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A method for comprehensively treating copper slag tailings and smelting flue gas

A technology for comprehensive treatment of smelting flue gas, applied in the field of resources and environment, can solve the problems of difficult desulfurization system absorption, poor NO solubility, etc.

Active Publication Date: 2020-07-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Copper slag tailings contain fayalite, magnesium ferrite and other active substances, which can efficiently absorb SO in flue gas 2 , while NO has poor solubility and is difficult to be absorbed by the desulfurization system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] In this embodiment, the smelting flue gas is processed, and the flue gas volume is 24m 3 / h, SO in flue gas 2 , NO x Concentrations are 1500mg / m 3 and 200mg / m 3 .

[0063] Control the temperature of smelting flue gas to 60°C, and spray ozone into the smelting flue gas, ozone and NO x The molar ratio is 1.5:1; the flue gas after ozone oxidation enters the absorption tower, and the copper slag tailings slurry is used as the absorption slurry to absorb the SO in the flue gas 2 and NO x For absorption, the liquid-gas ratio is 10L / m 3 . Through MRU infrared flue gas analyzer to export SO 2 , NO x The concentration was detected, and the results showed that the treated flue gas SO 2 and NO x Concentrations were 36.5mg / m 3 and 30mg / m 3 , flue gas desulfurization and denitrification efficiencies were 97.6% and 85%, respectively.

Embodiment 2

[0065] In this embodiment, in addition to controlling the temperature of the smelting flue gas to be 80°C, and the temperature of ozone and NO x Except that the molar ratio is 1.75:1, other conditions are exactly the same as in Example 1.

[0066] The results show that the flue gas desulfurization and denitrification efficiencies are 97.8% and 89.2%, respectively.

Embodiment 3

[0068] In this example, in addition to controlling the temperature of the smelting flue gas to be 100°C, and the temperature of ozone and NO x Except that the molar ratio is 2:1,

[0069] The results show that the flue gas desulfurization and denitrification efficiencies are 98.9% and 94.2%, respectively.

[0070] It can be seen from Examples 1-3 that in the method provided by the present invention, the copper slag tailings slurry can efficiently desulfurize and denitrify the smelting flue gas after ozone oxidation, and the desulfurization efficiency can reach more than 98%, and the denitrification efficiency can reach 94%. above.

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PUM

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Abstract

The invention relates to a method for comprehensively treating copper slag tailings and metallurgical off-gas. The method comprises the steps that the metallurgical off-gas oxidized by ozone is absorbed by utilizing copper slag tailing slurry, (NH4)2S is added into a liquid phase after solid-liquid separation, after precipitation is conducted completely, solid-liquid separation is conducted to obtain CuS, ZnS and the like, ammonium hydroxide is added into an obtained liquid phase, after precipitation is conducted completely, solid-liquid separation is conducted to obtain Fe(OH)3, and an obtained liquid phase is heated, concentrated, cooled and crystalized to obtain ammonium sulfate and ammonium nitrate. NOx is transformed into NO2 and N2O5 which are more easily absorbed through ozone oxidation, the copper slag tailing slurry serves as an absorbing agent, efficient and simultaneous removal of sulphur and nitre is achieved, valuable resources are efficiently recycled through follow-up stepwise treatment, comprehensive treatment and resource utilization of the copper slag tailings and the metallurgical off-gas are achieved at the same time, and the method conforms to the control thought that wastes are treated by utilizing wastes and pollutants are removed simultaneously, and has good economic benefits and application prospects.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a method for comprehensively treating copper slag tailings and smelting flue gas. Background technique [0002] The pyrometallurgy process is the mainstream process in nonferrous smelting in my country, accounting for more than 90%. Since minerals usually exist in the form of sulfide in non-ferrous smelting, and the smelting temperature is high, there is a relatively high concentration of SO 2 , and some low concentrations of NO x , At the same time, a large amount of smelting waste residue is produced in the smelting process. [0003] At present, commonly used terminal desulfurization technologies include wet technologies such as limestone-gypsum method, magnesium oxide method, and double alkali method, as well as semi-dry technologies such as circulating fluidized bed method and dense phase dry tower method; commonly used denitrification technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/08C01G3/12C01G49/02C05C1/00C05C3/00
CPCC01G3/12C01G9/08C01G49/02C05C1/00C05C3/00
Inventor 朱廷钰王健赵海楠徐文青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI