Selective recovery of chromium from ferronickel slag via alkaline roasting followed by water leaching

Foquan Gu, Yuanbo Zhang, Zhiwei Peng, Zijian Su, Huimin Tang, Weiguang Tian, Guoshen Liang, Joonho Lee, Mingjun Rao, Guanghui Li, Tao Jiang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Chromium was selectively recovered from ferronickel slag by roasting the slag with addition of Na 2 O 2 , followed by water leaching. The thermodynamic analysis revealed that in the presence of Na 2 O 2 at appropriate temperatures, the Cr 2 O 3 in the ferronickel slag can be converted to NaCrO 2 , instead of Na 2 CrO 4 , which prevents the formation of highly toxic Cr (VI). The experimental results confirmed that under the optimal alkaline roasting and water leaching conditions of the mass ratio of ferronickel slag to Na 2 O 2 of 1, roasting temperature of 600 °C, roasting time of 1 h, leaching temperature of 50 °C, leaching time of 1 h, and liquid-to-solid ratio of 10 mL/g, 92.33% of Cr was leached with 64.28% of Na and 11.16% of Si and only 0.06 wt % Cr was left in the leaching residue. The high leaching percentage of Cr was a result of the transformation of Cr 2 O 3 in the ferronickel slag to NaCrO 2 with a loose structure during alkaline roasting that was beneficial to water dissolution. Compared to the traditional alkaline roasting process, the proposed more environmentally friendly method did not produce toxic Cr (VI) during recovery of chromium and the resulting residue has potential to be used as a good construction material.

Original languageEnglish
Pages (from-to)83-91
Number of pages9
JournalJournal of Hazardous Materials
DOIs
Publication statusPublished - 2019 Jul 15

Fingerprint

Chromium
slag
Slags
Leaching
chromium
leaching
Recovery
Water
Poisons
Temperature
water
Thermodynamics
temperature
ferronickel
Dissolution
thermodynamics
dissolution
liquid
Liquids
chromium hexavalent ion

Keywords

  • Alkaline roasting
  • Cr (III)
  • Ferronickel slag
  • Selective recovery
  • Water leaching

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Selective recovery of chromium from ferronickel slag via alkaline roasting followed by water leaching. / Gu, Foquan; Zhang, Yuanbo; Peng, Zhiwei; Su, Zijian; Tang, Huimin; Tian, Weiguang; Liang, Guoshen; Lee, Joonho; Rao, Mingjun; Li, Guanghui; Jiang, Tao.

In: Journal of Hazardous Materials, 15.07.2019, p. 83-91.

Research output: Contribution to journalArticle

Gu, Foquan ; Zhang, Yuanbo ; Peng, Zhiwei ; Su, Zijian ; Tang, Huimin ; Tian, Weiguang ; Liang, Guoshen ; Lee, Joonho ; Rao, Mingjun ; Li, Guanghui ; Jiang, Tao. / Selective recovery of chromium from ferronickel slag via alkaline roasting followed by water leaching. In: Journal of Hazardous Materials. 2019 ; pp. 83-91.
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AU - Tang, Huimin

AU - Tian, Weiguang

AU - Liang, Guoshen

AU - Lee, Joonho

AU - Rao, Mingjun

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AU - Jiang, Tao

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AB - Chromium was selectively recovered from ferronickel slag by roasting the slag with addition of Na 2 O 2 , followed by water leaching. The thermodynamic analysis revealed that in the presence of Na 2 O 2 at appropriate temperatures, the Cr 2 O 3 in the ferronickel slag can be converted to NaCrO 2 , instead of Na 2 CrO 4 , which prevents the formation of highly toxic Cr (VI). The experimental results confirmed that under the optimal alkaline roasting and water leaching conditions of the mass ratio of ferronickel slag to Na 2 O 2 of 1, roasting temperature of 600 °C, roasting time of 1 h, leaching temperature of 50 °C, leaching time of 1 h, and liquid-to-solid ratio of 10 mL/g, 92.33% of Cr was leached with 64.28% of Na and 11.16% of Si and only 0.06 wt % Cr was left in the leaching residue. The high leaching percentage of Cr was a result of the transformation of Cr 2 O 3 in the ferronickel slag to NaCrO 2 with a loose structure during alkaline roasting that was beneficial to water dissolution. Compared to the traditional alkaline roasting process, the proposed more environmentally friendly method did not produce toxic Cr (VI) during recovery of chromium and the resulting residue has potential to be used as a good construction material.

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