Nano cesium tungstate may be applied for preparing thermal insulation dispersion liquid. With the popularization of this kind of inorganic nano dispersion liquid in the field of heat insulation, the preparation method of cesium tungstate powder has attracted more and more attention from experts.
For example, in order to reduce costs and improve production feasibility, some experts use sodium tungstate and cesium carbonate as raw materials to prepare cesium tungstate at 190°C by hydrothermal reaction. In this process, the intermediate precipitated product should be heated in a N2 atmosphere at 500-800°C to obtain cesium tungstate powder.
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Although the above method avoids the use of H2 and greatly improves safety, it also has defects such as high temperature and energy consumption. In this regard, some experts have overcome the shortcomings of high temperature and energy consumption, using low temperature solvothermal synthesis method to produce cesium tungstate powder. They also use WCI6 and CsOH as high-cost raw materials, dissolve the materials in absolute ethanol, and add the right amount of acetic acid, and finally the cesium tungstate powder can be synthesized by crystallization in a closed high pressure reactor at 200°C for 20h.
