Garuda - Garba Rujukan Digital

Nuryadi Saleh

Research and Development Centre for Mineral and Coal Technology

Author-ID : 3950426

Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology

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PREPARATION OF METALLIC CERIUM BY METALLOTHERMIC REDUCTION USING CERIUM OXIDE AS RAW MATERIAL Nuryadi Saleh
Indonesian Mining Journal Vol 18, No 2 (2015): INDONESIAN MINING JOURNAL Vol. 18 No. 2 June 2015
Publisher : Puslitbang tekMIRA

Cerium is one of the rare earth elements (REE) which many are found in rare earth minerals of monazite. Cerium is widely used for metal alloys in stainless steel, permanent magnets and automotive industries. In Indonesia, researchs for cerium extraction from such minerals of monazite to procure metallic cerium have not been inten- sively carried out, although cerium is potentially promising as raw material for alloying. The present research aims to study the conditions of cerium oxide (CeO2) reduction process to yield metallic cerium (Ce). Cerium oxide reduction process was performed by a metallothermic method using a reductant of magnesium metallic powder and CaCl2 as a flux. The parameters studied during the experiments were the quantity of the reductant, the composition of the flux and temperature of the process. The best result of the experimental process obtains the yield of metallic cerium about 50%, while the metal purity is 91% Ce. The process took place under condi- tions of that the oxide sample and reductant ratio were 1 : 1, the flux addition was 1%, with temperature of the process at 1200°C for 3 hours.

BENEFICIATION OF BOREHOLE IRON ORE SAMPLES THROUGH MULTI-STAGES MAGNETIC SEPARATION Nuryadi Saleh; Nngurah Ardha
Indonesian Mining Journal Vol 18, No 1 (2015): INDONESIAN MINING JOURNAL Vol. 18 No. 1 February 2015
Publisher : Puslitbang tekMIRA

This study investigates the effectiveness of magnetic concentration techniques for the beneficiation of borehole samples of Arasuko - West Sumatera iron ore. It is a low-grade type of ore sample (±35% Fe) with high silica and calcium content (±36%). Based on the fact, that there are appreciable differences in magnetic susceptibility between the desired iron minerals and the gangue minerals, hence, it was suggested that multi-stages magnetic separation may be useful to concentrate this type of ore. Because of the fine dissemination of the iron minerals and the most abundant gangue mineral, the particles size of ore was set at 80% passing 150 meshes. Rougher tests of magnetic separation produced concentrates with iron content of about 58.2% Fe; the tailing of rougher stage was then scavenged using higher magnetic intensity. Further, the rough and scavenged concentrates were mixed and fed into a cleaner stage with low magnetic intensity. Results indicate that the final iron concen- trate assaying of 68.1% Fe at a recovery of about 80% is achieved and reckoned as an iron premium-grade concentrate.

STUDY ON BASICITY IN DIRECT REDUCED IRON SMELTING Nuryadi Saleh; Siti Rochani
Indonesian Mining Journal Vol 18, No 2 (2015): INDONESIAN MINING JOURNAL Vol. 18 No. 2 June 2015
Publisher : Puslitbang tekMIRA

Pig iron as raw material for steel production, can be prepared by smelting a Direct Reduced Iron (DRI)/sponge iron. The smelting process needs optimum conditions to obtain such a high recovery likes basicity, which measures the ratio of alkalinity or acidity by adding the exact quantity of flux (CaCO3) and quartz sand to input materials to generate the reduction process running well. In this study, smelting process was conducted using DRI sample mixed with varied flux (CaCO3), quartz sand and coal. Then a mixture was fed to a resistance furnace. The reduction process was carried out at a temperature of 1600°C, for 1-2 hour. Pig iron as product and slag were analyzed to obtain its chemical composition. Afterward, recovery products was calculated. The results showed that the best conditions in these experiments were achieved at 1.18 basicity with pig iron recovery was reached up to 95.79%, contented of 95.84% Fe, 3.52% C and 0.0024% SiO2. These data of this study can be used as reference of flux (limestone), quartz sand and carbon addition as input to resistance furnace in smelting process of sponge iron on a larger scale.

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Journal : Indonesian Mining Journal