岩盤力学・開発機械

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[1507] Induced oxidation effects on physical and mechanical properties of lignite

^○ＡＫＭＢａｄｒａｕｌＡｌａｍ¹, 荒牧憲隆¹, 玉村修司¹, 藤井義明², 金子勝比古¹ (1..公益財団法人北海道科学技術総合振興センター, 2.北海道大学大学院)

司会:坂口清敏(東北大学)

Keywords:

SCG method,Induced oxidation,Lignite,physical properties,mechanical properties

To produce Low Molecular Weight Organic Compound (LMWOC), the H₂O₂ solution is being considered for bio-methane production in the Subsurface Cultivation and Gasification (SCG) method. Core samples of about 30 mm in diameter and 60 mm in height were prepared from the lignite blocks collected from stream side in Horonobe, Hokkaido were submerged into 1% H₂O₂ solution. The changes in physical and mechanical properties were observed by measuring the size, weight, ultrasonic velocity and uniaxial compression test. The swelling, leaching and breakage processes were in action due to reaction of lignite with the H₂O₂ solution. The density slightly increased and then decreased, and the ultrasonic velocity decreased with reaction time. The mechanism of the phenomenon was mainly due to change in mineral grains forming LMWOC and of microcracks. Lignite became relatively weaker and less stiff after reaction.