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Eko Sulistiyono

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Author-ID : 6151702

Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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PENGARUH MEDIA SUSPENSI TERHADAP PROSES ULTRASONIC MILLING PADA PARTIKEL HYDROMAGNESITE[The Influence of Suspension Media on Ultrasonic Milling Process in Particle Hydromagnesite] Eko Sulistiyono; Azwar Manaf; F Firdiyono
Metalurgi Vol 27, No 2 (2012): Metalurgi Vol. 27 No. 2 Agustus 2012
Publisher : National Research and Innovation Agency (BRIN)

PELARUTAN TERAK TIMAH BANGKA MENGGUNAKAN LARUTAN NaOH [Dissolution Of Tin Slag Bangka Using NaOH Solution] Ariyo Suharyanto; Eko Sulistiyono; F Firdiyono
Metalurgi Vol 29, No 3 (2014): Metalurgi Vol.29 NO.3 Desember 2014
Publisher : National Research and Innovation Agency (BRIN)

PROSES PELARUTAN ASAM SULFAT DAN ASAM KLORIDA TERHADAP HASIL REDUKSI TERAK TIMAH [Dissolution Process Of Sulphate Acid And Hidrochloride Acid In Reduction Tin Slag] Eko Sulistiyono; F firdiyono; Ariyo Suharyanto
Metalurgi Vol 29, No 3 (2014): Metalurgi Vol.29 NO.3 Desember 2014
Publisher : National Research and Innovation Agency (BRIN)

EFFECTIVENESS OF THE SEPARATION OF MAGNESIUM AND LITHIUM FROM SEAWATER WITH SODIUM SILICATE PRECIPITATION PROCESS Latifa Hanum Lalasari; Eko Sulistiyono; Sri Harjanto; Florentinus Firdiyono; Nadya Chrisayu Natasha; Yosephin Dewayani
Metalurgi Vol 37, No 1 (2022): Metalurgi Vol. 37 No. 1 April 2022
Publisher : National Research and Innovation Agency (BRIN)

Experiments have been carried out to separate elements of magnesium and lithium from seawater to produce a lithium concentrate product that is free of magnesium through sodium silicate precipitation processes. In this study, the sample used was seawater taken from the Ancol Lagoon Area, North Jakarta. The sea water used contains 0.1674 ppm lithium ions and 1761 ppm magnesium ions with a high Mg/Li ratio of 10521. The seawater containing high levels of magnesium is not suitable as a raw material for for the manufacture of lithium carbonate (battery active ingredient) prior to initial processing. The research variable was the volume of sodium silicate solution added by 10 ml, 20 ml, 30 ml, 40 ml, 50 ml, 60 ml, 70 ml, and 100 ml which were equivalent to 13%, 27% 40%, 53%, 67%. , 80 %, 93%, and 107% stoichiometry of magnesium ion and the technique of adding sodium silicate solution included a single stage and multi-stages. From the experimental results, it can be seen that the most effective addition of sodium silicate is the addition of 80% stoichiometry. The sodium silicate precipitation process succeeded in separating magnesium ions and lithium ions from seawater as indicated by a decrease in the Mg/li ratio from 10521 to 64. The obstacle in this study was that there were still many lithium ions that were also precipitated with magnesium silicate during the precipitation process so that the lithium lost in the filtrate reached 82.26% in the single stage process. Therefore, a multi-stage process was carried out with 6 stages of the process that the addition of sodium silicate for each stage was 1/6 of the volume of sodium silicate solution at single stage optimum conditions. The results obtained from the multi-stage process were able to reduce the lithium ion lost in the filtrate to 76.54%. From the results of the study, it can be concluded that efforts to reduce the percentage of lithium ions lost in the filtrate product need to be carried out through the development of a sodium silicate precipitation process.

The Effect of Voltage and Time In Synthesis Manganese Dioxide from Manganese Sulfate Precursor Eka Fitri Wulandari; Lia Andriyah; Soesaptri Oediyani; Latifa hanum Lalasari; Tri Arini; Nadia Chrisayu Natasha; Fariza Eka Yunita; Ariyo Suharyanto; Eko Sulistiyono
Metalurgi Vol 37, No 1 (2022): Metalurgi Vol. 37 No. 1 April 2022
Publisher : National Research and Innovation Agency (BRIN)

The utilization of manganese dioxide (MnO2) as a cathode material for lithium-ion battery has attract many attentions because of their excellent electrochemical properties which have high theoretical storage capacity of 615 mAh/g. In this study, synthesis of MnO2 was carried out from manganese sulfate (MnSO4) precursor which is a pregnant leach solution from the leaching process of manganese ore from Trenggalek Regency. The electrolysis method has been used in this synthesis of MnO2 in an electrochemical cell consisting of two graphite electrodes with dimensions (16 x 5 x 0,3) cm. The purpose of this study is to determine the effect of voltage and time to particles amount of MnO2, to determine the phase and crystal structure of MnO2 and its morphological microstructure. The electrolysis process was carried out in 2000 ml of MnSO4 solution under constant stirring at 60oC with DC voltage varied by 2, 4, 6 and 8 volt and time varied by 4, 8, 12 and 16 hours. The precipitates formed at anode were separated, then the particles were dried at 110oC for 2 hours. The main contain of MnO2 were analyzed by X-Ray Fluorescence (XRF), the phase and crystal structure were evaluated by X-Ray Diffraction (XRD) and the morphological microstructure were captured by Scanning Electron Microscope (SEM). The results revealed that the highest particles amount of MnO2 is 31,63 grams which is electrolyzed at 8 volts for 16 hours. The highest purity of MnO2 is 89,23% which is electrolyzed at 2 volts for 16 hours. The particles produced were α-MnO2 with a tetragonal crystal system and nearly spherical in shape with size particles ranged from 136,01-202,48 and 144-352 nm.

Co-Authors Ariyo Suharyanto Azwar Manaf Eka Fitri Wulandari F Firdiyono F Firdiyono Fariza Eka Yunita Florentinus firdiyono Latifa Hanum Lalasari Latifa Hanum Lalasari Lia Andriyah Nadia Chrisayu Natasha Nadya Chrisayu Natasha Soesaptri Oediyani Sri Harjanto Tri Arini Yosephin Dewayani

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