CN107500710A - The production method of gypsum - Google Patents
The production method of gypsum Download PDFInfo
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- CN107500710A CN107500710A CN201710938288.0A CN201710938288A CN107500710A CN 107500710 A CN107500710 A CN 107500710A CN 201710938288 A CN201710938288 A CN 201710938288A CN 107500710 A CN107500710 A CN 107500710A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/30—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing magnesium cements or similar cements
-
- 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
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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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
- B01D53/73—After-treatment of removed components
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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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/82—Solid phase processes with stationary reactants
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- 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
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- 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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biomedical Technology (AREA)
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Abstract
The invention discloses a kind of production method of gypsum, including：(1) flue gas is contacted with the desulphurization denitration inorganic agent being placed in fixed bed reactors, dry desulfurization denitration is carried out, so as to form the accessory substance containing calcium sulfate and calcium nitrate；The desulphurization denitration inorganic agent includes 10~25 parts by weight nano inorganic oxides, 10~25 parts by weight micron inorganic oxides, 10~25 parts by weight magnesia and 20~35 parts by weight calcium oxide；Wherein, described nano inorganic oxide is selected from SiO2、Fe2O3、Al2O3, CuO and MnO2In one or more, described micron inorganic oxide is selected from SiO2、Fe2O3、Al2O3, CuO and MnO2In one or more；(2) material comprising the accessory substance, diatomite, talcum powder and binding agent is well mixed and obtains siccative, and the water is mixed with siccative, then pouring molding obtains the gypsum.The method of the present invention can realize that flue gas desulfurization, solid waste integration are administered, and can also obtain qualified gypsum.
Description
Technical field
It is especially a kind of to be taken off using fixed bed reactors progress dry method flue gas the present invention relates to a kind of production method of gypsum
The production method of the gypsum of sulphur production.
Background technology
Building materials of gypsum refer to gypsum plaster ceiling board, gypsum putty, extraordinary mortar, brushing gypsum, gypsum wallboard, mould gypsum,
Gypsum block etc. is using plaster of Paris as construction material made of raw material.Building materials of gypsum has the spy such as safety, comfortable, quick, environmental protection
Point, its development space is big, prospect is good.
Not only performance is good for building materials of gypsum, and green building material.External building materials of gypsum is used than wide.What Europe was built
It is a kind of to be suitable for less than 8 layers, modular light construction system, belong to modular and build a house, first taken with steel framework in building site
Building structure is built out, is linked with rivet, the sheet material manufactured in factory is then transported into building site assembling, the floor of three canopys Building 1 four
Room.Interior wall is heat-insulated, the warming plate for having a variety of colors, and exterior wall has rain-proof water-proof sheet material.In European concrete structure very
Few, after having thermal insulation technology, individual layer wall is just substituted by double wall, wherein 96% being adopted using accounting for for interior Thermo Isolation Technique
1% is accounted for outer Thermo Isolation Technique, 3% is accounted for using from Thermo Isolation Technique, this provides extensive machine for a large amount of use of plasterboard
Meeting.
According to the sulfur content of China's electricity coal, byproduct-desulphurization denitration gypsum of nearly hundred million tons of desulfurization is discharged every year.Wet method takes off
Dihydrate gypsum in sulphur gypsum can be changed into semi-hydrated gypsum after calcining, so as to have gelling.The bulk deposition of gypsum
Secondary pollution is caused to environment.The step for dry desulfurization denitration gypsum can then be reduced, reduce energy consumption, while dry desulfurization
Denitration denitration can also avoid the influence to haze.
The content of the invention
It is an object of the present invention to provide a kind of production method of gypsum, and flue gas desulfurization, solid waste one can be realized
Bodyization is administered, and can also obtain qualified gypsum.
