悬浮分散固化法制备地质聚合物微球的研究

采用悬浮分散固化法,将矿渣、硅酸钠溶液和水制成的地质聚合物浆料滴入温度恒定的二甲基硅油中,分散固化制备地质聚合物微球。通过X射线粉末衍射仪(XRD)、扫描电子显微镜(SEM)、超高速智能粒度分析仪对地质聚合物微球进行分析表征,研究了二甲基硅油温度、分散机转速及二甲基硅油黏度对地质聚合物微球粒径和球形度的影响。结果表明,当保持硅油温度为50℃,直径小于150μm的微球含量最高。当分散机的转速为5000r/min时,1.0~10.0μm微球含量达到19.40%,10.0~30.8μm微球含量达到36.17%。当二甲基硅油黏度为1000mm²/s时,1.0~30.8μm微球含量达到48.19%。由XRD分析可知,制备的地质聚合物微球并没有改变矿渣的晶体结构,说明煅烧去除了微球表面和孔道中残留的二甲基硅油。从BET分析可知,微球具有较高的比表面积和介孔结构,为催化剂载体、吸附剂、水污染处理等方面的应用提供了活性位点,更有利于离子的扩散,具有很广泛的应用前景。

Study on the preparation of geopolymer microsphere by suspension dispersion solidification

Geopolymer microspheres were made by suspension dispersion solidification method(SDS),which was to drop the geopolymer slurry made of slag,sodium silicate solution,and water into dimethylsilicone oil with constant temperature.Geopolymer microsphere was characterized by X-ray powder diffraction(XRD),scanning electron microscope(SEM),and ultra-high speed intelligent particle size analyzer.And based on the characterization,the effects of dimethyl silicone oil temperature,the speed of dispersing machine and viscosity of dimethyl silicone oil on the particle size and sphericity of the microsphere were analyzed.The results showed that when the temperature of dimethylsilicone oil was 50℃,the content of microspheres less than 150μm was the highest.When the speed of the dispersing machine was 5000 r/min,the contents of 1.0~10.0μm and 10.0~30.8μm microspheres reached 19.40%and 36.17%,respectively.When viscosity of dimethylsilicone oil 1000 mm²/s,the content of 1.0~30.8μm microspheres reached48.19%.From XRD analysis,the prepared microspheres did not change the crystal structure of the slag,indicating that sintering removed the residual dimethyl silicone oil on the surface of the microspheres and in the pores.According to BET analysis,the microspheres had high specific surface area and mesoporous structure,which provided active sites for the application of catalyst support,adsorbent,water pollution treatment,etc.The microspheres was easier for ion diffusion and had a broad application prospect.