CN106630709B - A kind of method of the dry ardealite of sulfuric acid tail gas - Google Patents
A kind of method of the dry ardealite of sulfuric acid tail gas Download PDFInfo
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- CN106630709B CN106630709B CN201610849095.3A CN201610849095A CN106630709B CN 106630709 B CN106630709 B CN 106630709B CN 201610849095 A CN201610849095 A CN 201610849095A CN 106630709 B CN106630709 B CN 106630709B
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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
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
- C04B11/036—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained for the dry process, e.g. dehydrating in a fluidised bed or in a rotary kiln, i.e. to obtain beta-hemihydrate
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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
- B01D53/26—Drying gases or vapours
- B01D53/263—Drying gases or vapours by absorption
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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
- B01D53/26—Drying gases or vapours
- B01D53/28—Selection of materials for use as drying agents
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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
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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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- 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
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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
- B01D2251/604—Hydroxides
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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
- B01D2251/606—Carbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/50—Combinations of absorbents
- B01D2252/504—Mixtures of two or more absorbents
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- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
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Abstract
The present invention relates to gypsum technical field of drying, a kind of method for specifically disclosing dry ardealite of sulfuric acid tail gas.This method comprising the following specific steps (1) sulfuric acid tail gas processing: sulfuric acid tail gas is passed through tower lye device and is neutralized；(2) dry: the outlet of tower lye device is connected with triple valve, the outlet of tower lye device is connected with ardealite drying bed, tail gas funnel respectively by triple valve, the connection relationship of tower lye device and ardealite drying bed, tail gas funnel is adjusted by the valve on regulating three-way valve, to according to whether dry ardealite to regulate and control the flow direction of the sulfuric acid tail gas after neutralisation treatment.This method makes full use of the heat contained by tail gas that ardealite is dried, and device is simple, easy to operate, and drying efficiency and dries quantity are improved while reducing drying cost.
Description
[technical field]
The present invention relates to gypsum technical field of drying, and in particular to a kind of method of the dry ardealite of sulfuric acid tail gas.
[background technique]
When the solid slag, i.e. Wet-process phosphoric acid (WPPA) that ardealite generates when referring in phosphoric acid production with sulfuric acid treating phosphorite
Resulting byproduct, main component are calcium sulfate.Production 1t phosphoric acid about generates 4.5~5t ardealite.In recent years, with phosphate fertilizer
The development of industry, the discharge amount of ardealite also increasingly increase.The discharge amount of the annual ardealite in China is more than 10,000,000 t, and it is utilized
Rate is but very low, and ardealite occupies a large amount of soils, pollutes environment, very big burden, the resource of ardealite are brought to manufacturing enterprise
Change and utilizes the key for having become phosphate fertilizer industry realization sustainable development.
And the application study of China's ardealite is started late, the utilization of ardealite mainly has following approach at present:
(1) by the pretreatment modification to ardealite, the natural gypsum can be replaced to be applied to cement, gypsum building material product
Production in；
(2) deficiency using ardealite production sulfuric acid, cement to make up China's Sulphur ressource；
(3) make soil conditioner and fertilizer.
Due to generally using Wet-process phosphoric acid (WPPA), so as to contain moisture more for resulting ardealite, it therefore, be to ardealite
Make further development and utilization, it is necessary to first ardealite be dried.Currently known ardealite drying means adds for fuel
Heated drying method is natural with regard to seasoning.Fuel heat drying method drying rate is fast, but fuel source consumption is big, burning generates has
Malicious tail gas pollution atmosphere, drying cost are high；Natural seasoning drying cost is low, but drying efficiency is low, the time is long.
[summary of the invention]
Goal of the invention of the invention is: in view of the above problems, providing a kind of dry ardealite of sulfuric acid tail gas
Method.This method makes full use of the heat contained by tail gas that ardealite is dried, and device is simple, easy to operate,
Drying efficiency and dries quantity are improved while reducing drying cost.
