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Siti Rochani
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THE CURRENT STATUS OF IRON MINERALS IN INDONESIA Siti Rochani; SARIMAN SARIMAN; Rezky Iriansyah Anugrah; Pramusanto Pramusanto
Indonesian Mining Journal Vol 11, No 2 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 2 June 2008
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (773.383 KB) | DOI: 10.30556/imj.Vol11.No2.2008.590

Abstract

Indonesia has great iron mineral resources, comprising primary iron ore (17 %), iron sand (8 %) and lateritic iron ore (75 %). Nowadays, Indonesia’s primary iron (hematite, magnetite) has not been em- powered yet, due to the scattered area of the resources location. Meanwhile, national iron sand is commonly used for cement industries and its potency has not supported national steel industries yet because of low iron content (45-48 %). However there is an opportunity to be processed by using Ausmelt process technology. At present, lateritic iron ore is being used as coal liquefaction catalyst in the form of limonite, but hydrometallurgy would be a promising solution to beneficiate lateritic iron ore for steel industries.
PRELIMINARY STUDY OF PARTICLE SIZE MEASUREMENT OF FINE PHOSPHATE ROCKS USING DYNAMIC LIGHT SCATTERING METHOD AGUS WAHYUDI; SARIMAN SARIMAN; SITI ROCHANI
Indonesian Mining Journal Vol 14, No 3 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 3 October 2011
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (305.853 KB) | DOI: 10.30556/imj.Vol14.No3.2011.483

Abstract

Particle size measurement is an important role in the utilization of phosphate rocks for nanofertilizer. In this study, the phosphate rocks from Wonosari and Ciamis were milled by planetary ball mill (PBM) into submicron size (0.19 μm). Measurements of the submicron size were conducted using a dynamic light scattering (DLS) method, i.e. iluminating. The milled products were also compared to the milled zeolite and bentonite from the same PBM. There is a relationship between the particle milled size and its chemical composition. The correlation is interpreted as the result of different hardness in minerals content.
PREPARATION OF MESO POROUS SILICA FROM BENTONITE BY ULTRAFINE GRINDING AND SELECTIVE LEACHING Agus wahyudi; SARIMAN SARIMAN; SITI ROCHANI
Indonesian Mining Journal Vol 13, No 1 (2010): INDONESIAN MINING JOURNAL Vol. 13 No. 1 February 2010
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (333.022 KB) | DOI: 10.30556/imj.Vol13.No1.2010.543

Abstract

Preparation of meso porous silica from bentonite had been conducted by ultrafine grinding and leaching. The bentonite was taken from Nanggung, Bogor, West Java; it contains montmorillonite with porous struc- ture. The ultrafine grinding was carried out using planetary ball mill (PBM) in wet condition (wet milling) in methanol. Optimum milling time was reached in 30 hours and it produced 77.4 nm of particle size. The process was continued with selective leaching in sulphuric acid solution to increase the amount of SiO2 from 54.13% to 86.21%, which decreased Al2O3 and Fe2O3 content gradually from 23.09% and 7.33% to 4.96% and 0.89% respectively. The leaching process produced porous silica material with pore size 6.5 nm (meso porous); 278 m2/g of surface area and 0.75 mL/g of pore volume.
PRELIMINARY STUDY OF PARTICLE SIZE MEASUREMENT OF FINE PHOSPHATE ROCKS USING DYNAMIC LIGHT SCATTERING METHOD AGUS WAHYUDI; SARIMAN SARIMAN; SITI ROCHANI
Indonesian Mining Journal Vol 14 No 3 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 3 October 2011
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol14.No3.2011.483

Abstract

Particle size measurement is an important role in the utilization of phosphate rocks for nanofertilizer. In this study, the phosphate rocks from Wonosari and Ciamis were milled by planetary ball mill (PBM) into submicron size (0.19 μm). Measurements of the submicron size were conducted using a dynamic light scattering (DLS) method, i.e. iluminating. The milled products were also compared to the milled zeolite and bentonite from the same PBM. There is a relationship between the particle milled size and its chemical composition. The correlation is interpreted as the result of different hardness in minerals content.
PREPARATION OF MESO POROUS SILICA FROM BENTONITE BY ULTRAFINE GRINDING AND SELECTIVE LEACHING Agus wahyudi; SARIMAN SARIMAN; SITI ROCHANI
Indonesian Mining Journal Vol 13 No 1 (2010): INDONESIAN MINING JOURNAL Vol. 13 No. 1 February 2010
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol13.No1.2010.543

Abstract

Preparation of meso porous silica from bentonite had been conducted by ultrafine grinding and leaching. The bentonite was taken from Nanggung, Bogor, West Java; it contains montmorillonite with porous struc- ture. The ultrafine grinding was carried out using planetary ball mill (PBM) in wet condition (wet milling) in methanol. Optimum milling time was reached in 30 hours and it produced 77.4 nm of particle size. The process was continued with selective leaching in sulphuric acid solution to increase the amount of SiO2 from 54.13% to 86.21%, which decreased Al2O3 and Fe2O3 content gradually from 23.09% and 7.33% to 4.96% and 0.89% respectively. The leaching process produced porous silica material with pore size 6.5 nm (meso porous); 278 m2/g of surface area and 0.75 mL/g of pore volume.
THE CURRENT STATUS OF IRON MINERALS IN INDONESIA Siti Rochani; SARIMAN SARIMAN; Rezky Iriansyah Anugrah; Pramusanto Pramusanto
Indonesian Mining Journal Vol 11 No 2 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 2 June 2008
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol11.No2.2008.590

Abstract

Indonesia has great iron mineral resources, comprising primary iron ore (17 %), iron sand (8 %) and lateritic iron ore (75 %). Nowadays, Indonesia’s primary iron (hematite, magnetite) has not been em- powered yet, due to the scattered area of the resources location. Meanwhile, national iron sand is commonly used for cement industries and its potency has not supported national steel industries yet because of low iron content (45-48 %). However there is an opportunity to be processed by using Ausmelt process technology. At present, lateritic iron ore is being used as coal liquefaction catalyst in the form of limonite, but hydrometallurgy would be a promising solution to beneficiate lateritic iron ore for steel industries.
Co-Authors AGUS Wahyudi Pramusanto Pramusanto Rezky Iriansyah Anugrah SARIMAN SARIMAN