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Method for synthesizing zeolite by fly ash and application thereof

A technology for synthesizing zeolite and fly ash, which is applied in chemical instruments and methods, other chemical processes, adsorption water/sewage treatment, etc., can solve the problems of low operating cost and investment cost, and achieve labor saving, regeneration frequency reduction, The effect of low investment cost

Inactive Publication Date: 2005-06-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to aim at the deficiencies in the prior art, propose a kind of preparation method of fly ash synthetic zeolite and the method for synchronously removing nitrogen and phosphorus in sewage by using fly ash synthetic zeolite, adopt lower operation cost and investment cost, solve Environmental problems caused by fly ash solid waste and nitrogen and phosphorus nutrient pollutants in sewage, and at the same time realize the resource utilization of fly ash and nitrogen and phosphorus in sewage

Method used

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  • Method for synthesizing zeolite by fly ash and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The solid waste fly ash remaining after coal combustion is used as raw material, and sodium silicate and table salt are added as ingredients, wherein the sodium silicate is 20% of the weight of the fly ash, and the table salt is 40% of the weight of the fly ash. Take 1M (molar concentration) NaOH solution, mix it with the fly ash after adding ingredients at a liquid-solid ratio of 6, react at a temperature of 95°C for 24 hours, and then dry the solid phase after solid-liquid separation to obtain pulverized coal Ash synthetic zeolite. Then the fly ash was synthesized into zeolite for activation, using 0.5M CaCl 2 solution, mixed with fly ash zeolite at a ratio of liquid to solid of 5, and then separated from solid and liquid after saturation treatment, washed away unadsorbed salts, dried, and converted into calcium type that has adsorption activity for nitrogen and phosphorus in sewage Synthetic zeolite from fly ash.

[0028] The transformed and activated fly ash synth...

Embodiment 2

[0030] Sodium silicate and sodium fluoride are added to the fly ash, the sodium silicate is 5% of the weight of the fly ash, and the sodium fluoride is 20% of the weight of the fly ash. Take 2M (molar concentration) NaOH solution, mix it with the fly ash after adding ingredients according to the ratio of liquid to solid ratio of 10, react at a temperature of 120°C for 24 hours, and then dry the solid phase after solid-liquid separation to obtain powdered coal gray zeolite. Then the fly ash synthetic zeolite transformation is activated, using 0.5M (molar concentration) CaCl 2 solution, mixed with fly ash zeolite at a ratio of liquid to solid of 8, separated from solid and liquid after multiple saturation treatments, washed off unadsorbed salts, dried, and converted into nitrogen and phosphorus in sewage. Synthetic zeolites from calcium-saturated fly ash.

[0031] The transformed and activated fly ash synthetic zeolite is pressed into 8mm particles, dried and packed in a filte...

Embodiment 3

[0033] Metal aluminum foil and sodium chloride are added to the fly ash, wherein the aluminum foil is 5% of the weight of the fly ash, and the sodium chloride is 30% of the weight of the fly ash. The metal alkali solution takes 1M (molar concentration) NaOH solution, mixes it with the fly ash after adding the ingredients according to the ratio of liquid-solid ratio of 5, reacts at a temperature of 95 ° C for 16 hours, and then dries the solid phase after solid-liquid separation. Get fly ash zeolite. Then the fly ash is synthesized into zeolite for activation, using 0.5M (molar concentration) FeCl 3 solution, mixed with fly ash zeolite at a ratio of liquid to solid of 8, and then separated from solid and liquid after saturation treatment, washed away unadsorbed salts, dried, and converted into calcium saturated with adsorption activity for nitrogen and phosphorus in sewage Synthetic zeolite from fly ash.

[0034] The activated fly ash synthetic zeolite is directly added to th...

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Abstract

The invention concerns a way of synthesize stone using coal powder and its applying in removing nitrogen and phosphorus in the waste water. Get the coal powder as the material, add the material including aluminum, silicon, or fluorine which can saluted in the alkaline solution, after mixing, add metal alkaline solution and synthesize fei stone by water heating reaction, then change shape by metal salt aqua, we get the fei stone after separating solid and liquid. Change the fei stone to the grains and put them in the filtering bed, achieving to remove nitrogen and phosphorus. The invention solves the environment problem, economy the resource of nitrogen and phosphorus in the coal powder, no second pollution.

Description

technical field [0001] The invention relates to a preparation method of fly ash synthetic zeolite and an advanced treatment method for synchronous denitrification and phosphorus removal of sewage by using fly ash synthetic zeolite, belonging to the technical field of environmental protection. Background technique [0002] The shortage of water resources and serious water pollution have become important factors affecting the sustainable development of my country's national economy. Among them, eutrophication has become one of the most serious pollutions of water bodies in my country, especially urban water bodies. Measures must be taken for prevention and comprehensive treatment in order to improve the water environment. At present, the secondary treatment rate of urban sewage in my country is constantly increasing. However, secondary sewage treatment alone cannot remove nitrogen and phosphorus nutrients that lead to eutrophication of water bodies. In order to prevent and c...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30C02F1/28
Inventor 吴德意孔海南何圣兵
Owner SHANGHAI JIAO TONG UNIV
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