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All Journal Jurnal Rekayasa Proses Jurnal Sains Materi Indonesia World Chemical Engineering Journal Teknika: Jurnal Sains dan Teknologi Jurnal Furnace Widyariset Jurnal Teknika Indonesian Journal of Chemistry Jurnal Rekayasa Proses Metalurgi Jurnal Metalurgi dan Material Indonesia Specta Journal of Technology Widyariset Metalurgi Jurnal Rekayasa Proses

Soesaptri Oediyani

Jurusan Teknik Metalurgi, Universitas Sultan Ageng Tirtayasa

Author-ID : 564860

Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics Social Sciences

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The Added Value of Copper and Silver Metal from Printed Circuit Boards Waste Using Davis Tube with Variations of Size and Magnetic Intensity Oediyani, Soesaptri; Suwandana, Rahman Faiz; Triana, Tiara; Kusumangingtyas, Dewi; Pradana, Adjie; Syaifara, Zuhrainis
Metalurgi Vol 39, No 1 (2024): Metalurgi Vol. 39 No. 1 2024
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2024.747

The widespread use of electronic devices has led to a significant increase in electronic waste, including PCB (printed circuit board) waste. PCBs contain valuable metals like copper and silver, which can be reclaimed and reused. Recently, there has been a growing demand for urban mining processes to extract electronic waste PCB Flame Retardant-2 (FR-2) from laptops and computers. During the urban mining process, PCB FR-2 waste undergoes various physical treatments such as dismantling, crushing, and concentration processes. One of the concentration processes involves magnetic separation using a Davis tube. This study aims to investigate the effects of size and magnetic intensity variations on the recovery of copper and silver levels in FR-2 PCB waste. The magnetic concentration process was carried out using different size ranges (-63+100#, -100+150#, -150#) and magnetic intensities (1000 G, 2000 G, 3000 G). The results indicated that the most effective size for separating copper and silver is -63+100# and the optimal magnetic intensity is 1000 G. This resulted in copper and silver content of 45.66% and 0.162%, with recoveries of 80.135% and 62.505% respectively.

Kinetic of Dissolution of Nickel Limonite Calcine by Sulfuric Acid Solution Setiawan, Iwan; Nabilah, Annisa; Oediyani, Soesaptri; Subagja, Rudi; Irawan, Januar; Sampoerno, Arief Budi; Yunita, Fariza Eka; Suharyanto, Ariyo; Syahid, Adi Noer
Metalurgi Vol 38, No 3 (2023): Metalurgi Vol. 38 No. 3 2023
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2023.740

Currently, more than 60% of nickel processing is carried out using nickel sulfide as a raw material. Nonetheless, due to the depletion reserves of nickel sulphide, nickel laterite has drawn a lot of interest to be processed as raw material. Nickel laterite in Indonesia is generally found in low grades, with nickel concentration of <1.15%. One method of treating nickel limonite is leaching in a sulfuric acid solution. This study aims to determine the reaction rate in the leaching process of calcine nickel limonite and the effect of sulfuric acid concentration and leaching temperature on the percent nickel extraction. In this research, the limonite ore from Pomalaa, Southeast Sulawesi, Indonesia, which has undergone a reduction process, was used as raw material. This research was conducted by leaching method on nickel limonite calcine using sulfuric acid reagent with 0.2, 0.5, and 1 M concentration variation, temperature variations of 60, 70, and 90°C, stirring speed 500 rpm, and %S/L (w/w) 10%. In this leaching research, the activation energy obtained at a sulfuric acid concentration of 0.2, 0.5, and 1 M are 13,7379 kJ/mol, 19,7582 kJ/mol, 20,3161 kJ/mol, respectively. The leaching process of nickel limonite calcine was controlled by diffusion. The optimum nickel extraction percentage in this study was 97.45%, obtained at a concentration of 1 M sulfuric acid, temperature of 70 °C, and leaching time of 240 minutes.

