中南大学学报（自然科学版）2025，Vol.56Issue(3)：834-843,10.DOI:10.11817/j.issn.1672-7207.2025.03.002
湿法炼锌溶液矿化沉铁过程中镉、铊离子沉淀行为与机理
Precipitation behavior and mechanism of cadmium and thallium ions in Fe mineralization precipitation from zinc hydrometallurgical solution
摘要
Abstract
To address the lack of clarity regarding the co-precipitation behavior and mechanisms of cadmium(Cd)and thallium(Tl)ions during iron mineralization precipitation from zinc hydrometallurgical solution,iron mineralization precipitation experiments were conducted at 150℃by using a ZnSO4-FeSO4-CdSO4 solution prepared from chemical reagents and a Tl-containing leaching solution provided by a zinc smelter as raw materials.Chemical titration,inductively coupled plasma optical emission spectroscopy(ICP-OES),X-ray diffraction(XRD),scanning electron microscopy with energy-dispersive X-ray spectroscopy(SEM-EDS),X-ray photoelectron spectroscopy(XPS),and other analytical techniques were employed to systematically investigate the elemental composition,phase structure,mineral morphology,elemental distribution,and oxidation states of the iron precipitation products.The results show that the Fe in the precipitation products mainly exists in the form of Fe2O3,and the other phases are compounds such as iron oxyhydroxides(Fe2-x/3(OH)xO3-x)and jarosite.During the iron mineralization precipitation,some cadmium and thallium in the solution precipitats and enters into the compounds such as iron oxyhydroxides,K-jarosite,and Na-jarosite.When the initial Cd2+mass concentration is 1～10 g/L,the precipitation rate of cadmium ion is always lower than 0.3%.The mass fraction of Cd in the precipitation products is only 0.06%,and Cd is incorporated into the iron oxyhydroxides(Fe2-x/3(OH)xO3-x)crystal structure through interstitial occupation or atomic substitution.Cd in the iron oxyhydroxides is coordinated with hydroxyl group(—OH)and O2-.The Cd content is the same in different iron-bearing phases such as hematite and jarosite.In the iron mineralization precipitation,about 30.2%thallium ions in the solution precipitates into the precipitation product,and the mass fraction of Tl in the precipitation product is about 120.32 g/t.When K+and Na+co-exist in the solution,the formation of jarosite phases will promote the precipitation of thallium ion,and Tl+,K+,and Na+co-precipitate in the form of[TlxNayK1-x-y]Fe3(SO4)2(OH)6.关键词
湿法炼锌/矿化沉铁/镉/铊/沉淀行为Key words
zinc hydrometallurgy/iron mineralization precipitation/cadmium/thallium/precipitation behavior分类
冶金工业引用本文复制引用
彭晓华,赵广福,李兴彬,张小飞,杨荣净,邓志敢,魏昶..湿法炼锌溶液矿化沉铁过程中镉、铊离子沉淀行为与机理[J].中南大学学报（自然科学版）,2025,56(3):834-843,10.基金项目
国家自然科学基金资助项目(51964029) （51964029）
云南省重大科技专项项目(202302AG050008,202302AB080012) （202302AG050008,202302AB080012）
云南省科技人才计划项目(202405AC350015)(Project(51964029)supported by the National Natural Science Foundation of China （202405AC350015）
Projects(202302AG050008,202302AB080012)supported by Yunnan Major Scientific and Technological Project （202302AG050008,202302AB080012）
Project(202405AC350015)supported by the Science and Technology Talent Program of Yunnan) （202405AC350015）
