铬铁矿无钙焙烧渣中铬的绿色提取  

Ecofriendly extraction of chromium from calciumfree roasting slag of chromite ore

作　　者：蹇成宗 蒋子文 全学军[1] 李纲 JIAN Chengzong;JIANG Ziwen;QUAN Xuejun;LI Gang(School 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,重庆400054

出　　处：《无机盐工业》2024年第7期118-125,共8页Inorganic Chemicals Industry

基　　金：重庆英才计划项目(CQYC20210309538)。

摘　　要：铬铁矿无钙钠化氧化焙烧—水浸提取是目前铬盐生产的主流工艺,提取剩余的铬渣中仍然存在一定量未反应完全的铬及新生成的含铬矿物。开展从铬渣中深度提取铬的绿色工艺研究,对于资源综合利用具有十分重要的意义。以铬铁矿无钙焙烧铬渣为原料,提出了一种铬渣烧碱焙烧—水浸提铬绿色工艺。研究结果表明:无钙焙烧铬渣通过烧碱焙烧—水浸提铬绿色工艺,不仅降低焙烧反应温度,还可以消除传统焙烧过程中产生的CO_(2),实现铬的绿色提取;铬的提取率达到92%以上,经过焙烧—浸出产生的铬渣中Cr(Ⅵ)含量降低至3.85 mg/L;铬的氧化焙烧动力学由内扩散控制,频率因子A为0.39 s^(-1),反应表观活化能E_(a)为15.22 kJ/mol。该研究结果可为无钙焙烧铬渣的深度绿色提铬及铬渣资源化处理提供新的技术思路。Calciumfree oxidative roasting of chromite ore and water leaching is the mainstream process of chromium salt production,but there is still a certain amount of residual chromite ore and some newly generated chromiumcontaining minerals in the chromite ore processing residue(COPR).Research on the ecofriendly process of deep extraction of chromium from the COPR will be very important to the comprehensive utilization of resources.An ecofriendly extraction process of chromium salt from the COPR was proposed.The research results showed that the chromium could be extracted by an ecofriendly alkali roastingwater quenching process,and this new process could not only reduce the roasting reaction temperature,but also eliminate CO_(2) produced in traditional roasting process.The extraction rate of chromium reached more than 92%,and the Cr(Ⅵ)in the leached chromium slag was reduced to 3.85 mg/L.The kinetics of the oxidative roasting of chromium was controlled by internal diffusion with a frequency factor A of 0.39 s^(-1) and an apparent activation energy of the reaction E_(a) of 15.22 kJ/mol.The obtained results could provide new technical ideas for deep extraction of chromium from COPR using an ecofriendly process.

关 键 词：铬铁矿 提取铬 铬渣 绿色提取 

分 类 号：TQ136.11[化学工程—无机化工]