LI Cheng Beijing Central Design and Research Institute for Non-Ferrous Metallurgical Industry
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Beijing
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ChinaLIU Chunpeng
,
Kunming Institute of Technology
,
Kunming
,
China LI Cheng
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Metallurgical Dept.No.l
,
Beijing Central Design and Research Institute for Non-Ferrous Metallurgical Industry
,
Beijing 100038
,
China
金属学报(英文版)
The rate equation of reaction between PbS and PbO is dα/dt=kx_(PbS)~3 x_(PbO)~(-2).A transition product, PbSO_4·2PbO,is found by X-ray diffraction analysis.The reaction mechanism was dis- cussed on the basis of electron transfer.
关键词:
kinetics
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null
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null
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null
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null
In-Sung Cho
,
Seung-Mok Yoo
,
Chae-Ho Lim
,
Jeong-Kil Choi
材料科学技术（英文）
Construction of integrated database including casting shapes with their casting design, technical knowledge, and thermophysical properties of the casting alloys were introduced in the present study. Recognition technique for casting design by industrial computer tomography was used for the construction of shape database. Technical knowledge of the casting processes such as ferrous and non-ferrous alloys and their manufacturing process of the castings were accumulated and the search engine for the knowledge was developed. Database of thermophysical properties of the casting alloys were obtained via the experimental study, and the properties were used for the in-house computer simulation of casting process. The databases were linked with intelligent casting expert system developed in center for e-design, KITECH. It is expected that the databases can help non casting experts to devise the casting and its process. Various examples of the application by using the databases were shown in the present study.
关键词:
Integrated database
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null
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null
Zheng FANG
,
Quanru ZHANG
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Hengzhong ZHANG
,
Yuan FANG
材料科学技术（英文）
The thermoelectrochemistry (TEC), a novel cross discipline, is presented, including the basic equations for a cell and a half-cell reaction, the treatment of experimental data and its application to electro-generative leaching of mineral and to measuring thermodynamic and kinetic data of an electrode reaction. The TEC technology will play an important part in the research on the metallurgical process under various fields.
关键词:
LIU Chengjun
,
SHI Peiyang
,
ZHANG Dayong
,
JIANG Maofa
钢铁研究学报(英文版)
A great amount of ferrous tailings and slag cause severe damage to the ecological environment, which must be reclaimed and utilized. The composition, type, and characteristics of ferrous tailings and slag in China were introduced. The research status and the application outlook of glass ceramics made from ferrous tailings and slag were discussed. Glass ceramics made from ferrous tailings and slag can be applied to various fields, and it will be environmentally conscious materials in the 21st century.
关键词:
glass ceramics;ferrous tailings;slag
ZHANG Xiumu LI Yiyi Institute of Metal Research
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Academia Sinica
,
Shenyang 110015
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China
金属学报(英文版)
In situ observations of the nucleation and growth of ferrous martensites,including ε-, lenticular,butterfly,thin-plate and composite-plate ones at low temperature stage on optical or transmission electron microscope were carried out.The results confirmed the faulting model for the formation of ε-martensite proposed by Olso and Cohen.The grain boundaries and tri- ple points are the favourable nucleation sites for the thin plates,and their surface relief grown initially like a small needle.The lenticular martensite was observed as two stages of formation.According to the dislocation resolving reaction. (a/6)[111]_b→(a/3)[]_b+(a/2)[111]_b,the emission dislocation(=(a/2)[111]_b)acting as the dislocation source for the transition of lattice invariant shear from twinning to slip was proposed.
关键词:
martensite
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null
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null
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null
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null
HU Chang-qing
,
HAN Tao
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ZHANG Yu-zhu
,
ZHANG Zhi-xia
钢铁研究学报(英文版)
For the recycling of ferrous sludge from steel industry, the carbonation pellet process should be considered as a “green” process, since no impurities are added as well as CO2 can be sequestrated and consumed. Through the thermodynamic calculation, the carbonation reaction can occur spontaneously and is an exothermic reaction. Based on the kinetic analysis through unreacted core model, the interfacial chemical reaction was the rate controlling step in the initial fast stage of carbonation, and the CO2 diffusion through the CaCO3 product layer was the rate controlling step in the following extremely slow stage. For the carbonation bonded mechanism, the pellet strength was gained by the formation and growing of CaCO3 product layer. Since the interfacial chemical reaction was the critical stage of the entire carbonation process, the emphasizes should be focused on the improvement of sorbent activity and the optimization of process parameters, such as pore structure, pore surface area, and total pressure, CO2 partial pressure, reaction temperature, etc to accelerate the reaction rate and to improve the quality of carbonation pellets.
关键词:
CO2 sequestration
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ferrous sludge
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carbonation pellet
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thermodynamics
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kinetics
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unreacted core model
