A kind of preparation method of granular red mud-based adsorbent for phosphate adsorption
A technology of adsorbent and red mud, which is applied in the field of environmental management, can solve the problems of unsuitable for large-scale promotion and application, low strength and porosity of ceramic adsorbent, poor adsorption performance, etc., achieve good phosphate adsorption capacity, and solve the problem of phosphoric acid The effect of salt recovery and convenient material collection
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Embodiment 1
[0032] (1) Take a certain amount of raw red mud, mix it with the calcium and magnesium ion solution at a weight ratio of 1:5, and stir continuously until the pH reaches 8.4;
[0033] (2) Separating the above-mentioned red mud mixture with calcium and magnesium ions into solid and liquid, and washing the solid sample with deionized water for several times until the pH of the filtrate is neutral, and then drying the solid sample at 100° C. for 12 hours;
[0034] (3) Grinding and sieving the dried sample after natural cooling to obtain neutralized red mud with a particle size of 100 μm;
[0035] (4) Add the neutralized red mud to the hydrochloric acid solution of 10.0mol / L at the dosage of 0.5g / L, and react at 40°C for 5h;
[0036] (5) Separating the above red mud mixed with hydrochloric acid solution into solid and liquid, and washing the solid sample with deionized water for several times until the pH of the filtrate is neutral, then drying the solid sample at 100°C for 12 hour...
Embodiment 2
[0045] Prepare a phosphate solution with an initial concentration of 500 mg / L and an initial pH of 7.0, add the red mud particles prepared in Example 1, and stir at 100 rpm for 48 hours at a temperature of 40°C. The results obtained are as follows: the specific surface area and total pore volume of the red mud particles are 113.54m 2 / g and 0.0287cm 3 / g. The phosphate adsorption capacity of unit particle red mud-based adsorbent reached 84.56mg / g.
Embodiment 3
[0047] (1) Take a certain amount of raw red mud, mix it with the calcium and magnesium ion solution at a weight ratio of 1:5, and stir continuously until the pH reaches 8.4;
[0048] (2) Separating the above-mentioned red mud mixture with calcium and magnesium ions into solid and liquid, and washing the solid sample with deionized water for several times until the pH of the filtrate is neutral, and then drying the solid sample at 100° C. for 12 hours;
[0049] (3) Grinding and sieving the dried sample after natural cooling to obtain neutralized red mud with a particle size of 100 μm;
[0050] (4) Add the neutralized red mud to the hydrochloric acid solution of 10.0mol / L at the dosage of 0.5g / L, and react at 40°C for 5h;
[0051] (5) Separating the above red mud mixed with hydrochloric acid solution into solid and liquid, and washing the solid sample with deionized water for several times until the pH of the filtrate is neutral, then drying the solid sample at 100°C for 12 hour...
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