Pub Date : 2018-01-23DOI: 10.14203/METALURGI.V29I2.288
Rudi Subagja
{"title":"PENGENDAPAN TEMBAGA DARI LARUTAN TEMBAGA SULFAT DENGAN CARA SEMENTASI MENGGUNAKAN BESI","authors":"Rudi Subagja","doi":"10.14203/METALURGI.V29I2.288","DOIUrl":"https://doi.org/10.14203/METALURGI.V29I2.288","url":null,"abstract":"","PeriodicalId":18462,"journal":{"name":"Metalurgija","volume":"29 1","pages":"161-170"},"PeriodicalIF":0.6,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41595635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-23DOI: 10.14203/METALURGI.V29I2.282
S. Sumardi, F. R. Mufakhir, A. Prasetyo
KINETICS STUDY OF MANGANESE LEACHING OF LOW GRADE MANGANESE ORE FROM WAY KANAN REGENCY LAMPUNG PROVINCE USING MOLASSES IN SULFURIC ACID. The experiments of manganese leaching of low grade manganese ore from Way Kanan regency Lampung province using sugarcane molasses as reductan agent in sulfuric acid were investigated. This experiment was conducted to study the processes controlling the leaching rate of manganese ore and the values of the reaction rate constants and / or the diffusion constant and activation energy . Leaching is done with the experimental conditions remain Percent solids 10 % , stirring speed 300 rpm , temperature and concentration are varied , molasses doses as much as 80 g / L. Kinetics behaviour of mangan leaching was predicted by using Shrinking Core model ( SCM) . The results of leaching of low grade manganese ore from Way Kanan regency Lampung province can be done by using molasses as a reducing agent in sulfuric acid medium. Kinetics study of manganese leaching using molasses as reducing agent shows that the rate of manganese leaching is controlled by the diffusion of reaction product through unreacted core with activation energy of 3.73 kcal/mole.
{"title":"STUDI KINETIKA PELINDIAN BIJIH MANGAN KADAR RENDAH DAERAH WAY KANAN LAMPUNG DENGAN MENGGUNAKAN MOLASES DALAM SUASANA ASAM","authors":"S. Sumardi, F. R. Mufakhir, A. Prasetyo","doi":"10.14203/METALURGI.V29I2.282","DOIUrl":"https://doi.org/10.14203/METALURGI.V29I2.282","url":null,"abstract":"KINETICS STUDY OF MANGANESE LEACHING OF LOW GRADE MANGANESE ORE FROM WAY KANAN REGENCY LAMPUNG PROVINCE USING MOLASSES IN SULFURIC ACID. The experiments of manganese leaching of low grade manganese ore from Way Kanan regency Lampung province using sugarcane molasses as reductan agent in sulfuric acid were investigated. This experiment was conducted to study the processes controlling the leaching rate of manganese ore and the values of the reaction rate constants and / or the diffusion constant and activation energy . Leaching is done with the experimental conditions remain Percent solids 10 % , stirring speed 300 rpm , temperature and concentration are varied , molasses doses as much as 80 g / L. Kinetics behaviour of mangan leaching was predicted by using Shrinking Core model ( SCM) . The results of leaching of low grade manganese ore from Way Kanan regency Lampung province can be done by using molasses as a reducing agent in sulfuric acid medium. Kinetics study of manganese leaching using molasses as reducing agent shows that the rate of manganese leaching is controlled by the diffusion of reaction product through unreacted core with activation energy of 3.73 kcal/mole.","PeriodicalId":18462,"journal":{"name":"Metalurgija","volume":"29 1","pages":"111-118"},"PeriodicalIF":0.6,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47481763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-23DOI: 10.14203/METALURGI.V29I1.266
A. Prasetyo, F. Firdiyono, Eni Febriana
{"title":"OPTIMASI PROSES REDUKSI BIJIH NIKEL LATERIT JENIS LIMONIT SEBAGAI BAHAN BAKU NPI (NICKEL PIG IRON)","authors":"A. Prasetyo, F. Firdiyono, Eni Febriana","doi":"10.14203/METALURGI.V29I1.266","DOIUrl":"https://doi.org/10.14203/METALURGI.V29I1.266","url":null,"abstract":"","PeriodicalId":18462,"journal":{"name":"Metalurgija","volume":"29 1","pages":"9-16"},"PeriodicalIF":0.6,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41570255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-23DOI: 10.14203/METALURGI.V29I2.289
M. Silalahi, P. Untoro, B. Suharno, S. Harjanto
