The removal of antimony from a refractory gold-bearing stibnite ore by
roasting and selective chlorinating roasting was investigated. The
influence of roasting temperature, roasting time, roasting atmosphere and
type and amount of chlorinating agents on antimony removal were
studied. The laboratory studies carried out included roasting tests of 4 g
samples in a laboratory rotary kiln, followed by 400 g samples roasted in
a fluidised bed. The test results revealed that antimony was efficiently removed by
roasting at temperatures over 800C in a nitrogen atmosphere. The most
efficient volatilisation of antimony was achieved with the addition of
ferric chloride at temperatures between 350-600C.