Effect of Lime on Digestion of Gibbsitic Bauxites at Low Temperature

doi:-

Abstract

Abstract: The effects and function mechanism of the different amount of lime additions on the digestion properties of three kinds of gibbsitic bauxites obtained from abroad were investigated at 145℃. All the gibbsitic bauxites are comprised of gibbsite， aluminogoethite， hematite， kaolin， quartz as well as minor anatase and boehmite characterized by XRD. The results showed that the lime addition promoted the desilication reactions， which decreased the concentrations of alumina and silica of digested sodium aluminate liquor. The corresponding silica index increased gradually and the alumina digestion rates of gibbsitic bauxites decreased linearly with the increase of the mass fraction of the lime. The conversion of desilication products from sodium silicon aluminum hydrate to hydrogarnet was also promoted by the addition of lime. The concentration of caustic alkali increased and the mass fraction of the alkali in the red mud decreased gradually with the increase of the mass fraction of the lime.

Key words: gibbsite, sodium aluminate liquor, digestion, desilication, lime

CLC Number:

TF821

PAN Xiaolin， YU Haiyan， TU Ganfeng， BI Shiwen. Effect of Lime on Digestion of Gibbsitic Bauxites at Low Temperature[J]. Journal of Northeastern University, 2013, 34(4): 551-555.

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