有機抑制劑SDD與BX在銅活化閃鋅礦表面的競爭吸附機制

羅德強; 劉建; 王瑜; 曾勇

doi:10.13374/j.issn2095-9389.2018.05.003

有機抑制劑SDD與BX在銅活化閃鋅礦表面的競爭吸附機制

doi: 10.13374/j.issn2095-9389.2018.05.003

羅德強¹,
劉建^1,2, ,,
王瑜¹,
曾勇²

1) 昆明理工大學國土資源工程學院, 昆明 650093
2) 昆明理工大學省部共建復雜有色金屬資源清潔利用國家重點實驗室, 昆明 650093

基金項目:

云南省青年人才培養基金資助項目(KKSY201421110)

云銅校企預研基金資助項目(KKZ4201521003)

國家自然科學基金資助項目(51764037,51704135)

詳細信息

中圖分類號: TD952
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出版歷程
- 收稿日期: 2017-09-19

Competitive adsorption mechanism of organic depressant SDD with BX on copper-activated sphalerite

LUO De-qiang¹,
LIU Jian^{1,2
, ,},
WANG Yu¹,
ZENG Yong²

1) Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
2) State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China

摘要

摘要: 通過單礦物浮選試驗揭示了有機抑制劑SDD對銅活化閃鋅礦的抑制情況. 在此基礎上,采用Zeta電位測試、Versa STAT電化學工作站的局部交流阻抗(LEIS)測試、前線軌道理論計算對SDD和BX(丁基黃藥)在銅活化閃鋅礦表面的競爭吸附機理進行了研究. 浮選試驗結果表明:SDD是一種銅鋅分離的高效抑制劑,能夠有效的抑制閃鋅礦,而黃銅礦幾乎不受影響;此外,還發現SDD具有用量少且十分敏感的特性,在pH為10,SDD為4.0×10^-5 mol·L^-1的最佳條件下,能夠將銅活化閃鋅礦的回收率降低至16.59%,而黃銅礦的回收率為81.64%. Zeta電位和局部交流阻抗(LEIS)分析表明:SDD不但能夠占據銅活化閃鋅礦表面的活化位點,而且其吸附能力強于BX,這極大的降低了BX在銅活化閃鋅礦表面的吸附量,從而對銅活化閃鋅礦表現出良好的抑制作用. 前線軌道理論計算進一步證實SDD與銅活化閃鋅礦作用能力強于BX.
- 銅活化閃鋅礦 /
- 二甲基二硫代氨基甲酸鈉 /
- 競爭吸附 /
- 局部交流阻抗 /
- 前線軌道理論
Abstract: The separation of Cu-Zn polymetallic sulfide by flotation has been a difficult and well-researched topic in the field of mineral processing. One of the important reasons why it is difficult to separate Cu and Zn is the presence of a large amount of copper ions in the pulp, which results in the unavoidable activation of sphalerite. The key to solving this difficulty is the development of a high-selectivity depressor for sphalerite. Sodium dimethyl dithiocarbamate (SDD, C₃H₆NS₂Na) is the lowest homologue of dialkyldithiocarbamate salts, and it has the shortest hydrophobic group (-CH₃) in its molecular structure with weak hydrophobicity. In preliminary exploration experiments, it was found that SDD has good selectivity for Cu-Zn sulfide flotation and can achieve better separation performance than conventional depressors. However, the depression mechanism is not very clear. In this work, the depression effect of SDD on copper-activated sphalerite was revealed by conducting a monomineral flotation test. Based on the results of this test, the competitive adsorption mechanism of SDD and BX on the surface of copper-activated sphalerite was further studied by conducting the Zeta potential test, LEIS (local AC impedance) test of Versa STAT electrochemical workstation, and frontal orbital theory calculation. The flotation results show that the SDD can effectively act as a depressant in copper-zinc separation. Sphalerite is depressed effectively in the presence of SDD, while chalcopyrite is not depressed. In addition, SDD has the characteristics of small dosage and high sensitivity. Under the optimum conditions with pH of 10 and SDD dosage of 4.0×10^-5 mol·L^-1, the recovery of copper-activated sphalerite can be reduced to 16.59%, while the recovery of chalcopyrite is 81.64%. Analysis of the results of the Zeta potential test and LEIS show that SDD can not only occupy the activation site of copper-activated sphalerite surface but also afford better adsorption capacity than BX, which greatly reduces the adsorption of BX on the surface of sphalerite. As a result, SDD shows a good depression effect for copper-activated sphalerite. The frontier orbital calculations further confirm that SDD is superior to BX in its ability to interact with minerals.
- copper-activated sphalerite /
- sodium dimethyl dithiocarbamate /
- competitive adsorption /
- local AC impedance /
- frontal orbital theory

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參考文獻(12)

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