氯化法钛工业污泥中铁浸出行为与动力学分析  

Leaching behavior and kinetics of iron from titanium industry sludge by chlorination

作　　者：彭绍鑫 段宁[1] 张银凤 陆成龙 张帆[1] PENG Shaoxin;DUAN Ning;ZHANG Yinfeng;LU Chenglong;ZHANG Fan(College of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation,Hubei Polytechnic University,Huangshi 435003,China;Hubei Engineering Research Center for Collaborative Technology of Advanced Material Manufacturing and SolidWaste Recycling,Hubei Polytechnic University,Huangshi 435003,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]湖北理工学院矿区环境污染控制与修复湖北省重点实验室,湖北黄石435003 [3]湖北理工学院先进材料制造与固废资源化协同技术湖北省工程研究中心,湖北黄石435003

出　　处：《武汉科技大学学报》2025年第2期133-142,共10页Journal of Wuhan University of Science and Technology

基　　金：湖北省技术创新计划重点研发专项(2023BCB142);矿区环境污染控制与修复湖北省重点实验室开放基金(2021XZ103).

摘　　要：本研究以氯化法钛白粉生产过程中产生的含铁污泥为原料,回收废气得到废盐酸作为酸浸剂,系统研究了不同盐酸浓度、浸出温度、浸出时间和液固比对铁浸出率的影响,并对酸浸渣的元素组成、物相组成和微观形貌进行了表征分析。结果表明,在盐酸浓度为5 mol/L,酸浸温度为80℃,酸浸时间为150 min,液固比为16 mL/g的最佳工艺条件下,铁浸出率可达85.88%;XRD、XRF和SEM-EDS分析表明,酸浸渣主要由SiO_(2)、TiO_(2)和Al_(2)O_(3)组成,其中SiO_(2)在酸浸过程中性质稳定,逐渐富集并形成惰性固相层,包裹未反应的污泥颗粒。基于废盐酸浸出体系,构建了钛工业污泥中铁浸出的动力学模型,拟合结果表明,该过程符合惰性固相层控制的收缩未反应核模型,主要受内扩散控制,表观活化能为22.73 kJ/mol。Iron-containing sludge derived from chloride-process titanium white production was employed as the raw material,while waste hydrochloric acid recovered from exhaust gas was utilized as the leaching agent in this study.The effects of hydrochloric acid concentration,leaching temperature,leaching time,and liquid-solid ratio on iron leaching efficiency were systematically investigated.The elemental composition,phase structure,and micro-morphology of acid-leached residues were characterized.The results demonstrate that under optimal conditions(hydrochloric acid concentration of 5 mol/L,leaching temperature of 80℃,leaching duration of 150 min,and liquid-solid ratio of 16 mL/g),the iron leaching efficiency reaches 85.88%.XRD,XRF,and SEM-EDS analyses reveal that the acid-leached residues primarily consist of SiO_(2),TiO_(2),and Al_(2)O_(3).Notably,SiO_(2) remains chemically stable during acid leaching,progressively accumulating to form an inert solid-phase layer that encapsulateds unreacted sludge particles.Akinetic model for iron leaching is established based on the waste hydrochloric acid system,with fitting results indicating compliance with the shrinking unreacted core model controlled by an inert solid-phase layer.The process is predominantly governed by internal diffusion mechanism,exhibiting an apparent activation energy of 22.73 kJ/mol.

关 键 词：钛工业污泥 氯化法 废盐酸 铁浸出 动力学模型 

分 类 号：X788[环境科学与工程—环境工程]