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All Journal Jurnal Migasian Jurnal Polimesin
Samuel Armawan Sandi
Universitas Jayabaya
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering

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Pemanfaatan Arang Aktif Ampas Kopi Arabika (Coffea arabica) dengan Aktivator Asam Klorida (HCl) dan Asam Fosfat (H3PO4) Sebagai Adsorben Logam Kromin (Cr) pada Limbah Tekstil Dody Guntama; Mubarokah Nuriani Dewi; Lukman Nulhakim; Samuel Armawan Sandi; Audina Trisnaeni; Ayu Lintang
Jurnal Migasian Vol 7 No 1 (2023): Jurnal Migasian
Publisher : LPPM Institut Teknologi Petroleum Balongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36601/jm.v7i1.226

Abstract

Activated charcoal of Arabica coffee grounds with different activators (HCl and H3PO4) has the potential as an adsorber for chromium in artificial textile waste. Coffee grounds can be used as raw material for activated charcoal because it has a fairly high carbon content. Waste is made using Chromic Acid powder with a ratio of 1:10 to Aquadest. The concentrations of HCl and H3PO4 activators used were respectively 0.1 N. Activated charcoal is made by drying coffee grounds for 24 hours and the carbonization process is carried out in a furnace at a temperature of 200 oC. Charcoal formed is activated with HCl and 0.1 N H3PO4 activator for 48 hours. The characteristics tested were ash content, water content, absorption of iodine, and absorption of chromium solution. The chromium absorption test used AAS (Atomic Absorption Spectrophotometry) and SEM-EDX (Scanning Electron Microscope - Energy Dispersive X-Ray) tests. The results showed that Arabica coffee grounds had the potential as chromium adsorbent and the best activator used was HCl with the characteristics of activated charcoal as follows: water content of 8.1175%, ash content of 4.5981%, absorption of iodine of 401.7964 mg /g and the absorption capacity of chromium solution is 800 mg/g.
Effects of feed particle size distribution and chemical properties on roller press performance and comminution efficiency at plants 7 and 8 of PT Indocement Tunggal Prakarsa, Tbk Mubarokah Nuriaini Dewi; Dwi Qurningsih; Samuel Armawan Sandi; Dody Guntama; Lukman Nulhakim; Lubena Lubena; Irma Agustin
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7423

Abstract

Roller press is a comminution machine that works based on contact force and compression force at high pressure. Several operational constraints, such as hydraulic pressure, can cause the roller press feed to malfunction, leading to performance degradation. This study aims to analyze the effect of material feed characteristics on roller press performance in the finish mill unit of PT. Indocement Tunggal Prakarsa, Tbk. The methods used include Particle Size Distribution (PSD) analysis, free lime test, tricalcium silicate (C3S), and Work Index (WI) testing on samples from clinker plant 7 (P7) and plant 8 (P8). Roller press operational parameters hydraulic pressure, and grinding pressure, were analyzed to spread the impact of particle size distribution on comminution efficiency. The results showed that optimal roller press performance was achieved when the PSD material was evenly distributed with f80 of 12.98 mm and a reduction ratio of 8.16. The specific grinding power required was 5.33 N/mm² with a power consumption of 6.92 kWh/t. In addition, clinker with C3S content of 62.53% and free lime of 1.25% had better grind-ability, with WI value of 12.90 kWh/t, which contributed to a comminution efficiency of 12.50%. The conclusion of this study is that the particle size distribution of feed material greatly affects the operational parameters of roller press and energy efficiency. Material with more even size distribution and better grind-ability results in more effective comminution performance and lower energy consumption, which has implications for improving the efficiency of grinding process in the cement industry.
Co-Authors Audina Trisnaeni Ayu Lintang Dody Guntama Dody Guntama Dwi Qurningsih Irma Agustin Lubena Lubena, Lubena Lukman Nulhakim Mubarokah Nuriaini Dewi