氧化亚铁硫杆菌对FCC废催化剂金属的生物淋滤  

Bioleaching of Heavy Metals from Spent FCC Refinery Catalyst by Acidithiobacillus ferrooxidans

作　　者：李玲玲 王晨 王曰杰 LI Lingling;WANG Chen;WANG Yuejie(Sinopec Research Institute of Safety Engineering Co.,Ltd.,Qingdao 266071,China)

机构地区：[1]中石化安全工程研究院有限公司,山东青岛266071

出　　处：《环境科学与技术》2021年第10期107-112,共6页Environmental Science & Technology

基　　金：中国石化科技部项目(A-531)。

摘　　要：该文旨在研究氧化亚铁硫杆菌对FCC废催化剂重金属的生物淋滤性能和淋滤动力学。评价了不同废催化剂浓度下氧化亚铁硫杆菌对FCC废催化剂中镍和钒的去除效果,分别采用化学反应模型和产物层扩散模型拟合了镍和钒的浸出动力学过程。结果表明,FCC废催化剂浓度为1%时,镍和钒的浸出效率达到为43.2%和49.3%,高于2.5%浓度下的37.4%和36.9%,较高的FCC废催化剂加入量抑制了细菌的生物淋滤过程;动力学拟合结果表明,产物层扩散模型更适用于废催化剂金属的生物淋滤浸出过程,重金属的扩散过程是生物淋滤的限速步骤。The aim of this study was to research the bioleaching performance of Acidithiobacillus ferrooxidans(A. ferrooxidans) to heavy metals in spent FCC refinery catalyst and leaching kinetics of metals. The removal efficiency of A.ferrooxidans on nickel and vanadium of spent FCC catalyst was evaluated under different pulp density of spent catalyst. The leaching kinetics of nickel and vanadium were fitted by chemical reaction model and product layer diffusion model,respectively. The results showed that the bioleaching efficiency of Ni and V reached 43.2% and 49.3% when the pulp density of spent FCC catalyst was 1%, which was higher than that of 37.4% and 36.9% under 2.5% pulp density. High pulp density of spent FCC catalyst inhibited the bioleaching activity of A. ferrooxidans. Kinetic fitting results show that the product layer diffusion model is more suitable for the bioleaching process of metals in spent FCC catalyst, and the diffusion process of metals is the rate-limiting step of bioleaching.

关 键 词：氧化亚铁硫杆菌 FCC废催化剂 生物淋滤 重金属去除 

分 类 号：X742[环境科学与工程—环境工程]