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Zirconium-corundum composite fireproof ball and preparation method thereof

A technology of refractory balls and zirconium corundum, which is applied in the field of composite zirconium corundum refractory balls for spherical hot blast stoves and its preparation, can solve the problems of unfavorable production efficiency, energy saving and consumption reduction, low pebble bed life, and short ball replacement cycle, etc. Improve the compressive strength at room temperature and thermal shock stability, high softening temperature under load, and improve the service life

Inactive Publication Date: 2013-11-06
任健均
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of magnesium-aluminum refractory balls and high-alumina refractory balls in the prior art will result in a short ball replacement cycle, which is not conducive to improving production efficiency and saving energy and reducing consumption.
Therefore, in order to adapt to the large-scale technology of ball hot blast stoves and solve the problems of low life of the pebble bed and frequent ball replacement, it is imperative to develop new material refractory balls

Method used

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  • Zirconium-corundum composite fireproof ball and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] The Φ75 composite zirconium corundum refractory ball used in the high temperature section of a blast furnace spherical hot blast stove has the following ratio (weight percentage): super bauxite: 25wt%, brown corundum: 55wt%, zircon sand: 10wt%, clay: 5wt% %, silica powder: 3.5wt% and 1.5wt% dextrin. After magnetic separation of mineral particles, the dry blending method is used to prepare fine powder; the density of the fine powder is 1.20g / cm 3 The dextrin liquid is mixed and rolled evenly; the mixed and rolled material is made into a ball billet with a molding machine, and the ball billet is naturally dried and dried in a drying oven to make the moisture content below 1.0%, and then sintered in a sintering furnace at 1430 ° C for 16 hours .

Embodiment 2

[0043] The Φ75 composite zirconium corundum refractory ball used in the high temperature section of a blast furnace spherical hot blast stove has the following ratio (weight percentage): super bauxite: 50wt%, brown corundum: 32wt%, zircon sand: 10wt%, clay: 3wt% %, silica powder: 3wt% and 2wt% dextrin. After magnetic separation of mineral particles, the dry blending method is used to prepare fine powder; the density of the fine powder is 1.20g / cm 3 The dextrin liquid is mixed and rolled evenly; the mixed and rolled material is made into a ball billet with a molding machine, and the ball billet is naturally dried and dried in a drying oven to make the moisture content below 1.0%, and then sintered in a sintering furnace at 1430 ° C for 16 hours .

Embodiment 3

[0045] The Φ75 composite zirconium corundum refractory ball used in the high temperature section of a blast furnace spherical hot blast stove has the following ratio (weight percentage): super bauxite: 30wt%, brown corundum: 50wt%, zircon sand: 10wt%, clay: 4wt% %, silica powder: 4wt% and 2wt% dextrin. After magnetic separation of mineral particles, the dry blending method is used to prepare fine powder; the density of the fine powder is 1.20g / cm 3 The dextrin liquid is mixed and rolled evenly; the mixed and rolled material is made into a ball billet with a molding machine, and the ball billet is naturally dried and dried in a drying oven to make the moisture content below 1.0%, and then sintered in a sintering furnace at 1430 ° C for 16 hours .

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Abstract

The invention relates to a zirconium-corundum composite fireproof ball and a preparation method thereof. The zirconium-corundum composite fireproof ball is characterized by being prepared from 25 to 50 wt% of superfine alumina, 32 to 58 wt% of brown corundum, 5 to 15 wt% of zircon sand, 2 to 12 wt% of clay, 1 to 5 wt% of silica micro powder and 1.5 to 2.5 wt% of an organic binder by a sintering process carried out at a temperature of 1430 DEG C for 16 hours. Through utilization of sintering temperature reduction processes comprising control of Fe2O3 content, K2O content and Na2O content of a raw material formula, utilization of fines and addition of an appropriate amount of the silica micro powder, the preparation method improves integrated performances of the zirconium-corundum composite fireproof ball, and can satisfy a requirement on a service life of a modern ball-type hot blast stove high-temperature section fireproof ball.

Description

technical field [0001] The invention relates to a refractory material, in particular to a composite zirconium corundum refractory ball for a ball-type hot blast stove and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the economy and the improvement of the scientific and technological level, the requirements for the variety and quality of ceramic products are getting higher and higher, which has promoted the vigorous development of domestic ceramics, building materials, steel and other industries. With the successful research and development of new material ceramics and the upgrading of ceramic products, manufacturers are also constantly improving the sintering process and production equipment of the products, putting forward higher requirements for blast furnace materials and furnace refractory products. Traditional Refractory products such as clay, high alumina, fused silica, silicon oxide and silicon carbide can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 任健均
Owner 任健均