Efektivitas Waktu Adsorpsi Dan Desorpsi Menggunakan Membran Kitosan Pada Proses Hidrometalurgi Terhadap Konsentrasi Au

Manik, Natalia Angelica Br (2023) Efektivitas Waktu Adsorpsi Dan Desorpsi Menggunakan Membran Kitosan Pada Proses Hidrometalurgi Terhadap Konsentrasi Au. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Emas merupakan salah satu logam mulia dimana sering digunakan di berbagai bidang. Ekstraksi emas dilakukan untuk mendapatkan kembali emas murni. Proses ekstraksi emas dibagi menjadi dua, yaitu leaching dan separation. Pada tahap separation terdiri dari adsorpsi dan desorpsi. Larutan yang sering digunakan adalah larutan sianida. Begitu pula dengan tahap separation, dimana karbon aktif yang sering digunakan sebagai media separation menggunakan sianida sebagai reagennya. Emisi yang ditimbulkan pada proses ini kurang ramah lingkungan. Oleh sebab itu, perlu menggunakan alternatif lain yang lebih ramah lingkungan. Metode ini sering disebut dengan biosorpsi. Dalam prosesnya dilakukan beberapa pengujian terhadap sampel dan media, seperti uji ICP-OES, uji SEM-EDX, uji UV- Vis, uji XRD, dan uji FTIR. Adapun penelitian ini dilakukan untuk menganalisis efektivitas pengaruh dari parameter waktu adsorpsi dan desorpsi terhadap hasil recovery. Proses adosorpsi dilakukan dengan pH 1,25 dan kecepatan agitasi 200 rpm. Variasi waktu yang digunakan pada proses adsorpsi adalah 4, 6, dan 8 jam. Selanjutnya, pada proses desorpsi variasi waktu yang digunakan adalah 12, 16, dan 20 jam. Ore yang digunakan pada penelitian ini berasal dari Gorontalo, Indonesia. Ore diuji dengan XRD dan EDX untuk mengetahui kandungannya. Pengecilan ukuran ore diperlukan untuk dapat digunakan pada proses leaching. Diawali dengan pretreatment dan acid baking, mineral emas akan di leaching menggunakan aqua regia. Larutan leaching diuji ICP-OES dan UV-Vis untuk mengetahui konsentrasi emas. Media yang digunakan pada proses adsorpsi dan desorpsi adalah membran COS/PVA dan diuji dengan FTIR. Larutan sisa adsorpsi desorpsi akan diuji dengan UV-Vis dan membran diuji FTIR dan SEM-EDX Mapping. Kemampuan adsorpsi paling baik adalah pada variasi 8 jam sebesar 222,17 ppm dan yang paling rendah adalah variasi 4 jam sebesar 184,81 ppm. Pada proses desorpsi dilihat dari hasil uji UV-Vis, hasil paling baik diperoleh dari variasi waktu adsorpsi 8 jam dan variasi waktu desorpsi 20 jam.
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Gold is one of the precious metals which is often used in various fields. Gold extraction is carried out to recover pure gold. The gold extraction process is divided into two, namely leaching and separation. The separation stage consists of adsorption and desorption. In the leaching stage, gold is dissolved in an acidic solution. The solution that is often used is cyanide solution. Similarly, the separation stage, where activated carbon is often used as a medium for the absorption and release of gold metal ions, uses cyanide as a reagent. The emissions generated in this process are less environmentally friendly. Therefore, it is necessary to use other alternatives such as using aqua regia and chitosan membranes. This method is often called biosorption. In the process, several tests were carried out on samples and media, such as ICP- OES test, SEM-EDX test, UV-Vis test, XRD test, and FTIR test. This study was conducted to analyse the effectiveness of the effect of adsorption and desorption time parameters on the recovery results. The adsorption process was carried out with a pH of 1.25 and an agitation speed of 200 rpm. The time variations used in the adsorption process were 4, 6, and 8 hours. Furthermore, in the desorption process the time variations used were 12, 16, and 20 hours. The ore used in this study came from Gorontalo, North Sulawesi. Ore was tested with XRD and EDX to determine its content. Ore size reduction is required to be used in the leaching process. Starting with pretreatment and acid baking, gold minerals will be leached using aqua regia. The leaching solution was tested by ICP-OES and UV-Vis to determine the gold concentration. The media used in the adsorption process is COS/PVA membrane and tested by FTIR. The remaining adsorption solution will be tested with UV-Vis and the membrane is tested with FTIR and SEM-EDX Mapping. In the desorption process, the solution was tested with UV-Vis and the membrane was tested with FTIR and SEM-EDX Mapping. The best adsorption ability is in the 8-hour variation of 222.17 ppm and the lowest is the 4-hour variation of 184.81 ppm. In the desorption process seen from the UV-Vis test results, the best results were obtained from the 8- hour adsorption time variation and the 20-hour desorption time variation.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Adsorpsi, Desorpsi, Emas, Kitosan, Waktu, Adsorption, Desorption, Gold, Chitosan, Time
Subjects:	Q Science > QD Chemistry > QD63 Extraction T Technology > TN Mining engineering. Metallurgy T Technology > TN Mining engineering. Metallurgy > TN688 Hydrometallurgy
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Natalia Angelica Br Manik
Date Deposited:	02 Aug 2023 20:44
Last Modified:	02 Aug 2023 20:44
URI:	http://repository.its.ac.id/id/eprint/99787

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