Oxygen zirconium chloride by burning zirconia is available, its quality is derived from the quality of the oxygen zirconium chloride, sold on the market of oxygen zirconium chloride by is a crystallization of income from acid and alkali treatment zirconium materials, process steps for alkali solution, washing, a pickling, acidification, to remove silicon, enrichment and forced crystallization, secondary pickling, although the crystallization process of high efficiency, the crystal obtained uniform, less impurity content, However, due to the limitation of the preparation process, such as industrial hydrochloric acid pickling and forced crystallization by water jacket cooling, this water-soluble concentrated crystal can only be used as the raw material for the preparation of general zirconia. In order to produce ultra-fine zirconia with high purity, this kind of zirconia can not meet the requirements and expand the application field of zirconia.
A high purity ultrafine zirconia production process is provided. The innovation point lies in the recrystallization purification treatment of industrial zirconium oxychloride before burning. Specifically, the production process of a high purity ultrafine zirconium oxide is obtained by burning zirconium oxychloride, which is characterized in the preparation step 1. Recrystallization purification. Industrial zirconium oxychloride was dissolved in purified hydrochloric acid with acidity of 5.5-6.5N at 80-95℃ until the concentration of zirconium oxychloride in the solution was 160-220g/L measured by zirconium oxide. The solution was stirred and cooled to room temperature, and then the solid and liquid were extracted and filtered for separation. 2. Pickling. The recrystallized products were rinsed with pure hydrochloric acid, filtered and centrifugally dried.
The invention takes industrial zirconium oxychloride and purified hydrochloric acid as raw materials to make high purity zirconium oxychloride through recrystallization and purification at a certain acidity and concentration, and then obtains high purity ultrafine zirconium oxide after calcination and grinding. The invention is provided with a hydrochloric acid evaporation device in the process, the pure hydrochloric acid obtained by evaporation is provided with recrystallization in one way, and crystal pickling in the other way. The pickling solution, centrifugal spin-dry solution and the condensed acid after burning are all passed into the hydrochloric acid evaporation device to form an acid cycle, and the secondary zirconium in the bottom kettle of the hydrochloric acid evaporation device is circulated to the recrystallization device.
The invention is used to crush the burning material by mechanical grinding first and then airflow grinding, and the coarse particles are produced by high-pressure airflow with uniform fineness of high purity and ultrafine zirconia products.
The invention purifies zirconium oxychloride by recrystallization, and then burns and smashes the zirconia prepared with high purity, fine particle size and good product quality, which can meet some high requirements. In addition, hydrochloric acid is comprehensively recycled and reused in the process, thus improving the utilization rate of resources.
