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Synergetic purification method and device for SO2 and heavy metals in smelting flue gas

A technology for smelting flue gas and heavy metals, applied in chemical instruments and methods, fertilization devices, separation methods, etc., can solve the problems of large fluctuations in gas volume and high concentration

Inactive Publication Date: 2014-05-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] For SO in smelting flue gas 2 The problem of high concentration, large fluctuations in gas volume, and multiple heavy metals such as Hg, As, Cd, Pb, and Zn at the same time, the purpose of this invention is to propose a solution for SO in smelting flue gas 2 Synergistic purification method and device with heavy metals, using (NH 4 ) 2 S solution absorption method for simultaneous removal of SO 2 and Hg, As, Cd, Pb, Zn, etc., specifically comprising the following steps:

Method used

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  • Synergetic purification method and device for SO2 and heavy metals in smelting flue gas

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Embodiment 1

[0058] In this embodiment, the zinc smelting flue gas is used as the processing object, and the SO in the zinc smelting flue gas 2 : 4~8%, Hg: 5mg / m 3 , As: 1~5mg / m 3 , Pb: 5~8 mg / m 3 , Cd: 2~7 mg / m 3 , Zn: 20~30 mg / m 3 ; Concretely include the following steps:

[0059] (1) After preliminary dedusting of the smelting flue gas, further cool the flue gas temperature to 50°C;

[0060] (2) Fully contact the cooled flue gas with the atomized ammonium sulfide solution with a pH value of 7, and the 2 The smelting flue gas is absorbed, and the metal oxides in the flue gas are absorbed at the same time. The purified flue gas is discharged after deep heavy metal removal by the fixed bed catalytic heavy metal removal device, and the mass percentage concentration of the ammonium sulfide solution is 8%;

[0061] (3) Absorbed SO 2After the rich liquid with heavy metals is filtered through pressure filtration, the precipitates of heavy metal sulfides in the solution are filtered, and ...

Embodiment 2

[0068] This embodiment takes the lead smelting flue gas as the processing object, and the SO in the lead smelting flue gas 2 : 8~12%, Hg: 2~5mg / m 3 , As: 1~5mg / m 3 , Pb: 35~45mg / m 3 , Cd: 1~3 mg / m 3 , Zn: 1~5 mg / m 3 Specifically include the following steps:

[0069] (1) After preliminary dedusting of the smelting flue gas, further cool the flue gas temperature to 40°C;

[0070] (2) Fully contact the cooled flue gas with the atomized ammonium sulfide solution with a pH value of 7, and the 2 The smelting flue gas is absorbed, and the metal oxides in the flue gas are absorbed at the same time. The purified flue gas is discharged after deep heavy metal removal by the fixed bed catalytic heavy metal removal device, and the mass percentage concentration of the ammonium sulfide solution is 25%;

[0071] (3) Absorbed SO 2 After the rich liquid with heavy metals passes through pressure filtration, the precipitate of heavy metal sulfide in the solution is filtered, and the filter...

Embodiment 3

[0078] In this embodiment, the nickel smelting flue gas is used as the treatment object, and the SO in the nickel smelting flue gas 2 : 0.8~2.0%, Hg: 1~4mg / m 3 , As: 3~5mg / m 3 , Pb: 10~25mg / m 3 , Cd: 1~3 mg / m 3 , Zn: 2~6mg / m 3 ; Concretely include the following steps:

[0079] (1) After preliminary dedusting of the smelting flue gas, further cool the flue gas temperature to 30°C;

[0080] (2) Fully contact the cooled flue gas with the atomized ammonium sulfide solution with a pH value of 6, and the 2 The smelting flue gas is absorbed, and the metal oxides in the flue gas are absorbed at the same time. The purified flue gas is discharged after deep removal of heavy metals by a fixed-bed catalytic mercury removal device, and the mass percentage concentration of ammonium sulfide solution is 15%;

[0081] (3) Absorbed SO 2 After the rich liquid with heavy metals passes through pressure filtration, the precipitates of heavy metal sulfides in the solution are filtered, and th...

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Abstract

The invention discloses a synergetic purification method and a synergetic purification device for SO2 and heavy metals in smelting flue gas and belongs to the technical field of atmospheric pollution. The synergetic purification method comprises the steps of absorbing and purifying the SO2 and the heavy metals (such as Hg, As, Pb, Cd and Zn) through (NH4)2S solution serving as an absorbent; feeding the smelting flue gas subjected to dust removal into a second-level ammonium sulfide solution absorption tower so as to enable the absorbent to absorb and purify the SO2 and the heavy metals in the gas, wherein the heavy metals are settled down in the form of solid sulfide and are recycled after being filtered, and the SO2 is converted into NH4HSO3 and (NH4)2S2O3 which are retained in absorption liquid; after the absorption reaction is terminated, neutralizing, oxidizing and evaporatively crystallizing the absorption liquid to obtain (NH4)2SO4 and (NH4)2S2O3 solid mixtures which can be directly sold as fertilizers. The technology is simple and is easy to operate; the desulfuration efficiency is high, the cost is low, and the synergetic purification method is suitable for industrial application.

Description

technical field [0001] The invention relates to a method for SO in smelting flue gas 2 A method and device for synergistically purifying heavy metals belong to the technical field of air pollution. Background technique [0002] Non-ferrous metals mostly form sulfide ores with sulfur, such as sphalerite, galena, chalcocite, goethite, etc., which are important raw materials for the metallurgical industry. In the non-ferrous smelting industry, there are generally two metallurgical processes, pyromethod and hydromethod, and most of them now use pyromethods to treat metallurgical ores. In the process of pyrometallurgy, the sulfide ore is roasted at high temperature to separate sulfur and metal, and the sulfur is converted into sulfur dioxide and discharged with the roasting flue gas. In the discharged flue gas, in addition to containing SO 2 In addition, it also contains heavy metals and toxic non-metals. Among the heavy metals are mercury (Hg), arsenic (As), lead (Pb) cadmium,...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/86B01D53/50B01D53/64B01D53/96C01C1/245C01B17/64C05C3/00
Inventor 王学谦王郎郎宁平殷在飞马懿星
Owner KUNMING UNIV OF SCI & TECH
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