摘要
为了探索煤矸石的高效资源化利用,基于固相法和正交实验原理,通过微波辅助和传统加热方式,系统研究了其对煤矸石中铁、铝、钛浸取率的影响。结果表明:两种加热方式均可促使煤矸石中的铁、铝、钛组分达到较高的浸取率。其中,微波辅助加热最佳浸取条件为微波功率800W、酸矸比1.5(w/w)、微波辐照时间60min,此时煤矸石中的铁、铝、钛浸出率分别为98.13%、95.07%和76.33%;传统加热最佳浸取条件为加热温度170℃、酸矸比1.4(w/w)、加热时间4h,此时煤矸石中的铁、铝、钛浸出率分别为98.69%、97.43%和92.45%。采用化学分析、X射线衍射(X-ray diffraction,XRD)、扫描电镜(Scanning electron microscope,SEM)、能谱仪(Energy dispersive spectroscopy,EDS)等对煤矸石及浸取渣的化学成分、物相组成、微观形貌和微区成分进行了表征分析。
In order to high-efficient resource utilization industrial solid waste materials-coal gangue, based on solid phase method（SPM） and orthogonal experiment principle, separation and recovery of iron, aluminum and tita- nium from coal gangue were implemented by sulfuric acid leaching at microwave-assisted（MA） and traditional heated conditions. The reaction process during different heating ways and the factors, such as heating ways, time and acid to gangue ratio （w/w）, affecting leaching iron, aluminum and titanium were investigated. The results showed that the activity of the coal gangue increases after both two types of heating. The optimal process parameters are microwave power 800 W, acid to gangue ratio 1.5 and microwave radiation time 60 min for the heating in microwave-assisted and heated temperature 170 ~C, acid to gangue ratio 1.4（w/w） and heated time 4 h for doing in oven. At these conditions, the leaching rates of iron, aluminum and titanium reach 98. 13~, 95. 07~ and 76. 33~ for former and 98. 69~, 97.43 ~ and 92.45 ~ for later, respectively. The results indicate that under microwave-assisted conditions, the reac- tion time can be greatly reduced, but in this way, titanium is not sufficiently leached~ traditional heated can fully leached of valuable components of coal gangue, but the reaction time is longer, energy consumption is relatively high. Chemical composition, phase compositions and micro-structures as well as micro-compositions of the raw material and acid leaching residues were analyzed and characterized by chemical analysis, XRD, SEM and EDS at different heating ways.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2015年第14期124-130,共7页
Materials Reports
基金
贵州省十二五科技攻关项目(201271022)
关键词
煤矸石
固相法
微波辅助
传统加热
浸取
铁
铝
钛
coal gangue, solid phase method （SPM）, microwave-assisted （MA）, traditional heated, leaching,iron, aluminum, titanium