Fe-Cr microalloys which obtained by ultrasonic method are the initial cores for the consolidation process. Therefore its facilitate the formation of the homogeneous bulk of Fe-Cr alloy with a stable phase. In this research, the synthesis of bulk of Fe-Cr alloy from the particles mixture of (Fe+Cr) as the ultrasonic treatment results has been carried out. The particles consolidation has been carried out through a process of compaction without adding any lubricants and followed by sintering process in the quartz glass capsules by using induction furnace at 1300 °C. Consolidation of mixture of Fe-Cr particles that have not undergone previous ultrasonic treatment is also made for a comparison. The investigation by using the SEM (scanning electron microscope)- and density measurements method were preformed on the Fe-Cr green powders compaction. The bulk of Fe-Cr alloys that are produced trough sintering process was observed using SEM-EDS (energy dispersive spectroscopy), XRD (x-ray diffraction), and density measurements method. The bulk of Fe-Cr alloy prepared with ultrasonically treated Fe-Cr microalloy powders, is more homogeneous in composition and has a better phase stability in comparison to Fe-Cr powders prepared without the ultrasonic treatment. Production of bulk Fe-Cr alloy in quartz glass capsule during the sintering process has produced Fe-Cr alloy without oxides.
{"title":"ULTRASONIC TREATMENT EFFECT ON THE CONSOLIDATION OF Fe-Cr PARTICLE MIXTURES AFTER COMPACTION AND SINTERING PROCESS","authors":"M. Silalahi, P. Untoro, B. Suharno, S. Harjanto","doi":"10.14203/METALURGI.V29I2.289","DOIUrl":"https://doi.org/10.14203/METALURGI.V29I2.289","url":null,"abstract":"Fe-Cr microalloys which obtained by ultrasonic method are the initial cores for the consolidation process. Therefore its facilitate the formation of the homogeneous bulk of Fe-Cr alloy with a stable phase. In this research, the synthesis of bulk of Fe-Cr alloy from the particles mixture of (Fe+Cr) as the ultrasonic treatment results has been carried out. The particles consolidation has been carried out through a process of compaction without adding any lubricants and followed by sintering process in the quartz glass capsules by using induction furnace at 1300 °C. Consolidation of mixture of Fe-Cr particles that have not undergone previous ultrasonic treatment is also made for a comparison. The investigation by using the SEM (scanning electron microscope)- and density measurements method were preformed on the Fe-Cr green powders compaction. The bulk of Fe-Cr alloys that are produced trough sintering process was observed using SEM-EDS (energy dispersive spectroscopy), XRD (x-ray diffraction), and density measurements method. The bulk of Fe-Cr alloy prepared with ultrasonically treated Fe-Cr microalloy powders, is more homogeneous in composition and has a better phase stability in comparison to Fe-Cr powders prepared without the ultrasonic treatment. Production of bulk Fe-Cr alloy in quartz glass capsule during the sintering process has produced Fe-Cr alloy without oxides.","PeriodicalId":18462,"journal":{"name":"Metalurgija","volume":"29 1","pages":"171-178"},"PeriodicalIF":0.6,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42344794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-23DOI: 10.14203/METALURGI.V29I2.287
Adil Jamali, Ra Binudi, B. Adjiantoro
DECARBURISATION PROCESS OF NICKEL PIG IRON. Nickel Pig Iron or NPI is ferronickel containing less than 15% nickel with sulfur and phosphorus levels higher than ferronickel. NPI is made from low-grade laterite nickel ore, Ni <1.8% which are widely available in Indonesia. The NPI is mainly use as a raw material for making stainless steel and nickel alloy steel. Nickel provides more value in the form of corrosion resistance, ductility, strength and improve weldability properties better than ordinary steel wihout containing of nickel. The aims of this research are to study decarburisation process of NPI with carbon content 3-4% to produce very low carbon laterite steel, C <0.03%. The method used was a laboratory-scale experiment for 200 kg of molten metal. The raw material is melted in electric induction furnace 500 kg capacity, then the liquid metal is poured into the converter. Furthermore, oxygen is blown to the surface of molten metal using a lance pipe coated with refractory materials. Decarburisation process was successfully conducted by blowing oxygen 160 kg / ton of molten metal within 24 minutes, producing very low carbon laterite steel where C = 0.01%.
