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All Journal Bima Abdi: Jurnal Pengabdian Masyarakat Hexagon
Syamsul Bahtiar
Universitas Teknologi Sumbawa
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Languange, Linguistic, Communication & Media Other

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Journal : Hexagon

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STUDI TEORITIS MATERIAL KATODA BATERAI ION LITIUM LiFePO4 BERDASARKAN KALKULASI TEORI FUNGSIONAL KERAPATAN Lalu Suhaimi; Syamsul Bahtiar; Muhammad Hilmy Alfaruqi
Hexagon Jurnal Teknik dan Sains Vol 1 No 2 (2020): HEXAGON - Edisi 2
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (430.27 KB) | DOI: 10.36761/hexagon.v1i2.617

Abstract

To fully utilize the intermittent renewable energy resources, energy storage applications such as lithium-ion batteries (LIBs) become very critical. Among LIBs components, cathode part is very important. LiFePO4 material is among the cathode material which has gained significant attention owing to its environmentally friendly and low-cost features compared to Co- or Ni-based cathodes. In this study, we present a theoretical investigation of LiFePO4 material using density functional theory calculations. We optimized LiFePO4 as well as FePO4 structures. Li ion intercalation potential into the structure was also calculated. In addition, the electronic structure of the material was also studied. The present study may provide an insight for further investigation of cathode materials for LIB applications.
SINTESIS MANGANESE FERRITE DENGAN METODE MECHANICAL ALLOYING DARI BIJIH MANGAN ALAM syamsul bahtiar; Imam Wierawansyah Eltara; Fauzi Widyawati; Syamsul Hidayat
Hexagon Jurnal Teknik dan Sains Vol 3 No 1 (2022): HEXAGON - Edisi 5
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (307.75 KB) | DOI: 10.36761/hexagon.v3i1.1345

Abstract

One of the largest natural resources of manganese ore in Indonesia is located in the Regency of Sumbawa Besar and has high manganese content. Manganese ore can be used to form manganese ferrite compounds. The synthesis of manganese ferrite (MnFe2O3) consists of an alloy of manganese ore (MnO2) and hematite (Fe2O3) obtained from mill scale steel production waste. The two particles are then combined by the mechanical alloying method. Manganese ore is first calcined at temperature variations of 400oC, 500oC, and 600oC. The mechanical alloying process of manganese and hematite ore by varying the amount of manganese ore 1: 1, 1: 2, 1: 3, 1: 4. Furthermore, the mixture of particles was calcined at a temperature of 1100oC for 3 hours to obtain homogeneous manganese ferrite. Initial XRD characterization obtained manganese ore in the form of pyrochroite (Mn(OH)2) and after calcination at a temperature of 500oC pyrolusite (MnO2) was formed. The final results of XRD and XRF characterization showed that the addition of MnO2 to Fe2O3 produced manganese ferrite bixbite (MnFe2O3) with a formation intensity of 70%. Dominant MnFeO3 phase at a 4: 1 ratio. The more MnO2 added to Fe2O3, the more manganese ferrite bixbite phases are formed.
Pelindian Bijih Emas Menggunakan Natrium Tisulfat 1 M dan Hidrogen Peroksida 30% : Pelindian Bijih Emas Menggunakan Natrium Tisulfat 1 M dan Hidrogen Peroksida 30% syamsul bahtiar
Hexagon Vol 5 No 1 (2024): HEXAGON - Edisi 9
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i1.3220

