Ultrafine aluminum hydroxide seed crystal and preparation method thereof, and submicron aluminum hydroxide and preparation method and application thereof
A technology of ultra-fine aluminum hydroxide and aluminum hydroxide, which is applied in the preparation of alkali metal aluminate/aluminum oxide/aluminum hydroxide, textile and papermaking, and the addition of inorganic compounds, etc., and can solve the problem of coarse particle size of submicron aluminum hydroxide , poor activity and other problems, to achieve the effect of small seed crystal particle size, small seed crystal particle size and high activity
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Embodiment 1
[0069] Embodiment 1 provides a kind of superfine aluminum hydroxide seed crystal and preparation method thereof, and the method comprises the steps:
[0070] 1) Add water to aluminum hydroxide, control the solid content at 220g / l, grind for 60min at a speed of 1000r / min, and obtain D 50 1.5μm and D 99 It is a fine-grained aluminum hydroxide seed slurry of <8 μm.
[0071] 2) to 1 liter of Al 2 o 3 Add 15ml to the sodium aluminate solution with a concentration of 125g / L and a caustic ratio of 1.35 (the mass ratio of the aluminum hydroxide converted to alumina to the alumina in the aluminate solution is 1.7:100, that is, the seed rate is 1.7% ) the slurry of the fine-grained aluminum hydroxide seed in step 1), the system was kept in a container at 55° C. and decomposed with stirring at a rate of 180 r / min for 3 hours to obtain the seed slurry (containing a large amount of submicron seeds of aluminum hydroxide).
Embodiment 2
[0073] Embodiment 2 provides a kind of superfine aluminum hydroxide seed crystal and preparation method thereof, and this method comprises the steps:
[0074] 1) Add water to aluminum hydroxide and make a slurry, control the solid content to 220g / l, and grind for 50 minutes at a stirring speed of 600 rpm to obtain D 50 1.8μm and D 99 It is a 7.5 μm fine-grained aluminum hydroxide seed slurry.
[0075] 2) to 1 liter of Al 2 o 3 Concentration is 125g / L, the sodium aluminate solution that caustic ratio is 1.35, add 12ml the fine-grained aluminum hydroxide seed crystal that step 1) makes, keep this system in the container of 45 ℃ and stir and decompose at the speed of 180r / min 3 hour, obtain the seed crystal slurry (the seed crystal slurry contains a large amount of submicron aluminum hydroxide seed crystals).
Embodiment 3
[0077] Embodiment 3 provides a kind of crystal seed of ultrafine aluminum hydroxide and preparation method thereof, and this method comprises the steps:
[0078] 1) Add water to aluminum hydroxide, control the solid content to 240g / l, and grind for 60 minutes at a stirring speed of 800 rpm to obtain D 50 1.6μm and D 99 It is a 7.8μm fine-grained aluminum hydroxide seed slurry.
[0079] 2) to 1 liter of Al 2 o 3 Add 25ml of sodium aluminate solution with a concentration of 125g / L and a caustic ratio of 1.35 (the mass ratio of aluminum hydroxide converted to alumina to alumina in the aluminate solution is 4.8:100, that is, the seed rate is 4.8% ) The fine-grained aluminum hydroxide seed slurry obtained in step 1) was kept in a container at 50° C. and decomposed with stirring at a rate of 180 r / min for 3 hours to obtain the seed slurry (containing a large amount of submicron seeds of aluminum hydroxide).
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