Inspection Methods to Be Aware of When Using Activated Alumina
With decreasing particle size of activated alumina, the oxygen index increases rapidly, and the amount added reduces the processing performance and mechanical strength of the polymer. With increasing dosage, indicators such as elongation at break sharply decrease. Therefore, unilateral pursuit of ultra-fine particle size is not desirable. In order to improve the processability, density and availability of the polymer, activated alumina suppliers should also pay attention to particle grading and control the particle shape, so as to make the particle size as small as possible under larger filling amounts. When using activated alumina, the inspection method of its pre-sintering quality should be understood.
Inspection method for pre-sintering quality of activated alumina
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Staining method The activated alumina is a porous spherical structure with strong dye adsorption capacity. Therefore, the degree of transformation of activated alumina can be judged by the amount of adsorbed dye. The unstained activated alumina appears dark and the fully transformed activated alumina appears light in color. This method is easy to use but cannot be used for quantitative determination.
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Optical microscope method Determination of transformation is based on the refractive index difference of diiodomethane. Diiodomethane with a refractive index of 1.730 is generally used as the oil for measuring refractive index. Under polarized light microscopy, if the measured refractive index is less than 1.730, it belongs to activated alumina.
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Density method The quantity of activated alumina can be estimated based on the density of activated alumina after calcination, and the quality of calcination can be judged. Understanding the inspection method of the calcination quality of activated alumina can minimize the particle size of activated alumina within the allowable range.
Advantages of using activated alumina in amorphous refractory material composition
It can improve the density, fluidity, strength of the billet, increase the amount of secondary mullite generated, and reduce the amount of added water and air hole rate. Activated alumina can also be used as a desiccant with high water absorption and fast drying speed and can be regenerated. Activated alumina is a porous, high-dispersion, high-specific surface area alumina with adsorption and catalytic activity. It is suitable for drying of various gases and liquids, and used as an adsorbent, desiccant, catalyst, and carrier in many reaction processes such as petroleum, fertilizers, and chemicals. The product is processed with high-purity alumina through scientific configuration and catalytic refining.
It has high compressive strength, long service life, and can be repeatedly used through regeneration methods. The product is a white, spherical, porous, non-toxic, odorless, non-powdering, and non-soluble substance in water. It can adsorb and remove harmful fluorine in water, and can be used for defluorination, arsenic removal, sewage decolorization, deodorization, etc. The product is processed with high-purity alumina through scientific configuration and catalytic refining, and can adsorb and remove harmful fluorine in water, and can be used for defluorination, arsenic removal, sewage decolorization, deodorization, etc.
