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| Study on deep dealuminization of sodium silicate solution by hydrothermal method |
| Received:April 25, 2018 Revised:April 08, 2019 |
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| DOI： |
| KeyWord:silicate solution; deep dealumination; hydrothermal synthesis; hydrated garnet |
| Author | Institution |
| Han Zhao |
Bohai University |
| Lian-li Liu |
Bohai University,Engineering technology research center of silicon materials in Liaoning province,Jinzhou |
| Jia-nan Liu |
School of Chemistry and Chemical Engineering, Bohai University |
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| Abstract: |
| 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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