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Preparation method and application of fly ash defluorination agent

A technology of fly ash and fluoride removal agent, applied in chemical instruments and methods, other chemical processes, inorganic chemistry, etc., can solve problems such as limited application fields, uneven regional distribution, hidden dangers of ecological environment pollution, etc., and achieve good adsorption , High adsorption efficiency and large adsorption capacity

Inactive Publication Date: 2018-07-24
XILINGOL VOCATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In CN100593433C, brick red soil and aluminum salt are used as raw materials; in CN106975440A, kaolin and sodium hydroxide are used as raw materials; in CN105858783A, aluminum sulfate and sodium metaaluminate are used as raw materials to prepare defluorinating agent, and fly ash is not used as raw material to prepare defluorinating agent of
Moreover, my country has the characteristics of uneven regional distribution and limited application fields, which has brought serious ecological and environmental pollution hidden dangers, and it is urgent to find new ways to use fly ash in large quantities.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] A preparation method of fly ash defluorination agent, comprising the steps of:

[0026] (1) Ingredients: Fully mix fly ash and clay;

[0027] (2) Forming: add water, granulate, make ceramsite, and dry;

[0028] (3) Burning: Put the dried ceramsite into the kiln, raise the temperature to 200-300°C and keep it for 5-30 minutes, continue to heat up to 950-1150°C and keep it for 5-30 minutes, take it out after natural cooling;

[0029] (4) Activation: Soak the fired ceramsite in acid, alkali or salt solution, filter and dry to obtain fly ash defluorination agent.

[0030] In the present invention, the clay is used as a binder in the ceramsite, and the water is used for mixing with various raw materials to facilitate granulation. In the present invention, the granulation step can be granulated by using a disc granulator. In a specific embodiment of the present invention, the fly ash is from Inner Mongolia Xilin Gol League Power Plant, the sodium hydroxide is purchased fro...

Embodiment 1

[0039] A preparation method of fly ash defluorination agent, comprising the steps of:

[0040] (1) Ingredients: fully mix 400g of fly ash, 5g of sodium hydroxide, and 75g of clay;

[0041] (2) Molding: Add 50g of water, granulate with a disc granulator to make ceramsite with a particle size of 0.2-2cm, and place it in an oven at 40°C for drying;

[0042] (3) Burning: Put the dried ceramsite into the kiln, heat up to 300°C for 10 minutes, continue to heat up to 1150°C for 30 minutes, and take it out after natural cooling;

[0043] (4) Activation: The fired ceramsite was ultrasonically soaked in a hydrochloric acid solution with a liquid-solid ratio of 10.3M for 1 hour, filtered and dried in an oven at 100°C to obtain a fly ash defluorination agent.

[0044] Effect test method:

[0045] At room temperature, weigh 3g of fly ash defluorination agent and add it to a 50mL, 1000mg / L conical flask of fluorine-containing solution, place it in an oscillator and vibrate for 20min, test...

Embodiment 2

[0047] A preparation method of fly ash defluorination agent, comprising the steps of:

[0048] (1) Ingredients: fully mix 400g of fly ash and 75g of clay;

[0049] (2) Molding: Add 50g of water, granulate with a disc granulator to make ceramsite with a particle size of 0.2-2cm, and place it in an oven at 40°C for drying;

[0050] (3) Burning: Put the dried ceramsite into the kiln, heat up to 300°C for 10 minutes, continue to heat up to 1150°C for 30 minutes, and take it out after natural cooling;

[0051] (4) Activation: The fired ceramsite was ultrasonically soaked in a hydrochloric acid solution with a liquid-solid ratio of 10.3M for 1 hour, filtered and dried in an oven at 100°C to obtain a fly ash defluorination agent.

[0052] The effect testing method is the same as in Example 1.

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Abstract

The invention relates to the field of preparation of defluorination agents, and concretely relates to a preparation method and an application of a fly ash defluorination agent. The preparation methodof the fly ash defluorination agent comprises the following steps: fully mixing fly ash with clay; adding water, granulating the obtained mixture to prepare ceramsite, and drying the ceramsite; placing the dried ceramsite in a kiln, heating the kiln to 200-300 DEG C, keeping the temperature for 5-30 min, continuously heating the kiln to 950-1150 DEG C, keeping the temperature for 5-30 min, naturally cooling the obtained ceramsite, and taking out the ceramsite; and immersing the sintered ceramsite in an acid, alkali or salt solution, filtering the immersed ceramsite, and drying the filtered ceramsite to obtain the fly ash defluorination agent. The preparation method has the advantages of recycling of the industrial waste solid fly ash, low raw material cost and great social benefits. The fly ash defluorination agent has the advantages of good adsorptivity, high fluorine ion adsorption efficiency and large adsorption capacity. The fly ash defluorination agent can be used as an adsorbentfor a simple water treater, and can adsorb fluorine ions after being directly added to high-fluorine water and stirred.

Description

technical field [0001] The invention relates to the field of preparation of a fluoride-removing agent, in particular to a preparation method and application of a fly ash-removing agent. Background technique [0002] Fluorine is one of the essential trace elements for the human body, but excessive amounts can cause chronic fluorosis, cause symptoms of fluorosis such as bone fluorosis and dental fluorosis, and even lead to arteriosclerosis. Large areas of groundwater in Northwest my country have high fluoride content, about 2-3mg / L. Most of the agricultural and pastoral areas drink groundwater directly, and endemic fluorosis is seriously harmful. Improving the quality of drinking water in agricultural and pastoral areas has a great impact and far-reaching significance. [0003] The adsorption method is the most widely used method for defluoridation of drinking water due to its advantages of simple operation, stable effect, and economical feasibility. Commonly used fluorine r...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/14
CPCB01J20/041B01J20/08B01J20/103C02F1/281C02F2101/14
Inventor 石建萍张怀宇侯泽健
Owner XILINGOL VOCATIONAL COLLEGE
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