Low-cost magnesium-aluminum hydrotalcite preparation method
A magnesium-aluminum hydrotalcite, low-cost technology, applied in the preparation of alkali metal sulfites, chemical instruments and methods, aluminum compounds, etc., can solve the problem of high cost, achieve cheap use cost, reduce production cost, and achieve significant actual benefits Effect
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Embodiment 1
[0035] In a 30m3 stirred reactor, add 20m3 industrial water, add 1 ton of light-burned magnesium oxide powder (magnesia content is 90%), stir, and then pass high-concentration sulfur dioxide, react at 45°C for 10 hours, and then oxidize Magnesium is converted into soluble magnesium bisulfite solution, filtered to remove impurities, and refined magnesium bisulfite solution is obtained.
[0036] Wherein, the molar ratio of the above-mentioned magnesium oxide to sulfur dioxide is 1.4.
[0037] Add 8.44 tons of 32% sodium hydroxide solution to a 15 m3 dissolution tank, add 0.8775 tons of aluminum hydroxide, heat to 95 ° C to dissolve, add 0.6 tons of sodium carbonate, stir until dissolved, and obtain sodium metaaluminate and carbonic acid sodium solution.
[0038] In a 50 m3 reaction tank, add 20 m3 magnesium bisulfite solution, add sodium metaaluminate, sodium carbonate, and sodium hydroxide solution, stir, raise the temperature to 95°C, and react for 10 hours to obtain magnesiu...
Embodiment 2
[0043] The difference between this example and Example 1 is that the reaction conditions of light-burned magnesium oxide powder and high-concentration sulfur dioxide are 6 hours at 25°C; the molar ratio of magnesium oxide to sulfur dioxide is 1.6; sodium metaaluminate and sodium carbonate solution are prepared Heating to 85°C during the process; the magnesium bisulfite solution, sodium aluminate, sodium carbonate, and sodium hydroxide solution are mixed and stirred to react with the conditions of heating up to 85°C and reacting for 8 hours.
[0044]Take the appropriate amount of magnesium aluminum hydrotalcite product obtained in the above preparation process as a sample, and use the same detection means as in Example 1 to characterize and analyze the sample, and the particle size of the sample is measured between 20-94nm, and the purity is 94.3%. It can be proved that the product has high crystallinity and meets the performance index of the magnesium aluminum hydrotalcite prod...
Embodiment 3
[0046] The difference between this example and Example 1 is that the reaction conditions of light-burned magnesia powder and high-concentration sulfur dioxide are 65°C for 12 hours; the molar ratio of magnesia to sulfur dioxide is 1.8; sodium metaaluminate and sodium carbonate solution are prepared Heating to 105°C during the process; the magnesium bisulfite solution, sodium aluminate, sodium carbonate, and sodium hydroxide solution are mixed and stirred to react with the conditions of heating up to 105°C and reacting for 16 hours.
[0047] Take the appropriate amount of magnesium aluminum hydrotalcite product obtained in the above preparation process as a sample, and use the same detection means as in Example 1 to characterize and analyze the sample, and the particle size of the sample is measured between 20-97nm, and the purity is 94.2%. It can be proved that the product has high crystallinity and meets the performance index of the magnesium aluminum hydrotalcite product prep...
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