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纳米气泡对煤浮选过程中高岭石矿泥覆盖层的影响

Effect of Nanobubbles on the Slime Coating of Kaolinite in Coal Flotation.

作者信息

Li Panwu, Zhang Ming, Lei Wang, Yao Wei, Fan Rong

机构信息

College of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.

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

出版信息

ACS Omega. 2020 Sep 17;5(38):24773-24779. doi: 10.1021/acsomega.0c03380. eCollection 2020 Sep 29.

DOI:10.1021/acsomega.0c03380
PMID:33015495
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7528324/
Abstract

Understanding the coating behavior of fine gangue slimes in the presence of nanobubbles (NBs) is important for the application of NB technology in flotation. In this study, slime coating of kaolinite in the flotation of a low-ash coal using deionized (DI) water and NB water was investigated. Kaolinite was found to depress coal flotation by the formation of coating on coal surfaces, but its deleterious effect was less pronounced in the NB water with mitigated slime coating. Setting tests, Brunauer-Emmett-Teller surface area measurements, and dynamic light scattering were conducted to understand the underpinning mechanism. In comparison with DI water, the degree of kaolinite aggregation was enhanced in the NB water. The intensified self-aggregation of kaolinite platelets which appears to be induced by the presence of NBs reduces the solid-liquid interfacial area as well as the number of free kaolinite particles in the suspension, mitigating the coating of kaolinite on coal surfaces in NB water flotation.

摘要

了解细粒煤矸石矿泥在纳米气泡（NBs）存在下的包覆行为对于NB技术在浮选中的应用至关重要。在本研究中，研究了在使用去离子（DI）水和NB水浮选低灰煤时高岭土的矿泥包覆情况。发现高岭土通过在煤表面形成包覆层来抑制煤的浮选，但其有害影响在具有减轻矿泥包覆的NB水中不太明显。进行了沉降试验、布鲁诺尔-埃米特-泰勒比表面积测量和动态光散射，以了解其潜在机制。与去离子水相比，高岭土在NB水中的聚集程度增强。由NBs的存在引起的高岭土片层的强化自聚集减少了固液界面面积以及悬浮液中游离高岭土颗粒的数量，从而减轻了NB水浮选中高岭土在煤表面的包覆。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c4a/7528324/7b1346c0df7a/ao0c03380_0009.jpg
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Application of the Diffused Double Layer Theory to Nanobubbles.扩散双电层理论在纳米气泡中的应用。
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