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Phosphorus Removal of High Phosphorus Iron Ore by Gas-Based Reduction and Melt Separation

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Journal of Iron and Steel Research International 2010年第9期17卷 1-6页

作者： TANG Hui-qing guo zhan-cheng ZHAO Zhi-long Key Laboratory of Ecological and Recycle Metallurgy of Ministry of Education University of Science and Technology Beijing Beijing 100083 China

A new method （gas-based separation plus melt separation） has been proposed to remove phosphorus of the high phosphorus iron ore which was 1.25 % of phosphorus content and 50. 0% of iron content. HSC chemistry package and the coexistence theory of slag structure were adopted for theoretical analysis. The gas-based reduction was carried out using a fixed bed reactor and the ore sample of 80 g with an average particle size of 2 mm were reduced using CO or H2 at temperature of 1 073 K for 5 hours. 50 g of the reduced sample with 3.0% CaO as additive was then subjected to melt separation in an electric furnace at temperature of 1 873 K under Ar atmosphere. In each run, SEM, EDS, optical microscopic examination and chemical analysis of the reduced ore sample, the metal sample and the slag sample were conducted. Results of all gas-based reduction experiments showed that iron metallization ratios were some 65% and the phosphorus compounds in the ore remained unchanged. It was agreed well with the simula- tions except for the iron metallization rate being less than predicted value; this difference was attributed to kinetics. Results of melt separation experiments showed that P content in metal samples is 0.33% （metal sample from H2 reduction product） and 0.27% （metal sample from CO reduction product）. The phosphorus partition ratios of both cases were less than predicted values. Some P in the metal samples existed as slag inclusion was considered to be the reason for this discrepancy.

关键词： HSC chemistry package coexistence theory slag structure high phosphorus iron ore gas-based reduction melt separation

Effects of CaO on Precipitation Morphology of Metallic Iron in Reduction of Iron Oxides Under CO Atmosphere

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Journal of Iron and Steel Research International 2013年第7期20卷 16-24页

作者： ZHAO Zhi-long TANG Hui-qing guo zhan-cheng State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Iron and Raw Material Handling Division MCC Capital Engineering and Research Incorporation

Growth process of iron whiskers and mechanism of CaO influence on precipitation morphology of metallic iron at the gas-solid interfaces was studied. Analytical reagents of Fe（NO3）3 and Ca（NO3）2 aqueous solution were used to prepare sheet film sample of Fe2 O3-CAO by thermal decomposition at high temperature. In-situ observation was con-ducted using a stereo optical microscope and a hot-stage. And reduction kinetics of samples was studied by thermo gravimetrie （TG） method. Some samples after reduction were analyzed by using the scanning electron microscope （SEM）, energy dispersive spectrometer （EDS） and fourier transform infrared （FT-IR） spectrometer. Results indi-cate that during the reduction of iron oxides with CO, metallic iron is mostly precipitated as whisker and the precipi- tation behavior mainly depends on reduction rate. Doping CaO can significantly increase the reduction rate and effec-tively change the precipitation morphology of metallic iron after the reduction. When CaO doping concentration is less than 4% （mass percent）, CaO can promote whisker formation of reduced iron; as it reaches 6% （mass per- cent）, CaO inhibits iron whiskers growth; as it is more than 8% （mass percent）, no whiskers could be observed. Therefore, controlling the quantity of Ca^2＋ is effective to control the formation and growth of iron whiskers during gaseous reduction and thus eliminating ore grain sticking caused by intertexture of iron whiskers.

关键词： stereo optical microscopes in-situ observations gaseous direct reductions iron whiskers sticking

Reduction Behavior With CO Under Micro-Fluidized Bed Conditions

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Journal of Iron and Steel Research International 2013年第2期20卷 8-13页

作者： LIN Yin-he guo zhan-cheng TANG Hui-qing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

To process optimization and improve the degree of reduction, a two-step experiment was designed. The experiment was carried out in the micro-fluidized bed. The reactor in the micro-fluidized bed is operated as a differential reactor to ensure an equal temperature and residence time with the reactor volume. The experiment used Brazilian iron ore and reducing gas of CO. The operating temperature was 400 to 800 ℃ and the residence time was between 10 and 60 min. In correspondence with experiment, microscopic technique was applied too. The test shows that temperature and residence time of the pre-reduction stage have an important effect on the degree of reduction. By using two-step experiment, the maximum value of reduction degree increases by 44.1% compared with the maximum value of traditional reduction experiment. Microscopic analysis shows that the specific surface area, surface morphology and texture of reduced iron ore after pre-reduction stage have an important effect on the degree of final reduction too.

