Boron-containing additive for carbide refractory and preparation thereof

Abstract

The invention provides a boron-containing additive for carbon refractory, which is characterized in that the boron-containing ingredients including metal boride, B4C or amorphous boron powder are directly compounded in spongy basal body of Al2O3 or MgO by the in-situ synthesis technology so as to form Al2O3-base or MgO-base boron-containing additive. The product takes loose sponge shape. The invention adopts the boric anhydride and metal oxide, or the boric anhydride and graphite, or the boric anhydride as raw materials, and adopts the aluminum powder or magnesium powder as a reducing agent; the materials and the reducing agent are mixed, activated and are then placed in a self-spreading reacting furnace; the partial ignition mode is adopted to initiate the combustion synthesis reaction so as to produce the Al2O3-base or MgO-base boron-containing additive. The boron-containing additive for carbon refractory has the advantages of simple technique, low production cost and high product purity and does not have secondary pollution caused by crashing in the traditional production technique.

Description

technical field

[0001] The invention belongs to the technical field of preparation of refractory additives, in particular to boron-containing additives for carbonaceous refractory materials and a preparation method thereof. Background technique

[0002] Carbon-containing refractories are widely used in the inner lining of thermal equipment for metallurgical furnaces because the introduction of graphite improves the slag resistance and thermal shock resistance of refractories. High-strength magnesia-carbon bricks are widely used in the lining of various refining furnaces and ladles due to their good thermal shock resistance and slag resistance. For example, use in oxygen converters and circuits can significantly increase furnace life. Aluminum carbon refractories also have good high temperature strength, good thermal shock stability and slag corrosion resistance, and are currently the most common refractory materials for continuous casting. The main refractory materials for...

Examples

Embodiment 1

[0059] Boron gangue, ZrO 2 , aluminum powder and ZrB 2 After mixing, put it into a planetary ball mill, and perform ball milling activation treatment at a speed of 150r / min for 5h, wherein boron gangue, ZrO 2 The mass ratio of ZrO to aluminum powder is 2 : boron gangue: aluminum powder = 100: 50: 75, ZrB 2 The addition amount of the reaction material is 5% of the total mass of the reaction material; the activated material is placed in the self-propagating reaction furnace, and the self-propagating reaction furnace is evacuated. Under the vacuum atmosphere, the ignition mode adopted is resistance wire ignition, resistance wire heating Current 10A, ZrB produced by the reaction 2 In situ compounding in the sponge-like Al 2 o 3 In the matrix, Al 2 o 3 ZrB 2 Additives, the composition of which contains ZrB 2 35%, containing Al 2 o 3 62%, and the balance is impurities.

Embodiment 2

[0061] Boron gangue, ZrO 2 , aluminum powder and ZrB 2 After mixing, put it into a planetary ball mill, and perform ball milling activation treatment at a speed of 200r / min for 20h, wherein boron gangue, ZrO 2 The mass ratio of ZrO to aluminum powder is 2 : boron gangue: aluminum powder = 100: 65: 90, ZrB 2 The addition amount of the reaction material is 8% of the total mass of the reaction material; the activated material is placed in the self-propagating reaction furnace, and the self-propagating reaction furnace is evacuated and filled with argon. Under the argon atmosphere, the ignition mode adopted is resistance The wire is ignited, the resistance wire heating current is 15A, and the ZrB produced by the reaction 2 In situ compounding in the sponge-like Al 2 o 3 In the matrix, Al 2 o 3 ZrB 2 Additives, the composition of which contains ZrB 2 40%, containing Al 2 o 3 56%, and the balance is impurities.

