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单宁酸作为黄铜矿与黄铁矿分离抑制剂的作用及机理

Utilization and Mechanisms of Tannic Acid as a Depressant for Chalcopyrite and Pyrite Separation.

作者信息

Sun Da, Li Maolin, Zhang Ming, Cui Rui, Yang Zhiqiang, Yu Lingfeng, Wang Daowei, Yao Wei

机构信息

School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, People's Republic of China.

Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan 430081, People's Republic of China.

出版信息

ACS Omega. 2023 Aug 11;8(33):30474-30482. doi: 10.1021/acsomega.3c03663. eCollection 2023 Aug 22.

DOI:10.1021/acsomega.3c03663
PMID:37636951
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10448649/
Abstract

Current flotation practices using lime or cyanide as depressants in chalcopyrite and pyrite separation have significant disadvantages, such as substantial reagent consumption, high slurry pH, and environmental hazards. This work aimed to explore the utilization and mechanisms of tannic acid (TA) as an eco-friendly alternative to lime or cyanide in chalcopyrite-pyrite separation. Flotation results showed that TA selectively depressed pyrite yet allowed chalcopyrite to float at neutral or alkaline pH. Adsorption density and zeta potential results indicated that TA adsorbed intensely on pyrite but minorly on chalcopyrite. Besides, potassium ethyl xanthate was still largely adsorbed on chalcopyrite but not on pyrite after TA adsorption. Surface analysis by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy further showed that the oxidation species of FeOOH and Fe (SO), particularly FeOOH were the main active sites for TA chemical adsorption. Owing to the greater and faster oxidation of pyrite, more FeOOH and Fe (SO) were generated on the pyrite surface, and the chemical adsorption of TA was more pronounced on the pyrite surface than on the chalcopyrite surface.

摘要

目前在黄铜矿和黄铁矿分离中使用石灰或氰化物作为抑制剂的浮选工艺存在显著缺点，如试剂消耗量大、矿浆pH值高以及环境危害。本研究旨在探索单宁酸（TA）作为一种环保型替代物在黄铜矿 - 黄铁矿分离中替代石灰或氰化物的应用及作用机制。浮选结果表明，TA能选择性地抑制黄铁矿，而在中性或碱性pH值条件下使黄铜矿上浮。吸附密度和zeta电位结果表明，TA在黄铁矿上强烈吸附，而在黄铜矿上吸附较少。此外，TA吸附后，乙基黄原酸钾仍大量吸附在黄铜矿上，但不吸附在黄铁矿上。傅里叶变换红外光谱和X射线光电子能谱的表面分析进一步表明，FeOOH和Fe(SO)的氧化产物，特别是FeOOH是TA化学吸附的主要活性位点。由于黄铁矿氧化程度更高、速度更快，在黄铁矿表面生成了更多的FeOOH和Fe(SO)，TA在黄铁矿表面的化学吸附比在黄铜矿表面更显著。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ce18/10448649/005bfc855d68/ao3c03663_0010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ce18/10448649/5379ca941edf/ao3c03663_0001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ce18/10448649/99ec09a0a65d/ao3c03663_0006.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ce18/10448649/5379ca941edf/ao3c03663_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ce18/10448649/43614968d85d/ao3c03663_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ce18/10448649/4c6e8b307daa/ao3c03663_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ce18/10448649/6a2ef019684d/ao3c03663_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ce18/10448649/11ddc49b7e6b/ao3c03663_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ce18/10448649/99ec09a0a65d/ao3c03663_0006.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ce18/10448649/005bfc855d68/ao3c03663_0010.jpg

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本文引用的文献

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Impact of tannic acid on nisin encapsulation in chitosan particles.单宁酸对壳聚糖颗粒中乳链菌肽包封的影响。
Int J Biol Macromol. 2023 Apr 1;233:123489. doi: 10.1016/j.ijbiomac.2023.123489. Epub 2023 Feb 2.
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Technological Application of Tannin-Based Extracts.单宁基提取物的技术应用。
Molecules. 2020 Jan 30;25(3):614. doi: 10.3390/molecules25030614.
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Selective adsorption of tannic acid on calcite and implications for separation of fluorite minerals.单宁酸在方解石上的选择吸附及其对萤石矿物分离的意义。
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