Electric melting production process for steady zirconium dioxide raw material and technique for producing steady zirconium dioxide product
A technology of zirconia and production methods, applied in the direction of zirconia, etc., can solve problems such as high-temperature non-ferrous metal smelting, easily polluted crystals, and high-quality artificial crystals affecting the development of artificial crystals, so as to promote industry development and avoid electrode pollution , the effect of high purity
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Embodiment 1
[0023] High-purity zirconia (ZrO) prepared by chemical reaction of sodium carbonate 2 ≥99.95% as raw material, impurity content ≤10ppm), select high-purity rare earth oxide Y 2 O 3 (Y 2 O 3 ≥99.99%) as a stabilizer, 94.8% by weight of high-purity zirconia and 5.2% by weight of high-purity yttrium oxide are respectively charged into a mixer for homogenization to prepare a charge. Put the charge into the three-phase electric arc furnace for smelting in batches, control the electrode lift to maintain a long arc (the distance between the electrode and the melt is within 2cm, but not in contact), the melt is gradually fed at 2700 ° C, and the secondary voltage (electrode voltage) is 100 volts, the current is 1200 amps, and the melt is kept warm for another hour (the holding current is 200 amps). Then add material, heat again, and keep warm again, and repeat the above process for many times until a frit with a diameter of about 500mm is obtained, or the size can be determined ac...
Embodiment 2
[0027] According to the method of Example 1, 92% by weight of high-purity zirconia and 8% by weight of high-purity yttrium oxide were respectively charged into a mixer and homogenized to prepare a charge. In the three-phase electric arc furnace, the molten material is gradually fed at 3000 ° C, the secondary voltage (electrode voltage) is 130 volts, the current is 1400 amps, and the temperature is kept for 1 hour to form ready-to-use finished sand or powder (ie high-purity stable zirconia raw material ).
[0028] Using the stabilized zirconia raw materials of different particle sizes (among which the particle size is 5-1mm accounts for 32% of the amount of stabilized zirconia raw materials, ≤1mm accounts for 28%, ≤320 mesh accounts for 40%) 100%, plus starch 5%, Water 6% is mixed in a mixer for 30 minutes, and it is formed by high pressure of ≥100 tons. The semi-finished product is then dried and fired in an ultra-high temperature kiln (2200°C) for 6 hours. After testing and...
Embodiment 3
[0032]According to the method of Example 1, 96% by weight of high-purity zirconia and 8% by weight of light calcium carbonate (equivalent to 4% of calcium oxide) were respectively charged into a mixer and homogenized to prepare a charge. In the three-phase electric arc furnace, the molten material is gradually fed at a temperature greater than 2700 ° C, the secondary voltage (electrode voltage) is 120 volts, the current is 1000 amps, and the temperature is kept for 1 hour to form ready-to-use finished sand or powder (ie high-purity stabilized zirconium dioxide). raw material).
[0033] Using 100% of stabilized zirconia raw materials with different particle sizes (3-1mm particle size accounts for 32% of the stabilized zirconia raw materials, ≤1mm accounts for 28%, and ≤320 mesh accounts for 40%), plus anhydrous alcohol 4 % and 4% of water are mixed in a mixer for 30 minutes, and then molded by high pressure of ≥100 tons. The semi-finished product is then dried and fired in an ...
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