Reaction Behavior of Aluminogoethite and Silica Minerals in Gibbsite Bauxite in High-Temperature Digestion

Li, Lili; Wu, Zegang; Lv, Han; Liu, Fengqin; Zhao, Hongliang

doi:10.1007/s40831-022-00494-z

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…The source of the Fe 2+ can be different: iron [ 19 ] and aluminum [ 20 ] that reacts with the alkaline solution with the formation of H 2 and following the reduction of Fe 3+ to Fe 2+ ; the addition of FeSO 4 [ 21 , 22 ] and the addition of organic matter [ 23 ]. The presence of Fe 2+ ions also helps to decrease the amount of Na and Al that is lost with the BR, which is connected to the formation of other desilication products [ 24 ]. However, the main disadvantage of these methods is the need of a high-pressure leaching process at T > 220 °C.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Treatment of Boehmitic Bauxite Using the Bayer Reductive Method with the Formation of High-Iron Magnetite Concentrate

et al. 2023

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The Bayer process is the main method of alumina production worldwide. The use of low-quality bauxites for alumina production results in the formation of a significant amount of technogenic waste—bauxite residue (BR). The Bayer reductive method is one possible way to eliminate BR stockpiling, but it requires high-pressure leaching at temperatures higher than 220 °C. In this research, the possibility of boehmitic bauxite atmospheric pressure leaching at both the first and second stages or high-pressure leaching at the second stage with the simultaneous reduction of hematite to magnetite was investigated. Bauxite and solid residue after NaOH leaching were characterized using XRD, SEM-EDS, and Mössbauer spectroscopy methods. The first stage of leaching under atmospheric pressure with the addition of Fe(II) species in a strong alkali solution (330–400 g L–1 Na2O) resulted in a partial reduction of the iron minerals and an extraction of more than 60% of Si and 5–25% of Al (depending on caustic modulus of solution) after 1 h. The obtained desilicated bauxite was subjected to atmospheric leaching at 120 °C in a strong alkali solution (350 g L−1) or high-pressure leaching at 160–220 °C using the Bayer process mother liquor in order to obtain a concentrate with a magnetite content higher than 83 wt. %.

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Section: Introductionmentioning

confidence: 99%

Low-Temperature Treatment of Boehmitic Bauxite Using the Bayer Reductive Method with the Formation of High-Iron Magnetite Concentrate

et al. 2023

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show abstract

“…The source of the Fe 2+ can be different: iron [19] and aluminum [20] that reacts with the alkaline solution with the formation of H 2 and following the reduction of Fe 3+ to Fe 2+ ; the addition of FeSO 4 [21,22] and the addition of organic matter [23]. The presence of Fe 2+ ions also helps to decrease the amount of Na and Al that is lost with the BR, which is connected to the formation of other desilication products [24]. However, the main disadvantage of these methods is the need of a high-pressure leaching process at T > 220…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Treatment of Boehmitic Bauxite Using the Bayer Reductive Method With the Formation of High-Iron Mag-Netite Concentrate

Shoppert¹,

Valeev²,

Логинова³

et al. 2023

Preprint

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The Bayer process is the maim method of alumina production worldwide. The use of low-quality bauxites for alumina production results in the formation of a significant amount of technogenic waste - bauxite residue (BR). The Bayer reductive method is one possible way to eliminate BR stockpiling, but it requires high-pressure leaching at temperatures higher than 220 °C. In this research, the possibility of boehmitic bauxite atmospheric pressure leaching at both the first and second stages or high-pressure leaching at the second stage with the simultaneous reduction of hematite was investigated. Bauxite and solid residue after NaOH leaching were characterized using XRD, SEM-EDS, and Mössbauer spectroscopy methods. The first stage of leaching under atmospheric pressure with the addition of Fe(II) species in a strong alkali solution (330-400 g L–1 Na2O) results in a partial reduction of the iron minerals and an extraction of more than 60% of Si and 5-25% of Al (depending on caustic modulus of solution) after 1 h. The obtained desilicated bauxite was subjected to atmospheric leaching at 120 °C in a strong alkali solution (350 g L-1) or high-pressure leaching at 160-220 °C using the Bayer process mother liquor in order to obtain a concentrate with a magnetite content higher than 83 wt. %.

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Comparison of the effects of Ti- and Si-containing minerals on goethite transformation in the Bayer digestion of goethitic bauxite

Zhou,

Wang,

et al. 2023

Int J Miner Metall Mater

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Reaction Behavior of Aluminogoethite and Silica Minerals in Gibbsite Bauxite in High-Temperature Digestion

Cited by 6 publications

References 12 publications

Low-Temperature Treatment of Boehmitic Bauxite Using the Bayer Reductive Method with the Formation of High-Iron Magnetite Concentrate

Low-Temperature Treatment of Boehmitic Bauxite Using the Bayer Reductive Method with the Formation of High-Iron Magnetite Concentrate

Low-Temperature Treatment of Boehmitic Bauxite Using the Bayer Reductive Method With the Formation of High-Iron Mag-Netite Concentrate

Comparison of the effects of Ti- and Si-containing minerals on goethite transformation in the Bayer digestion of goethitic bauxite

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