Process for preparing spherical high purity alumina
A high-purity alumina, spherical technology, applied in the direction of alumina/hydroxide preparation, sustainable building, climate sustainability, etc., can solve the problems of low strength, difficult to control the particle size distribution of spherical particles, etc., to achieve bulk density High, simple manufacturing process, good fluidity
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[0029] Example 1
[0030] The pre-prepared 0.1M high-purity aluminum ammonium sulfate solution and 1.0M high-purity ammonium bicarbonate solution were flowed into a 10-liter reactor with stirring at a speed of 15ml / min through a peristaltic pump. The stirring speed was 1000rpm, and the temperature was controlled. At 25±1℃, the pH of the end point of the reaction is controlled at 9.0, the slurry stays in the reactor for 7 hours, flows into the aging sedimentation tank, stands for 2 hours at room temperature, and is filtered and washed to obtain aluminum ammonium carbonate (AACH ) Filter cake (e.g. Figure 1 Show), with 51% water attached, the filter cake is calcined in a high temperature muffle furnace at 900°C for 1 hour to obtain γ-Al 2 O 3 Powder (e.g. figure 2 Shown). The average particle diameter of the powder is 5.3μm, and the BET specific surface area is 240.5m 2 / g.
Example Embodiment
[0031] Example 2
[0032] The pre-prepared 0.2M high-purity aluminum ammonium sulfate solution and 2.0M high-purity ammonium bicarbonate solution were flowed into a stirred 10-liter reactor at a speed of 20ml / min through a peristaltic pump. The stirring speed was 1500rpm, and the temperature was controlled. At 35±1℃, the pH of the end point of the reaction is controlled at 9.5, the slurry stays in the reactor for 8 hours, flows into the aging sedimentation tank, stands for 2 hours at room temperature, and is filtered and washed to obtain aluminum ammonium carbonate (AACH ) Filter cake (e.g. Figure 3 Show), with 48% water attached, the filter cake is calcined in a high-temperature muffle furnace at 900°C for 1 hour to obtain γ-Al 2 O 3 Powder (e.g. Figure 4 Shown), the average particle diameter of the powder is 7.6μm, and the BET specific surface area is 230.84m 2 / g.
Example Embodiment
[0033] Example 3
[0034] The γ-alumina in Example 1 was calcined at 1200°C for 1 hour to obtain α-Al 2 O 3 Powder (e.g. Figure 5 Shown), the average particle diameter of the powder is 4.7μm, and the BET specific surface area is 5.2m 2 / g, loose density 0.35g / cm 3 .
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