Method for preparing zirconium oxide powder from zircon

A zirconia powder, zirconia technology, applied in zirconia and other directions, can solve the problems of not properly controlling the amount of sodium carbonate, affecting the stability of the product, affecting the recovery rate, etc., to achieve excellent microscopic morphology, saving reaction costs, and improving The effect of reaction speed

Active Publication Date: 2008-01-09
PUYANG REFRACTORIES GRP CO LTD
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Problems solved by technology

In the above reaction steps, zirconium sulfate and silicon dioxide are separated by adding water. During the separation process, the zirconium sulfate solution also contains a certain concentration of sodium sulfate, but it is not removed in the follow-up procedure, so it is bound to Affected the product ZrO after roasting 2 purity; in addition, in the reaction process of the above-mentioned zircon and sodium carbonate, because the amount of sodium carbonate was not well controlled, part of the soluble sodium zirconate was also generated in the reaction described in the patent, and the zirconate in the subsequent process Sodium is separated and removed, resulting in the loss of zirconium, which affects the ZrO to some extent 2 The recovery rate (finally generated ZrO 2 The amount and reaction raw materials of ZrO in zircon 2 The ratio of the amount)
Moreover, in the mesophase Zr(OH) 4 In the process of high-temperature calcination, without adding any auxiliary reagents, then the mesophase is roasted to form ZrO 2 In the process, due to high temperature, the generated ZrO 2 There will be agglomeration, and there will be a certain crystal phase change in the process of lowering from a high temperature state to a room temperature state, accompanied by a certain volume expansion phenomenon, then the volume expansion effect will be in the ZrO that has been generated. 2 Cracks are caused on the crystal plane, which affects the stability of the product

Method used

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  • Method for preparing zirconium oxide powder from zircon

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Embodiment 1

[0021] Zircon with a zirconia content of 63% and a particle size of 43 μm and an analytically pure chemical reagent sodium carbonate were selected as the reaction raw materials in this embodiment.

[0022] Set the oven temperature to 100°C, and dry the above-mentioned zircon and sodium carbonate respectively; take 100g of the dried zircon and 58g of sodium carbonate and mix them uniformly in a ball mill, place them in a corundum crucible, and place them in a high-temperature furnace Incubate at 900°C for 2 hours; take out the above sample after cooling, add water at 90°C to it and stir thoroughly; add hydrochloric acid solution with a concentration of 5mol / L, and adjust the pH value of the above solution to 5; Filter the solution after adjusting the pH value above, wash the obtained solid product with water at the same temperature of 70°C, and then dry the washed product at a temperature of 100°C to obtain 125g of zirconium silicate sodium product.

[0023]Mix the above-menti...

Embodiment 2

[0027] Zircon with a zirconia content of 65% and a particle size of 35 μm and an analytically pure chemical reagent sodium carbonate were selected as the reaction raw materials in this embodiment.

[0028] Set the oven temperature to 100°C, and dry the above-mentioned zircon and sodium carbonate respectively; take 130g of dried zircon and 70g of sodium carbonate and mix them uniformly in a ball mill, and place them in a corundum crucible; The final zircon and sodium carbonate were mixed and placed in a corundum crucible, and kept in a high-temperature furnace at 960°C for 1.5 hours; after the above sample was cooled, it was taken out, and water at a temperature of 80°C was added to it and fully stirred; Concentration is the sulfuric acid solution of 0.8mol / L, adjusts the pH value of above-mentioned solution to be 6; The solution after above-mentioned adjusted pH value is filtered, and the solid product that obtains is washed with the water of 80 ℃ with the same temperature, the...

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Abstract

This invention relates to a method for preparing zirconium oxide. The preparation method is: mixing zircon and soda, reaction under high temperature, cooling the product, adding water and acid; regulation its pH value, filtering, washing and drying the obtained product; the above mentioned product is then added with sodium pyrosulfate, reaction under temperature of 700-800deg.C, cooling, adding water, filtering, washing and drying, obtaining product of powder of mixture of zirconium oxide and silicon oxide; above mentioned mixture is added with solution of sodium hydroxide, reacting under proper pressure and temperature for 2-3hrs, then cooling, separation, washing, drying to obtain the inventive product. This invention has advantages of: low cost, short process, simple operation. And the product is of high pureness, with regular octahedron particles, its size is 1-3um. The power of the inventive product has well dispersiveness, no blocking problem.

Description

technical field [0001] The invention relates to a preparation method of zirconia powder. Background technique [0002] Zirconia has excellent heat resistance, corrosion resistance, wear resistance and plasticity, as well as the characteristics of oxygen ion conduction and phase change toughening, so it has become an important basic raw material in the field of new materials. It has been widely used in the field of refractory materials. In addition, zirconia stabilized by crystal stabilizers can also be used to manufacture ceramic capacitors, gas sensors, electrolyte batteries, ceramic engines, optical glass and fibers, catalysts, etc. Therefore, the whole society has a great demand for zirconia. [0003] However, zirconium that exists in nature mainly exists in the form of minerals such as zircon, baddeley, zircon, curved crystal, etc., and its main component is zirconium silicate (ZrSiO 4 ), is composed of ZrO 2 and SiO 2 A stable compound formed by a very strong chemic...

Claims

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Application Information

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IPC IPC(8): C01G25/02C04B35/622C04B35/48
Inventor 李雪冬史绪波孙荣海陈勇尤士伟
Owner PUYANG REFRACTORIES GRP CO LTD
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