Device for preparing crystals through pyrolysis and magnetic separation and method for preparing zirconium oxide by using device
A pyrolysis and magnetic separation technology, used in zirconia, silicon oxide, silicon dioxide, etc., can solve the problems of high production energy consumption and large heat loss of the furnace shell, and achieve improved service life, small footprint, and improved performance. Effect of Granulation Efficiency
Pending Publication Date: 2022-03-25
上海迈徕季冶金设备有限公司
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Problems solved by technology
The smelting reaction is carried out at a high temperature of 2500°C to 3000°C, and the heat loss of the furnace shell is large. The comprehensive power consumption per 1t of zirconia produced is about 6500-9000kw h, and the production energy consumption is relatively high.
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Embodiment 1
[0076] Zircon sand from a concentrator in Indonesia is used as raw material, and its main technical index is ZrO 2 : 65.5%, SiO 2 : 32.8%, Fe 2 o 3 : 0.2%, Al 2 o 3 : 1.0%, 100-mesh sieve 1.98%.
[0077] The pyrolysis additive used in the test is commercially pure calcium oxide, containing 90.2% CaO, and the added amount is 6.0% of the mass of the raw zircon sand.
[0078] Material preparation: Stir and mix the raw material zircon sand and pyrolysis additives evenly, and press the uniformly mixed material powder into 35×25×15 cold-set balls with a pressure of 35 MPa.
[0079] Pyrolysis reaction: The pyrolysis process is carried out in a DC electric arc furnace, and the furnace lining is a self-baking furnace lining formed after zircon sand is preheated, roasted and cooled. The liquid surface diameter of the molten pool is 800mm, the volume of the molten pool is 60L, the electrode diameter is Φ250mm, the average current is 6500A, the average electrode voltage is 135V, the...
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The invention provides a device for preparing crystals through pyrolysis and magnetic separation. The device comprises a pyrolysis furnace, a discharging system, a gravity separation system and a magnetic separation system. Wherein the discharging system comprises a cooling water tower, a cooling water circulating pump, a granulating tank and a scraper discharging machine. Due to the fact that the granulating tank is provided with circulating cooling water, it can be guaranteed that the granulating temperature is stabilized within a reasonable range, and the process water consumption is reduced. The scraper blade discharging machine comprises a horizontal section and an inclined section, the horizontal section is embedded in the granulation groove and has a good stirring effect on granulated products, the granulation efficiency can be improved, and the particle size range width of the products can be improved. The invention also provides a method for preparing crystals by using the device, taking zirconium oxide preparation as an example, pyrolysis can be carried out at a lower temperature such as 1300-1900 DEG C by adding a pyrolysis additive into the pyrolysis furnace in the pyrolysis process, the refractory selection range of the pyrolysis furnace is widened, the service life of the pyrolysis furnace is prolonged, and the energy consumption in the pyrolysis process is reduced.
Description
technical field [0001] The invention relates to the technical field of crystal preparation, in particular to a device for preparing crystals through pyrolysis and magnetic separation, and a method for preparing zirconia using the device. Background technique [0002] Zirconium dioxide is the main oxide of zirconium, which has excellent characteristics such as high wear resistance, high melting point, corrosion resistance, non-conductivity, and non-magnetism, and has low thermal expansion coefficient, high refractive index, and good thermal shock resistance. Important emerging materials in the fields of materials, structural ceramics and functional ceramics. At present, the preparation methods of zirconia mainly include chemical method and electrofusion method. Among them, the high-purity zirconia produced by chemical method has excellent performance, but due to the long process flow and large consumption of reagents, the production process is difficult to protect the environ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C01G25/02C01B33/12
CPCC01G25/02C01B33/12C01P2006/12C01P2006/10C01P2006/80Y02P10/20
Inventor 范远智赵平钱园
Owner 上海迈徕季冶金设备有限公司