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Denitration device and denitration method for flue gas in wet-method gold melting and/or silver melting section

A denitrification and wet process technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problem of high cost of denitrification methods, and achieve the effect of reducing overall operating costs, reducing operating costs and saving costs.

Pending Publication Date: 2018-08-31
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The main purpose of the present invention is to provide a denitrification device and denitrification method for flue gas in the wet melting gold and / or silver melting section, so as to solve the problem of high cost of the denitrification method in the prior art

Method used

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  • Denitration device and denitration method for flue gas in wet-method gold melting and/or silver melting section
  • Denitration device and denitration method for flue gas in wet-method gold melting and/or silver melting section
  • Denitration device and denitration method for flue gas in wet-method gold melting and/or silver melting section

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] use figure 1 The de-pinning device shown denitrifies the flue gas from the wet gold and / or silver melting section, that is, performs ozone oxidation and denitration treatment on the flue gas from the wet gold melting and / or silver melting section to obtain oxidized flue gas; Washing the oxidized flue gas to obtain the washed flue gas and dilute acid solution; washing the washed flue gas with an alkaline solution to obtain exhaustable flue gas and absorbed salt solution; and reusing the dilute acid solution to the Wet gold and / or silver melting section. Among them, the online flue gas analyzer is used to detect the composition and temperature of the main nitrogen oxides in the flue gas in real time, as shown in Table 1, and the flue gas treatment capacity is 5500Nm 3 / h.

[0053] Table 1

[0054] Composition of flue gas

NO

NO 2

HCl

temperature / ℃

Concentration (mg / Nm 3 )

620

833

436

45

[0055] In the process of ozo...

Embodiment 2

[0060] use figure 1 The denitration device shown denitrifies the flue gas from the wet gold and / or silver melting section. The composition and temperature of the main nitrogen oxides in the flue gas are shown in Table 3, and the flue gas treatment capacity is 3200Nm 3 / h.

[0061] table 3

[0062] Composition of flue gas

NO

NO 2

HCl

temperature / ℃

Concentration (mg / Nm 3 )

625

830

432

45

[0063] In the process of ozone oxidation and denitrification treatment of flue gas, the weight ratio of ozone to nitric oxide in flue gas is controlled to be 1.6:1; in the process of washing the oxidized flue gas with water, the spray density of water is controlled to be 8m 3 / (m 2 ﹒ h), when using an alkaline solution to wash the washed flue gas, the alkaline solution uses 20% sodium hydroxide aqueous solution, and controls the nitrogen oxides and sodium hydroxide in the washed flue gas by controlling the spray speed of the alkaline sol...

Embodiment 3

[0068] use figure 1 The de-pinning device shown denitrifies the flue gas of the wet gold and / or silver melting section. The composition and temperature of the main nitrogen oxides in the flue gas are shown in Table 5, and the flue gas treatment capacity is 8650Nm 3 / h.

[0069] table 5

[0070]

[0071]

[0072] In the process of ozone oxidation and denitrification treatment of flue gas, the weight ratio of ozone to nitric oxide in flue gas is controlled to be 2.5:1; in the process of washing the oxidized flue gas with water, the spray density of water is controlled to be 2.5 m 3 / (m 2 ﹒ h), when using an alkaline solution to wash the washed flue gas, the alkaline solution uses 20% sodium hydroxide aqueous solution, and controls the nitrogen oxides and sodium hydroxide in the washed flue gas by controlling the spray speed of the alkaline solution The molar ratio is 1:1.5.

[0073] The composition of the exhausted flue gas was tested, and the test results are shown ...

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Abstract

The invention provides a denitration device and denitration method for a flue gas in a wet-method gold melting and / or silver melting section. The denitration device comprises an ozonation denitrationunit, a water washing unit and an alkali washing unit, wherein a flue gas inlet and an oxidized outlet are formed in the ozonation denitration unit; an oxidized inlet, a washed flue gas outlet and a diluted acid liquid outlet are formed in the water washing unit; the oxidized inlet is connected with the oxidized outlet; the diluted acid liquid outlet is connected with the wet-method gold melting and / or silver melting section to provide a part of an acid liquid to the wet-method gold melting and / or silver melting section; a washed flue gas inlet, a flue gas discharge hole and an absorbed salt liquid outlet are formed in the alkali washing unit; the washed flue gas inlet is connected with the washed flue gas outlet. High-valence nitric oxides in oxidized flue gases can be absorbed by the water washing unit to prepare a diluted acid liquid, the diluted acid liquid is fed back into the wet-method gold melting and / or silver melting section, then the cost of old melting and / or silver meltingcan be reduced, and the overall operation cost is lowered; meanwhile, through the alkali washing unit, nitrate or nitrite is prepared, so that the operation cost can be further reduced.

Description

technical field [0001] The invention relates to the field of flue gas treatment, in particular to a denitrification device and a denitrification method for flue gas in a wet gold and / or silver melting section. Background technique [0002] The wet gold and silver melting section of the precious metal smelting industry is intermittently operated. Only during the gold and silver melting process will the flue gas containing nitrogen oxides be produced. NO and NO in the flue gas 2 The concentration of NO changes with the consumption of nitric acid in the process of sample dissolution. 2 Concentration from high to low, NO concentration from low to high, most of the time NO 2 The content accounts for the majority, exceeding 50% of the total amount of nitrogen oxides. [0003] Different from flue gas denitrification in power plants, the existing denitrification technologies are mainly SCR and SNCR technologies. SCR denitrification technology uses ammonia as a denitrification agen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/76B01D53/78B01D53/56
CPCB01D53/1456B01D53/56B01D53/75B01D53/76B01D53/78B01D2251/104
Inventor 杜士帽姚亮殷书岩王姣
Owner CHINA ENFI ENGINEERING CORPORATION
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