摘要
铁尾矿中富含铁、硅等有价元素,可作为制备功能性材料的原料。为考察硫酸焙烧法提取铁制备α-Fe2O3光催化剂的可能性,研究了焙烧过程中酸矿比、焙烧温度、焙烧时间对铁提取率的影响,得到适宜的焙烧条件为:酸矿比2∶1、焙烧温度280℃、焙烧时间2 h,此时铁的提取率为89.80%。焙烧熟料经浸出、过滤制得含铁的硫酸盐溶液,采用中和沉淀法制备含铁的前驱体,再经400℃煅烧2 h制得粒径为40~50 nm、分散性较好的α-Fe2O3光催化剂。α-Fe2O3光催化降解甲基橙时,暗反应20 min吸附率为56%,光催化120 min时的降解率可达99%,表明α-Fe2O3具有良好的光催化性能。该研究结果实现了铁尾矿中铁的综合利用,促进光催化剂的实用化。
Iron tailings are rich in valuable elements such as iron and silicon,which can be used as raw materials toprepare functional materials. The possibility to prepare α-Fe2O3 photocatalyst by iron extracted from iron tailings with sulfuricacid roasting was investigated,and the effects of acid to ore mass ratio,roasting temperature and roasting time on the extrac-tion rate of iron in the roasting process were studied. The suitable roasting conditions were obtained in the condition of the ac-id to ore mass ratio of 2∶1,the roasting temperature of 280 °C and the roasting time of 2 h,in which the iron extraction ratewas up to 89.80%. The iron-containing sulphate solution obtained by water leaching and filtering process with roasting clinkerwas treated by a neutralization precipitation method to prepare iron-containing precursor,and then calcined at 400 °C for 2 hto obtain α-Fe2O3 with a particle size of 40~50 nm,which performed good dispersibility. When α-Fe2O3 was used as photocat-alytic for degradation of methyl orange,the adsorption rate of dark reaction was 56% for 20 min,and the photocatalytic deg-radation rate was 99% for 120 min,indicating that α-Fe2O3 has good photocatalytic performance. The results realized thecomprehensive ultilization of iron from the tailings and promote practice of the photocatalytic.
作者
牟文宁
卢俊达
罗绍华
雷雪飞
梁金生
段昕辉
Mu Wenning;Lu Junda;Luo Shaohua;Lei Xuefei;Liang Jinsheng;Duan Xinhui(School of Resources&Materials,Northeastern University at Qinghuangdao,Qinghuangdao 066004,China;Key Laboratory of Resources Cleaner Conversion and Efficient Utilization Qinhuangdao City,Qinhuangdao 066004,China;Manufacturing Innovation Center for Solid Waste Resource Utilization and Ecological Development(Hebei University of Technology),Tianjin 300130,China)
出处
《金属矿山》
CAS
北大核心
2020年第7期206-210,共5页
Metal Mine
基金
河北省自然基金面上项目(编号:E2020501022)
中央高校基本科研业务专项(编号:N182304016)
河北省高等学校青年拔尖人才项目(编号:BJ201604)
河北省典型铁尾矿库区土壤重金属分布及尾矿综合利用技术研究项目(编号:802060671901)。
关键词
铁尾矿
硫酸焙烧法
α-Fe2O3光催化剂
降解率
Iron tailings
Sulfuric acid roasting method
α-Fe2O3 photocatalysis
Degradation rate
