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Research on the process of preparing wollastonite powder using sol-gel method
07 Nov,2023
The summary describes the preparation of CaO-SiO2 dry gel powder using tetraethyl orthosilicate (TEOS) and calcium acetate as raw materials through the sol-gel method. After heat treatment at 1000°C, a wollastonite powder with a particle size of 0.2 to 1.4 μm was obtained. The sol-gel process of the CaO-SiO2 system and the effect of pre-hydrolysis of TEOS on sol-gel cavity formation were studied. The physical and chemical changes and phase transitions of the CaO-SiO2 gel powder during the heat treatment process were investigated using DTA, IR, and XRD. The morphology of the heat-treated product of the dry gel powder was observed using an optical microscope.
1 Introduction
In the 1930s, wollastonite minerals attracted the attention of scholars worldwide due to their excellent properties such as brightness, insulation, thermal resistance, and chemical stability. After the 1960s, wollastonite mineral raw materials were widely used in various fields including the plastics and rubber industry, ceramics industry, coatings industry, construction materials industry, and steel industry, with demand continuously increasing. However, the limitations of natural wollastonite raw materials in terms of particle size, purity, and particle morphology have restricted their broader and deeper applications in various industrial fields.
The sol-gel method is an effective way to prepare high-quality ceramic powders. This work attempts to prepare high-purity CaO-SiO2 gel using the sol-gel method, and then after ball milling the dry gel, high-performance wollastonite powder was obtained through heat treatment. Currently, this research has not been reported domestically or internationally.
2023
/
11-07
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Industry News
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