To achieve the goals above, The technical solution adopted by the invention is as follows:
A kind of method of the dry ardealite of sulfuric acid tail gas, comprising the following specific steps
(1) processing of sulfuric acid tail gas: sulfuric acid tail gas is passed through tower lye device and is neutralized；
(2) dry:
The outlet of tower lye device is connected with triple valve, and the outlet of tower lye device is dried with ardealite respectively by triple valve
Dry bed, tail gas funnel are connected, and tower lye device and ardealite drying bed, tail gas are adjusted by the valve on regulating three-way valve
The connection relationship of chimney, thus to regulate and control the flow direction of the sulfuric acid tail gas after neutralisation treatment；
It, then will be even by the closedown of pipeline of the outlet tail gas funnel of tower lye device when needing to dry ardealite
The outlet of logical tower lye device is connected to the pipeline of ardealite drying bed, and the sulfuric acid tail gas after neutralisation treatment is allowed to lead to ardealite baking
Dry bed carries out drying and processing to ardealite；After the completion of ardealite drying, by the outlet of tower lye device and ardealite drying bed
Closedown of pipeline, the outlet of tower lye device is connected to the pipeline of tail gas funnel, the sulfuric acid tail gas after neutralisation treatment is allowed to lead to
Tail gas funnel discharges outward.
Further, in step (2), the valve on the triple valve is made of inner spool, by changing inner spool
Position, change the link position of the inlet and outlet of triple valve；Valve on the triple valve can also be by threeway
One ball valve is installed respectively to regulate and control the link position of the inlet and outlet of triple valve in two exits of valve.
Further, in step (2), the sulfuric acid tail gas after neutralisation treatment leads to ardealite drying bed and dries to ardealite
It further include that sulfuric acid tail gas carries out except water process to neutralizing that treated before dry-cure.
Further, the deicer used except water process includes the raw material components of following parts by weight: calcium chloride 12-
18 parts, 10-15 parts of 4A molecular sieve, 6-12 parts of calcium oxide and 2-4 parts of zeolite.
Further, in step (1), the sulfuric acid tail gas treated temperature is 60-80 DEG C.
Further, in step (1), the tower lye is sodium hydroxide or calcium carbonate.
Further, in step (2), the length of the ardealite drying bed is 0.8-1.2m, ardealite with a thickness of 1-
2cm。
Further, in step (2), the drying time is 1-3min.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
(1) present invention takes full advantage of heat contained in sulfuric acid tail gas ardealite to be dried, and exhaust gas is sharp again
With improving the utilization rate of the energy, increase economic benefit.By lye sodium hydroxide or carbonic acid Calcium treatment, not only neutralizes and divide
The sulfur sesquioxide acid mist in sulfuric acid tail gas has been solved, sulfuric acid tail gas has been purified, has greatly reduced the pollution to atmosphere；And
And absorb the moisture in sulfuric acid tail gas, sulfuric acid tail gas is drier so that contained only in treated sulfuric acid tail gas nitrogen dioxide,
A small amount of oxygen and water.
Sulfuric acid tail gas before being dried to ardealite except water process be with calcium chloride, 4A molecular sieve, calcium oxide and
Zeolite carries out second dehydration by the deicer that scientific matching makes.Each ingredient synergistic effect in deicer, has efficient
Acid-mist-removing, high-efficiency water-absorbing and exothermic function, in sulfuric acid tail gas acid mist and moisture carry out double absorption neutralization, substantially reduce
The dustiness and water content of sulfuric acid tail gas, and calcium oxide absorbs water heat release, and the heat of releasing heats sulfuric acid tail gas, sulphur
The temperature of sour tail gas increases, and improves drying rate and drying efficiency.
In addition, the vapor generated when drying to ardealite can be absorbed in the calcium oxide in pipeline, greatly reduce
Humidity in ardealite drying pipeline, it is therefore prevented that secondary moist phenomenon is generated when drying, to further improve drying speed
Degree, drying efficiency and dries quantity.And the zeolite being added, the issuable bumping of heat release is existing when can prevent calcium oxide from absorbing water
As improving the safety coefficient of deicer.
(2) present invention controls the emission direction of sulfuric acid tail gas using triple valve, simple and fast, easily controllable, reduces people
The investment of power material resources, reduces drying cost, to improve economic benefit.
[specific embodiment]
The present invention is further illustrated combined with specific embodiments below.
Embodiment 1
1. preparing before drying
A) length of drying bed is 0.8m；
B) ardealite with a thickness of 1cm；
C) tower lye is sodium hydroxide.
