Siddieq, Mohammad Daffa Rizqi (2025) Analisis Pengaruh Reagen Dan Temperatur Leaching Emas Dan Variasi Ketebalan Membran Nano Chitosan Oligosaccharide Dalam Proses Biosorpsi Emas Dari Bijih Berkonsentrasi Rendah. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Ekstraksi emas secara ramah lingkungan dari bijih dengan konsentrasi rendah telah menarik perhatian. Biosorpsi organik menggunakan nano kitosan oligosakarida (nano COS) telah dikembangkan untuk proses hidrometalurgi ramah lingkungan dalam ekstraksi emas cair dari bijih dengan konsentrasi rendah. Bijih emas dari Gorontalo, Indonesia, memiliki konsentrasi emas 0,38 wt% saat diterima, dan meningkat menjadi 3,73 wt% setelah diradiasi menggunakan gelombang mikro. Perangkat lunak FactSage mengungkapkan parameter pelindian optimal menggunakan Aqua Regia 4M pada suhu 100°C dengan pengadukan 140 rpm selama 4 jam. Berbagai membran biosorpsi nano COS dengan ketebalan 1 mm, 2 mm, dan 3 mm disiapkan untuk adsorpsi emas dari larutan pelindian. Proses adsorpsi dilakukan pada suhu 45°C dengan pH 1,75 menggunakan kecepatan pengadukan 200 rpm selama 60-300 menit dengan interval 60 menit. Selanjutnya, proses desorpsi dilakukan dalam larutan EDTA 0,1 M pada 200 rpm dan suhu 40°C selama 6 jam. Semua larutan hasil adsorpsi dianalisis menggunakan AAS dan UV-Vis, sedangkan membran nano COS dianalisis menggunakan FTIR. Data dari proses adsorpsi dibandingkan dengan model isoterm (Langmuir, Freundlich, Temkin, dan Dubnin-Radushkevich), dan fenomena kinetika biosorpsi mengikuti model kinetika orde dua semu, orde satu semu, serta difusi intrapartikel. Hasil penelitian menunjukkan ketebalan membran nano COS optimal adalah 2 mm dengan kemampuan adsorpsi sebesar 1,74 mg/L dari konsentrasi awal 5,75 mg/L untuk menghilangkan AuCl4-.
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Green extraction of gold from low concentration of ore has become to attract attention. Organic biosorption from nano chitosan oligosaccharide (nano COS) has been developed to green hydrometallurgical process for gold liquid extraction from ore with low concentration. Leaching process was conducted by combination FactSage software and experimental with focus on parameter concentration and temperature during leaching. In addition, study about isotherm and kinetic
adsorption was conducted using effect of thickness membrane nano COS and various leaching solution. Ore gold from Gorontalo, Indonesia was depicted 0.38 wt% of gold concentration as received and increase become 3.73 wt% after microwave irradiated prior to leaching process. FactSage was revealed the optimum of leaching parameter in Aqua Regia 4M at 100°C using 140 rpm agitation for 4 hours. Various thickness membrane biosorption nano COS was prepared by 1mm, 2mm and 3mm for gold adsorption from leaching solution. Adsorption was carried out in condition 45°C at pH 1.75 and using 200 rpm for 60-300 minutes within interval of 60 minutes. Furthermore, desorption was conducted in 0.1 M EDTA using 200 rpm at 40°C for 6 hours. All, solution from adsorption were investigated using AAS and UV-Vis. While, the membrane nano COS was investigated by FTIR. Datas from adsorption process were matched to Isotherms model (Langmuir, Freundlich, Temkin, and Dubnin-Radushkevich) and the phenomena of biosorption kinetics was following pseudo second order, pseudo first order kinetics, and intraparticle diffusion. The results was depicted of optimum thickness 2mm membrane nono COS with adsorbing capability of 1.74 mg/L from 5.75 mg/L initial concentrationremoval of AuCl4-
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| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Adsorpsi, Chitosan, Emas, Leaching, Adsorption, Chitosan, Gold, Leaching |
| Subjects: | T Technology > TN Mining engineering. Metallurgy > TN688 Hydrometallurgy |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 27101-(S2) Master Thesis |
| Depositing User: | Mohammad Daffa Rizqi Siddieq |
| Date Deposited: | 04 Feb 2025 02:37 |
| Last Modified: | 04 Feb 2025 02:37 |
| URI: | http://repository.its.ac.id/id/eprint/117481 |
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