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

Lee, Man; Nguyen, Thi Hong

doi:10.3390/pr6040029

Cited by 16 publications

(6 citation statements)

References 24 publications

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“…The next patent (US 3,037,711) 29 devoted entirely to liberation of aluminum metal by crushing and grinding was issued in 1962 to Businger of Metallwerke Refonda, Weiderkehr & Co. for a dry milling process which uses a mill to flatten aluminum pieces that are then separated from the friable oxides by screening and air classification. 30 A literature survey [31][32][33][34] revealed a few works on crushing and milling as a method to separate aluminum metal. However, in the literature, there are a limited number of studies on the metallographic characterization of the dross phase separations and the size fractions after milling.…”

Section: Introductionmentioning

confidence: 99%

“…However, in the literature, there are a limited number of studies on the metallographic characterization of the dross phase separations and the size fractions after milling. [31][32][33][34] Moreover, in the literature the results are described using milling treatment of dross combined with salts, such as Nguyen et al 31 , who investigated the effect of a process consisting of ball milling followed by NaOH leaching to selectively dissolve alumina from black dross. These studies were all on black dross treatment, and it caused low Al recovery as a portion of metallic Al was lost in the process.…”

Section: Introductionmentioning

confidence: 99%

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Aluminum Recovery from White Aluminum Dross by a Mechanically Activated Phase Separation and Remelting Process

Kudyba

Akhtar

Johansen

et al. 2021

JOM

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The aluminum recovery from white aluminum dross by a mechanical treatment and sizing followed by remelting process was investigated. The dross was subjected to a ball mill, and the obtained particles were sized in different ranges. They were studied by advanced materials characterization techniques. It was found that the larger particles contain high metallic portions, and most non-metallic components of the dross are in the fine fraction < 1 mm. The Al-rich particles (> 1 mm) were remelted at 900°C to recover aluminum. It was found that the metal structure after remelting is homogeneous and consisted of a dominant metallic aluminum matrix, containing an average of > 96% Al with around 99% total metallic components. The results show that the applied method is a good economic alternative for the aluminum recovery from white dross, which is important for the valorization/recycling of industrial waste and circular economy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aluminum Recovery from White Aluminum Dross by a Mechanically Activated Phase Separation and Remelting Process

Kudyba

Akhtar

Johansen

et al. 2021

JOM

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“…Black dross is categorized as a hazardous material owing to the evolution of toxic gases when in contact with moisture. In hydrometallurgical processes for the recovery of alumina from black dross, alkaline leaching leads to purer aluminate (III) solution than acid leaching [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Effect of reaction time on the XRD of the precursor (dissolution of Al(OH)3 and MgO in acid) and the combustion product calcined at 1000 • C.…”

mentioning

confidence: 99%

Synthesis of Magnesium Aluminate Spinel Powder from the Purified Sodium Hydroxide Leaching Solution of Black Dross

Nguyen

Lee

2019

Processes

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Synthesis of magnesium aluminate spinel (MgAl2O4) was investigated by employing ball milling and co-precipitation methods. The starting materials (aluminum hydroxides) were obtained from the purified sodium hydroxide leaching solution of black dross. The characteristics of the synthesized spinel was analyzed through X-ray diffraction (XRD), scanning electron microscopy (SEM) images. In this work, the effect of calcination temperature and time on the formation of spinel by the two methods was compared. Calcination temperature showed a great effect on the formation of spinel in both methods. The results showed that the co-precipitation method has many advantages over the ball milling method. In ball milling method, complete conversion of the starting materials to spinel was impossible even at 1500 °C, while complete conversion to spinel was accomplished at 1000 °C for 5 h by the co-precipitation method. The average size of the spinel synthesized at these optimum conditions of the co-precipitation method was about 17 nm. A process can be developed to synthesize spinel from the black dross which is regarded as hazardous materials.

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“…In our previous work on the recovery of alumina from black dross, the NaOH leaching of the mechanically activated dross suppressed the dissolution of silica and resulted in a leaching solution where the purity of aluminate(III) was 98% [11]. Although the purity of aluminate(III) in the leaching solution is relatively high, removal of silicate(IV) from the leaching solution would increase the purity of aluminate(III).…”

Section: Introductionmentioning

confidence: 99%

The Removal of Silicate(IV) by Adsorption onto Hydrocalumite from the Sodium Hydroxide Leaching Solution of Black Dross

Nguyen

Lee

2019

Processes

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Alkaline leaching of mechanically activated black dross resulted in an aluminate(III) solution with a small amount of silicate(IV). To obtain pure aluminate(III) solution, the removal of silicate(IV) from the alkaline leaching solution was investigated by adsorption with hydrocalumite (Ca2Al(OH)6Cl·2H2O). The hydrocalumite was synthesized by the coprecipitation method. The characterization of the synthesized hydrocalumite was analyzed via X-ray diffraction (XRD), scanning electron microscopy (SEM) images and Fourier-transform infrared spectroscopy (FTIR). In our experimental conditions, silicate(IV) was selectively adsorbed onto hydrocalumite over aluminate(III). The reaction time greatly affected the removal percentage of aluminate(III) owing to mass action effect. When the reaction time was longer than 2 h, no aluminate(III) was adsorbed onto hydrocalumite and thus it was possible to selectively remove silicate(IV). When the dosage of hydrocalumite was in excess, the removal percentage of silicate(IV) was rather reduced. Complete removal of silicate(IV) from the solution was accomplished in the reaction temperature between 50 and 70 °C. By selective adsorption of silicate(IV) from the solution at the optimum condition (30 g/L hydrocalumite, 50 °C, 400 rpm, and 2 h), an aluminate(III) solution with purity higher than 99.9% was obtained. The adsorption of silicate(IV) onto hydrocalumite followed the Freundlich isotherm.

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

Cited by 16 publications

References 24 publications

Aluminum Recovery from White Aluminum Dross by a Mechanically Activated Phase Separation and Remelting Process

Aluminum Recovery from White Aluminum Dross by a Mechanically Activated Phase Separation and Remelting Process

Synthesis of Magnesium Aluminate Spinel Powder from the Purified Sodium Hydroxide Leaching Solution of Black Dross

The Removal of Silicate(IV) by Adsorption onto Hydrocalumite from the Sodium Hydroxide Leaching Solution of Black Dross

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