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All Journal Jurnal Ilmu Lingkungan Seminar Nasional Teknik Kimia Kejuangan Journal Of Chemical Process Engineering (JCPE) Jurnal Inovasi Hasil Pengabdian Masyarakat (JIPEMAS) REACTOR : Journal of Research On Chemistry And Engineering Abdimas Altruis: Jurnal Pengabdian Kepada Masyarakat MINERAL Metalurgi Jurnal Teknologi Kimia Mineral Journal of Community Services in Sustainability Bulletin of Chemical Reaction Engineering & Catalysis Journal Of Chemical Process Engineering Jurnal Rekayasa Proses Industrial Innovation
Gyan Prameswara
Program Studi Teknik Kimia Mineral, Politeknik ATI Makassar
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Social Sciences Other

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Efek Pre-Roasting Terhadap Parameter Kinetika Leaching Cr dari Limonit Prameswara, Gyan; Ulfah , Andi Nurfaadilah; Supriadi , Cipta Panghegar; Trisnawati, Iga; Petrus, Himawan Tri Bayu Murti
REACTOR: Journal of Research on Chemistry and Engineering Vol. 4 No. 2 (2023)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v4i2.97

Abstract

Hydrometallurgical processes such as leaching of limonite ore to extract valuable metals including Ni and Co are often non-selective, including other metals in the leachate product. The leaching behavior of Cr from the chromite mineral contained in limonite ore is of concern due to the high Cr content of the leachate effluent. The pre-roasted process is frequently used to pre-treat limonite to increase the precious metal content. This study aims to determine the leaching behavior of Cr and the effect of pre-roasting on its kinetic parameters. The pre-roasting process was carried out at 280 and 610 oC for 4 hours. Observation of Cr leaching behavior was carried out in the leaching temperature range of 30-90 oC for 0-120 minutes using sulfuric acid solvent. The highest Cr recovery was achieved in pre-roasted ore leaching at 610 oC with leaching operating conditions of 2 M sulfuric acid, solid-liquid ratio of 5 g/50 mL, 200 rpm, for 120 minutes, at a leaching temperature of 90 oC, under these conditions Cr recovery reached 53.16%. The higher the roasting temperature, the lower the activation energy required for the leaching process. Cr leaching from raw and pre-roasted ore is controlled by the diffusion process through the ash layer with activation energies (EA) of 21.41, 18.64, and 14.71 kJ/mol for raw ore, pre-roasted ore 280 oC, and pre roasted ore 610 oC, respectively. The comparison of kinetics data from several roasting products for atmospheric leaching feeds will provide industry with information to integrated pyro-hydrometallurgical process to increase Cr production from laterite.
Pemanfaatan limbah sekam padi hasil penggilingan padi dengan menggunakan teknologi kompor reaktor gasifikasi Dahlan, Masbin; Prameswara, Gyan
Jurnal Inovasi Hasil Pengabdian Masyarakat (JIPEMAS) Vol 6 No 3 (2023)
Publisher : University of Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/jipemas.v6i3.19501

Abstract

Limbah sekam padi dari penggilingan gabah dapat menimbulkan masalah lingkungan karena sering digunakan hanya sebagai pakan ternak, disimpan atau dibuang langsung. Di sisi lain, limbah sekam padi dapat dimanfaatkan sebagai salah satu bahan bakar reaktor gasifikasi. Kegiatan pengabdian masyarakat ini bertujuan agar dapat memberikan alternatif solusi untuk mengatasi permasalahan tersebut dengan mengubah limbah sekam padi menjadi bahan bakar yang bermanfaat dan bernilai ekonomis. Kegiatan ini menyasar pemilik, pekerja, dan masyarakat sekitar PT Talasalapang Agro, Desa Gangang Baku, Dusun Bilampang Tanah Karaeng, Manuju Kab Gowa. Metode yang digunakan pada pengabdian kepada masyarakat ini adalah service learning dimana bertujuan untuk meningkatkan pengetahuan dan pemahaman Masyarakat terhadap pemanfaatan limbah sekam padi menjadi bahan bakar reactor gasifikasi. Limbah sekam padi dimanfaatkan dengan metode gasifikasi menggunakan reaktor model aliran atas (Updraft). Metode kegiatan ini adalah berinteraksi dengan staf dan karyawan serta memberikan pengetahuan tentang pembuatan reaktor gasifikasi dan manfaat yang diperoleh dari sekam padi tersebut. Hasil yang di harapkan dapat membuat staf dan karyawan memahami pentingnya penggunaan sekam padi sebagai energi alternatif dan cara membuat reaktor gasifikasi. Didapatkan pula peningkatan pemahaman sebesar 100% oleh peserta PKM tentang pemanfaatan limbah sekam padi khususnya untuk bahan bakar reaktor gasifikasi. Mitra mengharapkan keberlanjutan program ini untuk pengembangan reaktor gasifikasi skala besar.
Pengaruh Pre-roasting Terhadap Kinetika Leaching Fe dari Laterite Tipe Limonite: Effect Of Pre-roasting On Fe Leaching Kinetics from Limonite-Type Laterite Prameswara, Gyan
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.4567

