Ahmad Maksum

Scopus Publications

Analysis of The Influence of Pyrolysis Temperature and Biomass Weight on The Yield and Quality of Bio-Oil from Rice Husk
Adi Syuriadi, Gun Gun Ramdlan Gunadi, Ahmad Maksum, Fadillah Ramadhan
Journal of Physics Conference Series, 2026
Energy demand in Indonesia is increasing with the growing population, but it is not matched by adequate energy availability. The use of fossil energy causes negative impacts such as global warming and pollution. Therefore, environmentally friendly alternative energy sources are needed. Rice husk biomass, as one of the abundant renewable energy sources in Indonesia, has great potential as a raw material for alternative energy. This study aims to convert rice husk biomass into bio-oil using the pyrolysis method and analyze the resulting bio-oil. The methods used are experimental and comparative. At 500°C, the bio-oil yield is higher compared to 600°C for all biomass weights tested. The average yield at 500°C reached 34.7% for 500 grams, 33.5% for 1000 grams, and 32.7% for 1500 grams. At 600°C, the yield decreased to 31.3% for 500 grams, 32.3% for 1000 grams, and 30.9% for 1500 grams. This decrease indicates that higher temperatures reduce the efficiency of bio-oil production due to secondary reactions such as thermal cracking. The density and viscosity of bio-oil also decreased with increasing pyrolysis temperature. The density at 500°C was 1.389 g/ml, while at 600°C it decreased to 1.334 g/ml. Viscosity dropped from 1.310 cP to 1.229 cP, indicating that the bio-oil became more fluid at higher temperatures.
Rheological observations and modulus of elasticity due to compaction temperature of carbon composites - LLDPE
Agus Edy Pramono, Tatun Hayatun Nufus, Ahmad Maksum, Anissa Puspa Dewi, Yohannes Patrick, Subyakto
Aip Conference Proceedings, 2025
The investigation on the electrical and physical properties of conductive filaments prepared using polymer-carbon composites
Agus Edy Pramono, Yohannes Patrick R., Ahmad Maksum, Dewin Purnama, Tatun Hayatun Nufus, Nanik Indayaningsih
Aip Conference Proceedings, 2024
Novel method for minimizing reactant in the synthesis of sodium silicate solution from mixed-phase quartz-amorphous SIO2
Eni Febriana, Wahyu Mayangsari, Sigit Dwi Yudanto, Eko Sulistiyono, Murni Handayani, Florentinus Firdiyono, Ahmad Maksum, Agus Budi Prasetyo, J.W. Soedarsono
Case Studies in Chemical and Environmental Engineering, 2024
In this research, sodium silicate solution was synthesized by reacting silica from inorganic materials with NaOH. The determination of the amount of NaOH used in the reaction is calculated by considering the quantity of the crystalline (quartz) and amorphous phases of silica contained in the raw material used. Determination of the quantity of quartz and amorphous phases was carried out using a single peak method which is quite simple but is quite close to the actual quantity of the amorphous phase. In the hydrothermal system to synthesize sodium silicate solution from silica with a mixture of quartz and amorphous phases, an optimum dissolving effectiveness value of 98% can be achieved under dissolution conditions in an autoclave heated at a temperature of 250 °C for 6 hours with a silica:aquadest weight ratio of 1:5 and 1 stoichiometric NaOH added to the quartz phase plus 0.5 stoichiometric to the amorphous one. With this calculation method, saving of NaOH solvent can be made which are proportional to the quantity of the amorphous phase involved in the reaction. The amount of NaOH needed to make sodium silicate solution can be saved by a maximum value of 50% when using amorphous materials.
