Sulfur Removal and Iron Extraction from Natrojarosite Residue of Laterite Nickel Ore Processing by Reduction Roasting

An alternative laterite nickel ore processing using sulfuric acid as a leaching agent to produce class 1 raw material for electric vehicle batteries produces natrojarosite residue by-product during the precipitation of iron and aluminum step. The contained high sulfur, which is challenging utilize an source steel manufacturing since sulfur can contaminate product. This study focuses on elimination extraction from natrojarosite. was roasted removal isothermally at different temperatures ranging 500 until 1100 °C 4 h. Roasting resulted decrease in content 12.18% 3.81% increase 16.23% 28.54%. released roasting can, principle, be recirculated plant reused plant. unroasted residues were then reduced by coconut shell charcoal temperature range 1000–1400 °C. results showed that metallic could obtained both 1200 higher. oxide phase significantly higher than residue. However, did not influence metal phase. less 1.2%. result indicated reduction carried out simultaneously one stage where carbonaceous or