Description

Refractory castable Description

Refractory castables are a type of refractory material used in high temperature environments. They are made by mixing refractory aggregates, powders, binders and additives, casting and curing to form a solid lining. They have excellent high temperature performance and can withstand extreme high temperature conditions. The refractoriness is usually between 1580℃ and 1850℃. The construction flexibility of refractory castables makes them popular in the industry and suitable for furnaces, pipes and reactor linings of various complex shapes. They not only provide thermal insulation and refractory properties, but also resist slag, chemical erosion and mechanical wear, extending the service life of equipment.

During the application process, refractory castables can be customized according to different industrial needs. For example, in environments where slag resistance is required at high temperatures, high-aluminum castables or magnesium castables are widely used; while in occasions where wear resistance is required, such as circulating fluidized bed boilers, silicon carbide castables become the first choice. The construction process of refractory castables is relatively simple. They are formed by pouring, vibrating or pressing, and can be used after a certain curing time, which not only improves construction efficiency but also reduces equipment downtime. Their use not only improves the durability and safety of industrial equipment, but also provides higher efficiency and economic benefits for industrial production.

Other amorphous products

Castable refractory formula

Aggregate: such as high-alumina bauxite, silica, magnesia, etc.
Powder: such as alumina powder, silica powder, etc.
Binder: such as cement (high-alumina cement, silicate cement), phosphate, sodium silicate, etc.
Additives: including water reducer, early strength agent, expansion agent, etc., used to improve the performance of the material.

Technical Parameter

type	Refractoriness（℃）	Bulk density（g/cm³）	Compressive strength（MPa）	Line change rate（%）	Operating temperature（℃）	Slag resistance	Thermal shock stability
High alumina castable	1770 – 1850	2.6 – 2.9	30 – 80	±0.1 – ±1.5	1350 – 1600	better	generally
Clay castable	1580 – 1700	2.3 – 2.5	10 – 30	±0.1 – ±1.0	1100 – 1400	generally	Poor
Silicon castable	1690 – 1730	1.8 – 2.2	10 – 30	±0.5 – ±1.5	1400 – 1600	Poor	Poor
Magnesium castable	1750 – 1850	2.8 – 3.2	30 – 100	±0.1 – ±1.5	1600 – 1800	excellent	generally
Silicon carbide castable	1700 – 1800	2.2 – 2.6	30 – 60	±0.1 – ±0.5	1400 – 1600	excellent	excellent
Low cement castable	1700 – 1850	2.5 – 2.8	40 – 90	±0.1 – ±1.0	1400 – 1700	excellent	excellent
Cement-free castable	1750 – 1900	2.5 – 3.0	50 – 120	±0.1 – ±0.5	1500 – 1800	excellent	excellent