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Method for deep removal of zero valence mercury in mercury smelting flue gas

A technology for smelting flue gas and zero-valent mercury. It is applied in separation methods, chemical instruments and methods, and other chemical processes. It can solve the problems of high volatility, difficult removal, and low water solubility, and achieve moderate price and easy removal. effect, high removal efficiency

Inactive Publication Date: 2015-12-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But due to Hg 0 With high volatility and low water solubility, it is difficult to be effectively removed by existing equipment, while Hg 2+ Has the property of being easily soluble in water

Method used

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  • Method for deep removal of zero valence mercury in mercury smelting flue gas

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Embodiment 1

[0035] The method of deep mercury removal from mercury smelting flue gas (the process is as follows figure 1 shown), the details are as follows:

[0036] (1) The flue gas to be treated in this embodiment is mercury smelting flue gas, and the flue gas volume is 3500m 3 / h, Hg in flue gas at furnace mouth: 4-7mg / m3 After the smelting flue gas passes through the dust removal tower, the temperature of the flue gas is cooled to below 45°C;

[0037] (2) The modified activated carbon was prepared by the following method: weigh the activated carbon, wash it three times with deionized water at 20°C, dry it at 105°C for 5 hours, and impregnate the activated carbon with 0.1mol / L ferric chloride solution at room temperature 20 hours, during the impregnation process and continuous stirring; the filtered activated carbon was dried at 105°C for 5 hours, and then roasted at 200°C for 3 hours in a muffle furnace.

[0038] (3) Atomize the sodium hypochlorite solution with a mass percentage co...

Embodiment 2

[0044] The method of deep mercury removal from lead smelting flue gas, the specific content is as follows:

[0045] (1) The flue gas to be treated in this embodiment is mercury smelting flue gas, and the flue gas volume is 5000m 3 / h, Hg in flue gas at furnace mouth: 1-3mg / m 3 After the smelting flue gas passes through the dust removal tower, the temperature of the flue gas is cooled to below 45°C;

[0046] (2) The modified activated carbon is prepared by the following method: Weigh the activated carbon, wash it with 80°C deionized water for 5 times, dry it at 110°C for 12 hours, and wash it with 0.2mol / L ferric chloride solution at room temperature The activated carbon was impregnated for 30 hours, and stirred continuously during the impregnation process; the filtered activated carbon was dried at 110°C for 12 hours, and then roasted in a muffle furnace at 400°C for 8 hours.

[0047] (3) Atomize the sodium hypochlorite solution with a mass percentage concentration of 4% (so...

Embodiment 3

[0053] The method of deep mercury removal from mercury refining flue gas, the specific content is as follows:

[0054] (1) The flue gas to be treated in this embodiment is mercury smelting flue gas, and the flue gas volume is 2000m 3 / h, Hg in flue gas at furnace mouth: 5-8mg / m 3 After the smelting flue gas passes through the dust removal tower, the temperature of the flue gas is cooled to below 45°C;

[0055] (2) The modified activated carbon is prepared by the following method: Weigh the activated carbon, wash it with 50°C deionized water for 4 times, dry it at 107°C for 8 hours, and wash it with 0.15mol / L ferric chloride solution at room temperature Immerse the activated carbon for 25 hours, and keep stirring during the impregnation process; the filtered activated carbon is dried at 107°C for 8 hours, and then roasted at 300°C for 6 hours in a muffle furnace.

[0056] (3) Atomize the sodium hypochlorite solution with a mass percentage concentration of 5% (sodium chloride ...

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Abstract

The invention discloses a method for deep removal of zero valence mercury in mercury smelting flue gas and belongs to the technical field of environmental protection. According to the method, mercury-containing flue gas undergoes washing, carbon adsorption and cooling and dedusting pretreatment and then enters a secondary sodium hypochlorite spraying absorption tower, and most of zero valence mercury is removed; the flue gas is dehumidified through carbon and enters an oxidizing tower to undergo deep mercury removal, finally the emission requirements that the concentration of mercury in tail gas is lower than 0.01 mg / m<3> are met, and technologies of energy saving, emission reduction and environmental protection are greatly improved. The method is simple in process, easy to operate, less in investment, high in mercury removal efficiency and suitable for industrial application.

Description

technical field [0001] The invention relates to a method for deeply removing zero-valent mercury in flue gas from mercury smelting, and belongs to the technical field of environmental protection. Background technique [0002] Global mercury pollutants have attracted widespread attention. In view of the global migration of atmospheric mercury and its harmfulness to human health, research on atmospheric mercury emissions is of great significance. On October 11, 2013, the Diplomatic Plenipotentiary Conference of the Minamata Convention hosted by the United Nations Environment Program closed in Kumamoto, Japan on the 11th. Representatives from 92 countries and regions, including China, finally signed the Minamata Convention, which marks a new and important step for the global joint efforts to reduce mercury pollution. The Minamata Convention reaffirms the principle of "common but differentiated responsibilities" and makes specific arrangements for the production, circulation, u...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/64B01D53/96B01J20/20B01J20/32
Inventor 宁平王郎郎王学谦马懿星林奕龙
Owner KUNMING UNIV OF SCI & TECH
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