Method for preparing solid sodium aluminate
A sodium aluminate and solid technology, applied in the field of preparation of solid sodium aluminate, can solve the problems of inability to meet user requirements, difficult industrialized large-scale production, poor adaptability of raw materials, etc., and achieves convenient large-scale industrialized production, good product quality, and raw material cost. low effect
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Embodiment 1
[0031] The preparation method of solid sodium aluminate of the present invention, step is as follows:
[0032] (1) The particle size is 30μm 200g of bauxite, with The mass content of sodium oxide 368ml of 30% liquid sodium hydroxide was reacted at a reaction temperature of 100° C. and a reaction time of 2 hours to obtain a crude solution.
[0033] (2) Add milk of lime, a purification aid, to the crude liquid in an amount of 7% of the weight of the crude liquid, and filter to obtain the semen.
[0034] (3) Concentrate the semen, control the concentration of the concentrate to 33% after concentration, and keep the temperature at 90°C.
[0035] (4) Spray drying control: the air inlet temperature is 300°C, the flow rate of the concentrated solution is controlled at 9 L / min, and the concentrated solution is spray-dried to obtain 300 g of solid sodium aluminate product.
Embodiment 2
[0037] (1) The particle size is 70μm 200 g of aluminum hydroxide trihydrate and 200 g of solid caustic soda were dissolved in 300 ml of water for reaction at a reaction temperature of 110° C. and a reaction time of 2.5 hours to obtain a crude solution.
[0038] (2) Add 5 g of activated carbon to the crude liquid, filter to obtain semen.
[0039] (3) Concentrate the semen, control the concentration of the concentrated solution to 35% after concentration, and keep the temperature at 85°C.
[0040] (4) Spray drying control: the air inlet temperature is 400°C, and the concentrate flow rate is controlled at 11L / min. The concentrated solution was spray-dried to obtain 300 g of solid sodium aluminate product.
Embodiment 3
[0042] (1) The particle size is 100μm A total of 200g of 50% by weight of trihydrate aluminum hydroxide and 50% by weight of aluminum hydroxide (alkali content 20%) are dissolved in 300ml of water to react with solid caustic soda 160g, and mix with 100ml of alkali-containing waste liquid in the flow process simultaneously After the reaction, the reaction temperature was 110° C., and the reaction time was 1 hour to obtain a crude solution.
[0043] (2) Add purification aid lime milk to the thick liquid, the add-on is 7% of the weight of the thick liquid, filter to obtain a semen, then add 5 g of activated carbon, and filter to obtain the semen.
[0044] (3) Concentrate the semen, control the concentration of the concentrate to 40% after concentration, and keep the temperature at 95°C.
[0045] (4) Spray drying control: the air inlet temperature is controlled at 350°C, and the concentrate flow rate is controlled at 12L / min. The concentrated solution was spray-dried to obtain ...
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