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The Experimental Research On Direct Reduction Of Iron Scrap Immixed With Waste Plastics

Posted on:2007-06-28Degree:DoctorType:Dissertation
Country:ChinaCandidate:S W ChenFull Text:PDF
GTID:1101360185977718Subject:Metallurgical physical chemistry
Abstract/Summary:PDF Full Text Request
There are mass of plastic production and consume in China. A great number of waste plastics cause a serious environment pollution. Taking the waste plastics as metallurgical resource and combining the waste plastics processing and the solid carbon direct reduction of sponge iron can not only protect the environment but also make a full use of this kind of potential resource. That will affect deeply the on-going economic and social development in our country due to its outstanding economic and social benefit. The research project is founded by national natural science foundation of China and BAOSWTEEL steel unite foundation (No.50174001). The aim of this article is to investigate the reduction mechanism and reduction properties of iron scraps immixed waste plastics and explore the effect of immixed waste plastics on iron scrap direct reduction. As a fundamental research, the result, of course, is significant to realize waste plastics as metallurgical materials.Analogous Hoganas gas-solid direct reduction system which is composed of Muffle stove is established and three kinds of waste plastics including ABS, PC and PET are chosen in the experiment. From the orthogonal experiments, it was found that the influence factors of metalation ratio are reduction temperature, reduction time and addition level of waste plastics.Reduction of iron scrap belongs to porous gas-solid reaction. Porosity of the samples and spatial structure of pore directly influence heat transfer, gas diffusion and interfacial-chemical reaction of the system and so on. Therefore, the pore was studied in this paper. In the process of iron scrap reduction, the pore growth obey the kinetics equation of consolidation at high temperature. In this article, The pore structure was studied by the fractal geometry. The results show that compared with situation of without carbon immixed, the fractal dimension increases by the PC, spatial structure of the pore changes by the PC.Through plastic particles microcosmic reduction experiments, it is proved that immixed waste plastics can improve the reduction material column porosity. At the same time, by the microstructure and composition of the reduction reaction, carbon can be separated out in the process of reduction reaction with waste plastics added...
Keywords/Search Tags:Iron scrap, waste plastics, direct reduction, thermodynamics, kinetics, pore
PDF Full Text Request
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