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Dissolution of galena with ferric chloride and nitrate.

Fuerstenau MC

Reno, NV: U.S. Department of the Interior, Bureau of Mines, OFR 22-86, 1984 Dec; :1-58

10005023

The kinetics of leaching galena with ferric chloride and ferric nitrate have been examined as a function of ferric concentration, salt concentration, temperature, and particle size. Diffusivity of ferric complex ions was also established as a function of ferric chloride concentration and temperature. In the presence of 3m nacl, leaching rate is controlled by product layer diffusion when ferric chloride is added as oxidant. With nacl concentrations less than 3 mol/l, rate decreases with decreased nacl concentration, and thus, rate is apparently not controlled by product layer diffusion. It is suggested that rate is controlled by lead chloride solubility at the reaction interface under these conditions. When ferric nitrate is added as oxidant, leaching rate is limited by chemical reaction control. An electrochemical model is presented. Activation energies are 8.1 and 11.3 Kcal/mol in the ferric chloride and ferric nitrate systems, respectively.

Hydrometallurgy; Galena; Leaching; Reaction kinetics; Iron chlorides; Iron nitrates; Dissolving

19841201

CP; Final Contract Report

1985

PB86-169513

A05

OFR 22-86; Contract-J0215026

RERC

Reno, NV: U.S. Department of the Interior, Bureau of Mines, OFR 22-86

NV; SD

South Dakota School of Mines and Technology, Rapid City, South Dakota