铬盐清洁工艺中含铬铁渣回收钾及资源化处理  

Potassium Recovery and Resourceful Treatment of Iron Slag Containing Chromium from Cleaner Production Process of Chromium Salts

作　　者：翟超[1,2,3] 王京刚[1] 初景龙[2,3] 齐涛[2,3] 

机构地区：[1]北京化工大学化学工程学院,北京100029 [2]湿法冶金清洁生产技术国家工程实验室,北京100190 [3]中国科学院过程工程研究所绿色过程与工程院重点实验室,北京100190

出　　处：《有色金属（冶炼部分）》2011年第7期22-25,共4页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家重点基础研究发展计划(973计划)项目(2007CB613501);"十一五"国家科技支撑计划重点项目(2006BAC02A05)

摘　　要：研究铬盐清洁新工艺产生的含铬铁渣在酸性条件下浆化回收钾的过程,最终得到富铁渣及含钾滤液,富铁渣可用作炼铁原料,含钾滤液进一步处理后可制备相应产品。考察pH值、温度、液固比、反应时间对脱钾率的影响,优化工艺条件。结果表明,在pH值3.5～4.5,反应温度100℃,液固比为7∶1,反应时间90 min条件下,可脱除铁渣中80%以上的钾,反应条件较温和,所选择的酸性脱钾剂为硫酸亚铁,其中Fe2+对铁渣中的微量Cr6+具有还原解毒作用,有利于工业实施。The process of potassium recovery under acidic condition from iron slag containing chromium derived from cleaner production process of chromium salts is investigated.The products are iron-rich slag for iron smelting and filtrate containing potassium for relevant product preparation.The effects of pH,temperature,ratio of liquid to solid,and reaction time on the removal of potassium are described and the reaction conditions are optimized.The results show that more than 80% of potassium in iron slag are removed under acidic slurry medium with a moderate reaction condition,pH 3.5~4.5,temperature 100 ℃,L/S7∶1,reaction time 90 min.The reagent for removal of potassium is ferrous sulfate,which also plays a role of Cr6＋ reductant and detoxicant,and thus is more suitable for industrial applications.

关 键 词：冶金技术 含铬铁渣 钾回收 浆化 脱钾 

分 类 号：X753[环境科学与工程—环境工程] TF826.1[冶金工程—有色金属冶金]