赤泥中钠铁酸法浸出的工艺条件和机理探讨

Abstract

Abstract: The extraction rates of sodium and iron from red mud of Bayer process by H₂SO₄，CH₃COOH，and H₂C₂O₄ were mainly discussed and analyzed comparatively.The results showed effect of H₂SO₄ on extraction rates of Na and Fe was dramatic. Na extraction rate was raised by increasing H₂SO₄ concentration and was 99.99% under the conditions of 20 ℃，1.8 mol/L H₂SO₄，and 30 min reaction time.Fe extraction rate，increase of which was induced by H₂SO₄ concentration and temperature， was 67.93 % at 2.8 mol/L H₂SO₄，50 ℃，and 45 min reaction time.The kinetics processes of Na and Fe extraction by H₂SO₄ followed the internal diffusion?鄄controlled mode and the apparent activation energy of Fe extraction was determined to be 37.50 kJ/mol.Crystalline minerals after Na extraction were mainly CaSO₄·2H₂O，Fe₂O₃，Al（OH）₃，and TiO₂.Crystalline minerals after Fe extraction were CaSO₄·2H₂O and TiO₂.

Key words: red mud, sulphuric acid, kinetics mechanism, change of mineral components

CLC Number:

CHEN Hong-Liang, WANG Ting, KE Yang, WANG Sheng-Bi. Technology conditions and mechanism discussion of sodium and iron extraction from red mud by acid[J]. INORGANICCHEMICALSINDUSTRY, 2016, 48(1): 44-.

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Inorganic Acid-Base-Salt Committee of CIESC

Technology conditions and mechanism discussion of sodium and iron extraction from red mud by acid

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