铁尾矿煅烧酸浸法制备白炭黑及动力学研究  

Investigating kinetics in preparation of precipitated silica from iron ore tailings

作　　者：张鹏 陈星月 任志峰[1] 李怡宏 赵爱春[1] 何奕波 Zhang Peng;Chen Xingyue;Ren Zhifeng;Li Yihong;Zhao Aichun;He Yibo(College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《钢铁钒钛》2022年第2期87-93,共7页Iron Steel Vanadium Titanium

基　　金：山西省基础研究计划资助项目(202103021223277);国家自然科学基金项目(51904278);山西自然科学基金项目(20210302123218)。

摘　　要：铁尾矿是钢铁工业生产过程的废弃物,目前堆存量已超过百亿吨,考虑其千亿元以上的潜在价值,将其作为二次资源回收利用将成为必然趋势。铁尾矿成分主要以SiO_(2)为主,因此从铁尾矿中提取SiO_(2)再利用是实现其资源化利用的重要发展方向。通过对河北某钢厂铁尾矿成分解析发现,其SiO_(2)的含量达到68.64%,其中硅的氧化物主要以石英、钠长石、滑石等晶体形式稳定存在于尾矿中。因此提出采用煅烧酸浸法制备白炭黑。具体工艺为:首先对铁尾矿进行高温碱熔活化预处理,再通过酸浸法制备白炭黑。最终确定了最佳碱熔煅烧-酸浸工艺参数:活化温度为850℃、活化时间为2 h、Na_(2)CO_(3)/SiO_(2)=1:1.5;酸浸过程溶液pH值为7,搅拌温度60℃。在此条件下,铁尾矿硅元素的提取率可达到86.43%,酸浸得到的白炭黑SiO_(2)含量达到92.26%。此外,对铁尾矿不同升温速率条件下的碱熔煅烧过程进行了动力学研究,推导出碱熔煅烧过程的数学模型,为铁尾矿活化焙烧工艺提供理论依据。Iron ore tailings(IOT),which are by-product of the ore-smelting process.It will be an inevitable trend to recycle them as a secondary resource due to the potential value of more than 100 billion yuan.Through the composition analysis of IOT from a steel plant in Hebei Province,the SiO_(2) in IOT reaches 68.64%,existing mainly in the form of quartz,albite,talc and other crystals.Therefore,the calcination–acid leaching method was proposed to produce silica.The optimum calcination parameters were determined as follows:calcination temperature=850℃,calcination time=2 h,Na_(2)CO_(3)/SiO_(2)=1:1.5.For the acid leaching process,the pH value of the solution is 7 and the stirring temperature is 60℃.The results show that the extraction rate of Si from IOT reached 86.43%,and the content of SiO_(2) was 92.26%.In addition,the kinetics of the calcination process was studied,and the activation reaction mechanism and kinetic parameters of IOT were deduced,which provided a theoretical basis for the activation calcination process of IOT.

关 键 词：铁尾矿 资源化利用 白炭黑 煅烧酸浸法 动力学 

分 类 号：X757[环境科学与工程—环境工程] TQ127.2[化学工程—无机化工]