CN107812441A - Flue gas dry desulfurizing method of denitration based on red mud - Google Patents
Flue gas dry desulfurizing method of denitration based on red mud Download PDFInfo
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Abstract
Supplied the invention discloses a kind of flue gas dry desulfurizing method of denitration based on red mud, including by flue gas, flue gas desulfurization and denitrification agent powder and the strong oxidizer aqueous solution to desulphurization denitration tower, carry out dry desulfurization denitration process, flue gas after being handled；Wherein, the flue gas desulfurization and denitrification agent is made up of 60~80wt% red mud powder and 20~40wt% nanosize metal oxide；The nanosize metal oxide includes following component：The parts by weight of MgO 16~32, MnO20.005~0.03 parts by weight, the parts by weight of CuO 1.0~3.5, the parts by weight of CaO 0.3~0.8 and Fe2O30.03~0.12 parts by weight；One or more of the strong oxidizer in sodium chlorite, sodium hypochlorite, potassium permanganate, potassium ferrate, hydrogen peroxide；And the dosage of the strong oxidizer is 2~10wt% of the flue gas desulfurization and denitrification agent dosage.The method denitrification efficiency of the present invention is high, and cost is low.
Description
Technical field
The present invention relates to a kind of flue gas dry desulfurizing method of denitration based on red mud.
Background technology
Scientist and commercial undertaking are directed to the research of desulphurization denitration technology always.Studied, developed and made at present
The desulfurization technology kind more than 200, wherein relatively mature and feasible, economical and practical technical scheme there are about more than 20 and plant,
With wet flue gas such as limestone-gypsum wet flue gas desulfurization technology, desulfuration of flue gas by sea water technology, dual alkali scrubbing FGD process technologies
Based on desulfurization technology.Existing denitration technology is broadly divided into burning pre-treatment, Combustion Process Control and burning post processing.With burning
SCR (SCR), the SNCR (SNCR) of post processing are most widely used.
At present various countries' desulphurization denitration use substantially associated form carry out, i.e., desulphurization and denitration is separately handled, or wet type desulfurizing with
Dry denitration is combined, or desulfuration in furnace is combined with the outer denitration of stove, though this kind of combination treatment method can reach in effect
To environmental protection standard, but facility investment is high, and floor space is big, operating cost height and complex operation.
Relative to desulphurization denitration technical tie-up processing is used alone, synchronized desulfuring and denitrifying is in economy and the level of resources utilization
Aspect has a greater advantage, and as people increasingly increase demands such as the cost of gas cleaning, perceptions, cost is relatively low, perception
Relatively good dry method flue gas synchronized desulfuring and denitrifying technology has obtained larger development and application, it has also become smoke gas treatment field
Study hotspot.Patent document CN104998539A discloses a kind of dry type flue gas desulfurizing denitration dust collecting integral purification technique, leads to
SNCR denitration system and duct injection dry powder absorbent are crossed to realize dry type desulphurization denitration, the technique not water consumption, reduces and sets
The risk of standby corrosion, but still NH in inevitable SNCR systems3Consumption and NH3The problem of leakage, it is further improved.
The contaminative waste residue that red mud is discharged when being aluminium industry extraction aluminum oxide.China is used as alumina producing big country, often
The red mud that year discharges is up to millions of tons.Substantial amounts of red mud sufficiently effective can not utilize, and can only rely on the stockyard heap of large area
Put, also cause serious pollution while taking a large amount of soils to environment.Red mud is in strong basicity in itself, and contains substantial amounts of oxygen
Changing component, these components such as iron, aluminum oxide, silica has certain facilitation, wherein ferriferous oxide for desulphurization denitration
With good catalytic activity, aluminum oxide, silica are the carriers for the denitrating catalyst being widely studied, therefore using red mud as base
Plinth raw material, which prepares desulfurization denitrification agent, has certain feasibility and application value.Patent document CN103521164A discloses one kind
The flue gas demercuration desulphurization denitration adsorbent prepared using red mud as primary raw material, red mud is in Mn (NO after activation3)2And NH4VO3Mixing
Hot submersion in solution, then obtained after drying, roasting, broken, screening with MnO2And V2O5Combined modified red mud.The material
Though the purpose of demercuration desulphurization denitration can be realized, early stage, processing was complex, and operating cost is high, is unsuitable for industrialization and uses.
