Mg~(2+)-CO_3~(2-)-Nta~(3-)-H_2O体系热力学平衡分析
|
摘要
以氨三乙酸盐为配体浸出次生氧化矿杂质镁的常见形态碳酸镁,建立了Mg~(2+)-CO_3~(2-)-Nta~(3-)-H_2O体系的配合平衡热力学,并在氨三乙酸根(Nta~(3-))总浓度0~2.5mol/L和pH 5~14范围内绘制了其热力学平衡图,考察了Nta~(3-)配体对镁的选择性。结果表明,碳酸镁在酸性条件下的浸出主要是H+的作用,在碱性条件下的浸出主要是Nta~(3-)和Mg~(2+)的配合作用,但是其配合能力较弱,导致其在碱性条件下溶出量有限。因此,碱性氨三乙酸盐体系对矿物中镁具有较高的选择性。
Impurity of magnesium carbonate(MgCO_3)was studied with nitrilotriacetic acid as ligand.Thermodynamic equilibrium equation of Mg~(2+)-CO_3~(2-)-Nta~(3-)-H2 O system was established, and thermodynamic equilibrium diagram was drawn to investigate selectivity of Nta~(3-)on magnesium under total concentration of Nta~(3-)of 0~2.5 mol/L and pH value of 5~14.The results show that dissolution of MgCO_3 under acidic condition is mainly upon effect of H+,while dissolution of MgCO_3 under alkaline condition is mainly due to coordination reaction between Mg~(2+)and Nta~(3-).However,dissolution quantity of MgCO_3 is very low in alkaline system because coordination ability of Mg~(2+)with Nta~(3-)is very weak.Alkaline nitrilotriacetic acid system has high selectivity to magnesium in minerals.
Impurity of magnesium carbonate(MgCO_3)was studied with nitrilotriacetic acid as ligand.Thermodynamic equilibrium equation of Mg~(2+)-CO_3~(2-)-Nta~(3-)-H2 O system was established, and thermodynamic equilibrium diagram was drawn to investigate selectivity of Nta~(3-)on magnesium under total concentration of Nta~(3-)of 0~2.5 mol/L and pH value of 5~14.The results show that dissolution of MgCO_3 under acidic condition is mainly upon effect of H+,while dissolution of MgCO_3 under alkaline condition is mainly due to coordination reaction between Mg~(2+)and Nta~(3-).However,dissolution quantity of MgCO_3 is very low in alkaline system because coordination ability of Mg~(2+)with Nta~(3-)is very weak.Alkaline nitrilotriacetic acid system has high selectivity to magnesium in minerals.
引文
[1]周京英,孙延绵,付水兴.中国主要有色金属矿产的供需形势[J].地质通报,2009,28(2/3):171-176.
[2]左铁镛,戴铁军.有色金属材料可持续发展与循环经济[J].中国有色金属学报,2008,18(5):755-763.
[3]赵金艳,王金生,郑骥.有色金属冶炼废渣有价金属湿法回收技术及现状[J].矿产综合利用,2012(4):7-11.
[4]ZHANG Y D,HUA Y X,GAO X B,et al.Recovery of zinc from a low-grade zinc oxide ore with high silicon by sulfuric acid curing and water leaching[J].Hydrometallurgy,2016,166:16-21.
[5]刘三军,欧乐明,冯其明,等.低品位氧化锌矿石的碱法浸出[J].湿法冶金,2005,24(93):23-25.
[6]郭学益,刘静欣,田庆华,等.有色金属复杂资源低温碱性熔炼原理与方法[J].有色金属科学与工程[J].2013,4(2):8-13.
[7]刘建华,张焕然,王瑞祥,等.氨法加压浸出钴铜氧化矿工艺[J].稀有金属,2012,36(1):149-153.
[8]吴爱详,胡凯明,王贻明,等.含碳酸盐脉石氧化铜矿的酸浸动力学[J].工程科学报,2016,38(6):760-766.
[9]刘志雄.氨性溶液中含铜矿物浸出动力学及氧化铜-锌矿浸出工艺研究[D].长沙:中南大学,2012.
