NL2032088B1 - Method and system for wet-process removal of sulfur dioxide by electric furnace steelmaking dust - Google Patents

Method and system for wet-process removal of sulfur dioxide by electric furnace steelmaking dust Download PDF

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NL2032088B1
NL2032088B1 NL2032088A NL2032088A NL2032088B1 NL 2032088 B1 NL2032088 B1 NL 2032088B1 NL 2032088 A NL2032088 A NL 2032088A NL 2032088 A NL2032088 A NL 2032088A NL 2032088 B1 NL2032088 B1 NL 2032088B1
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slurry
electric furnace
dust
suspension
furnace steelmaking
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NL2032088A
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NL2032088A (en
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Wang Fang
Gao Jiyun
Jia Lijuan
Xie Binghua
Ning Ping
Ma Linzhuan
Liu Tiancheng
Yu Qian
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Univ Yunnan Minzu
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/507—Sulfur oxides by treating the gases with other liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/80—Semi-solid phase processes, i.e. by using slurries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8603—Removing sulfur compounds
    • B01D53/8609—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/102—Oxygen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/602—Oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/2073—Manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20738—Iron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

Provided are a method and system for wet—process removal of sulfur dioxide by electric furnace steelmaking dust. The method for wet— process removal of sulfur dioxide by electric furnace steelmaking dust includes the following steps: mixing electric furnace steelmaking dust with water to obtain electric furnace steelmaking dust slurry; and mixing industrial flue gas, oxygen and nitrogen to obtain mixed gas, and introducing the mixed gas into the electric furnace steelmaking dust slurry for desulfurization. In the desulfurization. process, Fe and, Mn in the electric furnace steelmaking dust are leached, and the leached Fe3+ and Mn2+ can be used as catalysts to catalyze and oxidize sulfur dioxide, so that long—time high—efficiency' desulfurization. is achievedJ Moreover, the process is simple, resource utilization of solid waste electric furnace dust generated, in the electric furnace steelmaking process is achieved, waste is treated with waste, cost is low, and secondary pollution is avoided.

Description

METHOD AND SYSTEM FOR WET-PROCESS REMOVAL OF SULFUR DIOXIDE BY
ELECTRIC FURNACE STEELMAKING DUST
TECHNICAL FIELD
The present invention relates to the technical field of desulfurization, and in particular to a method and system for wet- process removal of sulfur dioxide by electric furnace steelmaking dust.
BACKGROUND ART
Sulfur dioxide gas is usually contained in the exhaust gas of ore smelting industry, sulfuric acid industry or coal-fired and oil-fired boilers. Sulfur dioxide emissions not only affect the air quality and endanger human health, but also is the direct cause of acid rain. Acid rain also has a great harm to human be- ings. It affects the ecological balance, acidifies lakes, destroys the living environment of aquatic organisms, kills trees and crops, and corrodes buildings. Therefore, desulfurization of in- dustrial flue gas to control and reduce sulfur dioxide emissions in the atmosphere is commonly concerned by people. CN110559818A discloses a flue gas desulfurization method by using zinc hypoxide dust as a desulfurizer, including a slurrying process, an oxygen- rich preparation process, a foam desulfurization process, a post- desulfurization slurry filtration process, a purification and im- purity removal process, and a concentration and crystallization process. However, the method features complex process and high cost.
SUMMARY
In view of this, the present invention is intended to provide a method and system for wet-process removal of sulfur dioxide by electric furnace steelmaking dust, and the method features high desulfurization rate, simple process and low cost.
To achieve the aforesaid purpose, the present invention pro- vides the following technical solutions:
The present invention provides a method for wet-process re- moval of sulfur dioxide by electric furnace steelmaking dust, in- cluding the following steps: mixing electric furnace steelmaking dust with water to obtain electric furnace steelmaking dust slurry; and mixing industrial flue gas, oxygen and nitrogen to obtain mixed gas, and introducing the mixed gas into the electric furnace steelmaking dust slurry for desulfurization.
Preferably, the electric furnace steelmaking dust includes the following components based on mass percentages: 70-80% of
ZnFe;0;, 5-15% of ZnO, 95-12% of Fe;0, and 2-5% of Cao.
