High-abrasion high-alumina brick with heat shock resistance and manufacturing method thereof

Abstract

The invention discloses a high-abrasion high-alumina brick with heat shock resistance. The high-abrasion high-alumina brick comprises the following components in parts by weight: 5-15 parts of 3-5mm super alum aggregate, 30-40 parts of 1-3mm super alum aggregate, 10-20 parts of 0-1mm super alum aggregate, 20-30 parts of super alum powder, 5-7 parts of zirconium carbide fine powder, 2 parts of chromium carbide powder, 1-3 parts of Suzhou mud NO.2, 8-10 parts of compound binder and 4-6 parts of water. The invention also discloses a manufacturing method of the high-abrasion high-alumina brick with heat shock resistance. The high-abrasion high-alumina brick with heat shock resistance disclosed by the invention has high strength, refractoriness, high abrasion and heat shock resistance, and is applicable to a circulating fluid bed boiler cyclone separator flue, cyclone separator straight section and cone body, a return feeder, a metallurgical furnace and other thermal equipment. The high-abrasion high-alumina brick is simple in manufacturing process and easy to realize.

Description

technical field

[0001] The invention belongs to the field of refractory materials, and in particular relates to a high-alumina brick with high wear resistance and thermal shock resistance and a manufacturing method thereof. Background technique

[0002] In the circulating fluidized bed boiler, the cyclone separator is one of the most critical parts of the fluidized bed boiler, and the refractory materials used in these parts must have good wear resistance and thermal shock stability. The most commonly used refractory materials in these parts are PA bricks or high alumina castables. The inlet flue of the cyclone separator, the straight section and the cone section of the separator have high flow velocity, high ash concentration, and severe wear, especially within the range of tangential angle of 120° at the flue gas inlet, due to the erosion of high-speed gas-solid two-phase flow, Resulting in severe wear and tear on this part. Contents of the invention

[0003] The prese...

Examples

Embodiment 1

[0029] Mix 15 parts of 3~5mm super bauxite aggregate, 30 parts of 1~3mm super bauxite aggregate, 20 parts of 0~1mm super bauxite aggregate, 28 parts of 220 mesh super bauxite fine powder, 5 parts of 320 Purpose Zirconium carbide fine powder, 2 parts of chromium carbide fine powder, 2 parts of Suzhou No. 2 mud, 9 parts of composite binder, and 4 parts of water are mixed and pressed on a 3150KN friction brick press, and the bulk density of the semi-finished product is 2.92~3.07g.cm -3 . After baking at 90°C for 24 hours, the residual moisture of the green body is ≤2%. Firing can be fired by pusher kiln or tunnel kiln, and fired at 1500°C to 1550°C for 4 hours to obtain the desired finished high-abrasion-resistant and thermal-shock-resistant high-alumina brick.

Embodiment 2

[0031] Mix 10 parts of 3~5mm super bauxite aggregate, 38 parts of 1~3mm super bauxite aggregate, 15 parts of 0~1mm super bauxite aggregate, 30 parts of 220 mesh super bauxite fine powder, 6 parts of 320 Purpose Zirconium carbide fine powder, 2 parts of chromium carbide fine powder, 1 part of Suzhou No. 2 mud, 8 parts of composite binder, 5 parts of water are mixed and pressed on a 3150KN friction brick press, and the bulk density of the semi-finished product is 2.9~3.05g.cm -3 . After baking at 80°C for 36 hours, the residual moisture of the green body is ≤2%. Firing can be fired in pusher kiln or tunnel kiln, and fired at 1500°C to 1550°C for 3 hours to obtain the desired finished high-alumina brick with high wear resistance and thermal shock resistance.

