Nipa palm is one of the non-wood plants rich in lignocellulosic content.In this study,palm fronds were converted into activated carbon,and their physical,chemical,and morphological properties were characterized.The re...Nipa palm is one of the non-wood plants rich in lignocellulosic content.In this study,palm fronds were converted into activated carbon,and their physical,chemical,and morphological properties were characterized.The resulting activated carbon was then applied as an adsorbent of Fe metal in peat water.The carbonization process was carried out for 60 min,followed by sintering at 400℃ for 5 h with a particle size of 200 mesh.KOH and H_(3)PO_(4) were used in the chemical activation process for 24 h.KOH-activated carbon contained 6.13%of moisture,4.55%of ash,17.02%of volatile matter,and 78.84%of fixed carbon,while its Fe reduction efficiency was 28.09%.The H_(3)PO_(4)-activated carbon contained 4.67%of moisture,2.84%of ash,16.41%of volatile matter,and 80.57%of bonded carbon,and the Fe reduction efficiency was 52.25%.KOH-activated carbon and H_(3)PO_(4)-activated carbon contained fixed carbon of 78.84%and 80.57%,respectively,while their average rates of efficiency of Fe reduction were 22.82%and 39.23%,respectively.Overall,the characteristics of activated nipa carbon met the Indonesian standards(SNI No.06-3730-1995).However,H_(3)PO_(4)-activated carbon was found to be better at adsorbing Fe metal from peat water.展开更多
Based on the statistical data of 26 outburst prone coal seams in China, this paper presents the relationship among the threshold gas pressure in coal and gas outburst and the volatile content and hardness of coal by m...Based on the statistical data of 26 outburst prone coal seams in China, this paper presents the relationship among the threshold gas pressure in coal and gas outburst and the volatile content and hardness of coal by mathematical statistics. The threshold value of gas pressure for outburst pmin in MPa may be calculated by formula Pmin =5(0. 1+0. 07Kf), where / is the hardness and V the volatile content (%) of a soft bed. In China, the value of Pmin of some outburst prone coal seams ranges from 0. 57 to 0. 1 MPa.展开更多
The semicokes from different coals were prepared under various temperatures by partial gasification method in a fixed bed. According to the analysis of the Vaaf in the coals and semicokes, a new method is presented to...The semicokes from different coals were prepared under various temperatures by partial gasification method in a fixed bed. According to the analysis of the Vaaf in the coals and semicokes, a new method is presented to predict the content of remnant volatile matter in the semicokes from coal partial gasification. The two fuel character indexes FV and FC were introduced to symbolize the second volatilized temperature and the fully volatilized temperature respectively. Then according to the proximate and ultimate analysis data of raw coal, the content of Vdaf in the semicokes prepared under various temperatures can be predicted.展开更多
文摘Nipa palm is one of the non-wood plants rich in lignocellulosic content.In this study,palm fronds were converted into activated carbon,and their physical,chemical,and morphological properties were characterized.The resulting activated carbon was then applied as an adsorbent of Fe metal in peat water.The carbonization process was carried out for 60 min,followed by sintering at 400℃ for 5 h with a particle size of 200 mesh.KOH and H_(3)PO_(4) were used in the chemical activation process for 24 h.KOH-activated carbon contained 6.13%of moisture,4.55%of ash,17.02%of volatile matter,and 78.84%of fixed carbon,while its Fe reduction efficiency was 28.09%.The H_(3)PO_(4)-activated carbon contained 4.67%of moisture,2.84%of ash,16.41%of volatile matter,and 80.57%of bonded carbon,and the Fe reduction efficiency was 52.25%.KOH-activated carbon and H_(3)PO_(4)-activated carbon contained fixed carbon of 78.84%and 80.57%,respectively,while their average rates of efficiency of Fe reduction were 22.82%and 39.23%,respectively.Overall,the characteristics of activated nipa carbon met the Indonesian standards(SNI No.06-3730-1995).However,H_(3)PO_(4)-activated carbon was found to be better at adsorbing Fe metal from peat water.
文摘Based on the statistical data of 26 outburst prone coal seams in China, this paper presents the relationship among the threshold gas pressure in coal and gas outburst and the volatile content and hardness of coal by mathematical statistics. The threshold value of gas pressure for outburst pmin in MPa may be calculated by formula Pmin =5(0. 1+0. 07Kf), where / is the hardness and V the volatile content (%) of a soft bed. In China, the value of Pmin of some outburst prone coal seams ranges from 0. 57 to 0. 1 MPa.
基金supported by Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KGCX2-YW-321)the National Natural Science Foundation of China (Grant No. 50776099)the Ex-cellent Youth Teacher Foundation of Anhui Province (Grant No.2011SQRL031)
文摘The semicokes from different coals were prepared under various temperatures by partial gasification method in a fixed bed. According to the analysis of the Vaaf in the coals and semicokes, a new method is presented to predict the content of remnant volatile matter in the semicokes from coal partial gasification. The two fuel character indexes FV and FC were introduced to symbolize the second volatilized temperature and the fully volatilized temperature respectively. Then according to the proximate and ultimate analysis data of raw coal, the content of Vdaf in the semicokes prepared under various temperatures can be predicted.