The content of the invention
It is an object of the invention to provide a kind of flue gas dry desulfurizing method of denitration based on red mud, this method synchronously solves
The processing of red mud and smoke pollution problem, waste recycling, turn waste into wealth, and denitrification efficiency is high, and cost is low, and subsequent products
Recycling, high financial profit, suitable for industrialized production can be carried out.
The purpose of the present invention is achieved by the following technical solution.
The flue gas dry desulfurizing method of denitration based on red mud of the present invention comprises the following steps：
Flue gas, flue gas desulfurization and denitrification agent powder and the strong oxidizer aqueous solution are supplied to desulphurization denitration tower, dry method is carried out and takes off
Sulphur denitration process, flue gas after being handled；Wherein, the red mud powder of the flue gas desulfurization and denitrification agent powder including 60~80wt% and
20~40wt% nanosize metal oxide；The nanosize metal oxide includes following component：The weight of MgO 16~32
Part, MnO20.005~0.03 parts by weight, the parts by weight of CuO 1.0~3.5, the parts by weight of CaO 0.3~0.8 and Fe2O30.03~
0.12 parts by weight；In the strong oxidizer aqueous solution, strong oxidizer is selected from sodium chlorite, sodium hypochlorite, potassium permanganate, high ferro
One or more in sour potassium, hydrogen peroxide；And the dosage of the strong oxidizer for the flue gas desulfurization and denitrification agent dosage 2~
10wt%.
Method in accordance with the invention it is preferred that the strong oxidizer is sodium chlorite and/or sodium hypochlorite.
Method in accordance with the invention it is preferred that the strong oxidizer is sodium chlorite；Or the strong oxidizer is weight
Than for 1~2:1~2 sodium chlorite and sodium hypochlorite.
Method in accordance with the invention it is preferred that the dosage of the strong oxidizer is the 3 of the flue gas desulfurization and denitrification agent dosage
~6wt%.
Method in accordance with the invention it is preferred that the dry desulfurization denitration process is higher than 10~20 DEG C of flue gas dew point
At a temperature of carry out.
Method in accordance with the invention it is preferred that the nanosize metal oxide includes following component：The weights of MgO 20~30
Measure part, MnO20.01~0.028 parts by weight, the parts by weight of CuO 1.5~2.5, the parts by weight of CaO 0.4~0.6 and Fe2O3 0.05
~0.10 parts by weight.
Method in accordance with the invention it is preferred that the nanosize metal oxide also comprises the following components：V2O5 0.005
~0.03 parts by weight.
Method in accordance with the invention it is preferred that being counted using the quality of red mud powder as 100wt%, the red mud powder includes oxidation
6~50wt% of calcium, 2~10wt% of sodium oxide molybdena, 5~20wt% of aluminum oxide, 5~50wt% of iron oxide and silica 3~
25wt%；The basicity for preparing the wastewater from red mud of the red mud powder is 3000~15000mg/L.
Method in accordance with the invention it is preferred that the particle diameter of the red mud powder is more than 200 mesh；The nano level metal oxygen
The particle diameter of compound is 10~60nm.
Method in accordance with the invention it is preferred that the desulphurization denitration tower is recirculating fluidized bed absorption tower, the flue gas is led to
Cross Venturi nozzle and enter the recirculating fluidized bed absorption tower, the strong oxidizer aqueous solution is sprayed into by atomizer described in
Recirculating fluidized bed absorption tower.
In the present invention, under above-mentioned flue gas desulfurization and denitrification agent and the mating reaction of both the strong oxidizer aqueous solution, synthesis desulfurating
Efficiency is up to more than 95%, and denitration efficiency is up to more than 85%.According to the preferred embodiment of the present invention, desulfuration efficiency up to 98% with
On, denitration efficiency is up to more than 90%.The desulfurization denitration method of the present invention, water consumption is reduced in running, and without catalyst
Bed, resistance is reduced, while reduce operating cost；Caused waste residue can be used for the life of the byproducts such as building materials after desulphurization denitration
Production, realizes recycling.
