微细粒锡石的微泡浮选及动力学研究  

Study on Microbubble Flotation and Kinetics of Fine Cassiterite

作　　者：陈国浩 任浏祎[1,2] 曾维能 张喆怡 魏鹏刚 CHEN Guohao;REN Liuyi;ZENG Weineng;ZHANG Zheyi;WEI Peng gang(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Mineral Resources Processing and Environment?Wuhan 430070,China)

机构地区：[1]武汉理工大学资源与环境工程学院,武汉430070 [2]矿物资源加工与环境湖北省重点实验室,武汉430070

出　　处：《有色金属（选矿部分）》2022年第3期20-25,共6页Nonferrous Metals（Mineral Processing Section）

基　　金：国家自然科学基金资助项目(51504175);湖北省自然科学基金资助项目(2019CFB533)。

摘　　要：微泡浮选是目前解决微细粒锡石难选问题的有效途径。针对-10μm的锡石颗粒,采用微泡浮选法,拟通过微纳米气泡发生器产生的气液混合物对其进行预处理,考查浮选行为及机理,并研究微细粒锡石微泡浮选体系的动力学。结果表明,辛基异羟肟酸浮选细粒锡石的适宜pH值为9,捕收剂浓度为45 mg/L,此时浮选回收率达到最佳,为84.20%。在相同浮选条件下,经微泡活化后的细粒锡石浮选回收率可达86.90%,细粒锡石的浮选回收率有所提高。对微泡活化前后的细粒锡石进行分批刮泡试验、一阶经典浮选动力学模型和二阶浮选动力学模型拟合,结果表明,细粒锡石符合一阶经典浮选动力学模型,对一阶动力学模型进行深入分析认为,微泡活化提高了细粒锡石的浮选速率常数。高速摄影仪测试表明,微泡活化后的细粒锡石颗粒发生团聚,增加了其表观粒径,进一步明晰了微泡强化细粒锡石浮选回收的机理。Microbubble flotation is an effective way to solve the difficult separation problem of fine cassiterite.For cassiterite particles of-10μm,microbubble flotation method was adopted to pretreat the cassiterite particles by the gas-liquid mixture produced by the micro-nano bubble generator,to investigate the flotation behavior and mechanism,and to study the dynamics of the micro-fine cassiterite microbubble flotation system.The results showed that the optimal flotation recovery of fine cassiterite with octyl hydroxamic acid was 84.20%when the optimum pH value was 9 and the concentration of collector was 45 mg/L.Under the same flotation conditions,the flotation recovery of fine cassiterite after microbubble activation can reach 86.90%,and the flotation recovery of fine cassiterite has been improved.Batch test,first-order classical flotation kinetic model and second-order flotation kinetic model fitting were carried out on the fine cassiterite before and after microbubble activation.The results showed that the fine cassiterite conformed to the first-order classical flotation kinetic model.Further analysis of the first-order kinetic model showed that the microbubble activation improved the flotation rate constant of fine cassiterite.High-speed camera test showed that the fine cassiterite particles agglomerate after microbubble activation,which increased its apparent particle size,and further clarified the mechanism of microbubble enhanced fine cassiterite flotation recovery.

关 键 词：锡石 细粒浮选 微泡浮选 浮选动力学 

分 类 号：TD923[矿业工程—选矿]