2. being dried according to the following steps with sulfuric acid tail gas to ardealite:
(1) processing of sulfuric acid tail gas: sulfuric acid tail gas is passed through tower lye device and is neutralized；
(2) dry: ardealite drying pipeline valve is opened, processed sulfuric acid tail gas is allowed to first pass through de-watering apparatus water removal,
Lead to ardealite drying bed again to be dried, dries 1min；
Ardealite drying is completed, tail gas funnel valve is opened, processed sulfuric acid tail gas is allowed to lead to tail gas funnel to outlet
It puts.
Embodiment 2
1. preparing before drying
A) length of drying bed is 1.0m；
B) ardealite with a thickness of 1.5cm；
C) tower lye is sodium hydroxide.
2. being dried according to the following steps with sulfuric acid tail gas to ardealite:
(1) processing of sulfuric acid tail gas: sulfuric acid tail gas is passed through tower lye device and is neutralized；
(2) dry: ardealite drying pipeline valve is opened, processed sulfuric acid tail gas is allowed to first pass through de-watering apparatus water removal,
Lead to ardealite drying bed again to be dried, dries 2min；
Ardealite drying is completed, tail gas funnel valve is opened, processed sulfuric acid tail gas is allowed to lead to tail gas funnel to outlet
It puts.
Embodiment 3
1. preparing before drying
A) length of drying bed is 1.2m
B) ardealite with a thickness of 2cm；
C) tower lye is calcium carbonate.
2. being dried according to the following steps with sulfuric acid tail gas to ardealite:
(1) processing of sulfuric acid tail gas: sulfuric acid tail gas is passed through tower lye device and is neutralized；
(2) dry: ardealite drying pipeline valve is opened, processed sulfuric acid tail gas is allowed to first pass through de-watering apparatus water removal,
Lead to ardealite drying bed again to be dried, dries 3min；
Ardealite drying is completed, tail gas funnel valve is opened, processed sulfuric acid tail gas is allowed to lead to tail gas funnel to outlet
It puts.
Compliance test result 1: being dried by 1,2 and 3 pair of ardealite of embodiment, and to certain experiment numbers of dry whole process
According to being measured.
1. the measurement of ardealite water content after dry, the results are shown in Table 1:
Table 1
| Measurement result | Criterion of acceptability | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Water content (%) | ≤10 | 8.1 | 7.6 | 7.7 |
As can be seen from Table 1, the ardealite water content that 3 embodiments of the invention are dried≤10%, meets storage
It deposits and processing criterion.
2. tail gas aqueous amount and temperature after dehydrater removes water, the results are shown in Table 2:
Table 2
| Measurement result | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Water content (%) | 1.3 | 1.0 | 1.2 |
| Temperature (DEG C) | 78-83 | 79-84 | 80-86 |
It can be obtained by table 2, after dehydrater removes water, the water content of tail gas is very low, is below 1.3%；Also, the temperature of tail gas
It spends compared to 60-80 DEG C obtained by tower lye, has been improved, highest can increase 26 DEG C.It is thus possible to improve the speed of drying
Degree and efficiency.
3. drying is completed, the humidity in ardealite drying pipeline is measured, the results are shown in Table 3:
Table 3
| Measurement result | The air humidity of Arid Area | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Humidity (%) | 20-30 | 8-10 | 7-9 | 7-10 |
As can be seen from Table 3, humidity is below 12% in the pipeline after three embodiment drying of the present invention, compares Arid Area
The low 9-19% of air humidity, illustrate that the steam generated in drying course is oxidized calcium good absorption；And in pipeline
Humidity and drying after ardealite humidity it is almost the same, effectively prevent the secondary of ardealite and get damp, improve drying efficiency and
Dries quantity.
