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Effect of Al_(2)O_(3)/SiO_(2) mass ratio and CaO content on viscosity and structure of slag for pyrometallurgical processing of spent automotive catalysts

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Journal of Iron and Steel Research International 2024年第3期31卷 608-621页

作者： Zhe Wang Qi-long Wei cheng-bin Shi zhan-cheng guo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The effect of Al_(2)O_(3)/SiO_(2) mass ratio and CaO content on the viscosity and structure of the CaO-Al_(2)O_(3)-SiO_(2)-6MgO-1.5ZrO_(2)-1.5CeO_(2) slag was *** results show that with the increase in Al_(2)O_(3)/SiO_(2) mass ratio,the viscous flow units within the slag gradually change from Si-O-Si to Al-O-Al and ***,the substitution of Al_(2)O_(3) for SiO_(2) leads to the transformation of Si-O bonds towards weaker Al-O bonds,which weaken the bond strength of the aluminosilicate networks,thus leading to a decrease in the viscosity of *** increase in CaO content effectively promotes the depolymerization of the aluminosilicate networks,resulting in a significant decrease in the viscosity of the *** slag with Al_(2)O_(3)/SiO_(2) of 0.7-1.5 and CaO of 30 wt.%shows promise as the reference slag system for the Fe-collection smelting of spent automotive catalysts due to its good comprehensive performance.

关键词： Aluminosilicate slag Al_(2)O_(3)/SiO_(2)mass ratio CaO content Viscosity Slag structure

Rapid removal of copper impurity from bismuth-copper alloy melts via super-gravity separation

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International Journal of Minerals,Metallurgy and Materials 2021年第12期28卷 1929-1939页

作者： Xiao-chun Wen Lei guo Qi-peng Bao zhan-cheng guo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

A green method of super-gravity separation,which can enhance the filtration process of bismuth and copper phases,was investigated and discussed for the rapid removal of copper impurity from bismuth-copper alloy *** separation by the super-gravity field,the bismuth-rich liquid phases were mainly filtered from the alloy melt along the super-gravity direction,whereas most of the fine copper phases were retained in the opposite *** optimized conditions of separation temperature at 280℃,gravity coefficient at 450,and separation time at 200 s,the mass proportion of the separated bismuth from the Bi-2 wt%Cu and Bi-10 wt%Cu alloys respectively reached 96%and 85%,which indicated the minimal loss of bismuth in the ***,the removal ratio of impurity copper from the Bi-2 wt%Cu and Bi-10 wt%Cu alloys reached 88%and 98%,***,the separation process could be completed rapidly and is environmentally friendly and efficient.

关键词： alloy alloys separation

Phosphorus migration mechanism between iron and high phosphorus gangue phase at high temperatures

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Journal of Iron and Steel Research International 2019年第2期26卷 113-122页

作者： Lei guo Jin-tao Gao Sheng-ping Zhong zhan-cheng guo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The phosphorus migration mechanism during melting separation of non-carbon-reduced high phosphorus iron ore was ***,the equilibrium compositions of hydrogen-reduced high phosphorus iron ore at different temperatures were simulated by the use of equilibrium composition module of HSC Chemistry ***,thermodynamic calculation was verified by the real heat treatment of simulated hydrogen-reduced high phosphorus iron ore with several pure reagents including self-made pure *** iron particles in the simulated samples gathered and grew up during heat ***,the hypoeutectic structure of Fe-P with grid shape of high phosphorus phase and circular shape of low phosphorus phase emerged within those iron *** the penetration of phosphorus from the periphery into the iron particles,the grid structure became denser and *** proves that the elemenlal phosphorus can be reduced from the gangue phase by metallic iron without solid carbon at high temperatures.

关键词： Melting separation Fluorapatite Thermodynamics Phosphorus migration High phosphorus iron ore

NO_x reduction by coupling combustion with recycling flue gas in iron ore sintering process

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International Journal of Minerals,Metallurgy and Materials 2011年第4期18卷 390-396页

作者： Yan-guang Chen zhan-cheng guo Gen-sheng Feng School of Chemistry and Chemical Engineering No.beast Petroleum University Daqing 163318 China2 Key Laboratory of the Ministry of Education of China for Recycling ＆ Ecological Metallurgy University of Science and Technology Beijing Beijing 100083 China2

A new process called＇NOx reduction by coupling combustion with recycling flue gas（RCCRF）＇was proposed to decrease NOx emission during the iron ore sintering *** simulation test of NOx reduction was performed over sintered ore and in the process of coke ***,NOx reduction was also carried out by sintering pot *** sintered ore,the amount of NOx emission is reduced by 15wt%-25wt% at 400-550oC using 2.0vol% H2 or 2.0vol% CO,or reduced by 10wt%-30wt% at 560-720oC using 0.15vol% *** reduction is around 10wt% by coupling combustion of pyrolysis gas and coke,or around 16wt% by recycling flue gas into coke *** RCCRF,the maximum NOx reduction ratio is about 23wt% in coke combustion experiment and over 40wt% in sintering pot test.

