A kind of magnesium casting material and preparation method thereof

Abstract

The invention relates to a magnesium casting material and a preparation method thereof. The technical solution is: mix magnesia fine powder, quartz sand fine powder, silicon micropowder, ferrosilicon nitride, magnesium citrate and thermosetting phenolic resin evenly, press molding, and heat treatment in a neutral atmosphere at 800-1100°C for 3 ~ 5 hours, after crushing, ball milling and sieving, ball abrasives with a particle size of less than 0.088mm and granular materials with a particle size of 0.088-0.25mm are obtained; Powder, hydroxyethyl cellulose and water are mixed and ball milled to obtain a slurry; then the magnesia particles, the magnesia fine powder, the ball mill, the granules, the slurry, polyvinyl alcohol fiber and The water reducer is stirred evenly and formed by vibration to obtain a magnesium castable. The prepared magnesia casting material has wide source of raw materials and low production cost, and the prepared magnesia casting material has excellent high temperature resistance, high strength and excellent slag erosion resistance.

Description

technical field

[0001] The invention belongs to the field of castable technology. Specifically relates to a magnesium castable and a preparation method thereof. Background technique

[0002] Magnesia refractory is an important basic refractory material and an indispensable lining material for high-temperature industrial kilns. With the increasing development of steel, cement, glass and chemical industries, countries around the world are researching and developing new varieties of magnesia refractories. , Improving product quality, prolonging service life and reducing refractory consumption have made great progress. As far as magnesia castables are concerned, they are widely used in high-temperature industrial kilns due to their advantages of high refractoriness, high softening temperature under load and purification of molten steel. However, due to the large coefficient of thermal expansion, the cracking and peeling resistance of the material are poor, which reduces the se...

Examples

Embodiment 1

[0040] A magnesium castable and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0041] The first step, 55-65wt% magnesia fine powder, 1-5wt% quartz sand fine powder, 5-10wt% silicon micropowder, 5-10wt% ferrosilicon nitride, 2-5wt% citric acid Magnesium and 10-15wt% thermosetting phenolic resin are uniformly mixed, pressed and molded under the condition of 60-80MPa, then heat-treated in a neutral atmosphere at 900-1100°C for 3-5 hours, and then crushed, ball-milled and sieved to obtain Ball abrasives with a particle size of less than 0.088mm and granular materials with a particle size of 0.088-0.25mm.

[0042] In the second step, 25-35wt% of the silicon powder, 1-5wt% of the ferrosilicon nitride, 0.1-1wt% citric acid, 5-10wt% elemental silicon powder, 0.1-0.5wt% The hydroxyethyl cellulose is mixed with 55-65 wt % of water and ball milled to obtain slurry.

[0043] The third step, the magnesia particle of 45~55wt%, the de...

Embodiment 2

[0046] A magnesium castable and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0047] The first step, 60-70wt% magnesia fine powder, 5-10wt% quartz sand fine powder, 1-5wt% silicon micropowder, 5-10wt% ferrosilicon nitride, 2-5wt% citric acid Magnesium and 5-10wt% thermosetting phenolic resin are uniformly mixed, pressed and molded under the condition of 50-70MPa, then heat-treated in a neutral atmosphere and 800-1000°C for 3-5 hours, and then crushed, ball-milled and sieved to obtain Ball abrasives with a particle size of less than 0.088mm and granular materials with a particle size of 0.088-0.25mm.

[0048] In the second step, 30-40wt% of the silicon powder, 5-10wt% of the ferrosilicon nitride, 0.1-1wt% of citric acid, 1-5wt% of elemental silicon powder, 0.5-1wt% of hydroxyl The ethyl cellulose is mixed with 50-60 wt% of water and ball milled to obtain slurry.

[0049] The third step, the magnesia particle of 50~60wt%...

Embodiment 3

[0052] A magnesium castable and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0053] The first step, 60-70wt% magnesia fine powder, 5-10wt% quartz sand fine powder, 5-10wt% silicon micropowder, 1-5wt% ferrosilicon nitride, 0.5-2wt% citric acid Magnesium and 10-15wt% thermosetting phenolic resin are uniformly mixed, pressed and molded under the condition of 60-80MPa, then heat-treated in a neutral atmosphere at 900-1100°C for 3-5 hours, and then crushed, ball-milled and sieved to obtain Ball abrasives with a particle size of less than 0.088mm and granular materials with a particle size of 0.088-0.25mm.

