Alumina preparation method
A technology of alumina and aluminum sulfate, applied in the preparation of alumina/hydroxide, etc., can solve the problems of long production process, high preparation cost, small specific surface area, etc., and achieves short process, simple and easy operation steps, and improved properties. Effect
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Embodiment 1
[0030] (1) Mix 10g of aluminum sulfate, 0.25g of ferric nitrate, and 100mL of distilled water evenly, then place in a 70°C water bath and stir until the solution becomes viscous; then dry at 120°C for 10 hours.
[0031] (2) Put the substance obtained in the previous step in a closed reactor, and feed hydrogen gas at a flow rate of 400mL / min; heat up to 300°C at 5°C / min for 2 hours; then heat up to 600°C at 5°C / min for 3 hours .
[0032] (3) Mix the substance obtained in the previous step with 5L hydrochloric acid (8%) and treat it at 25°C for 2h, then wash with distilled water until neutral, and dry at 120°C for 10h to obtain the alumina product. The obtained sample number is CL1, and the crystal phase structure is shown in figure 1 , the pore size distribution see figure 2 , and other properties are shown in Table 1. From figure 1 , figure 2 It can be seen from Table 1 that the obtained sample is γ-alumina with good pore structure.
Embodiment 2
[0034] (1) Mix 15g of aluminum sulfate, 0.25g of ferric nitrate, and 100mL of distilled water evenly, then place in a 75°C water bath and stir until the solution becomes viscous; then dry at 120°C for 10 hours.
[0035] (2) Put the substance obtained in the previous step in a closed reactor, and feed hydrogen gas at a flow rate of 500mL / min; heat up to 320°C at 8°C / min for 2 hours; then heat up to 650°C at 8°C / min for 4 hours .
[0036] (3) Mix the substance obtained in the previous step with 5.5L hydrochloric acid (8%) and treat it at 25°C for 3 hours, then wash it with distilled water until it becomes neutral, and dry it at 120°C for 10 hours to obtain the alumina product. The obtained sample number is CL2, and the obtained sample is γ-alumina with good pore structure.
Embodiment 3
[0038] (1) Mix 20g of aluminum sulfate, 0.3g of ferric nitrate, and 150mL of distilled water evenly, then place them in a water bath at 85°C and stir until the solution becomes viscous; then dry at 120°C for 10 hours.
[0039] (2) Put the substance obtained in the previous step in a closed reactor, and feed hydrogen gas at a flow rate of 500mL / min; heat up to 320°C at 11°C / min for 2 hours; then heat up to 550°C at 11°C / min for 4.5 h.
[0040] (3) Mix the substance obtained in the previous step with 4L hydrochloric acid (7%) and treat it at 25°C for 2h, then wash with distilled water until neutral, and dry at 120°C for 10h to obtain the alumina product. The obtained sample number is CL3, and the obtained sample is γ-alumina with good pore structure.
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