Xiaohua Peng,Xin Jin,Yong Zhen,Bo Yang,Chang Wei,Xingbin Li,Zhigan Deng,Minting Li
This study introduces a novel synergistic leaching process for ferronickel powder and high nickel matte, enabling the atmospheric leaching and the hematite precipitation process to mitigate carbon emissions associated with the treatment of Ni laterite. The results indicated that following seven cycles of synergistic leaching, the Ni2+ concentration in the solution exceeded 80 g/L, compared with the 15 cycles required for non-synergistic leaching. Optimal leaching conditions included a temperature range of 80°C−95°C, a stirring speed of 300 rpm, an initial H2SO4 concentration of 100 g/L, and a reaction time of 8 h, maintaining a final pH of 3.5−4.5, and an excess of ferronickel powder. Leaching successfully extracted Ni and Fe from ferronickel powder, with Cu2+ in the solution being reduced and enriched in the leaching residue. For the hematite precipitation process, optimal conditions involved a temperature of 200°C, a stirring speed of 500 rpm, a reaction time of 3 h, and an addition of 20 g/L of high Ni matte. The Fe removal efficiency exceeded 86%, resulting in hematite products that contained 61.15% Fe, 0.60% Ni and 1.48% S. These products can be commercially utilised, either sold to cement plants or utilized as raw materials for ironmaking.
Massive spent lithium-ion batteries will peak soon, creating energy, environment, economy, and technology challenges and key metal supply burdens in all resource-relevant industries. Here, we develop a universal energy-effective, sustainable, and easily modularized recycling strategy to retrieve transition metals and lithium from spent cathodes (LiCoO 2 and LiNi 0.8 Co 0.1 Mn 0.1 O 2 ) via a high-capacity cooperative leaching process. The high-capacity leaching with acid-free sustainable agents is enabled by strong coordination using green deep eutectic solvents and synergistic strong ligand molecules through a concurrent reduction-dissolution and direct coordination mechanism. Importantly, the Al foil current collector, binder, and carbon additives remain non-dissolved under our mild treatment condition and can be easily filtered out, which is vastly more advantageous than conventional hydro/pyrometallurgy processes that involve complicated purification. Furthermore, as a demonstration of high-value applications, we transform the leached solution to high-quality single or ternary atomic catalysts and LiCl, completing the loop for recycling spent battery cathodes.
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