Introduction of Alkali-resistant Refractory Castables

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.

Characteristics of alkali-resistant refractory castables

1. Good high-temperature performance;

2. Strong alkali resistance and corrosion resistance;

3. Can resist the erosion of sodium salt melt;

Applicable scope of alkali-resistant refractory castable

Alkali proof 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 castable Zhu Yong is used for the top cover of the preheater, the cylinder, and the thermal insulation lining in the kiln 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%.