Ore Type | Reductant | Maximum Ni Recovery (%) | Temp. of Maximum Ni Recovery (˚C) | Ni Grade At Maximum (%) | Optimum Observed | Reference |
Limonitic | CO/CO2 | ̴100 | 550 | N/A | yes | [29] |
Limonitic | H2/H2O | ̴100 | 550 | N/A | N/A | [29] |
Limonitic | CO2/H2 | ̴100 | 700 - 800 | 60 | yes | [30] |
Saprolitic | CO/CO2 | 82 | 700 | N/A | yes | [29] |
Saprolitic | CO/CO2 | 78 | 900 | N/A | yes | [29] |
Saprolitic | H2/H2O | 85 | 850 | N/A | N/A | [29] |
Saprolitic | CO/CO2 | 85 | 740 | 41 | yes | [31] |
Saprolitic | CO | 75 | 800 | N/A | yes | [32] |
Saprolitic | C (anthracite) | 84 | 1000 | N/A | no | [32] |