干法棒磨与球磨对炼焦中煤解离特性及磨矿产物浮选影响

Effect of dry rodmill and ball mill on liberation characteristics of coking middlings and flotation of grinding products

为探究干法棒磨与球磨对炼焦中煤解离特性与磨矿产物浮选回收效果的影响,采用筛分、浮沉、分步释放浮选试验,探究了干法棒磨与球磨条件下炼焦中煤的解离特性与磨矿产物的浮选行为,应用接触角测量仪、红外光谱仪以及X射线光电子能谱仪,研究了2种磨矿方式解离获得的煤表面性质。结果表明:与球磨相比,棒磨对炼焦中煤解离的选择性较好且磨矿产物过粉碎程度显著降低;棒磨产物的浮选指标明显优于球磨产物,主要原因是棒磨产物中煤与矿物质解离程度更高,且其粒度组成更有利于浮选回收;2种磨矿方式解离释放的煤表面性质基本相同。

In order to explore the effect of both dry rod mill and ball mill on the liberation characteristics of coking middlings and the flotation performance of grinding products obtained with two grinding methods.The liberation characteristics of coking middlings under dry rod mill and ball mill conditions were studied by size analysis and float-and-sink tests,and the flotation performance of grinding products were analyzed by progressive released flotation tests.Furthermore,the surface properties of coal,liberated from the coking middlings by the two grinding methods,were examined using the contact angle measuring instrument,infrared spectrometer,and X-ray photoelectron spectroscopy.The results indicated that,compared with ball mill,the rod mill has a better selectivity for liberating the coking middlings,and the degree of over-grinding in the grinding products obtained with the rod mill was also significantly lower.The flotation indexes of rod grinding products were obviously better than that of ball grinding products.The main reasons are that the rod grinding products had a higher liberation degree between the locked coal and minerals,and its particle size distribution was more suitable for flotation.The surface properties of coal released from the middlings by two grinding methods were essentially the same.