Abstract

One of the minerals that has high economic value, so that this mineral is often exploited on a large scale, especially in West Sumbawa Regency, is the metallic gold mineral (Au). In general, the gold leaching processuses cyanidation and amalgamation methods, but these two methods have a high degree of toxicity to theenvironment. One alternative method of leaching gold ore is using sodium thiosulfate. The use of sodiumthiosulphate is considered very ef ective, due to high gold recovery, low risk to the environment, faster dissolution of gold compared to cyanide and the reagent used is also quite economical. Leaching was carriedout using 200 mesh size of gold ore taken at Pekirum Village with sodium thiosulphate as a reagent andhydrogen peroxide as an oxidizing agent. In this study, the leaching process was carried out using aconcentration of 1 M sodium thiosulphate, 30% H?O? concentration, 6 hours of leaching time and a temperatureof 60°C. The characterization results using AAS showed that the percentage of gold recovery using sodiumthiosulfate and H?O?
PELINDIAN BIJIH EMAS MENGGUNAKAN TIOSULFAT DENGAN PERBANDINGAN RASIO PADAT-CAIR 1:20 PADA TEMPERATUR 90? PELINDIAN BIJIH EMAS MENGGUNAKAN TIOSULFAT DENGAN PERBANDINGAN RASIO PADAT-CAIR 1:20 PADA TEMPERATUR 90? syamsul bahtiar; Nuryosi Ismiana
Hexagon Vol 4 No 2 (2023): HEXAGON - Edisi 8
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v4i2.3222

Abstract

Leaching of gold ore using sodium thiosulfate reagent has been successfully carried out. The gold ore used in this study is gold ore from the Pakirum region, West Sumbawa District, West Nusa Tenggara Province. The use of thiosulfate reagent in this gold separation process is due to its very low toxicity level, can extract various types of ores, and provides a high recovery rate and very fast kinetics compared to cyanide. In this study, the leaching process was carried out using a solid-to-liquid ratio of 1:20 at 90? with a particle size of 200 mesh, using thiosulfate reagent concentration of 0.6M with the help of 30% H?O? oxidizing agent. Gold content testing in this study was carried out using the AAS (Atomic Absobtion Spektrophotometer) test, because AAS has a fairly good level of accuracy and precision. The result of this study indicate that the highest gold recovery is 98.27% in leaching time of 6 hours. While the lowest gold yield was 65.51% at the 2 hours leaching time.
ANALISIS PENGARUH KONSENTRASI SIANIDA DAN RASIO PADAT CAIR PADA PROSES PELINDIAN EMAS DARI BIJIH EMAS DESA MOKONG Emsal Yanuar; Anggina Kalara; Kholida Tul Khairy; Syamsul Bahtiar; Fauzi Widyawati
Hexagon Vol 7 No 1 (2026): EDISI 11
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v7i1.7176

Abstract

Emas merupakan logam mulia bernilai ekonomi tinggi yang dimanfaatkan secara luas dalam berbagai bidang, seperti perhiasan, elektronik, kesehatan, dan teknologi. Peningkatan produksi emas di Indonesia selama sepuluh tahun terakhir mendorong aktivitas eksploitasi di berbagai daerah, termasuk Desa Mokong, Kecamatan Moyo Hulu. Pengolahan emas di wilayah ini umumnya masih menggunakan metode amalgamasi yang memiliki tingkat toksisitas tinggi dan efisiensi ekstraksi yang rendah, sehingga diperlukan metode alternatif yang lebih efektif, seperti sianidasi. Penelitian ini bertujuan untuk menganalisis pengaruh konsentrasi natrium sianida (NaCN), rasio padat–cair, dan waktu pelindian terhadap persen ekstraksi emas. Variasi konsentrasi NaCN yang digunakan adalah 250, 500, dan 750 ppm dengan rasio padat–cair 1:10, 1:15, dan 1:20 serta waktu pelindian 0,5; 6; 12; 24; dan 48 jam. Hasil penelitian menunjukkan bahwa peningkatan konsentrasi NaCN dan rasio padat–cair secara signifikan meningkatkan persen ekstraksi emas. Kondisi optimum diperoleh pada konsentrasi NaCN 750 ppm dengan rasio padat–cair 1:20 selama 48 jam, menghasilkan persen ekstraksi emas sebesar 91%. Hasil penelitian ini diharapkan dapat menjadi dasar pengembangan teknologi pengolahan emas yang lebih efektif dan berkelanjutan, khususnya bagi pertambangan emas skala kecil.
Co-Authors Anggina Kalara Fauzi Widyawati I Putu Widiantara Imam Wierawansyah Eltara Kholida Tul Khairy Muhammad Hilmy Alfaruqi Nuryosi Ismiana Rita Desiasni Syamsul Hidayat Yanuar, Emsal