What is Alkali-resistant Refractory Castable?

2023-08-21 12:00:44

Alkali-resistant refractory castable is a kind of refractory castable that can resist the erosion of metal oxides. It is mainly composed of refractory aggregate, binder aggregate, binder, and alkali-resistant agent. If it is divided by porosity If it is more than 45%, it is a light alkali-resistant refractory castable, and less than 45% is a heavy alkali-resistant refractory castable.

Alkali-resistant refractory castable features:

1. Good high-temperature performance;

2. Strong alkali resistance and corrosion resistance;

3. Can resist the erosion of sodium salt melt;

Alkali-resistant refractory castable scope of application:

Alkali-resistant refractory castables are mainly used in industrial furnaces with alkali corrosion in industries such as iron and steel, nonferrous metals, glass, machinery, and petrochemical industries. Among them, heavy alkali-resistant refractory castables are mainly used in the kiln tail, kiln head, preheater, discharge port, tuyere, and other parts of the calcined alumina rotary kiln and cement rotary kiln. Lightweight alkali-resistant refractory castables are mainly used for the top cover of the preheater, cylinder body, and thermal insulation lining of the above-mentioned rotary kiln.

The main components of refractory castables:

1. The chemical composition of light alkali-resistant refractory castables is generally: Al2O3 content of 30% to 55% and SiO2 content of 25% to 45%.

2. The aggregates used in heavy alkali-resistant refractory castables include bauxite clinker, clay clinker, etc., and the binder and alkali-resistant powder are the same as light alkali-resistant castables. Its main chemical composition is Al2O3 content of 35% to 60%; SiO2 content of 35% to 60%.

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