Electrocoagulation in Wastewater from Spent-Batteries Recycling Mufakhir, Fika Rofiek; Khotimah, Chusnul; Oediyani, Soesaptri; Astuti, Widi; Sumardi, Slamet; Prasetia, Hendra; Arham, La Ode; Hakim, Hafid Zul; Petrus, Himawan Tri Bayu Murti; Poernomo, Venny
Indonesian Journal of Chemistry Vol 24, No 4 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.93262

This study uses electrocoagulation to investigate reducing heavy metal content in wastewater from discharging spent batteries. ICP-OES analysis shows that heavy metals exceed the environmental water standard. The electrocoagulation procedure was conducted within a reactor with a 500 mL volume and a rectifier with a 5 A current capacity. Three types of electrode material combinations were used: iron (Fe) and aluminium (Al) as well as Fe-Fe, Al-Al, and Fe-Al pairs with 1 cm in the distance by parallel monopolar cells. Alternating current was used with 30, 40, and 50 A/m2 current density. The best result shown in the Fe-Al electrode pair combination system at 40 A/m2 for 30 min contact time and removal efficiencies for Co, Cd, Ni, Zn, and As is 98.76, 90.73, 99.32, 97.93, and 97.78%, respectively, while for Hg it is 31.84%, even though only Cd is above the standard limit. The heavy metal bearing was confirmed using SEM-EDS in the floc and the precipitate residue. The dissolved electrode materials and electrical energy consumed are 0.32 g and 0.109 kWh/m3, respectively. This method can be a good alternative for treating wastewater compared to direct current electrocoagulation, where the electrode and energy will be less consumed.

Centrifugal Concentration of Mandailing Natal North Sumatera Gold Ores Using Knelson Concentrator Oediyani, Soesaptri; Triana, Tiara; Ifzan, Ifzan; Mamby, Hasudungan Eric
World Chemical Engineering Journal VOLUME 5 NO. 2 DECEMBER 2021
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v5i2.12974

Gravity concentration is the type of separation process of minerals based upon the difference in density. This technique has been known for centuries. It has the ability to separate the valuable minerals with relatively low production cost and little environmental impact, such as gold ores. Separation of gold from gangue minerals by using gravity concentration has been used for decades. In fact, it has the limitation to process fine particles. In attempt to recover fine particles using gravity concentration methods, the technique has been developed by combining centrifugal force. One of wellknown devices, Knelson Concentrator, was used to separate gravity recoverable golds (GRG) from the gangue minerals of Mandailing Natal (North Sumatera) sulfide complex gold ores with -200# of particle size. The head grade of ores was 5 g/t of gold. The ores were separated by using Knelson Concentrator with variation of pulp density, feeding rate, and water fluidization pressure. The results have proved that these three variables have particular impacts on gold recovery. The recovery of gold was increased by the increasing of pulp density until it reached the optimum level in 25% of solid with 86.9% of gold recovered, and then decresed by increasing of pulp density into 84.88% of gold with 30% of solid in pulp. It has the same trends in variation of feeding rate and water fluidization pressure. The highest point with 87.08% of recovery and 17.88 g/t of concentrate grade was anchieved at 25% of solid, 0.7 kg/minutes of feeding rate, and 2.7 kg/cm2 of water fluidization pressure.

Pelarutan emas pada pelindian konsentrat emas hasil roasting menggunakan reagen tiosianat Fika Rofiek Mufakhir; Jones Maima Sinaga; Soesaptri Oediyani; Widi Astuti
Jurnal Rekayasa Proses Vol 13 No 1 (2019): Volume 13, Number 1, 2019
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.41519

Dissolution of gold from roasting concentrate of gold ore using potassium thiocyanate with the presence of ferric chloride as an oxidizer was investigated. The concentrate was taken from Lengkukai gold mine. Gold ore particles under 53 µm in size were roasted at varied temperature, separated using wet magnetic separator, and finally leached. The X-ray diffraction (XRD) analysis showed that there were phase changes after roasting with the emergence of new phases such as hematite, pyrrhotite, and almandine. Leaching of gold concentrate after roasting and magnetic separation showed that gold was in non-magnetic concentrate at 950oC with the highest gold dissolution of 0.95 mg/L, while magnet concentrate was completely absent. Experiments with the addition of Fe3+ ion oxidizers for 24-hour range did not have significant effect on gold dissolution. The highest gold concentration obtained of 2.29 mg/L was obtained at 12 hours with 0.1 M FeCl3. The increase of thiocyanate reagent concentrations, which showed a linear correlation to gold dissolution, produced up to 2.25 mg/L of gold concentration (12 hours at 0.3 M KSCN).

