Study of the Gold Ekstraction Using Tetra N-Butil Ammonium Chloride-Chloroform = Studi Ekstraksi Emas Menggunakan Tetra n-Butil Amonium Klorida-Kloroform.

The existence of the AuC14" ion in the solution as the function of pH before performing the extraction of gold in the system of tetra N-butilamonium chloride (TBACI) -chloroform has been studied. The experimental data showed that AuC14" 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 Koz(extraction constant) was 5.07x1e Key words: Extraction, extraction efficiency, extraction constan