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Chen W.-P.,Inner Mongolia University of Science and Technology | Chen W.-P.,Key Laboratory of Integrated Exploitation of Bayanobo Mine Poly metallic Resources | Li G.-W.,Inner Mongolia University of Science and Technology | Zhao Z.-W.,Key Laboratory of Integrated Exploitation of Bayanobo Mine Poly metallic Resources | And 3 more authors.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2015

The effects of type and dosage of coal slime as reducing agent, reduction temperature and time, and dosage of CaCO3 on direct reduction of limonite containing iron oxides were examined. The iron-containing components in reduced product at different conditions were analyzed. The effect of additive dosage on carbon-containing pellet melt decomposition was also studied. The results show that coal slime C is the best reducing agent. The reduced product with metallization rate of 94.02% is obtained under the conditions of coal slime C 30%, CaCO3 3%, and 1250℃ for 30 min. The iron in product is basically metallic iron with the particle sizes over 30 μm. Moreover, addition of 3% CaCO3 makes slag and iron separate apparently, which is conducive to further separation of reduced product. Therefore, the coal slime can be regarded as a good reducing agent for direct reduction of limonite. © 2015, Science Press. All right reserved.


Chen W.-P.,Inner Mongolia University of Science and Technology | Chen W.-P.,Key Laboratory of Integrated Exploitation of Bayanobo Mine Poly Metallic Resources | Xie Z.-H.,Inner Mongolia University of Science and Technology | Zhang H.,Inner Mongolia University of Science and Technology | And 3 more authors.
Journal of Iron and Steel Research | Year: 2015

Energy conservation and emissions reduction ia an important challenge to iron and ateel industry. Renewable biomass-derived reducing agents had gained attention as possible substitutes for fossil-based reducing sgents in the iron making blast furnace. Waste plastic was mixed together with limonite powder and bentonite for producing carbon-containing pellets. The heat released by waste plastic combustion was used as the heat source of pellet prehesting and reduction. Compared with carbon-containing pellets without plastic addition, the porosity of carbon- containing pellets with plastic addition is higher, which makes the process of reducing gas transfer in the pellets easier, so that reduction rate of carbon-containing pellets increases gradually. The effects of reduction time, species and percentage content of waste plastic on the direct reduction of carbon-containing pellets were experimentally studied. The results show that under the optimum parameters of reduction time of 6 mm, temperature of 1 350°C, pellet diameter of 10mm and percentage content of polycarhonate of 4%, the porosity of reduced pellets can be improved by 74%, the reduction rate can be up to 98.89%. Speaking on the reduction system of carboo-containing pellets during the reaction, inside with a certain proportion of waste plastics, reduction time can be shortened, reduction temperature can be reduced and the reduction rate can be improved.


Chen W.-P.,Inner Mongolia University of Science and Technology | Chen W.-P.,Key Laboratory of Integrated Exploitation of Bayanobo Mine Poly Metallic Resources | Xie Z.-H.,Inner Mongolia University of Science and Technology | Zhang H.,Inner Mongolia University of Science and Technology | And 4 more authors.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2014

Polyethylene particles were mixed with limonite powder and bentonite for producing carbon-containing iron ore roasted pellets in order to produce directly reduced iron by direct reduction in a muffle furnace. The effects of reduction temperature, time, molar ratio of carbon to oxygen (C/O) and content of polyethylene on reduction rate of carbon-containing iron ore roasted pellets were studied by orthogonal and single factor experiments. The results showed that the main influential factors include reduction temperature, reduction time, C/O and content of polyethylene. Under the optimum conditions of reduction time of 5 min, temperature of 1350℃, C/O of 1.2 and content of polyethylene of 4%(ω), the reduction rate of pellets can reach up to 99.87%. In addition, the reduction time can be shortened, the reduction temperature reduced, and the reduction rate of the pellets improved by adding a certain proportion of polyethylene. Moreover, adding 2%(ω) CaF2 in the balling process makes slag and iron separate apparently, and separated slag pulverize naturally. This is conducive to further screening for high-quality directly reduced iron. ©, 2014, Science Press. All right reserved.

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