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All Journal Jurnal Teknologi Mineral dan Batubara Indonesian Mining Journal Jurnal Teknologi Mineral dan Batubara Indonesian Mining Journal
Dianawati, Erika Arum
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Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology

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STUDI PERBANDINGAN PROSES PELINDIAN UNTUK EKSTRAKSI SKANDIUM DARI TERAK RESIDU BAUKSIT Sariman; Rochani, Siti; Saleh, Nuryadi; Rodliyah, Isyatun; Dianawati, Erika Arum; Wijayanti, Retno
Jurnal Teknologi Mineral dan Batubara Vol 19 No 3 (2023): Jurnal Teknologi Mineral dan Batubara Edisi September 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol19.No3.2023.1509

Abstract

Scandium is classified as a rare earth element. Its existences are geochemically in small amounts as associate minerals. Consequently, scandium production is minimally from processing residues of major minerals. Indonesia has large bauxite deposits, and it is processed into alumina, producing bauxite residue as a by-product. The bauxite residue contains rare earth metals, including scandium. In this study, various ways of extracting scandium from bauxite residue slag were carried out. The bauxite residue beneficiation process was done through a smelting reduction process followed by magnetic separation. Scandium extractions were carried out from the bauxite residue slag through a leaching process with concentrated sulfuric, sulfation, alkali fusion, and a 2-stage acid leaching. The best percentage of scandium extracted was obtained at 88.40%, using the 2-stage acid leaching at the acid concentration of 500 g/kg, the temperature of 90oC, and the leaching time at 3 hours for each leaching stage. In addition, the best neodymium extracted achieved  76,97%, using the alkali fusion, fused in NaOH at 700oC for 3 hours.
OPTIMASI PERSEN BINDER, BEBAN KOMPAKSI, DAN SUHU SINTERING DALAM PEMBUATAN BATU BATA TINGGI ALUMINA MENGGUNAKAN APLIKASI RSM (RESPONSE SURFACE METHODOLOGY) Dianawati, Erika Arum; Sirait, Phichiato; Wibawa, Aditya; Husaini; Aryanti, Putu Teta Prihartini
Jurnal Teknologi Mineral dan Batubara Vol 20 No 1 (2024): Jurnal Teknologi Mineral dan Batubara Edisi Januari 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No1.2024.1522

Abstract

PT Indonesia Chemical Alumina (ICA) is a company that produces 300,000 tons of chemical grade alumina (CGA) per year. Of this amount, there is an average of 15,000 tons that do not meet market specifications every year. Alumina that does not meet this specification is only piled up by PT. ICA and takes up space, so it is economically detrimental to the company because they have to provide space to accommodate it. In fact, this alumina has a very high Al2O3 content and is in the form of an alpha phase or α-Al2O3 which is the most stable phase at the highest temperatures, so it can be processed into useful materials and has high added value such as high alumina bricks through compaction and sintering. Process conditions such as percent binder, load during compaction and sintering temperature greatly affect the quality of the high alumina bricks produced. The purpose of this study is to optimize the process conditions for making high-alumina bricks by identifying the relationship between input variables and the measured responses and developing a prediction model for experimental variations that will be used in optimizing the process conditions for the manufacture of high alumina bricks. The Design Expert 7.0® program with Box-Behnken Design Response Surface Methodology (RSM) is used to research and select process conditions from a combination of factor levels that produce an optimal response. Based on RSM Box-Behnken Design it is known that the main effects of binder percentage, compaction load and sintering temperature are factors that greatly influence the response value of high alumina bricks. The optimal response value for high alumina bricks is a compressive strength of 8.2229 MPa, with a process condition of 3% binder percent, a compacting load of 10 tons and a sintering temperature of 1600ºC.
PEROLEHAN MINERAL BESI DARI RESIDU BAUKSIT INDONESIA Sariman; Rochani, Siti; Saleh, Nuryadi; Wijayanti, Retno; Dianawati, Erika Arum
Indonesian Mining Journal Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol27.No1.2024.1538

Abstract

Bauxite residue, a solid waste discharged during alumina extraction, is a hazardous material. Its disposal leads to a serious environmental issue although it contains valuable matter such as titanium, silica, rare earth elements, and high iron content (20-60%). This work aims to improve the recovery of iron content within the bauxite residue using three methods, namely direct magnetic separation, roasting followed by magnetic separation, and reduction followed by magnetic separation. Coal as a reductant and Na2CO3 and Na2SO3 as fluxes were used in the reduction process. The result of the study reveals that the direct magnetic separation produces iron concentrate with the Fe content of 53.69% and a recovery of 26.72%, while the roasting process at 900˚C and magnetic separation produces a concentrate of 54.57% Fe with a recovery of 37.33%. The best method was by reduction and magnetic separation process using 4% of Na2CO3  producing iron concentrates with a content of 63.53% Fe and recovery of 74.73%.
PEROLEHAN MINERAL BESI DARI RESIDU BAUKSIT INDONESIA Sariman; Rochani, Siti; Saleh, Nuryadi; Wijayanti, Retno; Dianawati, Erika Arum
Indonesian Mining Journal Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol27.No1.2024.1538

