Zn and As is leached;Stack height of tailings has little influence on leaching be-havior of Mn,Zn and As.③Within the test range,the release of Mn is very low,as well as Zn and As,and the corresponding maximum leaching amount is 14. 505,13. 471,0. 768 mg/kg respectively. The research results above provide some references for heavy metal pollution prevention and control in the field of tailings dam.
出处
《金属矿山》
CAS
北大核心
2015年第2期160-165,共6页
Metal Mine
基金
广西科技开发重大专项(编号:桂科重1298002-5)
广西八桂学者科技项目(编号:HX01652013070022)
关键词
锡石硫化矿尾矿
柱式静态浸泡
浸泡液初始pH
液固比
尾矿堆积高度
重金属溶出行为
Cassiterite sulfide ore tailings
Column static soaking
Initial pH of soaking solution
Liquid-solid ratio
Stack height of tailings
Heavy metals leaching behavior