关键词： iron ore reduction two-step experiment specific suriace area morphology pre-reduction degree finalreduction degree

Development of New Co-gasification Technology Based on Blast Furnace

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Journal of Iron and Steel Research International 2005年第6期12卷 8-13页

作者： ZHAO Yue-hong WEN Hao guo zhan-cheng XU Zhi-hong Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China

A new co-gasification technology was proposed. The core of this co-gasification technology is a gasifier capable of being operated on a wide range of fuels and being reconstructed from blast furnace or shaft furnace. Based on this innovative concept, the lab-scale experiment and modeling study were carried out to demonstrate its technical validity and thermodynamic characteristics. The obtained results indicate that co-gasification process can be undertaken under ideal thermodynamic conditions where quasi-equilibrium could be reached without catalysts and Aspen Plus is a useful tool for this process development. Furthermore, potential applications of co-gasification were discussed.

关键词： blast furnace gasifier, DRI Aspen Plus co-gasification

Intensifying Gaseous Reduction of High Phosphorus Iron Ore Fines by Microwave Pretreatment

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Journal of Iron and Steel Research International 2013年第5期20卷 17-23页

作者： TANG Hui-qing WANG Jun-wei guo zhan-cheng OU Tie State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Research and Development Center Wuhan Iron and Steel Co.

Gaseous reduction kinetics of the high phosphorus iron ore fines from Hubei in China and effect of microwave pretreatment on the gaseous reduction behavior were studied. Gaseous reduction kinetics were investigated by TG （Thermogravimetric） methods using LINSEIS STA PT 1600 thermal analysis equipment. Microwave pretreatments to the ore fines with four power levels were performed using a high temperature microwave reactor. Its effect was examined by TG methods and its mechanism was analyzed by SEM （scanning electron microscope） and EDS （energy dispersive spectrometer）. Gaseous reduction tests were carried out using a tubular furnace. Results of kinetic study indicate that controlling step of the gaseous reduction of the ore fines is a mixing control of gas internal diffusion and interface chemical reaction when reduction fraction is less than 0.8 and is solid state diffusion when reduction fraction is more than 0.8. Microwave pretreatment of the ore fines could change the pore structure of the oolitic unit to generate cracks, fissures and loose zones, which promotes reduction in the early stage and delays the occurrence of sintering. Gaseous reduction tests show in the condition that the ore fines are pretreated with a microwave power of 450 W for 4 min and reduced under temperature of 1 273 K, the gaseous reduction of the ore fines could be apparently intensified. Using CO or H2 as a reductant and ore fines being reduced for 1.5 to 2 h , increase of metallization rate of the ore fines is 10% to 13%.

关键词： high phosphorus iron ore fine gaseous reduction kinetics microwave pretreatment

Conversion Excess Coal Gas to Dimethyl Ether in Steel Works

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Journal of Iron and Steel Research International 2002年第1期9卷 28-31页

作者： LI Jun-ling WEN Hao guo zhan-cheng XU Zhi-hong Institute of Chemical Metallurgy CAS

The centrifugal casting of compound HSS/nodular cast iron roll collar was studied, and the factors affecting transition zone quality were analyzed. The pouring temperature and interval in pouring are the main factors affecting transition zone quality. By controlling process parameter and flux adding during casting, high quality roll collar was obtained. The cause, why in the casting of HSS part, segregation appears easily, was analyzed and the countermeasure eliminating segregation was put forward, the measure eliminating heat treatment crackling was also put forward.

关键词： high speed steel nodular cast iron centrifugal compound casting combining layer roll collar

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

Morphology and Magnetic Properties of Electrodeposited Iron and Nickel Based Alloy Foils

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Journal of Iron and Steel Research International 2004年第6期11卷 45-51页

作者： guo zhan-cheng LIU Mei-feng SUN Chun-wen LIU Yu-xing LU Wei-chang Institute of Process Engineering CAS

An alternative to conventional process for the preparation of soft magnetic metal foils of Fe,Fe-Ni,Fe-Co and Fe-Ni-Co by electroforming was *** microstructure and magnetic properties were *** results showed that the crystal size of the iron-based alloy foil is less than 10μm,while that of nickel-based alloy foil is about 2μ***,the electroformed Fe-Ni foil has better magnetic properties than the conventional milled permalloy 1J79 foil.

关键词： electroforming Fe-Ni alloy foil magnetic property microstructure

Kinetics of Reduction Reaction in Micro-Fluidized Bed

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Journal of Iron and Steel Research International 2012年第6期19卷 6-8页

作者： LIN Yin-he guo zhan-cheng TANG Hui-qing REN Shan LI Jing-wei State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Micro-fluidized bed reactor is a new research method for the reduction of iron ore fines. The reactor is op- erated as a differential reactor to ensure a constant gas concentration and temperature within the reactor volume. In order to understand the dynamic process of the reduction reaction in micro-fluidized bed, a series of kinetic experi- ments were designed. In the micro fluidized bed, the use of shrinking core model describes the dynamic behavior of reduction of iron ore. And the apparent activation energy is calculated in the range of 700--850 ~C while the initial atmosphere is 100% content of CO.

关键词： iron ore reduction micro-fluidized bed dynamics