Method for regenerating flue gas demercuration material and recovering elemental mercury

A technology for recovering single and elemental mercury, which is applied in chemical instruments and methods, separation methods, filter regeneration, etc., and can solve the problems of increasing impregnation, filtration, cleaning and drying processes, large resource and energy consumption, and difficulty in industrial application. , to achieve the effect of resource utilization, no secondary pollution, and low cost

Active Publication Date: 2022-03-01
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Metal sulfides have a certain demercuration effect, but the materials after demercuration of metal sulfides are hazardous waste if they cannot be effectively treated. At present, the regeneration methods of metal sulfide demercurants have been partially reported
Chinese patent (CN106215845A) discloses the regeneration of a copper-based mercury removal agent, through the 2 / SiO 2 Mixing, HCl, N 2 , O 2 Mixed gas, high-temperature mercury removal, and then sieving, ultrasonic pickling, sulfur-based / hydroxyl impregnation, low-temperature drying and calcination to obtain a regenerated copper-based mercury removal agent. Industrial application
Chinese patent (CN109092277A) discloses a kind of metal sulfide mercury removal agent (metal sulfides such as lead, zinc, copper, iron, manganese, molybdenum, cobalt, nickel) adopts temperature rise mercury removal and Cu 2+ Solution immersion activation regeneration method, this regeneration method increases the immersion, filtration, cleaning and drying processes, and the amount of wastewater is large

Method used

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  • Method for regenerating flue gas demercuration material and recovering elemental mercury
  • Method for regenerating flue gas demercuration material and recovering elemental mercury
  • Method for regenerating flue gas demercuration material and recovering elemental mercury

Examples

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Effect test

Embodiment 1

[0035] Using ZnS / C composite material (ZnS mass percentage content is about 30%) as the mercury removal material, the mercury-containing flue gas is demercurized, the temperature is 60°C, and the mercury-containing flue gas composition is SO 2 6% (volume percentage), O 2 6% (volume percentage), Hg 0 4000μg / m 3 , when the mercury concentration reaches 75% of the breakthrough concentration, the mercury-containing ZnS / C composite material is transferred to the mercury removal device, and the temperature is raised to 300°C under the protection of nitrogen, and the temperature is maintained until the mercury concentration in the outlet gas is lower than 10 μg / m 3 After that, the mercury removal composite material is regenerated by injecting S10% (volume percentage) and nitrogen mixed regenerating gas, the regenerating temperature is maintained at 300° C., and the regenerating time is 6 hours. Under the protection of nitrogen, the temperature was naturally lowered to 50°C, and t...

Embodiment 2

[0037] CuS / Al 2 o 3 The composite material (CuS mass percentage content is about 30%) is used as a mercury removal material to perform mercury removal treatment on mercury-containing flue gas. The temperature is 70°C, and the composition of mercury-containing flue gas is SO 2 6% (volume percentage), O 2 6% (volume percentage), Hg 0 4000μg / m 3 , when the mercury concentration reaches 75% of the breakthrough concentration, the mercury-containing CuS / Al 2 o 3 The composite material is transferred to the mercury removal device, and the temperature is raised to 400°C under the protection of nitrogen, and the temperature is maintained until the concentration of mercury in the gas is lower than 10 μg / m 3 After that, pass into SO 2 5% (volume percentage), H 2 S10% (volume percentage), nitrogen mixed regeneration gas to regenerate the mercury removal composite material, the regeneration temperature is maintained at 400°C, and the regeneration time is 3h. Under the protection...

Embodiment 3

[0039] With Co 9 S 8 / C composite material (Co 9 S 8 The mass percentage content is about 30%) as a mercury removal material, and the mercury-containing flue gas is demercurized. The temperature is 50 ° C, and the mercury-containing flue gas composition is SO 2 6% (volume percentage), O 2 6% (volume percentage), Hg 0 4000μg / m 3 , when the mercury concentration reaches 75% of the breakthrough concentration, the mercury-containing Co 9 S 8 The / C composite material is transferred to the mercury removal device, and the temperature is raised to 350°C under the protection of nitrogen, and the temperature is maintained until the concentration of mercury in the gas is lower than 10 μg / m 3 Afterwards, the mercury removal composite material is regenerated by feeding S 5% (volume percentage) and nitrogen mixed regeneration gas, the regeneration temperature is maintained at 400°C, and the regeneration time is 3h. Under the protection of nitrogen, the temperature was naturally l...

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Abstract

The invention discloses a method for regenerating a flue gas demercuration material and recovering elemental mercury. The method comprises the following steps: calcining a metal sulfide demercuration material which adsorbs elemental mercury to be saturated in a protective atmosphere I, recovering mercury vapor through condensation to obtain an inactivated metal sulfide demercuration material, and placing the inactivated metal sulfide demercuration material in a sulfur-containing vapor atmosphere to obtain the mercury-containing metal sulfide demercuration material. And calcining II in a mixed atmosphere containing hydrogen sulfide and / or sulfur vapor and sulfur dioxide, or in a mixed atmosphere containing hydrogen sulfide and / or sulfur vapor and sulfur dioxide, or in an atmosphere containing sulfur dioxide to obtain the regenerated metal sulfide demercuration material. According to the method, the desorption and recovery efficiency of elemental mercury adsorbed by the metal sulfide mercury removal material is high, the regenerated metal sulfide mercury removal material can keep high mercury removal activity and can be recycled for a long time, and the method is easy to operate, short in process, low in cost, environmentally friendly and beneficial to large-scale application and popularization.

Description

technical field [0001] The invention relates to a method for regenerating flue gas mercury removal materials, in particular to a method for regenerating mercury removal materials adsorbed to saturation after flue gas mercury removal and recovering elemental mercury, which belongs to the technical field of mercury-containing flue gas treatment. Background technique [0002] Mercury is an important air pollutant, which is extremely harmful to the ecology. The world attaches great importance to mercury pollution emissions. Non-ferrous smelting is an important source of atmospheric mercury emissions. It is urgent to control the emission of mercury in non-ferrous smelting flue gas. [0003] Metal sulfides have a certain demercuration effect, but the materials after demercuration of metal sulfides are hazardous waste if they cannot be effectively disposed of. At present, the regeneration methods of metal sulfide demercurants have been partially reported. Chinese patent (CN10621584...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34B01D53/02C22B43/00C22B7/02
CPCB01J20/3458B01D53/02C22B43/00C22B7/02B01D2257/602B01D2258/0283B01D2259/40098Y02P10/20
Inventor 沈锋华李焌源刘恢何书丹向开松刘操李超芳闵小波林璋李青竹柴立元
Owner CENT SOUTH UNIV
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