The silica gel in Rapid microwave drying process
Abstract:
Silica from the silica gel mSiO2 · nH2O appropriate dehydration from the solid particles of different sizes of porous material. Their structural characteristics and use of activated carbon are very similar. Wet steam in the air and dust particles has a strong adhesive force, a lot of the role of desiccant, clarifying agent, also used as a catalyst carrier. Packaging engineering for large-scale use silica gel desiccant, generally using the traditional method of heat drying, oven baked with a spare 24 ~ 48h. Conventional thermal drying because thermal conductivity is poor, caused by the presence of porous desiccant adsorption of molecular force of the water within the evaporation of the difficult, from the heated drying cycle is long, power-consuming. In addition to water depth and difficult to achieve the purpose. According to the principle of microwave heating and microwave heating practice, repeated studies in composition and moisture absorption mechanism of silica, based on the use of silica gel desiccant polar molecule has a high microwave magnetic loss properties to carry out the process of industrial drying. According to the performance of commercially available silica gel color index, absorption rate of 31% or more, provided the chart [2] show that the rate of silica gel 37% moisture, wet should be enough electromagnetic absorbent. Dynamics by microwave drying, microwave direct heating can be formed out of the water jet causes vaporization of the water vapor pressure, driven by silica gel adsorbed water inside outward along the wick structure, thereby greatly enhancing the water discharge rate.