Preferably, a pH value of the electric furnace steelmaking dust slurry is 11-12.
Preferably, a mass-to-volume ratio of the electric furnace steelmaking dust to the water is (2-3.5) g:1 L.
Preferably, a concentration of SO: in the industrial flue gas is 1,500-2,500 mg/m’.
Preferably, a volume fraction of 0, in the mixed gas is 5- 20%.
Preferably, a flow rate of the industrial flue gas is 0.2-0.7
L/min.
Preferably, a temperature of the desulfurization is 35-75°C.
The present invention provides a system for wet-process re- moval of sulfur dioxide by electric furnace steelmaking dust, in- cluding a slurry preparation tank 1, a first slurry pump 2-1, a second slurry pump 2-2, a slurry tank 3, an absorber 6 and an air compressor 7; wherein the slurry tank 3 is provided with a first slurry in- let 3-1, a first slurry outlet 3-2 and a second slurry inlet 3-3; the absorber 6 is provided with a mixed gas inlet 6-1, an ex- haust gas outlet 6-2, slurry inlets 6-3 and a slurry outlet 6-4; a slurry outlet of the slurry preparation tank 1 is communi- cated with the first slurry inlet 3-1 of the slurry tank 3 through the first slurry pump 2-1; the first slurry outlet 3-2 of the slurry tank 3 is communi- cated with the slurry inlets 6-3 of the absorber 6 through the second slurry pump 2-2; the second slurry inlet 3-3 of the slurry tank 3 is communicated with the slurry outlet 6-4 of the absorber 6; and the air compressor 7 is communicated with the mixed gas inlet 6-1 of the absorber 6.
Preferably, the system further includes a heat exchanger 4 and a dust collector 5; wherein a flue gas outlet of the heat exchanger 4 is communi- cated with a flue gas inlet of the dust collector 5; and a flue gas outlet of the dust collector 5 is communicated with the mixed gas inlet 6-1 of the absorber 6.
The present invention provides a method for wet-process re- moval of sulfur dioxide by electric furnace steelmaking dust, in- cluding the following steps: mixing electric furnace steelmaking dust with water to obtain electric furnace steelmaking dust slur- ry; and mixing industrial flue gas, oxygen and nitrogen to obtain mixed gas, and introducing the mixed gas into the electric furnace steelmaking dust slurry for desulfurization. In the method, be- cause the electric furnace steelmaking dust contains a lot of al- kaline substances and has a large specific surface area, and also contains Fe, Mn and other elements; in the desulfurization pro- cess, SO: in the industrial flue gas has an acid-base neutraliza- tion reaction with the alkaline electric furnace steelmaking dust slurry; ZnO in the slurry reacts with SO, in the flue gas to gener- ate zinc sulfate; with continuous absorption of S50, by the electric furnace steelmaking dust slurry, the electric furnace steelmaking dust slurry becomes acidic, and Fe and Mn ions in the electric furnace steelmaking dust are leached; the Fe and Mn ions have a catalytic oxidation effect, which can catalyze and oxidize sulfite to sulfate radical, so that long-time high-efficiency desulfuriza- tion is achieved. The method is simple, resource utilization of solid waste electric furnace dust generated in the electric fur- nace steelmaking process is achieved, the disposal problem of electric furnace dust is solved, and the method is clean and envi- ronmentally friendly; by removing SO: from flue gas by the electric furnace dust slurry, the desulfurization cost is reduced; a pur- pose of “waste is treated with waste” is achieved through absorb- ing SO: by the electric furnace steelmaking dust, cost is low, and secondary pollution is avoided. Therefore, the method has high economic and environmental benefits.
