INVESTIGATION OF SODIUM SULFATE ADDITIONS INTO CRYOLITE-ALUMINA MELTS

被引：0

作者：

Meirbekova, Rauan ^{[1
,2
]}

Haarberg, Geir Martin ^{[2
]}

Aarhaug, Thor A. ^{[3
]}

Saevarsdottir, Gudrun ^{[1
]}

机构：

[1] Reykjavik Univ, Sch Sci & Engn, IS-101 Reykjavik, Iceland

[2] NTNU, Dept Mat Sci & Engn, NO-7491 Trondheim, Norway

[3] SINTEF Mat & Chem, NO-7465 Trondheim, Norway

来源：

LIGHT METALS 2016 | 2016年

关键词：

sulfur; sodium sulfate; cryolite-alumina melt; aluminium electrolysis; PHASE-DIAGRAM;

D O I：

暂无

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In the Hall-Heroult process, sulfur impurities may not only emit harmful gases but also reduce current efficiency. To better understand this process, the behaviour of sulfur compounds in a cryolite-alumina melt at 1253 K (980 degrees C) was investigated in a laboratory cell. Sodium sulfate (Na2SO4) was added into the molten bath as a sulfur source. Furnace off-gases were passed through a mass spectrometer for qualitative assessment. The stability of sodium sulfate in the cryolite melt was found to depend on the presence of carbon (t(1/2) = 116 min) and carbon-aluminium (t(1/2) = 29 min). It changed dramatically during electrolysis (t(1/2) = 5-8 min). Detected sulfurous gases included SO2, COS, CS2, and H2S.

引用

页码：365 / 370

页数：6

共 30 条

[1]

Ambrova M., 2005, CHEM PAPERS SLOVAK A, V4, P235

[2] Determination of sulphur species in solidified cryolite melts [J].

Ambrova, Marta ;

Jurisova, Jana ;

Fellner, Pavel ;

Thonstad, Jomar .

CHEMICAL PAPERS, 2012, 66 (07) :621-625

[3]

Baimakov Yu. V., 1966, MOLTEN SALTS ELECTRO

[4]

Barillon E., 1977, LIGHT MET, P289

[5]

Bullough V.L., 1971, Light Metals, V1971, P411

[6] Albedo enhancement by stratospheric sulfur injections: A contribution to resolve a policy dilemma? [J].

Crutzen, Paul J. .

CLIMATIC CHANGE, 2006, 77 (3-4) :211-219

[7] Phase diagram of the system Na3AlF6-NaF-Na2SO4 [J].

Danielik, V ;

Gabová, J .

THERMOCHIMICA ACTA, 2001, 366 (01) :79-87

[8] Adsorption of SO2 on alumina [J].

Fellner, P. ;

Jurisova, J. ;

Khandl, V. ;

Sykorova, A. ;

Thonstad, J. .

CHEMICAL PAPERS, 2006, 60 (04) :311-314

[9]

FELLNER P, 1993, CHEM PAP, V47, P215

[10]

Gilmore GP., 1982, LIGHT MET, P741

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