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ABSTRACT
Dewatering and binderless briquetting of Liulin coal slime by hydrothermal hot pressing (HHP) method were studied under a wide range of process conditions. Fourier transform infrared spectroscopy and XRD were used for characterization. Results indicated that the optimal conditions were a pressure at 4.2 Mpa, a temperature of 150℃, and additive NaOH at 3.0%. The increase of temperature caused the loss of absorbed water in clay minerals and also some organic species having functional groups, such as -CH3 and -CH2. The alkalinity caused the loss of oxygen functional groups and the formation of hydroxysodalite, which reduced the water storage capacity and promoted coal particles agglomeration.
Funding
This work was supported by coal-base low-carbon mutual funds of Shanxi (U161020028), Shanxi Provincial Science and Technology Major Projects (MD2015-01), Coal-based key Science and Technology Development Program of Shanxi (MD2014-03). The authors would like to thank China Guodian Corporation, Jinneng Group CO., LTD. and Gemeng International CO., LTD. for their support.