摘要
以粉煤灰为原料,将其焙烧后得到的熟料经过硫酸酸浸工艺处理得到含有铝离子的酸浸液,通过调节pH值将氢氧化铝析出,以其作为铝源,与氧化镁、碳酸钠在密闭条件下进行水热反应合成镁铝水滑石。Fourier变换红外光谱仪,X射线衍射和扫描电子显微镜对产物进行分析,结果表明:摩尔比n(MgO):n(Al(OH)3):n(Na2CO3)=2:1:1,160℃反应14h,可以合成结晶度较好,物相纯净且片层结构较完整的镁铝水滑石。此外,初步考察了镁铝水滑石对磷吸附的可行性,当磷溶液浓度为20 mg/L,镁铝水滑石投加量为0.7 g时,去除率可达97.4%,pH值适用范围为4~10。
An acid leaching solution containing aluminum ions was obtained by a sulfuric acid leaching process after calcining clinkers using coal fly ash as a raw material. Aluminum hydroxide was precipitated through adjusting the pH value of solution and used as an aluminum source. Magnesium aluminum hydrotalcite was synthesized via hydrothermal reaction with magnesium oxide and sodium carbonate. Based on the results by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy, magnesium-aluminum hydrotalcite with a good crystallinity, a pure phase and a complete lamellar structure can be synthesized under the hydrothermal conditions(i.e., mole ratio n(Mg O):n(Al(OH)3):n(Na2CO3) of 2:1:1, at 160 ℃ for 14 h). In addition, the feasibility of adsorbing phosphorus by Mg-Al hydrotalcite was also investigated. The removal rate can reach 97.4% when the concentration of phosphorus solution is 20 mg/L, the dosage of Mg-Al hydrotalcite is 0.7 g and pH value is 4-10.
作者
刘定鹏
秦军
吕晴
何敏
于杰
李杏
LIU Dingpeng;QIN Jun;LV Qing;HE Min;YU Jie;LI Xing(Key Laboratory of the Ministry of Land and Resources of Karst Environment and Geology Disasters,Guizhou University,Guiyang 550025,China;College of Materials Science and Metallugry Engineering,Guizhou University,Guiyang 550025,China;National Engineering Research Center for Compounding and Modification of Polymeric Materials,Guiyang 550014,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2020年第8期1341-1347,共7页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(51763002,21266005)
贵州省科技厅联合基金项目(黔科合LH字[2014]7648)。
关键词
粉煤灰
酸浸提铝
水热反应
镁铝水滑石
磷吸附
coal fly ash
acid leaching of aluminum
hydrothermal method
magnesium aluminum hydrotalcite
phosphorous adsorption
