CN109133122A - A method of nanometer magnesia powder is prepared by raw material of desulfurization wastewater - Google Patents
A method of nanometer magnesia powder is prepared by raw material of desulfurization wastewater Download PDFInfo
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- CN109133122A CN109133122A CN201811274394.4A CN201811274394A CN109133122A CN 109133122 A CN109133122 A CN 109133122A CN 201811274394 A CN201811274394 A CN 201811274394A CN 109133122 A CN109133122 A CN 109133122A
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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
- C01F5/02—Magnesia
- C01F5/06—Magnesia by thermal decomposition of magnesium compounds
- C01F5/08—Magnesia by thermal decomposition of magnesium compounds by calcining magnesium hydroxide
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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
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
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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
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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Abstract
The present invention relates to a kind of methods for preparing nanometer magnesia powder as raw material using desulfurization wastewater, its by homogeneous, heavy-metal ion removal, add sodium sulphate and prepare gypsum by-product, add sodium carbonate and prepare lime stone byproduct, add sodium hydroxide and prepare magnesium hydroxide, then magnesium hydroxide is prepared into magnesium oxide product after calcining, finally carries out water process by nanofiltration and reverse osmosis unit and obtains the reflux water for meeting production requirement；Calcium ions and magnesium ions separation is prepared byproduct during softening desulfurization wastewater by the present invention, realizes the comprehensive utilization of resource, meets the theory of energy-saving and emission-reduction.
Description
Technical field
The invention belongs to desulfurization wastewater processing technology fields, and in particular to a kind of to prepare nano oxygen by raw material of desulfurization wastewater
Change the method for magnesium powder body.
Background technique
Wet Limestone gypsum method flue gas desulfurization is the commonly used coal-fired flue gas desulfurization technology in China, which accounts for China
90% or more of coal fired power plant installed capacity.It is useless that wet method fume desulfurizing system can generate a certain amount of desulfurization in actual operation
Water, the pH value of desulfurization wastewater contain a large amount of gypsum, flying dust and sulfate suspension generally between 4~6 in desulfurization wastewater
Grain, wherein chlorine ion concentration may be up to 20000mg/L, and the cation in desulfurization wastewater is mainly calcium and magnesium ion and an a small amount of huge sum of money
Belong to ion.Direct emission can bring secondary pollution to environment.Chemical precipitation-coagulation clarification technique is widely used both at home and abroad at present
Desulfurization wastewater is disposed, although suspended matter and content of beary metal in water can be effectively reduced in the technique, after processing
Waste water still contain a large amount of calcium and magnesium ion, wherein the concentration of magnesium ion is even as high as mg/L up to ten thousand, have strong corrosive and easily
The features such as fouling, waste water are unable to reach reuse standard.The terminal processing techniques of desulfurization wastewater carry out after decrement is mainly concentrated
Evaporation process, the soluble solid in desulfurization wastewater are trapped in concentration raffinate, are finally precipitated with crystal form.According to heating
The difference of form can be divided into multistage flash distillation, multiple-effect evaporation and mechanical vapor recompression technology and flue gas evaporation technique etc..Cigarette
Road gas evaporation technique is the flue between the air preheater and electric precipitator for spraying into coal-fired power station boiler after being atomized desulfurization wastewater,
Or enter in bypass vaporising device together from a part of hot fume and desulfurization wastewater is introduced into before air preheater, utilize flue gas heat
Make waste water evaporating completely, Pollutants in Wastewater is converted into the solids such as crystal or salt, is removed with the flying dust in flue gas by electricity
Dirt device is collected, to realize the zero-emission of waste water.The investment of flue evaporation technique and operating cost are lower, occupied area pole
It is small, however, the technology is the acid waste water for directly spraying into high salinity into flue, it be easy to cause the corrosion or product of downstream flue
Ash, and flyash quality is caused to decline, influence the comprehensive utilization of flyash.Evaporative crystallization method can recycle water resource and crystallization
Salt, but its investment is high with operating cost and takes up an area larger.Meanwhile if the crystal salt of recycling is sodium sulphate and chlorination
The mixed salt of sodium composition, is worth lower.In addition, generally being needed in order to ensure crystallizing evaporator operates normally and guarantee crystal salt quality
Waste water is strictly pre-processed.In short, desulfurization wastewater processing technique also needs development investment operating cost lower and high attached
The technology of value added resource utilization.
