About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Energy Technologies and CO2 Management: Resource Efficient Processes
|
| Presentation Title |
Na2CO3 Metathesis-Assisted Alkali Leaching for Enhanced Aluminum Recovery from HPAL Second-Stage Fe–Al Removal Residue |
| Author(s) |
Muhammad Harza Arbaha Kalijaga, Akhsan Fakhrurozi, Wei Liu, Leiting Shen |
| On-Site Speaker (Planned) |
Muhammad Harza Arbaha Kalijaga |
| Abstract Scope |
Depleting high-grade bauxite reserves and rising demand for catalyst-grade γ-Al2O3 have motivated aluminum recovery from secondary resources. The second-stage Fe–Al removal residue from high-pressure acid leaching (HPAL) of nickel laterite ores is a promising feedstock, but its calcium sulfate (CaSO4) content promotes katoite formation during alkali leaching, thus suppressing aluminum extraction and introducing sulfur contamination. This study proposes an integrated route combining wet sieving to enrich aluminum in the fine fraction, Na2CO3 wet-metathesis desulfurization to convert CaSO4 to inert calcium carbonate while releasing sulfate for washing, and two-stage NaOH alkali leaching with second-stage liquor recycled to the first stage. The pregnant leach solution undergoes CO2 precipitation to yield Al(OH)3 for calcination to γ-Al2O3, while the resulting Na2CO3-rich liquor is recycled to drive desulfurization, closing the reagent loop. The route is expected to improve aluminum recovery, suppress sulfur transfer, and reduce reagent consumption for sustainable alumina production. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Recycling and Secondary Recovery, Aluminum, Hydrometallurgy |