A Preliminary Study of Cobalt Solvent Extraction from Nickel Sulphate Solution Using Organic Extractant-PC-88A Subagja, Rudi; Rohman, Arief Dwi; Milandia, Anistasia; Oediyani, Soesaptri; Setiawan, Iwan
Metalurgi Vol 38, No 1 (2023): Metalurgi Vol. 38 No. 1 2023
Publisher : National Research and Innovation Agency (BRIN)

In present study, a solvent extraction experiment has been done to separate cobalt from the nickel sulfate solution by using 2-ethythexyl phosponic acid mono-2-ethylhexyl ester (PC-88A) as extractant. The experiment was carried out on a laboratory scale by using a separating funnel to extract cobalt from the nickel sulfate solution with PC88A. The mixed solution was shake in separating funnel for a specified period of time, and after the solvent extraction experiment was finished the organic phase PC88 was separated from the nickel sulfate solution by decantation. The nickel and cobalt content in the aqueous nickel sulfate solution were then analyzed using Atomic absorption spectrophotometry (AAS). In this experiment, the variable for experiments were covering solution pH from 2 to 6, shaking time from 30 minutes to 120 minutes, shaking speed from 20 revolutions per minute (rpm) to 80 rpm, and the volumeratio of aqueous to organic phase (A:O ratio) was from 1:1 to 1:4. The effects that experimental variables to the cobalt extraction were observed in this experiment. The result of experiment at room temperature, solution pH 5, shaking speed 60 rpm, shaking time 90 minutes, A:O ratio 1:4 and concentration of PC- 88A 40% show 97.21% of cobalt can be extracted by PC-88A from nickel sulfate solution, thererfore it was necessary to conduct two stage extraction process to extract 100% of the cobalt from the nickel sulfate solution.

IRON REMOVAL PROCESS FROM NICKEL PREGNANT LEACH SOLUTION USING SODIUM HYDROXIDE Zunaidi, Mochamad Afriansyah; Setiawan, Iwan; Oediyani, Soesaptri; Irawan, Januar; Rhamdani, Ahmad Rizky; Syahid, Adi Noer
Metalurgi Vol 37, No 3 (2022): Metalurgi Vol. 37 No. 3 Desember 2022
Publisher : National Research and Innovation Agency (BRIN)

Indonesia is a country that has abundant mineral resources, including nickel resources in laterite ore. Nickel demand has risen significantly because of the need for nickel precursors for battery production. Nickel laterite can be processed via the hydrometallurgical route to obtain nickel precursor by leaching the laterite ore with an acid solution to produce a nickel-rich solution or Pregnant Leach Solutions (PLS). This nickel-rich solution is then processed by precipitation with a base solution to make its hydroxides known as Mixed Hydroxides Precipitate (MHP). MHP is the main product that contains nickel and cobalt for making the material for a lithium battery. PLS usually contain iron impurity, which also dissolves when the ore is leached. Therefore, the iron needs to be separated to make high-purity MHP. To solve this problem, synthetic PLS contained nickel, cobalt, and iron, and their concentration was simulated to match the general PLS composition. From the experiment, it was observed that iron could be precipitated at two stages at solution pH of 3 and 3.5 using 2.5 M NaOH solution. After that, nickel and cobalt can be precipitated at higher pH. To study the effect of pH and temperature on the yield of nickel and cobalt precipitation, precipitation at pH of 7, 8, and 9; and temperature of 70, 80, and 90 °C was conducted. The results show that the highest yield was obtained at a pH of 9 and temperature of 90 °C, with precipitation yield of nickel and cobalt at 99.03% and 98.78%, respectively.

