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A fast-baking tundish dry material and its preparation method

A fast, sintered magnesia technology, applied in the field of refractory materials, can solve the problems that the baking effect cannot meet the use requirements, affect the service life of refractory materials, poor compactness and bonding strength, etc., achieve good application prospects, and improve thermal conductivity , low cost effect

Active Publication Date: 2019-11-26
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Tundish dry material is a widely used refractory material for working lining of tundish; the masonry tundish is usually required to be quickly baked to 950-1100°C before use in order to increase the temperature of the refractory lining inside the tundish and remove it. If the baking time is too short, the baking effect will not meet the requirements of use; if the baking time is too long, it will easily lead to the deterioration of the performance of functional components such as nozzles and stoppers assembled; The layer thickness of the dry tundish is usually 50-100mm. In order to achieve a good baking effect, the baking time is generally required to be about 2-4 hours; very important
[0003] The current tundish dry material mainly uses magnesia of different grades and different particle sizes as the main raw material; according to different bonding methods, it can be divided into several types such as carbon bonding, inorganic salt bonding and oxide powder bonding; among them, carbon bonding magnesium Dry-type materials are widely used because of their good high temperature resistance and corrosion resistance; in this type of magnesia-carbon refractory materials, the matrix part mainly composed of binder and magnesia fine powder has poor compactness and bonding strength. Once the carbonaceous material used as the binding phase is lost due to oxidation and other reasons, the magnesia fine powder in the matrix material is difficult to sinter effectively at a lower temperature, which will easily cause the magnesia fine powder to fall off under the scouring of the molten pool, affecting the refractoriness Material service life; In order to solve this problem, document 1 (publication number CN101423417A) provides a kind of low-carbon magnesia-carbon brick containing metallic iron, and document 2 (publication number CN103387396A) provides a kind of vanadium extracting converter containing metallic iron Magnesia-carbon bricks, these two patents are added to magnesia-carbon refractory products in the form of metallic iron, using the volume expansion effect produced by the oxidation of metallic iron to improve the compactness of the decarburized layer and improve the bonding of the matrix part of the decarburized layer strength, improve the erosion resistance and service life of the decarburized layer; but for the tundish dry material, as an amorphous refractory material, its density is worse than the above two refractory products, and the tundish dry material is baked The temperature is lower than the service temperature of the above two refractory products, so good baking performance is solve The key to fast roasting of tundish dry material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The raw material components of the fast-baking tundish dry material are 66% by weight of sintered magnesia particles, 17% of sintered magnesia fine powder, 10% of metal iron powder, 5% of carbonaceous binder, and 2% of additives. %; Described carbonaceous binding agent is phenolic resin, and the weight content of its fixed carbon is 46.2%; Described additive is alumina powder, and its Al 2 o 3 The weight content is 98.5%, the particle size is ≤325 mesh;

[0025] Among them, the sintered magnesia particles are the part of the sintered magnesia with a particle size of ≤3mm and >200 mesh, and the sintered magnesia fine powder is the part of the sintered magnesia with a particle size of ≤200 mesh; the weight percentage of the sintered magnesia particles and the sintered magnesia fine powder ≥90%; Fe weight percentage in metal iron powder ≥95%, particle size ≤180 mesh;

[0026] The preparation method is:

[0027] Premix sintered magnesia fine powder, metallic iron powder,...

Embodiment 2

[0032] The raw material components of the fast-baking tundish dry material are 64% by weight of sintered magnesia particles, 24% of sintered magnesia fine powder, 5% of metal iron powder, 4% of carbonaceous binder, and 3% of additives. %; the carbonaceous binder is industrial sucrose; the additive is silicon powder, with a weight purity ≥ 98%, and a particle size ≤ 200 mesh; all the other are the same as in Example 1;

[0033] Method is with embodiment 1, and difference is:

[0034] The premixing time is 23 minutes, and the sintered magnesia particles are added and mixed for 20 minutes;

[0035] After the dry material of the tundish is formed by vibration construction, it is baked at 1000°C for 1.0h to make a tundish working lining with a thickness of 100mm, and its bulk density is 2.72g / cm 3 , the apparent porosity is 21.5%, and the normal temperature compressive strength is 42.3MPa; the service life of the working lining of the tundish is 28 hours.

Embodiment 3

[0037] The raw material components of the fast-baking tundish dry material are 65% by weight of sintered magnesia particles, 20% of sintered magnesia fine powder, 8% of metal iron powder, 4.5% of carbonaceous binder, and 2.5% of additives. %; Described carbonaceous binding agent is the equal mass mixture of phenolic resin and industrial sucrose; Described additive is B 4 C powder, weight purity ≥ 98%, particle size ≤ 200 orders; all the other are the same as embodiment 1;

[0038] Method is with embodiment 1, and difference is:

[0039] The premixing time is 25 minutes, and the sintered magnesia particles are added and mixed for 18 minutes;

[0040] After the dry material of the tundish is formed by vibration construction, it is baked at 950°C for 1.5h to make a tundish working lining with a thickness of 80mm, and its bulk density is 2.76g / cm 3 , the apparent porosity is 20.8%, and the normal temperature compressive strength is 35.2MPa; the service life of the working lining...

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PUM

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Abstract

A fast baking tundish dry material and its preparation method. The raw material components are 61-66% sintered magnesia particles, 17-24% sintered magnesia fine powder and 5-10% metal iron powder in terms of weight percentage. Carbonaceous binders account for 4 to 5%, and additives account for 2 to 3%; the preparation method is: (1) premix sintered magnesia fine powder, metallic iron powder, carbonaceous binders and additives in a sand mixer; ( 2) Add sintered magnesia particles and continue mixing. The fast baking tundish dry material provided by the invention can significantly improve the thermal conductivity of the dry material layer, effectively shorten the baking time, reduce the amount of oxide powder, and reduce production costs; the method of the invention has a simple production process, The cost is low, the product has long service life and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, in particular to a quick-baking tundish dry material and a preparation method thereof. Background technique [0002] Tundish dry material is a widely used refractory material for working lining of tundish; the masonry tundish is usually required to be quickly baked to 950-1100°C before use in order to increase the temperature of the refractory lining inside the tundish and remove it. If the baking time is too short, the baking effect will not meet the requirements of use; if the baking time is too long, it will easily lead to the deterioration of the performance of functional components such as nozzles and stoppers assembled; The layer thickness of the dry tundish is usually 50-100mm. In order to achieve a good baking effect, the baking time is generally required to be about 2-4 hours; very important. [0003] The current tundish dry material mainly uses magnesia of different grade...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/02C22C29/12C22C1/05
CPCB22D41/02B22D41/023C22C1/051C22C29/12
Inventor 陈敏高嵩王楠徐磊叶振川
Owner NORTHEASTERN UNIV LIAONING