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Dynamic hydrothermal synthesis xonotlite spherical aggregates formation mechanism

Author: LiangHongXun
Tutor: LiZuoQiang
School: China Building Materials Academy
Course: Inorganic non-metallic materials
Keywords: Xonotlite Dynamic hydrothermal method Insulation material C-S-H gel
CLC: TQ027
Type: Master's thesis
Year: 2001
Downloads: 205
Quote: 4
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Abstract


Through dynamic hydrothermal synthesis of spherical particles xonotlite high porosity, the light-weight material xonotlite become a widely used insulation material. This paper discusses the dynamic hydrothermal synthesis xonotlite process, xonotlite spherical aggregates formation mechanism. Dynamic hydrothermal synthesis Xonotlite stone slurry is a solid - liquid two-phase suspension xonotlite aggregates morphology on the apparent viscosity of the slurry great influence, and the slurry pseudoplastic. Dynamic hydrothermal synthesis process xonotlite: SiO 2 and Ca (OH) 2 reaction, first formed spherical CSH gel particles, holding time, The crystal fiber surface of the CSH gel. Fibrous crystal growth, the slurry of the solid phase particle size increases, causing changes in the apparent viscosity of the slurry. Direct measurement of dynamic hydrothermal synthesis process xonotlite torque stirrer suffered changes calculated different holding times the apparent viscosity of the slurry. Through the hard calcium stones apparent viscosity of the slurry obtained xonotlite crystal and crystal growth nuclear energy, to achieve the synthesis of xonotlite direct detection. XONOTLITE heating phase synthesis process, it should be high-speed stirring, the slurry so that the heat and mass transfer, and solid particles suspended in a liquid phase advantageously. XONOTLITE fibrous crystals under the action of shear forces along the CSH gel particles can grow on the surface, and then growing from the surface to the inside, forming the \Stirred reactor Reynolds number of 1.65 × 10 4 ~ 1.42 × 10 4 , it is advantageous xonotlite spherical aggregates formed. Strontium nitrate as a mineralizing agent, was studied in a dynamic hydrothermal synthesis xonotlite process, strontium nitrate for xonotlite formation and the impact of spherical aggregates. Studies show that: the presence of strontium nitrate, increased ionic strength of the slurry to produce salt effect, so that there is a time extension of CSH gel, xonotlite formation hysteresis. Be added in the synthesis of strontium nitrate CSH gel can reduce the absolute value of the ζ potential of micelle particle size becomes large. Sr 2 ions can promote xonotlite fibrous crystals and spherical aggregates grow up.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical processes ( physical processes and physical and chemical processes ) > Mixing and mixing process
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