Key Laboratory of Ecological and Recycle Metallurgy

Beijing, China

Key Laboratory of Ecological and Recycle Metallurgy

Beijing, China

Time filter

Source Type

Li H.,University of Science and Technology Beijing | Li H.,Key Laboratory of Ecological and Recycle Metallurgy | Guo L.,University of Science and Technology Beijing | Li Y.,University of Science and Technology Beijing | And 8 more authors.
Advanced Materials Research | Year: 2011

Some industrial trials of utilizing limestone as a new kind of slag-making agent instead of lime for slagging during LD-steelmaking process are discussed and analyzed in the present work. The results indicate that with oxygen blowing time being unchanged, slag forming rate increased significantly and final steel compositions and temperature reached the required standard during the steelmaking process with limestone used, compared with the process by using lime. The preliminary success achieved from industrial tests gave strong evidence that the idea of using limestone instead of lime for slagging is feasible and this new steelmaking method with limestone used, which saves energy and reduces CO2 emissions, can be successfully applied into industrial production. Thus, the application of this new method can not only sharply reduce energy consumption and emission of dust and CO2, but also bring significant environmental and economic benefits. © (2011) Trans Tech Publications, Switzerland.


Bai H.,University of Science and Technology Beijing | Bai H.,Key Laboratory of Ecological and Recycle Metallurgy | Liu P.,University of Science and Technology Beijing | Liu P.,Key Laboratory of Ecological and Recycle Metallurgy | And 6 more authors.
Advanced Materials Research | Year: 2011

As by-product of steeling making, steel slag accounts for 10% to 13% of steel production. Utilization of it as resource has been tried in many fields. For example, it can be used as building materials, most for paving and backfilling. However, utilization level of steel slag is still low, and to find a novel way to utilize steel slag efficiently is urgent. Steel slag includes much calcium and silicon, similar to those of clay, which means that it can be one of the raw materials for ceramic sintering. In this research, the process of steel-slag based ceramics sintering was developed. The ceramic tiles with excellent performance were obtained, with up to 36% steel slag added. By EPMA, the possible crystal phases that exist in the ceramic samples have been discussed. By XRD analysis, the main crystal phases of steel slag ceramics were identified, which are anorthite, a-quartz and magnetite. The clinoenstatite can be obtained through increasing the proportion of steel slag in the formula. The diopside can be obtained if the talc was added. These are key factors to obtain excellent performance ceramic tiles under low sintering temperature. © (2011) Trans Tech Publications.


Hou X.-M.,University of Science and Technology Beijing | Hou X.-M.,Key Laboratory of Ecological and Recycle Metallurgy | Hu X.-J.,University of Science and Technology Beijing | Hu X.-J.,Key Laboratory of Ecological and Recycle Metallurgy | And 2 more authors.
Journal of the American Ceramic Society | Year: 2011

The oxidation behavior of titanium nitride powder at different oxidizing atmospheres was investigated using thermogravimetric analysis, X-ray diffraction, and scanning electron microscopy. Oxidation experiments have been carried out both in isothermal as well as nonisothermal modes. The nonisothermal oxidation result showed that the oxidation rate was affected by temperature, heating rate, and oxygen partial pressure. The isothermal oxidation result showed that the diffusion of oxygen through the oxide product layer to the oxide/titanium nitride interface was the rate-controlling step and the oxidation product became obviously porous at elevated temperature. In view of the oxidation kinetics, Chou model, which quantitatively expresses the oxidation weight increment as a function of time, heating rate, temperature, and oxygen partial pressure, has been employed and gotten a good agreement. © 2010 The American Ceramic Society.


Hou X.-M.,University of Science and Technology Beijing | Hou X.-M.,Key Laboratory of Ecological and Recycle Metallurgy | Yue C.-S.,University of Science and Technology Beijing | Zhang M.,University of Science and Technology Beijing | Chou K.-C.,University of Science and Technology Beijing
International Journal of Minerals, Metallurgy and Materials | Year: 2011

The oxidation behavior of different SiAlON phases (β-SiAlON, X-phase SiAlON and 12H powders) synthesized from coal gangue in air atmosphere was investigated using isothermal thermogravimetry (TG) and field-emission scanning electron microscopy (FE-SEM). The effect of ferric oxide impurities in coal gangue was studied. The results show that ferric oxide contributes to the growth of SiAlON crystalline during the synthesis process. In the oxidation experiment, the existence of ferric oxide decreases the oxidation resistance of SiAlON. The reason is that the impurity causes the formation of a liquid phase at a higher temperature. At 1423-1623 K, the oxidation of SiAlON powders is diffusion controlled and it can be described by Chou's model. A fair agreement is found between theoretical calculations and the experimental data. © 2011 University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.