The present invention provides a kind of production method of gypsum, comprises the following steps：
(1) flue gas is contacted with the desulphurization denitration inorganic agent being placed in fixed bed reactors, carries out dry desulfurization denitration,
So as to form the accessory substance containing calcium sulfate and calcium nitrate；The desulphurization denitration inorganic agent includes 10~25 parts by weight nano inorganics
Oxide, 10~25 parts by weight micron inorganic oxides, 10~25 parts by weight magnesia and 20~35 parts by weight calcium oxide；Its
In, described nano inorganic oxide is selected from SiO2、Fe2O3、Al2O3, CuO and MnO2In one or more, described micron
Inorganic oxide is selected from SiO2、Fe2O3、Al2O3, CuO and MnO2In one or more；
(2) material comprising the accessory substance, diatomite, talcum powder and binding agent is well mixed and obtains siccative, and will
Water mixes with the siccative, and then pouring molding obtains the gypsum.
In accordance with the present production process, it is preferable that the desulphurization denitration inorganic agent is graininess, and it is selected from sheet
Grain, spherical particle or cylindrical particle；The thickness of the sheet-like particle is 5~10mm, and a diameter of 10~25mm；The column
A diameter of 1~3mm of grain, and length is 3~8mm；A diameter of 2~5mm of the spherical particle.
In accordance with the present production process, it is preferable that the fixed bed reactors include multiple reaction tubes, and the desulfurization takes off
Nitre inorganic agent is filled in the reaction tube, and the packed height is the 80~95% of tube length of reaction tube, and the caliber of reaction tube is
15~150mm, and the particle diameter of desulphurization denitration inorganic agent is less than 6 times of the caliber of reaction tube.
In accordance with the present production process, it is preferable that the oxygen content of the flue gas is 10~25vol%.
In accordance with the present production process, it is preferable that in step (1), the content of sulfur dioxide of the flue gas for 300~
40000mg/Nm3, amount of nitrogen oxides be 100~600mg/Nm3, flue gas flow rate is 2~5m/s and temperature is 110~200 DEG C.
In accordance with the present production process, it is preferable that in step (1), described nano inorganic oxide includes SiO2、
Al2O3And MnO2；Described micron inorganic oxide includes SiO2、Al2O3And MnO2。
In accordance with the present production process, it is preferable that in described nano inorganic oxide, SiO2、Al2O3And MnO2
Weight ratio be 3~8:5~10:5~10；In described micron inorganic oxide, SiO2、Al2O3And MnO2Weight ratio be
3~8:5~10:5~10.
In accordance with the present production process, it is preferable that in step (2), the material include 40~80 parts by weight,
25~35 parts by weight diatomite, 5~10 parts by weight talcum powder and 1~10 parts by weight binder.
In accordance with the present production process, it is preferable that described material also includes 5~10 parts by weight additives；It is described to add
Agent is added to be selected from least one of lignin water reducer, naphthalene sulfonic acids water reducer, benzene sulfonic acid water reducer or polycarboxylate water-reducer；It is described
The one kind or kind of binding agent in cement, magnesium sulfate or magnesia.
In accordance with the present production process, it is preferable that the weight of water and siccative ratio is 0.2~0.5, and described water is that pH is big
In 5 industrial wastewater.
The present invention is combined flue gas dry desulfurizing denitrating technique with gypsum production technology so that the two is synchronously carried out.This hair
The bright calcination link eliminated in desulfurated plaster production process, thus it is more environmentally-friendly.Using the present invention desulphurization denitration inorganic agent,
Denitrification efficiency is high, and does not produce additional pollutant.The water consumption of the method for the present invention is wet desulphurization denitrating technique
20%.The method of the present invention can use the waste water that industrial inter-process is crossed, and reduce the discharge of waste water, solve wastewater treatment
Problem, saves the processing cost of waste water, and realizes waste water circulation 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 production method of the gypsum of the present invention includes (1) flue gas desulfurization and denitrification step；(2) plaster formulation step.Enter below
Row is discussed in detail.
<Flue gas desulfurization and denitrification step>
Dry desulfurization denitration is carried out to flue gas using desulphurization denitration inorganic agent, so as to form accessory substance.Contain two in flue gas
Sulfur oxide and nitrogen oxides, desulphurization denitration inorganic agent is by these material absorbings, so as to reach the purpose of desulphurization denitration.Thus, it is secondary
Contain calcium sulfate and calcium nitrate in product.
