Aluminium recovery during black dross hydrothermal treatment

Tsakiridis, P.E.; Oustadakis, P.; Agatzini-Leonardou, S.

doi:10.1016/j.jece.2013.03.004

Cited by 125 publications

(51 citation statements)

References 18 publications

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“…Pyrometallurgical and hydrometallurgical processes have been developed to recover aluminum, silica, and other components from black dross [4,5]. Both processes have advantages and disadvantages [4,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Although the leaching percentage of alumina via NaOH solutions is not as high as that via HCl solutions, an alkaline leaching solution has some selectivity for alumina because the oxides of Ca, Fe, and Mg will not dissolve in this medium [8]. Furthermore, pure aluminum hydroxide can be recovered from an alkaline leaching solution of black dross via crystallization or precipitation, which is considered economical and environmentally friendly [5,13].…”

Section: Introductionmentioning

confidence: 99%

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Ball Milling Treatment of Black Dross for Selective Dissolution of Alumina in Sodium Hydroxide Leaching

Lee

Nguyen

2018

Processes

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Abstract:A process consisting of ball milling followed by NaOH leaching was developed to selectively dissolve alumina from black dross. From the ball milling treatment, it was found that milling speed greatly affected the leaching behavior of silica and the oxides of Ca, Fe, Mg, and Ti present in dross. The leaching behavior of the mechanically activated dross was investigated by varying NaOH concentration, leaching temperature and time, and pulp density. In most of the leaching conditions, only alumina and silica were dissolved, while the leaching percentage of other oxides was negligible. The leaching percentage of silica decreased rapidly to nearly zero as pulp density increased to 100 g/L. At the optimum leaching conditions (5 M NaOH, 50 • C, 2 h, pulp density of 100 g/L), the purity of Al in the leaching solution was higher than 98%, but the leaching percentage of alumina was only 35%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ball Milling Treatment of Black Dross for Selective Dissolution of Alumina in Sodium Hydroxide Leaching

Lee

Nguyen

2018

Processes

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“…Depending on the scrap mix, the amount of dust produced per ton of secondary aluminium ranges from 3 to 13 kg and it is the second-largest solid waste generated, as the amount of black dross produced per ton of secondary aluminium ranges from 200 to 300 kg, whereas in case of rotary furnaces the amount of salt slag produced varies from 300 to 500 kg (The Aluminium Association 2013; Tsakiridis et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Cyclones and fabric filters dusts from secondary aluminium flue gases: a characterization and leaching study

Tsakiridis

Oustadakis

Μουστάκας

et al. 2016

Int. J. Environ. Sci. Technol.

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The present work aims at the characterization and leachability examination of aluminium dusts, generated during the secondary aluminium production from scrap. Two different types of dusts were examined: a cyclone aluminium dust and a fabric filter aluminium dust, derived from the waste gases de-dusting system, produced during the Al scrap meltdown. The characterization of both dusts was carried out using particle size distribution analysis, chemical analysis, X-ray diffraction and thermogravimetric/differential thermal analyses. Their microstructure and morphological characteristics were examined by scanning electron microscopy and transmission electron microscopy. The results showed that the basis of the examined dusts was different, as they consisted of different mixtures of metallic aluminium, salt flux constituents, aluminium oxide and aluminium nitrides. Their behaviour during leaching was determined by the toxicity characteristic leaching procedure test and the EN 12457-2 compliance leaching test. The results revealed that both dusts should be treated as hazardous wastes and in case of landfilling they should be disposed of at appropriate, regulation-prescribed waste dumps, after removing the watersoluble phases, such as chlorides or nitrides.

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“…In Spain, this industry produces around 35% of the total aluminum production. According to basically economical aspects, the disposal into landfills is mostly the final destination of the black dross, as Tsakiridis et al [1] described, but in many cases, dry milling processes are performed in order to recover the largest fraction of the remaining aluminum. These milling processes take place in other industries which are known as the aluminum tertiary industry.…”

Section: Introductionmentioning

confidence: 99%

Industrial aluminum hazardous waste as a new raw material for zeolite synthesis

López‐Delgado

Rodríguez

Padilla

et al. 2014

WIT Transactions on Ecology and the Environment

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In Spain, the secondary aluminum industry is a mature activity which produces 35% of the total aluminum production. This industry generates slag (black dross) with a valuable content of aluminum which is recovered by dry milling processes in the aluminum tertiary industry. The powdered fine solid is trapped in the sleeve filter suction system of the aluminum slag milling process. This solid is considered as a hazardous waste within the 10 03 21 group in the European Waste Catalogue (EWC), because of the very fine grain size (x 50 < 50 µm) and the presence of dangerous substances (metallic aluminum, AlN, heavy metals, etc.). The high aluminum nitride content, ranging between 2 and 24%, is remarkable and it releases ammonia gas in the presence of environmental humidity. The aim of this work was to evaluate the complete recovery of the fine powders coming from the sleeve filters in the aluminum tertiary industry, as a zeolite. Two types of zeolite, analcime and NaP were obtained by hydrothermal processes from the aluminum waste and silica as raw materials. Different compositions of wastes and parameters such as time and temperature were assayed to study their effects on the obtained zeolites. The materials were characterized by X-ray diffraction and scanning electron microscopy.

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Aluminium recovery during black dross hydrothermal treatment

Cited by 125 publications

References 18 publications

Ball Milling Treatment of Black Dross for Selective Dissolution of Alumina in Sodium Hydroxide Leaching

Ball Milling Treatment of Black Dross for Selective Dissolution of Alumina in Sodium Hydroxide Leaching

Cyclones and fabric filters dusts from secondary aluminium flue gases: a characterization and leaching study

Industrial aluminum hazardous waste as a new raw material for zeolite synthesis

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