Abstract

Bauxite residue, a solid waste discharged during alumina extraction, is a hazardous material. Its disposal leads to a serious environmental issue although it contains valuable matter such as titanium, silica, rare earth elements, and high iron content (20-60%). This work aims to improve the recovery of iron content within the bauxite residue using three methods, namely direct magnetic separation, roasting followed by magnetic separation, and reduction followed by magnetic separation. Coal as a reductant and Na2CO3 and Na2SO3 as fluxes were used in the reduction process. The result of the study reveals that the direct magnetic separation produces iron concentrate with the Fe content of 53.69% and a recovery of 26.72%, while the roasting process at 900˚C and magnetic separation produces a concentrate of 54.57% Fe with a recovery of 37.33%. The best method was by reduction and magnetic separation process using 4% of Na2CO3  producing iron concentrates with a content of 63.53% Fe and recovery of 74.73%.
STUDI PERBANDINGAN PROSES PELINDIAN UNTUK EKSTRAKSI SKANDIUM DARI TERAK RESIDU BAUKSIT Sariman; Rochani, Siti; Saleh, Nuryadi; Rodliyah, Isyatun; Dianawati, Erika Arum; Wijayanti, Retno
Jurnal Teknologi Mineral dan Batubara Vol 19 No 3 (2023): Jurnal Teknologi Mineral dan Batubara Edisi September 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol19.No3.2023.1509

Abstract

Scandium is classified as a rare earth element. Its existences are geochemically in small amounts as associate minerals. Consequently, scandium production is minimally from processing residues of major minerals. Indonesia has large bauxite deposits, and it is processed into alumina, producing bauxite residue as a by-product. The bauxite residue contains rare earth metals, including scandium. In this study, various ways of extracting scandium from bauxite residue slag were carried out. The bauxite residue beneficiation process was done through a smelting reduction process followed by magnetic separation. Scandium extractions were carried out from the bauxite residue slag through a leaching process with concentrated sulfuric, sulfation, alkali fusion, and a 2-stage acid leaching. The best percentage of scandium extracted was obtained at 88.40%, using the 2-stage acid leaching at the acid concentration of 500 g/kg, the temperature of 90oC, and the leaching time at 3 hours for each leaching stage. In addition, the best neodymium extracted achieved  76,97%, using the alkali fusion, fused in NaOH at 700oC for 3 hours.
OPTIMASI PERSEN BINDER, BEBAN KOMPAKSI, DAN SUHU SINTERING DALAM PEMBUATAN BATU BATA TINGGI ALUMINA MENGGUNAKAN APLIKASI RSM (RESPONSE SURFACE METHODOLOGY) Dianawati, Erika Arum; Sirait, Phichiato; Wibawa, Aditya; Husaini; Aryanti, Putu Teta Prihartini
Jurnal Teknologi Mineral dan Batubara Vol 20 No 1 (2024): Jurnal Teknologi Mineral dan Batubara Edisi Januari 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No1.2024.1522

Abstract

PT Indonesia Chemical Alumina (ICA) is a company that produces 300,000 tons of chemical grade alumina (CGA) per year. Of this amount, there is an average of 15,000 tons that do not meet market specifications every year. Alumina that does not meet this specification is only piled up by PT. ICA and takes up space, so it is economically detrimental to the company because they have to provide space to accommodate it. In fact, this alumina has a very high Al2O3 content and is in the form of an alpha phase or α-Al2O3 which is the most stable phase at the highest temperatures, so it can be processed into useful materials and has high added value such as high alumina bricks through compaction and sintering. Process conditions such as percent binder, load during compaction and sintering temperature greatly affect the quality of the high alumina bricks produced. The purpose of this study is to optimize the process conditions for making high-alumina bricks by identifying the relationship between input variables and the measured responses and developing a prediction model for experimental variations that will be used in optimizing the process conditions for the manufacture of high alumina bricks. The Design Expert 7.0® program with Box-Behnken Design Response Surface Methodology (RSM) is used to research and select process conditions from a combination of factor levels that produce an optimal response. Based on RSM Box-Behnken Design it is known that the main effects of binder percentage, compaction load and sintering temperature are factors that greatly influence the response value of high alumina bricks. The optimal response value for high alumina bricks is a compressive strength of 8.2229 MPa, with a process condition of 3% binder percent, a compacting load of 10 tons and a sintering temperature of 1600ºC.
Co-Authors . Sariman Aryanti, Putu Teta Prihartini Husaini Isyatun Rodliyah, Isyatun Nuryadi Saleh, Nuryadi Retno Wijayanti SARIMAN Sirait, Phichiato Siti Rochani, Siti Wibawa, Aditya