Flue gas desulfurization and denitrification is carried out in fixed bed reactors.Desulphurization denitration inorganic agent is placed on fixed bed reactors
In.The desulphurization denitration inorganic agent is graininess, cellular or tabular.Fixed bed reactors can be known in the art that
A bit.Preferably, the fixed bed reactors of the present invention are calandria type fixed bed, so can be by desulphurization denitration inorganic agent with removing in advance
Cloud of dust gas fully contacts, and improves desulfurization off sulfide effect.Calandria type fixed bed heat transferring medium can be selected from conduction oil, fused salt or cigarette
Road gas, to ensure that heating-up temperature reaches 150~500 DEG C.The heat transferring medium is more preferably fused salt.In certain embodiments,
Fixed bed reactors include multiple reaction tubes, and the desulphurization denitration inorganic agent is filled in the reaction tube, and packed height is anti-
Answer the 80~95% of length of tube.The caliber of reaction tube is 15~150mm, preferably 30~100mm.When desulphurization denitration inorganic agent is
When graininess takes off, the particle diameter of sulphur denitration process agent can be less than 6 times of the caliber of reaction tube, the preferably less than caliber of reaction tube
8 times.Flue gas desulfurization and denitrification effect and fume treatment efficiency can so be taken into account.
According to an embodiment of the invention, desulphurization denitration inorganic agent is graininess.It can be sheet-like particle, spherical
At least one of particle or cylindrical particle.The thickness of the sheet-like particle is 5~10mm, a diameter of 10~25mm.Described
Shape particle can use rotary tablet machine or single-punch tablet press to prepare.The diameter range of the cylindrical particle is 1~3mm,
Length is 3~8mm；Preferably, the diameter range of the cylindrical particle is 1~2mm, and length is 2~5mm；It is it is highly preferred that described
A diameter of 1.5mm of cylindrical particle, length 3mm.The cylindrical particle can use single-screw extruder, double screw banded extruder
Or strip is made in hydraulic banded extruder, the cylindrical particle of certain length is then cut into.The spherical particle it is straight
Footpath scope is 2~5mm.The spherical particle can use single-screw extruder, double screw banded extruder or hydraulic to squeeze first
Bar mechanism prepares growth strip, is cut to that diameter is of substantially equal with length, and then shaped comminutor is processed into again.
According to another implementation of the invention, the desulphurization denitration inorganic agent is cellular, and pitch is 6.1~
7.4mm, preferably 6.5~7mm；Outer wall thickness is 1.15~1.7mm, preferably 1.3~1.5mm, and interior wall thickness is 0.72~1mm,
Preferably 0.8~0.9mm.Cellular desulphurization denitration inorganic agent can use single screw rod forming machine, twin-screw forming machine to carry out
Extrusion molding.
The desulphurization denitration inorganic agent of the present invention includes 10~25 parts by weight nano inorganic oxides, 10~25 parts by weight microns
Inorganic oxide, 10~25 parts by weight magnesia and 20~35 parts by weight calcium oxide.Nano inorganic oxide can be selected from SiO2、
Fe2O3、Al2O3, CuO and MnO2In one or more.Micron inorganic oxide can be selected from SiO2、Fe2O3、Al2O3, CuO and
MnO2In one or more.In certain embodiments, desulphurization denitration inorganic agent can include 15~23 parts by weight nanometer nothings
Machine oxide, 15~23 parts by weight micron inorganic oxides, 20~25 parts by weight magnesia and 22~35 parts by weight calcium oxide.More
Preferably, it is inorganic can to include 16~22 parts by weight nano inorganic oxides, 16~22 parts by weight microns for desulphurization denitration inorganic agent
Oxide, 20~23 parts by weight magnesia and 30~35 parts by weight calcium oxide.Each component of desulphurization denitration inorganic agent is controlled
In above range, its denitration effect can be effectively improved, so as to ensure the stability of the stability of accessory substance and gypsum production.
In the desulphurization denitration inorganic agent of the present invention, the particle diameter of nano inorganic oxide can be in 10~100nm；Preferably
20~90nm.The particle diameter of micron inorganic oxide can be at 1~500 μm；Preferably 10~100 μm.Using above-mentioned different-grain diameter
Inorganic oxide combined with calcium oxide, can effectively remove the sulfur dioxide in flue gas, and then be stably formed accessory substance, have
Beneficial to the steady production of gypsum.