Nanoscale magnesium has apparent small-size effect, skin effect, quantum size effect and macroscopical tunnel-effect,
Modified processing, soilless sticking phenomenon, optics, catalysis, magnetism, mechanics, in terms of there are many exceptional functions and important
Application value, prospect are boundless.Contain a large amount of magnesium ion in desulfurization wastewater, may be used as the raw material for preparing magnesia.
But it in existing desulfurization wastewater processing technique, typically lays stress in the softening of desulfurization wastewater, isolated pair
Product is existed in the form of mixing pug, is then uniformly processed, cannot obtain the very high magnesium oxide product of purity.Stone
Cream is a kind of application and its extensive chemical substance, that is, can be used as industrial materials and construction material, it can also be used to cement retarder,
Gypsum building products, modelling, medical food additive, gas washing in SA production, filler, paint filler etc.；Gypsum and its system
The microcellular structure and thermal dehydration of product are allowed to have excellent sound insulation, heat-insulated and fire protecting performance.And traditional desulfurization wastewater processing
It is often laid stress in technology in waste water softening, obtained byproduct is often carried out at concentration in the form of mixing pug
Reason, can not obtain the very high gypsum product of purity.
Summary of the invention
The present invention specifically addresses above-mentioned problem, propose that one kind prepares nanoscale oxygen by raw material substep softening of desulfurization wastewater
The method for changing magnesium powder body, byproduct, the especially preparation of salt magnesia are carried out during softening desulfurization wastewater, is realized
The synthesization of resource utilizes.
The present invention is in order to solve the above technical problems, used technical solution is as follows:
The present invention includes the following steps:
(1) by desulfurization wastewater in homogeneous pond abundant homogeneous, precipitate indissoluble object completely, obtain level-one supernatant；Sampling
Level-one supernatant water quality is chemically examined, each ion concentration is detected；
(2) level-one supernatant is imported into precipitation reaction pond, adds generate precipitating after recapturing agent thereto；It is sufficiently aged laggard
Row is separated by solid-liquid separation, and obtains secondary supernatant；The reaction occurred during this is as follows:
M2++S2-=MS ↓
Wherein: M2+For heavy metal ion；
(3) secondary supernatant is imported into reaction tank 1, if secondary supernatant calcium ion concentration is higher than 1000mg/L, added
PH is controlled 7.0, then adds solid sodium sulfate, dosage are as follows: 3 (x-1000) mg/L by sodium hydroxide solution；Then it adds
Calcium sulfate, dosage are the 1% of solid sodium sulfate；The x is calcium ion concentration, unit mg/L；If in secondary supernatant calcium from
When sub- concentration is lower than 1000mg/L, pH is controlled after 7.0 with sodium hydroxide solution, solid-liquid point is carried out by tubular type film device
From obtaining mud mixture and three-level supernatant；The reaction occurred during this is as follows:
Ca2++SO4 2-=CaSO4↓
Mg2++2OH-=Mg (OH)2↓
(4) three-level supernatant is imported in reaction tank 2, adds sodium carbonate liquor, dosage is according to following ratio: carbonate
The molar ratio of ion and calcium ion is 1.1-1.3；Precipitation of calcium carbonate is generated, is separated by solid-liquid separation after fully reacting with filtering ponds 1,
Obtain level Four supernatant and calcium carbonate solid product；The reaction occurred during this is as follows:
Ca2++CO3 2-=CaCO3↓
Mg2++CO3 2-=MgCO3↓
(5) level Four supernatant is imported in reaction tank 3, adds sodium hydroxide solution, generate magnesium hydrate precipitate；Use tubular type
Film device is separated by solid-liquid separation, and Pyatyi supernatant is obtained；The production of high purity magnesium hydrate solid is obtained after precipitating filtering means dehydration is dry
Product；The reaction occurred during this is as follows:
Mg2++2OH-=Mg (OH)2↓
(6) magnesium hydroxide solid product is calcined, and obtains nano magnesia after being ground with nano-level grinder；This mistake
The reaction occurred in journey is as follows:
(7) by Pyatyi supernatant after nanofiltration device and reverse osmosis unit, purity fresh water up to standard is obtained, can be used as life
Fisheries water carries out reflux use.
As a further improvement of the present invention, the sodium hydroxide solution in the step (3) is the solution of concentration 15wt%；
Sodium sulphate, which is added, can make the calcium ion of high concentration with CaSO4·2H2The mode of O settles down, realizes the substep removal of calcium ion,
The dosage of sodium carbonate in subsequent process steps is reduced, economy is high；It adds a small amount of calcium sulfate and is to help precipitating generation.
