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Method for purification of baddeleyite to prepare high purity zirconia

The technology of zirconia and baddeleyite is applied in the purification field of high-purity zirconia.

Inactive Publication Date: 2013-08-21
SHANDONG LEIBAO ZIRCONIUM SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the past, high-purity zirconia was prepared by alkaline earth metal oxide decomposition method, carbonation chlorination method and plasma thermal decomposition method, or reaction and purification at more than 2000 degrees, which required a large amount of energy consumption and a large amount of emissions during the production process. The chlorine gas pollutes the environment, and the process is complicated

Method used

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  • Method for purification of baddeleyite to prepare high purity zirconia

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Experimental program
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Effect test

Embodiment 1

[0021] (1) Ingredients: mix baddeleyite powder, industrial ammonium sulfate and sulfuric acid in a mass ratio of 1:3:5;

[0022] (2) Acidification reaction: the above mixture is roasted at 150° C. to make it react to generate sulfate, and the conversion rate is ≥ 93%;

[0023] (3) Leaching: adding sulfate into water for leaching, the temperature is controlled at 55°C, the solid-to-liquid ratio of the product after the acidification reaction and water is 1:4.5, and the leaching time is controlled at 2.5h;

[0024] (4) Filtration: after the leaching ends, carry out solid-liquid separation with a plate and frame machine, and press filter to remove the clear liquid;

[0025] (5) metathesis: neutralize the clear liquid with ammonia water to a pH value of 4;

[0026] (6) Press filtration: the metathesis reaction product is press-filtered with a plate and frame machine;

[0027] (7) Washing: the filter residue that press filtration obtains is washed 3 times with water;

[0028] (8...

Embodiment 2

[0030] (1) Ingredients: mix oblique zirconium powder, ammonium sulfate and sulfuric acid in a mass ratio of 1:2:4;

[0031] (2) Acidification reaction: the above mixture is roasted at 950° C. to make it react to generate sulfate, and the conversion rate is ≥ 93%;

[0032] (3) Leaching: adding sulfate into water for leaching, the temperature is controlled at 55°C, the solid-to-liquid ratio of the product after the acidification reaction and water is 1:5, and the leaching time is controlled at 2.5h;

[0033] (4) Filtration: after the leaching ends, carry out solid-liquid separation with a plate and frame machine, and press filter to remove the clear liquid;

[0034] (5) metathesis: neutralize the clear liquid with ammonia water to a pH value of 5;

[0035] (6) Press filtration: the metathesis reaction product is press-filtered with a plate and frame machine;

[0036] (7) Washing: the filter residue that press filtration obtains is washed 5 times with water;

[0037] (8) Roast...

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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...

Claims

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Application Information

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IPC IPC(8): C01G25/02
Inventor 王光强陈杰刘学燕
Owner SHANDONG LEIBAO ZIRCONIUM SCI&TECH
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