Embodiment
With reference to specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to
This.
The dry flue gas desulphurization method of denitration of the present invention represents not using desulphurization denitration slurries but using desulphurization denitration powder
The method that end carries out flue gas desulfurization and denitrification.That is, desulphurization denitration powder directly contacts with flue gas, without being prepared into
Slurries, then with smoke contacts.The method of the present invention includes flue gas desulfurization and denitrification step；Dust removal step, circulation step can also be included
It is rapid etc..
Flue gas, flue gas desulfurization and denitrification agent powder and the strong oxidizer aqueous solution are supplied to desulphurization denitration tower, dry method is carried out and takes off
Sulphur denitration process, flue gas after being handled.The flue gas is preferably the flue gas after pre- dust removal process.Can by pre- dust removal process
Most dust granules in flue gas are removed, reduce the load of subsequent handling, reduce influence of the flying dust to desulfurization and denitrification reaction.This
In invention, the efficiency of dust collection of pre- dust removal process is more than 80%, preferably more than 90%.In the present invention, it is preferred to use electrostatic removes
Dirt device carries out pre- dust removal process.
SO in flue gas2Content can be less than or equal to 3000mg/Nm3, preferably 1000~2000mg/Nm3；Nitrogen oxides
NOXContent can be less than or equal to 600mg/Nm3, preferably 300~500mg/Nm3.It so may further ensure that flue gas desulfurization takes off
Nitre agent plays preferably effect.
In the present invention, flue gas desulfurization and denitrification agent powder includes 60~80wt% red mud powder and 20~40wt% nanoscale
Metal oxide；Such as red mud powder and 30~40wt% nanosize metal oxide including 60~70wt%.Preferably, cigarette
Desulfurization denitrfying agent powder is made up of 60~80wt% red mud powder and 20~40wt% nanosize metal oxide；For example,
Flue gas desulfurization and denitrification agent is made up of 60~70wt% red mud powder and 30~40wt% nanosize metal oxide.
The alkaline scrap material that the red mud powder of the present invention is discharged in being produced for aluminium industry, and to dry powder.Preferably, with red
The quality of mud powder is 100wt% meters, and red mud powder includes 6~50wt% of calcium oxide, 2~10wt% of sodium oxide molybdena, aluminum oxide 5~
3~25wt% of 20wt%, 5~50wt% of iron oxide and silica.In the present invention, it is preferable that for preparing the red mud powder
The basicity of wastewater from red mud be 3000~15000mg/L, preferably 5000~10000mg/L.Such basicity is advantageous to absorb
SO in flue gas2, and can further improve the synergy of red mud powder and other components, so as to improve desulfurization off sulfide effect.
The nanosize metal oxide of the present invention includes following component：The parts by weight of MgO 16~32, MnO20.005~
0.03 parts by weight, the parts by weight of CuO 1.0~3.5, the parts by weight of CaO 0.3~0.8 and Fe2O30.03~0.12 parts by weight.According to
An embodiment of the invention, the nanosize metal oxide are made up of following component：The parts by weight of MgO 16~32, MnO2
0.005~0.03 parts by weight, the parts by weight of CuO 1.0~3.5, the parts by weight of CaO 0.3~0.8 and Fe2O30.03~0.12 weight
Part.
According to an embodiment of the invention, the nanosize metal oxide includes following component：MgO 20~30
Parts by weight, MnO20.01~0.028 parts by weight, the parts by weight of CuO 1.5~2.5, the parts by weight of CaO 0.4~0.6 and Fe2O3
0.05~0.10 parts by weight.Preferably, the nanosize metal oxide is made up of following component：The parts by weight of MgO 20~30,
MnO20.01~0.028 parts by weight, the parts by weight of CuO 1.5~2.5, the parts by weight of CaO 0.4~0.6 and Fe2O30.05~0.10
Parts by weight.
