研究和优化不同工艺条件下硫酸(3.0～5.5mol/L)浸出回收Ni和Al的工艺.浸出实验表明,在H2SO4浓度5.5mol/L、反应时间4h、固液比0.2g/mL、温度358K、粒径<100μm、搅拌速度200～250r/min、催化剂用量5.0g的条件下,可提取98.5％的NiO和40.7％的Al2O3.浸出液中的Al用1.4mol/L KOH选择性结晶分离,Ni用0.3mol/L H2C2O4选择性沉淀分离.此法可回收约97.9％的NiO,纯度达98.3％;约25％的Al2O3以明矾(纯度为99％)形式回收,14.7％的Al2O3以Al?K?C2O4?SO4盐的形式回收.研究结果表明,硫酸是一种合适的选择性浸出溶剂,而且可以从硫酸盐溶液中选择性结晶出明矾.TG-DTA/DTG和XRD表征研究证明,本工艺可以有效地提取和回收镍和铝.“,”An attempt has been made to investigate and optimize the recovery of Ni and Al through sulphuric acid (3.0?5.5 mol/L) leaching under different operating conditions. From the leaching experiments, it was possible to extract 98.5％of NiO and 40.7％of Al2O3 under the conditions of 5.5 mol/L H2SO4, reaction time of 4 h, solid-to-liquid ratio 0.2 g/mL, temperature of 358 K, particle size<100μm, 200?250 r/min with 5.0 g catalyst dosage. The leached liquor Al was separated by selective crystallization using 1.4 mol/L KOH and Ni was separated by selective precipitation using 0.3 mol/L H2C2O4. From the studies, it is possible to recover around 97.9％of NiO having 98.3％purity, around 25％of Al2O3 was also recovered as alum-(K) having 99％purity and 14.7％of Al2O3 as a salt of Al?K?C2O4?SO4.Sulphuric acid was found to be a suitable leaching agent for selective leaching and it was also observed that alum-(K) can be selectively crystallized from sulphate solutions. The study also indicated the effective extraction and recovery of nickel and aluminium which were well supported by characterization studies using TG-DTA/DTG and XRD techniques.