Abstract
Iron control in the atmospheric acid leaching (AL) of nickel laterite was evaluated in this study. The aim was to decrease acid consumption and iron dissolution by iron precipitation during nickel leaching. The combined acid leaching and iron precipitation process involves direct acid leaching of the limonite type of laterite followed by a simultaneous iron precipitation and nickel leaching step. Iron precipitation as jarosite is carried out by using nickel containing silicate laterite for neutralization. Acid is generated in the jarosite precipitation reaction, and it dissolves nickel and other metals like magnesium from the silicate laterite. Leaching tests were carried out using three laterite samples from the Agios Ioannis, Evia Island, and Kastoria mines in Greece. Relatively low acid consumption was achieved during the combined precipitation and acid leaching tests. The acid consumption was approximately 0.4 kg acid per kg laterite, whereas the acid consumption in direct acid leaching of the same laterite samples was approximately 0.6-0.8 kg acid per kg laterite. Iron dissolution was only 1.5-3% during the combined precipitation and acid leaching tests, whereas in direct acid leaching it was 15-30% with the Agios Ioannis and Evia Island samples and 80% with the Kastoria sample.
| Original language | English |
|---|---|
| Article number | 404 |
| Number of pages | 13 |
| Journal | Minerals |
| Volume | 9 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - Jul 2019 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- Jarosite
- Laterite
- Leaching
- Nickel
- Precipitation
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Iron control in atmospheric acid laterite leaching. / Miettinen, Ville (Corresponding Author); Mäkinen, Jarno; Kolehmainen, Eero; Kravtsov, Tero; Rintala, Lotta.
In: Minerals, Vol. 9, No. 7, 404, 07.2019.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Iron control in atmospheric acid laterite leaching
AU - Miettinen, Ville
AU - Mäkinen, Jarno
AU - Kolehmainen, Eero
AU - Kravtsov, Tero
AU - Rintala, Lotta
PY - 2019/7
Y1 - 2019/7
N2 - Iron control in the atmospheric acid leaching (AL) of nickel laterite was evaluated in this study. The aim was to decrease acid consumption and iron dissolution by iron precipitation during nickel leaching. The combined acid leaching and iron precipitation process involves direct acid leaching of the limonite type of laterite followed by a simultaneous iron precipitation and nickel leaching step. Iron precipitation as jarosite is carried out by using nickel containing silicate laterite for neutralization. Acid is generated in the jarosite precipitation reaction, and it dissolves nickel and other metals like magnesium from the silicate laterite. Leaching tests were carried out using three laterite samples from the Agios Ioannis, Evia Island, and Kastoria mines in Greece. Relatively low acid consumption was achieved during the combined precipitation and acid leaching tests. The acid consumption was approximately 0.4 kg acid per kg laterite, whereas the acid consumption in direct acid leaching of the same laterite samples was approximately 0.6-0.8 kg acid per kg laterite. Iron dissolution was only 1.5-3% during the combined precipitation and acid leaching tests, whereas in direct acid leaching it was 15-30% with the Agios Ioannis and Evia Island samples and 80% with the Kastoria sample.
AB - Iron control in the atmospheric acid leaching (AL) of nickel laterite was evaluated in this study. The aim was to decrease acid consumption and iron dissolution by iron precipitation during nickel leaching. The combined acid leaching and iron precipitation process involves direct acid leaching of the limonite type of laterite followed by a simultaneous iron precipitation and nickel leaching step. Iron precipitation as jarosite is carried out by using nickel containing silicate laterite for neutralization. Acid is generated in the jarosite precipitation reaction, and it dissolves nickel and other metals like magnesium from the silicate laterite. Leaching tests were carried out using three laterite samples from the Agios Ioannis, Evia Island, and Kastoria mines in Greece. Relatively low acid consumption was achieved during the combined precipitation and acid leaching tests. The acid consumption was approximately 0.4 kg acid per kg laterite, whereas the acid consumption in direct acid leaching of the same laterite samples was approximately 0.6-0.8 kg acid per kg laterite. Iron dissolution was only 1.5-3% during the combined precipitation and acid leaching tests, whereas in direct acid leaching it was 15-30% with the Agios Ioannis and Evia Island samples and 80% with the Kastoria sample.
KW - Jarosite
KW - Laterite
KW - Leaching
KW - Nickel
KW - Precipitation
UR - http://www.scopus.com/inward/record.url?scp=85070746995&partnerID=8YFLogxK
U2 - 10.3390/min9070404
DO - 10.3390/min9070404
M3 - Article
AN - SCOPUS:85070746995
VL - 9
JO - Minerals
JF - Minerals
SN - 2075-163X
IS - 7
M1 - 404
ER -