摘要
为扩大锌工业可供矿物来源,文中开发了一种微波活化强化锌中浸渣-高铁闪锌矿混合体系协同浸出的新工艺。通过考察硫酸浓度、浸出温度、矿物粒度、搅拌速度和矿渣比单因素的影响,微波预处理样品形貌,及浸出过程渣相组分,确定了浸出反应过程及动力学。结果表明:微波加热活化预处理对于后续浸出处理更为有利;在硫酸体系中,含锌物相的浸出顺序为:Zn_2SiO_4-ZnS-ZnFe_2O_4;在混合体系浸出中,锌的浸出过程遵循"收缩核模型",反应前期,锌的浸出速率受界面化学反应控制,表观活化能为53.94 kJ/mol,浸出后期,浸出渣中单质硫含量的增加,其会在矿物颗粒的表面形成致密包覆,从而使得锌的浸出速率受扩散控制。
In order to enlarge the resource of material in domestic zinc industry,a new synergic leaching technology of activated neutral leached residue and high iron sphalerite mixing system assisted by microwave heating is developed in this paper.Through investigating the morphology of microwave pretreated samples,effects of sulfuric acid concentration,leaching temperature,mineral particle size,agitation speed,and slag ore ratio,and the components of slag during leaching,leach reaction process and kinetics are determined.The results show that the microwave heating assisted pretreatment is more favorable for the subsequent leaching treatment.In the sulfuric acid leaching system,leaching sequence of the zinc-containing phases are:Zn 2 SiO 4-ZnS-ZnFe 2 O 4.The leaching of zinc follows the model of"nucleus shrinkage".In the early stage,leaching of zinc is controlled by the interface chemical reaction,which has an apparent activation energy of 53.94 kJ/mol.In the later stage,content of elemental sulfur in the leaching slag gradually increases,and forms a dense package on the surface of the mineral particles,and thus leaching of zinc is controlled by diffusion.
作者
蔺琎
张利波
彭金辉
杨坤
LIN Jin;ZHANG Li-bo;PENG Jin-hui;YANG Kun(Engineering Training Center,National Experimental Teaching Demonstration Center,KunmingUniversity of Science and Technology,Kunming 650504,Yunnan Province,China;Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan Province,China)
出处
《化学工程》
CAS
CSCD
北大核心
2019年第3期55-61,共7页
Chemical Engineering(China)
基金
云南省教育科学研究基金项目资助项目(2016zzx291)
关键词
含锌中浸渣
高铁闪锌矿
微波活化
浸出
动力学
zinc neutral leached residue
high iron sphalerite
microwave activation
leaching
dynamics
