Optimization of sulfuric acid leaching of roasted chalcopyrite concentrate with Box–Wilson experimental design

Abstract

Chalcopyrite (CuFeS 2 ) is commonly used ore in production of copper, but leaching of this ore is very slow and inefficient due to "passivation" during leaching at atmospheric conditions. In this study, in order to overcome drawbacks of the passivation layers, the concentrate supplied from Eti Bakır A.Ş. Küre Plant in Turkey was roasted at 600 °C for 1 h and after leached. Box-Wilson procedure of statistical experimental design was utilized to identify the effects of significant leaching variables for instance leaching time (X 1 ; 10-120 min), solid/liquid ratio (X 2 ; 0.01-0.20), and H 2 SO 4 concentration (X 3 ; 0.01-1.00 M) on Cu extraction (%) from roasted concentrate and was tried to be optimized. The coefficients of response functions have been calculated by regression analysis, and the estimates have been found to be well in line with the experimental outcomes. The optimal leaching parameters, time, solid/liquid rate and H 2 SO 4 concentration were determined as 115 min, 0.116, and 0.71 M, respectively, and the highest Cu extraction (%) value was calculated as 92.45%.

Re-Synthesis of CIGS Nanocrystallites Using Oxidation Roasting Pretreatment from Spent CIGS Targets

“…Dead roasting is an alternative method for converting sulfide concentrates into oxides that can be easily reduced [16]. Alternative chalcopyrite treatment processes have been investigated, including the oxidative roasting of chalcopyrite and its related constituents, such as copper sulfide and iron sulfide [17]. Several technologies have been developed to retrieve valuable constituents from depleted CIGS materials, including pyrometallurgical and hydrometallurgical processes [18,19].…”