Preparation method of alumina dry glue
A technology for alumina dry glue and gel formation, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, chemical instruments and methods, catalyst carriers, etc. Complex process and other problems, to achieve the effect of suitable bubble size, low cost and reasonable pore distribution
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Embodiment 1
[0025] Take industrial grade aluminum hydroxide powder and industrial grade sodium hydroxide to prepare a concentration of 365 gAl 2 o 3 / L concentrated sodium metaaluminate solution, then diluted to a concentration of 25 gAl 2 o 3 / L of sodium metaaluminate solution, the gelling temperature is controlled at 29°C, polyoxyethylene polyoxypropylene pentaerythritol ether is added, the amount of surfactant accounts for 1.5% of the weight of sodium metaaluminate, air and CO 2 A mixture of gases, where CO 2 The volume concentration is 50%, and the mixed gas is used to stir. When the pH value drops to 10, the gelation is stopped, and the gelation time is 40 minutes. The slurry was washed with deionized water at 50° C. until neutral, and dried at 120° C. for 3 hours to obtain an alumina gel. Table 1 shows the physical and chemical properties obtained after calcination at 750°C for 3 hours.
Embodiment 2-3
[0027] The preparation method of alumina dry glue is identical with embodiment 1, and its difference is that the concentration of concentrated sodium metaaluminate solution is diluted to 30gAl respectively 2 o 3 / L, 35gAl 2 o 3 / L, the physical and chemical properties of the obtained alumina dry glue after roasting are shown in Table 1.
Embodiment 4-5
[0029] The preparation method of alumina dry glue is the same as that of Example 1, the difference is that the nonionic surfactant is changed into polyoxyethylene polyoxypropanolamine ether and polyoxypropylene oxide ethylene glyceryl ether, and its consumption is sodium metaaluminate 2.0% by weight. The physical and chemical properties of the obtained alumina dry glue after roasting are shown in Table 1.
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