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32卷    第5期    总第278期    2022年5月

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文章编号:1004-0609(2022)-05-1479-12
微纳米气泡对微细粒锡石团聚影响的可视化研究
任浏祎1, 2,曾维能1,张喆怡1,魏鹏刚1

(1. 武汉理工大学 资源与环境工程学院,武汉 430070;
2. 武汉理工大学 矿物资源加工与环境湖北省重点实验室,武汉 430070
)

摘 要: 为探究微纳米气泡对微细粒锡石团聚状态的影响,在细粒锡石微泡浮选研究基础上,结合矿物接触角和Zeta电位测试研究微纳米气泡对锡石颗粒表面性质的影响,利用显微镜、扫描电子显微镜、高速摄影仪对颗粒的团聚状态进行可视化研究,并使用Image-J图像处理软件进行统计分析。结果表明:微纳米气泡的引入能有效地提高-10 μm粒级锡石的浮选回收率,最佳条件下微泡浮选回收率达到94.05%,较常规浮选提高约7%;Zeta电位测试结果表明微纳米气泡的引入会降低矿物表面电位的绝对值,使分散体系的稳定性降低,颗粒之间更易发生团聚;微纳米气泡能明显改变锡石疏水性以及团聚状态,引入微纳米气泡后,锡石表面接触角达到79°,形成矿物集合体颗粒的d50=25.5 μm,远高于原矿的d50=6.9 μm。

 

关键字: 微细粒锡石;微泡浮选;可视化;图像处理

Visualization of effect of micro-nano bubbles on agglomeration of fine cassiterite
REN Liu-yi1, 2, ZENG Wei-neng1, ZHANG Zhe-yi1, WEI Peng-gang1

1. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Wuhan 430070, China

Abstract:In order to explore the influence of micro-nano bubbles on the agglomeration state of fine-particle cassiterite, based on the investigation of fine-particle cassiterite micro-bubble flotation, combined with mineral contact angle and Zeta potential test to explore the effect of micro-nano bubbles on the surface properties of cassiterite particles, the microscopes, scanning electron microscopes and high-speed cameras were used to visualize the agglomeration state of particles, and Image-J image processing software was used for statistical analysis. The results show that the introduction of micro-nano bubbles can effectively increase the flotation recovery of -10 μm cassiterite. Under the best conditions, the recovery of micro-bubble flotation reaches 94.05%, which is about 7% higher than that of conventional flotation. The Zeta potential test results show that the introduction of micro-nano bubbles will reduce the absolute value of the Zeta potential. The stability of the particles is reduced, and the particles are more likely to agglomerate, micro-nano bubbles can significantly change the hydrophobicity and agglomeration state of cassiterite. After the introduction of micro-nano bubbles, the contact angle of cassiterite reaches 79°, and d50 of the formed mineral aggregate particles is 25.5 μm, much larger than that of the original ore (6.9 μm).

 

Key words: fine-grained cassiterite; microbubble flotation; visualization; image processing

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

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

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