Embodiment 3

[0033] 5 parts of 3-5mm super-grade bauxite aggregate, 40 parts of 1-3mm super-grade high-alumina bauxite aggregate, 20 parts of 0-1mm super-grade bauxite aggregate, 25 parts of 220-mesh super-grade bauxite fine powder, 7 Parts of 320 mesh zirconium carbide fine powder, 2 parts of chromium carbide fine powder, 3 parts of Suzhou No. 2 mud, 10 parts of composite binder, 6 parts of water are mixed and pressed on a 3150KN friction brick press, and the bulk density of the semi-finished product is 2.85~3.02g .cm -3 . After baking at 60°C for 48 hours, the residual moisture of the green body is ≤2%. Firing can be fired by pusher kiln or tunnel kiln, and fired at 1500°C to 1550°C for 3.5 hours to obtain the desired finished high-abrasion-resistant and thermal-shock-resistant high-alumina brick.

technical field

[0001] The invention belongs to the field of refractory materials, and in particular relates to a high-alumina brick with high wear resistance and thermal shock resistance and a manufacturing method thereof. Background technique

[0002] In the circulating fluidized bed boiler, the cyclone separator is one of the most critical parts of the fluidized bed boiler, and the refractory materials used in these parts must have good wear resistance and thermal shock stability. The most commonly used refractory materials in these parts are PA bricks or high alumina castables. The inlet flue of the cyclone separator, the straight section and the cone section of the separator have high flow velocity, high ash concentration, and severe wear, especially within the range of tangential angle of 120° at the flue gas inlet, due to the erosion of high-speed gas-solid two-phase flow, Resulting in severe wear and tear on this part. Contents of the invention

[0003] The prese...

Examples

Embodiment 1

[0029] Mix 15 parts of 3~5mm super bauxite aggregate, 30 parts of 1~3mm super bauxite aggregate, 20 parts of 0~1mm super bauxite aggregate, 28 parts of 220 mesh super bauxite fine powder, 5 parts of 320 Purpose Zirconium carbide fine powder, 2 parts of chromium carbide fine powder, 2 parts of Suzhou No. 2 mud, 9 parts of composite binder, and 4 parts of water are mixed and pressed on a 3150KN friction brick press, and the bulk density of the semi-finished product is 2.92~3.07g.cm -3 . After baking at 90°C for 24 hours, the residual moisture of the green body is ≤2%. Firing can be fired by pusher kiln or tunnel kiln, and fired at 1500°C to 1550°C for 4 hours to obtain the desired finished high-abrasion-resistant and thermal-shock-resistant high-alumina brick.

Embodiment 2

[0031] Mix 10 parts of 3~5mm super bauxite aggregate, 38 parts of 1~3mm super bauxite aggregate, 15 parts of 0~1mm super bauxite aggregate, 30 parts of 220 mesh super bauxite fine powder, 6 parts of 320 Purpose Zirconium carbide fine powder, 2 parts of chromium carbide fine powder, 1 part of Suzhou No. 2 mud, 8 parts of composite binder, 5 parts of water are mixed and pressed on a 3150KN friction brick press, and the bulk density of the semi-finished product is 2.9~3.05g.cm -3 . After baking at 80°C for 36 hours, the residual moisture of the green body is ≤2%. Firing can be fired in pusher kiln or tunnel kiln, and fired at 1500°C to 1550°C for 3 hours to obtain the desired finished high-alumina brick with high wear resistance and thermal shock resistance.

Embodiment 3

[0033] 5 parts of 3-5mm super-grade bauxite aggregate, 40 parts of 1-3mm super-grade high-alumina bauxite aggregate, 20 parts of 0-1mm super-grade bauxite aggregate, 25 parts of 220-mesh super-grade bauxite fine powder, 7 Parts of 320 mesh zirconium carbide fine powder, 2 parts of chromium carbide fine powder, 3 parts of Suzhou No. 2 mud, 10 parts of composite binder, 6 parts of water are mixed and pressed on a 3150KN friction brick press, and the bulk density of the semi-finished product is 2.85~3.02g .cm -3 . After baking at 60°C for 48 hours, the residual moisture of the green body is ≤2%. Firing can be fired by pusher kiln or tunnel kiln, and fired at 1500°C to 1550°C for 3.5 hours to obtain the desired finished high-abrasion-resistant and thermal-shock-resistant high-alumina brick.