Synergistic reaction behavior of pyrolysis and reduction of briquette prepared by weakly caking coal and metallurgical dust  

作　　者：Zheng-jian Liu Ming-hui Cao Jian-liang Zhang Run-sheng Xu Yao-zu Wang Ji-yong Yu Yu-chen Zhang 

机构地区：[1]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Journal of Iron and Steel Research International》2023年第7期1367-1380,共14页

基　　金：financially supported by the National Natural Science Foundation of China(No.52274316);the State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing(Nos.41620025,41620026,and 41621009);the Interdisciplinary Research Project for Young Teachers of University of Science and Technology Beijing(the Fundamental Research Funds for the Central Universities)(No.FRF-IDRY-20-014).

摘　　要：Co-carbonization of weakly caking coal and zinc-containing dust to prepare highly reactive ferro-coke and collaboratively recover zinc powder is one of the feasible ways for steel enterprises to recycle zinc-containing dust.The pyrolysis mass loss behavior of adding blast furnace dust with different zinc contents to different ferro-coke materials was systematically studied by thermogravimetry and differential thermogravimetry analysis,and the kinetic mechanism of pyrolysis-reduction reaction of hybrid briquette was explored.The results of thermogravimetric curve analysis show that the addition of zinc oxide to the sample has no significant effect on the mass loss rate of the sample below 580℃,and the pyrolysis mass loss of zinc oxide mainly occurs between 800 and 1000℃.Kinetic analysis results show that the pyrolysis of zinc-containing samples is controlled by chemical reactions below 580℃.The reaction at 580–700℃ is controlled by the nucleation and growth model,and that above 700℃ is mainly controlled by diffusion.The results of X-ray diffraction analysis show that the pyrolysis process can effectively remove zinc oxide from ferro-coke.

关 键 词：Zinc-containing dust Weakly caking coal Ferro-coke PYROLYSIS REDUCTION Thermal reaction analysis Kinetic analysis 

分 类 号：TQ536[化学工程—煤化学工程]