In the desulphurization denitration inorganic agent of the present invention, described nano inorganic oxide can be selected from SiO2、Fe2O3、
Al2O3, CuO and MnO2In one or more；Preferably include SiO2、Al2O3And MnO2。SiO2、Al2O3And MnO2Weight ratio be
3~8:5~10:5~10, such as 5~8:8~10:8~10.Described micron inorganic oxide can be selected from SiO2、Fe2O3、
Al2O3, CuO and MnO2In one or more；Preferably include SiO2、Al2O3And MnO2。SiO2、Al2O3And MnO2Weight ratio be
3~8:5~10:5~10, such as 5~8:8~10:8~10.
According to the specific embodiment of the present invention, desulphurization denitration inorganic agent includes 35 parts by weight calcium oxide, 23 weight
Part magnesia, 21 parts by weight nano inorganic oxides and 21 parts by weight nano inorganic oxides；Aoxidized in described nano inorganic
In thing, SiO2、Al2O3And MnO2Weight ratio be 5:8:8；In described micron inorganic oxide, SiO2、Al2O3And MnO2's
Weight ratio is 5:8:8.
In the desulphurization denitration inorganic agent of the present invention, metal oxide can react to form Asia with the sulfur dioxide in flue gas
Sulfate；When sulfur dioxide and water generation sulfurous acid, sulfurous acid can then generate sulphite with metal oxide, work as dioxy
When change sulphur and sulfurous acid are oxidized to sulfur trioxide and sulfuric acid, metal oxide can be with sulfur trioxide, sulfuric acid reaction generation sulfuric acid
Salt.Meanwhile when nitric oxide acts on generation nitrogen dioxide because of catalytic adsorption, nitrogen dioxide and water generation nitric acid, nitric acid and gold
Belong to oxide reaction generation nitrate.
Denitrating flue gas principle is described below：
(1) NO reaches the surface of inorganic agent with flue gas, while NO is converted under the catalytic action of metal oxide active position
Into NO2, accelerate its removing.
(2)NO2Inorganic agent surface is reached, a part is adsorbed by surface；
(3) NO of processed agent adsorption2CaO reaction generation nitrite on gas, hydrone and surface, with cigarette
Oxygen, which reacts, in gas generates nitrate；A part of NO2Entered by inorganic agent hole inside inorganic agent；
(4) NO reacts inside inorganic agent with calcium oxide, generates nitrite, part nitrite is with entering hole
Oxygen react generation nitrate.
Flue gas desulfurization principle is described below：
(1)SO2Inorganic agent surface is reached with flue gas, a part is adsorbed by surface；
(2) active sites of inorganic agent promote SO in flue gas2Combined with oxygen to SO3Conversion；
(3) SO of processed agent adsorption2Reactive metal oxide generation sulfurous acid on gas, hydrone and surface
Oxygen, which reacts, in salt, with flue gas generates sulfate；A part of SO2Entered by inorganic agent hole inside inorganic agent：
(4)SO2Reacted inside inorganic agent with metal oxide, generate sulphite, part sulphite is with entering
Enter hole oxygen react generation sulfate.
In the present invention, described desulphurization denitration inorganic agent can be used directly, it is not necessary to slurries be formed, so as to be not required to
Want to complete the desulphurization denitration of flue gas in the case of a large amount of process waters, and do not produce a large amount of industrial wastes.
In certain embodiments, the content of sulfur dioxide of flue gas can be 300~40000mg/Nm3, be preferably 500~
30000mg/Nm3, more preferably 600~5000mg/Nm3.The content of nitrogen oxides can be 50~600mg/Nm3, be preferably
100~500mg/Nm3, more preferably 400~500mg/Nm3.Flow velocity can be 110~200 DEG C for 2~5m/s and temperature.It is excellent
Selection of land, the flow velocity of the flue gas is 2.5~3.5m/s and temperature is 135~140 DEG C., can be with by cigarette speed control in above range
Ensure that the dust stratification of fixed bed reactors is minimum, while ensure desulphurization denitration inorganic agent ash content is not worn in by flue gas.Above-mentioned cigarette
Gas parameter represents the parameter at smoke inlet；The parameter of smoke outlet is depending on practical sulphur removal situation.Using above-mentioned work
Skill parameter, be advantageous to obtain the accessory substance of steady quality, so as to be advantageous to the steady production of gypsum.
