Study of the Gold Extraction Using Tetra N-Butyl Ammonium Chloride-Chloroform

Yuli Puspito Rini; Agus Kuncaka; Ngatidjo Hadipranoto

doi:10.22146/ijc.21947

Study of the Gold Extraction Using Tetra N-Butyl Ammonium Chloride-Chloroform

https://doi.org/10.22146/ijc.21947

Yuli Puspito Rini⁽¹⁾, Agus Kuncaka^(2*), Ngatidjo Hadipranoto⁽³⁾

(1) Faculty of Education, Lambung Mangkurat University, Banjarmasin
(2) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara PO BOX BLS 21 Yogyakarta 55281
(3) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara PO BOX BLS 21 Yogyakarta 55281
(*) Corresponding Author

Abstract

The existence of the AuCl₄^- ion in the solution as the function of pH before performing the extraction of gold in the system of tetra N-butylammonium chloride (TBACI) -chloroform has been studied. The experimental data showed that AuCl₄^- ion was hydrolyzed at pH 5-10 and, an amorf dark-brown precipitate was appeared at pH 11-14. Amount of gold in the solution at pH 14 before extraction was around 70%. Study of the extraction has been carried out by investigating the influence of pH and TBACI concentration on the extraction efficiency. The experimental result indicated that TBACI was very efficient extractant for the extraction of gold from aqueous halide with the efficiency higher than 99%. The extraction of Gold in the TBACI-chloroform was effective at pH 0-4 with minimum concentration of TBACI 10^-3 M, and the calculated K_ex(extraction constant) was 5.07x10^-⁴.

Keywords

extraction; extraction efficiency; extraction constant

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DOI: https://doi.org/10.22146/ijc.21947