Method and system for wet dearsenification of smelting flue gas

A technology of smelting flue gas and wet method, which is applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of low arsenic grade, blockage of dust collector bag, difficult treatment, etc. The effect of reduced dosage and simple treatment process

Inactive Publication Date: 2021-02-19
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Abstract
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Problems solved by technology

[0004] However, due to the existence of a certain amount of SO in the smelting flue gas 3 , the flue gas dew point temperature is about 200 ℃ higher, which is in the temperature range of the quenching tower, so a large amount of condensed acid and arsenic trioxide condense out in the tower, causing problems such as bag blockage of the dust collector and equipment corrosion
Similar companies generally use the method of spraying alkali solution (NaOH or CaO) in the tower to condense and precipitate As 2 o 3 while removing SO from the flue gas 3 , but they all have problems to varying degrees: Using NaOH to remove SO 3 The cost of reagents is high, and CaO is used to remove SO 3 Then a large amount of calciu...

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  • Method and system for wet dearsenification of smelting flue gas

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Embodiment 1

[0062] like figure 2 As shown, the arsenic-containing flue gas treatment process in this embodiment is composed of a high-acid washing system, a dilute acid washing system, an electric demisting system, a low-arsenic waste liquid treatment system and a high-arsenic waste liquid treatment system.

[0063] (1) High-acid washing system: arsenic-containing smelting flue gas b is adiabatically evaporated and cooled in U-shaped washing tower 1 (about 50% concentrated sulfuric acid cycle washing) and SO is removed 3 (The liquid-gas ratio is 5L / Nm 3 ), the flue gas temperature is reduced from about 350°C to 120°C, and about 30% As in the flue gas 2 o 3 Desublimation and precipitation, into the washing solution, only a small amount of As due to solubility limitations 2 o 3 dissolved, containing a large amount of undissolved As 2 o 3 The solid high-acid washing slurry enters the high-acid circulation tank 2, and then 10% open circuit enters the high-acid cooling tank 3, cools to ...

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Abstract

The invention belongs to the technical field of flue gas dearsenification, and particularly relates to a method and a system for wet dearsenification of smelting flue gas. The method for wet dearsenification of smelting flue gas comprises the following steps of: washing the smelting flue gas with high-concentration sulfuric acid so as to remove most of sulfur trioxide; and washing the flue gas washed by the high-concentration sulfuric acid with low-concentration sulfuric acid so as to remove most As2O3; wherein the mass fraction of sulfuric acid in the high-concentration sulfuric acid is 40% or above, and the mass fraction of sulfuric acid in the low-concentration sulfuric acid is 20% or below. The method for wet dearsenification of smelting flue gas has the advantages of small hazardous waste residue amount, low agent consumption, low treatment cost and high purity of main arsenic products.

Description

technical field [0001] The invention belongs to the technical field of arsenic removal from flue gas, and in particular relates to a method and system for wet arsenic removal of smelting flue gas. Background technique [0002] During pyrometallurgy of arsenic-containing metal ore (As%≥0.5%), most of the arsenic in the concentrate enters the flue gas, and this part of arsenic must be removed before the flue gas enters the acid system to avoid adverse effects on subsequent acid production Impact, reduce the amount of waste acid containing arsenic in the flue gas purification system. [0003] At present, there are two types of arsenic removal technologies for non-ferrous smelting flue gas: dry arsenic removal and wet arsenic removal. The dry arsenic collection technology uses the flue gas quenching operation to condense arsenic trioxide into a solid state, and then enters the bag filter to complete the gas-solid separation. Pure As 2 o 3 . The arsenic removal efficiency of ...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50B01D53/46
CPCB01D53/78B01D53/507B01D53/46B01D2258/0283B01D2251/506
Inventor 袁朝新李大江郭持皓梁东东
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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