The activated alumina raw material pseudoboehmite can be obtained by slowly introducing carbon dioxide gas into the sodium metaaluminate solution. Analysis of the gelation mechanism of NaAlO 2 solution and CO2 showed that the reaction was carried out at a lower temperature and vigorous stirring, and the pH of the reaction end should be between 10.5 and 11.
Discussion on the synthesis conditions of the positively active alumina ball raw material The activated alumina raw material pseudoboehmite can be obtained by slowly introducing carbon dioxide gas into the sodium metaaluminate solution. Analysis of the gelation mechanism of NaAlO 2 solution and CO2 showed that the reaction was carried out at a lower temperature and vigorous stirring, and the pH of the reaction end should be between 10.5 and 11. Therefore, the reaction temperature was initially determined to be 15 to 20 ° C, the pH at the end of the reaction was 10.5 to 11 , and the flow rate of the CO 2 gas was 0.3 to 0.5 m 3 /h. It was confirmed that the aluminum hydroxide formed under the selected experimental conditions mainly existed in the form of pseudo-boehmite of activated alumina raw material, and it was found that the reaction time was greatly affected by the concentration of sodium meta-aluminate. The higher the concentration of sodium metaaluminate, the longer the reaction time, but the reaction time is too long, and the crystal form of the resulting product is more complicated, so the concentration of sodium metaaluminate should not be too high. Experimental studies have found that the reaction time increases particularly fast when the concentration of sodium metaaluminate is above 2 mol/L. Therefore, from the viewpoint of improving productivity and controlling crystal form, the concentration of sodium metaaluminate is generally set to be 2 mol/L or less. The pH changes with reaction time under different sodium metaaluminate concentrations are shown in Figure 1. Under strong agitation, when the concentration of NaAlO2 is 2mol/L, the flow rate of CO2 is 0.3m3/h, the reaction temperature is controlled at 20°C, and the end point pH is around 10.5, XRD analysis shows that the product is mainly active oxidation. Aluminum raw material is made of boehmite. The activated alumina raw material pseudo-boehmite produced under this condition has a particle size of less than 100 nm and a good crystallinity. Http://news.chinawj.com.cn
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