Sodium tripolyphosphate, an inorganic compound with the formula Na5P3O10, is an amorphous, water-soluble linear polyphosphate commonly used in food as a moisture-retaining agent, quality improver, pH regulator, and metal chelating agent. In refractory materials, it is generally used as a water-reducing agent (dispersant). A suitable amount of sodium tripolyphosphate not only enhances the material's strength and corrosion resistance but also optimizes thermal stability and refractoriness, thus extending the material's service life. The dosage of sodium tripolyphosphate is adjusted according to specific material formulations and performance requirements to achieve the best results.
Sodium hexametaphosphate is used in refractories primarily as a water-reducing agent (dispersant) and binder, particularly in magnesium-based refractory castables, non-fired bricks, and alkaline repair materials. Its application improves the physical properties, structural organization, and performance of these materials, enhancing compressive strength, slag resistance, impact resistance, and chemical stability. These properties make sodium hexametaphosphate an indispensable material in high-temperature industrial kilns and equipment.
Sodium pyrophosphate, an inorganic compound with the formula Na4P2O7, is a white crystalline powder that absorbs moisture from the air and dissolves in water. In refractory material preparation, it is used not only as a water-reducing and plasticizing agent but also as a setting agent (or hardening agent). It shortens the setting and hardening time of refractory castables after construction, which is significant for improving construction efficiency and quality.
Citric acid, with the molecular formula C6H8O7, is an organic compound used primarily in the food and beverage industries as a flavoring agent, preservative, and acidulant. It is also used in the chemical, cosmetics, and detergent industries as an antioxidant, plasticizer, and detergent. In refractory materials, citric acid mainly adjusts the pH to influence the hardening time of castables under different temperatures.
High-efficiency water reducers in refractory materials improve performance, reduce costs, and enhance construction characteristics. These chemical additives significantly reduce the amount of mixing water, playing a crucial role in refractory castables. They not only decrease the air voids in the castable body after casting but also enhance mechanical properties and corrosion resistance. By altering the flowability and viscosity of the castables, water reducers help reduce water usage and cement consumption, thus lowering overall costs. Additionally, they reduce shrinkage during hardening, minimizing cracks and defects, and improving ease of construction, leading to a more uniform structure and better quality.
Chromium oxide green, also known as chromium trioxide or chromium oxide, is a dark green crystalline powder with a metallic luster and belongs to the hexagonal or rhombohedral crystal system. Its chemical formula is Cr2O3, with a melting point of 2266°C. Chromium oxide green is widely used in refractory materials to enhance performance and service life. It is an important additive for manufacturing refractory bricks, castables, and refractory mortars.
Explosion-proof fibers are made from polypropylene through special processes. When mixed uniformly with other refractory materials and baked, these fibers start to soften, shrink, and melt at high temperatures, ultimately forming pores and carbonizing. They distribute within the construction material to create a micro-network of pores, which facilitates water and gas channels, reduces internal stress, prevents cracking, and enhances overall service life.
Carboxymethyl cellulose (CMC) is used in refractory materials primarily as a binder. CMC, a type of cellulose ether, has functions such as thickening, film-forming, bonding, moisture retention, colloid protection, emulsification, and suspension. These properties make CMC widely used in industries like petroleum, food, pharmaceuticals, textiles, and papermaking. In refractory materials, CMC acts as a binder, mixed with refractory aggregates and powders, forming materials that do not require firing and are directly baked, offering benefits like simplified processing, energy saving, low cost, and ease of mechanized construction.
In the vast field of materials science, heat-resistant stainless steel fiber, as a high-performance reinforcing material, is gradually demonstrating its excellent reinforcement effect in refractory castables. The introduction of this special fiber not only enhances the physical and mechanical properties of refractory castables but also expands its application range in extreme high-temperature environments, providing strong technical support for the safe and stable operation of industrial furnaces, steelmaking, petrochemical industries, and other fields. The reinforcement mechanism of steel fiber includes the formation of a three-dimensional network structure, thermal stress dispersion, crack bridging, and prevention. Its application effects enhance mechanical properties, optimize thermal performance, and extend service life.
Boric acid enhances the sintering process in refractory materials, especially in non-fired refractories such as ramming mixes and spray coatings. As a fluxing agent, it plays a key role in the production of refractory materials by promoting the sintering process, which helps in forming a denser structure at high temperatures, thereby improving mechanical strength and refractory performance.
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