CN105948076B - A kind of method that sequestration of carbon dioxide produces light magnesium carbonate co-production ammonium chloride - Google Patents
A kind of method that sequestration of carbon dioxide produces light magnesium carbonate co-production ammonium chloride Download PDFInfo
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- CN105948076B CN105948076B CN201610284400.9A CN201610284400A CN105948076B CN 105948076 B CN105948076 B CN 105948076B CN 201610284400 A CN201610284400 A CN 201610284400A CN 105948076 B CN105948076 B CN 105948076B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/16—Halides of ammonium
- C01C1/164—Ammonium chloride
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/24—Magnesium carbonates
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- 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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Abstract
The present invention relates to a kind of method that sequestration of carbon dioxide produces light magnesium carbonate co-production ammonium chloride.The present invention shines the waste material of sylvite as raw material using salt lake, adjust pH value of solution to absorb the carbon dioxide in industrial smoke by liquefied ammonia, the magnesium carbonate ammonium hydrate crystal of reaction generation is intermediate product, light magnesium carbonate is prepared by prepared calcium carbonate magnesium ammonium hydrate, is added in addition into reacted rich ammonium salt solution after chlorination magnesium raw material by separation of solid and liquid and combined producting ammonium chloride chemical fertilizer after drying.The carbon dioxide and ammonia of generation are sent back to reaction solution during prepared calcium carbonate magnesium ammonium hydrate to be reabsorbed, and are improved raw material availability, are reduced exhaust emissions；In salting-out process the halogen piece concentrate of generation is sent back to crystallization reactor as raw material absorbing carbon dioxide.The method energy-saving and environmental protection, workable of the present invention, it is easy to accomplish industrialization.
Description
Technical field
The present invention relates to a kind of mineral sequestration of carbon dioxide, and using the technique of its production light magnesium carbonate, belong to inorganic
Salt chemical engineering and field of fertilizer production.
Background technology
Pointed out, since 20 middle of century, fossil has been fired according to Intergovernmental Panel on Climate Change (IPCC) report
A large amount of use of material causes the atmospheric greenhouse gas content based on carbon dioxide constantly to rise, and this phenomenon becomes with global climate
Change has close relationship.In order to prevent caused by Global climate change environmental degradation to be further exacerbated by, it is necessary to from " source " and
" remittance " two aspect is started with and settles out the carbon dioxide content in air.
Due to fossil fuel in present or even following a very long time in leading position, coal, oil, gas are main energy
Source, in addition, regenerative resource remains unchanged costly in following decades price, can not be widely applied, this is resulted in
Carbon dioxide, which can not be fully reduced, in terms of source discharges into air.Therefore, in industrial smoke carbon dioxide carry out capture with
Seal (CCS, Carbon Capture and Storage) up for safekeeping to show one's talent, it has also become the focus paid close attention to and studied both at home and abroad.
CCS technologies include the CO produced to the energy and industrial activity2It is collected, transport and seals up for safekeeping.According to the mode of sealing up for safekeeping
It can be divided into again：Geological storage, ocean are sealed up for safekeeping seals up for safekeeping with mineral.Mineral, which are sealed up for safekeeping to belong to, compares safely and effectively mode, with other envelopes
The mode of depositing is compared, and particularly compared with geological storage, the mineral sequestration for realizing carbon dioxide with substantial amounts of magnesium-containing mineral has
Environment compatibility, while the magnesium carbonate of generation can realize that the permanent of carbon dioxide is sealed up for safekeeping and have economic benefit.
Mineral seal CO up for safekeeping2General principle be：CO2Chemically reacted, generated thermodynamically more with the ore of calcium-magnesium-containing
Stable solid carbonate mineral and other byproducts.Currently, the mode of mineral carbon sequestration mainly has three kinds：One is silicate mineral
Weathering absorbs CO2, pass through natural or artificial acceleration earth's surface silicate mineral and CO2Reaction, so that fixed CO2；Two be strange land (ex-
Situ) seal up for safekeeping, seal up for safekeeping the raw material such as ore and transport to CO2Emission source, by reaction unit by CO2Carbonation, is sealed up for safekeeping so as to reach
Effect；Three be that (in-situ) in situ is sealed up for safekeeping, by CO2It is directly injected into the rock of underground porous, makes CO2Directly react and turn with rock
It is changed into carbonate.
