Mechanical Activation of Al-oxyhydroxide Minerals–A Review

Alex, T C; Kumar, Rakesh; Roy, Sunanda; Mehrotra, Shanta

doi:10.1080/08827508.2015.1055626

Cited by 41 publications

(9 citation statements)

References 92 publications

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“…This was accompanied by formation of meso-and possibly micro-pores. Alex 703 made similar observations for the transformation of boehmite (g-AlOOH) to bayerite. In a few studies, milling in an attrition mill is compared with milling in other milling devices.…”

Section: Role Of Water In Mechanochemistrymentioning

confidence: 66%

“…chalcopyrite, tetrahedrite, enargite, pentlandite, etc. ), 634,694 Al-oxyhydroxide minerals (gibbsite, boehmite), [701][702][703] alumina, 638,651,699,[704][705][706][707] calcium carbonate, 708 olivine, 636 kaolinite, 635 wollastonite, 645 coal, 709 pigments, 700 bauxite, 710-715a cement 715b and waste materials (slag, red mud). 647,716 Fritsch 704 and Oberacker et al 707 observed that while undergoing wet milling a change of phase composition from a-alumina to an aluminum tri-hydroxide phase can occur.…”

Section: Role Of Water In Mechanochemistrymentioning

confidence: 99%

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Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

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The aim of this review article on recent developments of mechanochemistry (nowadays established as a part of chemistry) is to provide a comprehensive overview of advances achieved in the field of atomistic processes, phase transformations, simple and multicomponent nanosystems and peculiarities of mechanochemical reactions. Industrial aspects with successful penetration into fields like materials engineering, heterogeneous catalysis and extractive metallurgy are also reviewed. The hallmarks of mechanochemistry include influencing reactivity of solids by the presence of solid-state defects, interphases and relaxation phenomena, enabling processes to take place under non-equilibrium conditions, creating a well-crystallized core of nanoparticles with disordered near-surface shell regions and performing simple dry time-convenient one-step syntheses. Underlying these hallmarks are technological consequences like preparing new nanomaterials with the desired properties or producing these materials in a reproducible way with high yield and under simple and easy operating conditions. The last but not least hallmark is enabling work under environmentally friendly and essentially waste-free conditions (822 references).

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Section: Role Of Water In Mechanochemistrymentioning

confidence: 66%

Section: Role Of Water In Mechanochemistrymentioning

confidence: 99%

Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

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“…It is also possible to apply the above alkaline recrystallization process at lower material/energy costs using an enlargement method [51] based on the difference in solubility of coarse particles of gibbsite or boehmite (AlOOH) and amorphous alumina (or highly dispersed hydroxide) [52,53]. Previous studies on the leaching of amorphous alumina in hot alkaline liquor have shown that, in this case, the process can occur at atmospheric pressure [54,55] and no high-pressure leaching equipment is necessary.…”

Section: Sga Production From Amorphous Aluminamentioning

confidence: 99%

Acid and Acid-Alkali Treatment Methods of Al-Chloride Solution Obtained by the Leaching of Coal Fly Ash to Produce Sandy Grade Alumina

Valeev

Shoppert

Михайлова

2020

Metals

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Sandy grade alumina is a valuable intermediate material that is mainly produced by the Bayer process and used for manufacturing primary metallic aluminum. Coal fly ash is generated in coal-fired power plants as a by-product of coal combustion that consists of submicron ash particles and is considered to be a potentially hazardous technogenic waste. The present paper demonstrates that the Al-chloride solution obtained by leaching coal fly ash can be further processed to obtain sandy grade alumina, which is essentially suitable for metallic aluminum production. The novel process developed in the present study involves the production of amorphous alumina via the calcination of aluminium chloride hexahydrate obtained by salting-out from acid Al-Cl liquor. Following this, alkaline treatment with further Al2O3 dissolution and recrystallization as Al(OH)3 particles is applied, and a final calcination step is employed to obtain sandy grade alumina with minimum impurities. The process does not require high-pressure equipment and reutilizes the alkaline liquor and gibbsite particles from the Bayer process, which allows the sandy grade alumina production costs to be to significantly reduced. The present article also discusses the main technological parameters of the acid treatment and the amounts of major impurities in the sandy grade alumina obtained by the different (acid and acid-alkali) methods.

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“…Preparation of LDHs by the solid-state reaction is worth investigating as an alternative to solution and slurry base methods. Mechanochemical synthesis, in which mechanical energy is used to induce the chemical reaction for the formation of material have been a topic of interest [125][126][127][128][129][130][131][132]. Mechanical forces such as compression, shear, and friction are used to induce the reaction by simply grinding the starting materials with mortar and pestle, or by using mill (ball mills and planetary mills).…”

Section: Mechanochemical Synthesesmentioning

confidence: 99%

Preparation of Layered Double Hydroxides toward Precisely Designed Hierarchical Organization

2019

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Layered double hydroxides (LDHs) are a class of materials with useful properties associated with their anion exchange abilities for a wide range of materials’ applications including adsorbent, catalyst and its support, ceramic precursor, and drug carrier. In order to satisfy the requirements for the detailed characterization and the practical application, the preparation of LDHs with varied composition and particle morphology has been examined extensively. The versatility of the preparation methods led LDHs with varied composition and micro/macroscopic morphology, which makes the application of LDHs more realistic. In the present review article, synthetic methods of LDHs are overviewed in order to highlight the present status of the LDHs for practical application.

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Mechanical Activation of Al-oxyhydroxide Minerals–A Review

Cited by 41 publications

References 92 publications

Hallmarks of mechanochemistry: from nanoparticles to technology

Hallmarks of mechanochemistry: from nanoparticles to technology

Acid and Acid-Alkali Treatment Methods of Al-Chloride Solution Obtained by the Leaching of Coal Fly Ash to Produce Sandy Grade Alumina

Preparation of Layered Double Hydroxides toward Precisely Designed Hierarchical Organization

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