(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
（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