In Chen research, author realizes CO using Ba salt as working medium2Reaction precipitation, NaOH is used as one kind
Alkali is used for adjusting solution ph.Because Ba salt is poisonous and reserves are little, it is impossible to applied to plant-scale flue gas decarbonization；Tamura
Using Ca (OH)2Solution causes raw materials requirement amount huge as absorbent, while producing Ca (OH)2Process can also produce largely
CO2, can not substantially realize emission reduction.
In addition, carbon capture, using with Plugging Technology Applied (CCUS, Carbon Capture, Utilization and
Storage it is) the new development trend of CCS technologies, i.e., the carbon dioxide discharged in production process is purified, then put into
, can be with cycling and reutilization in new production process, rather than simply seal up for safekeeping.
The production of China's magnesium compound and demand occupy first place in the world.Up to hundreds of kinds of magnesium compound product, wherein most by
Magnesium carbonate hydrate series of products are concerned with, such as：Light magnesium carbonate is in fine chemistry industry, refractory material, rubber industry, coating work
The numerous areas such as industry, medicine, food, light industry enamel, ceramics have important application.Current China's magnesium carbonate hydrate and oxygen
The production for changing magnesium relies primarily on magnesite calcination, this method high energy consumption, and product is generally low grade products.Developed country such as U.S.
State, Japan, Holland etc. uses extra large making from brine for magnesium carbonate hydrate, but because technique directly decomposes MgCl2·6H2O is produced
HCl, equipment corrosion is serious.In addition, there are the research that magnesia is prepared by intermediate of magnesium carbonate trihydrate, preparation temperature in China at present
High and power consumption height.
The content of the invention
Industrial smoke is sealed up for safekeeping (such as with magnesium chloride it is an object of the invention to overcome the deficiencies of the prior art and provide one kind：Water
Mud factory flue gas, coal steam-electric plant smoke etc.) in carbon dioxide, and for the method for preparing light magnesium carbonate co-production ammonium chloride.This
Inventive method is with low cost, non-environmental-pollution there is provided method strong operability, it is easy to accomplish industrialization.
Technical scheme
China's bittern magnesium resource enriches, and exists in seawater, salt lake saline containing substantial amounts of with chloride and sulphate form
Magnesium.Qinghai Lake positioned at China Caidamu Basin south can be provided contains magnesium salts more than 2,000,000,000 tons, is good carbon dioxide
Mineral seal raw material up for safekeeping.For raw material, solution is adjusted by liquefied ammonia with magnesium chloride (can also be the waste material that sylvite is shone in salt lake) by the present invention
PH is to absorb the carbon dioxide in industrial smoke, and the magnesium carbonate ammonium hydrate crystal of reaction generation is intermediate product, by refined
Magnesium carbon ammonium hydrate prepares light magnesium carbonate, is added in addition into the rich ammonium salt solution of reactive crystallization after magnesium chloride by separation of solid and liquid
With combined producting ammonium chloride chemical fertilizer after drying.The carbon dioxide and ammonia of generation are sent back to during prepared calcium carbonate magnesium ammonium hydrate
Reaction solution is reabsorbed, and is improved raw material availability, is reduced exhaust emissions；By the halogen piece concentrate of generation in salting-out process
Crystallization reactor is sent back to as raw material absorbing carbon dioxide.
The mechanism that carbon dioxide, liquefied ammonia and halogen piece react in the solution is：
MgCl2·4H2O+2CO2+4NH3+2H2O→(NH4)2Mg(CO3)2·4H2O↓+2NH4Cl
This reaction generation magnesium carbonate ammonium crystal of hydrate, accessory substance is ammonium chloride.Magnesium carbonate ammonium hydrate is by being refining to obtain
To light magnesium carbonate crude product；Filtrated stock is used to prepare ammonium chloride product.
Magnesium carbonate ammonium hydrate, which passes through, is refining to obtain light magnesium carbonate crude product, then by washing, being dried to obtain lightweight carbonic acid
Magnesium products：
2(NH4)2Mg(CO3)2·4H2O→MgCO3·Mg(OH)2·4H2O+4NH3↑+3CO2↑+5H2O
It is to obtain chloride solid by adding to crystallize through oversalting after halogen piece that filtrated stock, which is used to prepare ammonium chloride product,
Realize：
MgCl2·4H2O(s)+2NH4Cl(aq)→MgCl2(aq)+2NH4Cl(s)+4H2O
This reaction makes ammonium chloride salting-out crystallization using the increase of Chlorine in Solution magnesium density, and the halogen piece concentrate after crystallization is returned
Return and be used as the raw material for preparing magnesium carbon ammonium hydrate.Compared with obtaining chloride solid by evaporative crystallization in the past, so not only save
It, can be conducive to integrating production procedure, while the influence to environment can be reduced, and produce obvious economic benefit.
