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酸法原位地浸采铀作为回收铀资源首选工艺，不可避免会存在部分铀进入地下水污染生态环境，而采用还原剂Na_2S_2O4将游离的铀还原固定可高效解决此类问题。为此，针对某酸法地浸采铀退役铀矿山地下水铀污染，采用PHREEQC模拟分析Na_2S_2O4还原固定地下水中可溶性铀的机制，讨论NaHCO3在Na_2S_2O4还原固定可溶性铀的影响。模拟结果表明：1)该区域地下水中铀以U(Ⅵ)为主，其中UO_2SO4、UO2~2+和UO2(SO4)22-为优势物种，分别占63.60%、32.35%和3.89%;2)Na_2S_2O4还原固定可溶性铀时，会降低地下水Eh值和Fe(Ⅲ)浓度，增强地下水还原性，促进沥青铀矿和黄铁矿沉淀，但会造成地下水酸化和高SO32-浓度；3)NaHCO_3+Na_2S_2O4在还原固定可溶性铀时，减轻了地下水酸化，增强了对U(Ⅵ)和SO32-的去除，对Na_2S_2O4还原固定可溶性铀的影响较小，在Na_2S_2O4和NaHCO3浓度比为1∶1至1∶1.5时修复效果最佳。
Abstract：Acid in-situ leaching of uranium is the preferred process for recovering uranium resources, some uranium will inevitably flow into groundwater and pollute the ecological environment.However, the reduction and fixation of free uranium with the reductant Na_2S_2O4 can effectively solve this problem.Therefore, the mechanism of Na_2S_2O4 reduction and fixation of soluble uranium in the groundwater of a decommissioned uranium mine in the acid leaching method was simulated and analyzed using PHREEQC,and the influence of NaHCO3 on Na_2S_2O4 reduction of fixed soluble uranium was discussed.The simulation results show that: 1)U(Ⅵ)is the dominant uranium in the groundwater of this area, in which UO_2SO4,UO2~2+ and UO2(SO4)22- are the dominant species, accounting for 63.60%,32.35% and 3.89% respectively.2)The reduction of fixed soluble uranium by Na_2S_2O4 can reduce the Eh value and Fe(Ⅲ)concentration of groundwater, enhance the reducibility of groundwater, and promote the precipitation of uraninite and pyrite, but cause acidification and high SO32- concentration of groundwater.3)When reducing fixed soluble uranium, NaHCO_3+ Na_2S_2O4 alleviates groundwater acidification, enhances the removal of U(Ⅵ)and SO32-,and has little effect on the reduction of fixed soluble uranium by Na_2S_2O4.The optimum remediation effect is achieved when the concentration ratio of Na_2S_2O4 to NaHCO3 is between 1∶1 and 1∶1.5.
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基本信息:
DOI：10.3969/j.issn.1007-7545.2024.04.011
中图分类号:X753;X523
引用信息:
[1]王晓玭.基于PHREEQC模拟分析Na_2S_2O_4对退役铀矿山采区地下水生态的修复[J].有色金属(冶炼部分),2024(04):94-101.DOI:10.3969/j.issn.1007-7545.2024.04.011.
基金信息:
江西省教育厅科学技术研究项目(191558); 江西省高等学校教学改革研究课题(JXJG-21-30-5)
2023-11-20
2023
2023-11-25
2023-12-11
2023
1
2024-03-20
2024-03-20