<Plaster formulation step>
Obtain siccative by the material comprising the accessory substance, diatomite, talcum powder and binding agent is well mixed, and by water with
The siccative mixing, then pouring molding obtains the gypsum.Optionally, maintenance and drying steps can also be included.Water is with doing
The weight ratio of material is 0.2~0.5, preferably 0.3~0.35.Described water is the industrial wastewater that pH is more than 5.Can so solve
Waste water handling problem.
In the present invention, the material includes 40~80 parts by weight, 25~35 parts by weight diatomite, 5~10 weights
Measure part talcum powder and 1~10 parts by weight binder.Preferably, the material includes 50~70 parts by weight, 25~30 weights
Measure part diatomite, 5~10 parts by weight talcum powder and 2~5 parts by weight binder.Accessory substance is that above-mentioned flue gas desulfurization and denitrification step obtains
The accessory substance obtained.Diatomite, talcum powder can use it is known in the art those.The binding agent be selected from cement, magnesium sulfate or
One kind or kind in magnesia；Preferably magnesium sulfate.Present invention discover that magnesium sulfate is particularly conducive to improve gypsum performance.
In certain embodiments, the material also includes 5~10 parts by weight additives, such as 5~8 parts by weight.Addition
Agent can be selected from the one or more in lignin water reducer, naphthalene sulfonic acids water reducer, benzene sulfonic acid water reducer or polycarboxylate water-reducer.
Preferably, additive is powdery polycarboxylic acid water reducer.
The material of the present invention can also include some industrial solid wastes, as long as not influenceing its combination property.Industry
Solid waste can be selected from the one or more in flyash, slag powders；Preferably flyash and/or slag powders.The present invention's
The example of slag powders includes but is not limited to clinker, slag, slag or scum after ball milling.Flyash is from the cigarette after coal combustion
The fine ash that catching is got off in gas, flyash are the primary solids wastes of coal-burning power plant's discharge.Slag is ironmaking, the slag of steel-making discharge
Material.According to an embodiment of the invention, the industrial solid wastes are selected from slag powders and fine coal of the granularity more than 200 mesh
Ash.
" part " in following examples represents parts by weight, unless specifically stated otherwise.In following examples, nano grade inorganic oxidation
The particle diameter of thing is 20nm；The particle diameter of micro inorganic oxide is 10 μm.
The performance of the gypsum of following examples is measured using JC/T 799-2007, by taking the finished product of 12mm thickness as an example
It is measured.
Embodiment 1
Each component is well mixed by the formula according to table 1 obtains solid mixture, is mixed with water, obtains half dry-mixing
Thing, hydraulic banded extruder is added, a diameter of 1.5mm is made, the cylindrical particle that length is 3mm, 105 DEG C of dryings, obtains desulfurization and take off
Nitre inorganic agent.Desulphurization denitration inorganic agent is filled in the reaction tube of shell and tube reactor, packed height is tube length of reaction tube
85%, the caliber of reaction tube is 50mm.
By flue gas by being placed with the reaction tube of the shell and tube reactor of the desulphurization denitration inorganic agent, carry out dry fume and take off
Sulphur denitration, so as to obtain accessory substance.Flow velocity is 3.5m/s, oxygen content 15vol%；The other specification of smoke inlet, flue gas
The parameter of outlet is as shown in tables 2 and 3.
Accessory substance, diatomite, talcum powder, binding agent (magnesium sulfate) and additive (powdery polycarboxylic acid water reducer) are mixed equal
It is even to obtain siccative, and the water is mixed with siccative (ratio of water to material 0.3), then pouring molding, maintenance and drying, obtain stone
Cream.
