Method for purifying non ferrous metal smelting flue gas and realizing synchronized multiple resource utilization

A technology for smelting flue gas and non-ferrous metals, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles. It can solve the problems of outlet mercury concentration exceeding emission standards, lower mercury removal efficiency, and high operating costs, so as to save process and equipment, improve removal efficiency, and reduce operating costs

Active Publication Date: 2013-10-02
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, there are also some problems in this process: First, the process requires that the temperature of the flue gas be lowered to 30-40 degrees, so that the concentration of mercury in the flue gas at the entrance of the absorption tower is controlled at 30 mg / m 3 Absorption will be carried out later, otherwise the absorption efficiency will be significantly reduced, and the mercury concentration at the outlet will exceed the emission standard; second, after the sulfur dioxide in the flue gas of non-ferrous metal smelting is absorbed, the generated sulfite ions will reduce the Hg in the absorption liquid 2+ , thereby reducing the overall mercury removal efficiency; third, the outlet mercury concentration of the process is generally 0.1mg / m 3 , unable to meet increasingly stringent mercury emission standards
The acid production process used has a large area, complex process, and relatively high operating costs. The acid production products will contain a certain concentration of mercury, which needs to be further removed

Method used

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  • Method for purifying non ferrous metal smelting flue gas and realizing synchronized multiple resource utilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]A glass bubble absorption device with a volume of 500mL is used as a reactor, and the reactor is filled with 250mL of absorption liquid. The absorption solution uses distilled water as a solvent, and its main components and concentrations are: mercury sulfate (1.48g / L), sulfuric acid (49g / L), and elemental iodine (127g / L). Into the reactor into the zero-valent mercury concentration of 3mg / m 3 The simulated flue gas, the flue gas flow rate is controlled at 1L / min, and the temperature of the reaction system is maintained at about 25 degrees. By monitoring the zero-valent mercury in the tail gas, the results show that the concentration of zero-valent mercury in the tail gas is basically maintained at 30 μg / m 3 From this calculation, the removal efficiency of zero-valent mercury is about 99.0%. The concentration of sulfur dioxide in the reactor is 3mg / m 3 The simulated flue gas, the flue gas flow rate and temperature are still controlled at about 1L / min and 25 degrees res...

Embodiment 2

[0046] A glass wet scrubber with an inner diameter of 100 mm and a length of 1200 mm was used as a reactor for a small test experiment. The composite absorption solution uses distilled water as the solvent, and its main components and concentrations are: mercury sulfate (2.96g / L), sulfuric acid (98g / L), and elemental iodine (254g / L). Pass the simulated flue gas into the wet scrubber, the flue gas volume is 2m 3 / h, the temperature is 25 degrees. At the same time, the composite absorption liquid is sprayed into the wet scrubber through the multi-layer atomization nozzle, the injection amount of the absorption liquid is 10L / h, and the liquid-gas ratio of the reaction system is 5L / m 3 . The zero-valent mercury content in the simulated flue gas is 2mg / m 3 , the concentration of sulfur dioxide is 8000mg / m 3 . The tail gas passing through the wet scrubber was monitored, and the results showed that the zero-valent mercury content in the tail gas was about 12 μg / m 3 , the concen...

Embodiment 3

[0048] Such as figure 1 As shown, a method for purifying non-ferrous metal smelting flue gas and simultaneously realizing multiple resource utilization, the method includes the following steps:

[0049] In the first step, mercuric sulfate, sulfuric acid, elemental iodine and water are mixed and formulated into a composite absorption liquid and stored in the compound absorption liquid dosing tank 8; the main components of the composite absorption liquid are mercuric sulfate, sulfuric acid, elemental iodine and Water, wherein the concentrations of mercury sulfate, sulfuric acid and elemental iodine are: 0.1mol / L, 0.6mol / L and 0.05mol / L respectively, and the temperature of the composite absorption liquid is maintained within the range of 30-60 degrees.

[0050] In the second step, pass the composite absorption liquid V6 in the composite absorption liquid distribution tank 8 into the composite absorption liquid circulation tank 2;

[0051] The third step is to spray the composite...

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Abstract

The invention relates to a method for purifying non ferrous metal smelting flue gas and realizing synchronized multiple resource utilization. The method is as below: using a composite absorption liquid comprising main components of mercury sulfate, sulfuric acid and iodine to carry out high efficiency absorption of sulfur dioxide and zero valent mercury in the non ferrous metal smelting; conversing sulfur dioxide into sulfuric acid through reaction with iodine, and conversing zero valent mercury into mercurous sulfate through reaction with mercury sulfate; and finally separating and decomposing the absorption liquid to recover generated sulfuric acid and zero, and simultaneously utilizing other methods to separate, purify and decompose the hydrogen iodide generated in the reaction process for hydrogen production. The method provided by the invention mainly carries out discharge control and recovery utilization of flue gas containing high-concentration sulfur dioxide and zero valent mercury in the non ferrous metal smelting industry, and realizes multiple resource.

Description

technical field [0001] The invention belongs to the air pollution control technology in the field of environmental protection, and in particular relates to a method for purifying nonferrous metal smelting flue gas and simultaneously realizing multiple resource utilization. Background technique [0002] As a persistent toxic pollutant, mercury pollution has attracted worldwide attention. The United Nations Environment Program (UNEP) has listed mercury as a global pollutant. In January 2013, the United Nations Intergovernmental Negotiating Committee adopted a legally binding "International Convention on the Prevention and Control of Mercury Pollution", which aims to control and reduce mercury emissions on a global scale, so as to reduce its damage to the environment and human health. As one of the world's leading mercury emitters, my country will face severe pressure to implement the contract. [0003] Among the numerous anthropogenic sources of mercury emissions, mercury em...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/64B01D53/50B01D53/96
Inventor 瞿赞晏乃强马永鹏黄文君徐浩淼
Owner SHANGHAI JIAO TONG UNIV
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