赵晗,刘连利,刘佳囡.硅酸钠溶液水热法深度脱铝研究[J].矿冶,2019,28(3):.
硅酸钠溶液水热法深度脱铝研究
Study on deep dealuminization of sodium silicate solution by hydrothermal method
投稿时间:2018-04-25  修订日期:2019-04-08
DOI:
中文关键词:  硅酸钠溶液  深度脱铝  水热法  水化石榴石
英文关键词:silicate solution  deep dealumination  hydrothermal synthesis  hydrated garnet
基金项目:辽宁省博士启动基金资助项目(20170520067);.国家自然科学基金青年基金资助项目(51804035)
        
作者单位
赵晗 渤海大学
刘连利 渤海大学 辽宁省硅材料工程技术研究中心
刘佳囡 渤海大学 化学化工学院
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中文摘要:
      以47 g/L Na2SiO3?9H2O、40 g/L NaAlO2和19 g/L CaCl2为原料,采用水热法,通过合成稳定的水化石榴石物相,达到反应体系深度脱铝得目的。通过对水热条件160 ℃、1~16 h下得到的粉体的X射线衍射(XRD)和扫描电镜(SEM)分析,得到硅酸钠溶液深度脱铝的最佳条件。实验结果表明水热时间1 h,反应体系中Ca5Si6O16(OH)2、Ca5Si6O16(OH)2?8H2O和低铝水化石榴石Ca5Si5Al(OH)O17?5H2O絮状混合沉淀大量生成,降低溶液中铝含量。随着反应时间的延长,当水热时间达到10~12 h,体系中出现新的高铝水化石榴石Ca2.93Al1.97Si0.64O2.56(OH)9.44物相与低铝水化石榴石Ca5Si5Al(OH)O17?5H2O共同除铝,实现反应体系的深度脱铝。
英文摘要:
      The dealumination optimal conditions of sodium silicate solution was obtained through characterizing the product under the hydrothermal temperature 160 °C for 1~16 h by X-ray diffraction (XRD), and scanning election microscope (SEM) using Na2SiO3?9H2O (47 g/L), NaAlO2(40 g/L) and CaCl2(19 g/L) as raw materials by synthesizing stable hydrated garnet phase. The flocculation precipitate of Ca5Si6O16(OH)2, Ca5Si6O16(OH)2?8H2O, Ca5Si5Al(OH)O17?5H2O were generated largely and the content of aluminium was decrease for 1 h. The new phase of Ca2.93Al1.97Si0.64O2.56(OH)9.44 was generated when the reaction reach 10~12 h. The aluminium in the solution was removed ulteriorly by Ca2.93Al1.97Si0.64O2.56(OH)9.44 and Ca5Si5Al(OH)O17?5H2O.
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