Incorporation of arsenic into gypsum: Relevant to arsenic removal and immobilization process in hydrometallurgical industry

Zhang, Danni; Yuan, Zidan; Wang, Shaofeng; Jia, Yongfeng; Demopoulos, George P.

doi:10.1016/j.jhazmat.2015.07.015

Cited by 86 publications

(28 citation statements)

References 29 publications

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“…During the neutralization, arsenate and arsenite in the waste acid were prone to precipitated by Ca 2+ with the increase of nal pH. 13,54 Those arsenic compounds were mixed with gypsum, resulting in the increase of arsenic leaching concentration for gypsum and a decrease of arsenic concentration in waste acid (Fig. 3B).…”

Section: Calcium Carbonate Neutralizationmentioning

confidence: 99%

Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite

Wei

et al. 2020

RSC Adv.

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Section: Calcium Carbonate Neutralizationmentioning

confidence: 99%

Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite

Wei

et al. 2020

RSC Adv.

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“…However, when the pH value was 2, H 3 AsO 4 would begin to ionize. Arsenic adsorbed more readily on the precipitates [19], then the arsenic content in the precipitates would increase rapidly. When the pH was 1.9 and the neutralizer was CaCO 3, the concentrations of heavy metals in precipitate (Table 2) were low, less than the 0.1 wt.…”

Section: Arsenic Removal In the 1st Stagementioning

confidence: 99%

A novel strategy for arsenic removal from dirty acid wastewater via CaCO3-Ca(OH)2-Fe(III) processing

Lü

Chen

et al. 2016

Journal of Water Process Engineering

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“…The main mechanisms of these include the adsorption of arsenate via surface complex on iron oxides (hematite goethite) and ferrihydrite mainly as an inner-sphere bidentate complex [16][17][18][19] and the formation of insoluble Fe-As compounds, ferric arsenate, scorodite and poorly crystalline ferric arsenate [20][21][22]. Additionally, Al ions, hydroxide and oxide of aluminum also showed good behaviors in adsorbing arsenic as well as Fe [23,24].…”

Section: Introductionmentioning

confidence: 99%

Solidification/Stabilization of Arsenic in Red Mud upon Addition of Fe (III) or Fe (III) and Al (III) Dissolved in H<sub>2</sub>SO<sub>4</sub>

Yang

Sasaki

Endo

2018

J. of Wat. & Envir. Tech.

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In the aluminum industry, as an alkaline waste, red mud is composed of Fe and Al. It is difficult to safely dispose certain types of some arsenic-containing red mud owing to hazardous arsenic leaching. Hence, the method of arsenic stabilization using Fe (III) or H 2 SO 4 to reduce arsenic leaching from red mud was investigated. The results indicated that the addition of 3 − 5% Fe 2 (SO 4 ) 3 or H 2 SO 4 (ratio of H + (mM)/red mud (g) ≈ 1.5) into red mud and maintaining the pH at 4 until dryness was achieved at room temperature, decreased arsenic solubility from 360 to 2 − 6 µg/L (< 10 µg/L: Environmental criteria in Japan) and maintained the same for several months. In the mechanism of arsenic stabilization, Fe 3+ ions added or Fe 3+ and Al 3+ ions dissolved from red mud by adding H 2 SO 4 reacted with arsenic and formed insoluble Fe-As and Al-As compounds. Through X-ray diffraction analysis, insoluble arsenic compounds including iron arsenate, iron hydrogen arsenate, aluminum arsenate, and aluminum arsenate hydrate were detected and considered as responsible for low arsenic leaching. Additionally, the results suggested that HCl was not appropriate for stabilizing arsenic in red mud because the high amounts of Cl − negatively influence the formation of insoluble arsenic compounds.

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Incorporation of arsenic into gypsum: Relevant to arsenic removal and immobilization process in hydrometallurgical industry

Cited by 86 publications

References 29 publications

Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite

Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite

A novel strategy for arsenic removal from dirty acid wastewater via CaCO3-Ca(OH)2-Fe(III) processing

Solidification/Stabilization of Arsenic in Red Mud upon Addition of Fe (III) or Fe (III) and Al (III) Dissolved in H<sub>2</sub>SO<sub>4</sub>

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