The present invention provides a system for wet-process re- moval of sulfur dioxide by electric furnace steelmaking dust, in- cluding a slurry preparation tank 1, a first slurry pump 2-1, a second slurry pump 2-2, a slurry tank 3, an absorber 6 and an air compressor 7, wherein the slurry tank 3 is provided with a first slurry inlet 3-1, a first slurry outlet 3-2 and a second slurry inlet 3-3; the absorber 6 is provided with a mixed gas inlet 6-1, an exhaust gas outlet 6-2, slurry inlets 6-3 and a slurry outlet 6-4; a slurry outlet of the slurry preparation tank 1 is communi- cated with the first slurry inlet 3-1 of the slurry tank 3 through the first slurry pump 2-1; the first slurry outlet 3-2 of the slurry tank 3 is communicated with the slurry inlets 6-3 of the absorber 6 through the second slurry pump 2-2; and the second slurry inlet 3-3 of the slurry tank 3 is communicated with the slurry outlet 6-4 of the absorber 6. The system is simple and low- cost, and can realize continuous and efficient removal of sulfur dioxide from industrial flue gas.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram of a system for wet-process re- moval of sulfur dioxide by electric furnace steelmaking dust, where: 1 - slurry preparation tank; 2-1 - first slurry pump; 2-2 - second slurry pump; 3 - slurry tank; 4 - heat exchanger; 5 - dust collector; 6 - absorber; 6-1 - mixed gas inlet; 6-2 - exhaust gas outlet; 6-3 - slurry inlets; 6-4 - slurry outlet; 7 - air compres- sor; 8 - exhaust gas purification tank; 9-1 - first stirrer; 9-2 - second stirrer; 10 - flue gas analyzer; 11 - valve.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The present invention provides a method for wet-process re- moval of sulfur dioxide by electric furnace steelmaking dust, in- cluding the following steps: electric furnace steelmaking dust is mixed with water to ob- tain electric furnace steelmaking dust slurry; and industrial flue gas, oxygen and nitrogen are mixed to obtain mixed gas, and the mixed gas is introduced into the electric fur- nace steelmaking dust slurry for desulfurization.
In the present invention, unless otherwise specified, all raw material components are commercially available products known to 5 those skilled in the art.
In the present invention, electric furnace steelmaking dust is mixed with water to obtain electric furnace steelmaking dust slurry.
In the present invention, the electric furnace steelmaking dust preferably includes the following chemical components based on mass percentages: 70-80% of ZnFe:0,, 5-15% of ZnO, 9-12% of Fe:04 and 2-5% of Cao, and more preferably 75-78% of ZnFe:04, 10-12% of
Zn0, 10-11% of Fe:04 and 3-4% of CaO. There is no special limita- tion to a source of the electric furnace steelmaking dust, as long as the components can satisfy the above-mentioned requirements.
In the present invention, a mass-to-volume ratio of the elec- tric furnace steelmaking dust to the water is preferably (2-3.5) g:1 L, more preferably (2.2-3.3) g:1 L, and most preferably (2.5- 3) g:1 L; a pH value of the electric furnace steelmaking dust slurry is 11-12, preferably 11.2-11.8, and more preferably 11.5- 11.6.
In the present invention, after the electric furnace steelmaking dust slurry is obtained, industrial flue gas, oxygen and nitrogen are mixed to obtain mixed gas, and the mixed gas is introduced into the electric furnace steelmaking dust slurry for desulfurization.
There is no special limitation to the industrial flue gas, as long as sulfur dioxide is contained, such as boiler flue gas. In the present invention, a concentration of 30; in the industrial flue gas is preferably 1,500-2,500 mg/m’, more preferably 1,800- 2,200 mg/m’, and most preferably 2,000-2,100 mg/m’; a flow rate of the industrial flue gas is preferably 0.3-0.6 L/min, and more preferably 0.4-0.5 L/min. In the present invention, the industrial flue gas is preferably mixed with oxygen and nitrogen after heat exchange and dust removal. There is no special limitation to the heat exchange, as long as the heat exchange can reduce the temper- ature of the industrial flue gas to £40°C. The temperature of the industrial flue gas subjected to the heat exchange is more prefer- ably 20-40°C. There is no special limitation to the dust removal, and the dust removal operation known to those skilled in the art may be adopted, and the dust removal in industrial flue gas pre- vails. In the present invention, a SO; removal rate can be further improved and desulfurization equipment can be protected by the heat exchange and dust removal of industrial flue gas.
In the present invention, a volume fraction of O: in the mixed gas is preferably 5-20%, more preferably 8-18%, and most preferably 10-15%; a total flow rate of oxygen and nitrogen is preferably 0.3-0.6 L/min, and more preferably 0.4-0.5 L/min.
In the present invention, a temperature of the desulfuriza- tion is preferably 35-75°C, more preferably 40-70°C, and most pref- erably 50-60°C.
