Study on the method for the merger of coal screening and sink-and-float data

To meet the need for the consolidation of the respective screening data and float-and-sink data of a group of samples collected from the same coal seam,a study is made of the method for the merger of the respective data based on the relevant screening and float-and-sink actually obtained with coal samples. The paper presents an introduction to the method of arithmetic means used for the combination of the data and the way for the assessment of the grade of washability of the coal in an area under exploration using the consolidation data as mentioned above. The result shows that the merged screening data and float-and-sink data can well reflect their respective basic information,and the data are consistent with each other before and after consolidation is made.