Dissolution kinetics of malachite in ethylene diamine phosphate solutions
Peilun Shen 1
Ruizeng Liu 1
Dianwen Liu 1  
Xiaolin Zhang 1
Xiaodong Jia 1
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Kunming University of Science and Technology
Dianwen Liu   

Kunming University of Science and Technology
Publication date: 2019-06-18
Physicochem. Probl. Miner. Process. 2019;55(4):1039–1048
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 52.63kJ×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.