Alkali-resistant refractory castables are a kind of refractory material with special properties. The following is a detailed introduction to them:
1. Definition and composition
Alkali-resistant refractory castables are a kind of refractory castables that can resist the corrosion of metal oxides. They are mainly composed of refractory aggregates, binders, additives (such as alkali-resistant agents, microsilica powder, waterproofing agents, plasticizers, etc.) and necessary water or other solvents. These components are precisely proportioned and mixed to form a high-performance composite material.
2. Classification
According to the different porosity, alkali-resistant refractory castables can be divided into light and heavy types:
Light alkali-resistant refractory castables: porosity greater than 45%, mainly used in parts that need to reduce weight, such as the preheater top cover, cylinder and thermal insulation lining of the rotary kiln.
Heavy alkali-resistant refractory castable: The porosity is less than 45%, and it is mainly used in parts that withstand higher pressure and temperature, such as the kiln tail, kiln head, preheater, discharge port, tuyere and other parts of the roasting alumina rotary kiln and cement rotary kiln.
3. Features and performance
High alkali resistance: Alkali-resistant refractory castable can resist the erosion of high concentrations of alkaline substances and protect the long-term stable operation of equipment.
Good construction performance: It has excellent fluidity and plasticity, is easy to construct and shape, and can be constructed by on-site vibration casting, spraying and other methods.
High strength: After hardening, it has high compressive strength and flexural strength, and can withstand greater external forces.
Excellent thermal shock resistance: It is not easy to crack and peel off under the alternating action of high and low temperatures, and has good thermal stability.
4. Application fields
Alkali-resistant refractory castables are widely used in many fields due to their excellent performance:
Chemical production: used to protect equipment and pipelines that come into contact with alkaline substances from erosion.
Metallurgical industry: used in furnaces, flues and other parts that come into contact with alkaline substances to increase the service life of equipment.
Power industry: used in flue gas desulfurization devices and flue gas purification devices to protect equipment from erosion by alkaline substances.
V. Production process and quality control
The production process of alkali-resistant refractory castables mainly includes steps such as raw material preparation, batching, mixing, molding and curing. During the production process, it is necessary to strictly control the quality and batching ratio of raw materials to ensure that the alkali-resistant refractory castables produced have stable performance and quality. At the same time, the finished products are quality inspected, including appearance inspection, dimension measurement, strength testing, etc., to ensure that they meet the design requirements.
VI. Development trend
With the continuous development of industrial production and the continuous advancement of technology, alkali-resistant refractory castables are also constantly improving and optimizing. Future development trends include:
Environmental protection: focus on environmental protection performance and reduce the impact on the environment.
High performance: continuously improve its alkali resistance, strength, thermal shock resistance and other properties to meet more demanding industrial production needs.
Intelligent production: realize automated and intelligent production, improve production efficiency and product quality.
Alkali-resistant refractory castable is a high-performance refractory material with broad application prospects. By optimizing its composition, production process and quality control, its performance and quality can be continuously improved to meet the needs of industrial production.
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