- Time:Jan 05, 2023
Refractory mud mainly plays a refractory brick and brick in the middle of the gray seam connection; types of clay, high alumina, corundum, mullite, silica, etc., and there are light and heavy quality.
The bonding agents for refractory clay are dextrin and CMC bonding, phosphoric acid bonding, aluminum dihydrogen phosphate bonding, and water glass bonding. The most used is dextrin and CMC bonding. In the case of temperature higher than 1350℃, phosphoric acid and dihydroaluminum phosphate bonding is mostly used so that the voids between refractory bricks can be bonded into a whole under high temperature to improve the resistance to erosion.
If you do not add any binding agent refractory mud, there will be an increase in the ash gap, mud precipitation, delamination, bonding time is too short, and shrinkage at high temperatures is also relatively large, affecting the construction performance and use effect.
Masonry properties and mechanical properties of refractory mud are determined by binding agents and admixtures. The addition of binding agents can improve the dispersibility and hydrophilicity of refractory mud, form suspensions and play a plasticizing role. Especially after the addition of binding agent, the mud does not separate, does not precipitate, does not flow, does not dry up. Refractory mud does not shrink and porosity decreases under high temperature, and it can improve folding and strength.
In particular, the refractory mud after adding phosphoric acid and aluminum dihydrogen phosphate bonding, can regulate the bonding time and flexural strength, plasticity can make the brick and the brick overall stronger. The addition of aluminum dihydrogen phosphate can be directly added to the use of drinking water, phosphoric acid added to the bonding agent can be added to a very small amount of water. And phosphoric acid composition of more mud, is directly for use. And the use of the effect than the general refractory mud will be several times higher than the use of the cycle.
And add water glass as a binding agent refractory mud, is used in acidic composition of the refractory brick connection with, carbon mud is to do carbon brick connection with, different types of refractory mud is selected according to different refractory brick material and the same material fire mud to connect, use when the choice must be and refractory brick with the material.
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