Binding agent powder for magnesian castable and preparation method thereof

A magnesia castable and binder technology, applied in the field of magnesia castable binder powder and its preparation, can solve the problem of reducing the slag resistance of the magnesia castable, accelerating the dissolution reaction of silica fume, and reducing the fluidity of the castable. and other problems, to achieve the effect of enhancing anti-cracking and anti-slag performance, improving anti-slag performance and reducing content

Inactive Publication Date: 2018-03-09
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a high content of silicon oxide will reduce the slag resistance of magnesia castables and add oxygen to molten steel to reduce the quality of molten steel, or use the method of adding silicate additives to accelerate the dissolution reaction of silica fume, thereby accelerating the magnesia quality. Formation of magnesium silicon hydrate in castable
However, silicate additives will reduce the fluidity of castables and affect construction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A binder powder for magnesium castables and a preparation method thereof. The preparation method described in this embodiment is:

[0020] First, 58~65wt% silicon oxide fine powder and 35~42wt% magnesia fine powder are used as raw materials, stirred evenly, put into a ball mill jar, and then add 6~10wt% of the raw materials into the ball mill jar and 220-300wt% water of the raw material, ball milling for 1-3 hours to prepare a slurry. Put the slurry at 25~40 o C for 60-84 hours, finely ground to a particle size of o C condition for 2 to 4 hours to prepare the binder powder for magnesia castables.

[0021] In this embodiment: the magnesia fine powder is fused magnesia; the additive is sodium lignosulfonate.

[0022] After using the binder powder for magnesia castables prepared in this example, it was tested: baked at 110°C for 24 hours, the flexural strength was 10-13MPa, and the compressive strength was 55-61MPa; the sample was demolded After that, it is directly pl...

Embodiment 2

[0024] A binder powder for magnesium castables and a preparation method thereof. The preparation method described in this embodiment is:

[0025] First, 51~58wt% silicon oxide fine powder and 42~49wt% magnesia fine powder are used as raw materials, stirred evenly, put into a ball mill jar, and then add 5~9wt% of the raw material additives to the ball mill jar and 200-280wt% water of the raw material, ball milling for 1-3 hours to prepare a slurry. Put the slurry at 35~50 o Cured for 48-72 hours under C conditions, finely ground to a particle size of o C conditions for 3 to 5 hours of heat preservation to prepare the binder powder for magnesia castables.

[0026] In this embodiment: the magnesium fine powder is magnesium hydroxide; the additive is sodium hexametaphosphate.

[0027] After using the binder powder for magnesia castables prepared in this example, it was tested: baked at 110°C for 24 hours, the flexural strength was 11-14MPa, and the compressive strength was 58-6...

Embodiment 3

[0029] A binder powder for magnesium castables and a preparation method thereof. The preparation method described in this embodiment is:

[0030] First, use 44~51wt% silicon oxide fine powder and 49~56wt% magnesia fine powder as raw materials, stir evenly, put them into a ball mill jar, and then add 4~8wt% of the raw material additives into the ball mill jar and 180-260wt% water of the raw material, ball milling for 1-3 hours to obtain a slurry. Put the slurry at 45~60 o C for 36-60 hours, finely ground to a particle size of o C conditions for 4 to 6 hours of heat preservation to prepare the binder powder for magnesia castables.

[0031] In this embodiment: the magnesia fine powder is light-burned magnesia; the additive is sodium hexametaphosphate.

[0032] After using the binder powder for magnesia castables prepared in this example, it was tested: baked at 110°C for 24 hours, the flexural strength was 12-15MPa, and the compressive strength was 61-67MPa; the sample was dem...

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Abstract

The invention relates to binding agent powder for a magnesian castable and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: firstly, uniformly stirring 30-65wt% of silicon oxide fine powder and 35-70wt% of magnesian fine powder as raw materials, putting the powder in a ball-milling tank, and then adding 2-10wt% of an additive and 150-300wt% of water based on the weight of the raw materials into the ball-milling tank to be ball-milled for 1-3h to prepare pulp; conserving the pulp for 12-84h at 25-80 DEG C, and grinding the pulp till the grain size is smaller than 75mu m to prepare pre-prepared powder; and keeping the temperature of the pre-prepared powder at 150-650 DEG C for 2-8h to obtain the binding agent powder for magnesian castable. The application result of the binding agent powder for magnesian castable prepared by the preparation method shows that the strength of the magnesian castable is improved remarkably, and the burst resistance and slag resistance of the magnesian castable are enhanced remarkably.

Description

technical field [0001] The invention belongs to the technical field of binder powder. Specifically relates to a binder powder for magnesium castables and a preparation method thereof. Background technique [0002] Magnesium castables are used in metallurgical containers produced by clean steel due to their high refractoriness, excellent resistance to alkaline slag erosion and no pollution to molten steel. Binders for magnesia castables include calcium aluminate cement, silica fume and silica sol. Calcium aluminate cement-bonded castables have high early strength, but the introduction of CaO into the cement binder tends to produce a low-melt phase under high temperature conditions, which reduces the high-temperature performance of the material. The sol-bonded castable has a long curing time, low demoulding strength, and is difficult to demould, and the silica sol binder is not conducive to storage and transportation. Silica fume is often added to the matrix composition of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B35/05
CPCC04B35/043C04B35/05C04B2235/3418C04B2235/95C04B2235/96C04B2235/9607C04B2235/9669
Inventor 李亚伟张雨桑绍柏戴亚洁徐义彪
Owner WUHAN UNIV OF SCI & TECH
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