Overview
Refractory gunning mix is a pre-blended, dry formulation designed for pneumatic application to repair or line high-temperature industrial equipment. Unlike traditional castables, it requires no formwork and achieves 80–90% first-pass adhesion, making it ideal for emergency repairs in steel mills, cement plants, and incinerators. Developed in the mid-20th century, modern mixes incorporate advanced binders like calcium aluminate or colloidal silica to reduce curing time. Some formulations include stainless steel fibers (3–6% by weight) to enhance crack resistance in cyclic heating applications.
Physical and Chemical Properties
The material typically contains 40–70% alumina (Al₂O₃) as the primary refractory component, with silica (SiO₂) and magnesia (MgO) adjusting the acid/base resistance. Binder systems determine the setting characteristics—low-cement mixes (<5% CaO) offer better high-temperature stability but slower initial strength development. Key performance metrics include cold crushing strength (15–50 MPa after drying), permanent linear change (<1.5% at service temperature), and thermal conductivity (0.8–1.5 W/m·K). Particle size distribution is critical, with 70% of grains between 1–5 mm to ensure pumpability and minimal rebound during gunning.
Main Applications
In steelmaking, gunning mixes repair torpedo ladle linings between heats, with service temperatures up to 1,650°C. Cement rotary kilns use magnesia-based mixes for coating the transition zone, while glass tank regenerators require low-iron formulations to prevent contamination. The power generation sector employs these materials for CFB boiler refractory maintenance, where rapid application minimizes downtime. Specialized mixes with zirconia additives (15–25%) are used in waste-to-energy plants to resist slag corrosion from municipal waste combustion.
Safety and Storage
Dry powder poses inhalation risks; NIOSH-approved P2 respirators are mandatory during mixing. The cured material is inert, but cutting or grinding generates respirable crystalline silica—local exhaust ventilation is required. Storage requires protection from moisture absorption, which can prematurely activate hydraulic binders. Bulk bags should be stacked no more than three high and used within 12 months. Opened bags must be resealed with desiccant packs in humid climates (>60% RH).
B2B Procurement Guide
Industrial buyers should evaluate: (1) Application method (wet/dry gunning equipment compatibility), (2) Required thickness (standard mixes cover 50–150 mm per pass), and (3) Curing profile (some formulations need 24-hour dry-out at 110°C before heating). For large-volume contracts (50+ tons), consider on-site silo storage with pneumatic delivery systems. Sample testing should verify rebound rate (<15% for efficient application) and adhesion strength (>0.5 MPa after 1 hour). Leading manufacturers include Calderys, RHI Magnesita, and Vesuvius, with regional suppliers offering cost-competitive alternatives.
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