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Compact high-purity zirconium oxide refractory product

A technology of refractory products and zirconia, applied in the field of refractory materials, can solve the problems of high temperature glass melt erosion and damage, high production cost, low porosity, etc., and achieve the effects of ensuring volume stability, shortening production cycle, and reducing porosity.

Active Publication Date: 2020-02-28
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Normally, the glass phase content in AZS fused cast bricks is about 20wt%, and its content directly determines the performance of the product; currently widely used fused cast refractory products have high density, low porosity, erosion resistance, corrosion resistance, and can be produced in large However, fused cast refractory products have the following disadvantages: 1) Most of the raw materials of fused cast bricks are high-melting point materials, and the melting temperature is 2000-2800 ℃, which consumes a lot of energy and high production costs; 2) fused cast refractory products Through casting molding, the production process of quartz sand molds, resin sand molds and other molds used under high temperature conditions is complicated and the reuse rate is low, which greatly reduces the production efficiency of fused cast bricks; 3) The production qualification rate of fused cast zirconia bricks is not high; 4) During the use of molten cast products, there will be glass phase exudation, and the glass phase contains small zirconia crystals dripping into the molten pool, thereby contaminating the glass liquid, resulting in defects such as stones, streaks and nodules in the final product.
Due to the high porosity of this type of material, it is easy to be eroded and damaged by high-temperature glass melt, so it is not suitable for glass kilns; in addition, this type of material has a high shrinkage rate during firing, and it is difficult to prepare large-scale bulk materials

Method used

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  • Compact high-purity zirconium oxide refractory product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 4 kg of fused zirconia particles with a particle size greater than or equal to 0.3 mm and less than or equal to 0.5 mm, and 0.5 kg of fused zirconia fine powder with a particle size greater than or equal to 0.074 mm and less than or equal to 0.1 mm, with a particle size of D 50= 5.5 kg of zirconia granulated powder of 9 μm. Add the granulated powder into the blender and stir. During the stirring process, add the fused zirconia fine powder first, and then add the fused zirconia particles after stirring for 5 minutes. Continue stirring for 20 minutes and mix well. Put the uniformly mixed raw materials directly into the rubber mold, make the required size zirconia bricks under the pressure of 100MPa in the cold isostatic press, dry them at 110°C, and then burn them in the normal pressure non-sealed resistance furnace at 1600°C to obtain dense high-density bricks. Pure zirconia refractory products. The performance parameters of the product are shown in the table belo...

Embodiment 2

[0017] Weigh 8 kg of fused zirconia particles with a particle size greater than or equal to 0.3 mm and less than or equal to 0.5 mm, and 1 kg of sintered zirconia fine powder with a particle size greater than or equal to 0.074 mm and less than or equal to 0.1 mm, with a particle size of D 50 = 11 kg of zirconia granulated powder of 9 μm. Add the granulated powder into the blender and stir. During the stirring process, first add the sintered zirconia fine powder, and then add the fused zirconia particles after stirring for 5 minutes. Continue stirring for 20 minutes and mix well. Put the uniformly mixed raw materials directly into the rubber mold, make the required size zirconia bricks under the pressure of 100MPa in the cold isostatic press, dry them at 110°C, and then burn them in the normal pressure non-sealed resistance furnace at 1600°C to obtain dense high-density bricks. Pure zirconia refractory products. The performance parameters of the product are shown in the table ...

Embodiment 3

[0019] Weigh 10.5 kg of fused zirconia particles with a particle size greater than or equal to 0.3 mm and less than or equal to 0.5 mm, and 3 kg of sintered zirconia fine powder with a particle size greater than or equal to 0.05 mm and less than or equal to 0.074 mm, with a particle size of D 50 = 16.5 kg of zirconia granulated powder of 9 μm. Add the granulated powder into the blender and stir. During the stirring process, first add the sintered zirconia fine powder, and then add the fused zirconia particles after stirring for 5 minutes. Continue stirring for 20 minutes and mix well. Put the uniformly mixed raw materials directly into the rubber mold, and make the required size zirconia adobe under the pressure of 100MPa in the cold isostatic press, dry it at 110°C, and then burn it in the non-sealed resistance furnace at 1650°C at normal pressure to obtain a dense high-density brick. Pure zirconia refractory products. The performance parameters of the product are shown in t...

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Abstract

The invention belongs to the technical field of refractory materials, and provides a compact high-purity zirconium oxide refractory product. The compact high-purity zirconium oxide refractory productcomprises the following raw materials: particles, fine powder and granulation powder, wherein the particles account for 20%-40% of the total mass of the whole refractory product, the fine powder accounts for 5%-15% of the total mass of the whole refractory product, and the granulation powder accounts for 55%-75% of the total mass of the whole refractory product; and the granulation powder also contains a part of an external binding agent, and the content of the binding agent accounts for 3-5% of the total mass of the granulation powder. The compact high-purity zirconium oxide refractory product has the characteristics of low firing temperature, low porosity, high density, high mechanical strength and excellent slag resistance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, in particular to a dense high-purity zirconia refractory product. Background technique [0002] Zirconia has excellent properties such as high strength, high hardness, high service temperature (up to 2400°C or above), good chemical stability, and good resistance to acid and alkali slag erosion. It is an excellent special oxide refractory material. At present, zirconia refractory materials are mainly used in the wall and bottom of the melting part of large float glass melting furnaces, as well as nozzles and slide plates in continuous casting systems. [0003] As we all know, the working conditions of large-scale float glass furnaces are harsh. In the continuous production process, the lining refractory materials will be subjected to very serious physical erosion and chemical erosion. At present, the refractory materials used in glass furnaces are mainly fused-cast zirconium corundum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/482C04B35/622
CPCC04B35/482C04B35/622C04B2235/3225C04B2235/3244C04B2235/9669
Inventor 尚心莲孙红刚杜一昊司瑶晨冯志源夏淼
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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