硫酸法钛白铁资源综合利用现状及展望  

Current situation and prospect of comprehensive utilization of titanium white iron resources by sulfuric acid process

作　　者：邱在容 彭长宏 周康根 陈伟 QIU Zairong;PENG Changhong;ZHOU Kanggen;CHEN Wei(School of Metallurgy and Environment,Central South University,Changsha 410083,China)

机构地区：[1]中南大学冶金与环境学院,长沙410083

出　　处：《有色金属科学与工程》2024年第5期758-764,共7页Nonferrous Metals Science and Engineering

基　　金：广西重点研发计划项目(桂科AB21220007)。

摘　　要：硫酸法生产钛白粉过程中会产生含大量铁资源的副产七水硫酸亚铁渣和废酸,每产生1.0 t钛白粉约会产生5.0 m3游离硫酸和4.0 t副产品硫酸亚铁,这两种废物中的铁资源具有高利用价值。目前,仅有少部分七水硫酸亚铁渣得到了综合利用,其余以堆存方式处置,废酸则主要用石灰中和工艺处理,不仅造成大量铁资源的浪费,还存在严重的环境风险。本文基于硫酸法钛白铁资源总量及其分布特性,明确了铁基资源利用是制约其清洁生产的瓶颈,提出了将钛铁矿中铁资源用于制备电池级磷酸铁和铁系颜料的新思路,以实现钛白废酸和副产硫酸亚铁渣的高值化利用,并对其可行性进行了系统分析。During the production of titanium dioxide by sulfuric acid method,by-products containing a large amount of iron resources,such as ferrous sulfate heptahydrate slag and waste acid,are generated,For every 1.0 ton of titanium dioxide produced,approximately 5.0 m3 of free sulfuric acid and 4.0 ton of by-product ferrous sulfate are produced.The iron resources in these two types of waste have high utilization value.Currently,a mere fraction of the ferrous sulfate heptahydrate slag has undergone comprehensive repurposing,while the majority languishes in storage.Meanwhile,the waste acid is primarily used for lime neutralization,a procedure that not only results in the squandering of significant iron resources but also poses a substantial environmental risk.Based on the total amount of titanium dioxide resources and their distribution characteristics in the sulfuric acid process,this work clarifies that the utilization of iron-based resources is the bottleneck to restricting its clean production,and proposes a method for using iron resources in ilmenite to prepare battery-grade iron phosphate and iron-based pigments.With the new idea,the high-value utilization of titanium dioxide waste acid and by-product ferrous sulfate slag can be achieved,and its feasibility has been systematically analyzed.

关 键 词：硫酸法钛白 铁资源 电池级磷酸铁 铁系颜料 

分 类 号：TF805.2[冶金工程—有色金属冶金] X756[环境科学与工程—环境工程]