[0054] In the second step, 30-40wt% of the silicon micropowder, 5-10wt% of the ferrosilicon nitride, 0.1-1wt% of citric acid, 5-10wt% of elemental silicon powder, 0.1-0.5wt% of The hydroxyethyl cellulose is mixed with 40-50 wt% of water and ball milled to obtain a slurry.

[0055] The third step, the magnesia particles ...

technical field

[0001] The invention belongs to the field of castable technology. Specifically relates to a magnesium castable and a preparation method thereof. Background technique

[0002] Magnesia refractory is an important basic refractory material and an indispensable lining material for high-temperature industrial kilns. With the increasing development of steel, cement, glass and chemical industries, countries around the world are researching and developing new varieties of magnesia refractories. , Improving product quality, prolonging service life and reducing refractory consumption have made great progress. As far as magnesia castables are concerned, they are widely used in high-temperature industrial kilns due to their advantages of high refractoriness, high softening temperature under load and purification of molten steel. However, due to the large coefficient of thermal expansion, the cracking and peeling resistance of the material are poor, which reduces the se...

Examples

Embodiment 1

[0040] A magnesium castable and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0041] The first step, 55-65wt% magnesia fine powder, 1-5wt% quartz sand fine powder, 5-10wt% silicon micropowder, 5-10wt% ferrosilicon nitride, 2-5wt% citric acid Magnesium and 10-15wt% thermosetting phenolic resin are uniformly mixed, pressed and molded under the condition of 60-80MPa, then heat-treated in a neutral atmosphere at 900-1100°C for 3-5 hours, and then crushed, ball-milled and sieved to obtain Ball abrasives with a particle size of less than 0.088mm and granular materials with a particle size of 0.088-0.25mm.

[0042] In the second step, 25-35wt% of the silicon powder, 1-5wt% of the ferrosilicon nitride, 0.1-1wt% citric acid, 5-10wt% elemental silicon powder, 0.1-0.5wt% The hydroxyethyl cellulose is mixed with 55-65 wt % of water and ball milled to obtain slurry.

[0043] The third step, the magnesia particle of 45~55wt%, the de...

Embodiment 2

[0046] A magnesium castable and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0047] The first step, 60-70wt% magnesia fine powder, 5-10wt% quartz sand fine powder, 1-5wt% silicon micropowder, 5-10wt% ferrosilicon nitride, 2-5wt% citric acid Magnesium and 5-10wt% thermosetting phenolic resin are uniformly mixed, pressed and molded under the condition of 50-70MPa, then heat-treated in a neutral atmosphere and 800-1000°C for 3-5 hours, and then crushed, ball-milled and sieved to obtain Ball abrasives with a particle size of less than 0.088mm and granular materials with a particle size of 0.088-0.25mm.

[0048] In the second step, 30-40wt% of the silicon powder, 5-10wt% of the ferrosilicon nitride, 0.1-1wt% of citric acid, 1-5wt% of elemental silicon powder, 0.5-1wt% of hydroxyl The ethyl cellulose is mixed with 50-60 wt% of water and ball milled to obtain slurry.

[0049] The third step, the magnesia particle of 50~60wt%...

Embodiment 3

[0052] A magnesium castable and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0053] The first step, 60-70wt% magnesia fine powder, 5-10wt% quartz sand fine powder, 5-10wt% silicon micropowder, 1-5wt% ferrosilicon nitride, 0.5-2wt% citric acid Magnesium and 10-15wt% thermosetting phenolic resin are uniformly mixed, pressed and molded under the condition of 60-80MPa, then heat-treated in a neutral atmosphere at 900-1100°C for 3-5 hours, and then crushed, ball-milled and sieved to obtain Ball abrasives with a particle size of less than 0.088mm and granular materials with a particle size of 0.088-0.25mm.

[0054] In the second step, 30-40wt% of the silicon micropowder, 5-10wt% of the ferrosilicon nitride, 0.1-1wt% of citric acid, 5-10wt% of elemental silicon powder, 0.1-0.5wt% of The hydroxyethyl cellulose is mixed with 40-50 wt% of water and ball milled to obtain a slurry.

[0055] The third step, the magnesia particles ...