Optimization of the crushed middlings rewashing process of Tangkou Coal Preparation Plant
AN Quan
KONG Lingchao
CHE Lirun
HAN Feng
Abstract：In producing the grade-8 clean coal by Tangkou Coal Preparation Plant,it is found that the middlings product still contains some coal that is up to the standard of the grade-10 clean coal in quality indices.To address this issue,work is made on screening and float-and-sink analysis of the middlings be-fore and after crushing to explore the conditions required for the recovery pf the grade-10 coal from the middlings before its crushing and after it is crushed down to a size of 6 mm or 3 mm.Test result show that the higher the degree of liberation of the intergrown coal,the more conducive it is to the recovery of the coal;and when viewed from the perspective of yield of clean coal and amount of fine coal generated through crushing of middlings,a relatively higher recovery of the coal can be obtained when the middlings are crushed down to size of 6 mm.On the basis of the test results,the middlings rewashing process of the plant is optimized through addition of sizing screen and crusher,allowing the plant to see a rise of the yield of clean coal by 0.56 percentage point.
Keywords：rewashing of middlingscrushed middlings rewashing processscreen and float-and-sink a-nalysisbreaking sizeyield of clean coal
Publication Date：2023-08-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 44-49 )