Particle size adjustable boehmite preparation method
A boehmite, particle size technology, applied in chemical instruments and methods, inorganic chemistry, alumina/aluminum hydroxide, etc. The effect of short reaction time, lower energy consumption and lower production cost
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[0027] The preparation method of boehmite with adjustable particle size provided by the invention comprises the following steps:
[0028] S1: Dissolve the dispersing aid in water and adjust the pH to 7.5-9.5 to obtain an alkaline solution, then disperse aluminum hydroxide in the alkaline solution to form a suspension.
[0029] In one embodiment, the dispersing aid is sodium hydroxide, and the solid content in the suspension is 35 ± 2%. In the present invention, pure sodium hydroxide and aluminum hydroxide are used as raw materials to prepare boehmite. Among them, sodium hydroxide is used as a dispersing aid, mainly providing OH - with Al(OH) 3 reaction, thereby promoting the Al(OH) 3 Dissolution and dispersion, hydrothermal reaction of Al(OH) 3 In the process of continuously dissolving and regenerating crystals under hydrothermal conditions, adding dispersing aids can increase the dispersion and growth rate of boehmite crystals, while controlling the solid content to 35±2%,...
Embodiment 1
[0042] S1: Dissolve sodium hydroxide completely in water to obtain an alkaline solution with a pH of 9.5, then disperse aluminum hydroxide in the alkaline solution to obtain a suspension, and control the solid content of the suspension to 35%;
[0043] S2: Add the suspension into the reactor, control the filling rate of the reactor to 80%, raise the temperature to 205°C, conduct a hydrothermal reaction for 180 minutes, and then cool naturally to obtain boehmite slurry;
[0044] S3: Grinding the boehmite slurry with a sand mill, wherein the speed of the sand mill is 1200rpm, the number of sand grinding is 20 times, and then washed with pure water for 3 times, and then dried at 60°C for 14h to obtain boehmite product.
[0045] The boehmite product prepared in this example was tested and analyzed for particle size using a Malvern 3000 laser particle size analyzer. The test results show that the product prepared in this example has a median particle size of 2.3 μm and a particle s...
Embodiment 2
[0048] S1: Dissolve sodium hydroxide completely in water to obtain an alkaline solution with a pH of 8.5, then disperse aluminum hydroxide in the alkaline solution to obtain a suspension, and control the solid content of the suspension to 35%;
[0049] S2: Add the suspension into the reactor, control the filling rate of the reactor to 80%, raise the temperature to 203°C, conduct a hydrothermal reaction for 120 minutes, and then cool naturally to obtain boehmite slurry;
[0050] S3: Grinding the boehmite slurry with a sand mill, wherein the speed of the sand mill is 1200rpm, the number of sand grinding is 20 times, and then washed with pure water for 3 times, and then dried at 60°C for 14h to obtain boehmite product.
[0051] The boehmite product prepared in this example was scanned by an electron microscope, and the particle size was detected and analyzed using a Malvern 3000 laser particle size analyzer. The test results showed that the median particle size of the product pre...
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Abstract
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