Properties of binderless coal slime briquette via hydrothermal hot pressing dewatering

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.

KEYWORDS:

• Binderless briquetting
• Coal slime
• dewatering
• hydrothermal hot pressing
• optimizing conditions

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.

Additional information

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.