Compliance test result 2: after tower base extraction, with the calcium chloride of equivalent, 4A molecular sieve, calcium oxide and of the invention
Deicer carries out redrying to sulfuric acid tail gas respectively.In the case where remaining is consistent, sulfuric acid tail after measurement is dry respectively
Water content, sulphuric acid mist content, the mean temperature of gas, the results are shown in Table 4:
Table 4
| As a result it counts | Calcium chloride | 4A molecular sieve | Calcium oxide | Deicer of the invention |
| Water content | 8.6 | 6.8 | 7.1 | 1.0 |
| Sulphuric acid mist content (%) | 2.6 | 2.5 | 2.5 | 0 |
| Mean temperature (DEG C) | 69 | 68 | 78 | 84 |
It can be obtained by table 4, after the dry sulfuric acid tail gas of deicer of the invention, the water content content of sulfuric acid tail gas is only 1.0%,
Sulphuric acid mist content is 0, the low 5.8-7.6% and 2.5- of sulfuric acid tail gas water content and sulphuric acid mist content after than remaining 3 groups dryings
2.6%；And the mean temperature after the dry sulfuric acid tail gas of deicer of the invention is 6-16 DEG C higher than remaining 3 groups.Illustrate the present invention
Deicer in each ingredient there is synergistic effect, water absorbing capacity can be enhanced, increase to the degree of purification of sulfuric acid tail gas, while can
With the temperature of raising sulfuric acid tail gas after dry, accelerate the drying rate of ardealite.
Above description is the detailed description for the present invention preferably possible embodiments, but embodiment is not limited to this hair
Bright patent claim, it is all the present invention suggested by technical spirit under completed same changes or modifications change, should all belong to
In the covered the scope of the patents of the present invention.
Claims (6)
1. a kind of method of the dry ardealite of sulfuric acid tail gas, which is characterized in that comprising the following specific steps
(1) processing of sulfuric acid tail gas: sulfuric acid tail gas is passed through tower lye device and is neutralized；
(2) dry:
The outlet of tower lye device is connected with triple valve, and the outlet of tower lye device is dried with ardealite respectively by triple valve
Bed, tail gas funnel are connected, and tower lye device and ardealite drying bed, exhaust smoke are adjusted by the valve on regulating three-way valve
The connection relationship of chimney, thus to regulate and control the flow direction of the sulfuric acid tail gas after neutralisation treatment；
When needing to dry ardealite, by the closedown of pipeline of the outlet tail gas funnel of tower lye device, tower then will be connected to
The outlet of lye device is connected to the pipeline of ardealite drying bed, and the sulfuric acid tail gas after neutralisation treatment is first allowed to carry out by deicer
After water process, then leads to ardealite drying bed and drying and processing is carried out to ardealite；After the completion of ardealite drying, by tower lye
The outlet of device and the closedown of pipeline of ardealite drying bed, the outlet of tower lye device is connected to the pipeline of tail gas funnel, is allowed
Sulfuric acid tail gas after neutralisation treatment leads to tail gas funnel and discharges outward；Wherein, the deicer includes the raw material of following parts by weight
Component: 12-18 parts of calcium chloride, 10-15 parts of 4A molecular sieve, 6-12 parts of calcium oxide and 2-4 parts of zeolite.
2. the method for the dry ardealite of a kind of sulfuric acid tail gas according to claim 1, which is characterized in that described in step (2)
Valve on triple valve is made of inner spool, by changing the position of inner spool, changes the inlet and outlet of triple valve
Link position；Valve on the triple valve can also be by two exits in triple valve install respectively a ball valve come
Regulate and control the link position of the inlet and outlet of triple valve.
3. the method for the dry ardealite of a kind of sulfuric acid tail gas according to claim 1, which is characterized in that described in step (1)
Sulfuric acid tail gas treated temperature is 60-80 DEG C.
4. the method for the dry ardealite of a kind of sulfuric acid tail gas according to claim 1, which is characterized in that described in step (1)
Tower lye is sodium hydroxide.
5. the method for the dry ardealite of a kind of sulfuric acid tail gas according to claim 1, which is characterized in that described in step (2)
The length of ardealite drying bed be 0.8-1.2m, ardealite with a thickness of 1-2cm.
6. the method for the dry ardealite of a kind of sulfuric acid tail gas according to claim 1, which is characterized in that described in step (2)
Drying time is 1-3min.
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| CN101186454A (en) * | 2007-12-19 | 2008-05-28 | 龚家竹 | Energy-saving drying production method for gypsum |
| CN101234857A (en) * | 2008-02-29 | 2008-08-06 | 江苏瑞和化肥有限公司 | Method for drying granular phosphogypsum by using sulfuric acid tail gas |
| CN102243923A (en) * | 2010-05-14 | 2011-11-16 | 福盈科技化学股份有限公司 | Dye sensitized solar cell with dehydration mechanism |
| CN102261830A (en) * | 2011-06-24 | 2011-11-30 | 刘宏 | Method for drying ammonium phosphate by using tail gas of sulfuric acid |
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