Detailed technology scheme is as follows：
A kind of method that sequestration of carbon dioxide produces light magnesium carbonate co-production ammonium chloride, comprises the following steps：
(1) chlorination magnesium raw material is made to 3~6mol/L magnesium chloride solution, and together with 1~4mol/L ammonium chloride solutions
It is added in crystallization reactor, is well mixed as absorbent solution, is adjusted with liquefied ammonia behind pH8~10, industrial smoke is passed into this
In solution, reacted at 25~99 DEG C, obtain slurries I, slurries I are filtered, obtain mother liquor and magnesium carbonate ammonium hydrate；
(2) 10~30wt% mother liquor is passed through another crystallization reactor, concentrated hydrochloric acid is added dropwise and adjusts pH to 6~8, is cooled to
Temperature carries out filtering and divided for after 10~50 DEG C, addition magnesium chloride is crystallized into crystallization reactor, after stirring 5~60 minutes
From halogen piece concentrate and ammonium chloride crude product is obtained, halogen piece concentrate is sent back to and is used as raw material in step 1, ammonium chloride crude product is carried out
Dry, obtain ammonium chloride product；The crystallization reactor that remaining mother liquor I is sent back in step 1；
(3) the magnesium carbonate ammonium hydrate that step (1) is obtained is refined, obtains slurries II, carbon dioxide and ammonia, will
Carbon dioxide and ammonia, which are sent back in step (1), is used as raw material, slurries II is filtered, gained solid is magnesium carbonate hydrate, will
Magnesium carbonate hydrate is washed, dried, and produces light magnesium carbonate.The purity of light magnesium carbonate product is more than 98%, is shaped as
Bar-shaped or spherical and surface is in petal-shaped, and the particle diameter of spherical particle is 10~50 μm.
In above-mentioned technique, it is useless produced by sylvite that the chlorination magnesium raw material is that magnesium chloride, magnesium chloride hydrate or salt lake are shone
In material, the waste material produced by salt lake solarization sylvite, content of magnesium chloride is more than 46%.
In step (1), the industrial smoke is power plant by the gas or cement plant, boiler obtained by desulphurization denitration after-purification
Gas produced by room combustion of fossil fuels, wherein carbon dioxide volumn concentration are 12~28%.
In step (1), the volume ratio of the ammonium chloride solution and magnesium chloride solution is 6~2：1.
In step (2), when into crystallization reactor, addition magnesium chloride is crystallized, the magnesium chloride and crystallization reaction added
The mass ratio of solution is 0.6 in device：1~1：1.
In step (2), the temperature that ammonium chloride crude product is dried is 80-150 DEG C, and the time is 0.5-1h.
In step (3), the purification operations refer to mix in magnesium carbonate ammonium hydrate and water, are warming up to 50~99
DEG C, stir 20~80 minutes, the mass ratio of magnesium carbonate ammonium hydrate and water is 1：3~1：10.
In step (3), the temperature that magnesium carbonate hydrate is dried is 110-180 DEG C, and the time is 0.5-4h.
It is contemplated that " treatment of wastes with processes of wastes against one another ", is to shine the waste material halogen piece of sylvite as the titanium dioxide in raw material absorption flue gas using salt lake
Carbon, prepares the chlorine that magnesium carbon ammonium hydrate intermediate further produces the light magnesium carbonate product co-production high-quality with economic value
Change ammonium fertilizer.This process is good in economic efficiency, non-environmental-pollution；The method strong operability of offer, it is easily achieved industrialization.This
Invention advantage and positive role are：
(1) carbon dioxide in flue gas is absorbed, generation thermodynamically more stable carbonate, so as to realize two
The permanent of carbonoxide is sealed up for safekeeping.Due to the risk without leakage, it is not necessary to which great amount of investment carries out long term monitoring；Reduce flue gas direct
Discharge into air；It can suit measures to local conditions to realize sealing up for safekeeping on the spot for emission source carbon dioxide, with very wide application prospect.
