CN105883807A - Method for purifying carbon dioxide as by-product in magnesite processing - Google Patents
Method for purifying carbon dioxide as by-product in magnesite processing Download PDFInfo
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- CN105883807A CN105883807A CN201610224339.9A CN201610224339A CN105883807A CN 105883807 A CN105883807 A CN 105883807A CN 201610224339 A CN201610224339 A CN 201610224339A CN 105883807 A CN105883807 A CN 105883807A
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- activated carbon
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention provides a method for purifying carbon dioxide as a by-product in magnesite processing. The method comprises the following steps: waste carbon dioxide and oxygen-rich gas are mixed and combusted in a combustion chamber at the combustion temperature of 100-200 DEG C, and combusted carbon dioxide is obtained; combusted carbon dioxide passes through a first filter tower filled with first activated carbon, and first filtered carbon dioxide is obtained; first filtered carbon dioxide passes through a water washing tower, and water washed carbon dioxide is obtained; water washed carbon dioxide passes through an evaporation tower at the evaporation temperature of 60-80 DEG C, and evaporated carbon dioxide is obtained; evaporated carbon dioxide passes through a condensing tower at the condensing temperature of the carbon dioxide liquefaction temperature plus or minus 2 DEG C, and liquid carbon dioxide is obtained; liquid carbon dioxide passes through a second filter tower filled with second activated carbon, and second filtered carbon dioxide is obtained. The method has the advantages that the process is simple, the energy consumption is low, and the food-grade carbon dioxide can be prepared directly from carbon dioxide as the by-product in magnesite processing.
Description
Technical field
The present invention relates to the process technology of magnesite side-product carbon dioxide, more particularly to purification
The method of the carbon dioxide of the side-product in processing as magnesite.
Background technology
China's magnesite resource enriches, widely distributed.Can according to the primary response formula in magnesite fusion process
With estimation, often produce the magnesium oxide finished product of 1t, the carbon dioxide of 1.1t will be supervened.Example
As, only as a example by Liaoning Province in 2013 produces magnesium oxide product, this province produces magnesium oxide every year and is
7.837 × 106t, calculates with this, supervenes 8.661 × 106t carbon dioxide, it can be seen that, Pedicellus et Pericarpium Trapae
The annual CO2 emissions of magnesium mining industry are the hugest.But, now with a lot of mining companies
During producing magnesium oxide, carbon dioxide by-product processing produced is at simple dedusting
Reason, is directly discharged in air, causes the biggest ambient pressure.It addition, converge at some Mining Enterprises
Always, currently also have and carbon dioxide is carried out trapping technique, wherein use for example with high-pressure process (8.0
MPa), the method remains high due to the power consumption of compressor, causes the Main Bottleneck of its development of restriction；
On the other hand, if using low-pressure process (1.6MPa～2.5MPa), the power consumption of compressor wants little obtaining relatively
Many, however it is necessary that repeatedly throttling expansion blood pressure lowering to obtain extra cold, there is substantial amounts of energy in throttling process
Amount loss.
The carbon dioxide composition that magnesite processing produces composition compared with other sources is relative complex, existing
There is technique to be difficult to therefrom purification and must reach the carbon dioxide of food stage.The dioxy obtained that main cause is
Change carbon purity low, typically have to the carbon dioxide of 95 volume % purity, do not reach food stage at all
(99.9) standard, does not the most know exactly which that what composition causes on earth and cannot obtain from Pedicellus et Pericarpium Trapae
Magnesium ore deposit processed side product carbon dioxide obtains food-grade carbon-dioxide.As far as the applicant is aware, there is presently no
The report of food-grade carbon-dioxide is obtained from magnesite processed side product carbon dioxide direct purification.
Therefore, it is highly desirable at present to be eaten from magnesite processed side product carbon dioxide direct purification
The method of grade carbon dioxide.
Summary of the invention
The invention aims to solve magnesite processed side product carbon dioxide cannot obtain by direct purification
Technical problem to food-grade carbon-dioxide.To this end, the present inventor gropes research through long-term, it is provided that
Following solution.
