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Effects of pressure and plastic addition on sticking of fine iron ore particles in fluidized bed reduction

Journal of iron and Steel Research International 2021年第2期28卷 140-151页

作者： Qi-yan Xu Zhang-han Gu Zhi-ping Li Ying-yi Zhang Hai-chuan Wang School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243002AnhuiChina

The adhesion of fine iron ore particles during fluidized bed reduction was studied using pressurized visible fluidized bed laboratory *** results showed that the optimal operating parameters for pure hydrogen reduction under high pressure were reduction temperature of 1073 K,particle size of 0.18-0.66 mm,pure H_(2) linear velocity of 0.8 m/s,reduction pressure of 200 kPa,and reduction time of 50 *** plastic particles were mixed into the fluidized bed,the optimal parameters were reduction temperature of 973 K,particle size of 0.18-0.66 mm,pure H_(2) linear velocity of 0.8 m/s,reduction pressure of 100 kPa,mass content of plastic particles of 8%,and reduction time of 65 *** chemical reaction resistance is much higher than the inner diffusion resistance at the initial stage of the reaction,whereas,in later stage,the inner diffusion resistance exceeds the chemical reaction *** contact area of iron atoms or iron whiskers gradually decreases with the increase in reduction pressure from 0.20 to 0.45 MPa,and the sticking trend gradually *** plastic particles in the fluidized reduction process of fine iron ore can effectively inhibit the adhesion among fine iron ore particles.

关键词： fine iron ore Fluidized bed Reduction pressure Plastic particle Sticking Reduction

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The process analysis of fine iron ore reduced in fluidized bed

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Baosteel Technical Research 2010年第S1期4卷 9-页

作者： FAN Jianfeng Research Institate,Baoshan iron & Steel Co.,Ltd.,Shanghai 201900,China

The processes of fine iron ore reduced in fluidized bed have been reviewed in this paper,the superiorities and limitations of the processes of direct reduction,pre-reduction in fluidized bed have also been comprehensively analysed,which matches with bath smelting furnace or coke bed type *** analysis has also been made on several controversial topics,and the gas use ratio has been point out to be the key of the competition of the reduction process in fluidized *** suitability with final reduction furnace is also important to the energy saving in the whole smelting reduction process.

关键词： fine iron ore fluidized bed direct reduction smelting reduction

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Experimental Study on Reduction Behavior of iron ore fines at Low Temperature

Experimental Study on Reduction Behavior of Iron Ore Fines a...

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第五届国际炼铁科技大会

作者： LI Qiu-ju YU Xiao WANG Dao-jing HONG Xin (Shanghai Key Laboratory of Modern Metallurgy & Materials Processing Shanghai University Shanghai 200072 China)

To optimize iron ore reduction processes, as well as to develop new ones, it is necessary to know the reduction kinetics of the iron ore of interest under the relevant operating conditions. In this work the reduction kinetics of hematite fine iron ore was studied for using the gas-conveyed technology at low temperatures. Experiments were performed in a laboratory-scale gas-conveyed reactor fluidized with H2- N2, CO-N2, H2-CO-N2 to simulate the relevant process conditions. The effects of gas solid flow ratio, temperature, gas composition and particle size on the degree of reduction were tested and discussed. The result showed that higher concentrations of H2 in the reducing gas gave higher rates of reduction due to good diffusion. The rate of formation of carbon and iron carbide increased especially in the presence of H2.

关键词： fine iron ore H2-CO mixture low temperature carbon deposition

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