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Natural zeolite adsorption microspheres as well as preparation method and application thereof

A technology of natural zeolite and adsorption microspheres, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem of environmental protection and sustainable development strategy, reduce zeolite ammonia nitrogen removal rate, increase energy consumption, etc. problems, to achieve good ammonia nitrogen adsorption performance, good water environment stability, and easy control of the operation process

Pending Publication Date: 2022-03-18
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the methods of preparing microspheres mainly include polymerization method and powder bonding into ball method. The polymerization method needs to use more expensive chemical reagents. Compared with natural minerals, the cost is higher, so natural mineral powder is used to bond into balls. The method is the main method for industrial production of microspheres, but when the powder bonding method is used, there is an uneven interface between the component powders. In order to eliminate the interface and improve the stability of the microspheres, high-temperature sintering is required. Therefore, In the preparation of natural zeolite-based adsorption balls, high-temperature calcination is usually required to enhance its stability. For example, patents with publication numbers [CN104492404A], [CN107096498A], [CN103028370A], and [CN112108110A] all require high temperature ( 400~800℃) sintering step, in general, calcination at high temperature will destroy the crystal structure of zeolite and reduce the ammonia nitrogen removal rate of zeolite [4] , and will increase energy consumption, which is not in line with the country's environmental protection and sustainable development strategy

Method used

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  • Natural zeolite adsorption microspheres as well as preparation method and application thereof
  • Natural zeolite adsorption microspheres as well as preparation method and application thereof
  • Natural zeolite adsorption microspheres as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this example, natural zeolite adsorption microspheres were prepared with different binder dosages.

[0029] like figure 1 As shown, the natural zeolite is pulverized with a high-speed pulverizer and then sieved with a 200-mesh sieve for subsequent use. After pulverizing the natural bentonite with a high-speed pulverizer, add deionized water with a solid-to-liquid ratio of 1:10, and add sodium hexametaphosphate with a mass fraction of 0.3% and sodium carbonate with a mass fraction of 4%, mix and stir for 2 hours and let stand 1h, take the supernatant after standing still and centrifuge at 8000rpm for 3min, wash twice and then dry, crush the dried ore sample with a high-speed pulverizer and pass through a 200-mesh sieve to obtain sodium bentonite for later use. After fully mixing natural zeolite and sodium bentonite in a ratio of 7:3, add water glass solution with a mass fraction of 40% and an appropriate amount of water, mixed thoroughly and then granulated, dried t...

Embodiment 2

[0031] In this example, natural zeolite adsorption microspheres were prepared with different ratios of natural zeolite and sodium bentonite.

[0032]The natural zeolite is pulverized with a high-speed pulverizer and then sieved with a 200-mesh sieve for subsequent use. After pulverizing the natural bentonite with a high-speed pulverizer, add deionized water with a solid-to-liquid ratio of 1:10, and add sodium hexametaphosphate with a mass fraction of 0.3% and sodium carbonate with a mass fraction of 4%, mix and stir for 2 hours and let stand 1h, take the supernatant after standing still and centrifuge at 8000rpm for 3min, wash twice and then dry, crush the dried ore sample with a high-speed pulverizer and pass through a 200-mesh sieve to obtain sodium bentonite for later use. Fully mix natural zeolite and sodium bentonite in the ratio of 5:5, 6:4, 7:3, 8:2, 9:1 (Example 2.1, 2.2, 2.3, 2.4, 2.5) and mix at 40mL / 100g The dosage of the ore sample is to add water glass solution w...

Embodiment 3

[0034] In this example, natural zeolite adsorption microspheres were prepared by impregnating different concentrations of PVA.

[0035] The natural zeolite is pulverized with a high-speed pulverizer and then sieved with a 200-mesh sieve for subsequent use. After pulverizing the natural bentonite with a high-speed pulverizer, add deionized water with a solid-to-liquid ratio of 1:10, and add sodium hexametaphosphate with a mass fraction of 0.3% and sodium carbonate with a mass fraction of 4%, mix and stir for 2 hours and let stand 1h, take the supernatant after standing still and centrifuge at 8000rpm for 3min, wash twice and then dry, crush the dried ore sample with a high-speed pulverizer and pass through a 200-mesh sieve to obtain sodium bentonite for later use. Fully mix natural zeolite and sodium bentonite at a ratio of 7:3, then add water glass solution with a mass fraction of 40% and an appropriate amount of water according to the amount of 40mL / 100g mixed ore sample, mix...

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Abstract

The invention discloses a natural zeolite adsorption microsphere as well as a preparation method and application thereof. The natural zeolite adsorption microsphere comprises a microsphere and a polyvinyl alcohol film coated on the surface of the microsphere, and the microsphere is prepared by mixing natural zeolite, sodium bentonite, water glass and water. The preparation method of the natural zeolite adsorption microspheres comprises the following steps: S1, uniformly mixing natural zeolite and sodium bentonite, adding water glass and water to prepare microspheres, and drying and aging the microspheres; s2, impregnating the dried and aged microspheres with a polyvinyl alcohol solution, and then drying to obtain the natural zeolite adsorption microspheres. The natural zeolite adsorption microspheres provided by the invention have good ammonia nitrogen adsorption performance and water environment stability, the removal efficiency of ammonia nitrogen in a water body can reach 85-95%, the adsorption effect is stable, the stable existence time in the water is 10 days or more, and meanwhile, the natural zeolite adsorption microspheres have good adsorption performance within the pH range of 3-7.

Description

technical field [0001] The invention relates to the technical field of adsorption materials, in particular to a natural zeolite adsorption microsphere and its preparation method and application. Background technique [0002] Landfill leachate is a high-concentration ammonia-nitrogen waste liquid formed after surface water and rainwater soak landfills and waste treatment stations. Hazardous atmosphere. High concentrations (>0.5mmol / L) of ammonia nitrogen will stimulate plankton and cause serious impact on the water environment. Moreover, ammonia and its salts are toxic to humans, fish, and crustaceans. When excessive ammonia accumulates in the blood of fish, it will kill them, which threatens the development of ecosystems and fisheries around the world. Therefore, effective treatment of landfill leachate is a key issue that needs to be solved urgently. [0003] At present, the main methods of treating ammonia nitrogen waste liquid are adsorption method, catalytic method...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/16
CPCB01J20/265B01J20/186B01J20/28016C02F1/281C02F2101/16
Inventor 赵啟行龙晨晖杨华明
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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