It as a further improvement of the present invention, is CaSO after the mud mixture dehydration in the step (3)4·2H2O, wherein containing
A small amount of Mg (OH)2；Gypsum product is obtained after mud mixture is dehydrated, the water sloughed is passed through in homogeneous pond and continues to participate in
Circulation.
As a further improvement of the present invention, 30 DEG C of reaction temperature in the step (4), time 40min.
As a further improvement of the present invention, the liquid inlet volume of sodium hydroxide is 6mL/min, pH control in the step (5)
The blender revolving speed 600r/min in 11.0~11.5, reaction process, mixing time 30min, temperature 60 C are old after stirring
Change 60min, 60 DEG C of Aging Temperature.
As a further improvement of the present invention, PEG-6000 dispersing agent is also added in the step (5), additional amount is
2.5mL/100mL waste water.
As a further improvement of the present invention, 1600 DEG C of calcination temperature in the step (6), time 1.5h.
As a further improvement of the present invention, in the step (7) by nanofiltration device and the concentrated water of reverse osmosis unit into
Row evaporative crystallization obtains solid mixed salt and is comprehensively utilized.
Compared with prior art, the present invention having the following technical effect that
The present invention carries out the softening of desulfurization wastewater by the method for step-by-step processing, during softening, to by-products at different levels
Product are recycled, and the magnesia of high-purity, gypsum and lime stone has especially been prepared, and realize the comprehensive utilization of resource,
And treated that waste water quality is completely up to standard, can be used as industrial water and carries out reflux use.
Gypsum is a kind of application and its extensive chemical substance, that is, can be used as industrial materials and construction material, it can also be used to
Cement retarder, gypsum building products, modelling, medical food additive, gas washing in SA production, filler, paint filler etc.；
The microcellular structure and thermal dehydration of gypsum and its product are allowed to have excellent sound insulation, heat-insulated and fire protecting performance.And it is traditional de-
Often laid stress in sulphur wastewater processing technology in waste water softening, obtained byproduct often in the form of mixing pug into
Row centralized processing, can not obtain the very high gypsum product of purity.And in desulfurization wastewater, especially the desulfurization of calcium method obtains de-
There are a large amount of calcium ion in sulphur waste water, the present invention makes calcium ion and sulfate ion by adding metabisulfite solution in early period
Reaction generates calcium sulfate, then obtains calcium sulphate solid product, i.e. gypsum product by dehydration and drying.
Detailed description of the invention
Attached drawing 1 is process flow chart of the invention.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
As shown in Figure 1, the present invention includes the following steps:
(1) by desulfurization wastewater in homogeneous pond abundant homogeneous, precipitate indissoluble object completely, obtain level-one supernatant；Sampling
Level-one supernatant water quality is chemically examined, each ion concentration is detected；
(2) level-one supernatant is imported into precipitation reaction pond, adds generate precipitating after recapturing agent thereto；It is sufficiently aged laggard
Row is separated by solid-liquid separation, and obtains secondary supernatant；The reaction occurred during this is as follows:
M2++S2-=MS ↓
Wherein: M2+For heavy metal ion；
(3) secondary supernatant is imported into reaction tank 1, if secondary supernatant calcium ion concentration is higher than 1000mg/L, added
Concentration is 15wt% sodium hydroxide solution, and pH is controlled 7.0, then adds solid sodium sulfate, dosage are as follows: 3 (x-1000)
mg/L；Then calcium sulfate is added, dosage is the 1% of solid sodium sulfate；The x is calcium ion concentration, unit mg/L；If second level
When calcium ion concentration is lower than 1000mg/L in supernatant, pH is controlled after 7.0 with sodium hydroxide solution, passes through tubular type film device
It is separated by solid-liquid separation, obtains mud mixture and three-level supernatant；It is CaSO after mud mixture dehydration4·2H2O, wherein containing
There is a small amount of Mg (OH)2；Gypsum product is obtained after mud mixture is dehydrated, the water sloughed, which is passed through in homogeneous pond, to be continued to join