In the present invention, in the desulfurization process, the electric furnace steelmaking dust slurry is alkaline, and 30; in the industrial flue gas has an acid-base neutralization reaction with the alkaline electric furnace steelmaking dust slurry; ZnO in the slurry reacts with SO; in the flue gas to generate zinc sul- fate; with continuous absorption of 30; by the electric furnace steelmaking dust slurry, the electric furnace steelmaking dust slurry becomes acidic, and Fe and Mn ions in the electric furnace steelmaking dust are leached; the Fe and Mn ions have a catalytic oxidation effect, which can catalyze and oxidize sulfite to sul- fate radical. The main reactions in the desulfurization process are as follows: (1) Hydration of the electric furnace dust:
SHD
{2) Dissolution of SO: and ionization of H:SO;:
S0,(g) =80, (aq) 50: (aq) +H:0 (1) =H;80; (aq)
H»S0; (aq) ZHSO: (aq) +H (aq)
HSO" (aq) =q0:" (aq) +H" (aq) (3) Acid-base neutralization reaction in the electric furnace steelmaking dust slurry:
H*+OH —H,0
(4) Reaction of oxides in the electric furnace dust slurry with S0;:
M,0,+2H,S0,=M, (SO) ,+2H.0 7,0+S0,+5/2H,0-2,80, -5/2H,0} 7,0+280,+H,0-7, (HSO.) > 7.50.+41/20.-2,50,
Zs (HS03) 2+0,-2,S0,+H, SO, (5) Reaction of catalytic oxidation and absorption of SO, by
Fe and Mn ions:
THRO +, er SOI iste
SEE so”
In the present invention, exhaust gas and sulfur absorption slurry are obtained from the desulfurization. In the present in- vention, exhaust gas purification treatment is preferably per- formed after a concentration of sulfur dioxide in the exhaust gas is detected, and the exhaust gas is discharged after reaching a standard. In the present invention, the detection is preferably performed by the flue gas analyzer. In the present invention, the exhaust gas purification treatment is preferably solution absorp- tion, and a solution adopted in the solution absorption is prefer- ably a K;MnO, solution or a NaOH solution; a concentration of the
K,MnO, solution is preferably 0.05-0.2 mol/L, and more preferably 0.1 mol/L; a concentration of the NaOH solution is preferably 0.5- 2 mol/L, and more preferably 1 mol/L.
The present invention provides a system for wet-process re- moval of sulfur dioxide by electric furnace steelmaking dust, in- cluding a slurry preparation tank 1, a first slurry pump 2-1, a second slurry pump 2-2, a slurry tank 3, an absorber 6 and an air compressor 7.
The system provided by the present invention includes a slur- ry preparation tank 1, wherein the slurry preparation tank 1 is provided with a slurry outlet. In the embodiments of the present invention, a first stirrer 9-1 is preferably arranged in the slur- ry preparation tank 1; and the slurry preparation tank 1 is con- figured to prepare electric furnace steelmaking dust slurry.
The system further provided by the present invention further includes a slurry tank 3, wherein the slurry tank 3 is provided with a first slurry inlet 3-1, a first slurry outlet 3-2 and a second slurry inlet 3-3; and the first slurry inlet 3-1 is commu- nicated with the slurry outlet of the slurry preparation tank 1 through the first slurry pump 2-1. In the embodiments of the pre- sent invention, a second stirrer 9-2 is further preferably ar- ranged in the slurry tank 3; the second stirrer 9-2 is preferably a collecting thermostat heating magnetic stirrer; the collecting thermostat heating magnetic stirrer is configured to stir and heat slurry in the slurry tank 3; the heated slurry is pumped into an absorber 6, and a temperature in the absorber 6 is constant, so slurry is not liable to cool, and a desulfurization effect is im- proved.
The system provided by the present invention includes an ab- sorber 6, wherein the absorber 6 is provided with a mixed gas in- let 6-1, an exhaust gas outlet 6-2, slurry inlets 6-3 and a slurry outlet 6-4; the slurry inlets 6-3 of the absorber 6 are communi- cated with the first slurry outlet 3-2 of the slurry tank 3 through the second slurry pump 2-2; the slurry outlet 6-4 of the absorber 6 is communicated with the second slurry inlet 3-3 of the slurry tank 3. In the embodiments of the present invention, a num- ber of slurry inlets 6-3 is preferably 3. In the absorber 6, the mixed gas and the electric furnace steelmaking dust slurry flow in reverse, so that a desulfurization efficiency can be improved.
