磨矿介质运动状态对锡石多金属硫化物选择性磨矿的影响  

Effect of the state of grinding media on the selective grinding of cassiterite polymetallic sulfides

作　　者：陈勇 宋永胜[1,3] 温建康 李文娟 CHEN Yong;SONG Yongsheng;WEN Jiankang;LI Wenjuan(GRINM Resources and Environment Tech.Co.,Ltd.,Beijing 101407,China;State Key Laboratory of Mineral Processing,Beijing 102628,China;National Engineering Research Center for Environment-friendly Metallurgy in Producing Premium Non-ferrous Metals,Beijing 100088,China)

机构地区：[1]有研资源环境技术研究院(北京)有限公司,北京101407 [2]矿物加工科学与技术国家重点实验室,北京102628 [3]高品质有色金属绿色特种冶金国家工程研究中心,北京100088

出　　处：《中国矿业》2021年第12期128-133,共6页China Mining Magazine

基　　金：矿物加工科学与技术国家重点实验室开放基金资助(编号:BGRIMM-KJSKL-2019-08)。

摘　　要：磨矿是实现有用矿物与脉石矿物解离的主要过程,不同矿物之间力学性质不同,因此要求磨矿时具有选择性。介质运动状态对矿石选择性磨矿具有决定性影响,尤其是脆性矿物与硬度较大的矿物共生时,对介质运动状态的调整尤为重要。我国西南地区是我国锡资源的聚集地,矿石中既含有脆性的锡石矿物,又含硬度较大的硫铁矿和石英。针对锡石多金属硫化矿嵌布粒度细、磨矿过程中脆性矿物易过粉碎等问题,采用湿式磨矿的方法研究了矿石在不同磨矿条件下的选择性磨矿行为。研究结果表明:球体介质对于矿石具有较强的冲击破碎力,会对脆性矿物产生过粉碎,不利于后续的选矿作用,添加柱体介质能改善这个问题;提高磨矿浓度和保持较低磨机转速可以改善介质的运动状态,减少冲击破碎作用,增加介质对矿物的研磨作用,避免矿石中产生较多的微细粒,能够产生较好的选择性磨矿作用。因此,在进行含有脆性矿物和大量较硬矿物共生的矿石的磨矿时,应尽量采用球体介质+柱体介质磨矿,降低磨矿转速,适当提高磨矿浓度等措施,以改善矿石受到磨矿介质的应力状态,提高矿石的选择性磨矿效果。Grinding is the main process to realize the dissociation of useful minerals and gangue minerals.Different minerals have different mechanical properties,which require selectivity when grinding.The state of media movement has a decisive influence on the selective grinding of ore,especially when brittle minerals and harder minerals coexist,the adjustment of the media movement state is particularly important.The tin deposits in southwestern are the gathering places of tin resources in our country.The ore contains both brittle mineral cassiterite and harder pyrite and quartz.Aiming at the problem that the cassiterite polymetallic sulfide ore is embedded with fine grain size and brittle minerals are easy to pass through the fans during the grinding process,the choice of ore under different grinding conditions is studied.The research results show that the spherical medium has a strong impact and crushing force on the ore,and it will over-crush the brittle minerals,which is not conducive to the subsequent beneficiation effect.Adding the cylindrical medium can avoid this phenomenon;increase the grinding concentration and keep the mill speed at the low speed are good for selective grinding.Because the low speed of the mill can change the motion state of the medium,reducing the crushing effect,increase the grinding effect of the hard minerals,avoid the production of more fine particles in the grinding.Therefore,in the process of grinding ore containing brittle minerals and a large number of hard mineral symbiotic ore,using sphere medium and column medium grinding ore,reduce grinding speed,appropriately improve the concentration of grinding ore and other measures to improve the stress state of the ore by the grinding medium,can improve the selective grinding effect of the ore.

关 键 词：锡石 闪锌矿 磨矿介质 选择性磨矿 

分 类 号：TD92[矿业工程—选矿]