Study on Leaching Lanthanum From Ferronickel Slag With Pretreatment Alkaline Fusion Yudomustafa, Fakhruddin; Febriana, Eni; Mayangsari, Wahyu; Ciptasari, Nurhayati Indah; Akbar, Ari Yustisia; Hendrik, Hendrik; Oediyani, Soesaptri; Prasetyo, Agus Budi
Metalurgi Vol 39, No 2 (2024): Metalurgi Vol. 39 No. 2 2024
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2024.764

Ferronickel slag is a byproduct of nickel ore smelting. Several efforts have been made to find alternative applications for ferronickel slag, such as the production of construction materials, cement, or geopolymers. It is reported that 38% is used for road construction, 48% is used for industrial cement mixtures, and the rest is used for fertilizers, geopolymers, and hydraulic techniques. Ferronickel slag still contains some valuable minerals such as silica, magnesium, nickel, iron, and several REEs (rare earth elements). One of the REEs, namely lanthanum, has many applications, including Ni-MH (nickel-metal hydride) batteries, phosphors for lamps, fluid-cracking catalysts for oil refining, LaNi5 for hydrogen gas storage, metal alloys for cast iron, steel and magnesium alloys, additives for glassware (for cameras), and lanthanum hexaboride ceramic. In connection with the slag, which contains impurities in strong silica compounds, it is necessary to carry out an alkaline fusion treatment. Alkaline fusion was carried out by varying the time from 0.5 to 4 hours and the ratio of the mass of slag to NaOH: 1:0.6, 1:1, 1:1.23, 1:1.47, and 1:1.84. The biggest decrease in SiO2 was in the 3-hour alkaline fusion time, from 48.347% to 27.3%, and in the mass ratio at 1:1.47, from 48.347% to 21.413%. This research aims to provide added value for ferronickel slag by extracting lanthanum by acid leaching using H2SO4 reagent by varying the time (5, 10, 30, 60, and 120 minutes), temperature (30, 60, and 90 °C), and concentration (1, 2, and 3 M). The results showed that the best leaching point was at 5 minutes, 30 °C, and 1 M, yielding a lanthanum extraction percentage of 38.082%.

Study of Iron and Calcium Removal on Manganese Sulfate Precursors for Battery Cathode Raw Material Applications Hakim, Agsel Fauzia; Andriyah, Lia; Oediyani, Soesaptri; Lalasari, Latifa Hanum; Sulistiyono, Eko; Irawan, Januar; Arini, Tri; Yunita, Fariza Eka; Suharyanto, Ariyo; Setiawan, Iwan; Firdiyono, Florentinus; Yuwono, Akhmad Herman
Metalurgi Vol 39, No 2 (2024): Metalurgi Vol. 39 No. 2 2024
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2024.753

Global battery sales are expected to reach $310.8 billion in 2027, up 14.1% from 2020. 95% of the world's batteries are lead-acid, lithium-ion, or nickel-based. One of the most popular batteries on the global market is lithium-ion, which uses MnSO4 powder as its cathode raw material. Manganese sulfate-based lithium-ion batteries can be made using Indonesian resources, specifically manganese ore from Trenggalek. Trenggalek manganese ore is of poor quality and contains impurities, primarily Fe and Ca. To produce 98% powder manganese sulfate, the solution is prepared, reduced with briquette charcoal, leached, precipitated, carbonated, and crystallised. NH4OH reagent is used to remove Fe through precipitation, and the carbonatation process is employed to eliminate Ca, resulting in 97.237% purity of manganese sulfate powder product. This outcome is achieved under precipitation process conditions of [NH4OH 2M], T = 80 °C, pH = 4, t =180 minutes, while carbonatation process conditions are T=50 °C, t = 120 minutes.

Pengaruh Kertas Habis Pakai dengan Penambahan Serbuk Kayu dan Binder Molase terhadap Slag Depressant Berbentuk Silinder dan Kubus Nurul Hidayah Kambuna, Bening; Suwandana, Rahman Faiz; Oediyani, Soesaptri; Budiharto, Arief Yusuf; Ali, Bintang Miraj; Imran, Muhammad Ali; Nabilah, Siti; Ramadhan, Naufal Rafeca
SPECTA Journal of Technology Vol. 7 No. 2 (2023): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v7i2.928

