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对硬岩铀矿开展柠檬酸溶浸试验。结果表明,0.1mol/L的柠檬酸浸出120h的铀浓度为208mg/L,浸出率达到41.2%,比稀硫酸(pH=2.0)浸出率(3.7%)高37.5个百分点,且酸碱平衡后,柠檬酸与铀矿的络合作用明显;柠檬酸铀酰结合Fe3+的[FeUO_2OHCit]+形态占比达到62.18%,为浸出液中的优势形态,对Fe3+的亲和性有利于铀矿中U(Ⅳ)氧化溶浸;质谱还检测到[UO_2H_2Cit]+、[UO_2H_2CitH_3Cit]+、[UO_2H_2Cit(H_3Cit)2]+、[UO_2H_2CitH_2O]+和[(UO_2H_2Cit)_2H_3Cit]2+等形态;溶浸过程中CaCO3饱和指数始终为负值,溶浸过程中CaCO3处于未饱和状态,不易形成沉淀;柠檬酸溶浸硬岩铀矿可行。
Abstract：Test of citric acid leaching was performed on hard-rock uranium ore.The results show that uranium concentration is 208 mg/L after 120h of leaching with 0.1 mol/L citric acid,and uranium leaching rate is 41.2%,37.5 percent points higher than that with dilute sulfuric acid (pH=2.0)leaching.In addition,after reaching acid-base equilibrium,citric acid and uranium ore show significant complexation.Form of[FeUO_2OHCit]~+from combination of uranyl citrate with Fe3+accounts for 62.18%,being the dominant form in leachate.Affinity to Fe3+is favorable for oxidative leaching of U(Ⅳ)in uranium ore.[UO_2H_2Cit]+,[UO_2H_2CitH_3Cit]+,[UO_2H_2Cit(H_3Cit)2]+,[UO_2H_2CitH_2O]+,[(UO_2H_2Cit)_2H_3Cit]2+and other forms are detected by mass spectrum.During leaching,CaCO3 saturation index (SI)remains negative,indicating its unsaturated state,therefore not easy to precipitate.It is feasible to leach hardrock uranium ore with citric acid.
[1] JONES D L,DENNIS P G,OWEN A G.Organic acid behavior in soils misconceptions and knowledge gaps[J].Plant and Soil,2003,248:31-41.
[2] ZHANG H L,BLOOM P R.Dissolution kinetics of hornblende in organic acid solutions[J].Soil Science Society of America Journal,1999,63(4):815-822.
[3]吴宏海，胡勇有，黎淑平.有机酸与矿物间界面作用研究评述[J].岩石矿物学杂志，2001,20(4):399-404.WU H H,HU Y Y,LI S P.A review on interact ions at the interface between organic acids and minerals[J].Acta Petrologica et Mineralogica,2001,20(4):399-404.
[4] GEFFROY C,FOISSY A,PERSELLO J,et al.Surface complexation of calcite by carboxylates in water[J].Journal of Colloid and Interface Science,1999,211(1):45-53.
[5]乔冬梅，樊向阳，齐学斌，等.不同有机酸对重金属镉形态及生物有效性的影响[J].灌溉排水学报，2012,31(6):15-17,31.QIAO D M,FAN X Y,QI X B,et al.The effect of different organic acids on existing forms and bioavailability of cadmium[J].Journal of Irrigation and Drainage,2012,31(6):15-17,31.
[6]吴俭，潘玮斌，林瑞聪，等.用酒石酸等有机酸清洗镉锌、镉镍复合污染土壤[J].农业环境科学学报，2015,34(6):1076-1081.WU J,PAN W B,LIN R C,et al.Remediation of soils co-contaminated with Cd-Zn and Cd-Ni by washing with oranic acids[J].Journal of Agro-Environment Science,2015,34(6):1076-1081.
[7] HEFNAWY M A,EL-SAID M,HUSSEIN M,et al.Fungal leaching of uranium from its geological ores in Alloga area,west central Sinai,Egypt[J].Journal of Biological Sciences,2002,2(5):346-350.
