充气机械搅拌式浮选机内浮选动力学过程分区模型

Zoning model of flotation kinetics process in air-forced mechanical agitator flotation machine

随着矿产资源需求的持续增加,选矿厂处理规模急剧增大,面临着入选矿石品位持续变低、浮选机容积不断增大与回收率稳定或提升的挑战.因此很有必要开展浮选机内浮选动力学过程分区模型研究,为指导大型浮选机分选过程强化奠定基础.论文建立了实验室尺度LFM-30型和工业尺度KYF-130型充气机械搅拌式浮选机试验系统,采用高速摄像、深槽取样和原位气泡负载测试等方法,开展了单颗粒运动轨迹、浮选过程中颗粒的悬浮特征、矿化气泡上浮过程中负载变化特征、矿浆与泡沫界面区域颗粒脱落等研究.基于研究结果提出了具有循环区、搅拌混合区、运输区、分离区、泡沫区和泡沫矿浆界面区的“五分区+相界面”动力学过程模型,为应对不同矿石性质变化开展工业尺度浮选机优化设计奠定一定的基础.

With the continuous increase of the demand for mineral resources,the throughput of the concentrator increases sharply,which needs to face the challenges of ore grade continuously lowering,flotation machine volume increasing and valuable mineral recovery keeping stable or improved.Therefore,it is necessary to study the zoning model of flotation kinetics process in flotation machine,so as to lay a foundation for guiding the process reinforcement of large flotation machine.In this paper,the laboratory scale LFM-30 and industrial scale KYF-130 air-forced mechanical agitation flotation machine test system was established,using high speed camera,different depths in tank samplers and in-situ bubble load tester,the trajectory of single particle,solid suspension characteristics,the variation characteristic of the load of bubbles with its rising,and the particle shedding in the interface area between slurry and froth were studied.Based on the above research results,a“five-zone+phase interface”dynamic process model was proposed,which includes circulation zone,mixing zone,transportation zone,separation zone,froth layer zone and froth pulp interface zone.The model lays a certain foundation for the optimization design of industrial flotation machine in response to the change of different ore properties.