低铁含量粉煤灰化学除铁增白的研究  

The Study of Brightening Coal Fly-ash with Low Iron Content by Chemical Deironization

作　　者：樊慧明[1,2] 王学琴[1,2] 王命[1,2] 蒋心灵 刘建安[1,2] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室 [2]华南理工大学造纸与污染控制国家工程研究中心,广东广州510640

出　　处：《造纸科学与技术》2016年第2期39-44,共6页Paper Science & Technology

基　　金：广东省科技计划项目(2011B010300015);科技部科技型中小企业创新基金(12C26214405137)

摘　　要：本文研究一种低铁含量粉煤灰酸浸-还原法化学除铁的主要影响因素及水平,并通过正交实验优化工艺条件。通过单因素实验,分析硫酸用量,酸浸时间,保险粉用量,保险粉反应时间,草酸用量,草酸反应时间,反应温度对除铁的影响。结合正交实验,得到结果为:基于粉煤灰质量,草酸用量1%,草酸反应时间为5min,保险粉用量为1%,反应时间为5min,固含量为20%,硫酸用量为20%,酸浸时间为30min,反应温度为30℃。此条件下,所得粉煤灰白度为53%ISO,铁的去除率约50%,粉煤灰白度提高21%ISO。The main factors and the levels of a low iron content coal fly- ash,de- ironized by chemical acid leaching- reduction,were studied and the optimal condition was got by orthogonal experiments. Through single factor experiment,the amount of sulfuric acid and leaching time,the amount of sodium hydrosulfite and reaction time,the amount of oxalic acid,and leaching time and the reaction temperature were analysed. Combined with orthogonal experiment and based on the quality of coal ash,the optimum conditions were： oxalic acid dosage 1%,reaction time 5minutes,sodium hydrosulfite dosage 1%,reaction time 5 minutes,stirring speed 300 r / min,solid content 20%,sulfuric acid dosage 20%,reaction time 30 minutes,reaction temperature 30 ℃. Under the optimum conditions,coal fly- ash brighteness could reach 53% ISO,gain of 21% ISO,and iron removal rate was about 50%.

关 键 词：粉煤灰 化学除铁 增白 

分 类 号：TQ172[化学工程—水泥工业]