9.褐炭の金属イオン交換特性 : 低温加熱処理時の構造変化のイオン交換による評価

概要

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The structural changes in brown coal during low-temperature heat treatment were examined by metallic ion exchange. The heat treated coal at 300℃ did not show any exchanging ability of the protonic ions with the metallic ions, Mg, Co or Ni, while significant exchange of these metallic ions was observed for the coal sample dried in vacuo at 50℃. On the other hand, the coal pre-exchanged with calcium ions showed rather large exchanging ability even after heat treatment at 400℃. This is considered to be due to maintaining the structure surrounding carboxyl groups even at higher temperature treatment by the existence of calcium ions. Further the selectivity of ion exchange using the solution containing two species of metallic cations varied by heat treatment temperature and pH of solution. Which may be caused by shrinkage or relaxation of the brown coal structure. The model of structural changes in brown coals during low-temperature heat treatment was presented on the basis of the above results.
一般社団法人日本エネルギー学会の論文
1997-10-30