Properties of Zirconia and Common Preparation Methods

What’s zirconia?

Zirconium dioxide, which has the chemical formula ZrO2, forms the primary oxide. Normal conditions make it a clear, tasteless, smellless, and colorless crystal. It’s insoluble in water and hydrochloric acids. Chemical properties of this crystal are inactive. This material is a high melting point material with high resistance and high thermal expansion. It’s also used as the raw material to make artificial drills.

How to prepare zirconia

1. Chemical method (alkali metallic method).

Zircon concentrate is then added to high heat caustic soda in order to make sodium zirconate. Concentrated hydrochloric acids is used to wash the sodium zirconate and make zirconium dioxide (ZH). Cl2. To make zirconium oxide (ZH) Cl2, dissolve SH2OX zirconiumoxide in water. Ammonia water can then be added. You can burn ZrOH1S to make zirconia.

Also, it is possible to melt zircon in caustic soda, or to purify to get sodium zirconate. Then add hydrochloric or sulfuric acids to precipitate the Zr(OH),4, Na2ZrO3, and other undecomposed products. Perform acid leaching to remove precipitation and then add ammonia water. Zircon can be combined with carbonates and alkaline metal oxides, and calcined into calcium zirconate. Then, it is boiled with hydrochloric to extract impurities.

2. Electrofusion Method for Preparation Zirconia

In an electric arc furnace, zircon is reduced or melted to reduce its salinization. This also results in the enrichment of zirconium. An electric arc furnace at 2700 can completely decompose zircon into silica and liquid ZrO2 but simultaneously SiO2 may be reduced to gaseous SiO2 as well as O2 which can also occur, which is a reversible process.
You can prepare zirconia stable by using either primary or secondary electric melting. Primary electric fusion involves the mixing and grinding of zircon, graphite and stabilizers (usually CaCO3) before adding them to an electric arc furnace. The fused ZrO2 must be quenched to promote crystal development. Once the ZrO2 has cooled, it is Calcined at 1400°C to obtain stable zirconia. Secondary electric melting is where zircon and graphite sand are mixed together with graphite powder. Then, they melt in an electric oven, cool, then burn lightly (about 1400°C), to make mZrO2. To obtain stable zirconia, the mZrO2 can be mixed with a stabilizer according the amount.
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