Fabrication and Characterization of Aluminum Dross-Containing Mortar Composites: Upcycling of a Waste Product

Dai, Chen; Apelian, Diran

doi:10.1007/s40831-016-0071-7

Cited by 20 publications

(12 citation statements)

References 8 publications

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“…In order to obtain the maximum leaching rate of elemental aluminum, the optimal experimental scheme (1.6 molar ratio, 80˚C) for the acid leaching procedure was selected. However, the filtrate mainly contained aluminum sulfate CuSO NaOH Cu OH Na SO + → ↓ + (13) In the process of Al(OH) 3 preparation, the color of the product mainly appeared white at pH 7 -8; however, the precursor color gradually deepened to reddish brown color at higher pH, see Figure 5. This indicated that the precursor preparation process contained more impurity components.…”

Section: Purification Of Al(oh)3mentioning

confidence: 99%

“…Furthermore, aluminum dross can be divided into primary and secondary aluminum dross (SAD), depending on its recycling process times and its metallic aluminum content. Unfortunately, it is difficult to extract metal aluminum from SAD due to too low content [11] [12] [13]. Elemental aluminum extraction methods mainly include acid (sulfuric acid method, hydrochloric acid method) and alkaline leaching method, whereby the purpose is to separate the elemental aluminum from other impurities [14].…”

Section: Introductionmentioning

confidence: 99%

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Recycling of Secondary Aluminum Dross to Fabricate Porous γ-Al2O3 Assisted by Corn Straw as Biotemplate

Zhang¹,

Zhu²,

Li³

et al. 2019

MSCE

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In the aluminum industry, secondary aluminum dross (SAD) is an inevitable solid residue, which usually contains 30-70 wt% Al 2 O 3. In this work, Al(OH) 3 was extracted from SAD through acid-leaching and alkali purification process. The as-obtained Al(OH) 3 precipitation then was calcinated to synthesize porous γ-Al 2 O 3 assisting by an agricultural waste biomass-corn straw as biotemplate. Effects of H 2 SO 4 concentration, reaction temperature and time on the recovery of SAD were investigated. Furthermore, the dependence of calcination temperature on specific surface area, pore volume and content of porous γ-Al 2 O 3 was analyzed. X-ray diffraction (XRD) and X-ray fluorescence (XRF) were used to inspect the phase compositions and their contents, respectively. Scanning electron microscopy (SEM) was employed to analyze the morphologies of the sintered porous γ-Al 2 O 3. It was found that the highest recycle rate of aluminum from SAD was obtained under optimum conditions of 80˚C, acid concentration of 1.6 mol/l, and reaction time of 5 h by acid process. The porous γ-Al 2 O 3 with specific surface area, 261.22 m 2 /g and average pore diameter, 52.64 nm, was obtained under calcination at 850˚C through mixing the as-obtained Al(OH) 3 precipitation and corn straw.

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Section: Purification Of Al(oh)3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recycling of Secondary Aluminum Dross to Fabricate Porous γ-Al2O3 Assisted by Corn Straw as Biotemplate

Zhang¹,

Zhu²,

Li³

et al. 2019

MSCE

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“…Various methods have been proposed for the recovery of alumina from SAD [5][6][7][8]. In addition, several products are manufactured for exclusive utilization of SAD, including building materials [9][10][11][12], refractories [13,14], deoxidizers, molecular sieves [15][16][17] and compound occulants [18]. The correct treatment of AlN is very important during these processes.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Hydrolysis of Aluminum Nitride from Secondary Aluminum Dross Through Combination of Wet-Stirred Milling and Alkaline Leaching

Guo

et al. 2023

Waste Biomass Valor

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Deep hydrolysis for removing hazardous aluminium nitride (AlN) from secondary aluminum dross (SAD) remains a challenge nowadays. Enhanced hydrolysis of AlN from SAD through a combination of wetstirred milling and alkaline leaching is investigated in the present study, which has not been reported before. SAD is activated during wet-stirred milling just with water by reducing the grain size and increasing the active surface area. Leaching with NaOH dissolves the hydrolysis products (AlOOH, Al(OH) 3 ) to expose reactive sites of unhydrolyzed AlN, contributing to the enhanced hydrolysis process.Results indicate that by utilizing optimized conditions (10 min wet milling, 5 wt.% NaOH solution, L/S ratio of 2, 75 ℃ temperature, and 120 min duration), 98.3% of AlN is removed from SAD. The kinetic analysis indicates that the hydrolysis process is controlled by both diffusion and chemical reactions, with the activation energy calculated to be 31.0 kJ/mol. After undergoing this enhanced hydrolysis process, the residue, which consisted primarily of Al 2 O 3 and Al(OH) 3 ,can be recycled as Al concentrate. The technology has been already applied in a pilot plant and achieved a favorable effect in practical applications. Statement of NoveltyE cient hydrolysis for removing hazardous aluminium nitride (AlN) from secondary aluminum dross (SAD) remains a challenge nowadays. An enhanced hydrolysis process for removing AlN from SAD has been developed and reported in this study. The results demonstrate that the progress is highly e cient and can be performed using a combination of wet-stirred milling and alkaline leaching. This solution has not been reported before, and relevant patent authorization has been obtained by our research group.The technology has been already applied in a pilot plant that processes 20000 tons of SAD per year, achieving a favorable effect in practical applications, facilitating the disposal of waste and the protection of environment.

