Ultra low cement refractory castable

Ultra low cement refractory castable

Ultra-low cement refractory castable is an important refractory material.

1.Definition and characteristics

Ultra-low cement refractory castable refers to refractory castable with significantly reduced calcium aluminate cement addition, and its CaO content is usually specified to be less than 1%. This material reduces the amount of cement and introduces additives such as ultrafine powder to improve refractoriness, high temperature strength, slag resistance, and reduce porosity. Its main features include:

High refractoriness and high temperature strength: Due to the reduction in cement addition, the amount of low eutectic phase in ultra-low cement refractory castables is greatly reduced, thereby improving refractoriness and high temperature strength.

Excellent slag resistance: Ultra-low cement refractory castables have good resistance to corrosive substances and show good wear resistance.

Low porosity and high bulk density: The reduction in construction water consumption makes the porosity low and the bulk density high, further improving the performance of the material.

Good construction performance: It can be made into self-flowing or vibrating castables as needed to meet the construction needs of different structures.

2.Composition and preparation

Ultra-low cement refractory castables are mainly composed of refractory aggregate, refractory powder, appropriate amount of ultrafine powder, a small amount of calcium aluminate cement (as a delayed-acting accelerator) and a trace amount of dispersant. During the preparation process, the proportion of each component must be strictly controlled and fully mixed to ensure the uniformity and stability of the material. In addition, in order to further improve the performance of the material, an appropriate amount of water reducer and delayed-acting accelerator are sometimes added.

3.Application Scope

Ultra-low cement refractory castables are widely used as lining materials in industrial kilns in industries such as metallurgy, petrochemicals, machinery manufacturing, electric power and building materials. Specific application areas include linings of heating furnaces, various heat treatment furnaces, electric furnace covers, vertical kilns, rotary kilns, blast furnace tapping channels, steel ladles and iron ladles, as well as linings of high-temperature refractory components with metal anchors.

4.Performance advantages

Long service life: Ultra-low cement refractory castables have high refractoriness and high temperature strength, which can significantly increase the service life of the kiln.

Energy saving and consumption reduction: Due to its excellent thermal insulation performance, it can effectively reduce energy consumption and improve the thermal efficiency of industrial equipment.

Easy construction: It has good construction performance and can be cut and spliced ​​as needed, and the construction is simple and fast.

Significant economic benefits: Although the initial investment of ultra-low cement refractory castables may be high, due to its long service life, energy saving and consumption reduction and other advantages, it has significant economic benefits in the long run.

5.Precautions

Construction preparation: Ultra-low cement refractory castables must adopt a pre-mixing process to ensure that various additives are evenly mixed to avoid unstable performance.

Baking system: Baking is a key link in the use of ultra-low cement refractory castables. Baking must be carried out strictly in accordance with the baking system to ensure that the material has high-temperature performance.

Maintenance and management: During use, the kiln must be inspected and maintained regularly to detect and deal with potential problems in a timely manner to extend the service life of the kiln.

In summary, ultra-low cement refractory castables occupy an important position in the field of refractory materials due to their excellent performance and broad application prospects.