Exploration of rice husk ash as a green corrosion inhibitor immersed in NH4Cl 7.5 % solution
Agus Paul Setiawan Kaban, Johny Wahyuadi Soedarsono, Mochammad Syaiful Anwar, Wahyu Mayangsari, Ahmad Maksum, Aga Ridhova, Rini Riastuti, Dedy Iskandar, Ayende
Heliyon, 2024
The study reports the development of a liquid smoke solution of rice husk ash (RHA) as a green corrosion inhibitor in NH 4 Cl solution in approaching corrosion protection for refinery facilities. The recent utilization of RHA has a partial solution to address the possible chemical to form a filming layer to disconnect bare metal and their environment. This work prepared the RHA solution by condensing the RHA vapor before adding it to various concentrations. The corrosion test of potentiodynamic and electrochemicals intends to discover the inhibitor's corrosion resistance before examining the electronic transition corresponding to the contribution of several functional groups using Ultraviolet Visible (UV-Vis) and Fourier-Transform Infrared Spectroscopy (FTIR). Surface evaluation intends to unveil the nature of the corrosion by utilizing the Scanning Electronic and Atomic Force Microscope. The corrosion test result shows the depression of corrosion rate to 0.120 mmpy with high efficiency beyond 96% in the addition of 7.5 ppm RHA inhibitor. The greater Nyquist semicircle diameter at high concentrations increases the adsorption of the RHA on the surface of C1018. The electronic transition of n–π* and π –π* shows an extensive contribution of C=C, C=O, and –OH based on the UV-Vis and FTIR test. The formation of a complex compound of Fe-(NH 4 Cl-RHA) n blocks the corrosion active sites to reduce the corrosion. This study paves the way for using RHA as an organic compound under NH 4 Cl conditions, such as in a refinery process facility.
Effect of microcarbon particle size and dispersion on the electrical conductivity of LLDPE-carbon composite
A. Zuhri, A. E. Pramono, I. Setyadi, A. Maksum, N. Indayaningsih
Journal of Applied Research and Technology, 2024
This experimental research aimed to develop a conductive polymer composite (CPC) material for electromechanical devices. The composite was made by incorporating conductive micro carbon derived from rice husks into a Linear Low-Density Polyethylene (LLDPE) polymer matrix using hot compaction. Variations of filler composition were used, with carbon loading of 50%, 45%, and 40%, and mesh sizes of #150, #200, and #250. The experimental results showed that particle size variations did not significantly affect composite density, but higher mesh selection improved filler dispersion within the matrix, resulting in higher electrical conductivity values. The optimal conductivity value of 9.43E-04 S/cm was achieved with a micro-carbon composition of 50% loading. However, decreasing micro carbon loading had a more significant impact on reducing electrical conductivity values.
Photocataylitic performance assessment of rGO-AgNPs nanocomposites using urea reductor for methyl orange dye degradation
Nurhayati Indah Ciptasari, Murni Handayani, Afif Akmal Afkauni, Caesart Leonardo Kaharudin, Adhi Dwi Hatmanto, Ahmad Maksum, Rini Riastuti, Johny W. Soedarsono
Aip Conference Proceedings, 2024
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Nurhayati Indah Ciptasari, Murni Handayani, Afif Akmal Afkauni, Caesart Leonardo Kaharudin, Adhi Dwi Hatmanto, Ahmad Maksum, Rini Riastuti, Johny W. Soedarsono; Photocataylitic performance assessment of rGO-AgNPs nanocomposites using urea reductor for methyl orange dye degradation. AIP Conf. Proc. 28 February 2024; 3003 (1): 020093. https://doi.org/10.1063/5.0186402 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAIP Publishing PortfolioAIP Conference Proceedings Search Advanced Search |Citation Search
Double acting liberation of Ni and Co in the pre-treatment process to increase recovery of nickel from low-grade nickel laterite
Eni Febriana, Muhamad Irham Mulyadi, Wahyu Mayangsari, Januar Irawan, Iwan Setiawan, Ahmad Maksum, Florentinus Firdiyono, Soesaptri Oediyani, Agus Budi Prasetyo, Johny W. Soedarsono
Journal of Sustainable Mining, 2024
This study highlights the effectiveness of employing double-acting liberation to release Ni and Co from the complex phases of the low-grade nickel laterite. It includes the addition of concentrated sulphuric acid and NaF as well as the heat treatment prior to roasting and leaching processes to improve the destruction of the complex phases contained. The finding describes that dehydration of iron sulfate and decomposition of the lizardite at a lower temperature, 270°C, were occurred in the pre-treatment process, followed by hematite formation in the roasting process. It subsequently accelerated Ni and Co extraction in the pregnant solution and omitted Fe as the water-insoluble hematite in the residue when the leaching process was employed. The optimum leaching percentages of nickel and cobalt are 71.3% and 98.8%, serially, and were obtained at a roasting temperature of 700°C for 30 minutes with the addition of 3 wt.% sodium fluoride. This research provides essential contributions to the optimization of decomposition process for complex phases of in the low-grade nickel laterite at a lower temperature and to upsurge leaching percentage of Ni and Co by strictly suppressing Fe dissolution.