With circulation；
The reaction occurred during this is as follows:
Ca2++SO4 2-=CaSO4↓
Mg2++2OH-=Mg (OH)2↓
(4) three-level supernatant is imported in reaction tank 2, adds sodium carbonate liquor, dosage is according to following ratio: carbonate
The molar ratio of ion and calcium ion is 1.1-1.3；Generation precipitation of calcium carbonate, 30 DEG C of reaction temperature, time 40min；Fully reacting
It is separated by solid-liquid separation afterwards with filtering ponds 1, obtains level Four supernatant and calcium carbonate pug, after calcium carbonate pug is dehydrated
Calcium carbonate solid product is obtained, is back to use in the desulfurization workshop section of desulfurizing tower；The reaction occurred during this is as follows:
Ca2++CO3 2-=CaCO3↓
Mg2++CO3 2-=MgCO3↓
(5) level Four supernatant is imported in reaction tank 3, adds sodium hydroxide solution and PEG-6000 dispersing agent, generate hydrogen
Magnesium oxide precipitation；It is separated by solid-liquid separation with tubular type film device, obtains Pyatyi supernatant；It is obtained after precipitating filtering means dehydration is dry high-purity
Spend magnesium hydroxide solid product；To guarantee magnesium ion precipitating completely, dispersing agent additional amount is 2.5mL/100mL waste water, hydroxide
Sodium should be added slowly, and the liquid inlet volume of sodium hydroxide is 6mL/min, and pH control blender in 11.0~11.5, reaction process turns
Fast 600r/min, mixing time 30min, temperature 60 C are aged 60min after stirring, and 60 DEG C of Aging Temperature；
The reaction occurred during this is as follows:
Mg2++2OH-=Mg (OH)2↓
(6) calcining is dried in magnesium hydroxide solid product, and obtains nano magnesia after being ground with nano-level grinder；
1600 DEG C of calcination temperature, time 1.5h；The reaction occurred during this is as follows:
(7) it by Pyatyi supernatant after nanofiltration device and reverse osmosis unit, produces water side and obtains purity fresh water up to standard, it can
It carries out reflux as industrial water to use, concentrated water side, which is evaporated crystallization and obtains solid mixed salt, to be comprehensively utilized.
Embodiment 1:
Take certain factory desulfurization wastewater 100L behind laboratory, abundant homogeneous, result of laboratory test: calcium ion concentration 12073mg/L,
Magnesium ion concentration is 7342mg/L.Due to not detecting plurality of heavy metal ion, therefore waste water is passed directly into reaction tank.In reaction tank
3500g sodium sulphate is added, pH is controlled 7 with sodium hydroxide solution, reacted at room temperature 20min, be passed through tubular membrane by 50g calcium sulfate
Filtering.Obtained mud mixture, dehydration obtain calcium sulphate dihydrate, and the moisture of removing is back to homogeneous pond.Tubular membrane produces water,
It is passed through reaction tank 2, addition 700g sodium carbonate in pond, 30 DEG C of reaction temperature, reaction time 40min.It is passed through filtering after reaction
Pond 1, obtained mud mixture are exactly calcium carbonate underflow, reuse FGD.Supernatant is passed through reaction tank 3, slowly into reaction tank 3
15%NaOH solution is added, multiple inlets, the feed liquor of this example can be arranged according to reaction tank surface area in liquid inlet volume 6mL/min
Mouth is 3.Reaction time 45min, temperature 60 C, dispersing agent additional amount are 25L, and pH control is 11.0~11.5, reaction process
Middle blender revolving speed 600r/min, is aged 60min after stirring, and 60 DEG C of Aging Temperature；It will reaction with pumping pump after ageing
Substance squeezes into tubular type film device in pond 3, obtains magnesium hydroxide underflow after separation and produces water.Magnesium hydroxide underflow is dehydrated, is done
Magnesium hydroxide solid is obtained after dry, is then calcined, 1600 DEG C of calcination temperature, time 1.5h, and ground with nano-level grinder
After obtain nano magnesia；It produces water to be divided into concentrated water by nanofiltration device and produce water, nanofiltration produces water and enters reverse osmosis unit, reverse osmosis
The production water of device can carry out crystallization and evaporation with reuse, reverse osmosis concentrated water and nanofiltration concentrated water, obtain solid salt and comprehensively utilized.This
The purity of Nano-sized MgO by Precipitation is 94.71% in example.
