摘要
采用单因素浸出试验对含锌尘泥中锌的浸出动力学进行研究,并探讨硫酸浓度、液固比、搅拌速度、反应温度等因素对锌浸出率的影响。结果表明:在硫酸浓度为0.5 mol/L,液固比为6:1(mL:g),搅拌速度为300 r/min,反应时间40 min的条件下,锌的最终浸出率达到96.30%;含锌冶金尘泥在硫酸体系中锌的浸出过程符合n=0.16的Avrami动力学模型,浸出反应表观活化能为10 k J/mol,表明整个浸出过程受边界层扩散控制。采用SEM、XRD及EDS表征含锌尘泥原料以及浸出渣的结构和形貌,结果表明绝大部分锌被浸出,而铁、硅、碳等元素则被留在浸出渣中。
A novel method for leaching zinc from low grade zinc-bearing dust in sulfuric acid solutions was proposed by single factor leaching experiment. The influences of sulfuric acid concentration, liquid-solid ratio, stirring speed and leaching temperature on the zinc extraction were discussed. The results show that, under the conditions that sulfuric acid concentration of 0.5 mol/L, liquid-solid ratio of 6 mL：1 g, stirring speed of 300 r/min and leaching time of 40 min, the zinc extraction reaches 96.30%. The results of leaching kinetics indicates that the leaching process is controlled by the interface transfer and diffusion through the product layer. And when n is 0.16, the gas mud acid leaching process is in accordance with Avrami dynamic model, the apparent activation energy is 10 k J/mol. Using SEM, XRD and EDS, the characterization of zinc-bearing dust raw materials and the structure and morphology of leaching residue were studied. The results show that most of zinc is leached, iron, silicon, carbon and other elements are in the leaching residue.
作者
张晋霞
邹玄
牛福生
ZHANG Jin-xia;ZOU Xuan;NIU Fu-sheng(College of Mining Engineering,North China University of Science and Technology,Tangshan 063009,China;Hebei Province Mining Industry Develops with Safe Technology Priority Laboratory,Tangshan 063009,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2018年第8期1688-1696,共9页
The Chinese Journal of Nonferrous Metals
基金
河北省自然科学基金资助项目(E2015209117)~~
关键词
含锌尘泥
锌
酸浸
浸出动力学
zinc-bearing dust
zinc
acid leaching
leaching kinetics