[10]窦爱春,刘云建,苏明如,等.Ca2+-CO2-3-Gly--H2O体系热力学分析[J].矿产保护与利用,2017(3):58-64.
[11]杨天足,刘珍珍,任晋,等.Cu(Ⅱ)-Glu2--CO2-3-H2O体系热力学平衡分析[J].过程工程学报,2009,9(4):745-749.
[12]杨天足,任晋,刘伟锋,等.Zn(Ⅱ)-Glu2--CO2-3-H2O体系热力学平衡分析[J].中国有色金属学报,2009,19(6):1155-1161.
[13]窦爱春.碱性亚氨基二乙酸盐体系处理低品位氧化锌矿的基础理论及工艺研究[D].长沙:中南大学,2012.
[14]任晋.碱性谷氨酸钠体系处理低品位氧化锌矿的基础理论和工艺[D].长沙:中南大学,2010.
[15]窦爱春,刘坷,杨天足,等.Ca2+-CO2-3-Ida2--H2O体系热力学分析[J].湿法冶金,2017,36(6):515-520.
[16]MARTELL A E,SMITH R M.Critical stability constants(volume 4:Inorganic Ligands)[M].New York and London:Plenum Press,1974:37.
[17]MARTELL A E,SMITH R M.Critical stability constants(volume 1:Amino Acids)[M].New York and London:Plenum Press,1974:139.
[2]左铁镛,戴铁军.有色金属材料可持续发展与循环经济[J].中国有色金属学报,2008,18(5):755-763.
[3]赵金艳,王金生,郑骥.有色金属冶炼废渣有价金属湿法回收技术及现状[J].矿产综合利用,2012(4):7-11.
[4]ZHANG Y D,HUA Y X,GAO X B,et al.Recovery of zinc from a low-grade zinc oxide ore with high silicon by sulfuric acid curing and water leaching[J].Hydrometallurgy,2016,166:16-21.
[5]刘三军,欧乐明,冯其明,等.低品位氧化锌矿石的碱法浸出[J].湿法冶金,2005,24(93):23-25.
[6]郭学益,刘静欣,田庆华,等.有色金属复杂资源低温碱性熔炼原理与方法[J].有色金属科学与工程[J].2013,4(2):8-13.
[7]刘建华,张焕然,王瑞祥,等.氨法加压浸出钴铜氧化矿工艺[J].稀有金属,2012,36(1):149-153.
[8]吴爱详,胡凯明,王贻明,等.含碳酸盐脉石氧化铜矿的酸浸动力学[J].工程科学报,2016,38(6):760-766.
[9]刘志雄.氨性溶液中含铜矿物浸出动力学及氧化铜-锌矿浸出工艺研究[D].长沙:中南大学,2012.
[10]窦爱春,刘云建,苏明如,等.Ca2+-CO2-3-Gly--H2O体系热力学分析[J].矿产保护与利用,2017(3):58-64.
[11]杨天足,刘珍珍,任晋,等.Cu(Ⅱ)-Glu2--CO2-3-H2O体系热力学平衡分析[J].过程工程学报,2009,9(4):745-749.
[12]杨天足,任晋,刘伟锋,等.Zn(Ⅱ)-Glu2--CO2-3-H2O体系热力学平衡分析[J].中国有色金属学报,2009,19(6):1155-1161.
[13]窦爱春.碱性亚氨基二乙酸盐体系处理低品位氧化锌矿的基础理论及工艺研究[D].长沙:中南大学,2012.
[14]任晋.碱性谷氨酸钠体系处理低品位氧化锌矿的基础理论和工艺[D].长沙:中南大学,2010.
[15]窦爱春,刘坷,杨天足,等.Ca2+-CO2-3-Ida2--H2O体系热力学分析[J].湿法冶金,2017,36(6):515-520.
[16]MARTELL A E,SMITH R M.Critical stability constants(volume 4:Inorganic Ligands)[M].New York and London:Plenum Press,1974:37.
[17]MARTELL A E,SMITH R M.Critical stability constants(volume 1:Amino Acids)[M].New York and London:Plenum Press,1974:139.