A high blowing rate ventilation brick and its manufacturing method

Abstract

The invention relates to an air brick with a high blowing through rate and a manufacturing method thereof. The air brick is composed of the following components: coarse corundum with granularity greater than 0.5mm and smaller than or equal to 1 mm and mass fraction of 35-50%; fine corundum with granularity greater than 0 and smaller than or equal to 0.5 mm and mass fraction of 25-40%; alumina fine powder with granularity greater than 0.020 mm and smaller than or equal to 0.044 mm and mass fraction of 8-15%; alumina micro powder with granularity greater than 0 and smaller than or equal to 0.020 mm and mass fraction of 5-10%. The manufacturing method comprises the procedures of mixed milling, material kneading and press forming, and further comprises the procedures of roasting, high temperature sintering, flow detecting, steel shell packaging and the like. According to the air brick provided by the invention, the particle size distribution and the machine pressing pressure are controlled, and uniformly distributed and mutually communicated micropores are formed in a brick body after high temperature sintering so as to achieve the permeability of an air brick body material.

Description

technical field [0001] The invention relates to a ventilating brick for metallurgical refining, in particular to a ventilating brick with a high blowing rate and a manufacturing method thereof, belonging to the field of refractory materials. Background technique [0002] With the development of industrial technology, social demand puts forward higher requirements on steel quality and quality, forcing steel companies to continuously upgrade smelting technology. Therefore, the refining ratio and difficulty of steel smelting are constantly increasing, which affects the stability and smoothness of the smelting process. Higher requirements have also been raised. Moreover, since 2008, iron and steel enterprises have entered the era of meager profits as a whole. In 2011, the profit margin was only 2.4%. This efficiency enhancement project has put a heavy pressure on the price of refractory materials. In this context, customers put forward higher requirements for functional refrac...

AI Technical Summary

Problems solved by technology

However, the micropore forming agent is often difficult to distribute evenly, which makes it difficult to disperse the micropores evenly; on the other hand, the formed micropores have a low connectivity rate and are closed to each other, making it difficult to achieve a practical level of air permeability

If too much micropore forming agent is added, although the ventilation effect will be improved to a certain extent, the material strength will also be significantly reduced at the same time, and it is difficult to meet the use requirements of ventilation brick products.

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