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“…In cement and concrete technology, the substitution of aluminium dross for sand as a filler to produce bricks and other building materials can improve the stiffness and stability of the material (Kim et al, 2010). The use of aluminium dross also increases the compressive strength and porosity of cement as a raw starting material for construction and delays the setting time of concrete (Elinwa & Mbadike, 2011;Mailar et al, 2016;Reddy & Neeraja, 2016;Dai & Apelian, 2016). In addition, the oxide compounds, such as aluminium oxide and magnesium oxide, have great potential as industrial grade refractories (Li et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Performance of PAFS Coagulant Derived from Aluminium Dross

Li¹,

Sobri²

2022

JST

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Polymerised aluminium ferric sulphate (PAFS) was prepared from aluminium dross as a coagulant in wastewater treatment. The effects of leaching time, leaching temperature, and sulfuric acid concentrations on the turbidity removal of the wastewater were investigated, and the optimum conditions were determined using response surface methodology. The results showed that the optimum PAFS preparation conditions were at a leaching time of 60 minutes, a leaching temperature of 65°C, and a sulfuric acid concentration of 1 mol/L. Furthermore, experiments were performed to investigate the effect of coagulant dosages using the PAFS prepared under the optimum leaching conditions, settling time and initial pH of the wastewater on the turbidity removal efficiency. As a result, it was found that the optimum coagulation conditions for PAFS coagulants were at a settling time of 15 minutes, coagulant dosage of 0.5g, and raw water pH 8. Under these optimum conditions, the turbidity removal efficiency of the wastewater was 91.45%. The purpose of this study was to investigate the possibility of aluminium dross utilisation as a coagulant agent for wastewater treatment. Therefore, it can be concluded that PAFS prepared by leaching metal oxides from aluminium dross is an effective wastewater coagulant.

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Fabrication and Characterization of Aluminum Dross-Containing Mortar Composites: Upcycling of a Waste Product

Cited by 20 publications

References 8 publications

Recycling of Secondary Aluminum Dross to Fabricate Porous <i>γ</i>-Al<sub>2</sub>O<sub>3</sub> Assisted by Corn Straw as Biotemplate

Recycling of Secondary Aluminum Dross to Fabricate Porous <i>γ</i>-Al<sub>2</sub>O<sub>3</sub> Assisted by Corn Straw as Biotemplate

Enhanced Hydrolysis of Aluminum Nitride from Secondary Aluminum Dross Through Combination of Wet-Stirred Milling and Alkaline Leaching

Synthesis and Performance of PAFS Coagulant Derived from Aluminium Dross

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Fabrication and Characterization of Aluminum Dross-Containing Mortar Composites: Upcycling of a Waste Product

Cited by 20 publications

References 8 publications

Recycling of Secondary Aluminum Dross to Fabricate Porous &lt;i&gt;γ&lt;/i&gt;-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Assisted by Corn Straw as Biotemplate

Recycling of Secondary Aluminum Dross to Fabricate Porous &lt;i&gt;γ&lt;/i&gt;-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Assisted by Corn Straw as Biotemplate

Enhanced Hydrolysis of Aluminum Nitride from Secondary Aluminum Dross Through Combination of Wet-Stirred Milling and Alkaline Leaching

Synthesis and Performance of PAFS Coagulant Derived from Aluminium Dross

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Product

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Recycling of Secondary Aluminum Dross to Fabricate Porous <i>γ</i>-Al<sub>2</sub>O<sub>3</sub> Assisted by Corn Straw as Biotemplate

Recycling of Secondary Aluminum Dross to Fabricate Porous <i>γ</i>-Al<sub>2</sub>O<sub>3</sub> Assisted by Corn Straw as Biotemplate