Kinetics of dissolution of synthetic covellite in aqueous acidic ferric sulphate solutions

作者: G. Thomas , T. R. Ingraham

DOI: 10.1179/CMQ.1967.6.2.153

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摘要: Abstract Covellite, CuS, was synthesized from metallic cu and elemental sulphur. The material ground pressed to form thin disks that were hardened by heat treatment. cemented a lucite holder mounted on shaft, .rotated at apeeds of up 1500 rpm, in 0.1 M H2SO4 solutions containing 0.25 ferric sulphate, temperatures 25° 80°C. Automated chemical analysis used determine the amount dissolved copper solutions. Near room temperature rate dissolution covellite FeIII appears be controlled process occurring an interface. apparent activation energy for this step is 22 kcal.mole−1. At near 80°C, reduced about 8 kcal.mole−1 which consistent with shift control transport ionic diffusion. For slow disk rotation speeds diluteferric ion solutions, dominant a...

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