Zhang B.,University of Science and Technology Beijing | Zhang B.,Key Laboratory of Ecological and Recycle Metallurgy | Wang F.-M.,University of Science and Technology Beijing | Wang F.-M.,Key Laboratory of Ecological and Recycle Metallurgy | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2011

The orthogonal experiments of heat treatment were carried on 60Si2CrVAT spring steels with different Nb content and the mechanical properties were measured. Based on mechanical property analysis, the preferable heat treatment process were determined, which is austenized at 900°C for 35 min with oil cooling and tempered at 400°C for 60 min with water cooling. The influence of Nb content on the mechanical properties of the 60Si2CrVAT spring steel was investigated through analysis and comparison of the solid solubility of Nb and V in austenite, forged grain sizes and inclusions of the tested steels with different Nb content. The results show that the addition of 0.028% Nb in this steel can meet the mechanical property requirements and cost saving.


Guo L.,University of Science and Technology Beijing | Li H.,University of Science and Technology Beijing | Li H.,Key Laboratory of Ecological and Recycle Metallurgy | Li Z.,University of Science and Technology Beijing | And 3 more authors.
Advanced Materials Research | Year: 2011

Variations of decomposition rate and decomposition layer thickness of six spherical limestone particles with different sizes are calculated and compared with each other by the experiments and model of static decomposition of limestone under constant temperature. The results indicate that: the decomposition process of limestone can be explained by unreacted core model (UCM) when it is heated sharply; the decomposition rate of large particle is greater than that of small one; the smaller particle size, the larger decomposition layer thickness in unit time. © (2011) Trans Tech Publications, Switzerland.


Bai H.,University of Science and Technology Beijing | Bai H.,Key Laboratory of Ecological and Recycle Metallurgy | Liu P.,University of Science and Technology Beijing | Liu P.,Key Laboratory of Ecological and Recycle Metallurgy | And 6 more authors.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2010

A mathematical model of CO 2 emissions in iron and steel enterprises was established, and based on production data from a domestic steel plant, the amount of annual CO 2 emissions of the steel plant was calculated by using this model. The influences of the used energy types and the produced steel types on CO 2 emissions were discussed. Scenario analysis was conducted to analyze the effects of different ways and strategies on the reduction of CO 2 emissions, with four scenarios assumed: using natural gas instead of all the steam coal, using EAF processes to replace integrated steelmaking, considering feasible lowest process energy consumption (FLPEC) and applying waste heat recovery technology. The result shows that the using of waste heat recovery technology has little effect on CO 2 emissions, and only 3.39% of CO 2 emissions would be reduced; however, using EAF processes to replace integrated steelmaking has the most effective impact on the reduction of CO 2 emissions, it would reduce 45.07%, and even if indirect CO 2 emission, which is caused by EAF electricity consumption, is counted, the reduction of CO 2 emissions would still reach 24.30%.


Zhu J.,Key Laboratory of Ecological and Recycle Metallurgy | Zhu J.,University of Science and Technology Beijing | Xue J.,Key Laboratory of Ecological and Recycle Metallurgy | Xue J.,University of Science and Technology Beijing
TMS Annual Meeting | Year: 2011

Coal gangue is industrial waste containing Al 2O 3 and SiO 2 with great recycling and reuse values. This work is aimed at extracting Al 2O 3 content in the coal gangue by a process of carbonthermal reduction - alkaline leaching. The Al 2O 3 and SiO 2 contents first became a mixture of SiC and Al 2O 3 in the process of carbonthermal reduction, and then Al 2O 3 was separated by leaching in NaOH solution, thus producing the sodium aluminate solution for Al(OH) 3 precipitation. The products generated at various stages in the process were inspected using XRD and chemical analysis. The effects of parameters such as reduction temperature, carbon ratio, NaOH concentration, leaching time, leaching temperature, stirring speed, etc were investigated in details.

Loading Key Laboratory of Ecological and Recycle Metallurgy collaborators
Loading Key Laboratory of Ecological and Recycle Metallurgy collaborators