Journal ArticleDOI
Role of hydrazine and hydrogen peroxide in aluminium hydroxide precipitation from sodium aluminate solution
N.K. Sahu,Chinmaya Kumar Sarangi,Barsha Dash,Bankim Chandra Tripathy,Bankim Chandra Tripathy,B.K. Satpathy,Danielle Meyrick,I.N. Bhattacharya,I.N. Bhattacharya +8 more
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Aluminium hydroxide precipitation from synthetic sodium aluminate solution was studied in the presence of hydrazine or hydrogen peroxide in this article, and it was shown that agglomerated products formed in presence of hydrine while fine discrete particles were produced with hydrogen peroxoxide.About:
This article is published in Transactions of Nonferrous Metals Society of China.The article was published on 2015-02-01. It has received 12 citations till now. The article focuses on the topics: Hydrogen peroxide & Sodium aluminate.read more
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Development of a hydrometallurgical process for the recovery of pure alumina from black dross and synthesis of magnesium spinel
TL;DR: In order to recover pure alumina and synthesize magnesium spinel from black dross, a hydrometallurgical process was developed in this article, which consisted of 1) NaOH leaching of the mechanically activated black residues, 2) removal of silicate(IV) from the leaching solution by adsorption followed by coagulation, 3) precipitation of aluminum hydroxide from the purified leaching solutions, 4) synthesis of magnesium spinels.
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Increasing precipitation rate from sodium aluminate solution by adding active seed and ammonia
TL;DR: In this paper, the fine active gibbsite seed with irregular edge, large specific area and high oil adsorption capacity was prepared by sodium bicarbonate solution and sodium aluminate.
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Dissolution kinetics and mechanism of gibbsitic bauxite and pure gibbsite in sodium hydroxide solution under atmospheric pressure
TL;DR: In this paper, the crystal structure, morphology, dissolution kinetics and mechanism of bauxite and pure gibbsite in NaOH solution under atmospheric pressure were systematically investigated by XRD and SEM.
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Effects of dry/wet ratio and pre-immersion on stress corrosion cracking of 7050-T7451 aluminum alloy under wet-dry cyclic conditions
TL;DR: In this paper, the effects of dry/wet ratio (DWR) and pre-immersion on stress corrosion cracking (SCC) behavior and mechanism of 7050 T7451 aluminum alloy under wet-dry cyclic conditions were investigated.
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Adsorptive removal of some Cl-VOC's as dangerous environmental pollutants using feather-like γ-Al2O3 derived from aluminium waste with life cycle analysis.
TL;DR: In this paper , a cost-effective preparation method of nanocomposite γ-Al2O3 derived from Al-waste was designed, which showed a characteristic efficiency towards the adsorptive removal of these compounds over a long period, i.e., eight continuous weeks, at ambient temperature and atmospheric pressure.
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Journal Article
Effect of Major Ions on Induction Time of Struvite Precipitation
TL;DR: In this article, the authors attempted to evaluate the induction time of struvite precipitation for low ammonia concentrations and in the presence of ions commonly found in natural waters, based on absorbance measurements while conductivity and pH of the solutions were also monitored during the process.
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Alumina trihydrate crystallization. Part 1. Secondary nucleation and growth rate kinetics
A. Halfon,Serge Kaliaguine +1 more
TL;DR: In this paper, the mass balance was used to determine nucleation and growth rate kinetics of alumina trihydroxide (hydrargillite) from caustic aluminate solutions of industrial composition.
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Gibbsite crystallization inhibition: 1. Effects of sodium gluconate on nucleation, agglomeration and growth
TL;DR: In this article, the effects of sodium gluconate, one of the strongest inhibitors of gibbsite crystallization from alkaline aluminate solutions, have been studied under the selected conditions.
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Improved precipitation of gibbsite from sodium aluminate solution by adding methanol
TL;DR: In this article, a new method is explored to improve the precipitation of gibbsite from sodium aluminate solution by adding methanol to the pregnant liquor, leading to faster crystallisation than the normal seeded precipitation process.
Patent
Use of polymers in alumina precipitation in the bayer process of bauxite beneficiation
TL;DR: In this article, the negative effects of sodium oxylate on the crystallization of aluminum trihydrate from Bayer process liquors were eliminated or curtailed by adding an effective amount of a polyacrylic acid with a molecular weight about 1,000,000 and containing at least 50 mole percent acrylic acid monomer to pregnant Bayer process liquid.