Open AccessResearch features of opening of refractory arsenopyrite concentrates by using low-temperature roasting
Author(s) -
N. O. Zvontsov,
Д. А. Рогожников
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/966/1/012035
Subject(s) - roasting , arsenopyrite , pyrite , chemistry , arsenic , pyrometallurgy , metallurgy , leaching (pedology) , gold ore , mineralogy , materials science , environmental science , smelting , chalcopyrite , copper , soil science , soil water
The article describes an alternative pre-treatment method of refractory arsenopyrite concentrates using low temperature roasting. The process consists of carrying out oxidative roasting in the temperature range of 200–400 °C – relatively low for traditional process. The calculation results of the equilibrium composition of roasting products are presented on the example of a flotation gold-bearing concentrate of the Uderey’s deposit in the HSC Chemistry 6 program. The main concentrate minerals containing gold arepyrite (FeS 2 ) and arsenopyrite (FeAsS). In addition, the concentrate of the Uderey’s deposit is characterized by the presence of antimony in the form of Sb 2 S 3 . During the calculations of the equilibrium composition, the optimal conditions for low-temperature roasting were selected. It was found that under these conditions, the dissociation of higher sulfides occurs, arsenic goes into the form of trisulfide (As 2 S 3 ) and some of the iron goes into the form of sulfate (FeSO 4 ). All this suggests that the process of low-temperature roasting allows to open the refractory concentrate and get a cinder, the further processing of which will not cause special problems: the non-volatile form of arsenic trisulfide will not cause complications when cleaning exhaust gases, and iron sulfate will simplify further leaching processes.