关键词： nitrogen oxides combustion flue gases iron ores sintering

Effects of gravity on the electrodeposition and characterization of nickel foils

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International Journal of Minerals,Metallurgy and Materials 2011年第1期18卷 59-65页

作者： Ting Liu zhan-cheng guo Zhi Wang Ming-yong Wang State Key Lab of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of the Ministry of Education of China for Ecological and Recycle Metallurgy University of Science and Technology Beijing Beijing 100083 China

The effects of gravity on nickel electrodeposition,the morphology and mechanical properties of deposits were studied in a super gravity *** in a microgravity field were also presented based on the obtained experimental *** sweep voltammetry reveals that the nickel electrodeposition process is enhanced by increasing the gravity coefficient（G）.The limiting current density changes from 10.2 to 293.0 mA·cm-2 with the increase of the G value from 10-4 to *** morphology of deposits was analyzed by scanning electron microscopy（SEM） and atomic force microscopy（AFM）.The images show that the morphology deposited in the super gravity field has finer grain sizes and denser and smoother *** roughness reduces from 48.3 to 4.9 nm with the increase of the G value from 10-4 to ***,mechanical tests indicate that the mechanical properties of nickel foils are greatly improved due to introducing a super gravity field during electrodeposition.

关键词： metal foil nickel gravity microgravity electrodeposition mechanical properties

Oxide coating mechanism during fluidized bed reduction: solid-state reaction characteristics between iron ore particles and MgO

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International Journal of Minerals,Metallurgy and Materials 2016年第9期23卷 1019-1028页

作者： Lei guo Jin-tao Gao Yi-wei Zhong Han Gao zhan-cheng guo State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

Experiments on the solid-state reaction between iron ore particles and MgO were performed to investigate the coating mechanism of MgO on the iron ore particles＇ surface during fluidized bed reduction. MgO powders and iron ore particles were mixed and compressed into briquettes and, subsequently, roasted at different temperatures and for different time periods. A Mg-containing layer was observed on the outer edge of the iron ore particles when the roasting temperature was greater than 1173 K. The concentration of Fe in the Mg-containing layer was evenly distributed and was approximately 10wt%, regardless of the temperature change. Boundary layers of Mg and Fe were observed outside of the iron ore particles. The change in concentration of Fe in the boundary layers was simulated using a gas–solid diffusion model, and the diffusion coefficients of Fe and Mg in these layers at different temperatures were calculated. The diffusion activation energies of Fe and Mg in the boundary layers in these experiments were evaluated to be approximately 176 and 172 k J/mol, respectively.

关键词： fluidized beds coating solid reaction ferric oxide magnesia diffusion coefficient

Influence of hydrogen concentration on Fe_2O_3 particle reduction in fluidized beds under constant drag force

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International Journal of Minerals,Metallurgy and Materials 2015年第1期22卷 12-20页

作者： Lei guo Han Gao Jin-tao Yu Zong-liang zhang zhan-cheng guo State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

The fixed-gas drag force from a model calculation method that stabilizes the agitation capabilities of different gas ratios was used to explore the influence of temperature and hydrogen concentration on fluidizing duration, metallization ratio, utilization rate of reduction gas, and sticking behavior. Different hydrogen concentrations from 5vol%to 100vol%at 1073 and 1273 K were used while the drag force with the flow of N2 and H2 （N2：2 L·min^-1;H2：2 L·min^-1） at 1073 K was chosen as the standard drag force. The metallization ratio, mean reduc-tion rate, and utilization rate of reduction gas were observed to generally increase with increasing hydrogen concentration. Faster reduction rates and higher metallization ratios were obtained when the reduction temperature decreased from 1273 to 1073 K. A numerical relation among particle diameter, particle drag force, and fluidization state was plotted in a diagram by this model.

关键词： fluidized beds ferric oxide iron ores agglomeration hydrogen drag force

NO_x reduction in the sintering process

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International Journal of Minerals,Metallurgy and Materials 2009年第2期16卷 143-148页

作者： Yan-guang Chen zhan-cheng guo Zhi Wang Gen-sheng Feng State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy Sciences Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of the Ministry of Education of China for Recycling ＆ Ecologic Metallurgy University of Science and Technology Beijing Beijing 100083China

A new process, NOx reduction with recycling flue gas and modifying coke breeze, was proposed. The effects of modified coke breeze and recycled flue gas on NOx reduction were investigated by sinter pot tests. The results show that the NOx reduction rate is over 10wt% in the sintering of modified coke breeze, the effects of the additives on NOx reduction are： CeO2〉CaO〉K2CO3. The NOx reduction rate increases with the amount of recycled flue gas, and is 22.35wt% in the sintering with recycling 30vol% of the flue gas. When 30vol% of the flue gas is recycled into the sintering of CeO2, CaO, and K2CO3 modified coke breeze, the NOx reduction rates are 36.10wt%, 32.56wt%, and 32.17wt%, respectively.

关键词： nitrogen oxide flue gas coke breeze cerium oxide sintering

Removal of phosphorus-rich phase from high-phosphorous iron ore by melt separation at 1573 K in a super-gravity field

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International Journal of Minerals,Metallurgy and Materials 2016年第7期23卷 743-750页

作者： Jin-tao Gao Lei guo Yi-wei Zhong Hong-ru Ren zhan-cheng guo State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

A new approach of removing the phosphorus-rich phase from high-phosphorous iron ore by melt separation at 1573 K in a super-gravity field was investigated. The iron？slag separation by super-gravity resulted in phosphorus being effectively removed from the iron-rich phase and concentrated as a phosphorus-rich phase at a temperature below the melting point of iron. The samples obtained by super-gravity exhibited obvious layered structures. All the iron grains concentrated at the bottom of the sample along the super-gravity direction, whereas the molten slag concentrated in the upper part of the sample along the opposite direction. Meanwhile, fine apatite crystals collided and grew into larger crystals and concentrated at the slag–iron interface. Consequently, in the case of centrifugation with a gravity coefficient of G = 900, the mass fractions of the slag phase and iron-rich phase were similar to their respective theoretical values. The mass fraction of MFe in the iron-rich phase was as high as 97.77wt% and that of P was decreased to 0.092wt%.

关键词： ironmaking super-gravity melt separation dephosphoration