CN113461034A - Method for producing sodium sulfite from desulfurized gypsum - Google Patents
Method for producing sodium sulfite from desulfurized gypsum Download PDFInfo
- Publication number
- CN113461034A CN113461034A CN202110889185.6A CN202110889185A CN113461034A CN 113461034 A CN113461034 A CN 113461034A CN 202110889185 A CN202110889185 A CN 202110889185A CN 113461034 A CN113461034 A CN 113461034A
- Authority
- CN
- China
- Prior art keywords
- calcium
- sodium sulfite
- desulfurized gypsum
- sulfite
- sodium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 title claims abstract description 118
- 235000010265 sodium sulphite Nutrition 0.000 title claims abstract description 57
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 45
- 239000010440 gypsum Substances 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 229910000020 calcium bicarbonate Inorganic materials 0.000 claims abstract description 29
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 claims abstract description 27
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 24
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 claims abstract description 16
- 235000010261 calcium sulphite Nutrition 0.000 claims abstract description 16
- 239000011734 sodium Substances 0.000 claims abstract description 13
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 11
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 11
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000011575 calcium Substances 0.000 claims abstract description 4
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 4
- 239000000706 filtrate Substances 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 16
- 230000009466 transformation Effects 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 7
- 238000002425 crystallisation Methods 0.000 claims description 6
- 230000008025 crystallization Effects 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 230000001131 transforming effect Effects 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 239000000292 calcium oxide Substances 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 7
- 239000003546 flue gas Substances 0.000 abstract description 7
- 238000006477 desulfuration reaction Methods 0.000 abstract description 5
- 230000023556 desulfurization Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 2
- 239000006227 byproduct Substances 0.000 abstract description 2
- 239000011593 sulfur Substances 0.000 abstract description 2
- 229910052717 sulfur Inorganic materials 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 235000010216 calcium carbonate Nutrition 0.000 abstract 3
- 229940001482 sodium sulfite Drugs 0.000 description 36
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 8
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical class [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 239000012065 filter cake Substances 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229940101006 anhydrous sodium sulfite Drugs 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- WMJRPJZQQSSDBU-UHFFFAOYSA-L disodium;sulfite;heptahydrate Chemical compound O.O.O.O.O.O.O.[Na+].[Na+].[O-]S([O-])=O WMJRPJZQQSSDBU-UHFFFAOYSA-L 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/14—Preparation of sulfites
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Treating Waste Gases (AREA)
Abstract
The method for producing sodium sulfite by using desulfurized gypsum is characterized by that it uses desulfurized gypsum as raw material, uses sodium-containing solution as conversion liquor to convert calcium sulfite in desulfurized gypsum into calcium hydrogen carbonate and at the same time produce by-product sodium sulfite so as to implement separation and recovery of calcium in desulfurized gypsum in the form of calcium hydrogen carbonate or calcium carbonate, and separate and recover sulfur in the form of sodium sulfite, and can change waste into valuables, and greatly reduce the environmental protection pressure of flue gas desulfurization.
Description
Technical Field
The invention belongs to the field of environmental protection and comprehensive utilization of resources, and particularly relates to a method for producing sodium sulfite by using desulfurized gypsum.
Background
The desulfurized gypsum is calcium sulfite gypsum obtained by spraying lime milk to absorb sulfur dioxide in flue gas in industrial enterprises burning coal or oil, and secondary pollution is caused because the calcium sulfite gypsum is unstable and releases sulfur dioxide when meeting acid. Therefore, the gypsum obtained by flue gas treatment usually needs blast oxidation to oxidize calcium sulfite into calcium sulfate, and then is filtered and dried, so that the flue gas desulfurization cost is greatly increased, and the obtained desulfurized gypsum contains a large amount of impurities such as smoke dust, coal ash and the like, is poor in phase, difficult to find out a market, and the desulfurized gypsum of many enterprises is accumulated like a mountain, so that serious potential safety hazards are brought to the surrounding environment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the method for producing the sodium sulfite by the desulfurized gypsum, which has the advantages of simple process, high comprehensive utilization rate, good economic benefit and convenient operation.