According to one preferred embodiment of the invention, the nanosize metal oxide also includes V2O5.In some implementations
In mode, the nanosize metal oxide includes following component：The parts by weight of MgO 16~32, MnO20.005~0.03 weight
Part, the parts by weight of CuO 1.0~3.5, the parts by weight of CaO 0.3~0.8, Fe2O30.03~0.12 parts by weight and V2O50.005~
0.03 parts by weight.In some embodiments, the nanosize metal oxide includes following component：The weight of MgO 20~30
Part, MnO20.01~0.028 parts by weight, the parts by weight of CuO 1.5~2.5, the parts by weight of CaO 0.4~0.6, Fe2O30.05~
0.10 parts by weight and V2O50.008~0.025 parts by weight.It is highly preferred that the nanosize metal oxide includes following component：
The parts by weight of MgO 29.5, MnO20.025 parts by weight, the parts by weight of CuO 1.875, the parts by weight of CaO 0.5, Fe2O3Form 0.085 weight
Measure part and V2O50.015 parts by weight.Said components are controlled in above range, can further improve desulfurization off sulfide effect.
In the present invention, nanosize metal oxide only can be made up of said components.
In the flue gas desulfurization and denitrification agent of the present invention, the particle diameter of the red mud powder can be more than or equal to 200 mesh, preferably greater than etc.
In 250 mesh.The particle diameter of the nanosize metal oxide can be 10~60nm, preferably 10~50nm, more preferably 15~
40nm, it is further preferably 20~30nm.In the present invention, when metal oxide uses above-mentioned particle diameter, the increase of its specific surface area, add
Metal oxide and oxygen, the contact area of flue gas, for SO in flue gas2And NOXAdsorption function increase, so as to improve desulfurization
The efficiency of denitration.When metal oxide uses currently preferred particle diameter, SO in its specific surface area flue gas preferably2And NOX's
Absorption, can further improve denitrification efficiency.
The preparation method of the flue gas desulfurization and denitrification agent powder of the present invention can include preparation process, the nanometer grade gold of red mud powder
Belong to oxide preparation process and/or flue gas desulfurization and denitrification agent powder preparation step.The preparation process of red mud powder is：By red mud in
Heating, drying at a temperature of 150~200 DEG C, preferably 160~180 DEG C；Crush and be more than 200 mesh, preferably greater than 250 purposes for particle diameter
Powder, obtain red mud powder.Nanosize metal oxide preparation process is：By the metal oxide be prepared into particle diameter for 10~
60nm, preferably 10~50nm, more preferably 15~40nm, it is further preferably 20~30nm nano-scale particles, obtains nanometer grade gold
Belong to oxide.The preparation process of flue gas desulfurization and denitrification agent powder is：The red mud powder and the nanosize metal oxide are mixed
Close uniformly, obtain flue gas desulfurization and denitrification agent powder.
The red mud of the preparation red mud powder of the present invention has higher basicity, can absorb the acid SO in flue gas2；It is and red
Containing abundant iron oxide in mud, for NO and O2Reaction there is good catalytic activity；MnO2And Fe2O3NO is respectively provided with
More preferably catalytic oxidation effect, it is NO by NO catalysis oxidations2, then absorbed, reach by the alkaline matter in flue gas desulfurization and denitrification agent
To denitration effect.When containing V in nanosize metal oxide2O5When, can be more effectively by SO2Catalysis oxidation is to SO3, SO3With
Alkali substance reaction generates sulfate to reach desulfurized effect.In the present invention, the addition of nanosize metal oxide, ratio is increased
Surface area, metal oxide and oxygen, the contact area of flue gas are added, is improved for SO in flue gas2And NOXAbsorption work(
Can, so as to improve the efficiency of desulphurization denitration.
