The Research On The Briquetting Mechanism Of Fine Coal

In this paper, Jincheng anthracite, Gujiao coking coal, Datong weakly coking coal and binder l#and binder 2# were selected as the main research objects, and the research of briquetting mechanism of fine coal along with the acting forces among particles in biquette were carried out. Based on such study, the acting forces among particles in briquette were quantitatively expressed by the compressive strength of briquette. The samples were briquetted respectively by universal testing machine, and the compressive strength of briquette was measured. The surface characteristics such as surface humidity, functional groups, specific surface, surface electricity, surface microstructure of coal and briquette were measured by modern technique such as IR, Gas adsorption, SEM. The principles of the Colloid Chemistry, the Solid and Surface Chemistry, the Mechanical Chemistry, the Particle Technology, the Coal Chemistry, the acting force types among the particles in briquette were analyzed. The viewpoint of mechanical chemistry was firstly applied to analyze the forming mechanism of chemical bond. The metamorphic degree of coal, the binder and the briquetting conditions that affect the acting forces were also studied.The research shows that: (1) In briquetting process, fine coal with the binder is the necessary condition of briquetting by which the coal and the binder can moisten each other sufficiently: (2) Various acting forces exist in the briquette including the chemical force, the mechanical force, the solid bridge-bond. Van der waals force and so on: (3) The compressive strength ofbriquette are the result of various acting forces; (4) Different acting forces have different influence on the compressive strength, among which the mechanical force is the most contributive one; (5) Compared FTIR gujiao coal with that of gujiao briquette show that the absorptive crests have obvious difference, new functional groups are formed because of mechanical force during briquetting, which that chemical force does exit among particles.