What are high alumina refractory mud and high alumina phosphate mud? Through searching, it is not difficult to find that most refractory material manufacturers provide refractory slurries for use with refractory bricks. The high-alumina refractory mud is used to fill the joints of high-alumina refractory bricks.
High Alumina Refractory Mortar
High-aluminum refractory mud, high-aluminum fire mud is also called high-aluminum mud. It selects high-aluminum clinker as raw material, mixes with the binder, and mixes and mixes uniformly according to a certain ratio. Its function is to cooperate with the masonry of high-alumina bricks, and sometimes also act as a joint filler.
The high alumina refractory mud determines the Al2O3 content and the particle size of the high alumina clinker according to the brick composition and use requirements of the masonry part, so as to better match the high alumina bricks and resist the erosion of gas and slag.
Precautions for the Use of Alumina Refractory Mortar
According to the refractory bricks used, use the corresponding refractory mortar.
- Add water or binder in proportion, not too thick.
- Stir well after adding water or binder.
- Apply the thickness according to the requirements during masonry, even and appropriate.
- Use the prepared mud as soon as possible. If it hardens, it cannot be used again.
- When storing, do a good job of waterproofing and damp proofing to avoid agglomeration of mud and affect the use effect.
High Alumina Phosphate Mortar
High-alumina phosphate mud is used as a joint material for masonry-shaped refractory products. It is composed of refractory powder, water or liquid binder, and additives (such as dispersant, plasticizer, stabilizer, or water-retaining agent). It is a kind of paste-like slurry with a high concentration of solid particles, which has the characteristics of Bingham fluid.
Generally speaking, the chemical properties of refractory mud should be similar to the chemical properties of refractory products. Therefore, it is the same as the classification of refractory products. There are siliceous, semi-silica, clay, high-aluminum, corundum, magnesia, magnesia, magnesia, chromium, carbon, or silicon carbide slurries. The high-strength phosphate refractory slurry is formulated with five raw materials, including phosphoric acid, aluminum chips, high-aluminum powder, aggregates, and additives in a certain proportion. Phosphoric acid reacts chemically with aluminum chips to form Al(H2PO4)3. Al(H2PO4)3 is the binder of the mud, high alumina powder increases the chemical activity of the mud, high alumina aggregate improves the thermal stability of the mud, and additives enhance the adhesion of Al(H2PO4)3 to refractory bricks.
The preparation process of high-strength phosphate refractory slurry. Put a certain proportion (weight) of phosphoric acid into a non-metallic container and heat it to 60°C. Then add aluminum scraps and additives in proportion, and remove unreacted aluminum scraps after the reaction stops. Then put the high-aluminum aggregate and high-aluminum powder into the container in batches, mix well and let stand for 1 hour. The adjusted mud should be dry and wet properly. Too dry mud reduces free Al (H2PO4) 3 and reduces bonding strength. Too thin mud has too much free water so that the porosity of the mud is too large after it dries, and the strength of the mud itself is reduced. It is advisable to blend it to flow, draw into silk, and have adhesive strength after use. The bonded refractory bricks can be dried immediately or after a period of time.
High-strength phosphate refractory mud can be used in heating furnaces for clay bricks, light clay bricks, high alumina bricks, silica bricks, mullite bricks, corundum bricks, etc. Especially it has a better effect when used in heat treatment furnaces.
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What should I do if the refractory material cracks, falls off, and is easy to wear? To completely solve the problem, it is necessary to conduct a specific analysis from the consolidation of the refractory lining and the working conditions. Only in this way can the real cause be analyzed. Rongsheng refractory manufacturers have been engaged in refractory production and R&D services for many years, and have helped solve refractory lining problems in more than 60 countries, for example, Russia, South Africa, Kazakhstan, Philippines, Chile, Malaysia, Uzbekistan, Indonesia, Vietnam, Kuwait, Turkey, Zambia, Peru, Mexico, Qatar, etc. If you want to learn more about refractory materials, please follow our blog. To purchase high-quality refractory lining products, please contact us.