THE EFFECT OF MIXING METHODS BEFORE THE DECOMPOSITION PROCESS OF FERRONICKEL SLAG
Wahyu Mayangsari, Agus Budi Prasetyo, Eni Febriana, Ahmad Maksum, Rudi Subagja, F Firdiyono, Johny Wahyuadi Soedarsono
Acta Metallurgica Slovaca, 2023
Ferronickel slag is a by-product that was obtained from ferronickel production and contains Si and Mg as the main elements. Decomposition process using alkali could decrease energy consumption to process ferronickel slag by decreasing its melting point. The mixing methods prior to the decomposition process could significantly affect interaction between reactants over the process, therefore it is essential to study. The aim of this study is to determine the effect of mixing methods of ferronickel slag and NaOH prior decomposition process on the chemical composition, phase, and microstructure of decomposed ferronickel slag. Two different mixing methods, physical mixing, and impregnation, followed by roasting process at 350 ℃ for 60 minutes were performed, characterized, and analyzed. Thermodynamic analysis was calculated and shows having a good agreement with the characterization results which formation of sodium silicate, magnesium hydroxide and iron oxide were identified. Distribution of product layer of RI can be determined, while spotty decomposition was clearly identified. The effectiveness of impregnation over physical mixing was investigated.
Pyro-Hydrometallurgy Routes to Recover Silica from Indonesian Ferronickel Slag
Reza M. Ulum, Natalin, Rini Riastuti, Wahyu Mayangsari, Agus B. Prasetyo, Johny W. Soedarsono, Ahmad Maksum
Recycling, 2023
Ferronickel slag is a by-product of nickel smelting that provides an abundant silica source. Based on data, every ton of nickel production is equal to eight tons of ferronickel slag production, increasing without any recycling process. It is essential to create an end-to-end process for nickel production and its by-products because this would be a problem in the future and is relevant for many industrialized countries. This study describes a strategy to process ferronickel slag to produce silica. A pyrometallurgy–hydrometallurgy process and ferronickel slag were used to increase the silica content. The process was conducted through alkali fusion; the ferronickel slag was mixed with sodium carbonate at a temperature of 1000 °C for an hour and continued via leaching, precipitation, and cleaning processes. The leaching process was conducted with four concentrations (4 M, 6 M, 8 M, and 10 M) of sodium hydroxide and three different leaching durations (2 h, 4 h, and 6 h). Using hydrochloric acid (HCl) at pH 2 and deionized (DI) water cleaning, the precipitation process was adopted to synthesize a silica powder with the lowest agglomeration and enhance its purity. Characterization was carried out using X-ray Diffraction (XRD), Scanning Electron Microscopy–Energy-Dispersive Emission (SEM-EDS), X-ray Fluorescence (XRF), and Inductively Coupled Plasma–Optical Emission Spectroscopy (ICP-OES). This study highlighted silica characteristics that indicate high recovery by 85% through alkali fusion, HCl leaching, precipitation, and deionized water cleaning.
