A method for preparing 4a zeolite with laterite nickel ore acid leaching slag as raw material
A technology of laterite nickel ore and acid leaching slag, which is applied in the field of environment and materials, can solve the problems of high raw material prices, and achieve the effect of low cost and simple process
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Embodiment 1
[0020] After grinding the acid leaching slag of laterite nickel ore and sodium hydroxide, according to the molar ratio of sodium to silicon n(Na 2 O) / n(SiO 2 ) at a ratio of 1.6:1 and mixed evenly, and reacted with alkali at 450°C for 4 hours, according to the molar ratio of water to sodium n(H 2 O) / n(Na 2 O) After adding water in an amount of 110:1, filter to obtain the filtrate. Into the filtrate according to the molar ratio of silicon to aluminum in the system n(SiO 2 ) / n(Al 2 o 3 ) at a ratio of 1.5:1 by adding sodium metaaluminate, transferring the resulting suspension to a reactor for crystallization at 70°C for 24 hours, cooling to room temperature, filtering, washing, and drying to finally obtain 4A zeolite.
Embodiment 2
[0022] After grinding the acid leaching slag of laterite nickel ore and sodium hydroxide, according to the molar ratio of sodium to silicon n(Na 2 O) / n(SiO 2 ) at a ratio of 1.4:1 and mixed evenly, and reacted with alkali at 550°C for 3 hours, according to the molar ratio of water to sodium n(H 2 O) / n(Na 2 O) After adding water in an amount of 70:1, filter to obtain the filtrate. Into the filtrate according to the molar ratio of silicon to aluminum in the system n(SiO 2 ) / n(Al 2 o 3 ) was added with sodium metaaluminate at a ratio of 2:1, the resulting suspension was transferred to a reactor for crystallization at 80°C for 12 hours, cooled to room temperature, filtered, washed, and dried to obtain zeolite 4A.
Embodiment 3
[0024] After grinding the acid leaching slag of laterite nickel ore and sodium hydroxide, according to the molar ratio of sodium to silicon n(Na 2 O) / n(SiO 2 ) at a ratio of 1.5:1, mixed evenly, and reacted with alkali at 600°C for 2 hours, according to the molar ratio of water to sodium n(H 2 O) / n(Na 2 O) After adding water in an amount of 90:1, filter to obtain the filtrate. Into the filtrate according to the molar ratio of silicon to aluminum in the system n(SiO 2 ) / n(Al 2 o 3 ) was added in an amount of 2:1, and the resulting suspension was transferred to a reaction kettle for crystallization at 90°C for 6 hours, cooled to room temperature, filtered, washed, and dried to finally obtain 4A zeolite.
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