69.Ca(OH)_2を用いた石炭の化学的脱灰 : Ca(OH)_2と石炭の水熱反応

概要

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The hydrothermal reaction of Ca(OH)_2 with reagent quartz at temperatures between 175℃ and 340℃ has been studied to obtain fundamental information on coal demineralization with Ca(OH)_2. At a Ca/Si atomic ratio of about 1, quartz was first converted to Ca_2Si_7O_4・H_2O which then reacted with residual quartz or residual Ca(OH)_2, forming a silica-rich phase or a calcium-rich phase, and finally all these intermediate compounds were transformed to xonotlite when a prolonged treatment at high temperature was employed. At higher Ca/Si ratios, a fraction of quartz remained unreacted even after severe treatments. On the basis of the above investigations on model reaction, removal of quartz from coal through Ca(OH)_2/HCl leaching were interpreted.
一般社団法人日本エネルギー学会の論文
1996-10-28