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (8)
1. a kind of method for preparing nanometer magnesia powder as raw material using desulfurization wastewater, which comprises the steps of:
(1) by desulfurization wastewater in homogeneous pond abundant homogeneous, precipitate indissoluble object completely, obtain level-one supernatant；Sample examination
Level-one supernatant water quality, detects each ion concentration；
(2) level-one supernatant is imported into precipitation reaction pond, adds generate precipitating after recapturing agent thereto；Sufficiently consolidated after ageing
Liquid separation, obtains secondary supernatant；
(3) secondary supernatant is imported into reaction tank 1, if secondary supernatant calcium ion concentration is higher than 1000mg/L, adds hydrogen-oxygen
Change sodium solution, pH is controlled 7.0, then adds solid sodium sulfate, dosage are as follows: 3 (x-1000) mg/L；Then sulfuric acid is added
Calcium, dosage are the 1% of solid sodium sulfate；The x is calcium ion concentration, unit mg/L；If calcium ion is dense in secondary supernatant
When degree is lower than 1000mg/L, pH is controlled after 7.0 with sodium hydroxide solution, is separated by solid-liquid separation, is obtained by tubular type film device
To mud mixture and three-level supernatant；
(4) three-level supernatant is imported in reaction tank 2, adds sodium carbonate liquor, dosage is according to following ratio: carbanion
Molar ratio with calcium ion is 1.1-1.3；Precipitation of calcium carbonate is generated, is separated by solid-liquid separation, is obtained with filtering ponds 1 after fully reacting
Level Four supernatant and calcium carbonate underflow；
(5) level Four supernatant is imported in reaction tank 3, adds sodium hydroxide solution, generate magnesium hydrate precipitate；It is filled with tubular membrane
It sets and is separated by solid-liquid separation, obtain Pyatyi supernatant；High purity magnesium hydrate solid product is obtained after precipitating filtering means dehydration is dry；
(6) magnesium hydroxide solid product is calcined, and obtains nano magnesia after being ground with nano-level grinder；
(7) by Pyatyi supernatant after nanofiltration device and reverse osmosis unit, purity fresh water up to standard is obtained.
2. a kind of method for preparing nanometer magnesia powder as raw material using desulfurization wastewater according to claim 1, feature
It is, the sodium hydroxide solution in the step (3) is the solution of concentration 15wt%.
3. a kind of method for preparing nanometer magnesia powder as raw material using desulfurization wastewater according to claim 2, feature
It is, obtain calcium sulfate after mud mixture in the step (3) is dehydrated, the water sloughed, which is passed through in homogeneous pond, to be continued to join
With circulation.
4. a kind of method for preparing nanometer magnesia powder as raw material using desulfurization wastewater according to claim 1, feature
It is, 30 DEG C of reaction temperature in the step (4), time 40min.
5. a kind of method for preparing nanometer magnesia powder as raw material using desulfurization wastewater according to claim 1, feature
Be, sodium hydroxide dosage is according to following ratio in the step (5): liquid inlet volume 6mL/min, pH control 11.0~
11.5, blender revolving speed 600r/min, mixing time 30min, temperature 60 C are aged 60min after stirring in reaction process,
60 DEG C of Aging Temperature.
6. a kind of method for preparing nanometer magnesia powder as raw material using desulfurization wastewater according to claim 5, feature
It is, PEG-6000 dispersing agent is also added in the step (5), and additional amount is 2.5mL/100mL waste water.
7. a kind of method for preparing nanometer magnesia powder as raw material using desulfurization wastewater according to claim 1, feature
It is, 1600 DEG C of calcination temperature in the step (6), time 1.5h.
8. a kind of method for preparing nanometer magnesia powder as raw material using desulfurization wastewater according to claim 1, feature
It is, the concentrated water in the step (7) by nanofiltration device and reverse osmosis unit is evaporated crystallization and obtains the progress of solid mixed salt
Comprehensive utilization.
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| CN111762954A (en) * | 2020-07-09 | 2020-10-13 | 江苏肯创环境科技股份有限公司 | High-salt-content wastewater treatment method |
| CN115367902A (en) * | 2021-05-18 | 2022-11-22 | 国家能源投资集团有限责任公司 | High-salinity wastewater pretreatment method and application thereof |
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| CN107619137A (en) * | 2017-10-10 | 2018-01-23 | 华北电力大学（保定） | The apparatus and method of calcium and magnesium in a kind of carbonizatin method recovery desulfurization wastewater |
| CN107804862A (en) * | 2017-11-22 | 2018-03-16 | 广东华欣环保科技有限公司 | One kind method for extracting magnesium oxide from desulfurization wastewater caused by magnesium processes desulfurization |
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| CN115367902A (en) * | 2021-05-18 | 2022-11-22 | 国家能源投资集团有限责任公司 | High-salinity wastewater pretreatment method and application thereof |
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