Separation and Recovery of Antimony from High Arsenic-bearing Flue Dusts through Selective Oxidation Using MnO&lt;sub&gt;2&lt;/sub&gt;

Li, Lei; Wang, Fuyou; Zhong, Dapeng; Tan, Cheng; Yu, Yong

doi:10.2355/isijinternational.isijint-2016-362

Cited by 13 publications

(3 citation statements)

References 15 publications

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“…The starting materials roasted in these studies were either pure compounds (As-and Sb-oxides and sulfides) [1][2][3][4] or dusts from non-ferrous pyrometallurgical processes, high in Sb and As contents. [5][6][7][8] These studies highlighted the attribute of vapor-phase complexation of volatile species of Sb and As leading to the formation of complex gaseous oxides, As n Sb 4Àn O 6 (g) and sulfides, As n Sb 4Àn S 6 (g), n = 1, 2, 3. Thermodynamic data for the vapor-phase complex oxides, As n Sb 4Àn O 6 (g) (n = 1, 2, 3), were determined by Li et al [1] These calculations were based on the exceptional property of zero heat of disproportionation reactions of these mixed oxide compounds [9,10] and the results of vapor transport experiments using As 2 O 3 (s) and Sb 2 O 3 (s).…”

Section: Introductionmentioning

confidence: 99%

Volatilized and Condensed Sb- and As-Bearing Phases Produced During Roasting of Cu-Rich Complex Concentrate in Nitrogen Atmosphere with Oxygen in Traces

Prasad

Lennartsson

Samuelsson

2021

Metall Mater Trans B

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A Cu-rich complex sulpfide concentrate (containing Sb as sulphosalts and gudmundite, and As as arsenopyrite) is roasted in Nitrogen atmosphere carrying traces of oxygen ($${\text{p}}^{{\text{O}}_{2}} \approx {10}^{-5.3}\text{ bar)}$$ p O 2 ≈ 10 - 5.3 bar) . In situ measurements through QMS indicated that the volatilized species are mainly elemental sulfur, S2(g), and gaseous sulfur oxides. Sb- and As-bearing volatilized species could not be detected, owing to their low concentrations in the gas phase. Characterization studies through XRD and SEM-EDS confirmed that the condensates collected at room temperature during the roasting experiments comprised of (1) cyclo-octa sulfur, S8(s) and polysulfur oxides, Sn−xOx(s); (2) amorphous trisulfides of Sb and As; (3) and cubic crystalline trioxides of Sb and As. The solid phases in the condensate were found to be fine-sized (sub-micronic) and widely intermixed. Consequently, quantification of the solid phases in the condensates through direct measurement techniques like QEMSCAN was not possible. A novel approach of partial quantification of solid phases in the condensate through a stochastic model-based calculation approach is also presented. The model results suggested the occurrence of vapor-phase complexation of sulfides of Sb and As in the gas phase. Additional attributes of the volatilized species could be determined through a thermodynamic equilibrium calculation showing that the formation of the complex oxides, As4−nSbnO6(g), would be negligible compared to that of the complex sulfides, As4−nSbnS6(g).

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Section: Introductionmentioning

confidence: 99%

Volatilized and Condensed Sb- and As-Bearing Phases Produced During Roasting of Cu-Rich Complex Concentrate in Nitrogen Atmosphere with Oxygen in Traces

Prasad

Lennartsson

Samuelsson

2021

Metall Mater Trans B

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“…Thus, several recent methods for the treatment of As–Sb dust using CuO and MnO 2 as weak oxidants have been proposed. 26,27 In these methods, the structure of the As–Sb solid solution is effectively destroyed, and the arsenic removal rate can reach over 90 mass % with an antimony loss rate of less than 9%. Most Sb is retained in the roasted residue in the form of Sb 2 O 4 , and the Cu and Mn are retained in the forms of Cu 2 O and Mn 3 O 4 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Structural Destruction of As–Sb Solid Solution through a Selective Oxidation Process in the Presence of CaO and Its Effect on As Removal from the As–Sb Dust

Mao

2019

ACS Omega

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As–Sb dust from metallurgical processes causes serious environmental issues due to the presence of the toxic element As. In this study, a facile method for removing As through the destruction of the As–Sb solid solution structure from the dust using CaO under an oxidizing atmosphere was processed. The effects of the variables, including the amount of CaO added, roasting temperature and time, and oxygen partial pressure, on the volatilization of As and Sb were investigated. Under an oxidizing atmosphere in the presence of CaO, the formation of the vitreous material (As–Sb–O) was hindered through the transformation of Sb 2 O 3 and (As, Sb) 2 O 3 in the untreated dust into Sb 2 O 4 , Sb 2 O 5 , Sb 6 O 13 , and Ca 2 Sb 2 O 7 , and the volatilization of arsenic was promoted, as a result. The volatilization attained for As was 91.53% whereas that for Sb was only 4.30% under the following optimum conditions: 5 mass % CaO, a roasting temperature of 550 °C, an O 2 partial pressure of 21 vol % (air), and a roasting time of 80 min.

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“…[1][2][3] Due to the depletion of antimony primary ore resource, recovery of it from secondary resources has gained attention, such as from Sb-bearing slags, As-Sb dust and Sb alloy scraps. [4][5][6] The corresponding processing methods existed mainly consists of pyrometallurgical and hydrometallurgical processes, and the separation of Sb from As and/or Pb compounds is the key problem. A high separation rate of As from Sb phases could be obtained in the previous researches.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Sb and Fe from Sb-bearing Slags through a Reduction Roasting Process with Low Density Polyethylene

Tan

et al. 2019

ISIJ Int.

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A novel method for treating the Sb-bearing slag using LDPE as a reductant under N 2 atmosphere is proposed. The H 2 , CH 4 and C 2 (C 2 H 6 , C 2 H 4 , C 2 H 2) are released quickly during the LDPE pyrolysis process, and some of them have escaped off the roasting system before the reaction with the Sb-bearing slag. The Sb, Pb and Fe phases in the original Sb-bearing slag could be selectively reduced to Sb 4 O 6 , Pb and Fe 3 O 4 respectively by the pyrolysis gas at roasting temperature of 1 000°C and LDPE amount of 25 wt%. The Sb 4 O 6 could be separated and recovered effectively with the volatilization rate of 93.51% accompanying the Pb volatilization rate was only around 0.68% and the Fe phase was almost transformed into Fe 3 O 4 retaining in the residue. Then the Fe 3 O 4 can be separated and collected from the roasted residues using magnetic separation process.

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Separation and Recovery of Antimony from High Arsenic-bearing Flue Dusts through Selective Oxidation Using MnO<sub>2</sub>

Cited by 13 publications

References 15 publications

Volatilized and Condensed Sb- and As-Bearing Phases Produced During Roasting of Cu-Rich Complex Concentrate in Nitrogen Atmosphere with Oxygen in Traces

Volatilized and Condensed Sb- and As-Bearing Phases Produced During Roasting of Cu-Rich Complex Concentrate in Nitrogen Atmosphere with Oxygen in Traces

Structural Destruction of As–Sb Solid Solution through a Selective Oxidation Process in the Presence of CaO and Its Effect on As Removal from the As–Sb Dust

Recovery of Sb and Fe from Sb-bearing Slags through a Reduction Roasting Process with Low Density Polyethylene

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