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A kind of preparation method of fused zirconia for metal zirconium matrix raw material

A technology for fused zirconium oxide and metal zirconium, which is applied in the field of inorganic materials, can solve problems such as affecting the normal performance of metal zirconium and difficult to remove alkali metals, and achieves the effect of eliminating alkali metal residues and improving application performance.

Active Publication Date: 2022-04-26
SANXIANG ADVANCED MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the field of purification of fused zirconia, the Chinese invention patent application number: 200410010365.9 discloses a production method of high-purity zirconia, which mentions the use of alkali metal lithium, sodium, potassium, rubidium, cesium and francium Halides are used as purifying agents, and it is also seen that alkali soaking high-temperature fused zirconia is used to purify fused zirconia. The above methods can remove impurities such as aluminum and titanium in fused zirconia to a certain extent, but they will There are traces of alkali metals such as potassium and sodium remaining in fused zirconia. If it is used as a raw material for metal zirconium, the alkali metal is difficult to remove and will affect the normal performance of metal zirconium.

Method used

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preparation example Construction

[0010] The technical solution of the present invention is: a method for preparing fused zirconia as raw material for metal zirconium matrix, comprising the following steps:

[0011] Mix zircon sand and carbon reducing agent and put them into the electric arc furnace for desiliconization reaction. After the desiliconization reaction is completed, add magnesium halide and carbon as purifying agents into the furnace for purification reaction. After the reaction, use high-pressure air to The melt is blown into the collection chamber to obtain low-aluminum and low-titanium fused zirconia with a purity of more than 99.8% and microsilica fume containing magnesia and magnesium silicate by-products, and the obtained fused zirconia is the metal zirconium matrix The raw material is fused zirconia.

[0012] The reaction principles of the purifying agent magnesium halide and carbon in the above-mentioned technical scheme and the oxides such as aluminum, silicon, titanium in the zirconia ar...

Embodiment 1

[0028] Mix 1000kg of raw material zircon sand into 100kg of crushed graphite and put it into an electric arc furnace for desiliconization reaction. After the desiliconization is completed, 30 kg of purifying agent magnesium fluoride and 8.5 kg of pitch coke are added in the molten state to react at high temperature for 15 minutes, poured out of the furnace and collected to obtain low-aluminum, low-titanium zirconia with a purity of 99.90%-99.94%. The content of aluminum oxide in the product detected by chemical analysis is 0.016%, the content of titanium oxide is 0.025%, and the content of silicon dioxide is 0.007%.

[0029] In the above raw materials, the grade of zircon sand is ≥64%, the (U+Th) content is ≤500ppm, the purity of magnesium halide is ≥99.0%, and the carbon content is ≥98.5wt%.

Embodiment 2

[0031] Mix 1000kg of raw material zircon sand into 100kg of crushed graphite and put it into an electric arc furnace for desiliconization reaction. After the desiliconization is completed, 25kg of the purifying agent magnesium fluoride and magnesium chloride mixture and 6kg of pitch coke are added in the molten state to react at high temperature for 30 minutes, poured out of the furnace and collected to obtain low-aluminum and low-titanium zirconia with a purity of 99.87%-99.95%. The content of aluminum oxide in the product detected by chemical analysis is 0.021%, the content of titanium oxide is 0.026%, and the content of silicon dioxide is 0.011%.

[0032] In the above raw materials, the grade of zircon sand is ≥64%, the (U+Th) content is ≤500ppm, the purity of magnesium halide is ≥99.0%, and the carbon content is ≥98.5wt%.

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Abstract

The invention relates to the technical field of inorganic materials, in particular to a method for preparing fused zirconia as a raw material for metal zirconium matrix, comprising the following steps: adding purifying agent magnesium halide and Carbon reacts for a certain period of time, so that impurities such as silicon, aluminum, and titanium in zirconia after desiliconization are converted into low-boiling gaseous compounds and separated from zirconia melt, and then carbon reacts with magnesia to generate carbon dioxide and metal magnesium to escape from zirconia molten pool, so as to achieve the purpose of removing impurities and purifying zirconia, and producing low-alumina and low-titanium zirconia with a purity of more than 99.8%. The preparation method of the invention effectively eliminates the residue of alkali metal harmful elements in the existing high-purity zirconium. In addition, the by-product of the smelting process is micro-silica powder containing magnesia and magnesium silicate, which improves the application performance of micro-silica powder in downstream fields.

Description

technical field [0001] The invention relates to the technical field of inorganic materials, in particular to a preparation method of fused zirconia used as a metal zirconium matrix raw material. Background technique [0002] The industrial production of zirconia is mainly used in the fields of refractory materials and ceramic pigments, and its production processes mainly include chemical methods and electrofusion methods. Although the chemical method has high purity, its cost is high; the traditional electric melting method has the advantages of stable quality and low cost, but the main disadvantage is that the purity is relatively low, and oxide impurities such as aluminum and titanium pass through the normal electric arc furnace at high temperature. Smelting cannot be removed. The oxides of aluminum and titanium are the most stringent impurity components in metal zirconium. The existence of aluminum and titanium impurities has a relatively large negative impact on the phy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/14C22B5/10C22B9/10
CPCC22B34/14C22B5/10C22B9/10
Inventor 包晓刚魏爽叶旦旺林少云
Owner SANXIANG ADVANCED MATERIALS