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

Abstract

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.

Resourceful cleaner preparation of Sb2O3 with vacuum vaporization- condensation from hazardous arsenic antimony dust

“…Arsenic and antimony, belonging to the same main group, exhibit analogous spatial structures. This similarity often results in As2O3 molecules intermingling with Sb2O3 molecules, leading to the formation of arsenic-antimony solid solutions Li et al 2023;Xu et al 2019). The volatility of this solid solution is intermediate between As2O3…”

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

“…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).…”