煤焦化过程中矿相转变规律
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摘要
利用XRD和物相定量分析方法研究了南桐和永混煤及含添加剂的南桐煤在焦化过程中的矿相转变规律.结果表明,南桐煤焦化过程中,占灰分含量46.03%的高岭土完全分解,其中65.24%分解生成莫来石,17.02%分解生成方石英和γ氧化铝.灰分中石英类矿物含量由19.57%升至35.48%,含量为7.83%的黄铁矿中89.53%转化为磁黄铁矿,含量为17.64%的方解石完全分解且部分生成Ca H2PO4.永混煤焦化过程中,除方解石主要转化为褐硫钙石和硬石膏之外,其他矿物质的转变规律与南桐煤相近.在南桐煤中添加5%Ca O和Fe2O3焦化后,主要产物莫来石相较于添加前分别下降4.80%和5.68%,石英类矿物下降21.17%和20.17%.同时,添加剂提高了焦炭中含钙和含铁催化性矿物的含量,且焦炭的反应性分别提高31.45%与15.05%.
XRD and general structure analysis system were used to studied transformation of minerals in Nantong and Yonghun coals, and Nantong coal with additives in their coking process. The results showed that kaolinite at 46.03% of the ash content was decomposed completely, 65.24% of kaolinite decomposed to mullite, and the other 17.02% to cristobalite and γ-alumina. In addition, the quartz mineral content in the ash was increased from 19.57% to 35.48%. 89.53% of pyrite with the content of 7.83% in the ash was converted into pyrrhotite. Calcite with the content of 17.64% was decomposed completely, and partially converted into Ca H2PO4. During coking process of Yonghun coal, the transformation rule of other minerals was similar to that of Nantong coal, except that calcite was mainly converted to oldhamite and anhydrite. Under the addition of Ca O and Fe2O3 with the content of 5% of the coal into Nantong coal, the content of mullite was decreased by 4.80% and 5.68%, and that of quartz minerals by 21.17% and 20.07%, respectively. Adding reagents could improve the content of minerals containing calcium and iron in the coke, the coke reactivity index was increased by 31.45% and 15.05%, respectively.
XRD and general structure analysis system were used to studied transformation of minerals in Nantong and Yonghun coals, and Nantong coal with additives in their coking process. The results showed that kaolinite at 46.03% of the ash content was decomposed completely, 65.24% of kaolinite decomposed to mullite, and the other 17.02% to cristobalite and γ-alumina. In addition, the quartz mineral content in the ash was increased from 19.57% to 35.48%. 89.53% of pyrite with the content of 7.83% in the ash was converted into pyrrhotite. Calcite with the content of 17.64% was decomposed completely, and partially converted into Ca H2PO4. During coking process of Yonghun coal, the transformation rule of other minerals was similar to that of Nantong coal, except that calcite was mainly converted to oldhamite and anhydrite. Under the addition of Ca O and Fe2O3 with the content of 5% of the coal into Nantong coal, the content of mullite was decreased by 4.80% and 5.68%, and that of quartz minerals by 21.17% and 20.07%, respectively. Adding reagents could improve the content of minerals containing calcium and iron in the coke, the coke reactivity index was increased by 31.45% and 15.05%, respectively.
引文
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[2]Grigore M,Sakurovs R,French D,et al.Influence of Mineral Matter on Coke Reactivity with Carbon Dioxide[J].ISIJ Int.,2006,46(4):503-512.
[3]Nomura S,Terashima H,Sato E,et al.Some Fundamental Aspects of Highly Reactive Iron Coke Production[J].Journal of the Iron and Steel Institute of Japan,2006,92(12):849-856.
[4]Tomita A.Catalysis of Carbon–gas Reactions[J].Catalysis Surveys from Japan,2001,5(1):17-24.
[5]李建欣.XRD全谱拟合精修对贵州煤中矿物质的定量研究[D].焦作:河南理工大学,2009.
[6]Vassileva C G,Vassilev S V.Behaviour of Inorganic Matter during Heating of Bulgarian Coals:Subbituminous and Bituminous Coals[J].Fuel Process.Technol.,2006,87(12):1095-1116.
[7]Gotor F J,Macias M,Ortega A,et al.Comparative Study of the Kinetics of the Thermal Decomposition of Synthetic and Natural Siderite Samples[J].Phys.Chem.Miner.,2000,27(7):495-503.
[8]Grigore M,Sakurovs R,French D,et al.Effect of Carbonisation Conditions on Mineral Matter in Coke[J].ISIJ Int.,2007,47(1):62-66.
[9]刘桂建,王俊新,杨萍玥,等.煤中矿物质及其燃烧后的变化分析[J].燃料化学学报,2003,31(3):215-219.
[10]白进,李文,李保庆.高温弱还原气氛下煤中矿物质变化的研究[J].燃料化学学报,2006,34(3):292-297.
[11]曹敏,谷小虎,樊崇,等.义马煤灰高温下矿物质变化[J].煤炭转化,2010,33(1):12-15.
[12]李宝霞,张济宇.煤灰渣熔融特性的研究进展[J].现代化工,2005,25(5):22-26.
[13]Ward C R.Analysis and Significance of Mineral Matter in Coal Seams[J].International Journal of Coal Geology,2002,50(1):135-168.
[14]李帆,邱建荣,郑瑛,等.煤燃烧过程矿物质行为研究[J].工程热物理学报,1999,20(2):258-260.
[15]左海滨,戎妍,张建良,等.氧化钙对焦炭性能的影响[J].钢铁,2014,49(1):7-12.
[16]Kerkkonen O.Influence of Ash Reactions on Feed Coke Degradation in the Blast Furnace[J].Coke Making International,1997,9(2):34-41.
[17]Gupta S,Dubikova M,French D,et al.Characterization of the Origin and Distribution of the Minerals and Phases in Metallurgical Cokes[J].Energy Fuels,2007,21(1):303-313.
[18]Grigore M,Sakurovs R,French D,et al.Mineral Matter in Coals and Their Reactions during Coking[J].International Journal of Coal Geology,2008,76(4):301-308.
[19]张群,杨俊和.煤中矿物质对焦炭溶损反应的作用[J].煤炭转化,2002,25(1):62-66.
[20]杜鹤桂,杨俊和.矿物质对高炉焦炭溶损反应的催化作用[J].炼铁,2002,21(4):22-24.
[21]张晓林.炭化和气化过程中煤矿物质的转化[J].燃料与化工,2010,41(6):59-60.