Binderless briquetting of lignite by the mechanical thermal expression process

作者：Zhang, Yixin; Chen, Xiaokai; Wu, Jianjun^*; Wang, Shuangchao; Shao, Zhongye; Miao, Zhenyong; Xiao, Lei

来源：International Journal of Coal Preparation and Utilization, 2020, 40(6): 389-402.

DOI：10.1080/19392699.2017.1363739

• Binderless briquetting
• humic acid
• lignite
• mechanical thermal expression
• oxygen functional groups

The mechanical thermal expression (MTE) process, which has been widely studied as a dewatering technology, could also be used for the briquetting of lignite. In this study, the effect of operating conditions on the compressive strength and shatter index of briquette produced by the MTE process was investigated. The compressive strength of briquette increased with the increase of pressure and temperature. The increase in pressure and temperature also resulted in a decrease of residual moisture content in briquettes, which had a positive effect on the compressive strength and shatter index. It was demonstrated that the briquettes produced by the MTE process could survive handling and transportation. The dewatering of lignite during the MTE process strengthened the bond between particles, which enhanced the compressive strength of briquette. The presence of humic acid and functional groups, such as carboxyl and hydroxyl, enhanced the compressive strength of briquette by promoting the formation of hydrogen bonds between the surfaces of lignite particles. The combustion efficiencies and particle emission of lignite could be improved by the MTE briquetting process.

• 出版日期2020-6-2
• 单位中国矿业大学（北京）