Specifically, the invention provides the side-product carbon dioxide during a kind of purification is processed as magnesite
Method, described method comprises the steps:
(1) by the CO 2 waste gas processed from magnesite and rich in oxygen gas mix and at 100 DEG C
Burn in combustor to the ignition temperatures of 200 DEG C, obtain burn carbon dioxide, wherein by described rich in
Oxygen in oxygen gas is maintained at the water being calculated as 20 volume % to 30 volume % with the volume of described waste gas
Flat；
(2) make burning carbon dioxide by being filled with the first filtration tank of the first activated carbon, obtain first
Filtering carbon dioxide；
(3) make the first filtering carbon dioxide by water scrubber, obtain washing carbon dioxide；
(4) pass through evaporating column by washing the carbon dioxide evaporating temperature at 60 DEG C to 80 DEG C, evaporated
Carbon dioxide；
(5) the evaporation carbon dioxide condensation temperature in co 2 liquefaction temperature ± 2 DEG C is passed through condensing tower,
Obtain liquid CO 2；
(6) by liquid CO 2 by being filled with the second filtration tank of the second activated carbon, second is obtained
Filtering carbon dioxide；
Wherein, described first activated carbon has 1500m2/ g to 2500m2The surface area of/g, and described
Second activated carbon has 1200m2/ g to 1600m2The surface area of/g；
Wherein, the aperture in the hole existing for described first activated carbon: mesopore: the volume ratio of macropore is
Aperture in 1:1.0～2.0:0.4～0.8, and the hole existing for described first activated carbon: mesopore: macropore
Volume ratio be 1:0.6～0.8:0.2～0.4, wherein said aperture be aperture be the hole of below 5nm, institute
State mesopore be aperture be more than 5nm and less than the hole of 100nm, described macropore be aperture be 100nm
Above hole.
The present invention by optimizing on the basis of filtration activated carbon, by high-temp combustion, low-temperature evaporation,
One step condensation, two steps filter, thus provide that a kind of technique is simple, energy consumption is relatively low and can be from
The method that magnesite processed side product carbon dioxide directly prepares food-grade carbon-dioxide.
Accompanying drawing explanation
Fig. 1 is the work that the present invention utilizes magnesite processed side product carbon dioxide purification food-grade carbon-dioxide
Process flow figure.
Detailed description of the invention
Directly can make from magnesite processed side product carbon dioxide as it has been described above, the invention provides one
The method of standby food-grade carbon-dioxide.Described method can include combustion step, the first filtration step, water
Washing step, evaporation step, condensing tower step and the second filtration step, these steps can be respectively in burning
Room, the first filtration tank, water scrubber, evaporating column, condensing tower and the second filtration tank carry out (referring to Fig. 1).
More specifically, described method comprises the steps:
(1) by the CO 2 waste gas processed from magnesite and rich in oxygen gas mix and at 100 DEG C
Burn in combustor to the ignition temperatures of 200 DEG C, obtain burn carbon dioxide, wherein by described rich in
Oxygen in oxygen gas is maintained at the water being calculated as 20 volume % to 30 volume % with the volume of described waste gas
Flat；
(2) make burning carbon dioxide by being filled with the first filtration tank of the first activated carbon, obtain first
Filtering carbon dioxide；
(3) make the first filtering carbon dioxide by water scrubber, obtain washing carbon dioxide；
(4) pass through evaporating column by washing the carbon dioxide evaporating temperature at 60 DEG C to 80 DEG C, evaporated
Carbon dioxide；
(5) the evaporation carbon dioxide condensation temperature in co 2 liquefaction temperature ± 2 DEG C is passed through condensing tower,
Obtain liquid CO 2；
(6) by liquid CO 2 by being filled with the second filtration tank of the second activated carbon, second is obtained
Filtering carbon dioxide.
In step (1), mainly by magnesite side-product carbon dioxide (hereinafter sometimes referred to raw material
Carbon dioxide) in flammable impurity change into gaseous matter.If ignition temperature is too low, it is impossible to combine
Other steps of the inventive method obtain the carbon dioxide with food stage purity；If temperature is too high, then
Energy consumption is excessive and there is no need.
The main purpose of step (2) is tentatively to remove impurity before washing, avoids impurity therein simultaneously
Water scrubber is polluted and even corrodes.
The main purpose of step (3) utilizes this cheap solvent of water to wash water dissolvable impurity off, such as three
Sulfur oxide, hydrogen chloride generally removes by directly contacting with water with fluohydric acid gas.
The main purpose of step (4) is to remove less than 80 DEG C nonvolatile impurity.
The purpose of step (5) is by miscellaneous less than other of carbon dioxide for condensing temperature in carbon dioxide
Matter removes, and simultaneously by co 2 liquefaction so that storing, atmospheric carbon dioxide needs to account for much bigger after all
Space.
Step (6) is that liquid carbon dioxide is carried out further purification, the inventors discovered that, in step
The purity of the liquid CO 2 suddenly obtained in (5) typically can only achieve 99 volume about %, distance food
Rank test (99.9 volume %) or a certain distance, it addition, total sulfur content is also unable to reach food
(volume fraction of total sulfur is 0.1X10 in the requirement of level-6).Therefore step (6) is the most also
It is necessary.
