1. Preparazzjoni of aluminum dihydrogen phosphate solution. After reacting phosphoric acid and aluminum hydroxide with All alumina to produce (OH) {{4=}}Al (H2PO4) 3+3}}}}H2O, water was added to form a solution with a mass concentration of 50%. At 20 degree , the relative density was 1.{47-1.48, pH{=1.{{{}}{{}}{{}}{{}{{}}.{{}}.5-2}, and n (P2O5)% 3a n (Al2O3)=3. Store in glass bottles or plastic barrels and tightly seal them.
2. Selection of refractory powder. Refractory powder can be selected from alumina, pyroxene clinker, high alumina clinker, etc. The following ratio method can be used: 85% (w) alumina+15}% (W) bentonite, and 3%~5% (w) Cr2O3; 85% (w) Aluminum oxide+15}% (a) bentonite; 85% (w) pyroxene clinker+15% (W) bentonite; 90%; (w) High alumina clinker+10% (w) bentonite. Thick material, high sintering strength, and poor room temperature viscosity; The material is fine and has good room temperature viscosity, but the sintering strength is slightly poor, usually ranging from 200 to 300 mesh.
3. Attachment operation. When in use, pour the aluminum dihydrogen phosphate solution into the refractory powder and mix it to form a paste for pasting. Too thick, low viscosity, difficult to stick; Too thin, low viscosity, low viscosity, sharp decrease in sintering strength, moderat viscosity.
4. Storage. The prepared mud should not be stored for a long time and should be prepared for immediate use. If long-term storage is required, retarders such as oxalic acid should be added.
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