Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第16卷    第6期    总第87期    2006年6月

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文章编号:1004-0609(2006)06-1108-07
乙氧羰基硫代氨基甲酸酯弱碱性条件下优先选铜
刘广义1, 钟宏1, 戴塔根2

(1. 中南大学 化学化工学院, 长沙 410083;
2. 中南大学 地学与环境工程学院, 长沙 410083
)

摘 要:  丁黄药、 Z-200和乙氧羰基硫代氨基甲酸酯(ECTC)浮选永平铜矿小型实验和工业实验结果表明, 为有效实现铜硫浮选分离, 丁黄药要求矿浆pH值不低于12.5, Z-200要求矿浆pH值不低于10.5, 而ECTC只要求矿浆pH值为8.5。采用普遍化微扰理论和密度泛函B3PW91/6-31G(D)计算从捕收剂结构与性能的关系对上述实验结果进行了分析。 ECTC最高占据分子轨道(HOMO)主要由硫代羰基中硫原子的px和py轨道组成, 其能量为-0.217 29(a.u.), 给电子能力较弱; 最低未占据分子轨道(LUMO)由官能团—O—C(==O)—N—C(==S)—O—中各原子的pz轨道组成, 为共轭π键, 接受电子的能力强。 ECTC易与表面电子组态为(t2g)6(eg)3Cu(Ⅱ)或t6e4 Cu(Ⅰ)的硫化铜矿物形成正配键和反馈键, 而难与表面电子组态为(ta2g)3(eag)2Fe(Ⅲ)或(t2g)6Fe(Ⅱ)(碱性条件或弱碱性条件下以Fe(Ⅲ)为主要成分)的硫化铁矿物作用, 能在pH 8.5的弱碱性介质中实现优先选铜。 UV和FTIR光谱结果进一步证实ECTC捕收剂对铜矿物具有优异的捕收能力, 对硫矿物具有好的选择性。

 

关键字:  乙氧羰基硫代氨基甲酸酯; 硫化铜矿; 弱碱性; 密度泛函; 选择性; 浮选

Separation of chalcopyrite from pyrite at
slightly alkaline conditions using ethoxylcarbonyl thionocarbamate as collector
LIU Guang-yi, ZHONG Hong, DAI Ta-gen

1. School of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, China;
2. School of Geoscience and Environmental Engineering,
Central South University, Changsha 410083, China

Abstract: The bench-scale and industrial flotation test results of Jiangxi Copper Corporation Yongping Copper Mine show that the flotation separation of chalcopyrite from pyrite is only achieved above pH 12.5 for butyl xanthate, above pH 10.5 for Z-200 and around pH 8.5 for ethoxylcarbonyl thionocarbamate (ECTC) respectively. The flotation results were analyzed from the structureactivity relationship of collectors by generalized perturbation theory and density functional calculation at B3PW91/6-31G(D) level. ECTC's highest occupied molecular orbit (HOMO) is composed of px and py orbits of thiocarbonyl sulfur atom and its orbital eigenvalue is -0.217 29 a.u.. ECT can slightly donate its HOMO electrons. And the lowest unoccupied molecular orbit (LUMO) of ECTC, which is constituted by pz orbits of every atoms in the conjugate —O—C(==O)—N—C(==S)—O— group, can easily accept electrons. ECTC collector can be strongly bonded with (t2g)6(eg)3Cu(Ⅱ) or t6e4 Cu(Ⅰ) on the surface of chalcopyrite through normal covalent bond and back donation covalent bond, but the interaction between ECTC and (t2g)6Fe(Ⅱ) or (ta2g)3(eag)2 Fe(Ⅲ) which is the predominant composition at alkaline conditions in the surface of pyrite is very weak. In the presence of ECTC, the selective flotation of copper sulfide minerals from iron sulfide minerals in Yongping Copper Mine was carried out at slightly alkaline conditions. ECTC is a powerful collector for chalcopyrite and very selective against pyrite, which is further confirmed by the results of UV and FTIR spectra.

 

Key words: ethoxylcarbonyl thionocarbamate; copper sulfide minerals; slightly alkaline values; density functional theory; selectivity; flotation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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