In the strong oxidizer aqueous solution of the present invention, strong oxidizer can be selected from sodium chlorite, sodium hypochlorite, permanganic acid
One or more in potassium, potassium ferrate and hydrogen peroxide, preferably sodium chlorite and/or sodium hypochlorite.According to the present invention's
One embodiment, the strong oxidizer are sodium chlorite.According to another implementation of the invention, the strong oxidizer is
The mixture of sodium chlorite and sodium hypochlorite, and the two weight ratio is 1~2:1~2, more preferably 1:1.In the present invention, strong oxygen
The dosage of agent is the 2~10wt%, more preferably preferably 2~8wt%, 3~6wt% of flue gas desulfurization and denitrification agent dosage, then
Preferably 3~5wt%.Using such usage ratio, it can more effectively make sulfur dioxide in flue gas and nitrogen oxides
And absorption, so as to realize higher denitrification efficiency.
The strong oxidizer of the present invention is soluble in water to be made the strong oxidizer aqueous solution, is then supplied in desulphurization denitration tower.By force
Aqueous oxidizing agent solution is evacuated to atomizer by high-pressure hydraulic pump, then sprays to desulphurization denitration tower, and can so be humidified particle
Surface, it is easy to desulfurization and denitrification reaction；Cigarette temperature can also effectively be reduced.According to an embodiment of the invention, the desulfurization takes off
Nitre tower is recirculating fluidized bed absorption tower, flue gas is entered into the recirculating fluidized bed absorption tower by Venturi nozzle, by Strong oxdiative
The agent aqueous solution sprays into the recirculating fluidized bed absorption tower by atomizer.
In the present invention, the dosage for preparing the water of the strong oxidizer aqueous solution is to be down to the flue-gas temperature in desulphurization denitration tower
Higher than 10~20 DEG C of the dew point of flue gas, preferably 12~16 DEG C, more preferably 15 DEG C, so as to avoid acid mist condensation, etching apparatus
While, temperature is reduced, promotes reaction to carry out.According to the specific embodiment of the present invention, the strong oxidizer aqueous solution is prepared
The dosage of water be the flue-gas temperature in desulphurization denitration tower is down to 70~85 DEG C, preferably 75~80 DEG C.According to the present invention's
One embodiment, the dry desulfurization denitration process is higher than 10~20 DEG C of flue gas dew point, preferably 12~16 DEG C, more preferably
To carry out at a temperature of 15 DEG C.According to another implementation of the invention, the dry desulfurization denitration process is at 70~85 DEG C,
Carried out at a temperature of preferably 75~80 DEG C.It can so ensure that strong oxidizer, flue gas desulfurization and denitrification agent powder preferably play
Effect, improve denitrification efficiency.
The dust removal step of the present invention is that flue gas carries out dust removal process after desulphurization denitration is handled, and obtains cleaning flue gases and solid
Particle.Cleaning flue gases can be directly by smoke stack emission into air.Dust removal step can use deduster conventional in field to enter
OK, sack cleaner and is preferably used.In dust removal process, the solid particle can be separated into the complete desulfurization of unreacted and taken off
Nitre agent and byproduct of reaction.The circulation step of the present invention is that the complete desulfurization denitrification agent of unreacted is recycled into desulphurization denitration tower
It is interior, reused.Byproduct of reaction is used directly for the production of other products (such as building material product), realizes recycling
Utilize.
In following examples, red mud powder be by by red mud at 180 DEG C heating, drying, be then crushed to particle diameter as 200
What~250 mesh obtained.The basicity for wherein preparing wastewater from red mud used by red mud powder is 8000mg/L.Nanosize metal oxide
Corresponding metal oxide is ground into particle diameter by using ball mill to obtain for 25nm.
In following examples, inlet flue gas is the flue gas that have passed through pre- dust removal process.The basic parameter of inlet flue gas such as table 1
It is shown.
Table 1, inlet flue gas basic parameter table
Embodiment 1
Flue gas desulfurization and denitrification agent powder is prepared using the formula of table 2.Flue gas desulfurization and denitrification agent powder is supplied to desulfurization
Denitrating tower.
