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Method for recycling sulfur dioxide (SO2) and heavy metal in metallurgical gas

A technology for smelting flue gas and heavy metals, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of not considering the removal of low-concentration heavy metals, not considering the separation of sulfur and heavy metals, and secondary pollution of heavy metals, etc. Achieve the effect of resource utilization, avoid heavy metal discharge, and high desulfurization rate

Inactive Publication Date: 2013-03-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] However, there are still the following problems in the treatment of flue gas in the non-ferrous smelting industry: (1) Non-ferrous metal ores generally contain Hg, Pb, As, Cd and other associated substances. During the smelting process, they are generally emitted with the flue gas in the form of particulate matter or volatile
[0012] The existing methods have the following problems: (1) The existing technology is only for the high concentration of SO in the flue gas 2 For recovery, low concentrations of SO were not considered 2 and removal of heavy metals; (2) Sodium sulfide solution is used to absorb sulfur dioxide, without considering the separation of sulfur and heavy metals, heavy metals are not recovered, and secondary pollution of heavy metals is easy to occur

Method used

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  • Method for recycling sulfur dioxide (SO2) and heavy metal in metallurgical gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: SO in zinc smelting flue gas 2 and heavy metal recycling methods, the details are as follows:

[0053] (1) The flue gas to be treated in this example is zinc smelting flue gas, and the flue gas volume is 10000m 3 / h, the flue gas at the furnace mouth contains SO 2 : 4-6%, Hg: 0.2mg / m 3 , As: 1-5mg / m 3 , Pb: 10-15 mg / m 3 , Cd: 2-7 mg / m 3 ; Zinc smelting flue gas 1 enters cooler 2 after dedusting, and cools the flue gas temperature to below 40°C;

[0054] (2) Atomize the ammonium sulfide solution with a mass percentage concentration of 3% through the vortex nozzle in the absorption tower 3. After cooling, the flue gas enters the absorption tower 3 countercurrently and fully contacts the atomized ammonium sulfide solution. 2 The smelting flue gas is efficiently absorbed, and at the same time, the metal oxides such as mercury, lead, arsenic, and cadmium in the flue gas are effectively absorbed, and the purified flue gas 4 is discharged from the top of the t...

Embodiment 2

[0058] Example 2: SO in lead smelting flue gas 2 and heavy metal recycling methods, the details are as follows:

[0059] (1) The flue gas to be treated in this example is lead smelting flue gas, and the flue gas volume is 50000m 3 / h, the flue gas at the furnace mouth contains SO 2 : 8-15%, Hg: 0.4mg / m 3 , As: 1-5mg / m 3 , Pb: 35-45mg / m 3 , Cd: 1-3 mg / m 3 ;After preliminary dedusting of the smelting flue gas, the temperature of the cooling flue gas is lower than 40°C;

[0060] (2) The ammonium sulfide solution with a mass percentage concentration of 5% is atomized through the vortex nozzle in the absorption tower, and the smelting flue gas is purified and absorbed through the atomized ammonium sulfide solution, and the purified flue gas is discharged to absorb SO 2 The rich solution with heavy metals enters the self-redox reactor, and the rich solution is treated in the reactor for 30 minutes. During this process, metal sulfides such as mercury, lead, arsenic and cadmium...

Embodiment 3

[0063] Example 3: SO in nickel smelting flue gas 2 and heavy metal recycling methods, the details are as follows:

[0064] (1) The flue gas to be treated in this example is nickel smelting flue gas, and the flue gas volume is 36000m 3 / h, the flue gas collected by the converter contains SO 2 : 0.8-1.1%, Hg: 0.2mg / m 3 , As: 3-5mg / m 3 , Pb: 10-25mg / m 3 , Cd: 1-3 mg / m 3 ;After preliminary dedusting of the smelting flue gas, the temperature of the cooling flue gas is lower than 40°C;

[0065] (2) The ammonium sulfide solution with a mass percentage concentration of 4% is atomized through the vortex nozzle in the absorption tower, and the smelting flue gas is purified and absorbed through the atomized ammonium sulfide solution, and the purified flue gas is discharged to absorb SO 2 The rich solution with heavy metals enters the self-redox reactor, and the rich solution is treated in the reactor for 25 minutes. During this process, metal sulfides such as mercury, lead, arseni...

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Abstract

The invention discloses a method for recycling sulfur dioxide (SO2) and heavy metal in metallurgical gas, and the method is characterized in that after the metallurgical gas is pretreated, the SO2 and the heavy metal in the smoke can be simultaneously removed by utilizing ammonium sulfide solution, and the heavy metal and a sulfuric product are recycled; and the method is simple and easy to operate, high in desulphurization rate, low in cost and applicable to the industrialized use.

Description

technical field [0001] The invention relates to a method for SO in smelting flue gas 2 The invention discloses a method for recycling and utilizing heavy metals, and belongs to the technical field of environmental protection. Background technique [0002] my country's non-ferrous metal smelting industry is developing rapidly. During the "Eleventh Five-Year Plan" period, the output of ten non-ferrous metals in my country has an average annual growth rate of 13.8%. The output of ten typical non-ferrous metals has ranked first in the world for many years. Among them, the production of zinc and lead And the scale of consumer demand in the world accounted for more than 40%, making an important contribution to my country's economic development. [0003] Non-ferrous smelting flue gas comes from the processes of concentrate drying, roasting, sintering, smelting, and extinguishing refining. The amount of flue gas produced depends on the type of metallurgical furnace and different ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/64B01D53/96C01B17/04C01C1/24
CPCB01D2251/206B01D2251/608B01D2258/025B01D53/64C01B17/05C01C1/24B01D53/96B01D53/78B01D53/50B01D53/507C01B17/20
Inventor 宁平殷在飞王学谦
Owner KUNMING UNIV OF SCI & TECH
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