(2) carbon dioxide is absorbed using halogen piece, is effectively utilized salt lake and shines produce during sylvite a large amount of useless
Expect (halogen piece), raw material very abundant and with low cost；The problem of current salt lake bittern magnesium resource is utilized is solved, locality is improved
Ecological environment.
(3) gained magnesium carbonate hydrate is easy to conversion decomposition, saves the energy, improves raw material availability.
(4) the light magnesium carbonate purity obtained by is more than 98%, is shaped as bar-shaped or spherical and surface in petal-shaped, spherical
The particle diameter of grain is 10~50 μm, can be as coating, refractory material etc., with good economic use value so that the present invention
With commercial applications potentiality.
(5) method that the halogen piece salting-out crystallization used produces ammonium chloride chemical fertilizer, reclaims the consumption of ammonium chloride Process Energy low.
The obtained fertile purity of ammonium is high, with good economic benefit.
Brief description of the drawings
Fig. 1 is the process chart of the inventive method.
Embodiment
The present invention is explained with accompanying drawing with reference to embodiments.In following embodiments, in order to save raw material, with
Useless to control useless, chlorination magnesium raw material used is that the content of magnesium chloride in the waste material produced by salt lake solarization sylvite, waste material is 46%.
The process chart of the present invention is referring to Fig. 1.
Embodiment 1
(1) prepare ammonium chloride solution 1500ml, ammonium chloride concentration is 3mol/L, using salt lake shine sylvite produced by waste material as
Raw material prepares the magnesium chloride solution that concentration is 6mol/L, two kinds of solution is added well mixed molten as absorbing in crystallization reactor
The volume ratio of liquid, ammonium chloride solution and magnesium chloride solution is 5：1, pH value of solution is adjusted to 9.1 with liquefied ammonia, by carbon dioxide volume integral
Number is passed through absorbent solution for the flue gas of 13% certain cement plant discharge, reacts and is starched in the case where reaction temperature is 53.2 DEG C for 6 hours
Liquid I；
(2) progress of slurries I that step 1 is obtained is filtrated to get mother liquor I and magnesium carbonate ammonium hydrate, magnesium carbonate ammonium hydrate
Purity is 95%, and the concentration of magnesium ion is 0.004mol/L in mother liquor I, and the concentration of ammonium ion is 3.2mol/L；50ml is female
Liquid I is passed through another crystallization reactor, concentrated hydrochloric acid (HCl contents are more than 25wt%) adjustment pH is added dropwise to 7.0, it is 25 to be cooled to temperature
After DEG C, the waste material 50g added into crystallization reactor produced by sylvite is shone in salt lake is crystallized, and after stirring 10 minutes, is carried out
Filter obtains halogen piece concentrate and ammonium chloride crude product, and the crystallization reactor that halogen piece concentrate is sent back in step 1 is used as raw material, halogen piece
The magnesium ion concentration of concentrate be 2.5mol/L, ammonium chloride crude product is dried, ammonium chloride 6.7g is obtained, be shaped as it is spherical,
Particle diameter is 50~80 μm；The crystallization reactor that remaining mother liquor I is sent back in step 1；
(3) step 2 gained magnesium carbonate ammonium hydrate is put in refining kettle, the deionized water of quality such as pours into, in temperature
To be stirred 30 minutes at 50 DEG C, slurries II, carbon dioxide and ammonia are obtained；The knot that carbon dioxide and ammonia are sent back in step 1
Brilliant reactor is used as raw material, and slurries II are carried out to be filtrated to get refined soln and magnesium carbonate hydrate, magnesium carbonate hydrate is used
Deionized water is washed twice, and is dried 1 hour in the case where temperature is 110 DEG C, is obtained light magnesium carbonate 202.6g, purity is 98.8%,
Be shaped as it is spherical, particle diameter be 20~40 μm；Sending refined soln back to refining kettle is used for refined circulate.
The carbon dioxide total absorptivity of the present embodiment is 95%, and the yield of light magnesium carbonate is 99.2%.
