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- W2030751572 abstract "Over the temperature range 60° to 95°C, sintered discs of synthetic enargite (Cu3AsS4) were dissolved slowly in acidified ferric sulphate solutions, yielding both elemental and sulphate sulphur, together with soluble copper and arsenic. The dissolution kinetics were linear and this was interpreted as indicating rate control by a reaction occurring on the surface of this sulphosalt. The activation energy associated with this reaction was 13.3 kcal/mole. The rate of copper extraction increased according to the 0.55 power of the ferric sulphate concentration and the 0.20 power of the sulphuric acid concentration. The rate decreased in a complex manner with increasing strengths of the ferrous sulphate reaction product. Natural enargite dissolves like the synthetic sulphosalt and at approximately the same rate. Résumé A des températures variant entre 60°C et 95°C, des disques frittés d'énargite synthétique (Cu3AsS4) ont été dissous lentement dans des solutions acides de sulfate ferrique, pour produire du soufre élémentaire et sous forme de sulfate, ainsi que du cuivre et de l'arsenic soluble. Les cinétiques de dissolution suivent une loi linéaire, due à la réaction qui a lieu en surface de ce sulfosel et qui, semble-t-il, contrôlerait la dissolution. L'énergie d'activation associée à la réaction est de 13.3 kcal/mole. Le taux d'extraction du cuivre croît comme la puissance 0.55 de la concentration en sulfate ferrique et la puissance 0.20 de la concentration en acide sulfurique. La vitesse décroît de façon complexe lorsque augmente la concentration du produit de la réaction du sulfate ferreux. L'énargite naturelle se dissout de la même manière que le sulfosel synthétique, et à sensiblement la même vitesse." @default.
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- W2030751572 date "1972-07-01" @default.
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- W2030751572 title "The kinetics of dissolution of enargite in acidified ferric sulphate solutions" @default.
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- W2030751572 doi "https://doi.org/10.1179/cmq.1972.11.3.469" @default.
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