ZnSO_(4)-FeSO_(4)溶液氧压水热强化针铁矿法除铁行为与机理  

Iron removal behavior and mechanism of oxygen pressure hydrothermal enhanced goethite method in ZnSO_(4)-FeSO_(4) solution

作　　者：杨博 陆占清 周东风 李兴彬[1] 彭晓华 李人杰 魏昶[1] 邓志敢[1] YANG Bo;LU Zhanqing;ZHOU Dongfeng;LI Xingbin;PENG Xiaohua;LI Renjie;WEI Chang;DENG Zhigan(Faculty of Metallurgy and Energy Engineering,Kunming University of Technology,Kunming 650093,China;Danxia Smelter,Shenzhen Zhongjin Lingnan Nonfemet Co.,Ltd.,Shaoguan 512325,China;Yunnan Chihong Zinc and Germanium Co.Ltd,Qujing 655000,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093 [2]深圳市中金岭南有色金属股份有限公司丹霞冶炼厂,韶关512325 [3]云南驰宏锌锗股份有限公司,曲靖655000

出　　处：《中国有色金属学报》2024年第11期3750-3765,共16页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52164039);云南省重大科技专项项目(202302AG050008,202302AB080012)。

摘　　要：针对湿法炼锌过程中针铁矿法锌铁分离效率低、沉铁产物性能差等问题,本文提出了在氧压水热环境下开展针铁矿法除铁的方法。结果表明:提高反应温度、氧分压、搅拌转速、晶种用量和pH均有利于针铁矿除铁。在反应温度为110℃、氧分压为0.2 MPa的优化反应条件下,产出的沉铁产物中铁含量为55.2%,锌含量为3.2%,硫含量为1.5%;沉铁产物中生成了结晶度较高的针铁矿晶簇。在氧压水热除铁过程中,反应在0~60 min时符合一级反应动力学特征,在60~100 min时满足二级反应动力学特征,反应活化能为34.50 kJ/mol;在110℃下除铁反应的速率常数(k)为0.021 dm^(3)/(mol·min)。In order to solve the problems such as the low efficiency of zinc-iron separation and poor performance of iron residues in the process of zinc hydrometallurgy,this paper proposed a method for iron removal using goethite method in an oxygen pressure hydrothermal environment.The results indicate that increasing reaction temperature,oxygen partial pressure,stirring speed,seed addition and pH are all beneficial for iron removal.Under the optimized reaction conditions with a reaction temperature of 110℃and an oxygen partial pressure of 0.2 MPa,the contents(mass fraction)of iron,zinc and sulfur in iron precipitate product are 55.2%,3.2%and 1.5%,respectively.The iron crystal clusters with high crystallinity are formed in iron precipitate product.During the oxygen pressure hydrothermal iron removal process,the iron removal reaction at the time from 0 min to 60 min follows the first order reaction kinetics characteristics,and then follows the second order reaction kinetics characteristics at the time from 60 min to 100 min.The activation energy of the iron removal reaction is 34.50 kJ/mol,and the rate constant(k)of the iron removal reaction is 0.021 dm^(3)/(mol·min)at 110℃.

关 键 词：湿法炼锌 针铁矿 氧压水热 结晶度 

分 类 号：TF813[冶金工程—有色金属冶金]