低温分离、富集冶金粉尘中的Zn  

Separating and enriching zinc from metallurgical dust at low temperature

作　　者：高金涛[1] 李士琦[1] 张延玲[1] 张颜庭[1] 陈培钰[2] 钱刚 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]天津钢管集团股份有限公司,天津300201 [3]湖北新冶钢有限公司,黄石435001

出　　处：《中国有色金属学报》2012年第9期2692-2698,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51074025);中央高校基本科研业务费专项资金资助项目(FRF-SD-12-009A)

摘　　要：系统地研究国内多家钢铁企业粉尘的基础特性，开发出一种低温分离、富集冶金粉尘中Zn等金属元素的新工艺。基于ZnO超细粉的还原挥发热力学分析和动力学实验，进行了粉尘的非熔态还原及Zn的回收、富集研究。结果表明：使用高纯度CO或H2为还原剂，在800-900℃可实现粉尘中ZnO（s）-Zn（g）的转变，气化脱Zn率可达99％；收集到的气态还原产物经水洗去除掉K、Cl等元素后，富集成含zn量可达90％的富Zn物料。同时，较低的温度使得粉尘于非熔融状态下还原，固态还原产物中Fe的金属化率可达90％，可直接经物理分离获得固态高纯铁。The characteristics of dust obtained from different steelmaking enterprises were systematically studied. A new process for separating and enriching zinc from metallurgical dust at low temperature was developed. Based on the volatilized thermodynamics analysis and dynamics reduction experiment of pure ultra-fine ZnO, the experimental study on non-molten reduction and recovery and enrichment of zinc in dusts was carded out. The results show that zinc oxide is reduced to metallic zinc, using high-purity CO or H2 as the reducing agent at 800-900 ℃, and the de-zincing rate is over 99%. The collected gaseous reduction products are washed to get rid of K, C1 and other elements, then the enrichment, called Zn-rich material, is obtained with the content of Zn up to 90%. At the same time, the dusts are reduced at the state of non-molten because of low temperature, and the metallization of Fe in product of solid-state reduction is as high as 90%. Furthermore, the solid-state high-purity iron can be directly separated physically.

关 键 词：冶金粉尘 非熔态还原 Zn富集 

分 类 号：TF813[冶金工程—有色金属冶金]