Fabrication of high purity silica precipitates from quartz sand toward photovoltaic application
Journal of Ceramic Processing Research, 2023
Insight on Corrosion Prevention of C1018 in 1.0 M Hydrochloric Acid Using Liquid Smoke of Rice Husk Ash: Electrochemical, Surface Analysis, and Deep Learning Studies
Agus Paul Setiawan Kaban, Johny Wahyuadi Soedarsono, Wahyu Mayangsari, Mochammad Syaiful Anwar, Ahmad Maksum, Aga Ridhova, Rini Riastuti
Coatings, 2023
USING THE GOLD BULLION SLAG FROM INDONESIA AS LITHIUM RESOURCES WITH HCL LEACHING METHOD
Nadia Natasha, Ghina Rabbani, Nofrijon Sofyan, Johny Soedarsono, Agus Prasetyo, Ahmad Maksum, Rini Riastuti, Isnanda Nuriskasari
Eastern European Journal of Enterprise Technologies, 2023
Heat Effectiveness Analysis of Knock Down Smoke LCS (Liquid Collection System) Design with a Mixture of Ethylene Glycol and Water as Cooling Media
Faiz Irza Ramadhan, Johny Wahyuadi M. Soedarsono, Rini Riastuti, Ahmad Maksum
Iop Conference Series Earth and Environmental Science, 2022
The Effect of Chimney Size on Knock-Down Pyrolysis Tank Design as Rice Husk Burner Using CFD Simulation
Mohamad Ramadani Rudiatama, Hamdi Hamdi, Dianta Mustofa Kamal, Johny Wahyuadi M. Soedarsono, Ahmad Maksum
Iop Conference Series Earth and Environmental Science, 2022
Experimental and modelling waste rice husk ash as a novel green corrosion inhibitor under acidic environment
Agus Paul Setiawan Kaban, Wahyu Mayangsari, Mochammad Syaiful Anwar, Ahmad Maksum, Rini Riastuti, Taufik Aditiyawarman, Johny Wahyuadi Soedarsono
Materials Today Proceedings, 2022
UNRAVELING THE STUDY OF LIQUID SMOKE FROM RICE HUSKS AS A GREEN CORROSION INHIBITOR IN MILD STEEL UNDER 1 M HCL
Agus Kaban, Wahyu Mayangsari, Mochammad Anwar, Ahmad Maksum, Taufik Aditiyawarman, Johny Soedarsono, Aga Ridhova, Rini Riastuti
Eastern European Journal of Enterprise Technologies, 2022
EFFECT OF SYZYGIUM CUMINI LEAF EXTRACT AS A GREEN CORROSION INHIBITOR ON API 5L CARBON STEEL IN 1M HCl
Rini Riastuti, Giannisa Mashanafie, Vika Rizkia, Ahmad Maksum, Siska Prifiharni, Agus Kaban, Gadang Priyotomo, Johny Soedarsono
Eastern European Journal of Enterprise Technologies, 2022
SYNTHESIS OF NANOCOMPOSITES REDUCED GRAPHENE OXIDE-SILVER NANOPARTICLES PREPARED BY HYDROTHERMAL TECHNIQUE USING SODIUM BOROHYDRIDE AS A REDUCTOR FOR PHOTOCATALYTIC DEGRADATION OF PB IONS IN AQUEOUS SOLUTION
Nurhayati Indah Ciptasari, Murni Handayani, Caesart Leonardo Kaharudin, Afif Akmal Afkauni, Adhi Dwi Hatmanto, Isa Anshori, Ahmad Maksum, Rini Riastuti, Johny Wahyuadi Soedarsono
Eastern European Journal of Enterprise Technologies, 2022
Magnesium Extraction of Ferronickel Slag Processed by Alkali Fusion and Hydrochloric Acid Leaching
A.B. Prasetyo, A. Khaerul, W. Mayangsari, E. Febriana, A. Maksum, J. Andinie, F. Firdiyono, J.W. Soedarsono
Journal of Mining and Metallurgy Section B Metallurgy, 2021
Decomposition of ferronickel slag through alkali fusion in the roasting process
