Environmental Friendly Approach: Atmospheric and High-Pressure Acid Leaching Studies, Low-Grade Laterites Nickel Processing | ||
| Journal of Mining and Environment | ||
| مقاله 24، دوره 15، شماره 4، دی 2024، صفحه 1591-1606 اصل مقاله (9.06 M) | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22044/jme.2024.14230.2656 | ||
| نویسندگان | ||
| Ahmad Abbasi Gharaei1؛ Bahram Rezai* 2؛ Hadi Hamidian Shormasti3 | ||
| 1Department of Mining Engineering, Science and Research Branch of Islamic Azad University, Tehran, Iran | ||
| 2Department of Mining Engineering, Amirkabir University of Technology, Tehran, Iran. | ||
| 3Department of Mining Engineering, Qaem Shahr Branch Islamic Azad University, Qaem Shahr, Iran | ||
| چکیده | ||
| This paper examines the performance of Atmospheric Leaching (AL) and High-Pressure Acid Leaching (HPAL) on nickel laterite, classified as limonite. The study, conducted on a laboratory scale, involved temperatures of 35-95°C for AL and 220-250°C for HPAL. Nickel and cobalt contents were found to be 0.7% and 0.04%, respectively. AL achieved an 89% yield of Al with a pH of 0.2 and a 14-hour leaching time, while nickel and iron recoveries reached 92% and 87% after 20 hours, with an acid consumption of 1.2 kg H2SO4 per 100 kg laterite (dry) at pH 0.2. Leaching experiments at 220-250°C for 2 hours showed similar nickel recovery rates, indicating no improvement beyond 240°C. Hematite, a stable compound associated with nickel, hindered its release during HPAL due to its resistance to leaching. Nickel yields remained around 90% in both AL and HPAL tests. Iron behavior differed significantly between the two methods, with HPAL dissolving iron initially but transforming it into hematite in situ, leading to lower net acid consumption compared to AL. The leaching mechanism for iron oxides followed empirical power law kinetics of order 1.5 with activation energies of 36.23 and 25.09 kJ/mol for Ni and Fe, respectively. | ||
| کلیدواژهها | ||
| Laterites؛ Nickel؛ Atmospheric leaching؛ HPAL؛ Environmental friendly | ||
| مراجع | ||
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