Table 2, flue gas desulfurization and denitrification agent power formulations
| Component | Parts by weight |
| Red mud powder | 78 |
| MgO (nanoscale) | 20 |
| MnO2(nanoscale) | 0.011 |
| CuO (nanoscale) | 1.539 |
| CaO (nanoscale) | 0.4 |
| Fe2O3(nanoscale) | 0.05 |
Using sodium chlorite as strong oxidizer, and the dosage of sodium chlorite is flue gas desulfurization and denitrification agent powder dosage
3wt%.Sodium chlorite is dissolved in water the strong oxidizer aqueous solution is made, sprayed using atomizer to recirculating fluidized bed absorption tower
It is interior.The dosage of water is that flue-gas temperature can be made to be down to 75 DEG C.
Flue gas is entered into the recirculating fluidized bed absorption tower by Venturi nozzle.In recirculating fluidized bed absorption tower, cigarette
Gas, flue gas desulfurization and denitrification agent powder and the mixing of the strong oxidizer aqueous solution, so as to carry out dry desulfurization denitration process, after obtaining processing
Flue gas.Flue gas enters sack cleaner progress dust removal process after processing, obtains cleaning flue gases and solid particle, cleaning flue gases are through cigarette
Chimney is emitted into air, and solid particle is separated into the complete desulfurization denitrification agent of unreacted and byproduct of reaction, unreacted are complete
Desulfurization denitrification agent is recycled in desulphurization denitration tower, is reused.Fume emission situation is referring to table 3.
Table 3, fume emission situation
| Sequence number | Parameter | Unit | Numerical value |
| 1 | Exiting flue gas amount (operating mode) | m3/h | 146764 |
| 2 | Exiting flue gas amount (mark condition) | Nm3/h | 124045 |
| 3 | Exhaust gas temperature | ℃ | 50 |
| 4 | SO2Concentration of emission | mg/Nm3 | 50.4 |
| 5 | NOXConcentration of emission | mg/Nm3 | 58.5 |
| 6 | Desulfuration efficiency | % | 96 |
| 7 | Denitration efficiency | % | 87 |
Embodiment 2
Flue gas desulfurization and denitrification agent power formulations are referring to table 4；Strong oxidizer uses weight ratio as 1:1 sodium chlorite and time chlorine
The mixture of sour sodium, and the dosage of strong oxidizer is the 3wt% of flue gas desulfurization and denitrification agent powder dosage, other conditions and embodiment
1 is identical.Fume emission situation is referring to table 5.
Table 4, flue gas desulfurization and denitrification agent power formulations
| Component | Parts by weight |
| Red mud powder | 68 |
| MgO (nanoscale) | 28.3 |
| MnO2(nanoscale) | 0.02 |
| CuO (nanoscale) | 2.9 |
| CaO (nanoscale) | 0.69 |
| Fe2O3(nanoscale) | 0.08 |
| V2O5(nanoscale) | 0.01 |
Table 5, fume emission situation
| Sequence number | Parameter | Unit | Numerical value |
| 1 | Exiting flue gas amount (operating mode) | m3/h | 144320 |
| 2 | Exiting flue gas amount (mark condition) | Nm3/h | 121979 |
| 3 | Exhaust gas temperature | ℃ | 50 |
| 4 | SO2Concentration of emission | mg/Nm3 | 48 |
| 5 | NOXConcentration of emission | mg/Nm3 | 45 |
| 6 | Desulfuration efficiency | % | 97.8 |
| 7 | Denitration efficiency | % | 90 |
Embodiment 3
Flue gas desulfurization and denitrification agent power formulations are referring to table 6；Strong oxidizer uses weight ratio as 1:1 sodium chlorite and time chlorine
The mixture of sour sodium, and the dosage of strong oxidizer is the 4wt% of flue gas desulfurization and denitrification agent powder dosage, other conditions and embodiment
1 is identical.Fume emission situation is referring to table 7.