The system further includes an air compressor 7, wherein the air compressor 7 is communicated with the mixed gas inlet 6-1 of the absorber 6, configured to provide oxygen for industrial flue gas.
In the embodiments of the present invention, the system fur- ther preferably includes a heat exchanger 4, wherein the heat ex- changer 4 is configured to perform heat exchange on industrial flue gas until the temperature is <40°C.
In the embodiments of the present invention, the system fur- ther preferably includes a dust collector 5, wherein the dust col- lector is communicated with the heat exchanger 4 and the mixed gas inlet 6-1 of the absorber 6 respectively. There is no special lim-
itation to the dust collector 5, as long as the dust in the indus- trial flue gas can be removed.
In the embodiments of the present invention, the system fur- ther preferably includes a flue gas analyzer 10, wherein the flue gas analyzer 10 is provided with an exhaust gas inlet and an ex- haust gas outlet, and the exhaust gas inlet is preferably communi- cated with the exhaust gas cutlet 6-2 of the absorber 6 through a first pipe; a valve 11 is preferably arranged on the first pipe.
In the embodiments of the present invention, the system fur- ther preferably includes an exhaust gas purification tank 8, wherein the exhaust gas purification tank 8 is provided with an exhaust gas inlet and an exhaust gas outlet, and the exhaust gas inlet is communicated with the exhaust gas outlet 6-2 of the ab- sorber 6 and the exhaust gas outlet of the flue gas analyzer 10 respectively. In the embodiments of the present invention, a solu- tion in the exhaust gas purification tank 8 is preferably a K:MnO, solution or a NaOH solution; a concentration of the K;MnO; solution and a concentration of the NaOH solution are preferably the same with those in the above-mentioned technical solutions, which will not be repeated here.
The method for removing sulfur dioxide by using the device for wet-process removal of sulfur dioxide by electric furnace steelmaking dust of the present invention will be specifically de- scribed below in combination with FIG. 1. The method includes the following steps: electric furnace steelmaking dust and water are mixed in the slurry preparation tank 1 to obtain electric furnace steelmaking dust slurry; the electric furnace steelmaking dust slurry is pumped into the slurry tank 3 by the first slurry pump; industrial flue gas is mixed with oxygen and nitrogen provided by the air compressor after heat exchange by the heat exchanger 4 and dust removal by the dust collector 5 to obtain mixed gas; the mixed gas is transported to the absorber 6, and mixed in reverse with the electric furnace steelmaking dust slurry pumped into a top of the absorber 6 by the second slurry pump for desulfuriza- tion to obtain exhaust gas and sulfur absorption slurry; the ex- haust gas is transported to the exhaust gas purification tank 8 for purification after a concentration of sulfur dioxide is de-
tected by the flue gas analyzer 10, and then discharged; the sul- fur absorption slurry flows back into the slurry tank 3; when a pH value of the slurry in the slurry tank 3 is 2-3, the electric fur- nace steelmaking dust slurry in the slurry preparation tank 1 is replenished into the slurry tank 3 through the first slurry pump to add fresh electric furnace steelmaking dust slurry.
The technical solutions in the present invention will be de- scribed below clearly and completely in combination with embodi- ments. Apparently, the embodiments described herein only consti- tute a part of, rather than all of, the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts should fall within the protection scope of the present invention.
Example 1
The device as shown in FIG. 1 was adopted. Electric furnace steelmaking dust and distilled water were mixed in the slurry preparation tank 1 to obtain electric furnace steelmaking dust slurry; the electric furnace steelmaking dust slurry was pumped into the slurry tank 3 by the first slurry pump; wherein a solid- to-liquid mass ratio of the electric furnace steelmaking dust slurry was 2.5 g:1 L.
