摘要
采用Tessier连续提取法确定矿样中Pb的存在形态和组成。通过土柱实验对稀土矿的开采过程进行模拟,研究稀土矿开采过程中NH_4^+活化重金属Pb的过程。结果表明:Fe-Mn氧化物结合态和可交换态是矿样中Pb最主要的存在形态,约占Pb总量68.75%和23.13%。土柱实验中可交换态的Pb减少0.7358 mg,占浸矿前含量的84.98%。浸出液中的Pb占浸矿前可交换态Pb的5.67%。土柱中碳酸盐结合态Pb和Fe-Mn氧化物结合态Pb含量增加,分别增加0.3224和0.091 mg,占未浸矿前可交换态Pb的37.24%和10.5%。因此,离子型稀土矿开采过程中优先活化可交换态Pb,被活化的可交换态Pb一部分随稀土母液流出矿体,另一部分在形态上转化为其他态。
To study the activation mechanism of Pb,the existence form and proportion of Pb in ore samples were obtained by Tessier,and the ionic rare earth ore process was through the soil column experiment simulated. The results showed that the Fe-Mn oxides and exchangeable fraction Pb were the main form,accounting for 68. 75% and23. 13%. The exchangeable Pb decreased 0. 7358 mg. The leaching Pb accounted for only the exchangeable5. 67%. The quantity of carbonate and Fe-Mn oxides are increased,which accounted initial exchangeable Pb for37. 24% and 10. 5%. Therefore,exchangeable Pb should be activated firstly. A part of activated exchangeable Pb got out of the ore with mother liquor. The form of the rest of the activated exchangeable Pb can transform into another form.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2016年第2期252-256,共5页
Journal of the Chinese Society of Rare Earths
基金
国家科技支撑计划项目(2011BAC12B00)
北京市教委科研基地(004000546612008)资助
关键词
离子型稀土矿
土壤
铅活化
地下水污染
ionic rare earth ore
soils
Pb activation
groundwater pollution