Table 6, flue gas desulfurization and denitrification agent power formulations
| Component | Parts by weight |
| Red mud powder | 68 |
| MgO (nanoscale) | 29.5 |
| MnO2(nanoscale) | 0.025 |
| CuO (nanoscale) | 1.875 |
| CaO (nanoscale) | 0.5 |
| V2O5(nanoscale) | 0.015 |
| Fe2O3(nanoscale) | 0.085 |
Table 7, fume emission situation
| Sequence number | Parameter | Unit | Numerical value |
| 1 | Exiting flue gas amount (operating mode) | m3/h | 143250 |
| 2 | Exiting flue gas amount (mark condition) | Nm3/h | 121075 |
| 3 | Exhaust gas temperature | ℃ | 50 |
| 4 | SO2Concentration of emission | mg/Nm3 | 9 |
| 5 | NOXConcentration of emission | mg/Nm3 | 36 |
| 6 | Desulfuration efficiency | % | 99.5 |
| 7 | Denitration efficiency | % | 92 |
The present invention is not limited to above-mentioned embodiment, in the case of without departing substantially from the substantive content of the present invention, this area skill
Any deformation, improvement, the replacement that art personnel are contemplated that each fall within the scope of the present invention.
Claims (10)
1. a kind of flue gas dry desulfurizing method of denitration based on red mud, it is characterised in that comprise the following steps：
Flue gas, flue gas desulfurization and denitrification agent powder and the strong oxidizer aqueous solution are supplied to desulphurization denitration tower, dry desulfurization is carried out and takes off
Nitre processing, flue gas after being handled；Wherein, the red mud powder of the flue gas desulfurization and denitrification agent powder including 60~80wt% and 20~
40wt% nanosize metal oxide；The nanosize metal oxide includes following component：The parts by weight of MgO 16~32,
MnO20.005~0.03 parts by weight, the parts by weight of CuO 1.0~3.5, the parts by weight of CaO 0.3~0.8 and Fe2O30.03~0.12
Parts by weight；In the strong oxidizer aqueous solution, strong oxidizer is selected from sodium chlorite, sodium hypochlorite, potassium permanganate, ferric acid
One or more in potassium, hydrogen peroxide；And the dosage of the strong oxidizer for the flue gas desulfurization and denitrification agent powder 2~
10wt%.
2. according to the method for claim 1, it is characterised in that the strong oxidizer is sodium chlorite and/or sodium hypochlorite.
3. according to the method for claim 2, it is characterised in that the strong oxidizer is sodium chlorite；Or the strong oxygen
Agent is that weight ratio is 1~2:1~2 sodium chlorite and sodium hypochlorite.
4. according to the method for claim 1, it is characterised in that the dosage of the strong oxidizer is the flue gas desulfurization and denitrification
3~6wt% of agent.
5. according to the method for claim 1, it is characterised in that the dry desulfurization denitration process is higher than flue gas dew point 10
Carried out at a temperature of~20 DEG C.
6. according to the method for claim 1, it is characterised in that the nanosize metal oxide includes following component：MgO
20~30 parts by weight, MnO20.01~0.028 parts by weight, the parts by weight of CuO 1.5~2.5, the parts by weight of CaO 0.4~0.6 and
Fe2O30.05~0.10 parts by weight.
7. according to the method for claim 1, it is characterised in that the nanosize metal oxide also comprises the following components：
V2O50.005~0.03 parts by weight.
8. according to the method described in any one of claim 1~7, it is characterised in that counted using the quality of red mud powder as 100wt%,
The red mud powder includes 6~50wt% of calcium oxide, 2~10wt% of sodium oxide molybdena, 5~20wt% of aluminum oxide, 5~50wt% of iron oxide
With 3~25wt% of silica；The basicity for preparing the wastewater from red mud of the red mud powder is 3000~15000mg/L.
9. according to the method for claim 1, it is characterised in that the particle diameter of the red mud powder is more than 200 mesh；The nanometer
The particle diameter of level metal oxide is 10~60nm.
10. according to the method for claim 1, it is characterised in that the desulphurization denitration tower is recirculating fluidized bed absorption tower, will
The flue gas enters the recirculating fluidized bed absorption tower by Venturi nozzle, and the strong oxidizer aqueous solution is sprayed by being atomized
Mouth sprays into the recirculating fluidized bed absorption tower.
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| US11440842B2 (en) * | 2020-04-23 | 2022-09-13 | Kunming University Of Science And Technology | Method for preparing a cementing material using smelting industrial waste slag after utilizing the simultaneous removal of S02 and NOx in flue gas and application of the cementing material obtained by the same |
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