The invention relates to a method for producing sodium sulfite by using desulfurized gypsum, which takes desulfurized gypsum as a raw material, uses a sodium-containing solution as a transformation liquid, stirs and adds the desulfurized gypsum according to the theoretical amount of sodium sulfite converted from sodium in the transformation liquid being 1-2.5 times of the theoretical amount of sodium sulfite, and pressurizes and blows CO2Transforming calcium sulfite in the desulfurized gypsum to calcium bicarbonate, dissolving the calcium bicarbonate into the solution, transforming sodium in the transformed solution into sodium sulfite, and filtering to obtain primary filter residue and primary filtrate, wherein the primary filtrate is a solution containing sodium sulfite and calcium bicarbonate;
evaporating and concentrating the primary filtrate to crystallize calcium bicarbonate, and cooling, crystallizing and separating sodium sulfite;
or stirring and adding calcium oxide or calcium hydroxide according to the theoretical amount of 1-1.2 times of calcium carbonate converted from calcium bicarbonate in the primary filtrate to precipitate calcium in the form of calcium carbonate, filtering to obtain secondary filter residue and secondary filtrate, and evaporating and concentrating the secondary filtrate to crystallize sodium sulfite.
The invention relates to a method for producing sodium sulfite by using desulfurized gypsum, wherein the desulfurized gypsum is the desulfurized gypsum with unoxidized calcium sulfite content of more than or equal to 85 wt%.
The invention relates to a method for producing sodium sulfite by desulfurized gypsum, wherein the sodium-containing solution is Na containing at least one of sodium bicarbonate, sodium carbonate and sodium hydroxide+The ion concentration is 25-50 g/L.
The invention relates to a method for producing sulfurous acid by using desulfurized gypsumA method of sodium acid, said transformation being: introducing CO2And (3) blowing the calcium sulfite into the transformation liquid under pressure, stirring the calcium sulfite for 0.5 to 3.5 hours at the temperature of between 30 and 60 ℃ under the pressure of between 0.005 and 0.15MPa, and transforming the calcium sulfite into calcium bicarbonate.
According to the method for producing sodium sulfite by using desulfurized gypsum, primary filtrate is evaporated and concentrated, so that 50-80 wt% of calcium bicarbonate in the filtrate is crystallized and separated out; and (3) evaporating and concentrating the secondary filtrate, namely crystallizing and separating out 60-90 wt% of sodium sulfite in the secondary filtrate.
The invention relates to a method for producing sodium sulfite by desulfurized gypsum, wherein the cooling and crystallizing conditions of the sodium sulfite are as follows: cooling and crystallizing for 2-6 h at 0-10 ℃.
According to the method for producing sodium sulfite by using desulfurized gypsum, the yield of sodium sulfite is more than or equal to 95.6% and the purity of the obtained sodium sulfite product is more than or equal to 97.5% in the conversion process of desulfurized gypsum.
The invention relates to a method for producing sodium sulfite by desulfurized gypsum, which has the following basic principle:
CaSO3·2H2O+2NaHCO3＝Ca(HCO3)2+Na2SO3+2H2O (1)
CaSO3·2H2O+CO2+Na2CO3＝Ca(HCO3)2+Na2SO3+2H2O (2)
Ca(HCO3)2+CaO＝2CaCO3↓+H2O (3)
CaCO3+SO2+2H2O＝CaSO3·2H2O↓+CO2↑ (5)
CaO+SO2+2H2O＝CaSO3·2H2O↓ (6)
compared with the prior art, the invention has the following advantages and effects:
the invention skillfully uses the sodium-containing solution as the transformation liquid, so that the calcium sulfite in the desulfurized gypsum is transformed into the calcium bicarbonate, and the sodium sulfite is a byproduct, thereby realizing the separation and recovery of the calcium in the desulfurized gypsum in the form of the calcium bicarbonate or the calcium carbonate, and the separation and recovery of the sulfur in the form of the sodium sulfite, changing waste into valuable, greatly reducing the subsequent environmental protection pressure of flue gas desulfurization, and having the advantages of simple process, high comprehensive utilization rate, good economic benefit, convenient operation and the like, and being suitable for the industrial application of the resource treatment of the desulfurized gypsum.
Detailed Description
The invention will now be further described with reference to the following examples, which are intended to illustrate the invention but not to limit it further.
