The effects of model organic compounds on gibbsite crystallization from alkaline aluminate solutions: polyols

Smith, P. G.; Watling, H.R.; Crew, Peter

doi:10.1016/0927-7757(95)03488-9

Cited by 39 publications

(24 citation statements)

References 5 publications

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“…9 (Angyal et al, 1974). Using NMR and Raman spectroscopy, Smith et al (1996) confirmed that complexes also exist between the alditols and aluminium in aqueous solution at pH 14. Furthermore, the degree of complexation was found to be qualitatively in the same order as previously reported for (acidic) acetate solutions for the limited number of compounds studied.…”

Section: Aliphatic Poly-hydroxy Compounds-the Alditolsmentioning

confidence: 57%

“…Smith et al (1996) found that alditols generally inhibit gibbsite crystallization, and that the degree of inhibition generally increases with carbon chain length. Diols are generally less effective inhibitors, and it was found that compounds with three adjacent hydroxyl groups tended to be the strongest inhibitors.…”

Section: Aliphatic Poly-hydroxy Compounds-the Alditolsmentioning

confidence: 98%

“…These considerations suggest that it may be the aluminium- Table 2 The first nine alditols, with stereo-isomers bracketed. The chiral centres are labelled as circles (data from Smith et al (1996)). R 2 = 0.96 Fig.…”

Section: Aliphatic Poly-hydroxy Compounds-the Alditolsmentioning

confidence: 99%

“…Data fromSmith et al (1996) andAngyal et al (1974). Schematic representation of an aluminium-alditol complex attached to a growth site.…”

mentioning

confidence: 97%

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Organic compounds in the processing of lateritic bauxites to alumina Part 2: Effects of organics in the Bayer process

Power¹,

Loh

Vernon

2012

Hydrometallurgy

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Section: Aliphatic Poly-hydroxy Compounds-the Alditolsmentioning

confidence: 57%

Section: Aliphatic Poly-hydroxy Compounds-the Alditolsmentioning

confidence: 98%

Section: Aliphatic Poly-hydroxy Compounds-the Alditolsmentioning

confidence: 99%

“…Data fromSmith et al (1996) andAngyal et al (1974). Schematic representation of an aluminium-alditol complex attached to a growth site.…”

mentioning

confidence: 97%

See 2 more Smart Citations

Organic compounds in the processing of lateritic bauxites to alumina Part 2: Effects of organics in the Bayer process

Power¹,

Loh

Vernon

2012

Hydrometallurgy

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“…Crystallization inhibitors such as acyclic polyols are often reported [1][2][3][4]. The studies on these model compounds brought to light the important role of vicinal hydroxyl groups in the inhibiting behaviour of polyols in gibbsite precipitation.…”

Section: Introductionmentioning

confidence: 99%

Selective electrochemical reactions of an alumina hydrate crystallization inhibitor

Bouchard¹,

Brisach-Wittmeyer

Breault³

et al. 2007

J Appl Electrochem

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Selective reactions of catechol have been studied in regard to its inhibition properties towards alumina hydrate crystallization. Electrochemical reactions of the inhibitor leading to products without inhibition behaviour have been obtained using different conditions. First, a pure sodium hydroxide solution (1.0 M NaOH) was used to electrochemically react the catechol. The inhibitor reactions were then carried out in both saturated and supersaturated sodium aluminate solutions (NaAl(OH) 4 ). Electrocatalytic hydrogenation (ECH) of the aromatic ring over rhodium-based catalysts leads to the saturated non-inhibiting molecule, 1,2-cyclohexanediol. Temperature shows no significant influence on the ECH process within the temperature range where the alumina hydrate crystallization is normally carried out. The presence of aluminate ions in solution has, however, a detrimental effect on the current efficiency. Electro-oxidation of the catechol produces muconic acid by cleavage of the carbon-carbon bound. It also produces other oxidation products and, eventually, may lead to total mineralization of catechol into carbonate, which is a less inhibiting molecule. A detrimental effect of the presence of aluminate on the electro-oxidation is also observed. Electrochemical techniques are proposed as new pathways for organic control in caustic medium.

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A review of the determination of organic compounds in Bayer process liquors

Power

Loh

Wajon³

et al. 2011

Analytica Chimica Acta

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Bayer process liquors present a difficult and complex matrix to the analytical chemist, and the history of the application of modern analytical techniques to this problem is a case study in innovation. All Bayer process liquors contain organic compounds, in amounts varying from traces to several grams per litre. The total organic carbon content of Bayer liquors may be less than 5 g/L up to as much as 40 g/L. The presence of these organic impurities is of concern to Bayer technologists because they can have significant impacts on the economics of the process and the quality of the product. This review examines the history and current state-of-the-art of the analysis of organics in Bayer process liquors, and provides guidance on the applicable techniques matched to a comprehensive list of the compounds most likely to be present.

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The effects of model organic compounds on gibbsite crystallization from alkaline aluminate solutions: polyols

Cited by 39 publications

References 5 publications

Organic compounds in the processing of lateritic bauxites to alumina Part 2: Effects of organics in the Bayer process

Organic compounds in the processing of lateritic bauxites to alumina Part 2: Effects of organics in the Bayer process

Selective electrochemical reactions of an alumina hydrate crystallization inhibitor

A review of the determination of organic compounds in Bayer process liquors

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