A kind of regenerable recycling mercury adsorbent and its preparation and regeneration method

A technology of adsorbent and elemental mercury, which is applied in the field of mercury adsorbent and its preparation and regeneration, can solve the problems that mercury cannot be centrally controlled, unfavorable for fly ash recycling, and affects the carbon content of fly ash, etc., to achieve large-scale production , Reduce the cost of mercury removal, the effect of short production cycle

Active Publication Date: 2020-06-02
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the essence of these two technologies is to transfer mercury from coal-fired flue gas to desulfurization solution or desulfurization gypsum, which does not fundamentally solve the problem, and is easy to cause pollution due to the secondary release of mercury
At present, the mercury adsorbents put into industrial application are mainly carbon-based adsorbents such as activated carbon. This type of adsorbent mainly has the following problems: 1) The amount of adsorbent is large, and the operating cost is high; 2) It affects the carbon content of fly ash, which is not conducive to fly ash. 3) The adsorbent is mixed with fly ash and cannot be regenerated; 4) The adsorbed mercury cannot be centrally controlled, which is likely to cause secondary pollution; 5) The temperature window is narrow, only between 100 and 170°C Able to maintain high mercury removal efficiency

Method used

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  • A kind of regenerable recycling mercury adsorbent and its preparation and regeneration method
  • A kind of regenerable recycling mercury adsorbent and its preparation and regeneration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A renewable and recyclable mercury sorbent with the chemical formula CuMn 2 o 4 . Its preparation method comprises the following steps:

[0034] (1) Weigh a certain amount of copper nitrate and citric acid and dissolve them in deionized water.

[0035] (2) Then, under the condition of stirring, in the mixed solution that step (1) obtains, add a certain amount of manganese nitrate so that the molar ratio of Cu / Mn is 1:2, and the molar ratio of metal cation / citric acid is 1, React for 1 h at 50°C.

[0036] (3) Stir and evaporate in a water bath at 80° C. until a colloid is formed, and dry the colloid in a drying oven at 100° C. for 10 hours. Then, it was calcined in a muffle furnace at 400°C for 3 hours, so as to ensure that the citric acid in the colloid was completely burned and released in the form of gas.

[0037] (4) Grinding and sieving the calcined sample to obtain CuMn with a particle size less than 150 μm 2 o 4 Spinel mercury sorbent.

Embodiment 2

[0039] A renewable and recyclable mercury sorbent with the chemical formula Cu 0.8 mn 2.2 o 4 . Its preparation method comprises the following steps:

[0040] (1) Weigh a certain amount of copper nitrate and citric acid and dissolve them in deionized water.

[0041] (2) Then, under the condition of stirring, add a certain amount of manganese nitrate to the mixed solution that step (1) obtains so that the molar ratio of Cu / Mn is 0.8:2.2, and the molar ratio of metal cation / citric acid is 1.25, React at 60°C for 2h.

[0042] (3) Stir and evaporate in a water bath at 90° C. until a colloid is formed, and dry the colloid in a drying oven at 110° C. for 11 hours. Then, it was calcined in a muffle furnace at 425°C for 4 hours, so as to ensure that the citric acid in the colloid was completely burned and released in the form of gas.

[0043] (4) Grind and sieve the calcined sample to obtain Cu with a particle size of less than 150 μm 0.8 mn 2.2o 4 Spinel mercury sorbent.

Embodiment 3

[0045] A renewable and recyclable mercury sorbent with the chemical formula Cu 0.5 mn 2.5 o 4 . Its preparation method comprises the following steps:

[0046] (1) Weigh a certain amount of copper nitrate and citric acid and dissolve them in deionized water.

[0047] (2) Then, under the condition of stirring, add a certain amount of manganese nitrate to the mixed solution that step (1) obtains so that the molar ratio of Cu / Mn is 0.5:2.5, and the molar ratio of metal cation / citric acid is 1.5, React at 70°C for 3h.

[0048] (3) Stir and evaporate in a water bath at 95° C. until a colloid is formed, and dry the colloid in a drying oven at 115° C. for 11.5 hours. Then, it was calcined in a muffle furnace at 450°C for 4.5 hours, so as to ensure that the citric acid in the colloid was completely burned and released in the form of gas.

[0049] (4) Grind and sieve the calcined sample to obtain Cu with a particle size of less than 150 μm 0.5 mn 2.5 o 4 Spinel mercury sorbent....

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Abstract

The invention belongs to the technical field of coal-fired flue gas pollutant control and discloses a renewable cyclic utilization mercury adsorbent as well as a preparation method and a regenerationmethod thereof. The mercury adsorbent is CuxMn(3-x)O4. The preparation method comprises the following steps: (1) dissolving copper substances and a chelating dispersant into deionized water to form amixed solution I, and forming chelating ions from copper ions; (2) putting dissoluble manganese substances into the mixed solution I to form a mixed solution II; (3) stirring the mixed solution II toform colloid, and drying and calcining the colloid; (4) grinding the colloid. The regeneration method comprises the following steps: (1) putting the mercury adsorbent after demercuration into a regeneration reactor; (2) introducing air flow; (3) performing condensation, and recycling monomer mercury; (4) adjusting the flow of the air flow, and regenerating activating substances on the surface of the mercury adsorbent. The mercury adsorbent provided by the invention can be recycled and regenerated, the regeneration method is simple, and the demercuration cost can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of coal-burning flue gas pollutant control, and more specifically relates to a regenerable and recyclable mercury adsorbent and a preparation and regeneration method thereof. Background technique [0002] Mercury is a toxic air pollutant, which causes great harm to the ecological environment and human beings. Coal-fired power plants are considered to be one of the largest anthropogenic sources of mercury emissions. In 2013, the U.S. Environmental Protection Agency (EPA) updated mercury emission standards for coal-fired power plants, which require that current power plants burning low-rank coals must emit less than 0.003 1b / GWh of mercury. The "Emission Standard of Air Pollutants for Thermal Power Plants" promulgated by the Ministry of Environmental Protection of China requires that thermal power plants implement 0.03mg / m from January 1, 2015 3 The emission limits of mercury and compound pollutants. Based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/12B01J20/06B01J20/34B01D53/02
Inventor 刘晶杨应举王震苗森丁俊彦
Owner HUAZHONG UNIV OF SCI & TECH
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