Effect of additives on activated alumina
1, plastic solvent impact on activated alumina
To improve the adhesion involving particles of activated alumina, improving carrier strength, increase the structure, select acid glue solvent and solvent in the kneading adhesive dried aluminium hydroxide powder peptizing effect, producing false Sol, so particles bonded collectively for uncomplicated molding. Nitric acid, hydrochloric acid, acetic acid, formic acid, citric acid, trichloroacetic acid, which include adhesive solvent has a certain impact on physical properties of carriers, acidic adhesives solvent carrier drastically improves strength, improved structure. Inorganic acids (nitric acid and hydrochloric acid) has a powerful glue dissolving capacity, improves the porous structure, a clearance hole is highly concentrated in, fewer holes clear aperture greater than ten nm.
two, impact of Assistant agent on activated alumina
3 Assistant agent usually made use of in market: sesbania gum powder composite Assistant, polycarboxylic acids and their agents. Oxalic acid, tartaric acid, citric acid, polybasic acids for instance carrier on the extrusion and pore size distribution of a greater concentration of Aperture bigger than 10nm hole lower strength be elevated correspondingly, but carriers wear and extrusion speed improvement isn't apparent. Now the composite Assistant agent. Sesbania powder with acetic acid is excellent, the dosage impact of every element essential is composite extrusion ratio affect the strength.
3, the effects of pore of active alumina
Within the boehmite powder mixed within a smaller amount of pore-expanding agents like sesbania gum, cellulose, starch, material for example activated carbon or carbon black, extruded, and volatilize carbon or organic baking, leaving holes, developed some massive holes. Distinctive types of carbon black, carbon black powder loading distinct, reaming is distinct in the role of activated alumina. Carbon black for pore-expanding agents, has the advantage of pore distribution, choose the suitable kind of carbon black powder double pore size distribution and quantity is often prepared by the carrier on the key.
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