铬铁矿无钙焙烧渣的酸浸解毒及浸出行为  

Acid leaching detoxification and leaching behavior of chromite ore processing residue

作　　者：吴俊[1] 程雯 全学军[1] 吴海峰 李纲 罗华政 Wu Jun;Cheng Wen;Quan Xuejun;Wu Haifeng;Li Gang;Luo Huazheng(College of Chemistry and Chemical Engineering,Chongqing University of Technology,Chongqing 400054, China)

机构地区：[1]重庆理工大学化学化工学院

出　　处：《无机盐工业》2019年第7期64-67,共4页Inorganic Chemicals Industry

基　　金：重庆市高校优秀成果转化项目(KJZH17128)

摘　　要：在对铬铁矿无钙焙烧渣的组成进行系统分析表征的基础上,提出了在酸性条件下,利用铬渣中未反应的铬铁矿(Fe,Mg)(Cr,Fe)2O4中的二价铁与重铬酸根离子发生氧化还原反应,实现铬渣自身解毒的新方法。研究表明:机械球磨对于铬渣酸浸解毒过程是一个主要的影响因素,对应的铬渣粒度为6~16.5μm,铬渣酸浸解毒的较好工艺条件为:硫酸质量分数为5%,液固比为4mL/g,反应温度为80℃,反应时间为60min。解毒后铬渣中六价铬质量分数能降至2.5×10^-5以下。A new detoxification process of chromite ore processing residue(COPR),which utilized the residual chromite ore (Fe,Mg)(Cr,Fe)2O4 in COPR to react with the Cr2O7^2- in it in an acid environment was proposed on the basis of the systematic analysis and characterization of the composition of COPR.The results indicated that the mechanical grinding played an important role in the new detoxification process of COPR,and the corresponding particle size was at 6~16.5 μm.The optimized detoxification conditions were as follows:the mass fraction of sulphuric acid was 5%,the liquid-to-solid ratio was 4 mL/g,the reaction temperature was 80 ℃ and the reaction time was 60 min. Under the conditions,the mass fraction of the Cr(Ⅵ) in COPR could be reduced to less than 2.5×10^-5 after detoxification.

关 键 词：无钙焙烧铬渣 酸浸 解毒 

分 类 号：TQ136.11[化学工程—无机化工]