Industrial flue gas was mixed with oxygen and nitrogen pro- vided by the air compressor after heat exchange by the heat ex- changer 4 and dust removal by the dust collector 5 to obtain mixed gas; a concentration of SO; in the industrial flue gas was 2,500 mg/m’, and an volume fraction of 0, in the mixed gas was 10%; a flow rate of the industrial flue gas was 0.3 L/min, and a total flow rate of 0, and N; was 0.2 L/min.
The mixed gas was transported to the absorber 6, and mixed in reverse with the electric furnace steelmaking dust slurry pumped into a top of the absorber 6 by the second slurry pump for desul- furization to obtain exhaust gas and sulfur absorption slurry; wherein a temperature of the electric furnace steelmaking dust slurry was 45°C.
A concentration of S50; in the exhaust gas was detected by the flue gas analyzer 10, then the exhaust gas was transported to the exhaust gas purification tank 8 for purification, and then dis- charged; the sulfur absorption slurry flowed back into the slurry tank 3; when a pH value of the slurry in the slurry tank 3 was 2- 3, the electric furnace steelmaking dust slurry in the slurry preparation tank 1 was replenished into the slurry tank 3 through the first slurry pump to add fresh electric furnace steelmaking dust slurry.
Desulfurization results: A duration for a desulfurization rate of 100% was 580 min, and a duration of a desulfurization rate for more than 90% was 680 min.
Example 2
Sulfur dioxide removal was performed according to the method in example 1. The difference from example 1 lies in that a solid- to-liquid mass ratio of the electric furnace steelmaking dust slurry was 2 g:1 L. Desulfurization results: A duration for a desulfurization rate of 100% was 480 min, and a duration for a desulfurization rate of more than 90% was 580 min.
The foregoing are only the preferred embodiments of the pre- sent invention. It should be noted that those of ordinary skill in the art may also make some improvements and optimizations without departing from the principles of the present invention, and those improvements and optimizations should also be regarded to fall within the protection scope of the present invention.

Claims (10)

CONCLUSIESCONCLUSIONS 1. Werkwijze voor het verwijderen van zwaveldioxide via een nat proces door stof van de vervaardiging van staal in elektrische ov- ens, welke werkwijze de volgende stappen omvat: het mengen van stof van de vervaardiging van staal in elektrische ovens met water om een suspensie van stof van de vervaardiging van staal in elektrische ovens te verkrijgen; en het mengen van industrieel rookgas, zuurstof en stikstof om ge- mengd gas te verkrijgen, en het invoeren van het gemengde gas in de suspensie van stof van de vervaardiging van staal in el- ektrische ovens ten behoeve van ontzwaveling.A method for removing sulfur dioxide by a wet process from electric furnace steelmaking dust, the method comprising the steps of: mixing electric furnace steelmaking dust with water to form a slurry of to obtain dust from the manufacture of steel in electric furnaces; and mixing industrial flue gas, oxygen and nitrogen to obtain mixed gas, and introducing the mixed gas into the slurry of steelmaking dust into electric furnaces for desulfurization. 2. Werkwijze volgens conclusie 1, met het kenmerk, dat het stof van de vervaardiging van staal in elektrische ovens de volgende componenten omvat, gebaseerd op massapercentages: 70 tot 80% ZnFe:O4, 5 tot 15% ZnO, 2 tot 12% Fe:0: en 2 tot 5% Cao.A method according to claim 1, characterized in that the dust from steelmaking in electric furnaces comprises the following components, based on mass percentages: 70 to 80% ZnFe:O4, 5 to 15% ZnO, 2 to 12% Fe :0: and 2 to 5% Cao. 3. Werkwijze volgens conclusie 1, met het kenmerk, dat de pH- waarde van de suspensie van stof van de vervaardiging van staal in elektrische ovens 11 tot 12 is.Method according to claim 1, characterized in that the pH value of the suspension of dust from steelmaking in electric furnaces is 11 to 12. 