Sb distribution in the phases of SiO2 saturated Sb-Fe-O-SiO2-CaO system in air

J. Min. Metall. Sect. B-Metall., 57 (1) (2021) 13-19 DOI:10.2298/JMMB200406030Z
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Available online 09 December 2020
(Received 06 April 2020; Accepted 29 October 2020)
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Abstract

Sb distribution in the phases of SiO2 saturated Sb-Fe-O-SiO2-CaO system was determined for the first time through hightemperature experiment and quenching techniques, followed by Electron probe X-ray microanalysis (EPMA) in air (Ptot = 1 atm, PO2 = 0.21 atm). The phases were quantified in the temperature range of 900 °C-1200 °C and the effects of Fe/SiO2 (mass fraction) and CaO/SiO2 (mass fraction) on Sb2O3 content in the Sb-Fe-O-SiO2-CaO system were investigated at 1200 °C. The results indicated that the Sb-containing phase primarily existed in the solid solution phase at 1200 °C. With the increase of temperature from 1100 °C to 1200 °C, the Sb2O3 content in the solid solution phase increased drastically from 7.52 wt% to 17.36 wt%. Lowering the values of CaO/SiO2 and Fe/SiO2 in the smelting process effectively reduced Sb2O3 content in the slag. The verification of the experiment results suggested that the antimony content in slag was 0.57 wt%, the crude antimony yield rate was lower than 4%, and the crude antimony grade was beyond 94 wt%, which meant that the reduction of antimony content in the slag could be achieved.

Keywords: Phase relations; Liquidus; Microstructure; Pyrometallurgy
Correspondence Address:
H.-P. Nie*, K. Yan**,
Institute of Green Metallurgy and Process Intensification, Jiangxi University of Science and Technology, China,
email: This email address is being protected from spambots. You need JavaScript enabled to view it.;* This email address is being protected from spambots. You need JavaScript enabled to view it.;**

 

 

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