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Method for efficiently desulfurizing and recycling sulfur resources by combining manganese ion aqueous solution with NOx

An aqueous solution, manganese ion technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as wear and restriction, achieve good effect, less addition, and improve the effect of recycling

Pending Publication Date: 2021-12-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent 201610926562.8 discloses a pyrolus pulp to remove SO from flue gas 2 A method and device for resource utilization thereof, using manganese ore slurry to remove SO in flue gas 2 , while SO 2 Redox reaction with manganese dioxide in manganese ore produces manganese sulfate, and high value-added manganese sulfate monohydrate and manganese carbonate are obtained through purification, evaporation crystallization and carbonization of mother liquor, but this method is limited to manganese ore processing enterprises, and There are problems such as wear and tear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A manganese ion aqueous solution combined with NO x A method for efficient desulfurization and recovery of sulfur resources, comprising the following steps:

[0034] (1) Weigh a certain mass of manganese sulfate and add it into a bubbling reactor with 250 mL of water, and mix evenly by stirring, so that Mn 2+ The mass concentration in water is 0.005 g / L, and it is prepared as an aqueous solution of manganese ions.

[0035] (2) The coal-fired flue gas is introduced into the bubbling reactor and absorbed by the manganese ion aqueous solution. Before coal-fired flue gas enters the bubble reactor, SO 2 The concentration is 2000 mg / Nm 3 , the oxygen content is 8 vol%, NO X The concentration is 30 mg / Nm 3 , the total flow rate of flue gas is 500mL / min, the temperature of manganese ion aqueous solution is 65 ℃, and the stirring intensity is 800 r / min.

[0036] (3) Determination of SO in the flue gas at the outlet of the bubble reactor 2 and NO x concentration, calculat...

Embodiment 2

[0038] A manganese ion aqueous solution combined with NO x A method for efficient desulfurization and recovery of sulfur resources, comprising the following steps:

[0039] (1) Weigh a certain mass of manganese sulfate and add it into a bubbling reactor with 250 mL of water, and mix evenly by stirring, so that Mn 2+The mass concentration in water is 0.1 g / L, and it is prepared as an aqueous solution of manganese ions.

[0040] (2) The coal-fired flue gas is introduced into the bubbling reactor and absorbed by the manganese ion aqueous solution. Before coal-fired flue gas enters the bubble reactor, SO 2 The concentration is 2500 mg / Nm 3 , the oxygen content is 10 vol%, NO X The concentration is 900 mg / Nm 3 , the total flow rate of flue gas is 500 mL / min, the temperature of manganese ion aqueous solution is 45 ℃, and the stirring intensity is 800 r / min.

[0041] (3) Determination of SO in the flue gas at the outlet of the bubble reactor 2 and NO x concentration, calculat...

Embodiment 3

[0043] A manganese ion aqueous solution combined with NO x A method for efficient desulfurization and recovery of sulfur resources, comprising the following steps:

[0044] (1) Weigh a certain mass of manganese sulfate and add it into a bubbling reactor with 250 mL of water, and mix evenly by stirring, so that Mn 2+ The mass concentration in water is 0.8 g / L, and it is prepared as an aqueous solution of manganese ions.

[0045] (2) The coal-fired flue gas is introduced into the bubbling reactor and absorbed by the manganese ion aqueous solution. Before coal-fired flue gas enters the bubble reactor, SO 2 The concentration is 1200 mg / Nm 3 , the oxygen content is 10 vol%, NO X The concentration is 200 mg / Nm 3 , the total flow rate of flue gas is 500 mL / min, the temperature of manganese ion aqueous solution is 20 ℃, and the stirring intensity is 800 r / min.

[0046] (3) Determination of SO in the flue gas at the outlet of the bubble reactor 2 and NO x concentration, calcula...

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Abstract

The invention provides a method for efficiently desulfurizing and recycling sulfur resources by combining a manganese ion aqueous solution with NOx, and belongs to the field of industrial tail gas desulfurization and denitrification. Flue gas is introduced into a manganese ion aqueous solution for desulfurization, the flue gas contains O2, SO2 and NOx, and the manganese ion aqueous solution contains Mn<2+>. Mn<2+> can significantly reduce the activation energy of S (IV) to generate SO3<->, promote the formation of SO4<->, SO5<->, HSO5<-> and OH<-> active oxidizing substances, and further catalytically oxidize S (IV) to convert into S (VI), NOx in flue gas reacts with S(IV) to further induce the generation of SO3 <-> and improve the yield of SO3 <->, and further induce a series of active species such as SO4 <-> to oxidize S (IV) into S (VI), so that the desulfurization rate is improved, and meanwhile, the oxidatively active species oxidize the conversion of NOx to HNO3.

Description

technical field [0001] The invention relates to the technical field of desulfurization and denitrification of industrial tail gas, in particular to a method for recovering sulfur resources through efficient desulfurization of manganese ion aqueous solution combined with NOx. Background technique [0002] my country's resource endowment determines the dominant position of coal in the primary energy supply, and the sulfur dioxide (SO 2 ) and nitrogen oxides (NO x ) and other flue gas pollutants cause frequent environmental problems. At present, the wet limestone-gypsum method is the most widely used desulfurization technology. Although the desulfurization cost of this method is low, the amount of by-product gypsum is huge, about 95 million tons per year. The large amount of stockpiling has caused new environmental pollution, and only realized the secondary transfer of pollutants. In addition, some ions produced during the decomposition of limestone dissolve into water, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/79B01D53/60
CPCB01D53/79B01D53/60Y02A50/20
Inventor 聂云祥梅毅杨一帆夜晨王旭君何德东祖运何宾宾翟持徐磊
Owner KUNMING UNIV OF SCI & TECH