Penggunaan pengurangan kertas merupakan salah satu upaya dalam mengimplementasikan kebijakan green campus. Pada proses pembuatan baja, terdapat fenomena slag foam, namun diperlukan slag depressant untuk mengurangi jumlah slag foam. Slag depressant terbuat dari bahan organik, salah satunya adalah kertas. Oleh karena itu, limbah kertas dimanfaatkan untuk membuat slag depressant. Slag foam pada basic oxygen furnace merupakan fenomena gelembung busa atau gas yang terbentuk selama proses produksi baja. Untuk mengurangi terbentuknya slag foam, diperlukan suatu bahan yang disebut slag depressant. Sebuah penelitian dilakukan dengan penambahan molase sebagai bahan pengikat dan serbuk gergaji sebagai campuran bahan organik dengan variasi komposisi 5%, 10%, dan 15% molase dan 5%, 10%, dan 15% serbuk gergaji. Selain itu, dilakukan juga studi perbandingan antara bentuk silinder dan kubus. Penelitian dilakukan dengan mencampurkan bahan baku berupa bahan organik, batu kapur, terak tanur tinggi, dan molase. Setelah itu, slag depressant dibentuk dan dikeringkan. Hasil penelitian menunjukkan bahwa penambahan bahan organik dari serbuk kayu dapat mempengaruhi kualitas slag depressant. Nilai volatile matter tertinggi sebesar 37,14% pada penambahan 15% serbuk kayu, dan nilai porositas terkecil sebesar 16,39% pada penambahan 5% serbuk kayu. Penambahan molase meningkatkan kekuatan slag depressant. Slag depressant memiliki nilai tertinggi sebesar 98,05% pada uji pecah dan nilai kuat tekan tertinggi sebesar 2247,91 N/cm2 pada penambahan 15% molase.

Co-Authors Aflahal Putra Zain Agnes Stephani Ahmadi, Rapli Nur Akbar, Ari Yustisia Akhmad Herman Yuwono Alflahal Putra Zain, Alflahal Putra Ali, Bintang Miraj Andinnie Juniarsih Andinnie Juniarsih, Andinnie Andriyah, Lia Anistasia Milandia Anistasia Milandia, Anistasia Antoro, Iwan Dwi Arham, La Ode Arini Nikitasari Ariyo Suharyanto Bening Nurul Hidayah Kambuna Bobby Fadillah Budiharto, Arief Yusuf Chusnul Khotimah Ciptasari, Nurhayati Indah Della Izzaty Salman Efendi Mabruri Eka Fitri Wulandari Eko Sulistiyono Eko Sulistiyono, Eko Elma Firdaus Fariza Eka Yunita Febriana, Eni Fika Rofiek Mufakhir Florentinus Firdiyono Gadang Priyotomo Gadang Priyotomo Hafid Zul Hakim Hakim, Agsel Fauzia Handayani, Murti Hendrik Hendrik Henpristian, Yopy Himawan Tri Bayu Murti Petrus Ifzan, Ifzan Imran, Muhammad Ali Intan, Vanessa Irawan, Januar Iwan Dwi Antoro Iwan Setiawan J M Sinaga Jayawarsa, A.A. Ketut Jones Maima Sinaga Kusnadi Kusnadi Kusnadi Kustiarana Willyandhika, Kustiarana Kusumangingtyas, Dewi Lalasari, Latifa Hanum Latifa Hanum Lalasari Lestari, Yulinda Lia Andriyah Mabruri, Efendi Mamby, Hasudungan Eric Maya Saputri Mufakhir, Fika Rofiek Murti Handayani NABILAH, ANNISA Nabilah, Siti Nadia Chrisayu Natasha Poernomo, Venny Pradana, Adjie Prasetyo, Agus Budi Rahman Faiz Suwandana Ramadhan, Naufal Rafeca Rapli Nur Ahmadi Rhamdani, Ahmad Rizky Rindang Puspa Rini Rivaldo Ramadhana Saputra Rohman, Arief Dwi Salman, Della Izzati Sampoerno, Arief Budi Saputra, Rivaldo Ramadhana Slamet Sumardi, Slamet Subagja, Rudi Suharto Suharto Suharyanto, Ariyo Suratman Suratman Syahid, Adi Noer Syaifara, Zuhrainis Tiara Triana Tio Aji Pamungkas Tri Arini Tri Arini, Tri Triana, Tiara Triana, Tiara Wahyu Mayangsari Widi Astuti Widi Astuti Yopy Henpristian Yudomustafa, Fakhruddin Yulinda Lestari Yunita, Fariza Eka Zunaidi, Mochamad Afriansyah

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