Hydrothermal Preparation of Cesium Tungstate

Cesium tungstate is an inorganic transparent thermal insulation material with strong near-infrared absorption and radiation properties. Since its publication, it has been continuously pursued by high-end glass manufacturers and coatings providers.

With the research of nano-cesium tungstate continue to deepen, people pay more and more attention to the preparation of nano-tocopheryl tungstate powder, at present, the preparation methods of cesium tungstate are mainly prepared by solid phase method, liquid phase coprecipitation method, microemulsion method, hydrothermal method and so on. However, the solid method of reunion is serious and the quality of the coprecipitation method is deficient. The microemulsion method is difficult to scale production, and the cost of hydrothermal method is higher.

Recently, the patent number CN201510665103.4 proposed a method for the production of hydrothermal synthesis of nanoscale cesium tungstate powder, at least one of ammonium tungstate, ammonium para tungstate and ammonium tungstate is a tungsten source. Cesium hydroxide, cesium carbonate, citric acid, oxalic acid cesium cesium in at least one cesium source; Using PVA as dispersant; Dissolving the tungsten source, the cesium source and the dispersant respectively into water to obtain three solutions, the three solutions were then mixed with at least two kinds of organic solvents containing alcohol, ether and ester functional groups in order to concentrate and dry and get powdery substances less than 120 degrees, the powdery material is calcined at a temperature of 250 to 800 °C for 1 to 8 hours, 1 - 8h was stirred and filtered, and the blue nanoscale cesium tungstate powder was pulverized.

According to the owner of the patent, the nano tungstate cesium powder produced by this method is free from washing, basically non agglomerated, easy to disperse into nanoparticles and has high production efficiency. The technology is relatively safe, environmental, and low in cost, so it is convenient for industrial production.

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