Extraction Rates of Zinc with Ammonium Chloride Salts of Amberlite LA-2 in a Horizontal Rectangular Channel

Abstract

Extraction rates of zinc with ammonium chloride salts of Amberlite LA-2 in hexane were measured in a horizontal rectangular channel. The experimental results were analyzed by considering the processes of diffusion in both solutions, adsorption and desorption to/from the interface and reactions at the interface for the species related as following steps;

(BHCl)_2,org + σ = (BHCl)_2,ad (1)

(BHCl)_2,ad + ZnCl_i,aq^–(i–2) = (BH)₂ZnCl_4,ad + (i – 2)Cl_aq^– (2)

(BH)₂ZnCl_4,ad = (BH)₂ZnCl_4,org + σ (3)

(BH)₂ZnCl_4,org + (BHCI)_2,org = (BH)₄ZnCl_6,org (4)

2(BH)₂ZnCl_4,org = ((BH)₂ZnCl₄)_2,org (5)

The extraction rates of zinc was interpreted from the rate equation that the interfacial reaction between (BHCl)₂ adsorbed at the interface and zinc chloride in the aqueous solution shown in step (2) is the rate-determining step. Some parameters of the rate equations were estimated.