|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deriving Value from Challenging Waste Materials: Recycling and Sustainability Joint Session
||Chromium Removal from Iron-rich Waste Generated during Processing Lateritic Nickel Ores
||Hong Nguyen Vu, Petr Dvorak, Tomas Frydl, Jana Selucka, Petra Starkova
|On-Site Speaker (Planned)
||Hong Nguyen Vu
Waste, generated during high pressure leaching of lateritic nickel ores, contains about 50% of iron in form of magnetite but high chromium content (~3%) does not allow its extensive utilization as the raw material for pig iron production in blast furnace. The chromium removal from the waste was carried out by two methods: 1) oxidative alkali roasting with NaOH and/or Na2CO3, followed by water leaching and 2) oxidative leaching in KOH sub-molten salts solutions. The results show that about 90.1% of Cr was removed when the waste was roasted at 900oC for 3 hours with 33.1 wt.% of NaOH. The removal of 88.2 % of Cr was achieved if the waste was roasted at 900oC for 3 hours with 40 wt. % of Na2CO3. About 70 % of Cr was removed if the waste was leached at 190oC in 75 wt.% KOH for 8 hours.