废旧高温合金中硫酸浸出镍钴的动力学研究  

Kinetics of Nickel and Cobalt Leaching from Waste Superalloys with Sulfuric Acid

作　　者：行卫东[1] 范兴祥[1,2,3] 董海刚[1,2,3] 吴跃东[1] 付光强[1] 刘杨[1] 

机构地区：[1]昆明贵金属研究所,云南昆明6501062 [2]贵研铂业股份有限公司,云南昆明6501063 [3]稀贵金属综合利用新技术国家重点实验室,云南昆明650106

出　　处：《稀有金属》2014年第4期674-679,共6页Chinese Journal of Rare Metals

基　　金：国家科技部高技术研究发展"863计划"项目(2012AA063204)资助

摘　　要：以废旧高温合金为研究对象,采用常压硫酸浸出回收镍钴,并主要针对硫酸浸出废旧高温合金中镍钴过程的动力学进行研究,实验条件为液固比400∶1,硫酸浓度10%～25%,温度为55～75℃。研究结果表明：物料粒度、硫酸浓度、反应温度等因素对镍钴浸出率有较大的影响,同时确定了废旧高温合金浸出镍钴的过程属于典型的多相液-固区域反应模型,在实验条件范围内,其相应的动力学方程可以用1-2/3a-（1-a）2/3=Kpt来表示,硫酸浸出镍和钴的表观活化能分别为13.37和21.59 kJ·mol-1,且其反应过程受内扩散控制。从废旧高温合金中浸出镍钴动力学的研究为以后工业实践中处理回收废旧高温合金提供一定的借鉴。The kinetics behavior of nickel and cobalt leaching from waste superalloys with sulfuric acid was investigated. The kinetics experiments were carried out with the ratio of liquid to solid of 400： 1, the acid concentration of from 10% to 25% （ volume fraction） and the temperature of from 55 to 75 ℃. The results showed that the apparent activation energy of nickel and cobalt was 13.37 and 21.59 kJ·mol^-1, respectively. This indicated that the dissolution kinetics followed a shrinking core model with inter-diffusion of nickel, cobalt and sulfate ions through the porous region of alloying layer in the rate determining step. The kinetics study of leaching Ni and Co from waste superalloys with sulfuric acid provided some reference for the recycle of waste superalloy in industry practice.

关 键 词：物理化学 高温合金 硫酸浸出 动力学 

分 类 号：TG132.32[一般工业技术—材料科学与工程]