Embodiment 3

[0063] Boron gangue, ZrO 2 , magnesium powder and ZrB 2 After mixing, put it into a planetary ball mill, and perform ball milling activation treatment at a speed of 250r / min for 1h, wherein boron gangue, ZrO 2 The mass ratio of adding magnesium powder and magnesium powder is ZrO 2 : boron gangue: magnesium powder = 100: 50: 110, ZrB 2 The addition amount of the reaction material is 10% of the total mass of the reaction material; the activated material is placed in the self-propagating reaction furnace, and the self-propagating reaction furnace is evacuated and filled with argon. Under the argon atmosphere, the ignition mode adopted is resistance The wire is ignited, the resistance wire heating current is 20A, and the ZrB produced by the reaction 2 In situ complexation in the spongy MgO matrix formed by the reaction to generate MgO-based ZrB 2 Additive, its composition is to contain 28%, contains MgO 68%, and the balance is impurity.

technical field

[0001] The invention belongs to the technical field of preparation of refractory additives, in particular to boron-containing additives for carbonaceous refractory materials and a preparation method thereof. Background technique

[0002] Carbon-containing refractories are widely used in the inner lining of thermal equipment for metallurgical furnaces because the introduction of graphite improves the slag resistance and thermal shock resistance of refractories. High-strength magnesia-carbon bricks are widely used in the lining of various refining furnaces and ladles due to their good thermal shock resistance and slag resistance. For example, use in oxygen converters and circuits can significantly increase furnace life. Aluminum carbon refractories also have good high temperature strength, good thermal shock stability and slag corrosion resistance, and are currently the most common refractory materials for continuous casting. The main refractory materials for...

Examples

Embodiment 1

[0059] Boron gangue, ZrO 2 , aluminum powder and ZrB 2 After mixing, put it into a planetary ball mill, and perform ball milling activation treatment at a speed of 150r / min for 5h, wherein boron gangue, ZrO 2 The mass ratio of ZrO to aluminum powder is 2 : boron gangue: aluminum powder = 100: 50: 75, ZrB 2 The addition amount of the reaction material is 5% of the total mass of the reaction material; the activated material is placed in the self-propagating reaction furnace, and the self-propagating reaction furnace is evacuated. Under the vacuum atmosphere, the ignition mode adopted is resistance wire ignition, resistance wire heating Current 10A, ZrB produced by the reaction 2 In situ compounding in the sponge-like Al 2 o 3 In the matrix, Al 2 o 3 ZrB 2 Additives, the composition of which contains ZrB 2 35%, containing Al 2 o 3 62%, and the balance is impurities.

Embodiment 2

[0061] Boron gangue, ZrO 2 , aluminum powder and ZrB 2 After mixing, put it into a planetary ball mill, and perform ball milling activation treatment at a speed of 200r / min for 20h, wherein boron gangue, ZrO 2 The mass ratio of ZrO to aluminum powder is 2 : boron gangue: aluminum powder = 100: 65: 90, ZrB 2 The addition amount of the reaction material is 8% of the total mass of the reaction material; the activated material is placed in the self-propagating reaction furnace, and the self-propagating reaction furnace is evacuated and filled with argon. Under the argon atmosphere, the ignition mode adopted is resistance The wire is ignited, the resistance wire heating current is 15A, and the ZrB produced by the reaction 2 In situ compounding in the sponge-like Al 2 o 3 In the matrix, Al 2 o 3 ZrB 2 Additives, the composition of which contains ZrB 2 40%, containing Al 2 o 3 56%, and the balance is impurities.

Embodiment 3

[0063] Boron gangue, ZrO 2 , magnesium powder and ZrB 2 After mixing, put it into a planetary ball mill, and perform ball milling activation treatment at a speed of 250r / min for 1h, wherein boron gangue, ZrO 2 The mass ratio of adding magnesium powder and magnesium powder is ZrO 2 : boron gangue: magnesium powder = 100: 50: 110, ZrB 2 The addition amount of the reaction material is 10% of the total mass of the reaction material; the activated material is placed in the self-propagating reaction furnace, and the self-propagating reaction furnace is evacuated and filled with argon. Under the argon atmosphere, the ignition mode adopted is resistance The wire is ignited, the resistance wire heating current is 20A, and the ZrB produced by the reaction 2 In situ complexation in the spongy MgO matrix formed by the reaction to generate MgO-based ZrB 2 Additive, its composition is to contain 28%, contains MgO 68%, and the balance is impurity.