Abstract
Spent MgO-Cr2O3 bricks contain various heavy metals and are considered as a hazardous waste. In order to utilize the waste, a novel process to recover the copper from the spent bricks by flotation was developed. The mineralogical characteristics of the bricks, the mechanisms of metal penetration, and the effects of grinding time, emulsified kerosene dosage, collectors, and Na2S addition on the copper recovery were investigated. The results indicated that the spent bricks were mainly composed of periclase, magnesiochromite, copper, cuprite, and magnesium copper oxide. The copper penetrated into the MgO-Cr2O3 bricks from cracks and holes, and the copper oxides are easier than metallic copper, while the metallic copper is easier than its sulfides in infiltrating into the bricks. The optimum flotation parameters were 7 min of grinding time, 200 g/t of emulsified kerosene, 400 g/t of sodium isoamyl xanthate, and 400 g/t of Na2S. Based on these conditions, about 95 wt % Cu was recovered from the bricks by a clo...
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