Abstract
Pyrite cinders, which are the waste products of sulphuric acid manufacturing plants, contain hazardous but valuable heavy metals. This passage introduced that iron recovery by two-stage roasting the pyrite concentrate and gold-leaching from the pyrite cinder by thiourea. After re-floating and two-stage roasting of the gold-bearing low-grade pyrite concentrate, the final cinder contains about 0.056% As and 61% Fe and high grade gold and silver. The thiourea gold-leaching experiment for the pyrite cinder shows the gold-leaching rate is up to 90.4% in the case of grinding fineness of 60%-0.074mm, pH = 1~2, R=1:2, thiourea dosage of 10g / L, ferric sulfate dosage of 3g / L, leaching time of 6h.
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