1.The effect of the amount of binder added on the performance of refractory spray coatings. Within a certain range, increasing the amount of bauxite cement can improve the strength of refractory materials. However, when the amount of cement reaches a certain value, the strength increase is no longer obvious. Moreover, as the amount of cement added increases, its setting time will accelerate sharply, affecting the repair performance of the material after gunning.
2.The influence of the amount of additives added. As the amount of water-reducing agent added increases, the amount of water required for refractory spray coatings has a gradually decreasing trend. However, while reducing the amount of water added, the water-reducing agent will also affect the construction performance of the material.
3.Influence of particle size and distribution. The construction and use performance of gunning materials are closely related to their particle gradation. The ideal particle range is 3-0mm fine. Granular materials can improve the plasticity of the gunned layer, but also increase the possibility of peeling when drying. Coarse particles can make the gunning layer more stable, but at the same time increase the possibility of rebound.
4.The influence of raw materials. The durability of refractory spray paint is closely related to the selection of its main raw materials. Appropriate raw materials need to be selected according to different use environments.
5.The influence of binding agents. The bonding agent should have good physical binding ability and coagulation ability, so that the particles of the gunning material and the surface to be gunned can be well combined. At the same time, the addition of binder should not significantly reduce the corrosion resistance of the gunning material.
6.The impact of additives. In order to further improve the performance of the gunning material, appropriate additives, such as plasticizers, anti-explosion agents, expansion agents, etc., will be added to the gunning material. Plasticizers can improve the strength of gunning materials, but their addition amount needs to be strictly controlled. In addition, adding explosion-proof fiber to the gunning material can prevent the gunning material from exploding during the heating process. Adding an expansion agent can cause the gunning material to expand at high temperatures and offset the shrinkage that occurs during high-temperature sintering.
7.The influence of other factors. The construction performance and usability of supplementary materials are also closely related to the operating level of construction personnel, the quality of construction equipment, and the selection of process parameters. For example, using a straight nozzle will cause the separation of coarse particles and fine particles, affecting the spraying effect. Using a nozzle with a smaller diameter can reduce the hydration zone and maintain good performance of the gunning material.
In general, the performance of blast furnace refractory spray coatings is affected by many factors and needs to be considered and optimized from many aspects.