这项研究的重点是新兴的废物来源的影响,磷酸铁锂(LFP)正极材料,关于目前占主导地位的工业电池废物的湿法冶金回收,这些废物富含过渡金属(Ni,Co,Mn,和李)。LFP用量的影响,初始酸度,在硫酸(H2SO4)浸出中研究了LFP还原剂添加的时间(t=3h,T=60°C,ω=300rpm)。结果表明,LFP的加入增加了过渡金属的提取和酸消耗。Further,由于Fe2+的存在增加,氧化还原电位降低。初始酸度为2.0mol/LH2SO4,酸消耗为1.3kgH2SO4/kg黑色质量,为实现高浸出率提供了最佳条件(Co=100%,Ni=87.6%,Mn=91.1%,Li=100%)并创建工艺溶液(Co8.8g/L,Ni13.8g/L,Li6.7g/L,Mn7.6g/L,P12.1g/L)有利于后续湿法冶金加工。此外,当t=2小时后加入H2O2时,由于高浓度的Fe2+和Mn2+分解,H2O2的总效率降低,导致最终电池金属提取水平仅略有增加。
This study focuses on the effect of an emerging source of waste, lithium iron phosphate (LFP) cathode materials, on the hydrometallurgical recycling of the currently dominant industrial battery waste that is rich in transition metals (Ni, Co, Mn, and Li). The effects of the dosage of LFP, initial acidity, and timing of LFP reductant addition were investigated in sulfuric acid (H2SO4)
leaching (t = 3 h, T = 60 °C, ω = 300 rpm). The results showed that addition of LFP increased both transition metal extraction and acid consumption. Further, the redox potential was lowered due to the increased presence of Fe2+. An initial acidity of 2.0 mol/L H2SO4 with acid consumption of 1.3 kg H2SO4/kg black mass provided optimal conditions for achieving a high
leaching yield (Co = 100%, Ni = 87.6%, Mn = 91.1%, Li = 100%) and creating process solutions (Co 8.8 g/L, Ni 13.8 g/L, Li 6.7 g/L, Mn 7.6 g/L, P 12.1 g/L) favorable for subsequent hydrometallurgical processing. Additionally, the overall efficiency of H2O2 decreased due to its decomposition by high concentrations of Fe2+ and Mn2+ when H2O2 was added after t = 2 h, leading to only a minor increase in final battery metals extraction levels.