Method for modifying natural zeolite powder

A natural zeolite and zeolite powder technology, applied in chemical instruments and methods, silicates, inorganic chemistry, etc., can solve the problems of unsatisfactory removal of ammonia nitrogen, unsuitable drinking water treatment, and reduced efficiency of ammonia removal, etc., to save preparation Time and energy consumption, improved adsorption performance, good modification effect

Inactive Publication Date: 2009-11-04
JINAN UNIVERSITY
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  • Application Information

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Problems solved by technology

[0003] At present, the methods for treating ammonia in water mainly include air stripping, nitrification and denitrification, breakpoint chlorination, and ion exchange, etc., each of which has its own advantages and disadvantages: although air stripping treatment is an effective method for removing ammonia, but the method For low-temperature water, the efficiency of ammonia removal is significantly reduced, and this method is only suitable for treating sewage with high concentration of ammonia nitrogen under strong alkalinity and high-temperature heating, and is not suitable for drinking water treatment; nitrification and denitrification ammonia removal technology is only suitable It is used to treat medium and high concentrations of ammonia nitrogen in wastewater by biochemical methods, but the effect of treating low concentrations of ammonia in slightly polluted water is not obvious, and the traditional drinking water treatment process needs to be changed, and the cost is high; the method of adding chl

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1 Modified zeolite powder

[0029] The specific preparation steps of the modified zeolite powder of this embodiment are as follows:

[0030] (1) Pretreatment: Take natural zeolite powder, wash it with water several times to remove soluble impurities, and dry it at 104°C for 4.0 hours;

[0031] (2) Modification treatment: According to the mass ratio of zeolite powder: sodium chloride = 1:1, the natural zeolite powder and sodium chloride after the pretreatment are mixed and put into the alkali-resistant reactor, and then added to the reactor Add 1.0mol / L sodium hydroxide solution, so that the sodium hydroxide solution is immersed in natural zeolite powder and sodium chloride, then after 30 hours, rinse with water to neutrality, and then dry at 104℃ for another 5.0 hours to make modified Zeolite powder.

Example Embodiment

[0032] Example 2 Modified zeolite powder

[0033] The specific preparation steps of the modified zeolite powder of this embodiment are as follows:

[0034] (1) Pretreatment: Take natural zeolite powder, wash it several times with water to remove soluble impurities, and dry it at 50°C for 2.0 hours;

[0035] (2) Modification treatment: According to the mass ratio of zeolite powder: sodium chloride=50:1, the natural zeolite powder and sodium chloride after the pretreatment are mixed and put into the alkali-resistant reactor, and then into the reactor Add 5mol / L sodium hydroxide solution so that the sodium hydroxide solution is immersed in natural zeolite powder and sodium chloride, then after 5 hours, rinse with water to neutrality, and then dry at 50℃ for another 1.0 hour to make modified zeolite powder.

Example Embodiment

[0036] Example 3 Adsorption performance of modified zeolite powder

[0037] In this example, the modified zeolite powder prepared in Example 1 was selected to compare the adsorption performance with other zeolite powder prepared by hydrogen type modification treatment, alkaline modification treatment, sodium type modification treatment and double modification treatment.

[0038] This embodiment is divided into the following six experimental groups:

[0039] 1. Natural zeolite: commercially available natural zeolite powder produced in Xinyang, Henan, with a particle size range of 50-800 mesh;

[0040] 2. Modified zeolite: prepared in Example 1;

[0041]3. Hydrogen zeolite: add the above natural zeolite to 1.0mol / L hydrochloric acid solution and shake for 12 hours, rinse with water until the pH value is neutral, and dry at 104°C for 5.0 hours to prepare hydrogen zeolite;

[0042] 4. Alkaline zeolite: add the above natural zeolite powder to 1.0mol / L sodium hydroxide solution and shak...

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Abstract

The invention discloses a method for modifying natural zeolite powder, which uses an inorganic alkali and sodium chloride as modification medicaments to modify the natural zeolite powder by a solution soaking method. The method comprises the following steps: firstly, mixing the natural zeolite powder and the sodium chloride, soaking the mixture in sodium hydroxide solution for an adsorption reaction, washing the product of the absorption reaction with water till the pH value of the product is neutral after the reaction is finished; and secondly, drying the product of the absorption reaction to obtain modified zeolite powder. The modification method of the invention avoids the use of organic acids and the production of toxic and harmful substances, effectively prevents low-concentration ammonian pollution of the raw water of drinking water without changing the prior drinking water treatment process, does not change the pH value of the raw water after being used, does not exert influence on the subsequent processes, and improves the ammonian adsorption performance of the modified zeolite powder by 30 to 80 percent.

Description

technical field [0001] The invention belongs to the field of environmental chemical industry, and in particular relates to a modification method of natural zeolite powder. Background technique [0002] At present, the pollution of surface water in our country is serious, and most drinking water sources are polluted by ammonia nitrogen. Many countries in the world have strictly limited the content of ammonia in drinking water standards, and the treatment technology of ammonia in water has also attracted people's attention. [0003] At present, the methods for treating ammonia in water mainly include air stripping, nitrification and denitrification, breakpoint chlorination, and ion exchange, etc., each of which has its own advantages and disadvantages: although air stripping treatment is an effective method for removing ammonia, but the method For low-temperature water, the efficiency of ammonia removal is significantly reduced, and this method is only suitable for treating se...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/32C02F1/28
Inventor 李明玉林达红朱丰华任刚唐启红
Owner JINAN UNIVERSITY
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