A kind of method that uses phosphoric acid to make crystal seed to produce superfine aluminum hydroxide
A technology of ultra-fine aluminum hydroxide and aluminum hydroxide, which is applied in the preparation of alkali metal aluminate/aluminum oxide/aluminum hydroxide, etc., can solve the problems of high production cost of ultra-fine aluminum hydroxide and achieve supersaturation Low density, low decomposition rate and good particle size
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[0024] Below by embodiment the present invention is further illustrated.
[0025] Example 1
[0026] Add 180g of Bayer-process aluminum hydroxide to 400ml caustic soda solution with a caustic concentration of 220g / L, and re-dissolve at 105°C, the α of the sodium aluminate solution k is 1.31. Under the condition of 40-45°C constant temperature water bath, add 2mol / L phosphoric acid and redissolved sodium aluminate solution into the seed tank in a homogeneous flow mode, the reaction time is 30min, and the pH of the reaction solution is 8.5-9.5 at the end of the control. 40 Aged at -45°C for 24 hours, separated, washed, and filtered to obtain highly active seed crystals (D50=1.00 μm). With the seed crystal coefficient as 10%, the above-mentioned seeds are added to the sodium aluminate solution after dilution (caustic alkali concentration is 120g / L, α k =1.34), in a 60°C hot water bath, the stirring speed is 360r / min, and the reaction time is controlled at 20h. After the react...
Embodiment 2
[0028] Add 200g of Bayer-process aluminum hydroxide to 500ml caustic soda solution with a caustic concentration of 220g / L, and re-dissolve at 105°C, the α of the sodium aluminate solution k is 1.38. Under the condition of 40-45°C constant temperature water bath, add 2mol / L phosphoric acid and redissolved sodium aluminate solution into the seed tank in a homogeneous flow mode, the reaction time is 45min, and the pH of the reaction solution at the end of the control is 8.5-9.40 Aged at -45°C for 24 hours, separated, washed, and filtered to obtain highly active seed crystals (D50=0.82 μm). With the seed crystal coefficient as 20%, the above-mentioned seed crystals are added to the sodium aluminate solution after dilution (caustic alkali concentration is 130g / L, α k =1.41), in a 60°C hot water bath, the stirring speed is 360r / min, and the reaction time is controlled at 20h. After the reaction is over, the liquid and solid are separated, the filter cake is washed with hot water u...
Embodiment 3
[0030] Add 200g of Bayer-process aluminum hydroxide to 500ml caustic soda solution with a caustic concentration of 220g / L, and re-dissolve at 105°C, the α of the sodium aluminate solution k is 1.44. Under the condition of 40-45°C constant temperature water bath, add 2mol / L phosphoric acid and redissolved sodium aluminate solution into the seed tank in a homogeneous flow mode, the feeding time is 60min, and the pH of the reaction solution at the end of the control is 8.5-9.40 Aged at -45°C for 24 hours, separated, washed, and filtered to obtain highly active seed crystals (D50=0.91 μm). Be that 30% with seed crystal coefficient add above-mentioned seed crystal to the sodium aluminate solution after dilution (caustic alkali concentration is 110g / L, α k =1.5), in a hot water bath at 60°C, the stirring speed is 360r / min, and the reaction time is controlled at 20h. After the reaction was completed, the liquid and solid were separated, and the filter cake was washed with hot water...
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