Rapid preparation process of rice-grain-shaped light calcium carbonate
A light calcium carbonate, preparation technology, applied in the direction of calcium carbonate/strontium/barium, calcium/strontium/barium compounds, inorganic chemistry, etc., can solve the irregular shape of product particles, long carbonation reaction time, particle size Inhomogeneity and other problems, to achieve the effect of reducing the carbonation reaction time, uniform and stable quality, and short reaction time
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Embodiment 1
[0025] The rapid preparation process of rice granular light calcium carbonate belongs to the carbonization method of calcium hydroxide solution to prepare rice granular light calcium carbonate. The preparation method comprises the following steps:
[0026] (1) Lime digestion and calcium hydroxide slurry preparation: Lime and water at room temperature with a mass ratio of 1:4 are fully stirred and digested and properly aged and cooled, and the obtained lime slurry is sieved to remove large particles and impurities to obtain refined hydrogen Calcium oxide slurry, after adjusting the calcium hydroxide slurry to cool to room temperature, adjust the calcium hydroxide solid content to be 15%;
[0027] (2) Addition of alkali metal ions: pump the adjusted calcium hydroxide slurry into the intermittent bubbling carbonization tower with a stirring device, add sodium carbonate as alkali metal ions, and adjust the concentration of sodium ions in the slurry to 2.8mol / L, stir evenly;
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Embodiment 2
[0031] The rapid preparation process of rice granular light calcium carbonate belongs to the carbonization method of calcium hydroxide solution to prepare rice granular light calcium carbonate. The preparation method comprises the following steps:
[0032] (1) Lime digestion and calcium hydroxide slurry preparation: Lime and water at room temperature with a mass ratio of 1:6 are fully stirred and digested and properly aged and cooled, and the obtained lime slurry is sieved to remove large particles and impurities to obtain refined hydrogen Calcium oxide slurry, after adjusting the calcium hydroxide slurry to cool to room temperature, adjust the calcium hydroxide solid content to be 12%;
[0033] (2) Addition of alkali metal ions: pump the adjusted calcium hydroxide slurry into the intermittent bubbling carbonization tower with stirring device, add sodium hydroxide as alkali metal ions, and adjust the concentration of sodium ions in the slurry to 2.0mol / L, stir evenly;
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Embodiment 3
[0037] The rapid preparation process of rice granular light calcium carbonate belongs to the carbonization method of calcium hydroxide solution to prepare rice granular light calcium carbonate. The preparation method comprises the following steps:
[0038] (1) Lime digestion and calcium hydroxide slurry preparation: Lime and water at room temperature with a mass ratio of 1:8 are fully stirred and digested and properly aged and cooled, and the obtained lime slurry is sieved to remove large particles and impurities to obtain refined hydrogen Calcium oxide slurry, after adjusting the calcium hydroxide slurry to cool to room temperature, adjust the calcium hydroxide solid content to be 13%;
[0039] (2) Addition of alkali metal ions: pump the adjusted calcium hydroxide slurry into the intermittent bubbling carbonization tower with stirring device, add sodium bicarbonate as alkali metal ions, and adjust the concentration of sodium ions in the slurry to 1.8mol / L, stir evenly;
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