Preparation method of tobermorite
A tobermorite and desiliconization technology, which is applied in the field of production of tobermorite preparation, can solve the problems of unstable water between layers of molecular structure and the like, and achieve the effects of good thermal stability and volume stability.
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Embodiment 1
[0018] Add 20 g of fly ash to 81.43 g of 14% sodium hydroxide solution, stir to form a slurry, control the mass ratio of sodium hydroxide and fly ash to 0.5:1 under this condition, and the temperature of the slurry rises to 120°C, desiliconization under this condition for 2 hours, after the reaction, the desilication slurry is separated from solid and liquid, and the desilication filtrate is finely filtered through a leaf filter. The solid is used as the raw material for alumina production, and the liquid is the desiliconization. Silicon liquid, diluted with water to 2.67L, wherein, SiO 2 The concentration is 2.99g / L, and it is used as the siliceous raw material for hydrothermal synthesis of tobermorite. Then the limestone obtained from the quarry is crushed, washed and graded, and the size is controlled to 80mm. It is calcined with 30mm anthracite in the vertical kiln, and the obtained lime is sieved to remove cinder (ash), small lime and lime dust. After crushing to 20mm, m...
Embodiment 2
[0020] Adding 20 g of fly ash to 60 g of 15% sodium hydroxide solution and stirring to form a slurry, under this condition the mass ratio of sodium hydroxide and fly ash dry basis is controlled to be 0.45:1, and the temperature of the slurry rises To 115°C, desiliconization under this condition for 3 hours. After the reaction, the desiliconization slurry is separated from solid and liquid, and the desilication filtrate is finely filtered through a leaf filter. The solid is used as the raw material for alumina production, and the liquid is the desiliconization liquid. , diluted to 3L, its SiO 2 The concentration is 2.67g / L, and it is used as the siliceous raw material for hydrothermal synthesis of tobermorite. After the limestone obtained from the quarry is crushed, washed and graded, the size is controlled to be 70mm, and 25mm anthracite is used for calcination in the vertical kiln, and the obtained lime is sieved to remove cinder (ash) and small lime and lime dust. After cru...
Embodiment 3
[0022] Fly ash 20g is joined in the sodium hydroxide solution 75g that concentration is 16%, forms slurry after stirring, controlled the mass ratio of sodium hydroxide and fly ash dry basis under this condition to be 0.6:1, the slurry temperature rises To 125°C, desiliconization under this condition for 2.5 hours, after the reaction, the desilication slurry is separated from solid and liquid, and the desilication filtrate is finely filtered through a leaf filter. The solid is used as the raw material for alumina production, and the liquid is desilication solution, diluted to 4L, its SiO 2 The concentration is 2.88g / L, and it is used as the siliceous raw material for hydrothermal synthesis of tobermorite. Then the limestone obtained from the quarry is crushed, washed and graded, and the size is controlled to 90mm. It is calcined with 35mm anthracite in the shaft kiln, and the obtained lime is sieved to remove cinder (ash), small lime and lime dust. After crushing to 12mm, mix ...
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