WANG Wenmei Baotou Research Institute of Rare Earth
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Ministry of Metallurgy Industry
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Baotou
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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
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null
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null
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null
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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
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WANG Jixin Baotou Research Institute of Rare Earth
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Ministry of Metallurgical Industry
,
Baotou
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China Senior Engineer
,
Baotou Research Institute of Rare Earth
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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
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null
REN Jun Baotou Research Institute of Rare Earth Metals
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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
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null
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null
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LI Bei WU Shuangxia MENG Guang'en JIANG Liping PANG Wenjie Baotou Research Institute of Rare Earth
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Baotou
,
China Baotou Research Institute of Rare Earth
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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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