Unfired alumina-magnesite carbon brick and preparation method thereof

Abstract

The invention belongs to the technical fields of advanced fireproof materials for electric furnaces, converter linings and steel ladle linings and preparation thereof, and relates to an unfired alumina-magnesite carbon brick and a preparation method thereof. The unfired alumina-magnesite carbon brick is prepared from aggregate, powder, an additive and a binding agent in parts by weight: 60 to 70 parts of brown aluminum oxide and / or special alumina; 1 to 3 parts of magnesium aluminate spinel, 9 to 11 parts of high-purity magnesia, and 11 to 13 parts of sub-white corundum; 2 to 4 parts of the additive; 5 to 7 parts of graphite, 1 to 3 parts of high-temperature pitch, 0.2 to 0.5 part of rare earth oxide, 3 to 5 parts of a ceramic binding agent, 3 to 4 parts of a complexing magnalium grouting agent and 1 to 3 parts of water. The unfired alumina-magnesite carbon brick has the advantages that the preparation method is simple and safe, the cost is low, high-temperature firing is not needed, the density is large and the strength is high.

Description

technical field

[0001] The invention belongs to the technical field of high-grade refractory materials for electric furnaces, converter linings and ladle linings and their preparation, and in particular relates to a non-fired alumina-magnesia-carbon brick and a preparation method thereof. Background technique

[0002] Aluminum magnesia carbon brick is based on Al 2 o 3 , MgO and C as the main components of carbon-containing refractories, containing Al2O360% ~ 69%, MgO7% ~ 14%, C5% ~ 12%. It has good slag erosion resistance and thermal shock resistance, and has a small amount of reburning expansion. It is mainly used for electric furnace, converter lining and ladle lining. Although the existing alumina-magnesia-carbon bricks meet certain requirements for use, there are still problems such as high price and short service life. Therefore, how to reduce costs and develop green and environmentally friendly refractory materials with high efficiency and long service life has alw...

Examples

Embodiment 1

[0037] The raw materials were weighed according to the components specified in Table 1 below, and the preparation method was as follows.

[0038] (1) Raw material processing

[0039] Aggregate: Weigh brown corundum and or super-grade bauxite according to parts by weight, put them into a jaw crusher for crushing, and crush them into large particles, then crush them with rollers, and then use a vibrating screen to screen out the aggregates with a particle size of 0.1-5mm. When changing materials for crushing and crushing, first clean up the accumulated materials in the silo and crushing equipment system.

[0040] Powder: Weigh high-purity fused magnesia, high-purity sintered magnesia, magnesia-aluminum spinel and sub-white corundum according to parts by weight and put them into the jaw crusher for crushing. After crushing into large particles, they are crushed by double rollers. Then vibrate and sieve to obtain particles with a particle size of 1-5mm, and then put them into a R...

Embodiment 2

[0053] The method of Example 1 was repeated at the contents of each component specified in Table 1 below, and the test results are listed in Table 3.

Embodiment 3

[0055] The method of Example 1 was repeated at the contents of each component specified in Table 1 below, and the test results are listed in Table 3.

technical field

[0001] The invention belongs to the technical field of high-grade refractory materials for electric furnaces, converter linings and ladle linings and their preparation, and in particular relates to a non-fired alumina-magnesia-carbon brick and a preparation method thereof. Background technique

[0002] Aluminum magnesia carbon brick is based on Al 2 o 3 , MgO and C as the main components of carbon-containing refractories, containing Al2O360% ~ 69%, MgO7% ~ 14%, C5% ~ 12%. It has good slag erosion resistance and thermal shock resistance, and has a small amount of reburning expansion. It is mainly used for electric furnace, converter lining and ladle lining. Although the existing alumina-magnesia-carbon bricks meet certain requirements for use, there are still problems such as high price and short service life. Therefore, how to reduce costs and develop green and environmentally friendly refractory materials with high efficiency and long service life has alw...

Examples

Embodiment 1

[0037] The raw materials were weighed according to the components specified in Table 1 below, and the preparation method was as follows.

[0038] (1) Raw material processing

[0039] Aggregate: Weigh brown corundum and or super-grade bauxite according to parts by weight, put them into a jaw crusher for crushing, and crush them into large particles, then crush them with rollers, and then use a vibrating screen to screen out the aggregates with a particle size of 0.1-5mm. When changing materials for crushing and crushing, first clean up the accumulated materials in the silo and crushing equipment system.

[0040] Powder: Weigh high-purity fused magnesia, high-purity sintered magnesia, magnesia-aluminum spinel and sub-white corundum according to parts by weight and put them into the jaw crusher for crushing. After crushing into large particles, they are crushed by double rollers. Then vibrate and sieve to obtain particles with a particle size of 1-5mm, and then put them into a R...

Embodiment 2

[0053] The method of Example 1 was repeated at the contents of each component specified in Table 1 below, and the test results are listed in Table 3.

Embodiment 3

[0055] The method of Example 1 was repeated at the contents of each component specified in Table 1 below, and the test results are listed in Table 3.

Images