Method for purification of baddeleyite to prepare high purity zirconia

Abstract

The invention relates to a purification method of high purity zirconia, particularly to a method for purification of baddeleyite to prepare high purity zirconia. The method is characterized in that: the baddeleyite is subjected to an acidification reaction to convert the zirconia component therein into zirconium sulfate, the zirconium sulfate reacts with lye to generate zirconium hydroxide, and finally after calcinations, the high purity zirconia can be obtained. The method provided in the invention has the advantages of: saving energy, simplifying the production process, improving the production efficiency, solving the environmental protection, and realizing pollution-free discharge. The obtained product has a white color, the mass content of ZrO2 is greater than or equal to 99.5%, and the impurity content is low.

Description

technical field

[0001] The invention relates to a method for purifying high-purity zirconia, in particular to a method for purifying and preparing high-purity zirconia from baddeleyite. Background technique

[0002] The chemical formula of baddeleyite is ZrO 2 Among them, zirconium is 73.9% and oxygen is 26.1%. Natural baddeleyite generally contains ZrO 2 75%~79%, the rest is SiO 2 and Fe 2 o 3 , the main origins of baddeleyite are Brazil and South Africa, the current annual output is about 10,000 tons, and few other places are found, and there is no report in our country. The uses of baddeleyite are mainly in the manufacture of pigments, chemicals, abrasive materials, refractory materials and high-tech ceramics. Baddeleyite belongs to the monoclinic Chang system, the ore is irregular block, and the crystal is small plate. The color is from yellow, brown to black, the Mohs hardness is 6.5, the specific gravity is 5.7-6.0, and the melting point is lower than 2950°C (p...

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