The formula of table 1, desulphurization denitration inorganic agent
Table 2, smoke inlet duty parameter
Table 3, exhanst gas outlet duty parameter
| Sequence number | Project | Quantity | Unit |
| 1 | Tower exiting flue gas amount (operating mode) | 824493 | m3/h |
| 2 | Exhaust gas temperature | 65 | ℃ |
| 3 | Sulfur dioxide emissioning concentration | 6.77 | mg/Nm3 |
| 4 | Discharged nitrous oxides concentration | 36.8 | mg/Nm3 |
| 5 | Export dust concentration | 15 | mg/Nm3 |
| 6 | The quantum of output of accessory substance | 4.5 | t/h |
The material proportion and the performance test results of gypsum are referring to table 4 and table 5.
The material proportion of table 4, gypsum
| Numbering | Accessory substance | Diatomite | Talcum powder | Binding agent | Additive |
| Embodiment 1 | 60 | 25 | 5 | 5 | 5 |
The performance test results of table 5, gypsum
Embodiment 2
(1) the desulphurization denitration inorganic agent using embodiment 1 and calandria type fixed bed progress flue gas dry desulfurizing denitration.Flow velocity
For 2.5m/s, oxygen content 15vol%；The other specification of smoke inlet, the parameter of exhanst gas outlet are as shown in tables 6 and 7.
(2) it is accessory substance, diatomite, talcum powder, binding agent (magnesium sulfate) and additive (powdery polycarboxylic acid water reducer) is mixed
Conjunction uniformly obtains siccative, and water is mixed with siccative (ratio of water to material 0.3), and then pouring molding, maintenance and drying, obtain stone
Cream.
Table 6, smoke inlet duty parameter
| Sequence number | Project | Quantity | Unit |
| 1 | Inlet flue gas amount (operating mode) | 1078078 | m3/h |
| 2 | Standard state exhaust gas volumn | 693175 | Nm3/h |
| 3 | Inlet temperature | 138 | ℃ |
| 4 | Sulfur dioxide entrance concentration | 622 | mg/Nm3 |
| 5 | Desulfuration efficiency | 99 | Wt% |
| 6 | Nitrogen oxides entrance concentration | 430 | mg/Nm3 |
| 7 | Denitration efficiency | 90 | Wt% |
| 8 | Entrance flue dust | 110 | mg/Nm3 |
| 9 | Efficiency of dust collection | 90 | Wt% |
| 10 | Humidity of flue gas | 5.3 | Wt% |
Table 7, exhanst gas outlet duty parameter
Gypsum material proportion and the performance test results are referring to table 8 and table 9.
Table 8, gypsum material proportion
| Numbering | Accessory substance | Diatomite | Talcum powder | Binding agent | Additive |
| Embodiment 2 | 56 | 29 | 5 | 5 | 5 |
Table 9, gypsum the performance test results
Embodiment 3
Each component is well mixed by the formula according to table 1 obtains solid mixture, is mixed with water, obtains half dry-mixing
Thing, half dry mixture is pressed into cellular, obtains cellular flue gas desulfurization and denitrification agent, pitch 7mm, and outer wall thickness is 1.5mm,
And interior wall thickness is 1mm.The desulphurization denitration inorganic agent of shaping is steamed under conditions of temperature is 185 DEG C and pressure is 1MPa
Vapour conserves, and is then dried at 105 DEG C.Desulphurization denitration inorganic agent is placed on fixed bed reactors.
By flue gas by being placed with the fixed bed reactors of the desulphurization denitration inorganic agent, flue gas dry desulfurizing denitration is carried out,
So as to obtain accessory substance.Flow velocity is 3.5m/s, oxygen content 15vol%.Smoke inlet parameter is referring to table 2.By accessory substance, silicon
Diatomaceous earth, talcum powder, binding agent (magnesium sulfate) and additive (powdery polycarboxylic acid water reducer) are well mixed to obtain siccative, and by described in
Water mixes with siccative (ratio of water to material 0.3), and then pouring molding, maintenance and drying, obtain gypsum.Gypsum material proportion and performance
Test result is referring to table 10 and table 11.
