The Application of a Mixed Kinetics Leaching Model to an Ore Containing an Assemblage of Different Copper Minerals.
Madsen BW; Wadsworth ME
Proc Am Nuc Soc Topical Mtg on in Situ Proc Ener & Min Res Rec Colorado, 4/77 Pp 619-30 :12 pages
The federal Bureau of Mines has developed a mathematical model describing acidic ferric sulfate leaching of copper from sulfide ores to aid in improving dump leaching operations. The model is based on a steady-state approximation of the continuity equation for diffusion of ferric ions in the rock pores and the intrinsic leaching kinetics of the various sulfide mineral particles. Ore characteristics included in the model were particle size, particle shape, grade, mineral content, and mineral particle size. The continuity equation was used with ferric ion activity gradients and a fixed value for the diffusion coefficient. Except for diffusivity, each of these factors was either measured experimentally or estimated from theoretical considerations. The effective diffusivities were determined by fitting calculated leaching curves with experimental leaching data. The model accurately predicted copper extraction from an 8-ton sample during nearly 500 days of leaching.
Proc. Am. Nuc. Soc. Topical Mtg. on in Situ Proc. Ener. & Min. Res. Rec., Colorado, 4/77, Pp619-30