Novel low-heat-conduction high-wear-resistance silicon-mullite composite heat-insulation special brick

Abstract

The invention relates to a novel low-heat-conductivity high-wear-resistance silicon-mullite composite heat-insulation special brick which is of a working layer and heat-insulation layer composite structure, and the working layer and the heat-insulation layer are connected through high-temperature cement gum. The working layer is prepared from the following components: 15 to 25 weight percent of bauxite, 25 to 40 weight percent of silicon carbide, 10 to 15 weight percent of mullite, 15 to 20 weight percent of andalusite, 15 to 20 weight percent of antioxidant and 5 to 10 weight percent of corundum; the heat insulation layer comprises the following components: 90 to 95 weight percent of aluminum silicate and 5 to 10 weight percent of corundum. The novel low-heat-conductivity high-wear-resistance silicon-mullite composite heat-insulation special brick has the advantages of high use temperature, high wear resistance, high erosion resistance, high stripping resistance, good thermal shock stability, low heat conductivity coefficient and good heat insulation effect, the bonding surface of the working layer and the heat insulation layer is firm and crack-free, the temperature of the outer wall of a cylinder can be reduced, and the service life of the cylinder is prolonged. Meanwhile, energy is saved, consumption is reduced, and the service life of the rotary kiln can be greatly prolonged; the material is an ideal material for the rear section of a combustion zone, a cooling zone and other parts of a novel dry-process cement kiln.

Description

Technical Field

[0001] The invention belongs to the technical field of refractory bricks, and in particular relates to a novel low-thermal-conductivity and high-wear-resistant silicon-molybdenum composite heat-insulating special brick. Background Art

[0002] The low thermal conductivity and high wear-resistant silicon-molybdenum composite insulation special brick is a new type of refractory brick for cement kiln, which consists of a working layer and an insulation layer. The working layer uses high-quality bauxite and silicon carbide as the main raw materials, and the insulation layer uses aluminum silicate material with low thermal conductivity. It is made by high-pressure molding and special technology, and the bonding tooth surfaces between the two parts are staggered to form a composite brick as a whole. The product has the characteristics of good wear resistance and low thermal conductivity.

[0003] However, in the production process of low thermal conductivity and high wear resistance silica-molybdenum composite insulation special bricks, due to the difference in materials between the working layer and the insulation layer, high requirements are placed on the selection of raw materials, resulting in poor thermal shock stability and short service life of the composite silica-molybdenum bricks. Summary of the invention

[0004] In order to improve the thermal shock stability of existing silica-molybdenum bricks and extend their service life, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a new type of low thermal conductivity and high wear resistance silica-molybdenum composite insulation special brick.

[0005] This new type of low thermal conductivity and high wear resistance silicon-molybdenum composite insulation special brick is a composite structure of a working layer and an insulation layer, and the working layer and the insulation layer are connected by high-temperature mortar; the working layer includes the following components: 15-25wt% bauxite, 25-40wt% silicon carbide, 10-15wt% mullite, 15-20wt% andalusite, 15-20wt% antioxidant and 5-10wt% corundum; the insulation layer includes the following components: 90-95wt% aluminum silicate and 5-10wt% corundum.

[0006] Preferably, the working layer comprises the following components: 25wt% bauxite, 35wt% silicon carbide, 10wt% mullite, 10wt% andalusite, 15wt% antioxidant and 5wt% corundum; the thermal insulation layer comprises the following components: 95wt% aluminum silicate and 5wt% corundum.

[0007] The beneficial effects of the present invention are as follows: the new low thermal conductivity and high wear-resistant silicon-molybdenum composite insulation special brick of the present invention has the advantages of high operating temperature, strong wear resistance, high erosion resistance, strong anti-stripping performance, good thermal shock stability, low thermal conductivity and good insulation effect. The bonding surface between the working layer and the insulation layer is firm and crack-free, which can reduce the temperature of the outer wall of the cylinder, while saving energy and reducing consumption, and can greatly extend the life of the rotary kiln; it is an ideal material for the rear section of the combustion zone, cooling zone and other parts of the new dry cement kiln. DETAILED DESCRIPTION

[0008] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0009] Example 1

[0010] A new type of low thermal conductivity and high wear-resistant silicon-molybdenum composite insulation special brick has a composite structure of a working layer and an insulation layer, and the working layer and the insulation layer are connected by high-temperature cement; the working layer comprises the following components: 25wt% of bauxite, 35wt% of silicon carbide, 10wt% of mullite, 10wt% of andalusite, 15wt% of antioxidant and 5wt% of corundum; the insulation layer comprises the following components: 95wt% of aluminum silicate and 5wt% of corundum.

[0011] Example 2

[0012] A new type of low thermal conductivity and high wear-resistant silicon-molybdenum composite insulation special brick has a composite structure of a working layer and an insulation layer, and the working layer and the insulation layer are connected by high-temperature cement; the working layer comprises the following components: 15wt% of bauxite, 25wt% of silicon carbide, 15wt% of mullite, 20wt% of andalusite, 15wt% of antioxidant and 10wt% of corundum; the insulation layer comprises the following components: 90wt% of aluminum silicate and 10wt% of corundum.

Claims

1. A new type of low thermal conductivity and high wear resistance silicon-molybdenum composite insulation special brick, characterized by: The invention is a composite structure of a working layer and a heat-insulating layer, and the working layer and the heat-insulating layer are connected by high-temperature cement; the working layer comprises the following components: 15-25wt% of bauxite, 25-40wt% of silicon carbide, 10-15wt% of mullite, 15-20wt% of andalusite, 15-20wt% of antioxidant and 5-10wt% of corundum; the heat-insulating layer comprises the following components: 90-95wt% of aluminum silicate and 5-10wt% of corundum.

2. According to claim 1, the new low thermal conductivity and high wear resistance silicon-molybdenum composite insulation special brick is characterized in that: The working layer includes the following components: 25wt% of bauxite, 35wt% of silicon carbide, 10wt% of mullite, 10wt% of andalusite, 15wt% of antioxidant and 5wt% of corundum; the thermal insulation layer includes the following components: 95wt% of aluminum silicate and 5wt% of corundum.