Acid resistant castables are divided into heavy, semi-light, and light. Their main function is to be used for furnace linings that resist acid erosion. Acid-resistant refractory castables are generally combined with acid-resistant cement and are applicable to acid-resistant chimneys and liquid sulfur pool linings in the petrochemical industry.
1. Acid resistance is the same as other castables, but there are differences
Other refractory castables of this kind of castable are also similar and differentiated, and they belong to acidic media. During production, the raw materials are also processed into granules and fine powder in acidic medium, and a certain proportion of ultra-fine powder and additives are added. However, this kind of acid resistant castables cannot be used in atmospheres with large temperature differences, nor can it be used in construction in places that are too humid. If the temperature is not suitable, it will reduce the later use strength and acid resistance of the acid-resistant castable, and it will peel off.
For example, chimneys use acid-resistant castables. Generally, semi-light weight is used, which can not only provide thermal insulation but also resist erosion and acid gas erosion. Because semi-lightweight acid-resistant castables save energy. Improve the operation rate and service life of the chimney, and at the same time, the weight of the chimney body will not be too heavy.
2. Scope of application
Acid resistant refractory castables are all used in acid-resistant furnace linings and cannot be used in neutral or alkaline furnace lining atmospheres because the high-temperature resistance of this castable is not as good as the high-aluminum series castables used in neutral atmospheres. The use of acid resistant castables in alkaline atmosphere is not as good as that of the magnesium series. It is mainly used in chimneys, flues, linings of nitric acid shrinkage towers in acidic atmospheres, and linings of acidic gas containers. The high temperature resistance of acidic materials is not as good as that of high aluminum series and magnesium series.
However, acid-resistant castables can be used as separate lining materials. When used in a furnace with a consistent atmosphere, the castables' own acid-resistant effects will be exerted, and they cannot be used as furnace linings in other atmospheres. First, there is a gap in high temperature resistance, and then there is a gap in resistance to erosion by other atmospheres.
In other words, acid-resistant castables, whether heavy, semi-light, or light, can only be used as acid gas furnace linings.
