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- Title
Dissolution kinetics of malachite in ethylene diamine phosphate solutions.
- Authors
Peilun Shen; Ruizeng Liu; Dianwen Liu; Xiaolin Zhang; Xiaodong Jia; Kaiwei Song
- Abstract
Ethylene diamine phosphate (EDP), as a synthetic organic reagent, was used for the first time to leach malachite, and a new method of using organic amine to leach copper oxide ore was developed. The effects of stirring speed, particle size, reagent concentration, and reaction temperature on EDP-dissolution malachite were investigated. Results showed that malachite rapidly dissolved in EDP solution. The malachite-dissolving rate also increased with increased reagent concentration, increased reaction temperature, and decreased particle size. Stirring speed exhibited nearly no effect on EDP-induced malachite dissolution. The leaching kinetics was found to follow the shrinking-core model, and dissolution was controlled by surface chemical reaction with an activation energy of 52.63 kJ×mol-1. A semiempirical rate equation was obtained to describe the dissolution process expressed as 1-(1-XCu)1/3=0.0149(CEDP)0.7814 × (Pmalachite)-0.7982×exp(-6.3308/T) ×t.
- Subjects
ETHYLENEDIAMINE; MALACHITE; COPPER oxide; COPPER ores; DISSOLUTION (Chemistry)
- Publication
Physicochemical Problems of Mineral Processing, 2019, Vol 55, Issue 4, p1039
- ISSN
1643-1049
- Publication type
Article
- DOI
10.5277/ppmp1902