Synthesis of novel thionocarbamate for copper-sulfur flotation separation and its adsorption mechanism  

新型铜硫浮选分离硫氨酯捕收剂的合成及吸附机理

作　　者：Fei CAO De-si SUN Xian-hui QIU De-zhi ZHOU Xing-rong ZHANG Chuan-yao SUN 曹飞;孙德四;邱仙辉;周德志;张行荣;孙传尧(九江学院化学化工学院,九江332005;矿冶科技集团有限公司矿物加工科学与技术国家重点实验室,北京102600;江西理工大学资源与环境工程学院,赣州341000;紫金矿业集团有限公司低品位难选金矿综合利用国家重点实验室,上杭364200)

机构地区：[1]School of Chemistry and Chemical Engineering,Jiujiang University,Jiujiang 332005,China [2]State Key Laboratory of Mineral Processing,BGRIMM Technology Group,Beijing 102600,China [3]School of Resource and Environment Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China [4]State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores(Zijin Mining Group Co.,Ltd.),Shanghang 364200,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第8期2709-2718,共10页中国有色金属学报（英文版）

基　　金：financial supports from the Open Foundation of State Key Laboratory of Mineral Processing,China (Nos.BGRIMM-KJSKL-2019-06,BGRIMMKJSKL-2022-13);the Open Fund of State Key Laboratory of Comprehensive Utilization of Low-Grade,China (No.ZJKY2017(B)KFJJ003)。

摘　　要：As a novel collector, O-isopropyl-N,N-diethyl thionocarbamate(IPDTC) was designed and synthesized for copper-sulfur flotation separation. Density functional theory calculations were performed to investigate the electronic structures of IPDTC. The results showed that IPDTC had higher energy of the highest occupied molecular orbital but lower electronegativity than O-isopropyl-N-ethyl thionocarbamate(Z-200). It was predicted that IPDTC had strong collection ability according to the reaction energy criteria. Flotation results demonstrated that the collecting ability of IPDTC to chalcopyrite and pyrite was stronger than that of Z-200. Then, the flotation mechanism was analyzed by measurements of surface tension, adsorption capacity, XPS, FTIR and zeta potential. These results indicated that IPDTC could reduce the solution surface tension. The adsorption capacity of IPDTC on chalcopyrite was higher than that on pyrite, consistent with the results of the flotation tests. FTIR, zeta potential and XPS results also demonstrated that IPDTC was strongly absorbed on the chalcopyrite surface by formation of Cu—S—C bonds, but showed a weak affinity on the pyrite surface.设计合成一种新型铜硫浮选分离捕收剂:O-异丙基-N,N-二乙基硫代氨基甲酸酯(IPDTC)。先利用密度泛函理论计算IPDTC的电子结构。结果表明,IPDTC比O-异丙基-N-乙基硫代氨基甲酸酯(Z-200)具有更高的最高占据分子轨道能量和更低的电负性。根据相互作用能判据预测IPDTC具有较强的捕收能力。浮选试验表明,IPDTC对黄铜矿和黄铁矿的捕收能力强于Z-200。通过表面张力、吸附量、XPS、FTIR和zeta电位等方法研究捕收剂的浮选机理。研究发现,IPDTC可降低溶液表面张力。IPDTC在黄铜矿表面的吸附能力强于黄铁矿,这与浮选试验结果相吻合。FTIR、zeta电位和XPS结果表明,IPDTC通过形成Cu—S—C键在黄铜矿表面发生较强的吸附作用,但在黄铁矿表面的吸附作用较弱。

关 键 词：O-isopropyl-N N-diethyl thionocarbamate adsorption mechanism CHALCOPYRITE PYRITE density functional theory 

分 类 号：TD923.1[矿业工程—选矿] TD952