Features of lightweight refractory bricks:
In the contemporary industry with increasingly tight mineral resources, eco-friendly refractory products have become the ideal products for thermal enterprises, and the use of lightweight refractory bricks is increasing day by day. The disadvantage of lightweight refractory bricks is poor thermal insulation performance, and the advantage is that they have good long-term high temperature resistance. In use, the weight of the kiln body can be reduced, thereby reducing energy consumption and improving the economic benefits of the enterprise.
The pores in the lightweight refractory bricks are made by adding light aggregates such as combustibles, foaming agents or hollow spheres, and the size of the pores is large. These pores not only have poor thermal insulation effect, but also affect the mechanical properties of the product. If the volume fraction of pores is increased, many pores will agglomerate together, which will affect the strength of the thermal insulation brick. However, lightweight insulating bricks have a lower specific surface area and lower specific surface energy. Therefore, the thermodynamic stability is better. After long-term heating, it is not easy to deteriorate.
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Application of lightweight refractory bricks：
The application range of light-weight refractory bricks made by the gas method is various and expanding. When applying this type of refractory brick, in addition to other properties of the refractory brick, it should be considered that the slag resistance of the product is very small.
Clay foam lightweight refractory bricks can be used in heat treatment furnaces and annealing furnaces without intense thermal shock at temperatures not higher than 1250°C (and chemically manufactured lightweight refractory bricks not higher than 1200°C) , Heating furnaces and other kilns, foamed hot material lightweight refractory bricks (with high clinker content) can be used in forging furnaces, heat treatment furnaces, heating furnaces and electric furnaces, with a working temperature of 1350 ° C; Clay lightweight refractory bricks can also be used in these above-mentioned kilns and used to build the wall masonry of the boiler combustion chamber, the temperature can reach 1400'C, and can withstand thermal shock. Super lightweight refractory bricks can only be used on protected insulation up to 1200°C
Regarding light silica brick, because of its high softening temperature under load, it can be used as a thermal insulation material for heating furnaces, coke ovens and glass kilns, as well as high-temperature kilns for ceramic firing.
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Methods of improving the compressive strength of lightweight refractory bricks:
Due to the production process and other reasons, the products produced by lightweight refractory bricks are often much worse in strength than high alumina bricks or clay bricks. Generally, some processes are required to improve their compressive strength. The method for improving the mechanical properties of lightweight refractory bricks is specifically: dipping the lightweight refractory bricks in an organosilicon solution, and the dipping time is 2 to 5 hours; taking out the lightweight refractory bricks and putting them into an oven to solidify to obtain a mixture of organosilicon and refractory bricks. Composite brick body, curing temperature is 200-250 ℃, and curing time is 2～5 hours; Put described composite brick body again in atmosphere furnace thermal cracking, thermal cracking temperature is 800～1300 ℃, and thermal cracking time is 1 ~3 hours, then cooled to room temperature to obtain the modified light refractory brick; the whole thermal cracking and cooling process is carried out under the protection of reducing atmosphere or inert atmosphere. Compared with the prior art, the present invention mainly has the following remarkable effects: in the modification process, the porosity and refractoriness of the lightweight refractory bricks are hardly changed, but the compressive strength can be increased by 50-150%. And it has the advantages of simple process, easy adjustment and control, good repeatability and low cost.
Zhengzhou Shennan Refractory Co.,Ltd are professional in producing different kinds of the lightweight refractory bricks , any demands ,please don't hesitate contact with us.
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+86-15238007351 |
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+86-371-86036378 |
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