Abstract
This research aims to determine the percent recovery of gold (Au) and silver (Ag) in the electronic waste such as CD-RW and determine the purity of gold and silver metals in the electronic waste such as CD-RW that through multilevel precipitation process. The first step was the optimization of the concentration of thiourea and time dissolution of gold and silver in the sample. The concentration of thiourea and the time dissolution optimum obtained from conentration of gold and silver maximum. By The percent recovery of gold and silver are determined by comparing the concentration of gold and silver between in the solution sample and in the sample without dissolution that be analyzed by XRF. The scond step was the multilevel precipitation process and calcination. Precipitation and calcination of the filtrat was dissolution results in the optimum condition. Reagent used was a solution of hydrochloric acid and potassium carbonate. The precipitation gold and silver produced from the precipitation of dissolution again and then be analyzed by atomic absorption spectrophotometry. The purity was determined by comparing the weight of gold and silver between in the precipitate and in the solution. The results of this research showed that the percent recovery of the silver in the CD-RW through the process dissolution with thiourea 10 g/L and 4 hours soaking time were 21.09 %. The purity silver preipitate were 0.15 %. The percent recovery and the purity of gold can not be determined because the gold contained in the sample were not detected or below the limit of detection equipment. Keywords: recovery, gold, silver, electronic waste
Highlights
This research aims to determine the percent recovery of gold (Au) and silver (Ag) in the electronic waste such as compact disk (CD)-RW and determine the purity of gold and silver metals in the electronic waste such as CD-RW that through multilevel precipitation process
The first step was the optimization of the concentration of thiourea and time dissolution
the time dissolution optimum obtained from conentration of gold and silver maximum
Summary
Subjek penelitian ini adalah limbah elektronik berupa limbah CD-RW. Objek dalam penelitian ini adalah persen recovery dan tingkat kemurnian emas (Au) dan perak (Ag) dari limbah CD-RW. Optimasi konsentrasi tiourea dilakukan dengan langkah sebagai berikut: sebanyak satu CD-RW yang sudah dipotong ditimbang kemudian dimasukkan ke dalam gelas beker ukuran 100 mL. Berdasarkan hasil analisis tersebut diketahui filtrat yang memiliki konsentrasi ion Ag dan Au tertinggi sehingga dapat diketahui konsentrasi optimum tiourea untuk proses pelarutan logam Au dan Ag dalam CD-RW. Berdasarkan hasil analisis tersebut diketahui filtrat yang memiliki konsentrasi ion Ag dan Au tertinggi sehingga dapat diketahui waktu pelarutan logam perak (Ag) optimum yaitu 4 jam. Pengendapan perak dan emas dilakukan dengan langkah sebagai berikut: sebanyak satu gram lapisan logam dari CD-RW yang telah diambil dengan alat crusher dilarutkan dalam tiourea (proses pelindian) dengan konsentrasi tiourea optimum yaitu 10 g/L dan waktu pelindian optimum yaitu 4 jam.
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