Influence Of Coal Metamorphism On Pore Structure Of Agglomerated Activated Carbon

In this thesis, on the basis of average max reflection rate of vitrinite as the quantitative characteristic of coal metamorphic grade, nine kinds of coals with different metamorphic grade including the lignite from Huolinhe are selected as raw materials and then nine kinds of activated carbon has been preparedcorrespondingly on the same condition of briquetting process. Through the analysis methods suchas SEM, nitrogen adsorption method and mercury intrusion method, the influence of coal metamorphic grade onthe preparation process, pore structure and application performance of the agglomerated activated carbon has been studied systematically. The main conclusions of four aspectsarelistedbelow.1.Coal metamorphicgrade has a significant influence on pore diameter distribution of agglomerated activated carbon. The pore distribution peaks of 3nm～4.5nm decrease as the increasing of coal Metamorphism. The agglomerated activated carbonprepared with low metamorphic gradecoal whose average max reflection rate of vitrinite is 0.3%～0.8% and high metamorphic gradecoal whose average max reflection rate of vitrinite is more than 2% has 0.4nm～0.8nm pore diameter distribution. The agglomerated activated carbonprepared with medium metamorphic grade binding coal whose average max reflection rate of vitrinite is approximately 1% has 1.3nm～1.8nm pore diameter distribution.2.As the improvement of coal metamorphic grade, agglomerated activated carbon has more and more micropore and the development of mesopore and macropore tend to be inadequate, that concrete manifestation is listedbelow. When the average max reflection rate of vitrinite increases from 0.311% to 0.775%, the average pore diameter decreases from 3.718 nm to 1.927 nm and the microporosity rises from 38.06% to 38.06%continually. Moreover, the mesoporosity is gradually decreasing overall and the volume and surface area of macropore both gradually decrease.3. The quantitative relation between coal metamorphism and pore structure of agglomerated activated carbon are established including average pore diameter-average max reflection rate of vitrinite, microporosity-average max reflection rate of vitrinite and mesoporosity-average max reflection rate of vitriniteare regular, that can be nonlinear fitted to mathematical relationships with the modelExpDec、model BiDoseResp and model BiDoseResp respectively, whose correlation coefficients are 0.91,0.96 and 0.93 respectively.4. The quantitative relation between pore structure of agglomerated activated carbon and three adsorption indexes are established. The relationships between carbon tetrachloride value, iodine value and methylene blue value and pore volume, specific surface area present linear relation. And the corresponding linear relationships are fitted.Theconclusions from this paper will provide fundamental basis forthe characteristics prediction of pore structure of agglomerated activated carbon in actual production and regulation of pore structure through coal blending technology.