The inventors discovered that, in the method system of the present invention, using activated carbon two step to filter partition method can
To remove the impurity in feed carbon dioxide well, to realize the standard of food-grade carbon-dioxide.And,
Need to use different activated carbons to filter in step (2) and (6).Wherein, in step (2)
Described first activated carbon used has 1500m2/ g to 2500m2The surface area of/g, and described second
Activated carbon has 1200m2/ g to 1600m2The surface area of/g.And, existing for described first activated carbon
Hole in aperture: mesopore: the volume ratio of macropore is 1:1.0～2.0:0.4～0.8, described first activity
The aperture in hole existing for charcoal: mesopore: the volume ratio of macropore is 1:0.6～0.8:0.2～0.4, wherein
Described aperture be aperture be the hole of below 5nm, described mesopore be aperture be more than 5nm and to be less than
The hole of 100nm, described macropore be aperture be the hole of more than 100nm.
Source and the manufacture method of activated carbon are had no particular limits by the present invention, and such as activated carbon can make
Manufacturing with various carbon raw materials by methods known in the art, such as, activated carbon can be with brown coal, wood
Material, peat and other material with carbon elements manufacture.Such as, the method manufacturing activated carbon can include that physics is lived
Change (carbon raw material carbonization then being aoxidized) and chemical activation.It addition, activated carbon is by being commercially available.
Can be to use the activated carbon of the forms such as powdered active carbon, granular active carbon and NACF.But
It is to the inventors discovered that, suitable porosity and hole composition, highly purified to feed carbon dioxide
It is a need for.In the present invention, described first activated carbon can have 1500m2/g、1600m2/g、
1700m2/g、1800m2/g、1900m2/g、2000m2/g、21000m2/g、2200m2/g、2300
m2/g、2400m2/ g or 2500m2/g.Described second activated carbon can have 1200m2/g、1300m2/g、
1400m2/g、1500m2/ g or 1600m2/g.It addition, in hole existing for described first activated carbon
Aperture: mesopore: the volume ratio of macropore needs for 1:1.0～2.0:0.4～0.8, described first activated carbon institute
Aperture in the hole existed: mesopore: the volume ratio of macropore is 1:0.6～0.8:0.2～0.4, wherein said
Aperture be aperture be the hole of below 5nm, described mesopore be aperture be more than 5nm and less than 100nm
Hole, described macropore be aperture be the hole of more than 100nm.
In some embodiments, described first activated carbon has 1800m2/ g to 2000m2The surface of/g
Amass, and/or described second activated carbon has 1300m2/ g to 1500m2The surface area of/g.
In some embodiments, described first activated carbon and/or described second activated carbon are steam activation
Activated carbon.
In some embodiments, described first activated carbon and/or described second activated carbon independently selected from by
Peat activated carbon, wood activated charcoal, brown coal activated carbon and the group of bituminous coal activated carbon composition.
In some embodiments, the aperture of described first activated carbon: mesopore: macropore is 1:1.5:0.6,
And it is the brown coal activated carbon of steam activation.
In some embodiments, the aperture of described second activated carbon: mesopore: macropore is 1:0.7:0.3,
And it is the peat activated carbon of steam activation.
The methylene blue adsorbance level of this activated carbon can be used to characterize activated carbon adsorptive capacity.At some
In preferred embodiment, described first activated carbon has the methylene blue adsorbance of 15g/100g.Separately
Outer preferred embodiment in, described first activated carbon has the methylene blue adsorbance of 25g/100g.
In some embodiments, the ignition temperature in step (1) is 150 DEG C, and described rich in oxygen
Oxygen in gas gas is calculated as the level of 25 volume % with the volume of described waste gas.It addition, step (4)
In evaporating temperature be 70 DEG C.
Hereafter by the way of embodiment, the present invention will be further detailed.
Embodiment 1
Being prepared about 500L, by magnesite, the feed carbon dioxide produced during magnesium oxide and waiting body
Long-pending air arrives combustor through the premixer being equipped with aerator, and the temperature of combustor is heated up
To 150 DEG C and in this temperature holding time of 10 minutes.To be switched to be filled with through the gas of burning
First activated carbon (purchased from Xianyang Hong Feng furnace equipment company limited) a diameter of 1 meter and height be
In first filtration tank of 5 meters, then be switched to a diameter of 1 meter and height be 6 meters (height of water is 5 meters)
Water scrubber tower at the bottom of entrance, receive from the tower top outlet of water scrubber, with the first filtration tank, there is same size
Condensing tower in, wherein the condensation temperature of condensing tower is controlled the temperature of condensing temperature ± 2 DEG C at carbon dioxide
In the range of degree.Then making the liquid CO 2 obtained flow through, to be filled with the second activated carbon (salty purchased from Shaanxi
Yang Hongfeng furnace equipment company limited) the second filtration tank (a size of first filtration tank identical), from
And obtain final food-grade carbon-dioxide.According to the method described in GB 10621-2006 to liquid dioxy
Change carbon to be analyzed.Result sees table 2 below.
Embodiment 2 to 13
In addition to the content described in table 1 below, mode same as in Example 1 is used to carry out embodiment 2
To 13.Result sees table 2 below.
