摘要
新疆蒙其古尔铀矿床CO2+O2地浸采铀过程中,铀浓度与HCO3^-浓度呈显著的正相关关系,但经过浸出初期后,提高CO2加入量不能有效提升体系HCO3^-浓度,而对多数地浸单元的矿化条件而言,HCO3^-浓度也尚未达最佳浸出需求。为此在该矿床某采区,采用补加碳酸氢铵和提高CO2加入量相配合的工艺,开展了强化浸出试验。结果表明,强化浸出效果显著,该采区浸出液中HCO3^-从850mg/L提升至1 200mg/L,单孔铀浓度提升1.73~44.33mg/L,集合样铀浓度提升8mg/L。将pH调控在6.2~6.3和降低O2加入量稳定SO4^2-浓度,能避免强化浸出过程中发生碳酸钙和硫酸钙的沉淀,抽、注流量也并未受到影响。该强化浸出技术在多采区应用取得了良好的浸出效果和经济效益,是对该矿床CO2+O2浸出工艺的进一步优化。
Uranium concentration has a significant positive correlation with HCO3^- during CO2+O2 in-situ leaching of uranium process from Mengqiguer sandstone type uranium deposit in Xinjiang.However,after the initial stage of leaching,HCO3^- concentration of leaching solution can be not increased effectively by adding more CO2.For most leaching units of Mengqiguer deposit,HCO3^- concentration does not yet meet the optimal leaching requirement.So,in a selected mining area of the deposit,a trial of supplementing bicarbonate ammonia combined with increasing of CO2 amount was carried out to enhance leaching intensity.The study results show that effect of enhanced leaching is significant:HCO3^- concentration rises from 850 mg/L to 1 200 mg/L,which results in that uranium concentration of pregnant solution of singlewell rises by 1.733-44.33 mg/L,and that of mix pregnant solution by 8 mg/L.While pH value of leaching solution is controlled at 6.2-6.3 and SO4^2- concentration stabilized by reducing O2,precipitation of calcium carbonate and calcium sulfate will not happen during enhanced leaching process.In addition,pumping and injection capacities are not affected passively.This enhanced leaching technology is a further optimization of CO2+O2 leaching process in Mengqiguer deposit,and good leaching effect and economic benefits result from its applications in mining areas.
作者
张青林
周义朋
穆志军
阳晓宇
黎广荣
ZHANG Qing-lin;ZHOU Yi-peng;MU Zhi-jun;YANG Xiao-yu;LI Guang-rong(Xinjiang Tianshan Uranium Co.,Ltd.,CNNC,Yining 835000,Xinjiang,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2020年第12期48-53,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
国家自然科学基金资助项目(41572231)。
关键词
砂岩型铀矿
CO2+O2地浸
HCO-3强化浸出
sandstone type uranium deposit
CO2+O2 in-situ leaching
intensive leaching by HCO-3