The material proportion of table 10, gypsum
| Numbering | Accessory substance | Diatomite | Talcum powder | Binding agent | Additive |
| Embodiment 3 | 60 | 25 | 5 | 5 | 5 |
The performance test results of table 11, gypsum
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 production method of gypsum, it is characterised in that comprise the following steps：
(1) flue gas is contacted with the desulphurization denitration inorganic agent being placed in fixed bed reactors, carries out dry desulfurization denitration, so as to
Form the accessory substance containing calcium sulfate and calcium nitrate；The desulphurization denitration inorganic agent aoxidizes including 10~25 parts by weight nano inorganics
Thing, 10~25 parts by weight micron inorganic oxides, 10~25 parts by weight magnesia and 20~35 parts by weight calcium oxide；Wherein, institute
The nano inorganic oxide stated is selected from SiO2、Fe2O3、Al2O3, CuO and MnO2In one or more, the inorganic oxygen of described micron
Compound is selected from SiO2、Fe2O3、Al2O3, CuO and MnO2In one or more；
(2) obtain siccative by the material comprising the accessory substance, diatomite, talcum powder and binding agent is well mixed, and by water with
The siccative mixing, then pouring molding obtains the gypsum.
2. production method according to claim 1, it is characterised in that the desulphurization denitration inorganic agent is graininess, and it is selected
From sheet-like particle, spherical particle or cylindrical particle；The thickness of the sheet-like particle is 5~10mm, and a diameter of 10~25mm；Institute
A diameter of 1~3mm of cylindrical particle is stated, and length is 3~8mm；A diameter of 2~5mm of the spherical particle.
3. production method according to claim 1, it is characterised in that the fixed bed reactors include multiple reaction tubes,
The desulphurization denitration inorganic agent is filled in the reaction tube, and the packed height is the 80~95% of tube length of reaction tube, is reacted
The caliber of pipe is 15~150mm, and the particle diameter of desulphurization denitration inorganic agent is less than 6 times of the caliber of reaction tube.
4. production method according to claim 1, it is characterised in that the oxygen content of the flue gas is 10~25vol%.
5. production method according to claim 1, it is characterised in that in step (1), the sulfur dioxide of the flue gas contains
Measure as 300~40000mg/Nm3, amount of nitrogen oxides be 100~600mg/Nm3, flue gas flow rate is 2~5m/s and temperature is
110~200 DEG C.
6. production method according to claim 1, it is characterised in that in step (1), described nano inorganic oxide bag
Include SiO2、Al2O3And MnO2；Described micron inorganic oxide includes SiO2、Al2O3And MnO2。
7. production method according to claim 6, it is characterised in that in described nano inorganic oxide, SiO2、
Al2O3And MnO2Weight ratio be 3~8:5~10:5~10；In described micron inorganic oxide, SiO2、Al2O3And MnO2
Weight ratio be 3~8:5~10:5~10.
8. according to the production method described in any one of claim 1~7, it is characterised in that in step (2), the material includes
40~80 parts by weight, 25~35 parts by weight diatomite, 5~10 parts by weight talcum powder and 1~10 parts by weight binder.
9. production method according to claim 8, it is characterised in that described material, which also includes 5~10 parts by weight, to be added
Agent；The additive in lignin water reducer, naphthalene sulfonic acids water reducer, benzene sulfonic acid water reducer or polycarboxylate water-reducer at least
It is a kind of；The one kind or kind of the binding agent in cement, magnesium sulfate or magnesia.
10. production method according to claim 9, it is characterised in that the weight of water and siccative ratio is 0.2~0.5, described
Water for pH be more than 5 industrial wastewater.
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| CN201710938288.0A CN107500710A (en) | 2017-09-30 | 2017-09-30 | The production method of gypsum |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102824844A (en) * | 2012-09-11 | 2012-12-19 | 北京世能中晶能源科技有限公司 | Desulfurization and denitrification agent, preparation method and application thereof |
| CN103553526A (en) * | 2013-10-16 | 2014-02-05 | 上海利物宝建筑科技有限公司 | Gypsum-based door and window seam filling and sealing mortar as well as preparation method and application thereof |
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2017
- 2017-09-30 CN CN201710938288.0A patent/CN107500710A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102824844A (en) * | 2012-09-11 | 2012-12-19 | 北京世能中晶能源科技有限公司 | Desulfurization and denitrification agent, preparation method and application thereof |
| CN103553526A (en) * | 2013-10-16 | 2014-02-05 | 上海利物宝建筑科技有限公司 | Gypsum-based door and window seam filling and sealing mortar as well as preparation method and application thereof |
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