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Method for preparing gaseous mercury absorbing and purifying agent

A technology of elemental mercury and adsorbent, applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve the problems of low adsorption efficiency of elemental mercury and unsatisfactory mercury removal effect

Inactive Publication Date: 2008-11-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that the removal efficiency of mercury by calcium-based substances has a great relationship with the chemical form of mercury in flue gas, Ca(OH) 2 to HgCL 2 The adsorption efficiency can reach 85%, and the alkaline adsorbent containing CaO has a good effect on HgCL 2 The adsorption effect of calcium-based adsorbents is also very good, but the adsorption efficiency of calcium-based adsorbents for elemental mercury is very low
Therefore, the removal effect of mercury in coal-fired flue gas is not ideal.
At present, the research on calcium-based adsorbents is still in the laboratory research stage and has not been used in industrial practice.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The chemical composition weight percentage of vermiculite is: SiO 2 : 32.45%, Al 2 o 3 : 15.53%, Fe 2 o 3 23.85%, MgO 12.85%, CaO 2.28%, K 2 O 2.36%, H 2 O 10.68% after flotation to remove impurities, crushed and ground through a 120 mesh sieve. Weigh 2g of vermiculite and add 4.8ml of 4mol / L hydrochloric acid (≈1000g per liter) solution, stir evenly, let it stand for immersion and aging for 6 hours, then put it in a container and place it in a resistance furnace at 105℃~ Activate at 110°C for 20 hours, then take it out and grind it to <200 mesh, and put it in an electric resistance furnace to bake until the moisture content is <5wt% to obtain the product adsorbent.

Embodiment 2

[0022] After the vermiculite (chemical composition is the same as Example 1) was removed by flotation, it was dried and pulverized, and ground through a 120-mesh sieve. Weigh 2g of vermiculite and add it into 5.0ml of 2mol / L hydrochloric acid solution, stir evenly, let it stand for immersion and aging for 8 hours, then put it in a container and place it in a resistance furnace for activation at 110°C for 24 hours, then take out the mill Crushed to less than 200 mesh, placed again in the electric resistance furnace and baked for 2 hours to obtain the product adsorbent.

Embodiment 3

[0024] Adsorbent prepared by example 1, adsorption condition is mercury inlet concentration 72.59ug / m 3 , the particle size of the adsorbent is less than 200 mesh, and the reaction space velocity is 7000hr -1 , the adsorption temperature is 25°C-30°C, and the adsorption capacity is 5.5ug / g adsorbent, while the adsorption capacity of unmodified vermiculite raw soil is only 1.16ug / g under the same conditions.

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Abstract

The present invention relates to a preparation of an absorbent for absorbing and purifying the gaseous elementary mercury, which is made from the vermiculite which is modified by hydrochloric acid, namely, mixing 2-6 mol / L hydrochloric acid and the vermiculite as the solid-to-liquid ratio of 1:2-4,laying for 6-8 hours, putting the mixture into the mill furnace at the temperature of 105-110 degree C, activating for 20-24 hours, taking out and grinding to less than 200 meshes, drying in the mill furnace until the water ratio is less than 5%, and then the modified vermiculite adsorption is obtained. The absorption effect of the sorbent of the present invention is better than the active carbon for trace gaseity elementary mercury in the coom smoke gas or the other industrial tail gas. When purifying the tail gas containing elementary mercury less than 100ug / m<3>, the absorption capability of the elementary mercury can reach 3.2ug / g-6.0ug / g. The preparation of the present invention is especially used for occasions need to control mercury in the tail gas, such as coal-fired power plant, garbage incinerator and some chemical production factories.

Description

1. Technical field [0001] The invention relates to a gaseous elemental mercury pollution purification treatment technology. The invention belongs to the field of preparation of chemical adsorbents. 2. Background technology [0002] Mercury is a trace element in coal, but its possible environmental pollution is a matter of special concern. According to the latest data analysis of the United States Environmental Protection Agency and the United Nations, the global annual natural and man-made mercury emissions are about 4400-7500t, of which the US man-made mercury emissions account for about 3% of the global total mercury emissions (132-225t / yr), of which Mercury emissions from coal-fired power plants account for 1% of total global mercury emissions, or 33% (44-75t / yr) of anthropogenic mercury emissions in the United States. Mercury released from coal-fired boilers comes in three forms: elemental mercury (Hg 0 ), the oxidized state of mercury (Hg + and Hg 2+ ) and particul...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01D53/04B01D53/64
Inventor 马丽萍王建英宁平贺克雕杜亚雷
Owner KUNMING UNIV OF SCI & TECH
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