[8] HARPER R,KANTER C.Encyclopedia of Ecology:Uranium[M].Amsterdam:Elsevier,2008:3662-3665.
[9] THIERRY L,IONUT M,NATACHA H,et al.The crystal chemistry of uranium carboxylates[J].Coordination Chemistry Reviews,2014,266-267:69-109.
[10]MIKHAILOV Y N,KANISHCHEVA A S,GORBUNOVA Y E,et al.Crystal and molecular structure of aquaacetate uranyl complexes with 18-crown-6,[UO2(CH3COO)(OH)(H2O)]2·18-crown-6 and[UO2(CH3COO)2(H2O)]·（H2O）2·18-crown-6[J].Zhurnal Neorganicheskoi Khimii,1997,42(12):1980-1985.
[11]DUVIEUBOURG L,NOWOGROCKI G,ABRAHAM F,et al.Hydrothermal synthesis and crystal structures of new uranyl oxalate hydroxides：α-andβ-[（UO2）2(C2O4)(OH)2(H2O)2]and[(UO2)2(C2O4)(OH)2(H2O)2]·H2O[J].Journal of Solid State Chemistry,2005,178(11):3437-3444.
[12]ROWLAND C E,CAHILL C L.Capturing hydrolysis products in the solid state:effects of pH on uranyl squarates under ambient conditions[J].Inorganic chemistry,2010,49(19):8668-8673.
[13]BORKOWSKI M,LIS S,CHOPPIN G R.Complexation study of NpO2+and UO22+ions with several organic ligands in aqueous solutions of high ionic strength[J].Radiochimica Acta,1996,74:117-121.
[14]FRANCIS A J,DODGE C J,GILLOW J B,et al.Biotransformation of uranium compounds in high ionic strength brine by a halophilic bacterium under denitrifying conditions[J].Environmental Science and Technology,2000,34(11):2311-2317.
[15]曾凯，陈焕文，罗明标，等.电喷雾串联质谱快速鉴别水溶液中铀酰形态及在柠檬酸铀酰形态研究的应用[J].分析化学，2019,47(3):429-438.ZENG K,CHEN H W,LUO M B,et al.Rapid identification of uranyl speciation in solution by Electrospray Ionization Tandem Mass Spectrometry and speciation research of uranyl citrate[J].Chinese Journal of Analytical Chemistry,2019,47(3):429-438.
[16]黄少波.地球化学软件PHREEQC在湿法冶金计算热力学中的应用[J].矿冶工程，2018,38(2):70-73.HUANG S B.Application of geochemical software PHREEQC in computation of thermodynamics in hydrometallurgy[J]. Mining and Metallurgical Engineering,2018,38(2):70-73.
[17]陈经明，李寻，罗跃，等.基于PHREEQC拟合地浸采铀尾液中去除硫酸根离子模拟研究[J].有色金属（冶炼部分），2020(3):45-49.CHEN J M,LI X,LUO Y,et al.Simulation study on removal of sulfate ion in in-situ leaching uranium tail liquid based on PHREEQC[J].Nonferrous Metals(Extractive Metallurgy),2020(3):45-49.
[18]BARD A J,PARSONS R,JORDAN J.Standard Potentials in Aqueous Solution[M].Boca Raton:Routledge,2017.DOI:10.1201/9780203738764.
[19]吉宏斌，周义朋，孙占学，等.蒙其古尔铀矿床CO2+O2地浸浸出过程分析与探讨[J].有色金属（冶炼部分），2018(3):55-59.JI H B,ZHOU Y P,SUN Z X,et al.Analysis and discussion on CO2+O2 in-situ leaching of uranium process at Mengqiguer deposit[J].Nonferrous Metals(Extractive Metallurgy),2018(3):55-59.
基本信息:
中图分类号:TL212.12
引用信息:
[1]徐玲玲,张一诺,周义朋,等.柠檬酸溶浸硬岩铀矿的浸出特征及铀形态研究[J].有色金属(冶炼部分),2021(08):81-86.
基金信息:
国家自然科学基金资助项目（41772266）; 江西省教育厅科技计划项目（GJJ160563）
2021-08-05
2021-08-05