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Sulfur phase and sulfur removal in high sulfur-containing bauxite 被引量:15
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作者 胡小莲 陈文汨 谢巧玲 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第7期1641-1647,共7页
The sulfur phase in high sulfur-containing bauxite was studied by an X-ray diffraction analysis and a chemistry quantitative analysis.The methods for the removal of different shaped sulfur were also discussed.The resu... The sulfur phase in high sulfur-containing bauxite was studied by an X-ray diffraction analysis and a chemistry quantitative analysis.The methods for the removal of different shaped sulfur were also discussed.The results show that sulfur phases in high sulfur-containing bauxites exist in the main form of sulfide sulfur (pyrite) or sulfate sulfur,and the main sulfur forms of bauxites from different regions are not the same.Through a combination of an X-ray diffraction analysis and a chemistry quantitative analysis,the sulfur phases of high sulfur-containing bauxite could be accurately investigated.Deciding the main sulfur form of high sulfur-containing bauxite could provide theoretical instruction for choosing methods for the removal of sulfur from bauxite,and an oxidizing-roasting process is an effective way to remove sulfide sulfur from high sulfur-containing bauxite,the content of S^2-in crude ore in the digestion liquor is above 1.7 g/L,but in the roasted ore digestion liquor,it is below 0.18 g/L.Using the sodium carbonate solution washing technology to wash bauxite can effectively remove sulfate sulfur,the content of the total sulfur in ore is lowered to below 0.2% and can meet the production requirements for the sulfur content. 展开更多
关键词 high sulfur-containing bauxite sulfur phase oxidizing-roasting sodium carbonate solution washing technology
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Preliminary study on washability and composition analysis of high- sulfur coal in some mining areas in Guizhou
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作者 QIU Yue-qin MAO Song +2 位作者 ZHANG Qin TIAN Ye LIU Zhi-hong 《Journal of Coal Science & Engineering(China)》 2011年第1期93-95,共3页
Preliminary sink-float experiments on high-sulfur coal was done in some mining areas and carried on elementary analysis, industrial analysis, and ashcontent analysis. Through the experiments, definite middlings, and g... Preliminary sink-float experiments on high-sulfur coal was done in some mining areas and carried on elementary analysis, industrial analysis, and ashcontent analysis. Through the experiments, definite middlings, and gangue, the phase analysis of sulfur was carried on, by which a good understanding of sulfur characters in raw coal was achieved. 展开更多
关键词 High-sulfur coal sink-float experiments composition analysis sulfur phase analysis
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STUDIES ON THE REACTION OF SULFUR,SELENIUM AND TELLURIUM WITH SODIUM HYDROXIDE UNDER PHASE TRANSFER CATALYSIS(Ⅱ).A CONVENIENT METHOD FOR THE SYNTHESIS OF BI(ACYL)DISULFIDES
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作者 Jin-Xian WANG(Chin-Hsien WANG) Wenfeng CUI Yulai HU Kai ZHAO Institute of Chemistry,Department of Chemistry,Northwest Normal University,Lanzhou,730070 《Chinese Chemical Letters》 SCIE CAS CSCD 1990年第3期193-196,共4页
A simple and general method for the synthesis of bi(acyl)disulfides is reported.Sulfur is allowed to react with sodium hydroxide to give sodium disulfide at 65℃ under PTC,which can react with acyl halides to afford b... A simple and general method for the synthesis of bi(acyl)disulfides is reported.Sulfur is allowed to react with sodium hydroxide to give sodium disulfide at 65℃ under PTC,which can react with acyl halides to afford bi(acyl)disulfides in good to excellent isolated yields.The effects of solvents and phase transfer catalysts are discussed. 展开更多
关键词 In Wang ACYL)DISULFIDES STUDIES ON THE REACTION OF SULFUR SELENIUM AND TELLURIUM WITH SODIUM HYDROXIDE UNDER PHASE TRANSFER CATALYSIS A CONVENIENT METHOD FOR THE SYNTHESIS OF BI PEG OC Ph
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Synergetic migration behavior of La and Ce and related microstructure character of Cr-V-RE co-doped WC-Co alloy 被引量:4
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作者 张立 唐炜 +2 位作者 陈述 南晴 解明伟 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第5期480-485,共6页
The as-sintered sinter skin and the polished section of WC-11Co-0.4Cr 3 C 2-0.3VC-0.2RE(RE=mischmetal with La/Ce ratio of 0.65) alloy were analyzed.It was shown that the microstructures on the skin and in the inner ... The as-sintered sinter skin and the polished section of WC-11Co-0.4Cr 3 C 2-0.3VC-0.2RE(RE=mischmetal with La/Ce ratio of 0.65) alloy were analyzed.It was shown that the microstructures on the skin and in the inner part of the alloy were all characterized with a WC+β+M structure,where β was a cobalt-based binder phase and M represented a RE-containing phase.There existed an inward diffusion of S atoms,which caught and fixed the Ce atoms in the alloy and an outward diffusion of La atoms during the sintering process.Consequently,the M phase was characterized with the decreased La/Ce ratio(0.59) in the inner part and the increased La/Ce ratio(1.01) on the skin.The M phase on the skin was characterized with a γ-Ce 2 S 3 type structure.To suppress the long range migration of rare earth to the skin,S in the sintering atmosphere had to be eliminated. 展开更多
关键词 cemented carbide sintering rare earth diffusion La and Ce synergetic migration Ln 2 S 3 dispersed phase sulfur
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