China University of Mining and Technology (CUMT)

Zte Corporation

Enhui Zhou

Bo Zhang

Yuemin Zhao

Yongxin Ren

Liang Dong

Chenlong Duan

Zhenfu Luo

Hongjian Wang

Yadong Zhang

Guanghui Yan

Zongsheng Sun

Xianliang Meng

Nan Zhou

Provided is a method for upgrading a coal slime through synergistic dehydration, including: subjecting coal slime water to be treated to filter pressing dehydration to obtain a filter cake; and crushing the filter cake, sieving and sizing, and subjecting a resulting oversize to steam transient dehydration to obtain a dehydrated coal slime.

Method for upgrading coal slime through synergistic dehydration

The present invention is directed towards a process for upgrading lignite comprising: prior to production pre-assess the calorific value of the coal, by selecting a relational expression between a calorific value of lignite and a degree of metamorphism, a moisture content and an ash content thereof based on a ratio of the ash content to the moisture content, pre-assess the calorific value of the coal; combining a relational expression between a production cost and the ash content and moisture content to make a cost budget; determining degrees of deashing and drying; selecting and implementing a lignite ash reduction pretreatment process; and implementing dry sorting first and then drying. The upgrading process has high sorting efficiency, high drying efficiency and low production cost, and meets the requirement for the surface moisture of the raw coal in the dry sorting operation.

Method and process for upgrading lignite by collaborative optimization of drying and dry sorting

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Xuzhou, China

Enhui Zhou