锡石多金属硫化矿矿石磨矿特性研究

Study on the Grinding Characteristics of Cassiterite Polymetallic Sulfide Ore

针对过磨与欠磨的问题以及磨矿方式和入料粒级对矿石磨矿效果的影响。以锡石多金属硫化矿为研究对象,基于批次磨矿试验,通过改变磨矿方式、入料粒级、磨矿时间等磨矿影响因素,探索磨矿产物粒度分布规律和磨矿行为特性。结果表明,研磨磨矿是一个低能磨矿过程,矿石所受作用力小,易发生欠磨现象。抛落磨矿和冲击磨矿是一个高能磨矿过程,矿石所受作用力大,破碎更加充分,易发生过磨现象。在研磨磨矿下,磨矿技术效率E和磨矿产物t_(10)随磨矿时间变化幅度稳定,产物粒度分布比较均匀;在抛落磨矿和冲击磨矿下,磨矿技术效率E和磨矿产物t_(10)随磨矿时间变化明显,且变化幅度大,总体上两种磨矿指标均大于研磨磨矿。从入料粒级看,矿石的磨矿行为与入料粒级的关系较为复杂,没有明显的规律。研究结果将为后续研究抛落状态下研磨和冲击两种作用力的强弱及其相互影响提供理论依据。

Aiming at the problem of over-grinding and under-grinding and the influence of grinding mode and feed size on ore grinding effect.Cassiterite polymetallic sulfide ore was taken as the research object.The grain size distribution of grinding minerals and grinding behavior characteristics were explored based on batch grinding test,by changing grinding method,feed sizes,grinding time and other factors affecting grinding.It was shown by the results that attrition grinding process was a low-energy grinding,the force of ore was small,and the under-grinding was easy to occur,whereas drop grinding and impact grinding processes were high-energy grinding,the ore was subjected to greater force,more fully broken,easy to occur over-grinding phenomenon.The variation amplitude of grinding technical efficiency E and grinding mineral substance t_(10)was stable with grinding time under grinding conditions,and the product size distribution was uniform.Grinding technical efficiency Eand grinding product t_(10) were changed obviously with the grinding time under drop grinding and impact grinding,and the change range was large,and in general,the two grinding indexes are greater than that of attrition grinding.Complicated and without obvious rule was the relationship between the grinding behavior of ore and the feeding size.A theoretical basis for the subsequent research on the strength and interaction of attrition and impact forces in the dropping state was provided by the research results.