{"title":"PROSES DEKARBURISASI NICKEL PIG IRON","authors":"Adil Jamali, Ra Binudi, B. Adjiantoro","doi":"10.14203/METALURGI.V29I2.287","DOIUrl":"https://doi.org/10.14203/METALURGI.V29I2.287","url":null,"abstract":"DECARBURISATION PROCESS OF NICKEL PIG IRON. Nickel Pig Iron or NPI is ferronickel containing less than 15% nickel with sulfur and phosphorus levels higher than ferronickel. NPI is made from low-grade laterite nickel ore, Ni <1.8% which are widely available in Indonesia. The NPI is mainly use as a raw material for making stainless steel and nickel alloy steel. Nickel provides more value in the form of corrosion resistance, ductility, strength and improve weldability properties better than ordinary steel wihout containing of nickel. The aims of this research are to study decarburisation process of NPI with carbon content 3-4% to produce very low carbon laterite steel, C <0.03%. The method used was a laboratory-scale experiment for 200 kg of molten metal. The raw material is melted in electric induction furnace 500 kg capacity, then the liquid metal is poured into the converter. Furthermore, oxygen is blown to the surface of molten metal using a lance pipe coated with refractory materials. Decarburisation process was successfully conducted by blowing oxygen 160 kg / ton of molten metal within 24 minutes, producing very low carbon laterite steel where C = 0.01%.","PeriodicalId":18462,"journal":{"name":"Metalurgija","volume":"29 1","pages":"153-160"},"PeriodicalIF":0.6,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49229695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-23DOI: 10.14203/metalurgi.v29i2.285
Solihin Solihin, F. Firdiyono
{"title":"PERILAKU PELARUTAN LOGAM NIKEL DAN BESI DARI BIJIH NIKEL KADAR RENDAH SULAWESI TENGGARA","authors":"Solihin Solihin, F. Firdiyono","doi":"10.14203/metalurgi.v29i2.285","DOIUrl":"https://doi.org/10.14203/metalurgi.v29i2.285","url":null,"abstract":"","PeriodicalId":18462,"journal":{"name":"Metalurgija","volume":"29 1","pages":"139-144"},"PeriodicalIF":0.6,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41628086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-23DOI: 10.14203/metalurgi.v29i1.272
Bintang Adjiantoro, Bambang Sriyono
{"title":"PEMBUATAN MATERIAL KOMPOSIT MATRIKS PADUAN Al–6,2%Mg/Al2O3(p) DENGAN PROSES STIRR-CASTING","authors":"Bintang Adjiantoro, Bambang Sriyono","doi":"10.14203/metalurgi.v29i1.272","DOIUrl":"https://doi.org/10.14203/metalurgi.v29i1.272","url":null,"abstract":"","PeriodicalId":18462,"journal":{"name":"Metalurgija","volume":"29 1","pages":"63-70"},"PeriodicalIF":0.6,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43254391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-23DOI: 10.14203/METALURGI.V29I1.269
Rahardjo Binudi, Bintang Adjiantoro
{"title":"PENGARUH UNSUR Ni, Cr DAN Mn TERHADAP SIFAT MEKANIK BAJA KEKUATAN TINGGI BERBASIS LATERIT","authors":"Rahardjo Binudi, Bintang Adjiantoro","doi":"10.14203/METALURGI.V29I1.269","DOIUrl":"https://doi.org/10.14203/METALURGI.V29I1.269","url":null,"abstract":"","PeriodicalId":18462,"journal":{"name":"Metalurgija","volume":"29 1","pages":"33-40"},"PeriodicalIF":0.6,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42073492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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