1. The calcium zirconate carbon brick is characterized in that: comprises the following raw materials in percentage by weight: 50-90% of calcium zirconate material, 0-40% of zirconia material, 8-15% of carbon material, 0.5-5% of antioxidant and 2-4% of binding agent.

2. The calcium zirconate carbon brick as claimed in claim 1, wherein: the zirconia material has a zirconia content greater than 90%.

3. The calcium zirconate carbon brick as claimed in claim 1, wherein: the antioxidant comprises one or more of simple substance silicon, silicon carbide, zirconium diboride and boron carbide.

4. The calcium zirconate carbon brick as claimed in claim 1, wherein: the binding agent is phenolic resin.

5. A preparation method of calcium zirconate carbon bricks is characterized by comprising the following steps: application to any of claims 1-4, comprising the steps of:

weighing raw materials in proportion, and then sequentially pouring the raw materials into a high-speed mixing mill for mixing for more than or equal to 30 minutes;

placing the mixture in a room at 25 +/-5 ℃ for more than 12 hours;

the brick shape required by high-pressure forming is formed, and the forming pressure is more than 250 MPa;

placing the formed green brick in a room at 25 +/-5 ℃ for more than 12 hours;

drying the green brick in a drying kiln at the drying temperature of 200 +/-10 ℃ for more than 18 hours;

and packaging and warehousing the dried bricks after quality inspection is qualified.

Background

For steel cordsThe finished wire has a very small wire diameter (generally below 0.3 mm) and if the steel contains hard inclusions (e.g. Al) with a size greater than 5 μm₂O₃Etc.) is large, the rate of filament breakage during draw twisting is difficult to control. In order to reduce the content of brittle inclusion oxides, nitrides and titanides in steel as far as possible and reduce the size of residual trace brittle inclusions to be less than 5 mu m which is not harmful to drawing broken wires, the process requires that steelmaking raw materials and refractory materials with ultralow Al and Ti contents and an inclusion modification treatment furnace external refining process are selected, and an acid covering agent with a Ca/Si ratio of 0.9-1.1 is adopted.

The prior lining materials for the steel ladle mainly comprise zircon bricks (CN87101328A), magnesia carbon bricks, alumina-based bricks and casting materials, such as: aluminum spinel or aluminum-magnesium castable (CN1337376A), alumina-magnesia carbon brick, high-alumina brick, unfired magnesia brick, and the like.

When the brick containing alumina and the casting material are used as the lining material of the steel ladle, the cord steel is polluted to form hard alumina inclusion, so that the use requirement cannot be met. When the magnesia carbon brick is used as a lining material of a ladle, the magnesia carbon brick has the defects of easy reaction with acid slag, serious damage and short service life. When the zircon brick is used as a lining material of a ladle, the disadvantage of poor slag penetration resistance exists, and the service life is quite short.

Disclosure of Invention

Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a calcium zirconate carbon brick which comprises the following raw materials in percentage by weight: 50-90% of calcium zirconate material, 0-40% of zirconia material, 8-15% of carbon material, 0.5-5% of antioxidant and 2-4% of binding agent.

The technical scheme of the invention is further defined as follows:

in the calcium zirconate carbon brick, the zirconia content in the zirconia material is more than 90 percent.

The antioxidant of the calcium zirconate carbon brick comprises one or more of simple substance silicon, silicon carbide, zirconium diboride and boron carbide.

In the calcium zirconate carbon brick, the binding agent is phenolic resin.

The invention also aims to provide a preparation method of the calcium zirconate carbon brick, which comprises the following steps:

weighing raw materials in proportion, and then sequentially pouring the raw materials into a high-speed mixing mill for mixing for more than or equal to 30 minutes;

placing the mixture in a room at 25 +/-5 ℃ for more than 12 hours;

the brick shape required by high-pressure forming is formed, and the forming pressure is more than 250 MPa;

placing the formed green brick in a room at 25 +/-5 ℃ for more than 12 hours;

drying the green brick in a drying kiln at the drying temperature of 200 +/-10 ℃ for more than 18 hours;

and packaging and warehousing the dried bricks after quality inspection is qualified.

The invention has the beneficial effects that: the calcium zirconate carbon brick is prepared by adopting calcium zirconate, zirconia and carbon materials as main raw materials, phenolic resin as a bonding agent and adding an antioxidant, and has higher strength and oxidation resistance within the temperature range of normal temperature to 1650 ℃. The calcium zirconate carbon brick has excellent molten steel erosion resistance, acid slag resistance, thermal shock resistance and oxidation resistance. When it is used as lining material for steel ladle and tundish in smelting tyre cord steel, spring steel, etc., it has no pollution to molten steel and long service life. Compared with the brick or castable containing alumina, the brick has the advantage of not generating hard alumina inclusions in the using process. Compared with magnesia carbon bricks and zircon bricks, the service life is longer.

Detailed Description

The preparation method of the calcium zirconate carbon brick provided by the embodiment comprises the following steps:

weighing the raw materials in proportion, and then sequentially pouring the raw materials into a high-speed mixing roll for 48 minutes;

standing at 26 deg.C for 12.5 hr;

forming a brick shape required by high pressure, wherein the forming pressure is 270 MPa;

placing the formed green brick in a room at 26 ℃ for 13 hours;

drying the green bricks in a drying kiln at the drying temperature of 198 ℃ for 18 hours;

and packaging and warehousing the dried bricks after quality inspection is qualified.

The components and properties are shown in table 1, and the components and properties of the zircon brick and the aluminum-magnesium castable are shown in table 2.

TABLE 1 composition (weight percent) and Properties of calcium zirconate carbon bricks

TABLE 2 Components (percentages by weight) and Properties of the zircon brick and the Al-Mg castable

	Zircon brick	Aluminum-magnesium castable
			ZrO2	58～64
SiO2	34～35
			Al2O3	1～6	80～90
MgO	-	3～8
			Body density, g/cm3	3.68～3.72	2.9～3.20
Showing pores,% of	14～16	15～20
			Compressive strength, MPa	70～100	70～120
Acid-resistant slag	Superior food	Good wine
			Thermal shock resistance	Good wine	Good wine
Service life	Short length	Is out of use

Therefore, the calcium zirconate carbon brick prepared by the invention has excellent molten steel erosion resistance, acid slag resistance, thermal shock resistance and oxidation resistance. When the brick is used as the lining of a steel ladle and a tundish in smelting steel grades such as cord steel, spring steel and the like, the brick has the characteristics of no pollution to molten steel and quite long service life.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.