摘要
为探究某高碳酸盐砂岩型铀矿的浸出工艺参数,在室内进行了不同碱性试剂、不同氧化剂条件下的静态浸出试验,运用PHREEQCI软件计算了碳酸盐矿物的饱和指数及浸出液中铀的存在形式,并进行了浸出动力学分析。结果表明,铀浸出率与溶浸液中HCO_(3)^(-)浓度呈正相关,并且NH_(4)HCO_(3)的浸出效果要优于NaHCO_(3);H_(2)O_(2)氧化效果明显强于KMnO_(4)和K_(3)Fe(CN)_(6),铀浸出率随H_(2)O_(2)质量浓度的增加而增长,综合考虑效益、成本等因素,最佳浸出条件为800 mg/L NH_(4)HCO_(3)+2 g/L H_(2)O_(2),最终铀浸出率为21.04%;整个浸出过程方解石和白云石均处于超饱和状态,应控制体系pH以避免碳酸盐发生饱和沉淀;浸出过程中铀的溶解反应主要受表面化学反应控制,扩散影响相对较小。
In order to investigate the leaching process parameters of a high carbonate sandstone type uranium ore,tatic leaching tests were carried out indoors with different alkaline reagents and different oxidants,the saturation index of carbonate minerals and the form of uranium present in leachate were calculated using PHREEQCI software,and leaching kinetic analysis was performed.The results show that leaching rate of uranium is positively correlated with the concentration of HCO_(3)^(-) in leachate,and the leaching effect of NH_(4) HCO_(3) is better than that of NaHCO_(3).The oxidation effect of H_(2)O_(2) is significantly stronger than that of KMnO_(4) and K_(3) Fe(CN)_(6),and the leaching rate of uranium rises with increase of mass concentration of H_(2)O_(2),and the best leaching conditions is 800 mg/L NH_(4) HCO_(3)+2 g/L H_(2)O_(2),with a final uranium leaching rate of 21.04%.The pH value of the system should be controlled to avoid saturation precipitation of carbonate;the dissolution reaction of uranium during the leaching process is mainly controlled by surface chemistry,and the influence of diffusion is relatively small.
作者
马成翠
魏学斌
陈功新
岑丽
孔德悬
陈诗峰
MA Cheng-cui;WEI Xue-bin;CHEN Gong-xin;CEN Li;KONG De-xuan;CHEN Shi-feng(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;Qinghai Oilfield Research Institute of Exploration and Development,Dunhuang 736200,Gansu,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2022年第12期67-76,共10页
Nonferrous Metals（Extractive Metallurgy)
基金
江西省自然科学基金资助项目(20202BABL203033)
国家自然科学基金资助项目(U1967209)
放射性地质与勘探技术国防重点学科实验室基金项目(2020RGET08)
横向科研基金项目(H202100029)。
