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Preparation method of functionalized fly ash and zeolite composite particles

A technology of composite particles and fly ash, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problem of unsuitable ammonia nitrogen and phosphate removal, low ion adsorption capacity, nitrogen and phosphorus The problem of strong single release is solved, and the effect of simple operation, wide application and simple equipment is achieved.

Inactive Publication Date: 2012-12-26
ZHEJIANG UNIV
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Problems solved by technology

[0005] However, fly ash has the disadvantages of poor selectivity to pollutants in sewage, and its own ion adsorption capacity is not high, resulting in large residual sludge.
After conventional physical, chemical, or physical chemical modification, the capacity of sewage fly ash to remove nitrogen and phosphorus has been improved to a certain extent, but it is undeniable that the improved fly ash water treatment technology still has large consumption and residual Technical bottlenecks such as a lot of sludge and strong secondary release of nitrogen and phosphorus are not suitable for the removal of ammonia nitrogen and phosphate in high-concentration livestock and poultry breeding wastewater

Method used

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  • Preparation method of functionalized fly ash and zeolite composite particles
  • Preparation method of functionalized fly ash and zeolite composite particles
  • Preparation method of functionalized fly ash and zeolite composite particles

Examples

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Embodiment 1

[0033] Take 20g and pulverize it into 60 mesh sample 1 fly ash (the composition of Si\Al is 1.93:1), bake it at 90°C for 12h, then add 0.96g of sodium hydroxide and 40g of water and mix evenly (according to the mass ratio, the fly ash : alkali metal: water=100: 4.8: 200), at a temperature of 60 ° C, a stirring speed of 100 rpm under the conditions of the reaction 5h; add sodium aluminate to make the total content of silicon and aluminum in the preliminary hydrothermal physical and chemical reaction product The molar ratio is 1.5:1, continue to react for 20h; dope calcium oxide 0.2g (according to mass ratio, fly ash: calcium oxide=100:1), continue to react for 2h. The reaction product is filtered to obtain sediment, and the sediment is washed with deionized water to reduce the pH of the sediment to 8-10. Dry at 85°C for 24 hours to obtain fly ash nano-zeolite composite particles. The XRD diffraction analysis of its mineral composition is shown in 1. The synthesized product has ...

Embodiment 2

[0035] Take 20g and pulverize it into 60 mesh sample 1 fly ash (the composition of Si\Al is 1.93:1), bake it at 90°C for 12h, then add 1.92g of potassium hydroxide and 40g of water and mix evenly (according to the mass ratio, the fly ash : Alkali metal: water=100: 9.6: 200), at a temperature of 120 ° C, a stirring speed of 100 rpm under the conditions of the reaction 15h; adding alumina to make the preliminary hydrothermal physical and chemical reaction product of the total content of silicon and aluminum The molar ratio is 1:1, and the reaction is continued for 85 hours; doped with 1 g of calcium hydroxide (according to the mass ratio, fly ash: calcium hydroxide=100:5), and the reaction is continued for 5 hours. The reaction product is filtered to obtain sediment, and the sediment is washed with deionized water to reduce the pH of the sediment to 8-10. Dry at 85° C. for 24 hours to obtain fly ash nano zeolite composite particles. As shown in Table 1, the cation exchange capa...

Embodiment 3

[0037] Take 20g and pulverize it into 60 mesh sample 1 fly ash (composition Si\Al is 1.93:1), bake at 90°C for 12h, then add 0.96g of sodium bicarbonate and 240g of water and mix evenly (according to mass ratio, fly ash : alkali metal: water=100: 4.8: 1200), at a temperature of 80 ° C, a stirring speed of 100 rpm under the conditions of the reaction 8h; adding aluminum hydroxide to make the preliminary hydrothermal physical and chemical reaction product of the total content of silicon and aluminum The molar ratio of the mixture was 1.2:1, and the reaction was continued for 48 hours; doped with 0.5 g of calcium chloride (according to the mass ratio, fly ash: calcium chloride=100:2.5), and the reaction was continued for 3 hours. The reaction product is filtered to obtain sediment, and the sediment is washed with deionized water to reduce the pH of the sediment to 8-10. Dry at 85° C. for 24 hours to obtain fly ash nano zeolite composite particles. As shown in Table 1, the cation...

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Abstract

The invention discloses a preparation method of functionalized fly ash and nano zeolite composite particles, comprising the following steps: uniformly mixing baked fly ash, base metal and water in proportion by weight of 100:(4.8-9.6):(200-1200), performing hydrothermal physical and chemical reaction firstly at the temperature of 60-120 DEG C for 5-15h, then adding silicon salt or aluminum salt to cause the molar ratio of the total content of silicon to the total content of aluminum in the initial hydrothermal physical and chemical reaction product to be (1-1.5):1; then continuing to perform hydrothermal physical and chemical reaction at the temperature of 60-120 DEG C for 20-85h to generate nano synthetic zeolite; blending in calcium salt and / or magnesium salt, continuing to perform hydrothermal physical and chemical reaction at the temperature of 60-120 DEG C for 2-5h, wherein the mass ratio of the blended calcium salt and / or magnesium salt to the fly ash in the first step is (1-5):100; and filtering the reaction product to obtain deposit, washing the deposit with deionized water until the pH of the deposit is 8-10, and drying the deposit to obtain the functionalized fly ash and zeolite composite particles. The functionalized fly ash and nano zeolite composite particles disclosed by invention can be applied to advanced treatment of nitrogen and phosphorus in high-concentration sewage.

Description

technical field [0001] The invention relates to a preparation method of functional fly ash nano-zeolite composite particles, which can be used for recycling and removing ammonia nitrogen and phosphorus in high-concentration sewage. Background technique [0002] Fly ash is the largest industrial solid waste in my country. The total amount of fly ash discharged by coal-fired power plants is increasing year by year, which has caused great pressure on my country's national economic construction and ecological environment. my country has decided to make the comprehensive utilization of fly ash the focus of solid waste utilization. Therefore, carrying out research on the comprehensive utilization of fly ash resources will not only improve the environment, solve the idle resources and occupied land, but also turn waste into wealth and create economic benefits. [0003] The shortage of water resources and serious pollution have become important factors affecting the sustainable dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/30C02F1/28C02F101/16
Inventor 张志剑陈晓燕
Owner ZHEJIANG UNIV
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