Synthesis, structure, and properties of poly(dimethylsiloxane) networks reinforced by in situ-precipitated silica–titania, silica–zirconia, and silica–alumina mixed oxides

1995 ◽  
Vol 58 (7) ◽  
pp. 1135-1145 ◽  
Author(s):  
Jianye Wen ◽  
James E. Mark
Keyword(s):  
Mixed Oxides ◽  
Structure And Properties ◽  
Precipitated Silica ◽  
Silica Alumina

scholarly journals Silica extraction from bauxite reaction residue and synthesis water glass

2021 ◽  
Vol 10 (1) ◽  
pp. 268-283
Author(s):  
Yunlong Zhao ◽  
Yajie Zheng ◽  
Hanbing He ◽  
Zhaoming Sun ◽  
An Li
Keyword(s):  
Sodium Silicate ◽  
Water Glass ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Hydrated Calcium Silicate ◽  
Precipitated Silica ◽  
Alumina Gel ◽  
Silica Alumina ◽  
Element Removal ◽  
Hydrated Calcium

Abstract Bauxite reaction residue (BRR) produced from the poly-aluminum chloride (PAC) coagulant industry is a solid acidic waste that is harmful to environment. A low temperature synthesis route to convert the waste into water glass was reported. Silica dissolution process was systematically studied, including the thermodynamic analysis and the influence of calcium and aluminum on the leaching of amorphous silica. Simulation studies have shown that calcium and aluminum combine with silicon to form hydrated calcium silicate, silica–alumina gel, and zeolite, respectively, thereby hindering the leaching of silica. Maximizing the removal of calcium, aluminum, and chlorine can effectively improve the leaching of silicon in the subsequent process, and corresponding element removal rates are 42.81%, 44.15%, and 96.94%, respectively. The removed material is not randomly discarded and is reused to prepare PAC. The silica extraction rate reached 81.45% under optimal conditions (NaOH; 3 mol L−1, L S−1; 5/1, 75°C, 2 h), and sodium silicate modulus (nSiO2:nNa2O) is 1.11. The results indicated that a large amount of silica was existed in amorphous form. Precipitated silica was obtained by acidifying sodium silicate solution at optimal pH 7.0. Moreover, sodium silicate (1.11) further synthesizes sodium silicate (modulus 3.27) by adding precipitated silica at 75°C.

scholarly journals Structure and Properties of Polymer-Impregnated Wood Prepared by in-situ Polymerization of Reactive Monomers

BioResources ◽  
2015 ◽  
Vol 10 (4) ◽  
Author(s):  
Xiaoying Dong ◽  
Tianping Sun ◽  
Yixing Liu ◽  
Canghai Li ◽  
Yongfeng Li
Keyword(s):  
In Situ Polymerization ◽  
Structure And Properties ◽  
Impregnated Wood
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