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A method for reducing sulfur trioxide in nonferrous smelting flue gas by using metal sulfide reduction

A metal sulfide and smelting flue gas technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of large consumption of reducing agent, poor reduction selectivity, high cost, etc., and achieve easy industrial application and high reduction rate High, easily accessible effects

Active Publication Date: 2021-05-18
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the defects of the prior art, such as large consumption of reducing agent, poor reduction selectivity and high cost in the process of removing sulfur trioxide from non-ferrous smelting flue gas, the purpose of the present invention is to provide a method for reducing non-ferrous metals by using metal sulfide as a reducing agent. A method for smelting sulfur trioxide in flue gas. The method has good selectivity for sulfur trioxide reduction, high reduction efficiency, and metal sulfides are easy to recycle and reuse, and the consumption is low, which is beneficial to industrial production

Method used

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  • A method for reducing sulfur trioxide in nonferrous smelting flue gas by using metal sulfide reduction

Examples

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Effect test

Embodiment 1

[0030] Use zinc sulfide concentrate powder as a reducing agent (total sulfur is 29.88%, zinc content is 54.87%, particle size is -200 mesh), it is added into the silo, and is transported to the top of the reduction reaction tower by a feeder to feed The feed nozzle is used to disperse it into the reduction tower under the action of the nozzle, and the feeding speed is 8.09t / h (35 times). Then, the flue gas (SO 2 12.47-14.52%, SO 3 0.64-0.71%, the temperature is 182-196 ℃), the control flue gas flow is 3.2-3.6 million m 3, so that its residence time in the tower is 45s. The flue gas after the reaction is led out from the top of the tower, and after dust collection by the cyclone, the flue gas of acid making is obtained. During operation, in addition to detecting the flue gas flow and temperature, it is also necessary to regularly discharge slag and replenish new zinc sulfide concentrate powder. The obtained slag can be used in boiling roasting process or wet leaching proces...

Embodiment 2

[0035] Use zinc sulfide concentrate powder as the reducing agent (total sulfur is 31.45%, zinc content is 57.28%, particle size is -180 mesh), it is added into the silo, and is transported to the top of the reduction reaction tower by the feeder. The feed nozzle is used to disperse it into the reduction tower under the action of the nozzle, and the feeding speed is 11.87t / h (40 times). Then, the flue gas (SO 2 18.56-19.51%, SO 3 0.82-0.91%, the temperature is 292-318 ℃), the control flue gas flow rate is 34,000-35,000 m 3 , so that its residence time in the tower is 36s. The flue gas after the reaction is led out from the top of the tower, and after dust collection by the cyclone, the flue gas of acid making is obtained. During operation, in addition to detecting the flue gas flow and temperature, it is also necessary to regularly discharge slag and replenish new zinc sulfide concentrate powder. The obtained slag can be used in boiling roasting process or wet leaching proc...

Embodiment 3

[0040] Use copper sulfide concentrate powder as the reducing agent (total sulfur is 32.31%, copper content is 22.52%, particle size is -325 mesh), it is added into the silo, and is transported to the top of the reduction reaction tower through the feeder. The feed nozzle is used to disperse it into the reduction tower under the action of the nozzle, and the feeding speed is 6.24t / h (24 times). Then, the flue gas (SO 2 27.89-29.33%, SO 3 1.23-1.41%, the temperature is 92-127 ℃), the control flue gas flow rate is 18,000-22,000 m 3 , so that the residence time in the tower is 80s. The flue gas after the reaction is led out from the top of the tower, and after dust collection by the cyclone, the flue gas of acid making is obtained. During operation, in addition to detecting the flue gas flow and temperature, it is also necessary to regularly discharge slag and replenish new zinc sulfide concentrate powder. The obtained slag can be used in boiling roasting process or wet leachi...

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Abstract

The invention relates to a method for reducing sulfur trioxide in non-ferrous smelting flue gas by utilizing metal sulfide reduction. The method uses powdery metal sulfide as a reducing agent and sprays it into a reaction tower to make the metal sulfide particles and the flue gas The sulfur trioxide is fully contacted, so that the sulfur trioxide is completely reduced to sulfur dioxide. This method can avoid the formation of a large amount of foul acid due to the dissolution of sulfur trioxide during the acid-making flue gas scrubbing process, while improving the yield of sulfuric acid, and metal sulfides. The reducing agent has the advantages of high utilization rate, low cost, simple process, no special equipment requirements, high economic and environmental benefits, and good prospects for industrial application.

Description

technical field [0001] The invention relates to a treatment method for nonferrous smelting flue gas, in particular to a method for reducing sulfur trioxide in nonferrous smelting flue gas to sulfur dioxide by using metal sulfides to reduce the generation of dirty acid, and belongs to the technical field of nonferrous metallurgical flue gas treatment. Background technique [0002] Flue gas is one of the main by-products of the non-ferrous smelting process, and its main components are sulfur dioxide, sulfur trioxide, oxygen, nitrogen and soot. Because it is rich in sulfur dioxide and sulfur trioxide, the smelting flue gas is sent to the acid production process to produce sulfuric acid after waste heat recovery, cooling and dust removal, washing and purification. Among them, flue gas washing and purification uses water as a detergent to capture fluorine, chlorine and other impurity ions and ultra-fine dust in the flue gas, and sulfur dioxide is almost insoluble in water, so as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/83B01D53/50
CPCB01D53/508B01D53/83B01D2258/025B01D2258/0283
Inventor 李玉虎徐志峰马艳丽曹才放李云田磊严康
Owner JIANGXI UNIV OF SCI & TECH
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