Wahyu Mayangsari, Isma Nur Avifah, Agus Budi Prasetyo, Eni Febriana, Ahmad Maksum, Reza Miftahul Ulum, Florentinus Firdiyono, Rudi Subagja, Johny Wahyuadi Soedarsono
Eastern European Journal of Enterprise Technologies, 2021
DEVELOPMENT OF WHITE TEA EXTRACT AS GREEN CORROSION INHIBITOR IN MILD STEEL UNDER 1 M HYDROCHLORIC ACID SOLUTION
Agus Paul Setiawan Kaban, Aga Ridhova, Gadang Priyotomo, Berna Elya, Ahmad Maksum, Yunita Sadeli, Sutopo Sutopo, Taufik Aditiyawarman, Rini Riastuti, Johny Wahyuadi Soedarsono
Eastern European Journal of Enterprise Technologies, 2021
Study of various roasting-temperature and holding-time of ilmenite iron sand mixed with Na2CO3to acquire higher titanium concentration
Dimas Nugroho, Ahmad Maksum, Delfiendra, Johny Wahyuadi Soedarsono
Aip Conference Proceedings, 2020
Study of the effect of Na2CO3Mass ratio as an additive in the reduction process of limonite ore to reduce impurities for increasing nickel
Bagas Muhammad Syafa, Naufal Wirasyawal Luneto, Ahmad Maksum, Agus Budi Prasetyo, Reza Miftahul Ulum, Johny Wahyuadi Soedarsono
Aip Conference Proceedings, 2020
The effect of temperature and leaching time of sulfuric acid on increasing nickel and iron content from ferronickel slag waste after alkaline fusion using sodium carbonate
Prinanda Doni Santoso, Arryan Jibril R., Agus Budi Prasetyo, Ahmad Maksum, Reza Miftahul Ulum, Johny Wahyuadi Soedarsono
Aip Conference Proceedings, 2020
The effect of leaching time and concentration of sulfuric acid on increasing nickel and cobalt content from ferronickel slag waste after alkaline fusion using sodium carbonate
Arryan Jibril R., Prinanda Doni Santoso, Agus Budi Prasetyo, Ahmad Maksum, Reza Miftahul Ulum, Johny Wahyuadi Soedarsono
Aip Conference Proceedings, 2020
Effect of sodium carbonate (Na2CO3) additives and palm kernel shell charcoal to increase nickel and iron content from ferronickel slag using the pyrometallurgical method
Muhammad Darryl Alfariz, Wahyu Mayangsari, Agus Budi Prasetyo, Ahmad Maksum, Totok Prasetyo, Reza Miftahul Ulum, Johny Wahyuadi Soedarsono
Aip Conference Proceedings, 2020
The effect of NaCl addition and biomass palm kernel shell charcoal with different ratio on pyrometallurgical process of a wasted ferronickel slag
Shalsabila Nandya Miryana Usman, Samantha Aziza Nurarani, Agus Budi Prasetyo, Ahmad Maksum, Totok Prasetyo, Reza Miftahul Ulum, Johny Wahyuadi Soedarsono
Aip Conference Proceedings, 2020
Increasing nickel from nickel slag with Na2SO4additives and palm kernel shell charcoal reductors using the pyrometallurgical method
Samantha Aziza Nurarani, Shalsabila Nandya Miryana Usman, Agus Budi Prasetyo, Ahmad Maksum, Totok Prasetyo, Reza Miftahul Ulum, Johny Wahyuadi Soedarsono
Aip Conference Proceedings, 2020
Reverse leaching of magnesium from ferronickel slag using alkali solvent naoh
Agus Budi Prasetyo, Rahadian Darmawansyah, Wahyu Mayangsari, Eni Febriana, Sulaksana Permana, Ahmad Maksum, Soesaptri Oediyani, Florentinus Firdiyono, Johny Wahyuadi Soedarsono
Eastern European Journal of Enterprise Technologies, 2020
Preliminary study on the use of rice husk as a reducing agent in iron sand reduction
