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All Journal Sinergitas Multidisiplin Ilmu Pengetahuan dan Teknologi (SMIPT) Cassowary Jurnal Dedikasi Petrogas : Journal of Energy and Technology Jurnal Multidisiplin Indonesia Paulus Chem Engineering Journal
Sarungallo, Rosalia Sira
Program Studi Teknik Kimia, Universitas Kristen Indonesia Paulus
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Journal : cassowary

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Optimasi komposisi briket ramah lingkungan dari limbah batubara sub-bituminus dan karbon rumput laut untuk mengurangi emisi Sarungallo, Rosalia Sira; Djonny, Maxie; Octovian Dominggus, Reinaldy; Bulo, Lyse; Manukrante, Secwin Sello
Cassowary Vol 8 No 1 (2025): Januari
Publisher : Program Pascasarjana Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/casssowary.cs.v8.i1.341

Abstract

ABSTRACT: This study investigates the development of environmentally friendly briquettes as a sustainable alternative fuel. Production involved utilizing sub-bituminous coal waste and carbon derived from the carbonization of seaweed. The primary objective of this research was to optimize the briquette composition to achieve optimal combustion performance, with a focus on reducing the emissions of harmful combustion byproducts, such as SOx (sulfur oxides), NOx (nitrogen oxides), COx (carbon oxides), and particulate matter. The results indicate that briquettes with a 1:1 ratio of coal to seaweed carbon, carbonized at 300°C (sample 3A1), demonstrate potential as an alternative fuel. The 3A1 briquettes exhibited a calorific value of 4422 cal/g, with SOx and NOx emissions that were 11.11% and 25.00% lower compared to pure coal briquettes. This reduction is attributed to the lower sulfur and nitrogen content in the seaweed, as well as the improved carbon structure stability resulting from the carbonization process at 300°C. The utilization of coal waste and seaweed in the form of briquettes represents a viable approach to mitigating environmental impacts and contributes to the development of clean and sustainable energy.
Optimasi flotasi bijih nikel laterit menggunakan depresan pati singkong karet (Manihot glaziovii) dengan variasi konsentrasi pati dan pH terhadap recovery nikel Rantang, Cornelia Kesia; Almi Lestari, Mirna; Yoretno Y, Putri; Caludia Rony, Putri; Imanuel Tikupadang, Ruberto; Sira Sarungallo, Rosalia
Cassowary Vol 8 No 4 (2025): Oktober
Publisher : Program Pascasarjana Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/casssowary.cs.v8.i4.503

Abstract

ABSTRACT: This research aims to characterize the chemical composition of laterite nickel ore and analyze the effect of variations in the mass of cassava rubber starch depressant (Manihot glaziovii) and the pH of the flotation solution on nickel recovery and the content of gangue minerals (Fe2O3 and SiO2) in the flotation process. The laterite nickel ore used was obtained from Southeast Sulawesi. The research was conducted experimentally in the laboratory with pH variations of 5, 7, and 9 and starch depressant masses of 0, 0.1, 0.3, and 0.5 g. The collector used was sodium oleate, and pine oil was used as a frother. The results showed that the laterite nickel ore used as raw material has typical characteristics of laterite ore with a low Ni content and high gangue content. Variations in the mass of cassava rubber starch depressant and pH affected nickel recovery and the selectivity of separation toward gangue minerals. Under acidic conditions (pH 5), increasing the starch mass up to 0.3 g decreased nickel recovery from 58.26% to 36.75%. At neutral pH (pH 7), a recovery of 69.62% was obtained, while at basic pH (pH 9) and a starch mass of 0.5 g, the highest nickel recovery of 76.61% was achieved. However, the use of cassava rubber starch has not yet shown optimal selectivity in reducing Fe2O3 and SiO2 contents. Research using cassava rubber starch has potential as a natural, economical, and environmentally friendly depressant to improve nickel recovery in the flotation process of laterite nickel ore, although further optimization is still needed to improve selectivity toward gangue minerals.
Co-Authors Agus Manting Almi Lestari, Mirna Apriliani Binasti More Bulo, Lyse Caludia Rony, Putri Cam, Muhammad Apris Dean Octen Romatua Sarumpaet Denny Denny Djonny, Maxie Fransiskus Fransiskus Hermanto Hermanto I Ketut Warsa Imanuel Tikupadang, Ruberto Kordiana Sambara Lengke, Grenatha Lydia Melawaty Lyse Bulo Manukrante, Secwin Sello Megawati, Eka Monde, Junety Neitania Gabriella.T Sule Octovian Dominggus, Reinaldy Parman, Mohammad Zulfikar Rantang, Cornelia Kesia Reinaldy Octavian Dominggus Sepriyana Marisa Useng, Mardayanti Rari Vegatama, Meita Rezki Woren Suryadesprin Mangoting Yenny Meini Sari Yoretno Y, Putri