Embodiment 2
(1) prepare ammonium chloride solution 1500ml, ammonium chloride concentration is 3mol/L, using salt lake shine sylvite produced by waste material as
Raw material prepares the magnesium chloride solution that concentration is 6mol/L, two kinds of solution is added well mixed molten as absorbing in crystallization reactor
The volume ratio of liquid, ammonium chloride solution and magnesium chloride solution is 5：1, pH value of solution is adjusted to 9.8 with liquefied ammonia, by carbon dioxide volume integral
Number is passed through absorbent solution for the flue gas of 15% cement plant discharge, and in the case where reaction temperature is 47.6 DEG C, reaction obtains slurries in 15 hours
Ⅰ；
(2) progress of slurries I that step 1 is obtained is filtrated to get mother liquor I and magnesium carbonate ammonium hydrate, magnesium carbonate ammonium hydrate
Purity is 96%, and the concentration of magnesium ion is 0.002mol/L in mother liquor I, and the concentration of ammonium ion is 3.8mol/L；50ml is female
Liquid I is passed through another crystallization reactor, concentrated hydrochloric acid (HCl contents are more than 25wt%) adjustment pH is added dropwise to 6.0, it is 28 to be cooled to temperature
After DEG C, the waste material 40g added into crystallization reactor produced by sylvite is shone in salt lake is crystallized, and after stirring 5 minutes, is filtered
Halogen piece concentrate and ammonium chloride crude product are obtained, the crystallization reactor that halogen piece concentrate is sent back in step 1 is used as raw material, halogen piece is dense
The magnesium ion concentration of contracting liquid is 2.1mol/L, and ammonium chloride crude product is dried, ammonium chloride 5g is obtained, spherical, particle diameter is shaped as
For 50~80 μm；The crystallization reactor that remaining mother liquor I is sent back in step 1；
(3) step 2 gained magnesium carbonate ammonium hydrate is put in refining kettle, the deionized water of quality such as pours into, in temperature
To be stirred 30 minutes at 70 DEG C, slurries II, carbon dioxide and ammonia are obtained；The knot that carbon dioxide and ammonia are sent back in step 1
Brilliant reactor is used as raw material, and slurries II are carried out to be filtrated to get refined soln and magnesium carbonate hydrate, magnesium carbonate hydrate is used
Deionized water is washed twice, and is dried 1 hour in the case where temperature is 110 DEG C, is obtained light magnesium carbonate 440.7g, purity is 98%, shape
Shape is spherical, and particle diameter is 20~40 μm；Sending refined soln back to refining kettle is used for refined circulate.
The carbon dioxide total absorptivity of the present embodiment is 96%, and the yield of light magnesium carbonate is 99.5%.
Embodiment 3
(1) prepare ammonium chloride solution 6000ml, ammonium chloride concentration is 2mol/L, using salt lake shine sylvite produced by waste material as
Raw material prepares the magnesium chloride solution that concentration is 6mol/L, two kinds of solution is added well mixed molten as absorbing in crystallization reactor
The volume ratio of liquid, ammonium chloride solution and magnesium chloride solution is 3：1, pH value of solution is adjusted to 9.3 with liquefied ammonia, by carbon dioxide volume integral
Number is passed through absorbent solution for the flue gas of 15% cement plant discharge, and in the case where reaction temperature is 25 DEG C, reaction obtains slurries I in 20 hours；
(2) progress of slurries I that step 1 is obtained is filtrated to get mother liquor I and magnesium carbonate ammonium hydrate, magnesium carbonate ammonium hydrate
Purity is 96.7%, and the concentration of magnesium ion is 0.008mol/L in mother liquor I, and the concentration of ammonium ion is 7.1mol/L；By 100ml
Mother liquor I is passed through another crystallization reactor, concentrated hydrochloric acid (HCl contents are more than 25wt%) adjustment pH is added dropwise to 7.5, being cooled to temperature is
After 25 DEG C, the waste material 80g added into crystallization reactor produced by sylvite is shone in salt lake is crystallized, after stirring 15 minutes, is carried out
Halogen piece concentrate and ammonium chloride crude product are filtrated to get, the crystallization reactor that halogen piece concentrate is sent back in step 1 is used as raw material, halogen
The magnesium ion concentration of piece concentrate is 2.3mol/L, and ammonium chloride crude product is dried, ammonium chloride 35.6g is obtained, is shaped as ball
Shape, particle diameter is 60~80 μm；The crystallization reactor that remaining mother liquor I is sent back in step 1；
(3) step 2 gained magnesium carbonate ammonium hydrate is put in refining kettle, is passed through air, the deionization of quality such as pour into
Water, stirs 50 minutes in the case where temperature is 50 DEG C, obtains slurries II, carbon dioxide and ammonia；Send carbon dioxide and ammonia back to step
Crystallization reactor in rapid 1 is used as raw material, slurries II is carried out to be filtrated to get refined soln and magnesium carbonate hydrate, by magnesium carbonate
Hydrate is washed with deionized twice, is dried 1 hour in the case where temperature is 110 DEG C, obtains light magnesium carbonate 583.7g, purity is
98.5%, be shaped as it is spherical, particle diameter be 20~40 μm；Sending refined soln back to refining kettle is used for refined circulate.
