Copper solvent extraction from chalcopyrite concentrate acid leach solutions by LIX 984

Abstract

Copper production from ores or sulphide concentrates is classically realized by pyrometallurgical route. In this study, hydrometallurgical treatment of a copper sulphide concentrate, provided by Hajar Mine (ONA-Group, Morocco), was tested by using a mixture of nitric and hexafluorosilicic acids. Copper is present in the solid product as chalcopyrite and its amount is 28.1 % by weight. Leaching stage allows to dissolve more than 90% of copper witch is accompanied, in the same averages, by Zn and Fe. The leach solution obtained has pH = 0.6 and Eh = 580 mV/ENH and contains 19.3 g/L Cu, 18.1 g/L Fe, 4.5 g/L Zn and 0.03 g/L Pb. The recovery of copper from this leach solution was curried out by solvent extraction using Lix 984, diluted in Escaid 110. McCabe - Thiele distribution isotherms showed that at pH 1.7 total and selective copper extraction can be realized with Øo:Øa =1.5:1 in 3 extraction stages. Stripping of the loaded copper by treating the organic phases was easily obtained by a sulphuric acid solution

Design for optimizing copper extraction from aqueous solution using LIX984N extractant

“…Уусмалын орчин хүчтэй хүчиллэг байхад хандлагчийн хандлах чадварт муугаар нөлөөлсөн байна. Зэс сонгомлоор хандлагдах уусмалын орчин рН 1.7, органик ба усан фазын харьцааг 1.5:1 байхаар авч, хандлалтыг гурван үе шаттай хийхэд зэс 51% хандлагдсан байна [6]. Хятад улсын судлаачид сульфатын уусмал дахь Cu 2+ , Ni 2+ -ийг микро сувгийн чип ашиглан LIX984N хандлагчаар хурдан ялгах судалгааг хийхдээ О:У=1:1, рН=2.5, хандлах хугацаа 50 секунд ба хандлагчийн концентрацыг 15%-иар авч, зэс авалт 95% хүртэл байв [7]…”