Muhammad Faris Ghiyats, Ahmad Maksum, Johny Wahyuadi Soedarsono
Iop Conference Series Materials Science and Engineering, 2019
Effect of Sodium Carbonate on the Reduction Process of Nickel Slag from Sulawesi
Arum Cahyanurani Setyabrata, Ahmad Maksum, Agus Budi Prasetyo, Bambang Priyono, Johny Wahyuadi Soedarsono
Iop Conference Series Materials Science and Engineering, 2019
Enrichment of Tantalum and Niobium Contents in Bangka Tin Slag by NaOH and H3PO4Leaching
Hendri F Akli, Sulaksana Permana, Ahmad Maksum, Johny W Soedarsono, Kurnia S Widana, Mutia Anggraini, Badrul Munir
Iop Conference Series Materials Science and Engineering, 2019
Study to Enhance Tantalum and Niobium Contents in Bangka Tin Slag by NaOH and HClO4 Leaching
Shiva F Vincia, Sulaksana Permana, Ahmad Maksum, Johny W Soedarsono, Kurnia S Widana, Kurnia Trinopiawan, Badrul Munir
Iop Conference Series Materials Science and Engineering, 2019
Thermal characteristics of ferronickel slag on roasting process with addition of sodium carbonate (Na2CO3)
A B Prasetyo, A Maksum, J W Soedarsono, F Firdiyono
Iop Conference Series Materials Science and Engineering, 2019
Roasting-quenching pretreatment in the calcination process to improve the purity of rice husk bio-silica
Ahmad Maksum, Andi Rustandi, Sulaksana Permana, Johny Wahyuadi Soedarsono
JP Journal of Heat and Mass Transfer, 2019
The effect of addition of sodium sulphate (Na2SO4) to nickel slag pyrometallurgical process with temperature and additives ratio as variables
Juan Patrick, Agus Budi Prasetyo, Badrul Munir, Ahmad Maksum, Johny Wahyuadi Soedarsono
E3s Web of Conferences, 2018
Analysis effect of temperature on the results of titanomagnetite (Fe 2 TiO 4 -Fe 3 O 4 ) formation in iron sand reduction using coal and sodium sulphate as an additive
Devara Clarissa, Bambang Priyono, Ahmad Maksum, Memed Sumantono, Johny Wahyuadi Soedarsono
E3s Web of Conferences, 2018
The effect of sodium sulfate (Na 2 SO 4 ) and sodium carbonate (Na 2 CO 3 ) addition on the reduction-roasting process of titania iron sand
Agung Nugraha, Bambang Priyono, Ahmad Maksum, Haidir Juna, Johny Wahyuadi Soedarsono
E3s Web of Conferences, 2018
The effect of time variation on the results of increasing titanomagnetite in iron sand at magnetization temperature (800°C) with Na 2 SO 4 addition as additive
Hedi Eka Maulana, Agung Nugraha, Ahmad Maksum, Haidir Juna, Bambang Priyono, Johny Wahyuadi Soedarsono
E3s Web of Conferences, 2018
The effect of NaOH (natrium hydroxide) to slag nickel pyrometallurgy in different temperature and additive ratio
Rafaeldi Harlin Pangaribuan, Juan Patrick, Agus Budi Prasetyo, Ahmad Maksum, Badrul Munir, Johny Wahyuadi Soedarsono
E3s Web of Conferences, 2018
The enhancement of uranium and thorium in Bangka tin slag
S. Permana, J.W. Soedarsono, A. Rustandi, A. Maksum, K.S. Widana, K. Trinopiawan, M. Anggraini
Atom Indonesia, 2018
A preliminary study on the reduction of limonite ore by using rice husk as a reducing agent
