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Method for preparing fly ash fluorine removal agent through two steps of hydrothermal reaction/acid leaching and application

A technology of fly ash and fluoride removal agent, which is applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of secondary pollution, difficult to obtain, and high cost of raw materials, and achieve convenient treatment, Reduced preparation cost and large adsorption capacity

Active Publication Date: 2018-08-21
XILINGOL VOCATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, the raw materials used as defluoridation agents mainly include alumina, brick red soil, hybrid materials of anion exchange resin and metal aluminum, lithium, zeolite molecular sieve, etc. These raw materials are expensive or difficult to obtain, and the adsorption process even causes secondary pollution. Pollution

Method used

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  • Method for preparing fly ash fluorine removal agent through two steps of hydrothermal reaction/acid leaching and application
  • Method for preparing fly ash fluorine removal agent through two steps of hydrothermal reaction/acid leaching and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of hydrothermal / acid leaching two steps prepares the method for fly ash defluorination agent, comprises the following steps:

[0042] Put a certain amount of fly ash and 0.1, 1.5, 2.5mol / L NaOH solution into the autoclave at a solid-to-liquid ratio of 1:10, and react for 4 hours at a temperature of 180°C and a stirring speed of 350rpm. Then pulp washing and suction filtration. With 1.5mol / L of H 2 SO 4 The solution was stirred and soaked for 5 minutes at a solid-to-liquid ratio of 1:10, then suction filtered, and dried at 80°C for 2 hours to make a fly ash defluorination agent.

[0043] The fluoride ion adsorption capacity test was carried out with the defluorinating agent made in Example 1, and the results are shown in Table 1.

[0044] Table 1 Example 1 performance comparison of each sample

[0045] sample number

[0046] It can be seen from the data in Table 1 that when the alkali water is hot, the adsorption rate of the fly ash defluoridation ag...

Embodiment 2

[0048] A kind of hydrothermal / acid leaching two steps prepares the method for fly ash defluorination agent, comprises the following steps:

[0049] Put the fly ash and 2.5mol / L NaOH solution into the autoclave at a solid-to-liquid ratio of 1:10, and react for 2 hours at a temperature of 180°C and a stirring speed of 350rpm. Then pulp washing and suction filtration. With 1.5mol / L of H 2 SO 4 Stir and soak with HCl solution at a solid-to-liquid ratio of 1:10, then soak with suction for 5 minutes, and then dry at 80°C and 120°C for 1 hour to make a fly ash defluorination agent.

[0050] The fluoride ion adsorption capacity test was carried out with the defluorinating agent made in Example 2, and the results are shown in Table 2.

[0051] Table 2 Example 2 performance comparison of each sample

[0052]

[0053]

[0054] It can be seen from the data in Table 2 that the defluoridation agent prepared by using sulfuric acid and hydrochloric acid as the pickling solution in t...

Embodiment 3

[0056] A kind of hydrothermal / acid leaching two steps prepares the method for fly ash defluorination agent, comprises the following steps:

[0057] Put fly ash and 2.5mol / L NaOH solution into the autoclave at a solid-to-liquid ratio of 1:10, and react for 2h and 4h at a temperature of 180°C and a stirring speed of 350rpm. Then pulp washing and suction filtration. With 1.5mol / L of H 2 SO 4 The solution was stirred at a solid-to-liquid ratio of 1:10 for 5 minutes, then filtered with suction, and dried at 120°C for 1 hour to prepare a fly ash defluorination agent.

[0058] The fluoride ion adsorption capacity test was carried out with the defluorinating agent made in Example 3, and the results are shown in Table 3.

[0059] Table 3 Example 3 performance comparison of each sample

[0060] sample number

[0061] It can be seen from the data in Table 3 that the effect of hydrothermal time on the adsorption effect of the defluorinating agent of the present invention is ...

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Abstract

The invention relates to the field of preparation of fluorine removal agents, in particular to a method for preparing a fly ash fluorine removal agent through two steps of hydrothermal reaction / acid leaching and an application. According to the method for preparing the fly ash fluorine removal agent through two steps of hydrothermal reaction / acid leaching, fly ash and an alkaline solution are mixed and subjected to a hydrothermal reaction at the temperature of 35-200 DEG C for 0.5-6 h, washing and suction filtration are performed, and a filter cake is formed; the filter cake is soaked in an acid solution or subjected to magnetic stirring treatment for 5-10 min, and then, suction filtration is performed; the filter cake subjected to acid treatment is dried, and the fly ash fluorine removalagent is obtained. The fluorine removal agent is a novel adsorbent with great prospects, can be widely used in the industries of fluorine-containing wastewater treatment and high-fluorine surface water purification, can be put in a proper container for use and can be subjected to one-time batch-type treatment, that is, the fluorine removal agent is added to high-fluorine water and stirred to adsorb fluorine ions, and the purpose of fluorine removal is achieved. In a word, the fluorine removal agent has various application methods and can be selected and used according to actual conditions.

Description

technical field [0001] The invention relates to the field of preparation of a defluorinating agent, in particular to a method and application of a two-step hydrothermal / acid leaching preparation of a fly ash defluorinating agent. Background technique [0002] Fluorine is one of the most abundant trace elements in the earth's crust, most of which exist in the silicate layer of the earth's crust. With the development of industry and mining industry, fluorine enters the human living environment from rocks through various channels, mainly infiltrating into soil and water, which has a serious impact on human health and life. Fluorine is one of the necessary chemical components in human bones and teeth. Appropriate amount of fluoride is beneficial to prevent dental caries, control the reproduction of bacteria in the oral cavity, calcify teeth and improve acid resistance. However, excessive fluorine can cause acute poisoning in humans, causing damage to the metabolic system, func...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/30C02F1/28C02F101/14
CPCB01J20/16B01J2220/4875C02F1/281C02F2101/14
Inventor 丁海萍侯泽健张怀宇
Owner XILINGOL VOCATIONAL COLLEGE
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