Abstract
Studies showed the possibility of arsenic removal from gold- and copper bearing ores and concentrates with high levels of arsenic (2-12%) under reducing-sulphidizing conditions, especially in the presence of pyrite. Pilot plant and industrial scale fluid bed reasting at 750-900°C showed that under reduction-sulphidizing conditions with pyrite and (or) coke the arsenic is eliminated as arsenic sulphide and greater than 99% arsenic can be eliminated from copper and gold concentrates containing 2-8% arsenic. With increasing temperature, duration of roasting, and pyrite addition, vaporization degree increases. The roasted calcine is suitable for pyrometallurgical or hydrometallurgical treatment.
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