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国家自然科学基金(50804010)

作品数:4 被引量:38H指数:3
相关作者:胡宪伟高炳亮石忠宁王兆文陈功更多>>
相关机构:东北大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:环境科学与工程理学更多>>

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Electrochemical behavior of graphite anode during anode effect in cryolite molten salts被引量:2
2012年
Anodic electrochemical behavior was studied on graphite anode at 1000 ℃ in cryolite-alumina molten salt by means of cyclic voltammetry. The high current peak in a typical cyclic voltammogram was discussed. It is considered that a type of oxyfluoroaliminate complex anions reacts with carbon to form a high-resistance CF film on the anode surface at a high potential. The passivation potential is 3.28 V in 0.5% alumina-containing electrolyte, and the passivation potential increases with alumina content increasing which indicates that the alumina content determines the anodic process in the cryolite-alumina molten salt system.
陈功石忠宁高炳亮胡宪伟王兆文
关键词:PERFLUOROCARBONS
铝电解工业中全氟碳化物排放被引量:5
2010年
近年来,铝电解技术与设备取得很大进步,目前环保节能成为铝电解技术发展的主题。铝电解过程中发生阳极效应不但耗费电能,而且排放大量高温室潜势气体CF4、C2F6。面对这一现实,全球各电解铝企业都在不断做出努力,从1990年到2008年每吨铝的PFCs排放物减少量超过86%。本文主要概述了铝电解过程中PFCs的排放现状以及估算方法,并综述了近年来世界上关于CF4和C2F6产生机理的研究。
陈功石忠宁史冬高炳亮胡宪伟王兆文
关键词:阳极效应
Electrochemical behaviors of Mg^(2+) and B^(3+) deposition in fluoride molten salts被引量:3
2011年
By using cyclic and linear sweep voltammetry,the electrochemical deposition behaviors of Mg^2+ and B^3+ in fluorides molten salts of KF-MgF2 and KF-KBF4 at 880℃ were investigated,respectively.The results show that the electrochemical reduction of Mg^2+ is a one-step reaction as Mg^2++2e-→Mg in KF-1%MgF2 molten salt,and the electrochemical reduction of B^3+ is also a one-step reaction as B^3++3e-→B in KF-KBF4 (1%,2% KBF4) molten salts.Both the cathodic reduction reactions of Mg^2+ and B^3+ are controlled by diffusion process.The diffusion coefficients of Mg^2+ in KF-MgF2 molten salts and B^3+ in KF-KBF4 molten salts are 6.8×10^-7 cm^2/s and 7.85×10^-7 cm^2/s,respectively.Moreover,the electrochemical synthesis of MgB2 by co-deposition of Mg and B was carried out in the KF-MgF2-KBF4 (molar ratio of 6:1:2) molten salt at 750℃.The X-ray diffraction analysis indicates that MgB2 can be deposited on graphite cathode in the KF-MgF2-KBF4 molten salt at 750℃.
石忠宁李敏李兰兰高炳亮胡宪伟王兆文
关键词:ELECTRO-DEPOSITION
Recovery of carbon and cryolite from spent pot lining of aluminium reduction cells by chemical leaching被引量:28
2012年
A two-step alkaline-acidic leaching process was conducted to separate the cryolite from spent pot lining and to purify the carbon. The influencing factors of temperature, time, and the ratio of liquid to solid in alkaline and acidic leaching were investigated. The results show that the recovery of soluble compounds of Na3AlF6 and Al2O3 dissolving into the solution during the NaOH leaching is 65.0%,and the purity of carbon reaches 72.7%. During the next step of HCl leaching, the recovery of soluble compounds of CaF2 and NaAl11O17 dissolving into the HCl solution is 96.2%, and the carbon purity increases to 96.4%. By mixing the acidic leaching solution and the alkaline leaching solution, the cryolite precipitates under a suitable conditions of pH value 9 at 70 °C for 2 h. The cryolite precipitating rate is 95.6%, and the purity of Na3AlF6 obtained is 96.4%.
SHI Zhong-ningLI WeiHU Xian-weiREN Bi-junGAO Bing-liangWANG Zhao-wen
关键词:RECOVERY
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