Nickel and aluminium recovery from spent reforming catalyst through selective leaching,crystallization and precipitation  

通过选择性浸出、结晶和沉积回收废重整催化剂中的镍和铝

作　　者：Naga Raju BATTI N.R.MANDRE 

机构地区：[1]Department of QC&SSP Audit,Projects&Development India Limited(Govt.of India U/T),PDIL Bhawan,A-14,Sector-1,Noida,Gautam Buddh Nagar,U.P–201301,India [2]Department of Fuel,Minerals and Metallurgical Engineering,Indian Institute of Technology(Indian School of Mines),Dhanbad,Jharkhand–826004,India

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第1期345-353,共9页中国有色金属学报（英文版）

摘　　要：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 Al_(2)O_(3)under the conditions of 5.5 mol/L H_(2)SO_(4),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 H_(2)C_(2)O_(4).From the studies,it is possible to recover around 97.9%of NiO having 98.3%purity,around 25%of Al_(2)O_(3)was also recovered as alum-(K)having 99%purity and 14.7%of Al_(2)O_(3)as a salt of Al-K-C_(2)O_(4)-SO_(4).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.研究和优化不同工艺条件下硫酸(3.0~5.5 mol/L)浸出回收Ni和Al的工艺。浸出实验表明,在H_(2)SO_(4)浓度5.5 mol/L、反应时间4 h、固液比0.2 g/mL、温度358 K、粒径<100μm、搅拌速度200~250 r/min、催化剂用量5.0 g的条件下,可提取98.5%的NiO和40.7%的Al_(2)O_(3)。浸出液中的Al用1.4 mol/L KOH选择性结晶分离,Ni用0.3 mol/L H_(2)C_(2)O_(4)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Al_(2)O_(3)以明矾(纯度为99%)形式回收,14.7%的Al_(2)O_(3)以Al-K-C_(2)O_(4)-SO_(4)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。

关 键 词：spent catalyst LEACHING PRECIPITATION CRYSTALLIZATION NICKEL aluminium 

分 类 号：X705[环境科学与工程—环境工程] TF815[冶金工程—有色金属冶金] TF821