WANG Wenmei Baotou Research Institute of Rare Earth
,
Ministry of Metallurgy Industry
,
Baotou
,
ChinaYU Yongfu CHEN Quanyuan Changsha Institute of Mining and Metallurgy
,
Ministry of Metallurgy Industry
,
Changsha
,
China engineer
,
Baotou Research Institute of Rare Earth
,
Ministry of Metallurgical Industry
,
Baotou 014010
,
China
金属学报(英文版)
Based on theoretical calculation of electronegativity of groups of flotation reagent and method of infrared adsorption spectroscopy,the collection and adsorption of α-nitroso-β- naphthol in hematite flotation have been studied.The chemical adsorption seems to be predominant owing to formation of pentacyclic nitrosyl chelate compound by atoms of nitrosyl bond in α-nitroso-β-naphthol together with Fe(Ⅲ)on hematite surface.Mean- while,the nonuniform multilayer physical adsorption is also occurred.
关键词:
α-nitroso-β-naphthol
,
null
,
null
,
null
,
null
LI Bei WU Shuangxia LI Dianchen Baotou Research Institute of Rare Earth Ministry of Metallurgical Industry
,
Baotou
,
ChinaMA Ruzhang University Science and Technology Beijing
,
Beijing
,
China Baotou Research Institute of Rare Earth
,
Ministry of Metallurgical Industry
,
Baotou 014010
,
China
金属学报(英文版)
A high temperature embrittlement occures in Fe-15Cr-4AI and Fe-20Cr-4Al alloys treated over 1000 C.It is caused mainly by 475℃ brittleness during cooling.When a secondary treatment at 500℃ was conducted,the 475℃ brittleness developed very rapidly.After only 15 rain of the treating,little plasticity was remained for all samples pretreuted at the temper- atures over 1000℃ and cooled in water.However,no 475℃ brittleness was generated when pretreating temperature was below 1000℃,Addition of Yttrium can inhibit not only grain growth,but also 475℃ brittleness.For the alloys with 0.2—0.4 wt-%Y,after treating at 800—1300℃,the plasticity did not decrease and the properties of furnace cooled samples were not lower than those of water cooled samples.
关键词:
Fe-Cr-Al alloy
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null
,
null
WANG Jixin Baotou Research Institute of Rare Earth
,
Ministry of Metallurgical Industry
,
Baotou
,
China Senior Engineer
,
Baotou Research Institute of Rare Earth
,
P.O.Box 131
,
Baotou 014010
,
China
金属学报(英文版)
In the light of estimation model for ternary excess properties,an approximate analytical procedure for ternary Gibbs-Duhem equation was proposed,and verification by previous ternary systems as Cd-Bi-Pb and Zn-In-Cd was also made.
关键词:
Gibbs-Duhem equation
,
null
REN Jun Baotou Research Institute of Rare Earth Metals
,
Ministry of Metallurgical Industry
,
Baotou
,
China engineer
,
Baotou Research Institute of Rare Earth Metals
,
Baotou 014010
,
China
金属学报(英文版)
The flotation behaviour and mechanism of bastnaesite with N-hydroxyl phthalicimide were investigated by ξ-potential measurement,infrared spectrum and quantum chemistry calculation.The results show that 3 oxygen atoms from N-hydroxyl phthalicirnide chelate the rare earth ions on the surface of bastnaesite to form double five-chain O=C-N-O- RE(Ⅲ)-O chelate which is chemically adsorbed on the surface of bastnasite,thus making N-hydroxyl phthalicimide an effective collector for bastnaesite.
关键词:
N-hydroxyl phthalicimide
,
null
,
null
,
null
LI Bei WU Shuangxia MENG Guang'en JIANG Liping PANG Wenjie Baotou Research Institute of Rare Earth
,
Baotou
,
China Baotou Research Institute of Rare Earth
,
P.O.Box 131
,
Baotou 014010
,
China
金属学报(英文版)
With the increase of Y content in the Fe-20Cr-4AI-Y alloy,the uniform deformability of tensile specimens was found to be slightly decreased,as well as,the fracture strength and re- duction after necking remarkably dropped.This seems to be dependent upon the brittle phase containing Y.The behaviour of Y-containing phase may be improved by adjusting the metallurgical technological process.
关键词:
Fe-Cr-A1 alloy
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null
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null
SHI Lin
,
LI Zhi-ling
,
YU Tao
,
LI Jiang-peng
钢铁研究学报(英文版)
In blast furnace (BF) iron-making process, the hot metal silicon content was usually used to measure the quality of hot metal and to reflect the thermal state of BF. Principal component analysis (PCA) and partial least-square (PLS) regression methods were used to predict the hot metal silicon content. Under the conditions of BF relatively stable situation, PCA and PLS regression models of hot metal silicon content utilizing data from Baotou Steel No6 BF were established, which provided the accuracy of 884% and 892%. PLS model used less variables and time than principal component analysis model, and it was simple to calculate. It is shown that the model gives good results and is helpful for practical production.
关键词:
hot metal silicon content
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partial least square
,
principal component analysis
,
temperature prediction
WANG Yi-ci
,
ZHANG Jian-liang
,
ZHANG Fang
,
LUO Guo-ping
钢铁研究学报(英文版)
Influence of sintering temperature, basicity and MgO content on the formation characteristics of calcium ferrite in low silicon sinter of Baotou Iron and Steel Company was studied by means of mini-sintering test and mineralographic microscope analysis. In addition, the suitable sintering parameters such as temperature and basicity were explored. The results found that optimum temperature for the formation of calcium ferrite is 1280 ℃, the basicity of 25-28 is helpful to the development of acicular or columnar calcium ferrite, and MgO content in the low silicon sintering raw materials should be lower than 28% because MgO can intensively inhibit the formation of calcium ferrite. And calcium ferrite in the sinter belongs to calcium ferrite with low calcium, which is different from that in ordinary sinter at home and abroad. So, it provided theoretical basis for promoting formation of calcium ferrite in low silicon sinter and improving properties of sinter.
关键词:
low silicon sinter
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formation characteristics
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calcium ferrite
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sintering temperature
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basicity
ZHANG Fang
,
AN Sheng-li
,
LUO Guo-ping
,
WANG Yi-ci
钢铁研究学报(英文版)
Abstract： Baivumebo iron ore is special magnetite containing fluorine, kalium and sodium elements, and the main raw material for ironmaking of Baotou Iron and Steel (Group) Co. The effects of basicity and ratio of Al2O3 to SiO2 (A/S) on the formation of silico-ferrite of calcium and aluminium (SFCA) in Baivumebo low silica sinters were studied by means of mini-sintering, XPF-500 optical mineralogical microscope and CSS-88000 electronic universal testing machine. The results show that it is beneficial to the formation of complex calcium ferrite to enhance the basicity of Baivumebo low silica sinters. The acicular SFCA-I was increased with the enhancing basicity and reached the peak at basicity 28, then the columnar or platy SFCA formed and the bonding strength decreased. Alumina is beneficial to the formation of acicular complex calcium ferrite in Baivumebo low silica sinters. But the residual unfused Al2O3 reagent came into being when A/S was 035, while complex calcium ferrite still remained to be acicular. There is a common rule about mineralogy components affected by basicity and ratio of A/S, that is, SFCA is increasing accompanied with hematite and porosity reduced, but the content of glass phase is stable.
关键词:
Key words: Baivumebo iron concentrates
,
Baivumebo low silica sinter
,
SFCA
,
basicity
,
alumina-silica ratio
