High-alumina brick and manufacturing method thereof

Abstract

The invention discloses a high-alumina brick. The high-alumina brick comprises, by weight, 5-15 parts of 3 mm-5 mm super alumina aggregate, 30-40 parts of 1 mm-3 mm super alumina aggregate, 10-20 parts of 0 mm-1 mm super alumina aggregate, 20-30 parts of super alumina powder, 5-7 parts of zirconium carbide powder, 1-3 parts of Guangxi mud, 8-10 parts of composite bonding agents and 4-6 parts of water. The invention further discloses a manufacturing method of the high-alumina brick. The high-alumina brick is of high strength, high refractoriness, high abrasion resistance and high thermal shock resistance and is applicable to a cyclone separator flue, a cyclone separator straight segment and a cone of a circulating fluidized bed boiler, a back-feeder, a metallurgical industrial furnace and other thermal equipment. The manufacturing process of the high-alumina brick is simple and easy to implement.

Description

technical field

[0001] The invention belongs to the field of refractory materials, in particular to a high alumina brick 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 present invention is precisely to overcome the above-mentioned shortcomi...

Examples

Embodiment 1

[0028] 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 Guangxi 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 ~ 1550 ° C for 4 hours to obtain the required finished high alumina brick.

Embodiment 2

[0030] 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, 1 part of Guangxi 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℃~1550℃ for 3 hours to get the required finished high alumina brick.

Embodiment 3

[0032] 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, 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 in pusher kiln or tunnel kiln, and fired at 1500℃~1550℃ for 3.5 hours to get the required finished high alumina brick.

technical field

[0001] The invention belongs to the field of refractory materials, in particular to a high alumina brick 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 present invention is precisely to overcome the above-mentioned shortcomi...

Examples

Embodiment 1

[0028] 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 Guangxi 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 ~ 1550 ° C for 4 hours to obtain the required finished high alumina brick.

Embodiment 2

[0030] 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, 1 part of Guangxi 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℃~1550℃ for 3 hours to get the required finished high alumina brick.

Embodiment 3

[0032] 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, 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 in pusher kiln or tunnel kiln, and fired at 1500℃~1550℃ for 3.5 hours to get the required finished high alumina brick.