Study On The Influence Of Ultrafine Grinding To Single Coal Coking Property

In order to solve the contradiction between the less reserves of High-quality cokingcoal and highly dependent on High-quality coking coal when Blending coking. It is the keyresearch direction of coking industry that configurates weak caking coal material as muchas possible in the premise of coke quality, and saves high-quality coking coal resources.This paper studies the influence of grain fineness distribution of weak caking coal toits coking property by mechanical crushing the weak caking coal. The weak caking coalwas crushed below the following size:3,2,1,0.5,0.3,0.2,0.1,0.074mm. Then chargedthe coal which blending with coking coal by70%and with weak caking coal by30%. SSIPRI and PSR were detected. Research shows that the structure strength of coke achievesmaximizing when lean coal and meager lean coal are crushed to particle size of0.1mm.andanthracite blind coal is crushed to the size of0.3mm. And that the structure strength ofcoke becomes obviously degradating when weakly caking coal is crushed to of0.1mm, andgas coal is crushed to particle size of0.3mm. The reactivity of coke rises as particle size ofhigh rank coal decreases. The reaction intensity increases first, then decreases. Thereactivity of coke rises as particle size of low rank coal decreases. While the reaction ontensity presents trend of deterioration.With polarizing microscope for the tool, the influence of the decreasing of the particlesize of high rank coal on the organization distribution of the coke is discussed. Researchshows that the particle size of high rank coke has no influence on the coke’s organizationdistribution. With XRD for the tool, however, the results show that decreasing of particlesize does not affect the coke microcrystalline structure of La, while the stack height ofcoke microcrystalline increasing first and then deceasing, as particle size decreases.Pore structure of cokes characterized by using microscopic image analysis, the resultsshow that the porosity of coke decreases with decreasing of high ranks of coal size, the lowrank coals material’s size reduction’s impact to coke porosity is not obvious.