Author ORCID Identifier

Eni Febriana: 0000-0002-1816-9598

Muhamad Irham Mulyadi: 0009-0007-6082-8044

Wahyu Mayangsari: 0000-0002-7941-5510

Januar Irawan: 0000-0002-9687-5869

Iwan Setiawan: 0000-0002-7164-1599

Ahmad Maksum: 0000-0003-1800-9137

Florentinus Firdiyono: 0000-0003-4686-1626

Soesaptri Oediyani: 0000-0003-1059-4597

Agus Budi Prasetyo: 0000-0001-7514-4648

J W Soedarsono: 0000-0001-6051-2866


This study highlights the effectiveness of employing double-acting liberation to release Ni and Co from the complex phases of the low-grade nickel laterite. It includes the addition of concentrated sulphuric acid and NaF as well as the heat treatment prior to roasting and leaching processes to improve the destruction of the complex phases contained. The finding describes that dehydration of iron sulfate and decomposition of the lizardite at a lower temperature, 270°C, were occurred in the pre-treatment process, followed by hematite formation in the roasting process. It subsequently accelerated Ni and Co extraction in the pregnant solution and omitted Fe as the water-insoluble hematite in the residue when the leaching process was employed. The optimum leaching percentages of nickel and cobalt are 71.3% and 98.8%, serially, and were obtained at a roasting temperature of 700°C for 30 minutes with the addition of 3 wt.% sodium fluoride. This research provides essential contributions to the optimization of decomposition process for complex phases of in the low-grade nickel laterite at a lower temperature and to upsurge leaching percentage of Ni and Co by strictly suppressing Fe dissolution.

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Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.