Formed mercury-removing material modified by transition metal selenide and preparation method thereof

A transition metal and transition metal salt technology, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve problems affecting the use value of fly ash concrete production raw materials, short contact time between adsorbent and flue gas, and secondary pollution. and other problems, to achieve the effects of excellent resistance to SO2 and H2O poisoning, reduction of secondary release pollution, and good mechanical properties

Active Publication Date: 2020-12-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Activated carbon injection (ACI) is currently a relatively mature flue gas mercury removal technology, but it still has some defects: (1) Due to the limited mercury adsorption capacity of activated carbon, in order to obtain a high mercury removal effect, a large amount of activated carbon needs to be injected, so that Lead to very high operating costs; (2) SO in the flue gas 2 and H 2 O will inhibit the adsorption of mercury by activated carbon; (3) the activated carbon after adsorbing mercury will be captured by the dust removal device together with the fly ash, and the mercury may be leached and released into the environment again, resulting in secondary pollution; (4) the introduction of ACI Carbon will affect the use value of fly ash as a raw material for concrete production; (5) The contact time between the adsorbent and the flue gas is short (usually less than 5 seconds), which greatly limits the adsorption of mercury. lead to waste of a large amount of adsorbent
Although this type of method has a high mercury removal rate, the operating cost is high, and there are problems with the safe disposal of waste absorption liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Ultrasonic cleaning 0.1g of polyurethane sponge in 20ml of acetone solution for 30min was taken out, then washed several times with deionized water and dried at 80°C;

[0034] (2) Immerse the sample obtained in step (1) into 10 g / L SnCl 2 Hydrochloric acid (volume concentration 1%, that is, the volume ratio of concentrated hydrochloric acid and water is 1:100) solution, the ratio of polyurethane sponge to the solution is 20g:1L, after soaking for 5min, take it out and wash it with deionized water several times;

[0035] (3) Immerse the sample obtained in step (2) in 1g / L AgNO 3 and ammonia water with a volume concentration of 0.1% (the volume ratio of concentrated ammonia water to water is 0.1:100), soak for 5 minutes, take it out and wash it with deionized water for several times;

[0036] (4) Place the sample obtained in step (3) in copper sulfate (5g / L), formaldehyde (10mL / L, refers to the volume ratio of 40wt% formaldehyde and water), potassium sodium tartrate ...

Embodiment 2

[0040] (1) Clean 0.3g melamine sponge ultrasonically in 40ml acetone solution for 20min, take it out, wash it several times with deionized water and dry it at 100℃;

[0041] (2) Immerse the sample obtained in step (1) into 20 g / L SnCl 2 In the hydrochloric acid (volume concentration 3%) solution, the ratio of the polyurethane sponge to the solution is 50g:1L, after soaking for 20min, take it out and wash it with deionized water several times;

[0042] (3) Immerse the sample obtained in step (2) in 2.5g / L AgNO 3 and ammonia solution with a volume concentration of 0.5%, take it out after soaking for 15 minutes and wash it several times with deionized water;

[0043] (4) Place the sample obtained in step (3) in nickel nitrate (20g / L), formaldehyde (30mL / L), potassium sodium tartrate (5g / L), ethylenediaminetetraacetic acid (20g / L), hydroxide Sodium (8g / L) mixed solution, soaked for 10min, washed several times with deionized water, and then dried at 80°C for 12h;

[0044] (5) Mi...

Embodiment 3

[0047] (1) Ultrasonic cleaning 0.5g of carbon foam in 40ml of acetone solution for 20min was taken out, then washed several times with deionized water and dried at 80°C;

[0048] (2) Immerse the sample obtained in step (1) into 25g / L SnCl 2 In the hydrochloric acid (volume concentration 3%) solution, the ratio of the polyurethane sponge to the solution is 50g:1L, after soaking for 60min, take it out and wash it several times with deionized water;

[0049] (3) Immerse the sample obtained in step (2) in 5g / L AgNO 3 and an ammonia solution with a volume concentration of 1%, soak for 60 minutes, take it out and wash it several times with deionized water;

[0050] (4) Place the sample obtained in step (3) in zinc chloride (20g / L), formaldehyde (100g / L), potassium sodium tartrate (10g / L), ethylenediaminetetraacetic acid (30g / L), hydrogen In a mixed solution of sodium oxide (15g / L), soak for 80 minutes, wash with deionized water several times, and then dry at 100°C for 12 hours;

...

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PUM

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Abstract

The invention discloses a transition metal selenide modified molded demercuration material and a preparation method thereof. The transition metal selenide modified molded demercuration material comprises a molded carrier and an active component loaded on the molded carrier, wherein the active component is a transition metal selenide, and the transition metal selenide is selected from one or more of copper selenide, nickel selenide, zinc selenide or iron selenide. The preparation method comprises the following steps: firmly and uniformly loading a certain amount of a transition metal on the molded carrier by adopting a wet chemical reduction method, and converting the transition metal into the transition metal selenide by adopting an in-situ selenylation method, thereby obtaining the transition metal selenide modified molded demercuration material. The preparation method is simple, the obtained transition metal selenide modified molded demercuration material is large in adsorption capacity, good in mechanical property, fluid property and plasticity, and is suitable for different demercuration application occasions, and the secondary release risk of mercury is reduced.

Description

technical field [0001] The invention belongs to the technical field of mercury pollution prevention and control in flue gas, and in particular relates to a molding process modified by transition metal selenide [0002] Mercury removal material and preparation method thereof. Background technique [0003] Mercury has strong volatility, persistence, long-distance transport and bioaccumulation, and is regarded as a global highly toxic pollutant. According to the latest "Global Mercury Assessment Report" released by the United Nations Environment Program, the global anthropogenic mercury emissions reached 2,150 tons in 2015, an increase of 12% over 2010, among which coal combustion and smelting industries are the largest sources of anthropogenic mercury emissions. On August 16, 2017, the globally legally binding Minamata Convention on Mercury came into effect. The Convention stipulates that measures must be taken for coal-fired boilers and smelting flue gas to control and reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/02B01J20/30B01J20/32B01D53/02
CPCB01D53/02B01D2257/602B01J20/0225B01J20/0229B01J20/0237B01J20/0244B01J20/0262B01J20/3071B01J20/3202B01J20/3236
Inventor 杨建平李琴李海龙屈文麒胡迎超
Owner CENT SOUTH UNIV
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