Method for preparing water body nitrogen and phosphorus removal oxygenation composite material from fly ash
A technology for denitrification and phosphorus removal and composite materials is applied in the fields of water treatment material preparation and water environment pollution control, achieving the effects of low cost, easy popularization and abundant raw materials
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Embodiment 1
[0032] Example 1 Fly ash alkali fusion-hydrothermal synthesis of zeolite
[0033] The fly ash used was taken from a thermal power plant, and its main components are shown in Table 1.
[0034] Table 1 Chemical composition of fly ash
[0035]
[0036] According to the regulations of "Fly Ash Used in Cement and Concrete" (GB / T 1596—2017), SiO in fly ash 2 , Al 2 o 3 and Fe 2 o 3 The total mass fraction of ≥ 70%, belongs to the F class, the sample is low calcium fly ash, with pozzolanic activity. Fly ash is synthesized into zeolite by the alkali fusion hydrothermal method according to the following steps:
[0037] In order to remove the mineral impurities in the fly ash which are unfavorable to the synthesis of zeolite, the fly ash is pretreated by pickling before synthesis. Mix fly ash with 0.5mol / L hydrochloric acid at a solid-to-liquid ratio of 1:20, pickle in a magnetically stirred water bath for 0.5h, the temperature of the water bath is 100°C, and the stirring rate...
Embodiment 2
[0038] Example 2 One-step hydrothermal synthesis of zeolite from fly ash and preparation of oxygen micro-nano bubble modified fly ash zeolite
[0039] The one-step hydrothermal method is used to synthesize fly ash into zeolite according to the following steps, and then modify the zeolite with oxygen micro-nano bubbles:
[0040] Take a certain amount of F-class fly ash from a thermal power plant, mix the fly ash with 2mol / L hydrochloric acid at a solid-to-liquid ratio of 1:4, pickle in a magnetic stirring water bath for 4 hours, and the temperature of the water bath is 50°C , stirring rate 200r / min. Afterwards, it was washed with deionized water until neutral, dried in an oven at 100°C for 10 hours, cooled to room temperature, ground through a 100-mesh sieve, and placed in a desiccator for later use. Take the pretreated fly ash and 8mol / L NaOH solution in a 1L round bottom flask according to the solid-liquid ratio of 1:1, adjust the silicon-aluminum ratio in the system with di...
Embodiment 3
[0042] Example 3 Preparation of Lanthanum Modified Nitrogen and Phosphorus Removal Materials by Fly Ash Alkali Fusion-Hydrothermal Synthesis of Zeolite
[0043] In this example, according to figure 2 In the process route shown, fly ash is synthesized into zeolite by alkali fusion-hydrothermal method, and then metal modification and oxygen micro-nano bubble modification are carried out on the zeolite, and finally oxygen micro-nano bubble composite lanthanum modified fly ash zeolite is produced. , the specific preparation steps are as follows:
[0044] Synthesis of zeolite from fly ash: Mix fly ash with 4mol / L hydrochloric acid at a solid-to-liquid ratio of 1:2, pickle in a magnetically stirred water bath for 0.5h, the temperature of the water bath is 60°C, and the stirring rate is 200r / min. Then wash with deionized water until neutral, dry at 120°C, grind through a 40-mesh sieve, and set aside. Take fly ash and KOH solids with a mass ratio of 1:2, mix them and pulverize them...
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