A PROCESS FOR EXTRACTION OF NICKEL FROM LOW GRADE CHROMITE ORE

The present invention is a process for the extraction of nickel from low-grade chromite ore containing 0.6 to 0.9 % nickel, said process comprises of crushing, drying and grinding of low grade Chromite Ore to obtain +100 to -400 mesh B.S.S. with 85% -200 mesh B.S.S., subjecting the crushed ore to re...

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Hauptverfasser:	ASHUTOSH, UGLE, ANAND, SASHI, BHATTACHARYA, INDIRA, NARAYAN, DATTA, PARTHASARATHI, BEHERA, SNEHASIS, TRIPATHY, ANIL, KANTA, PRASAD, KODLI HIRANYA VARNA, DAS, SUDIPTA, RAO, KARNAM, SRINIVAS, MURTHY, B., V. RAMAN, SANJAY, KALI, RAO, KATARAM, RAJESWARA, BHOI, BHAGYADHAR, DAS, SUBIR, SIMHA, HARI, DAS, RADHANATH, PRASAD, SUBBAIAH, TONDEPU, PARLIKAR, RAMCHANDRA, NAGESH, YUGANDHAR, GAJULA, VENKATA, GHOSH, MALAY, KUMAR
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMISTRY FERROUS OR NON-FERROUS ALLOYS METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The present invention is a process for the extraction of nickel from low-grade chromite ore containing 0.6 to 0.9 % nickel, said process comprises of crushing, drying and grinding of low grade Chromite Ore to obtain +100 to -400 mesh B.S.S. with 85% -200 mesh B.S.S., subjecting the crushed ore to reduction-roasting with or without pre-mixing of oil, leaching the reduced material in an ammonia-ammonium carbonate solution using oxygen or compressed air at elevated pressure of 0.2 to 1.5 kgs/cm , precipitating the dissolved nickel as basic nickel carbonate and co-precipitating cobalt and recovering ammonia as well as carbon dioxide for recycle and obtaining a magnetic fraction through a wet magnetic separation technique which is suitable for use in low phosphorous iron production.