Hydroxamate Flotation of Malachite

Authors: Lenormand, J.; Salman, T.; Yoon, R. H.

Source: Canadian Metallurgical Quarterly, Number 2, April-June 1979 , pp. 125-129(5)

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Abstract:

The point of zero charge (PZC) of malachite has been determined to be pH 7.9, which is found to correspond closely to the weighted average of EP(Cu²⁺, HCO₃ ⁻) and EP(CuOH⁺, Cu(OH) ₃ ⁻) of the malachite-water-air system. The hydroxamate flotation of malachite is effective between pH 6 and 10, a region in which HCO₃ ⁻ and CuOH⁺ ions are the predominant potential determining ions for malachite. Adsorption measurements and infrared analysis indicate that in this pH range octyl hydroxamate chemisorbs on malachite surface. A proposed chemisorption mechanism suggests that a pair of HCO₃ ⁻ and OH⁻ ions is displaced for each hydroxamate ion adsorbed.

Résumé

On a déterminé que le PCN de la malachite se situe à un pH de 7.9, ce qui est très proche de la moyenne du PE(Cu²⁺, HCO₃ ⁻) et du PE(CuOH⁺, Cu(OH) ₃ ⁻) du système malachite-eau-air. On peut flotter la malachite en utilisant un hydroxamate comme collecteur entre un pH de 6 et de 10, ce qui correspond à la règion de prèdominance des ions HCO₃ ⁻ et CuOH⁺, en ce qui a trait au potentiel de la malachite. On a pu déterminer, à l'aide de mesures d'adsoption et d'analyses infrarouges, que l'octyl-hydroxamate est chemisorbé à la surface de la malachite à ces pH. On propose un méchamisme de chemisorption qui suggèrerait qu'une paire d'anions HC₃ ⁻ et OH⁻ est déplacée pour chaque ion hydroxamate adsorbé.

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/000844379795317913

Publication date: 1979-04-01

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Hydroxamate Flotation of Malachite

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