Thermolysis of acidic aluminum chloride solution and its products

Иванов, В. В.; Кирик, С. Д.; Шубин, А. А.; Blokhina, I. A.; Денисов, В. М.; Irtugo, L. A.

doi:10.1016/j.ceramint.2012.10.226

Cited by 9 publications

(6 citation statements)

References 10 publications

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“…and second, the aluminum oxychloride decomposes into Al2O3 at higher temperatures. However, if the heating rate is high enough, reactions (3) and (4) occur almost simultaneously (see, for example, [42]), and this results in one broad peak from 100 to 300 °C, as can be seen in Figure 7. In the present study, it was found that in order to maximize the removal of chlorine ions and thereby ACH400 formation, it is necessary to anneal ACH at temperatures above ~400 °C.…”

Section: Ach Calcination To Produce Amorphous Ach400mentioning

confidence: 96%

“…The second peak at 180 °C indicates ACH decomposition, which is accompanied by a loss of more than 78 wt.% from the total mass. Ivanov et al [42] showed that this peak corresponds to the decomposition of ACH to Al2O3, H2O, and HCl by the following reaction: The TGA/DSC analysis was carried out in air atmosphere to determine the mass loss and main thermal effects present upon the heating of ACH. There are two endothermic peaks and one exothermic peak shown in Figure 7.…”

Section: Ach Calcination For Sga Productionmentioning

confidence: 99%

“…The second peak at 180 • C indicates ACH decomposition, which is accompanied by a loss of more than 78 wt.% from the total mass. Ivanov et al [42] showed that this peak corresponds to the decomposition of ACH to Al 2 O 3 , H 2 O, and HCl by the following reaction:…”

Section: Ach Calcination For Sga Productionmentioning

confidence: 99%

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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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Section: Ach Calcination To Produce Amorphous Ach400mentioning

confidence: 96%

Section: Ach Calcination For Sga Productionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Among various solid base catalysts, hydrotalcite-like compounds ([M 2+ 1−x M 3+ x (OH) 2 ] x+ A n− x/n ·mH 2 O) and their derivatives such as double metal oxides have been focused because their basicity can be tuned based on the diversity of cations and anions [3][4][5][6]. The tuning methods include changing cations during the synthesis and post anion exchange [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of cyclohexanone-formaldehyde resin catalyzed by rehydrated Mg–Al hydrotalcite

Guo

Jiang

Zhang

2015

Progress in Organic Coatings

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“…Исследования ведутся в основном в направлении разработки гетерофазных неспекаемых порошковых композитов, изготовляемых по энергосберегающей технологии связывания фазовых компонентов в «искусственный камень» при относительно низких температурах, порядка рабочей температуры катода, за счет введения связок. В качестве приемлемых наполнителей с точки зрения химической стойкости к жидкому алюминию и низкой стоимости обычно рассматриваются Al 2 O 3 и углерод, которые к тому же при определенных условиях участвуют в процессах формирования прочного монолитно-ÍÀÓ×ÍÛÅ ÈÑÑËÅÄÎÂÀÍÈß È ÐÀÇÐÀÁÎÒÊÈ го тела как вещества-связки [3][4][5][6][7][8][9]. Связующие твердеют при низких температурах, обеспечивая прочность заготовок как низкотемпературные связки-клеи, и в то же время действуют как высокотемпературный цемент.…”

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