Preparation method of modified red mud composite polymer gel to remove cr(ⅵ) filler
A composite polymer and red mud technology, applied in the restoration of polluted soil, etc., can solve the problems of heavy financial burden and insufficient capital investment, and achieve the effect of improving economy, reducing repair cost and improving removal rate
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Embodiment 1
[0017] (1) Weigh 20g of Bayer process red mud, place it in a 100mL beaker, add 70mL of distilled water to wash, stir thoroughly for 30min, filter the supernatant, repeat the above cleaning steps twice, and finally wash the red mud at 60 Dry at ℃ for later use;
[0018] (2) With analytically pure concentrated sulfuric acid, configure 50 mL of 0.5 mol / L sulfuric acid solution for use;
[0019] (3) Weigh 5 g of red mud from step (1) and 40 mL of sulfuric acid solution from step (2) respectively, place them in a planetary ball mill, and mill for 8 hours. Adjust the pH of the red mud slurry after ball milling to 8 with ammonia water and stir it thoroughly for 30 minutes. After standing for 1 hour, pour off the turbid liquid, wash with 5% ammonia water for several times until neutral, then put the red mud into a drying oven, and dry it at 60°C for use;
[0020] (4) Weigh 5g of red mud from step (3) and mix with 1g of 200 mesh carbon powder evenly, add 5mL of sodium alginate solutio...
Embodiment 2
[0029](1) Weigh 20g of Bayer process red mud, place it in a 100mL beaker, add 70mL of distilled water to wash, stir thoroughly for 30min, filter the supernatant, repeat the above cleaning steps twice, and finally wash the red mud at 70 Dry at ℃ for later use;
[0030] (2) With analytically pure concentrated sulfuric acid, configure 50 mL of 0.5 mol / L sulfuric acid solution for use;
[0031] (3) Weigh 10 g of red mud from step (1) and 40 mL of sulfuric acid solution from step (2), place them in a planetary ball mill, and mill for 10 hours. Adjust the pH of the red mud slurry after ball milling to 8.5 with ammonia water, and stir it thoroughly for 30 minutes. After standing for 1 hour, pour off the turbid liquid, and then wash it several times with 8% ammonia water to neutrality, then put the red mud in a drying oven, and dry it at 70°C for use;
[0032] (4) Weigh 8g of red mud from step (3) and mix with 2g of 200 mesh carbon powder evenly, add 8mL of sodium alginate solution w...
Embodiment 3
[0040] (1) Weigh 20g of Bayer process red mud, place it in a 100mL beaker, add 70mL of distilled water to wash, stir thoroughly for 30min, filter the supernatant, repeat the above cleaning steps twice, and finally wash the red mud at 80 Dry at ℃ for later use;
[0041] (2) With analytically pure concentrated sulfuric acid, configure 50 mL of 0.5 mol / L sulfuric acid solution for use;
[0042] (3) Weigh 15g of red mud from step (1) and 40mL of sulfuric acid solution from step (2), place them in a planetary ball mill, mill for 12 hours, adjust the pH of the red mud after ball milling to 9 with ammonia water, and stir it thoroughly for 30 minutes. After standing for 1 hour, pour off the turbid liquid, and wash it several times with 10% ammonia water to neutrality, then put the red mud in a drying oven, and dry it at 80°C for use;
[0043] (4) Weigh 10g of red mud from step (3) and mix with 3g of 200 mesh carbon powder evenly, add 10mL of sodium alginate solution with a mass conce...
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