炼焦中煤深度降灰的研究

分析了中国炼焦煤的储量及利用情况，从利用中国优质煤炭资源的角度出发，以范各庄选煤厂1．40—1．60密度级中煤为实验煤样，以氯化锌为重液，采用浮沉方法将中煤按密度分级，各密度级煤样经磨细后，采用了絮团——浮选工艺，回收各密度中的低灰精煤；探讨从范各庄选煤厂中煤中分选出优质低灰精煤的条件。经过分级及分选后，在相同的分选密度的情况下，总精煤灰分可以降到8．14％以下。

Study on Depth Depression Ash Content in Coking Middlings

The reserves and utilization situation of coking coal in China were analyzed. Middlings of Fangezhuang Coal Preparation Plant that is 1 40 from to 1 60 density grade is used as experiment test samples for exploration the utilization good quality coal resources of China. Float and sink test are adopted by using the ZnCl 2 as heavy liquid and classification grade was conducted according to the density. And then various density grade coal samples putting into grinding and treatment by using the flocculation-floatation process for recovery the low ash cleaned coal. The conditions of separation the low ash cleaned coal were approached from Fangezhuang middlings. After classification, the total ash is under 8 14% at the same separation density condition.