Example 1
Taking CaSO3·2H2150g of coal-fired flue gas desulfurization gypsum with the O content of 89.7 percent, adding 500mL of saturated sodium bicarbonate solution with stirring, and blowing CO2Maintaining the system pressure at 0.01MPa, stirring and transforming at 35 ℃ for 3.5h to convert calcium sulfite in the system into calcium bicarbonate, filtering to obtain transformed liquid (primary filtrate) and transformed slag (primary filter residue), wherein the conversion rate of converting sodium bicarbonate into calcium bicarbonate in the transformation process reaches 97.8%, the obtained transformed slag is returned to be continuously used as a transformation raw material, stirring and adding calcium hydroxide into the transformed liquid according to the theoretical amount of the calcium carbonate converted from the calcium bicarbonate in the transformed liquid which is 1.02 times of the theoretical amount of the calcium carbonate, adjusting the pH value to 9.3, filtering to obtain a calcium carbonate filter cake (secondary filter residue) and a sodium sulfite solution (secondary filtrate), washing and drying the obtained filter cake, wherein the calcium carbonate content reaches 99.2%, the sodium sulfite solution is evaporated and crystallized to obtain a high-quality industrial sodium sulfite product with the purity of 97.8%, the crystallization rate of the sodium sulfite is 87.5%, the obtained crystallization mother liquor is returned to prepare the transformation liquor, and after the solution is recycled for 5 times, the average yield of the sodium sulfite is 95.62%.
Example 2
500mL of 2mol/L NaOH solution is taken and stirred and added with CaSO3·2H2200g of fuel oil flue gas desulfurization gypsum with the O content of 93.7 percent, and 0.05MPa of CO is blown in under pressure2Adjusting pH to 6.7, stirring at 55 deg.C for 2.5h to make the sulfurous acid thereinCalcium carbonate is converted into calcium bicarbonate, a conversion liquid (primary filtrate) and a conversion slag (primary filter residue) are obtained by filtration, the conversion rate of sodium bicarbonate into calcium bicarbonate in the conversion process reaches 98.3 percent, the obtained conversion slag is returned to be continuously used as a conversion raw material, the liquid after conversion is evaporated and concentrated to 150mL, the liquid is cooled to room temperature and filtered to obtain a calcium bicarbonate filter cake and a sodium sulfite solution, the obtained filter cake is washed by a saturated calcium bicarbonate solution and dried to obtain calcium bicarbonate powder with the purity of 99.2 percent, the weight of the calcium bicarbonate powder is 47.8g, the obtained sodium sulfite solution is cooled to 0 ℃, sodium sulfite seed crystals are added, the solution is cooled and crystallized for 3.5 hours, sodium sulfite heptahydrate crystals and a crystallization mother liquid thereof are obtained by filtration, the crystallization rate of the sodium sulfite is 67.8 percent, the obtained crystallization mother liquid is returned to prepare the conversion liquid, the average yield of the sodium sulfite is 96.13 percent after the solution is recycled for 10 times, the obtained sodium sulfite crystals are added into a proper amount of water, so that the sodium sulfite is converted into anhydrous sodium sulfite, and high-quality industrial sodium sulfite product with the purity of 98.5 percent is obtained by filtering while the sodium sulfite is hot.
Claims (7)
1. A method for producing sodium sulfite by using desulfurized gypsum is characterized by comprising the following steps: taking the desulfurized gypsum as a raw material, using a sodium-containing solution as a transformation liquid, converting sodium in the transformation liquid into sodium sulfite with the amount being 1-2.5 times of the theoretical amount, stirring, adding the desulfurized gypsum, and pressurizing and blowing CO2Transforming calcium sulfite in the desulfurized gypsum to calcium bicarbonate, dissolving the calcium bicarbonate into the solution, transforming sodium in the transformed solution into sodium sulfite, and filtering to obtain primary filter residue and primary filtrate, wherein the primary filtrate is a solution containing sodium sulfite and calcium bicarbonate;
evaporating and concentrating the primary filtrate to crystallize calcium bicarbonate, and cooling, crystallizing and separating sodium sulfite;
or stirring and adding calcium oxide or calcium hydroxide according to the theoretical amount of 1-1.2 times of calcium carbonate converted from calcium bicarbonate in the primary filtrate to precipitate calcium in the form of calcium carbonate, filtering to obtain secondary filter residue and secondary filtrate, and evaporating and concentrating the secondary filtrate to crystallize sodium sulfite.
