镍铁尾矿硫酸浸出动力学研究  

Leaching Kinetics of Josephinite Tailings with Sulfuric Acid

作　　者：陈安安[1] 周少奇[1,2,3] 黄鹏飞[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广州510006 [2]华南理工大学亚热带建筑科学国家重点实验室,广州510641 [3]广东省教育厅环境保护与生态修复重点实验室,广州510006

出　　处：《环境科学》2013年第7期2729-2734,共6页Environmental Science

基　　金："十一五"国家科技支撑计划项目(2008BAE64B05);广州市重大科技项目(2008DLB2080500)

摘　　要：酸浸是镍铁尾矿资源化工艺的前处理,也是整个工艺中的最为关键的步骤,目的是将尾矿中的Si、Mg以及其他金属元素有效分离.采用单粒级尾矿实验获得动力学数据,利用收缩核模型分析了硫酸浸出镍铁尾矿中Mg2+的动力学.推断硫酸浸出镍铁尾矿中Mg2+的浸出动力学属产物层扩散控制,表观活化能E为34.04 kJ·mol-1.正是这种表面形成的产物层抑制了镍铁尾矿与硫酸的进一步反应,导致尾矿中Mg2+的浸出率不高.Leaching is the most important step of josephinite tailing recycle technology. This step can separate the valuable metal Mg from Si and other impure metal. Effects of sulfuric acid on leaching Mg efficiency from josephinite tailings were investigated. To obtain the leaching behavior, a modified unreacted shrinking core model that based on the experimental data was used to determine the dissolution kinetic parameters. The model was significant and showed that the dissolution of Mg2＋ in josephinite tailing was controlled by the produce layer diffusion, apparent activation reaction energy E=34.04 kJ·mol-1. The produce layers obstruct the forward reaction of the dissolution of Mg2＋.

关 键 词：镍铁尾矿 酸浸 动力学 活化能 资源化利用 

分 类 号：X753[环境科学与工程—环境工程]