Abstract

Extraction of valuable metals from laterite is intensified. The scarcity of sulfide sources containing high Ni and the use of pyrometallurgical processes with high capital costs are important reasons to initiate extraction of valuable metals from oxide minerals such as laterite and hydrometallurgical processes such as leaching. In this study, the effect of pre-roasting of limonite type laterite on Fe leaching kinetics parameters was observed. Roasting was carried out at 280 °C and 610 °C to transform the geotite phase into hematite and dehydroxylate Mg-Si associated minerals. Roasting was carried out for 4 hours in a muffle furnace. Non-roasted and roasted ore were then leached at a temperature range of 30-90 °C at a time variation of 0 to 240 minutes using sulfuric acid at a concentration of 2M, S/L ratio of 10 g/100 mL, and rotating speed of 200 rpm. Roasted ore (280 °C) showed better leaching performance than non-roasted ore while increasing the roasting temperature to 610 °C did not provide a significant increase in Fe recovery. Kinetic parameters such as activation energy (EA) and frequency factor were also reduced by using roasted ore. An EA value of 31.66 kJ/mol was obtained in the leaching process using 280 °C roasted ore. The leaching process is confirmed to be controlled by diffusion through the product layer with the following kinetic equation kt=31.59 exp (-31.66/(RT))t=1-2/3X-(1-X)^(2/3).
Kinetika Leaching Ni dan Fe dari Bijih Laterit Tipe Limonite Morowali Prameswara, Gyan; Tyassena, Flaviana Yohanala Prista; Pasaribu, Monita; Febryanzha , Indhyca Novitha
REACTOR: Journal of Research on Chemistry and Engineering Vol. 3 No. 2 (2022)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v3i2.57

Abstract

Nickel (Ni) deposits are depleting, while demand for the metal is increasing. To address this problem, valuable metals such as Ni and Fe can be extracted from secondary sources such as limonite-type laterite ores. The goal of this study was to investigate the influence of leaching temperature on Ni and Fe recovery, as well as the best kinetic model to represent the leaching process of these metals. Temperature has a considerable impact on the leaching process of Ni and Fe. Increasing the temperature from 30 to 90 oC can increase the recovery of Ni by 50% and Fe by 70 %. Ni and Fe recoveries were highest at 93.21 % and 95 %, respectively. Kinetic analysis of the two metals' leaching processes was also performed. It was discovered that the diffusion process controls Ni leaching, which can be represented using the Zhuravlev kinetic model, whereas chemical reactions on the surface of the unreacted core controls Fe leaching. The activation energies for leaching Ni and Fe are 36.53 and 40.32 kJ/mol, respectively. 1930 exp ((-36.53 kJ/mol)/(R.T))t=[(1-X)-1/3)-1]2 is the kinetic equation for Ni leaching. The kinetic equation for Fe leaching is 3903 exp ((- 40.32 kJ/mol)/(R.T)t=1-(1 X)1/3.
Metal Recovery and Sulphur Removal in Laterite Residue Roasting Process Gyan Prameswara; Dwi Asriani Putri; Syardah Ugra Al Adawiyah
Industrial Innovation Vol. 2 No. 1 (2025): Industrial Innovation
Publisher : Politeknik ATK Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58533/578n0w52

Abstract

This study investigates the effect of roasting temperature and duration on sulphur removal and metal recovery from laterite residue obtained through atmospheric leaching of limonitic ore. The residue, characterized by high sulphur (7.43 wt.%) and iron (21.38 wt.%) content, was subjected to roasting at temperatures ranging from 500 °C to 800 °C for up to 120 minutes. XRD analysis revealed the presence of fayalite, hematite, enstatite, and jarosite, indicating stable sulphur-bearing and silicate phases. Results showed that complete sulphur removal (100%) was achieved at ≥750 °C within 30 minutes, while only partial removal (~45%) occurred at 500 °C. Iron and manganese recovery increased with temperature, reaching 28.46% and 26.50%, respectively, at 750 °C for 90 minutes. The improved recovery was attributed to the thermal decomposition of sulphates and oxidation of metal species to more leachable oxides. Roasting at 750 °C for 90 minutes was identified as the optimum condition, balancing sulphur elimination, metal recovery, and energy efficiency.
Co-Authors Agus Prasetya Agus, Tri Gustiany Ahmad Faqih Suherman Andi Arninda Andi Nurfaadilah Ulfah Assagaf, Iman Pradana A. Cipta Panghegar Supriadi Dwi Asriani Putri Febryanzha , Indhyca Novitha Flaviana Yohanala Prista Tyassena Frabowo Prasetia Gusmadi, Muh. Irfan Wijaya Handini, Tri Harry Supriadi Herry Purnomo Himawan Tri Bayu Murti Petrus Husnul Hatimah, Husnul Idi Amin Idi Amin, Idi Indhyca Novitha Febryanzha Islamia, Nurul Jamaluddin Jamaluddin Leying, Fahrilla Trisya Masbin Dahlan Monita Pasaribu Muhammad Azwar Nur, Muhammad Aslam Panut Mulyono Perkasa, Pandu Dwi Cahya Rahim, Herlina Raihan, Ahmad Zaki Rezki Amalia Ruslan Syafri Sariwahyuni Setyorini, Dwi Sri Diana Suherman, Ahmad Faqih Sujoto, Vincent Sutresno Hadi Sukriya Buwardah Supriadi , Cipta Panghegar Suyanti Suyanti Syardah Ugra Al Adawiyah Trisnawati, Iga Ulfah , Andi Nurfaadilah Widi Astuti