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A method for suppressing the production of sulfur trioxide in flue gas from heavy non-ferrous metal smelting acid production

A non-ferrous metal, sulfur trioxide technology, applied in chemical instruments and methods, separation methods, non-metallic elements, etc., can solve the problems of insignificant actual effect, large consumption of hydrogen sulfide, inappropriate sulfur trioxide, etc., to avoid Catalytic oxidation, low cost, high utilization effect

Active Publication Date: 2021-08-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that hydrogen sulfide is easy to react with oxygen in the flue gas. Due to the high oxygen content in the flue gas, the consumption of hydrogen sulfide is too large. In addition, hydrogen sulfide is a highly toxic substance, and the reliability of its source is limited. There are also very big problems with the economy
Recently, some researches have also attempted to suppress the production of sulfur trioxide by spraying iron sulfide ore into the furnace tail, but because iron sulfide is solid and its decomposition temperature is high, the actual effect is not significant, especially in the flue gas cooling process Among them, the reducing gas components produced by it cannot suppress the effect of soot on SO 2 catalytic conversion of
For the SO produced in the flue gas 3 , Chinese patent CN 106861375A discloses a method of spraying a base absorbent into the flue to eliminate sulfur trioxide in flue gas. 3 while also adding part of the SO 2 Removal, due to SO in non-ferrous smelting flue gas 2 It is also necessary to carry out acid production in the follow-up process, which consumes a large amount of SO 2 , so it is not suitable for the treatment of sulfur trioxide in non-ferrous smelting flue gas

Method used

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  • A method for suppressing the production of sulfur trioxide in flue gas from heavy non-ferrous metal smelting acid production

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Experimental program
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Effect test

Embodiment 1

[0029] A method for suppressing the production of sulfur trioxide in the flue gas of heavy nonferrous metal smelting acid production, aiming at the high concentration of SO produced by the combustion of nonferrous metal sulfide ores in smelting or roasting furnaces 2 Flue gas, using CS 2 Inject the flue gas for the reducing agent to suppress SO at an appropriate temperature 3 The method of producing and converting part of the heavy metal components into easy-to-remove sulfides.

[0030] The temperature of the flue gas at the tail of the roasting furnace is 800-1200°C, and then go through the basic treatment procedures such as waste heat boiler, cyclone dust collector, electrostatic precipitator, washing and cooling, and flue gas acid production.

[0031] Liquid CS 2 After being vaporized by the heating evaporator, dilute it with nitrogen or water vapor to a concentration of 1-10%, and spray it into a suitable flue section with a gas nozzle under a certain pressure.

[0032]...

Embodiment 2

[0039] A copper smelting flue gas, the waste heat boiler outlet flue gas volume is 70000Nm 3 / h, inlet temperature 1100±100℃, outlet temperature 350±30℃, flue gas SO at the outlet of electrostatic precipitator 2 Concentration is 10%, SO 3 The concentration is 0.5%, and the waste heat boiler is an integral type. In the flue and boiler before entering the waste heat boiler, 7 nozzles are installed at the position where the flue gas temperature is 700 ° C, and 10% CS is configured. 2 gas, using N 2 Injected into the flue as a carrier gas, the injection volume is 1400m 3 / h, SO in the flue gas at the outlet of the electrostatic precipitator 3 600ppm.

Embodiment 3

[0041] A lead smelting flue gas volume is 60000Nm 3 / h, the flue gas first flows out of the tail of the roaster with a temperature of 900-1100 ° C, the outlet temperature is 320-380 ° C, and then passes through the waste heat boiler, cyclone dust collector and electric dust collector in sequence, and finally undergoes washing and cooling and flue gas acid production. .

[0042] Liquid CS 2 After gasification, the N 2 Dilute it as a diluent gas to a volume concentration of 10%, and finally spray it into the flue section with a temperature of 800°C before the inlet of the waste heat boiler, and mix it with flue gas to suppress the production of sulfur trioxide. Using single-stage injection, a total of 6 injection points are evenly arranged on the flue section according to the principle of equal area division, and the injection volume is 960m 3 / h.

[0043] Without spraying CS 2 When, the electrostatic precipitator outlet SO 2 Concentration is 8%, SO 3 Concentration of 0.3...

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Abstract

The invention relates to a method for suppressing the generation of sulfur trioxide in the flue gas of acid-making smelting of heavy nonferrous metals. Carbon disulfide is used as a reducing agent to suppress the generation of sulfur trioxide. Add a certain concentration of CS 2 gas for this purpose. Its principle of action is to use the injected CS 2 Gas pairs with catalytic SO 2 form SO 3 The effect of the dust surface to compete with the reaction, thereby inhibiting the SO 2 Catalytic oxidation to produce SO 3 ; additional CS 2 It is also possible to directly put the SO 3 Revert to SO 2 . Eliminate SO through the above effects 3 the goal of. Compared with the prior art, the present invention has the advantages of simple operation, low cost and high efficiency, and does not consume SO in the flue gas during the elimination process 2 The production of sulfuric acid is reduced, and there will be no secondary pollution such as waste water and residue.

Description

technical field [0001] The invention relates to the field of environmental protection in nonferrous smelting, in particular to a method for suppressing the generation of sulfur trioxide in flue gas of acid production in heavy nonferrous metal smelting. Background technique [0002] During the high-temperature smelting process of heavy non-ferrous metal sulfide ores (zinc sulfide ore, copper sulfide ore, lead sulfide ore, etc.), sulfur is mainly released into the flue gas in the form of sulfur dioxide, and the flue gas is used for acid production after pretreatment. Containing SO from the smelting furnace 2 Since the flue gas also contains oxygen at the same time, during its cooling process, there will be a part of SO 2 Oxidized to SO under the catalysis of mine dust 3 . while SO 3 It is highly corrosive and is a gas that is extremely harmful to the smelting process. Mainly manifested in the following aspects: First, SO 3 It will produce a "blue feather" phenomenon at t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/76B01D53/64B01D53/50B01D50/00C01B17/50
CPCB01D50/00B01D53/50B01D53/64B01D53/76B01D2258/0283C01B17/502C01B17/508Y02P20/129
Inventor 晏乃强瞿赞刘伟孙小明李叔唐
Owner SHANGHAI JIAO TONG UNIV
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