Effect of the catalyzing combustion of coke breeze on the energy saving in sinter process

Abstract

The mechanism of additive ZC-1 for catalyzing combustion of coke breeze in sintering of iron ore fines was studied by using X-ray Diffraction, TGA and GC(Gas Chromatographer), by which energy saving was achieved on sinter pot test. The results show that the distance between cleavage planes is enlarged and the π-electrons are re-distributed because of the insertion of cations/molecules of ZC-1 into the cleavage planes of carbon, resulting in the weakening of C-C bond, improving the adsorption of oxygen and lowering the activation energy of gasification of carbon from 25.8 kJ/mol to 18.9 kJ/mol, and the burning rate being increased and combustion residual reduced, all of which can lead to lower solid fuel consumption. Compared with the sintering test without addition of additives, the solid fuel consumption is reduced by 16.0%, meanwhile, the rate of finished sinter, the output of finished sinter and the tumbling index are increased by 2.03%, 7.0% and 3.71%, respectively, with incorporating 0.2% of additive ZC-1 in the sintering mixture, which is in agreement with the catalyzing mechanism of ZC-1.

Keywords

sintering / coke breeze / additive / catalyzing combustion / energy saving

References

[1] LiShou-bao, PanBao-ju, RenZi-guo. Approaches to lower energy consumption in sintering[J]. Sintering and Pelletizing, 1996, 21(3): 5-8(in Chinese)

[2] ChenChong-bao. The present situation of energy consumption and the future countermeasure for energy saving for sintering[J]. Sintering and Pelletizing, 1997, 22(5): 11-15(in Chinese)

[3] BallD FAgglomeration of iron ores[M], 1972, London, Heinemann Educational Books Limited

[4] FuJu-ying, JiangTao, ZhuDe-qingPrinciple and technology of sintering and pelletizing, 1996, Changsha, Central South University of Technology Press: 48-57(in Chinese) [M]

[5] FuJu-ying. Investigation of the mechanism of catalyst’s strengthening sinter process[J]. Sintering and Pelletizing, 1999, 24(5): 11-14(in Chinese)

[6] ZhuShen-yong, WeiZhen-qian, TangZhuan-liu. Catalysis and combustion-supporting agents to reduce fuel consumption of sinterin[J]. Sintering and Pelletizing, 1997, 22(6): 9-12(in Chinese)

[7] HanZhao-canFuel and Combustion[M], 1993, Beijing, Metallurgical Industry Press: 92-94(in Chinese)

[8] MckeeD WChemistry and physics of carbon [M], 1991, New York, Marcel Dekker: 173-173

[9] VincettMark E, TsamopoulosJ A, LundC R F. Carbon gasification by group VIII metal catalysts[J]. J Catal, 1990, 126: 279-279

[10] ZhangZen-ruModern measurement techniques for rocks and minerals (in Chinese) [M], 1986, Changsha, Central South University of Technology Press: 8-9