Integrated device and method for removing sulfur oxide and heavy metal in non-ferrous metal smelting and acid-making flue gas

Abstract

The invention discloses an integrated device and method for removing sulfur oxide and heavy metal in non-ferrous metal smelting and acid-making flue gas. The integrated device comprises a gas inlet flue, a heat exchanger, a U-shaped flue, a venturi tube bundle, a circulating fluidized bed reactor and a dust remover, which are connected in sequence; the acid-making flue gas enters the heat exchanger from the gas inlet flue and enters a U-shaped pipeline through the heat exchanger from top to bottom; then the acid-making flue gas enters the venturi tube bundle through the U-shaped pipeline frombottom to top and enters the fluidized bed reactor from the venturi tube bundle; finally, the acid-making flue gas is subjected to dust removal through the dust remover and then is exhausted. According to the device disclosed by the invention, the temperature of the flue gas can be flexibly controlled according to the acid dew point of the flue gas and SO3 is selectively absorbed; meanwhile, impurities including dust, arsenic, fluorine, mercury and the like are captured and the purification efficiency is high; the quality of the acid-making flue gas can be ensured; a system has a simple structure and a small occupied area; resource utilization of byproducts can be directly realized and no secondary pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of purifying flue gas of sulfur oxides in nonferrous metal smelting, and specifically relates to an integrated device for removing sulfur oxides and heavy metals in the flue gas of acid production in nonferrous metal smelting. Background technique [0002] Non-ferrous metal smelting flue gas usually contains high concentration of SO 2 , also contains a large amount of SO 3 , heavy metals and other pollutants. Traditional dynamic wave washing and purification technology has low purification efficiency for heavy metals such as mercury, and at the same time produces a large amount of dirty acid. The main components include arsenic, mercury, lead, zinc, copper, etc., and the concentration of pollutants is high. The cost is extremely high; and after washing, a large amount of acid mist is generated, and the acid mist must be purified by an electric demister, which is complicated in process and high in equipment...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the traditional acid-making flue gas wet scrubbing and purification technology, such as complex system, secondary pollution by dirty acid, and low efficiency of coordinated removal of heavy metals, the present invention proposes a method for removing sulfur oxides and An integrated device for heavy metals. This integrated device adopts an orderly combination of several removal units, which can make full use of zinc oxide, a by-product of smelting. The by-product zinc sulfate can be directly sent to the electrolysis process to produce zinc ingots, which has a high Removal efficiency and strong economy

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