2. The method for producing sodium sulfite from desulfurized gypsum according to claim 1, wherein: the desulfurized gypsum is the desulfurized gypsum with unoxidized calcium sulfite content more than or equal to 85 wt%.
3. The method for producing sodium sulfite from desulfurized gypsum according to claim 1, wherein: the sodium-containing solution is Na containing at least one of sodium bicarbonate, sodium carbonate and sodium hydroxide+The ion concentration is 25-50 g/L.
4. The method for producing sodium sulfite from desulfurized gypsum according to claim 1, wherein: the transformation means that CO is transformed2And (3) blowing the calcium sulfite into the transformation liquid under pressure, stirring the calcium sulfite for 0.5 to 3.5 hours at the temperature of between 30 and 60 ℃ under the pressure of between 0.005 and 0.15MPa, and transforming the calcium sulfite into calcium bicarbonate.
5. The method for producing sodium sulfite from desulfurized gypsum according to claim 1, wherein: the primary filtrate is evaporated and concentrated, namely 50-80 wt% of calcium bicarbonate in the filtrate is crystallized and separated out;
and (3) evaporating and concentrating the secondary filtrate, namely crystallizing and separating out 60-90 wt% of sodium sulfite in the secondary filtrate.
6. The method for producing sodium sulfite from desulfurized gypsum according to claim 1, wherein: the cooling crystallization condition of the sodium sulfite is that the sodium sulfite is cooled and crystallized for 2-6 h at the temperature of 0-10 ℃.
7. The method for producing sodium sulfite from desulfurized gypsum according to any one of claims 1 to 6, wherein: in the transformation process of the desulfurized gypsum, the yield of the sodium sulfite is more than or equal to 95.6 percent, and the purity of the obtained sodium sulfite product is more than or equal to 97.5 percent.
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| CN202110889185.6A CN113461034B (en) | 2021-08-04 | 2021-08-04 | Method for producing sodium sulfite from desulfurized gypsum |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110889185.6A CN113461034B (en) | 2021-08-04 | 2021-08-04 | Method for producing sodium sulfite from desulfurized gypsum |
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| CN113461034A true CN113461034A (en) | 2021-10-01 |
| CN113461034B CN113461034B (en) | 2022-07-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106966420A (en) * | 2017-03-31 | 2017-07-21 | 贵州省化工研究院 | A kind of method that utilization ardealite prepares high-purity lightweight carbonic acid |
| CN108176202A (en) * | 2017-12-26 | 2018-06-19 | 北京亘源环保有限公司 | A kind of preparation method and application of desulfuration adsorbent |
| CN108285164A (en) * | 2018-02-07 | 2018-07-17 | 纪方知 | A method of separating calcium sulphate and calcium carbonate from waste |
| CN108394920A (en) * | 2017-02-06 | 2018-08-14 | 孟宪昴 | A kind of technique of magnesium sulfite preparing magnesium hydroxide, sodium sulfite |
| TW201838917A (en) * | 2017-04-25 | 2018-11-01 | 洪瑞敏 | Method for separating calcium sulfate and calcium carbonate from desulfurized gypsum waste generated in flue gas desulfurization process with which the purities of the separated calcium sulfate and calcium carbonate are 90% and 100%, respectively |
-
2021
- 2021-08-04 CN CN202110889185.6A patent/CN113461034B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108394920A (en) * | 2017-02-06 | 2018-08-14 | 孟宪昴 | A kind of technique of magnesium sulfite preparing magnesium hydroxide, sodium sulfite |
| CN106966420A (en) * | 2017-03-31 | 2017-07-21 | 贵州省化工研究院 | A kind of method that utilization ardealite prepares high-purity lightweight carbonic acid |
| TW201838917A (en) * | 2017-04-25 | 2018-11-01 | 洪瑞敏 | Method for separating calcium sulfate and calcium carbonate from desulfurized gypsum waste generated in flue gas desulfurization process with which the purities of the separated calcium sulfate and calcium carbonate are 90% and 100%, respectively |
| CN108176202A (en) * | 2017-12-26 | 2018-06-19 | 北京亘源环保有限公司 | A kind of preparation method and application of desulfuration adsorbent |
| CN108285164A (en) * | 2018-02-07 | 2018-07-17 | 纪方知 | A method of separating calcium sulphate and calcium carbonate from waste |
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