High-strength flue cover board brick and preparation method thereof

Abstract

The invention particularly relates to a high-strength flue cover board brick and a preparation method thereof. The technical scheme comprises steps as follows: 50wt%-80wt% of bauxite, 5wt%-20wt% of clay, 5wt%-20wt% of mullite and 5wt%-15wt% of one of kyanite, andalusite and sillimanite are taken as raw materials, a sintering aid accounting for 0.1wt%-1wt% of the raw materials, a plasticizer accounting for 0.1wt%-5wt% of the raw materials and a binding agent accounting for 1wt%-10wt% of the raw materials are added, all components are mixed uniformly, aged for 12 h and subjected to extrusion molding, and a green body of the flue cover board brick is prepared accordingly; the green body of the flue cover board brick is dried for 24 h at the temperature of 110 DEG C and sintered for 3-7 h at the temperature of 1,100-1,500 DEG C, and the high-strength flue cover board brick is prepared. The high-strength flue cover board brick and the preparation method thereof have the characteristics as follows: the process is simple, controllability is high, and the prepared high-strength flue cover board brick is high in strength, good in thermal insulation effect, high in acidic and alkaline gas scouring resistance and good in thermal shock resistance stability.

Description

technical field [0001] The invention belongs to the technical field of flue. Specifically relates to a high-strength flue cover brick and a preparation method thereof. Background technique [0002] The flue cover brick is applied to the top of the flue and is a vital part of the flue gas delivery pipeline. Its main function is: on the one hand, it acts as a seal to prevent the exhaust gas from leaking out and causing environmental pollution; on the other hand, it acts as a heat insulation to avoid heat loss in industrial kilns. Due to the design of the flue size, the size of the flue cover brick is relatively large, which has high requirements on the strength of the material, so the preparation process is limited. At present, there are two main types of preparation processes for flue cover bricks: [0003] One is heavy bricks prepared by machine pressing, such as the patented technology of "an environmentally friendly anti-stripping high-alumina brick and its preparation ...

AI Technical Summary

Problems solved by technology

Although the products prepared by the above technologies have their own advantages, they all have the disadvantages of high bulk density and poor heat insulation performance, and the use of flue cover plates will cause a large amount of heat energy loss

[0004] The second is a prefabricated part prepared by pouring molding, such as the patented technology of "a preparation method of a high-alumina castable that is not wetted by aluminum liquid" (CN101717246A). Silica micropowder, alumina micropowder, and pure calcium aluminate cement are used as the main raw materials to prepare high-alumina castables. However, this technical solution adopts the method of pouring molding. It is difficult to ensure that the structure of the entire prefabricated part is very uniform during the molding process. Delamination is easy to occur in the process of medium air bubbles, resulting in uneven structure of the product