Method of utilizing copper smelting slag to remove SO2, NOx and Hg in nonferrous smelting flue gas

A technology for smelting flue gas and copper smelting slag, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of many types of additives, complex absorbent components, complex waste liquid components, etc. The effect of economic benefit, simple preparation method and low energy consumption

Inactive Publication Date: 2016-07-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN102091517A discloses an integrated absorption solution for simultaneous desulfurization, denitrification and mercury removal, which is an improvement to the existing alkaline desulfurization absorption solution, and uses a mixed absorption solution containing nitrogen-containing reducing agent + additive to wash and remove SO in flue gas 2 , NO X and Hg, these methods have the main problem that the composition of the absorbent is complex, and there are many types of additives used, the waste liquid produced is complex and difficult to handle

Method used

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  • Method of utilizing copper smelting slag to remove SO2, NOx and Hg in nonferrous smelting flue gas
  • Method of utilizing copper smelting slag to remove SO2, NOx and Hg in nonferrous smelting flue gas
  • Method of utilizing copper smelting slag to remove SO2, NOx and Hg in nonferrous smelting flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dry the medium ore from Yunxi Copper Industry at 80°C, then grind and sieve it into 200-400 mesh; mix the obtained copper slag powder with tap water in a certain proportion, and the solid content of the mixed copper slag slurry is the mass The percentage is 15%; the gas is passed through the gas absorption bottle containing copper slag slurry; the amount of copper slag slurry is 25mL; 2 The concentration is 1000mg / L, the NO concentration is 300mg / L, and the Hg concentration is 30mg / L. The simultaneous removal effect of three kinds of pollutants is shown in figure 1 As shown, it can be seen from the figure that when the middle ore of Yunnan Copper Industry is selected to make copper slag slurry with a solid content of 15%, it is measured that within 90 minutes of absorption, SO in the flue gas 2 Concentration 2 The average removal rate is >98%, the average NO removal rate is >70%, and the average Hg removal rate is >80%.

Embodiment 2

[0025] Dry the medium ore from Yunxi Copper Industry at 90°C, then grind and sieve it into 300-400 mesh; mix the obtained copper slag powder with tap water in a certain proportion, and the solid content of the mixed copper slag slurry is the mass The percentage is 45%; the gas is passed through the gas absorption bottle containing copper slag slurry; the amount of copper slag slurry is 25mL; 2 The concentration is 1300mg / L, the NO concentration is 400mg / L, and the Hg concentration is 40mg / L. The simultaneous removal effect of three kinds of pollutants is shown in figure 2 As shown, it can be seen from the figure that when the middle ore of Yunnan Copper Industry is selected to make copper slag slurry with a solid content of 45%, it is measured that within 90 minutes of absorption, SO in the flue gas 2 Concentration 2 The average removal rate is >99%, the average NO removal rate is >75%, and the average Hg removal rate is >90%.

Embodiment 3

[0027] Dry the medium ore from Yunxi Copper Industry at 100°C, then grind and sieve it into 200-300 meshes; mix the obtained copper slag powder with tap water in a certain proportion, and the solid content of the mixed copper slag slurry is the mass The percentage is 60%; the gas is passed through the gas absorption bottle containing copper slag slurry; the amount of copper slag slurry is 25mL; 2 The concentration is 1500mg / L, the NO concentration is 500mg / L, and the Hg concentration is 50mg / L. The simultaneous removal effect of three kinds of pollutants is shown in image 3 As shown, it can be seen from the figure that when the middle ore of Yunnan Copper Industry is selected to make copper slag slurry with a solid content of 60%, it is measured that within 90 minutes of absorption, SO in the flue gas 2 Concentration 2 The average removal rate is >95%, the average NO removal rate is >75%, and the average Hg removal rate is >90%.

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Abstract

The invention discloses a method of utilizing copper smelting slag to remove SO2, NOx and Hg in nonferrous smelting flue gas. The method includes: using copper slag slurry prepared from the copper smelting slag as an absorbent to perform liquid-phase catalytic oxidation of SO2, NOx and Hg in the nonferrous smelting flue gas at normal temperature and normal pressure to achieve the objective of removing SO2, NOx and Hg in the nonferrous smelting flue gas. Oxidation of SO2, NOx and Hg is realized through catalytic oxidation action of metal oxide and transition metal ions contained in the copper smelting slag. The method is simple, raw materials are extremely large in reserve volume, easy to get, low in cost, easy for industrialized application and good in removal effect, and the objective of using waste to treat waste so as to realizing clean production can be achieved.

Description

technical field [0001] The invention belongs to the field of industrial waste gas treatment, and relates to a method for utilizing copper smelting slag to desulfurize, denitrify and demercurize simultaneously. Background technique [0002] my country's nonferrous metal smelters mostly use sulfide concentrates as raw materials when producing copper, aluminum, zinc and other major nonferrous metals, and produce a large amount of SO in the process of pyrometallurgy. 2 flue gas, in addition, a large amount of NO is also produced under high temperature and high oxygen smelting conditions X , some non-ferrous heavy metal ores contain high mercury content, resulting in high mercury content in smelting flue gas. The non-ferrous metal smelting industry has become one of the main pollution sources of mercury emissions in my country, and its contribution accounts for 40% of my country's non-intentional atmospheric mercury emissions. about. SO in non-ferrous smelting flue gas 2 , NO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/60B01D53/64
CPCB01D53/8637B01D53/8665B01D2258/0283Y02A50/20
Inventor 宁平刘娜李凯孙鑫王学谦张贵剑刘烨孙丽娜
Owner KUNMING UNIV OF SCI & TECH
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