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This study aims to enhance nickel and cobalt recovery from lateritic ore using atmospheric acid leaching.

Pilot-scale optimization of atmospheric acid leaching for enhanced nickel and cobalt recovery from laterite ore

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Pilot-scale trial optimizes nickel and cobalt recovery from lateritic ore, suggesting an effective leaching alternative.

This study aims to enhance nickel and cobalt recovery from lateritic ore using atmospheric acid leaching.
Conducted pilot-scale experiments with atmospheric sulfuric acid leaching.
Introduced sodium sulfite as a reducing agent to improve metal dissolution.
Utilized factorial experimental design and central composite design to identify key variables.
Achieved 94.13% nickel recovery and approximately 100% cobalt recovery under optimized conditions.
Increased nickel recovery by 33.7% with leached liquor recirculation (8 h) versus no recirculation (2 h).
Confirmed reproducibility with deviations lower than 5% at pilot scale.

Nascimento et al. (2026) studied this question.

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