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Method for preparing expanded vermiculite adsorbent

A technology of expanded vermiculite and adsorbent, applied in chemical instruments and methods, silicate, inorganic chemistry, etc., can solve the problems of difficulty and high cost of heavy metal mercury treatment, achieve enhanced adsorption performance, increase active adsorption sites, Effect of improving physical and chemical properties

Inactive Publication Date: 2015-07-01
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method of expanded vermiculite adsorbent, which can solve the problem of high cost and difficulty in the treatment of heavy metal mercury in existing industrial emissions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The concrete method that the present invention prepares expanded vermiculite adsorbent comprises:

[0016] Select raw vermiculite with a good sheet structure, a particle size of 0.5-2.0cm, and a thickness of 0.05-0.25, wash it, dry it, and then conduct microwave treatment at a frequency of 800-3000MHZ for 1-3min, and finally crush and sieve Obtain the expanded vermiculite after microwave treatment to 60-250 mesh; In the present embodiment, make the expansion multiple of vermiculite be 26.831 by microwave treatment method, make the expansion multiple of vermiculite larger than existing calcining method, (present There is a muffle calcination method that makes the expansion factor of vermiculite only 19.270).

[0017] or;

[0018] Choose good lamellar structure, particle diameter at 0.5-2.0cm, the former vermiculite that thickness is 0.05-0.25, clean, dry, then carry out chemical expansion by the hydrogen peroxide of 10-30% concentration (in this embodiment Preferably, ...

Embodiment 2

[0026] Crush the expanded vermiculite that has been microwaved for 3 minutes at a frequency of 800MHZ to 200 mesh, add it to a 2mol / L hydrochloric acid solution at a solid-to-liquid ratio of 1:20, stir at 60°C for 2 hours, let stand naturally at room temperature for 3 hours, and filter with suction 1. Wash until neutral, dry at 105°C to constant weight, and grind to 200 mesh to obtain hydrochloric acid modified microwave expanded vermiculite powder. Take 0.5g sample for adsorption test at 5°C and saturated mercury vapor concentration, the adsorption amount of gaseous mercury is 36.2337mg / g.

[0027] Crush the expanded vermiculite that has been microwaved for 3 minutes at a frequency of 900-950MHZ to 200 mesh, add it to a 2mol / L hydrochloric acid solution at a solid-to-liquid ratio of 1:20, stir at 60°C for 2 hours, and let it stand naturally at room temperature for 3 hours. Suction filtration, washing to neutrality, drying at 105°C, grinding to 200 mesh to obtain hydrochloric ...

Embodiment 3

[0032] The selected raw vermiculite is subjected to chemical expansion treatment in a hot hydrogen peroxide solution with a concentration of 10%, and then the expanded vermiculite treated with microwaves for 3 minutes at a frequency of 800-3000MHZ is pulverized to 200 mesh, according to a solid-to-liquid ratio of 1: 20 was added to 4mol / L hydrochloric acid solution, stirred at 60°C for 2h, left to stand naturally at room temperature for 3h, suction filtered, washed until neutral, dried at 105°C, and ground to 200 mesh to obtain hydrochloric acid modified microwave expanded leech stone powder. Take 0.5g sample to conduct adsorption test at 5°C and saturated mercury vapor concentration, the adsorption amount of gaseous mercury is 36.292mg / g.

[0033] The selected raw vermiculite is subjected to chemical expansion treatment in a hot hydrogen peroxide solution with a concentration of 25%, and then the expanded vermiculite treated with microwaves for 3 minutes at a frequency of 800...

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Abstract

The invention provides a method for preparing an expanded vermiculite adsorbent. The problem that the heavy metal mercury treatment is high in cost and high in difficulty in the conventional industrial emission is solved. The preparation method comprises the following steps: mixing expanded vermiculite of 60-250 meshes in a 0.5-6mol / L acidic solution under the stirring condition according to a ratio of 1 to (5-25); stirring under the condition of 20-100 DEG C for 90-130 minutes to obtain a stirred mixed solution; and standing the stirred mixed solution at room temperature for 1-9 hours, performing suction filtration, washing until the pH value is 6-7 preferably, and finally, performing drying treatment, thereby obtaining the expanded vermiculite adsorbent subjected to acid modification. With the adoption of the expanded vermiculite adsorbent prepared by adopting the method disclosed by the invention, the problem that the heavy metal mercury treatment is high in cost and high in difficulty in the conventional industrial emission can be solved.

Description

technical field [0001] The invention belongs to the technical field of chemical adsorbent preparation, in particular to a preparation method of expanded vermiculite adsorbent. Background technique [0002] With the development of industrial technology, the amount of heavy metals produced by combustion in industrial production is increasing. Among them, heavy metal mercury as one of the pollutants accounts for 67.8%-82.2% of the emissions. Heavy metal mercury and its compounds have a strong Toxicity, and can be continuously enriched in organisms through the food chain, therefore, the removal of elemental mercury in coal combustion flue gas is of great significance to prevent mercury pollution. At present, activated carbon is generally used as an adsorbent to adsorb heavy metals in industrial production, but the cost of this method is high, which is difficult for ordinary industrial merchants to bear. [0003] Vermiculite is a resource-rich, natural and non-toxic mineral. It ...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/30
Inventor 王蒙蒙但建明李洪玲齐誉
Owner SHIHEZI UNIVERSITY
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