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A method for preparing zeolite phosphorus-fixing agent from fly ash and products prepared by the method

A technology of zeolite phosphorus-fixing agent and fly ash, which is applied in chemical instruments and methods, cation exchange, water/sludge/sewage treatment, etc., can solve the problem of unsatisfactory phosphorus removal effect, etc. Effect

Active Publication Date: 2016-06-01
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The document "Research on Phosphorus Fixation Mechanism of Fly Ash Synthetic Zeolite and Phosphorus Fixation Ability Enhancement Technology" (Shanghai Jiaotong University Doctoral Dissertation, Chen Jiangang, 2007) disclosed that 15 kinds of fly ash were synthesized by hydrothermal synthesis of fly ash P zeolite method, and impregnate and saturate the obtained fly ash P zeolite with calcium salt saturated solution and iron salt saturated solution to improve its phosphorus removal ability, but in practical applications, the fly ash zeolite obtained by this technology is not suitable for phosphorus-containing sewage Phosphorus removal effect is not satisfactory

Method used

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  • A method for preparing zeolite phosphorus-fixing agent from fly ash and products prepared by the method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Weigh 1500 grams of 200-mesh fly ash, 500 grams of quartz sand mixture and 0.5mol / L sodium hydroxide solution, the liquid-solid ratio is 5:1, add it into a stainless steel crystallization kettle, stir and react for 2 hours, place it in an oven, 90 The reaction was carried out at ℃ for 12 hours, and the obtained product was dried at 105 ℃, ground, and sieved with 200 mesh to obtain P zeolite.

[0031] The obtained P zeolite was soaked in a calcium chloride solution with a molar concentration of 0.1 mol / L for 48 hours, washed with water until neutral, and dried to obtain a zeolite phosphorus fixative. The zeolite phosphorus-fixing agent has a significant effect on phosphorus removal in alkaline phosphorus-containing sewage, and the results of the phosphorus removal experiment are shown in Table 1.

Embodiment 2

[0033] The P zeolite obtained in Example 1 was taken and immersed in a calcium chloride solution with a molar concentration of 0.05 mol / L for 72 hours, washed with water until neutral, and dried to obtain a zeolite phosphorus fixative. The zeolite phosphorus-fixing agent has a significant effect on phosphorus removal in alkaline phosphorus-containing sewage, and the results of the phosphorus removal experiment are shown in Table 1.

Embodiment 3

[0035] The P zeolite obtained in Example 1 was taken and immersed in a ferric sulfate solution with a molar concentration of 0.05 mol / L for 48 hours, washed with water until neutral, and dried to obtain a zeolite phosphorus fixative. The zeolite phosphorus-fixing agent has a significant effect on phosphorus removal in acidic phosphorus-containing sewage. The results of the phosphorus removal experiment are shown in Table 1.

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Abstract

The invention discloses a method for preparing zeolite phosphorus fixation agent from coal ash. The method comprises the following steps: synthesizing P zeolite by coal ash; impregnating the P zeolite by adopting a calcium salt solution, a ferric salt solution or a ferrite salt solution, wherein the concentration of a calcium ion in the calcium salt solution, a ferric ion of the ferric salt solution and a ferrous ion of the ferrite salt solution is 0.05-0.1mol / L; washing the impregnated P zeolite, and drying, thereby obtaining the zeolite phosphorus fixation agent. The invention also provides the zeolite phosphorus fixation agent prepared from coal ash by the method. The zeolite phosphorus fixation agent from coal ash, which is prepared by the invention, has an excellent phosphorus removing effect.

Description

technical field [0001] The invention relates to a method for preparing a zeolite phosphorus fixing agent and a product prepared by the method. Background technique [0002] Zeolite synthesized from fly ash is a material with cation exchange properties, and is generally synthesized from fly ash by hydrothermal synthesis. The liquid-solid ratio is reacted in a high-pressure vessel, and then obtained by drying, grinding and sieving. Fly ash synthetic zeolite can be impregnated with calcium salt and iron salt solution to improve its phosphorus removal ability. [0003] The document "Research on Phosphorus Fixation Mechanism of Fly Ash Synthetic Zeolite and Phosphorus Fixation Ability Enhancement Technology" (Shanghai Jiaotong University Doctoral Dissertation, Chen Jiangang, 2007) disclosed that 15 kinds of fly ash were synthesized by hydrothermal synthesis of fly ash P zeolite method, and impregnate and saturate the obtained fly ash P zeolite with calcium salt saturated soluti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J39/14C02F1/42C02F1/58
Inventor 李超徐会军王强房现阁杜艳霞凌文郭昭华张晓煜
Owner CHINA SHENHUA ENERGY CO LTD