The significance of the consistency and spreadability of refractory mud？
01. The significance of consistency to refractory castables
Consistency is an indicator for evaluating the fluidity of refractory slurries, waterless slurries, and refractory coatings. The measurement method is generally to use a copper or aluminum cone placed in a certain volume to measure the consistency of the slurry. The greater the depth of penetration, the less dense the slurry will be.
The fluidity of refractory castables is evaluated by the time it takes to flow out. The greater the fluidity value, the smaller the consistency. Consistency is of little significance for refractory castables.
02. Important factors affecting the consistency of refractory mud
The influence on consistency is usually that the higher the content of solid particles in the slurry, the greater the resistance to flow of the slurry, and the greater its consistency; the higher the sphericity of the particle shape, the better its fluidity and the smaller its consistency. The greater the viscosity of the slurry, the greater its consistency. In fact, the composite additives in refractory mud have a great influence on the fluidity of the slurry. It is an important factor in adjusting consistency.
03.The meaning of malleability
The significance of malleability is an index that measures the ease with which mud and refractory coating materials can be evenly applied to the surface of refractory products or masonry. It is of great significance for the formation of uniform thickness of refractory slurry and paste-like coating materials in masonry. Refractory mud with good spreadability has certain plasticity even when applied. This plasticity is achieved by adding plasticizers and water-retaining agents. Common ones include plastic viscose, carboxycellulose, methylcellulose sodium salt, lignosulfonate, dextrin, silica sol, etc.
04.Conclusion
Among them, carboxymethyl cellulose has the functions of plasticizing and retaining water. Apply it on the bonding surface between refractory bricks, and then rub the two bricks back and forth or left and right until they can no longer be rubbed. The time for this rubbing is the setting time.