Ahmad Maksum, Michael Kelvin E. Husein, Sulaksana Permana, Andi Rustandi, Johny Wahyuadi Soedarsono
Iop Conference Series Materials Science and Engineering, 2018
Upgrading tantalum and niobium oxides content in Bangka tin slag with double leaching
J W Soedarsono, S Permana, J K Hutauruk, R Adhyputra, A Rustandi, A Maksum, K S Widana, K Trinopiawan, M Anggraini
Iop Conference Series Materials Science and Engineering, 2018
Effects of reduction time on carbothermic reduction of lateritic nickel ore using palm kernel shell as green reducing agent
Dwipuji Rahayu, Ahmad Maksum, Johny Wahyuadi Soedarsono
Iop Conference Series Earth and Environmental Science, 2018
Effects of Na2SO4 addition on the selective reduction of limonite ore from Southeast Sulawesi
Rinanda Rahmat, Ahmad Maksum, Delfiendra, Johny Wahyuadi Soedarsono
Iop Conference Series Earth and Environmental Science, 2018
Effect of pellet size addition on the selective reduction of limonite ore from Southeast Sulawesi
Muhammad Azif, Ahmad Maksum, Delfiendra, Johny Wahyuadi Soedarsono
Iop Conference Series Earth and Environmental Science, 2018
Utilization of secang heartwood (caesalpinia sappan l) as a green corrosion inhibitor on carbon steel (API 5L Gr. B) in 3.5% NaCl environment
Erol Efraim Kaban, Ahmad Maksum, Sulaksana Permana, Johny Wahyuadi Soedarsono
Iop Conference Series Earth and Environmental Science, 2018
Effects of temperature on the direct reduction of Southeast Sulawesi's limonite ore
Yudianto, Ahmad Maksum, Delfiendra, Johny Wahyuadi Soedarsono
Iop Conference Series Earth and Environmental Science, 2018
Study on the effects of temperature in the carbothermic reduction laterite ore using palm kernel shell as reducing agent
Risty Hidayanti, Sulaksana Permana, Ahmad Maksum, Johny Wahyuadi Soedarsono
Iop Conference Series Earth and Environmental Science, 2018
Study of curcuma xanthorrhiza extract as green inhibitor for API 5L X42 steel in 1M HCl solution
Johny Wahyuadi Soedarsono, Muhammad Nafies Shihab, Muhammad Fikri Azmi, Ahmad Maksum
Iop Conference Series Earth and Environmental Science, 2018
The influence of palm kernel shell mass ratio as a reducing agent in the lateritic nickel ore carbothermic reduction process
Silmina Adzhani, Risty Hidayanti, Ahmad Maksum, Sulaksana Permana, Johny Wahyuadi Soedarsono
Iop Conference Series Earth and Environmental Science, 2018
Enrichment on Bangka tin slag's tantalum and niobium oxide contents through non-fluoride process
Sulaksana Permana, Shiva Frida Vincia, Anggita Amilia, Ahmad Maksum, Kurnia Setiawan Widana, Johny Wahyuadi Soedarsono
Eastern European Journal of Enterprise Technologies, 2018
Influence of roasting-quenching pretreatment on the rice husk silica prepared by calcination method
Ahmad Maksum, Andi Rustandi, Sulaksana Permana, Johny Wahyuadi Soedarsono
Aip Conference Proceedings, 2017
Other Oxides Pre-removed from Bangka Tin Slag to Produce a High Grade Tantalum and Niobium Oxides Concentrate
S Permana, J W Soedarsono, A Rustandi, A Maksum
Iop Conference Series Materials Science and Engineering, 2016