三产品重介质旋流器分选下限的测定

为准确测定无压三产品重介质旋流器的分选下限,分别采用精煤小筛分估计法、精煤小筛分累计灰分估计法和分配曲线精确测定法测定了某炼焦煤选煤厂三产品重介质旋流器的分选下限,并对比分析了3种方法的优缺点和适用范围。结果表明:3种方法测定的无压三产品重介质旋流器的分选下限均大于或等于0.5 mm。精煤小筛分估计法工作量小,测定分选下限较快,但客观性较差;精煤小筛分累计灰分估计法受精煤泥粒度组成影响较大;分配曲线精确测定法能客观测定分选下限,受各方面影响较小,但试验量大。因此,精煤小筛分估计法和精煤小筛分累计灰分估计法适用于选煤厂月、季度评定设备性能,而分配曲线精确测定法适用于科研设计部门研究重选设备性能及新设备正式投入使用前的测定工艺性能环节。

Low separation limit of three-product dense medium cyclone

In order to determine the low separation limit of non-pressure three-product dense medium cyclone,test the low separation limit of three-product dense medium cyclone of a coking coal preparation plant by the way of clean coal sieve analysis and accumulated ash, clean coal sieve analysis and distribution curve determination. Compare the advantages and disadvantages, application scope of the three ways.The results show that the low separation limit determined by the three ways all are equal or greater than 0.5 mm.The way of clean coal sieve analysis needs small workload,a short period of time,but it has poor objectivity.The way of clean coal sieve analysis and accumulated ash is greatly influenced by coal slime size composition.The way of the distribution curve determination can determine the low separation limit objectively,which is less influenced by some facts while it needs heavy workload. So the way of clean coal sieve analysis and clean coal sieve analysis and accumulated ash apply to evaluation of equipment performance monthly or quarterly in coal preparation plant,while the way of the distribution curve applies to study of gravity concentration equipment performance and determination of process before new equipment investment in research design department.