Refractory dry ramming mass product structure
Refractory dry ramming mass is a granular and powdery material made of refractory raw materials, often containing appropriate binders, and made by reasonable grading and kneading, in a loose shape. Similar to dry hard castables, but some do not have self hardening binders. Usually, it needs to be constructed by strong ramming, hence the name ramming material.
Composition of ramming material:
Refractory dry ramming mass products are composed of refractory aggregates, refractory powders, additives, etc. Irregularly shaped aggregate particles are conducive to the interpenetration, occlusion and pinning between the particles, and can improve the bonding strength. After the fire-resistant aggregate is fired, it forms the skeleton of the material, which can improve the thermal shock stability and strength of the material. Refractory powder has a certain fluidity, which can fill material voids, increase the volume density of the material, and improve construction performance. At the same time, the activity of the fine powder is stronger than the aggregate particles, and it can react with the additives in the material first to increase the strength of the material or improve Other properties of materials. The manufacturer of Refractory dry ramming mass tells you that for unshaped refractories, the continuous particle gradation between refractory aggregate and powder has a great influence on the density of the material, which affects the bulk density, porosity, strength and resistance of the material. Slag performance.
In the refractory dry ramming mass, the proportion of granular and powdery materials is very high, while the proportion of binder and other components is very low, and even all consists of granules and powdery materials.
In the refractory dry ramming mass, the appropriate bonding agent is often selected according to the material and use requirements of the granular and powdery materials. Some ramming materials do not use the bonding agent, or only add a small amount of flux to promote its sintering. Binders such as sodium silicate, ethyl silicate and silica gel are commonly used in acid ramming materials. Among them, dry ramming materials mostly use borate, and alkaline ramming materials commonly use aqueous solutions of magnesium chloride and sulfate, as well as some phosphates and their polymers. Organic compounds and temporary binders that can form carbon bonds at high temperatures are also often used with higher carbon content. Among them, dry ramming material is added with a suitable iron-containing flux. Glauber's salt is also commonly used in chromium ramming materials. High-aluminum and corundum ramming materials often use inorganic substances such as phosphoric acid and aluminum phosphates, oxide salts and sulfates. Temporary bonding agents can also be used. Aluminum silicate ramming materials sometimes only add appropriate soft clay, or Add a small amount of the above-mentioned binding agent. Carbonaceous ramming materials mainly use binders that form carbon bonds.
Refractory dry ramming mass generally does not add admixtures such as plasticizers and retarders. The moisture content is also low. When a non-water-soluble organic binder is used, there is no water in the mixture. In some ramming materials, refractory fibers are also used as reinforcing materials.
The manufacturer of Refractory castable cement tells you a kind of granular and powdery material made of refractory materials with a certain amount of binder. With high fluidity, it is suitable for unshaped refractory materials formed by casting.
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