Experimental Study on Drying and Agglomerating Moulding of Lignite

Due to lignite is a kind of coal with low degree of coalification, low heat value, high moisture content, and prone to weathering and spontaneous combustion, it is not easy for long distance transport. The briquette technology is an effective way to resolve this question. In this study, the lignite from Huolinhe Coalmine was taken as the raw material. By drying it and adding agglomerant into it and letting it go through the physiochemical process, a lignite briquette with improved heat value and some strength was produced, which solved the problems like heat value reduction and the environmental pollution caused by weathering during the lignite transport process, and increased the economic and social benefit of lignite utilization. This study used the agglomerant cold-press molding technique to prepare the briquette, the obtained briquette went through the tests of ash content, heat value, compressive strength, surface behavior etc., and the test results then were analyzed. Meanwhile, this article discussed the acting force types of the particles inside briquette and influencing factors of lignite molding from the point of agglomerating mechanism. The optimal agglomerant type and blending ratio of the agglomerant was determined, which will provide basic consideration for the industrial production of the briquette.