XPS and FTIR studies of sodium arsenate vitrification by cullet

Zhao, Zongwen; Song, Yunfeng; Min, Xin; Liang, Yanjie; Chai, Liyuan; Shi, Meiqing

doi:10.1016/j.jnoncrysol.2016.08.028

Cited by 40 publications

(10 citation statements)

References 45 publications

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“…For the sample without charcoal powder, a sharp mass reduction was observed at temperatures ranging from 30 • C to 135 • C, which, in consistence with results indicated by Zhao et al [27], could be explained by the evaporation of crystal water:…”

Section: Thermodynamic Considerationsupporting

confidence: 88%

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Extraction of Metal Arsenic from Waste Sodium Arsenate by Roasting with Charcoal Powder

Yang

Qin

Liu

2018

Metals

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Abstract:The current paper explored the directly reductive decomposition of waste sodium arsenate by roasting it with charcoal powder to volatilize less toxic As 0 and to simultaneously obtain sodium salts with potential commercial value, serving the purpose of developing a more sustainable route to deal with the environmental issues faced by the antimony production industry in China. The process was firstly evaluated by thermogravimetric (TG) analysis and thermochemical calculations. The effects of N 2 flow rate, roasting temperature, dosage of charcoal powder, and roasting time were then investigated. The results showed that the arsenic extraction could reach 99.84% under optimal conditions. The roasting residue, containing arsenic as low as 0.0598%, was a promising source for the production of Na 2 CO 3 as expected. In addition, X-ray diffraction (XRD), scanning electron micrograph (SEM), and X-ray photoelectron spectroscopy (XPS) were conducted to reveal the roasting mechanism and formation of metal arsenic was thereby confirmed.

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Section: Thermodynamic Considerationsupporting

confidence: 88%

“…Due to the impurities in the sample, the mass ratio remains about 52% instead of the reported 49.05% [27]. Meanwhile, taking into account the presence of NNH, the following reaction could also happen: Na 3 AsO 4 ·0.25NaOH·12H 2 O = Na 3 AsO 4 + 0.25NaOH + 12H 2 O(g)…”

Section: Thermodynamic Considerationmentioning

confidence: 97%

Extraction of Metal Arsenic from Waste Sodium Arsenate by Roasting with Charcoal Powder

Yang

Qin

Liu

2018

Metals

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“…Cadmium stability in the wastes is a vital factor that should be considered when using slag to immobilize Cd. According to previous studies [42,43], the cadmium stability is closely related to the cadmium chemical speciation. Therefore, a BCR experiment has been conducted to test the cadmium chemical speciation in the CBR.…”

Section: Chemical Speciation Analyses Of Cadmiummentioning

confidence: 93%

Stabilization/Solidification Treatment of Cadmium-Bearing-Residue with Magnesium Slag

Chen

Han

Liang

et al. 2019

Pol. J. Environ. Stud.

Self Cite

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Cadmium-containing industrial and residual wastes are one of big problems in the environment [1-3]. Numerous treatment methods, such as the stabilization/ solidification (S/S) process, have been developed to prevent cadmium pollution [4, 5]. S/S has been widely used because of the short processing time, wide application scope, simple operation, economic and remarkable solidification effect [6]. Binder is the key to the S/S process. Many binders like cement, smelting slag, modified clays and geopolymer were extensively studied and applied into practice [7-9]. It is still important to discover a new binder in large scale according to the background of enterprise and the location. Magnesium slag is a sub-product generated in production of the metallic magnesium. At the present level of advanced enterprises, magnesium slag of 5-6 kg is generated from the production of 1 kg magnesium [10]. Many scholars have studied the

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“…9, the peak of Si2p shifts towards to the low binding energy with increasing temperature, indicating the increasing of the valence electron density of Si atoms (Dalby et al 2007). The research (Zhao et al 2016) certi es that the Si-O-Si bindings can be translated into Si-O-Fe and Si-O-As bindings when arsenic atoms are introduced into glass. As can be seen in Fig.…”

Section: Xps Analysis Of the Simulated Slagmentioning

confidence: 99%

“…In order to reduce the toxicity of arsenic, solidi cation/stabilization (S/S) technology is always applied to dispose arsenic-bearing waste by restricting the mobility of As atoms. Several methods have been proposed to reduce arsenic contamination, such as cement solidi cation (Kundu and Gupta 2008;Yin et al 2019;Yoon et al 2010), geopolymer solidi cation (Shi et al 2017;Xu et al 2006) and vitri cation solidi cation (Shi et al 2015; Zhao et al 2015;Zhao et al 2016). As for the cement solidi cation method, arsenic atoms can be immobilized by three ways: Firstly, arsenic-bearing wastes can be enwrapped by cement (Liu et al 2018); Secondly, arsenic can react with cement and form insoluble calcium-arsenic compounds (Vandecasteele et al 2002), such as Ca 3 (AsO 4 ) 2 and CaHAsO 3 ; Thirdly, arsenic can be absorbed onto the surface of calcium silicate hydrate (C-S-H) (Li et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxygen Content and Temperature On Stabilization of Arsenic in Copper Smelting System

Zhang

et al. 2021

Preprint

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Arsenic-bearing wastes from copper smelting system are usually disposed by trapping them in slag tailing. However, arsenic in slag tailing is not that stable, which can infiltrate into the groundwater, threatening the environment and human health. The solidification/stabilization (S/S) of arsenic is the only way to deal with arsenic contamination. The flash smelting method shows relatively high S/S ability of arsenic, but the process and mechanism remain unclear. In this paper, we aim at revealing the effect of atmosphere on the S/S process of arsenic owing to the different content of oxygen in reaction shaft and sedimentation tank in copper smelting system. Calcium arsenate, SiO2, Fe2O3 and iron powders were sintered at different temperature in air and argon to simulate the S/S reaction. The results show that the sintering product is Fe-Si oxide in air and fayalite in argon, and the fayalite possesses better capacity to solidify arsenic than that of Fe-Si oxide. The toxicity characteristic leaching procedure (TCLP) results reveal that the leached concentration of arsenic from fayalite fabricated at 1200 ℃ is only 2.916 mg L-1, which satisfies the identification standard for hazardous substances in China. Furthermore, the theoretical calculation reveals that AsO4 and SiO4 tetrahedrons can be connected by O atoms when sintered in argon, and the Si-O-As covalent bond can evidently inhibit the release of As atom from fayalite. This work can not only clarify the S/S mechanism of arsenic in flash smelting process, but also provide theoretical guidances to dispose arsenic-bearing waste harmlessly.

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XPS and FTIR studies of sodium arsenate vitrification by cullet

Cited by 40 publications

References 45 publications

Extraction of Metal Arsenic from Waste Sodium Arsenate by Roasting with Charcoal Powder

Extraction of Metal Arsenic from Waste Sodium Arsenate by Roasting with Charcoal Powder

Stabilization/Solidification Treatment of Cadmium-Bearing-Residue with Magnesium Slag

Effect of Oxygen Content and Temperature On Stabilization of Arsenic in Copper Smelting System

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