Magnesia refractory mud uses various magnesia sands as raw materials, combined with clay, bentonite or chemical binders, or directly prepared with brine (MgCl₂). Magnesia refractory mud is mainly used in open-hearth furnaces, electric furnaces, oxygen converters, non-ferrous metal smelting furnaces, etc., which are built with magnesia bricks, magnesia-chrome bricks, magnesia-alumina bricks, etc.
Classification and application Magnesium refractory mud can be divided into hydraulic, heat-hardening and air-hardening refractory mud according to the coagulation and hardening characteristics of its binder. Hydraulic refractory mud uses cement as a binder and can be used at room temperature or in places where it may be in frequent contact with water or water vapor. Heat-hardening refractory mud is often made of heat-hardening binders such as phosphoric acid or phosphate. After hardening, this kind of mud has high strength at various temperatures, small shrinkage, tight joints and strong corrosion resistance. Air-hardening refractory mud is often prepared with air-hardening binders such as sodium silicate. This kind of magnesium refractory mud can make the joints of masonry tight.
Composition The powder for making magnesium refractory mud can be selected from fully sintered clinker and other various refractory raw materials with stable volume. The particle size of the powder depends on the use requirements, and its limit particle size is generally less than 1mm, and some are less than 0.5mm or finer. Reasonable particle composition has a great influence on ensuring the construction performance of the mud, and the same is true for binders and admixtures. With the higher requirements of users, chemical binders have been used more and more widely. Adding various admixtures to refractory mud can improve the construction performance of refractory mud, such as adding water retaining agent to extend the water loss time and ensure the construction quality; adding plasticizer can increase the plasticity of mud when the amount added is small; adding dispersant to improve the fluidity of mud, etc.
Magnesia refractory slurry
|
Type/Index |
MF-92 |
MF-95 |
MF-97 |
MZF-12 |
|
MgO % |
92 |
94.5 |
96.5 |
75 |
|
ZrO2 % |
-- |
-- |
-- |
12 |
|
Refracoriness≥ ℃ |
1790 |
1790 |
1800 |
1800 |
|
Bonding time min |
1-3 |
|||
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