Table 1
* hole composition: wherein said aperture be aperture be the hole of below 5nm, described mesopore be aperture be big
In 5nm and less than the hole of 100nm, described macropore be aperture be the hole of more than 100nm.
-: do not detect.
Table 2
From the results shown in Table 2, the inventive method can manufacture and have the dioxy meeting food grade standard
Change the volume fraction (%) of carbon, the volume fraction (10 of total sulfur-6), the volume fraction (10 of moisture-6) and oxygen
The volume fraction (10 of gas-6) carbon dioxide.
Claims (10)
1. a method for the carbon dioxide of the side-product during purification is processed as magnesite, its feature exists
In, described method comprises the steps:
(1) by the CO 2 waste gas processed from magnesite and rich in oxygen gas mix and at 100 DEG C
Burn in combustor to the ignition temperatures of 200 DEG C, obtain burn carbon dioxide, wherein by described rich in
Oxygen in oxygen gas is maintained at the water being calculated as 20 volume % to 30 volume % with the volume of described waste gas
Flat；
(2) make burning carbon dioxide by being filled with the first filtration tank of the first activated carbon, obtain first
Filtering carbon dioxide；
(3) make the first filtering carbon dioxide by water scrubber, obtain washing carbon dioxide；
(4) pass through evaporating column by washing the carbon dioxide evaporating temperature at 60 DEG C to 80 DEG C, evaporated
Carbon dioxide；
(5) the evaporation carbon dioxide condensation temperature in co 2 liquefaction temperature ± 2 DEG C is passed through condensing tower,
Obtain liquid CO 2；
(6) by liquid CO 2 by being filled with the second filtration tank of the second activated carbon, second is obtained
Filtering carbon dioxide；
Wherein, described first activated carbon has 1500m2/ g to 2500m2The surface area of/g, and described
Second activated carbon has 1200m2/ g to 1600m2The surface area of/g；
Wherein, the aperture in the hole existing for described first activated carbon: mesopore: the volume ratio of macropore is
Aperture in 1:1.0～2.0:0.4～0.8, and the hole existing for described second activated carbon: mesopore: macropore
Volume ratio be 1:0.6～0.8:0.2～0.4, wherein said aperture be aperture be the hole of below 5nm, institute
State mesopore be aperture be more than 5nm and less than the hole of 100nm, described macropore be aperture be 100nm
Above hole.
Method the most according to claim 1, it is characterised in that:
Ignition temperature in step (1) is 150 DEG C, and described rich in the oxygen in oxygen gas with institute
The volume stating waste gas is calculated as the level of 25 volume %；And/or
Evaporating temperature in step (4) is 70 DEG C.
3. according to the method according to any one of claim 1 or 2, it is characterised in that described first
Activated carbon has 1800m2/ g to 2000m2The surface area of/g, and/or described second activated carbon has 1300
m2/ g to 1500m2The surface area of/g.
Method the most according to claim 1 and 2, it is characterised in that described first activated carbon and/
Or described second activated carbon is the activated carbon of steam activation.
Method the most according to claim 1 and 2, it is characterised in that described first activated carbon and/
Or described second activated carbon is independently selected from by peat activated carbon, wood activated charcoal, brown coal activated carbon and cigarette
The group of coal activity charcoal composition.
Method the most according to claim 1 and 2, it is characterised in that described first activated carbon
Aperture: mesopore: macropore is 1:1.5:0.6, and be the brown coal activated carbon of steam activation.
Method the most according to claim 1 and 2, it is characterised in that described second activated carbon
Aperture: mesopore: macropore is 1:0.7:0.3, and be the peat activated carbon of steam activation.
Method the most according to claim 1 and 2, it is characterised in that described first activated carbon tool
There is the methylene blue adsorbance of 15g/100g.
Method the most according to claim 1 and 2, it is characterised in that described second activated carbon tool
There is the methylene blue adsorbance of 25g/100g.
Method the most according to claim 1 and 2, it is characterised in that described first activated carbon tool
There is the described aperture of 0.4mL/g；And/or described second activated carbon has the described aperture of 0.6mL/g.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112023602A (en) * | 2020-11-03 | 2020-12-04 | 小跃科技(北京)有限公司 | Purifier to carbon dioxide dust removal edulcoration |
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| CN112023602B (en) * | 2020-11-03 | 2021-05-28 | 小跃科技(北京)有限公司 | Purifier to carbon dioxide dust removal edulcoration |
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Effective date of registration: 20200902 Address after: 41-11-2, No. 17, yingnaili, Dashiqiao City, Yingkou City, Liaoning Province, 115100 Patentee after: Liu Xin Address before: No.17, yingnaili, Dashiqiao, Yingkou, Liaoning Province 41-03-6 Patentee before: Yao Shengduo |
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