The carbon dioxide total absorptivity of the present embodiment is 90%, and the yield of light magnesium carbonate is 99.0%.
Claims (7)
1. a kind of method that sequestration of carbon dioxide produces light magnesium carbonate co-production ammonium chloride, it is characterised in that including following step
Suddenly：
(1) chlorination magnesium raw material is made to 3~6mol/L magnesium chloride solution, and added together with 1~4mol/L ammonium chloride solutions
Into crystallization reactor, it is well mixed as absorbent solution, is adjusted with liquefied ammonia behind pH8~10, industrial smoke is passed into the solution
In, reacted at 25~99 DEG C, obtain slurries I, slurries I are filtered, obtain mother liquor I and magnesium carbonate ammonium hydrate；
(2) 10~30wt% mother liquor I is passed through another crystallization reactor, concentrated hydrochloric acid is added dropwise and adjusts pH to 6~8, temperature is cooled to
Spend for after 10~50 DEG C, into crystallization reactor, addition chlorination magnesium raw material is crystallized, and after stirring 5~60 minutes, is filtered
Halogen piece concentrate and ammonium chloride crude product are obtained, halogen piece concentrate is sent back in step (1) and is used as raw material, ammonium chloride crude product is carried out
Dry, obtain ammonium chloride product；The crystallization reactor that remaining mother liquor I is sent back in step (1)；
(3) the magnesium carbonate ammonium hydrate that step (1) is obtained is refined, slurries II, carbon dioxide and ammonia is obtained, by dioxy
Change carbon and ammonia is sent back in step (1) and is used as raw material, slurries II are filtered, gained solid is magnesium carbonate hydrate, by carbonic acid
Magnesium hydrate is washed, dried, and produces light magnesium carbonate；
In above-mentioned technique, the chlorination magnesium raw material is the waste material produced by magnesium chloride, magnesium chloride hydrate or salt lake solarization sylvite.
2. the method that sequestration of carbon dioxide as claimed in claim 1 produces light magnesium carbonate co-production ammonium chloride, its feature exists
In in step (1), the industrial smoke is power plant by the gas obtained by desulphurization denitration after-purification or cement plant, boiler room combustion
Gas produced by fossil fuel fired.
3. the method that sequestration of carbon dioxide as claimed in claim 1 produces light magnesium carbonate co-production ammonium chloride, its feature exists
In in step (1), the volume ratio of the ammonium chloride solution and magnesium chloride solution is 6~2：1.
4. the method that sequestration of carbon dioxide as claimed in claim 1 produces light magnesium carbonate co-production ammonium chloride, its feature exists
In in step (2), when into crystallization reactor, addition magnesium chloride is crystallized, in the magnesium chloride and crystallization reactor that are added
The mass ratio of solution is 0.6：1~1：1.
5. the method that sequestration of carbon dioxide as claimed in claim 1 produces light magnesium carbonate co-production ammonium chloride, its feature exists
In in step (2), the temperature that ammonium chloride crude product is dried is 80-150 DEG C, and the time is 0.5-1h.
6. the method that sequestration of carbon dioxide as claimed in claim 1 produces light magnesium carbonate co-production ammonium chloride, its feature exists
In in step (3), the purification operations refer to mix in magnesium carbonate ammonium hydrate and water, are warming up to 50~99 DEG C, stirring
20~80 minutes, the mass ratio of magnesium carbonate ammonium hydrate and water was 1：3~1：10.
7. the method that the sequestration of carbon dioxide as described in any one of claim 1 to 6 produces light magnesium carbonate co-production ammonium chloride,
Characterized in that, in step (3), the temperature that magnesium carbonate hydrate is dried is 110-180 DEG C, and the time is 0.5-4h.
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| CN109205644A (en) * | 2018-11-28 | 2019-01-15 | 南京浦世环境科技发展有限公司 | A method of recycling ammonium chloride from magnesium carbonate waste liquid |
| CN109364715A (en) * | 2018-11-28 | 2019-02-22 | 南京浦世环境科技发展有限公司 | A kind of device and method for sealing carbon dioxide in flue gas up for safekeeping using rich magnesium mineral |
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