4. Werkwijze volgens conclusie 1, waarbij een vast-tot-vloeistof massaverhouding van het stof van de vervaardiging van staal in el- ektrische ovens tot het water (2 tot 3,5) g:1L is.The method according to claim 1, wherein a solid-to-liquid mass ratio of the dust from steelmaking in electric furnaces to the water is (2 to 3.5) g:1L. 5. Werkwijze volgens conclusie 1, waarbij een S0;-concentratie in het industriële rookgas 1500 tot 2500 mg/m’ is.The method of claim 1, wherein an SO 2 concentration in the industrial flue gas is 1500 to 2500 mg/m 3 . 6. Werkwijze volgens conclusie 1 of 5, waarbij een volumefractie van 0: in het gemengde gas 5 tot 20% is.A method according to claim 1 or 5, wherein a volume fraction of 0: in the mixed gas is 5 to 20%. 7. Werkwijze volgens conclusie 1 of 5, waarbij een stroomsnelheid van het industriële rookgas 0,2 tot 0,7 l/min is.The method according to claim 1 or 5, wherein a flow rate of the industrial flue gas is 0.2 to 0.7 l/min. 8. Werkwijze volgens conclusie 1, waarbij een temperatuur van de ontzwaveling 35 tot 75 °C is.The method of claim 1, wherein a temperature of the desulfurization is 35 to 75°C. 9. Systeem voor de verwijdering van zwaveldioxide in het natte proces door stof van de vervaardiging van staal in elektrische ov- ens, omvattende een suspensiebereidingstank (1), een eerste sus- pensiepomp (2-1), een tweede suspensiepomp (2-2), een suspensi- etank (3), een absorber (6) en een luchtcompressor (7); waarbij de suspensietank (3) is voorzien van een eerste suspensie- inlaat (3-1), een eerste suspensie-uitlaat (3-2) en een tweede suspensie-inlaat (3-3); waarbij de absorber (6) is voorzien van een gemengd gasinlaat (6- 1), een uitlaatgasuitlaat (6-2), suspensie-inlaten (6-3) en een suspensie-uitlaat (6-4); waarbij een suspensie-uitlaat van de suspensiebereidingstank (1) in verbinding staat met de eerste suspensie-inlaat (3-1) van de suspensietank (3) via de eerste suspensiepomp (2-1); waarbij de eerste suspensie-uitlaat (3-2) van de suspensietank (3) in verbinding staat met de suspensie-inlaten (6-3) van de absorber {6) via de tweede suspensiepomp (2-2); waarbij de tweede suspen- sie-inlaat (3-3) van de suspensietank (3) in verbinding staat met de suspensie-uitlaat (6-4) van de absorber (6); en waarbij de luchtcompressor (7) in verbinding staat met de gemengd gasinlaat (6-1) van de absorber (6).A system for the removal of sulfur dioxide in the wet process by dust from steelmaking in electric furnaces, comprising a slurry preparation tank (1), a first slurry pump (2-1), a second slurry pump (2-2 ), a suspension tank (3), an absorber (6) and an air compressor (7); the suspension tank (3) having a first suspension inlet (3-1), a first suspension outlet (3-2) and a second suspension inlet (3-3); the absorber (6) having a mixed gas inlet (6-1), an exhaust gas outlet (6-2), suspension inlets (6-3) and a suspension outlet (6-4); wherein a slurry outlet of the slurry preparation tank (1) communicates with the first slurry inlet (3-1) of the slurry tank (3) via the first slurry pump (2-1); wherein the first suspension outlet (3-2) of the suspension tank (3) communicates with the suspension inlets (6-3) of the absorber {6) via the second suspension pump (2-2); wherein the second suspension inlet (3-3) of the suspension tank (3) communicates with the suspension outlet (6-4) of the absorber (6); and wherein the air compressor (7) is in communication with the mixed gas inlet (6-1) of the absorber (6). 10. Systeem volgens conclusie 2, waarbij het systeem verder een warmtewisselaar (4) en een stofafscheider (5) omvat; waarbij een rookgasuitlaat van de warmtewisselaar (4) in verbind- ing staat met een rookgasinlaat van de stofafscheider (5); en waarbij een rookgasafvoer van de stofafscheider (5) in verbinding staat met de gemengd gasinlaat (6-1) van de absorber (6).A system according to claim 2, wherein the system further comprises a heat exchanger (4) and a dust collector (5); wherein a flue gas outlet of the heat exchanger (4) is in communication with a flue gas inlet of the dust collector (5); and wherein a flue gas outlet of the dust collector (5) is in communication with the mixed gas inlet (6-1) of the absorber (6).
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