Today, we share several methods for producing zirconium dioxide using zirconium chloride. The specific methods are as follows:
1. The zirconium oxide process involves melting zirconium silicate with caustic soda at 650°C, followed by leaching the melt with hot water. Silicon is separated from sodium zirconate in the form of sodium silicate. The mixture is then treated with sulfuric acid to obtain a zirconium sulfate solution, which is further purified by adding ammonia water to precipitate zirconium hydroxide. Dissolving the zirconium hydroxide in hydrochloric acid yields zirconium chloride. This is then concentrated by evaporation, cooled to crystallize, ground, and calcined to produce zirconium dioxide. Additionally, heat decomposition or oxidation decomposition of easily purified zirconium compounds can be used to prepare high-purity zirconium oxide.
2. The product was obtained by recrystallizing zirconium oxychloride (ZrCl2O·8H2O) with hydrochloric acid and then calcining at high temperature.
3. The hydrolysis method prepares highly pure ultra-fine zirconium dioxide using zirconium oxychloride as raw material. By adding 0.2 to 0.3 mol/L of high-purity zirconium oxychloride solution to deionized water for hydrolysis, and boiling the zirconium oxychloride solution for a prolonged period, the continuously evaporating hydrolysis products are removed. The hydrolysis reaction is carried out for over 50 hours under boiling conditions, followed by filtration. The product is then washed with deionized water, dried, calcined, and milled to obtain the final product.
4. The high-temperature hydrolysis process involves spraying a 1mol/L high-purity zirconium oxychloride solution into a decomposition furnace at 1000°C. The tiny droplets of zirconium oxychloride first evaporate water, followed by hydrolysis to form zirconium dioxide. The resulting zirconium dioxide is collected via a cyclone separator, then subjected to acid washing, water washing, and drying to obtain the final product.