Electro-flotation and collision-attachment mechanism of fine cassiterite  

细粒锡石的电解浮选及碰撞粘附机理(英文)

作　　者：覃文庆[1] 任浏祎[1] 王佩佩[1] 杨聪仁[1] 张雁生[1] 

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第4期917-924,共8页中国有色金属学报（英文版）

基　　金：Project(50774094)supported by the National Natural Science Foundation of China;Project(2010CB630905)supported by the National Basic Research Program of China

摘　　要：In order to discuss the particle-bubble interaction during the electro-flotation of cassiterite,the recovery of cassiterite with different particle sizes was investigated,and the collision mechanism between the cassiterite particles and H2 bubbles was explored.The flotation tests were carried out in a single bubble flotation cell.The results show that cassiterite particles 10 μm,10-20 μm,20？38 μm and 38-74 μm match with bubbles with size of 50-150 μm,about 250 μm,74 μm and 74 μm,respectively,and a better recovery can be obtained.It is demonstrated that the recovery of cassiterite is influenced by the size of cassiterite particles and bubbles.Furthermore,the probabilities of collision,adhesion,detachment and collection were calculated using the collision,attachment and collection models.Theoretical calculation results show that the collision probability decreases sharply with decreasing particle size and increasing bubble size（below 150 μm）.The attachment probability would increase from the effective collision,leading to the increase of recovery.为了研究细粒锡石电解浮选中颗粒气泡间的相互作用,分析不同粒级锡石的浮选回收率和锡石颗粒与氢气泡的碰撞机理。浮选实验在一个单泡电解浮选装置中进行,实验结果表明,<10μm,10～20μm,20～38μm和38～74μm粒级的锡石分别与50～150μm,约250μm,约74μm和约74μm尺寸的气泡相匹配,可以获得较好的浮选回收率。因此,颗粒和气泡的大小直接影响锡石的浮选回收率。利用碰撞、粘附和捕集模型进行碰撞、粘附、分离和捕集几率的计算。理论计算结果发现碰撞几率随着颗粒尺寸的减小以及气泡尺寸(<150μm)的增大而显著降低。有效的碰撞有利于粘附几率的增加,从而有利于提高浮选回收率。

关 键 词：CASSITERITE particle-bubble interaction fine particle flotation ELECTRO-FLOTATION collision-attachment probability 

分 类 号：TD952[矿业工程—选矿]