CN103880209B - A kind for the treatment of process of sodium sulfate wastewater - Google Patents
A kind for the treatment of process of sodium sulfate wastewater Download PDFInfo
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- CN103880209B CN103880209B CN201410090322.XA CN201410090322A CN103880209B CN 103880209 B CN103880209 B CN 103880209B CN 201410090322 A CN201410090322 A CN 201410090322A CN 103880209 B CN103880209 B CN 103880209B
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- sodium
- sulfate
- zinc
- phosphate
- precipitation agent
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- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 title claims abstract description 36
- 229910052938 sodium sulfate Inorganic materials 0.000 title claims abstract description 36
- 235000011152 sodium sulphate Nutrition 0.000 title claims abstract description 36
- 239000002351 wastewater Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 32
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 32
- 238000001556 precipitation Methods 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- RTOOMIOWOJBNTK-UHFFFAOYSA-K sodium;zinc;phosphate Chemical compound [Na+].[Zn+2].[O-]P([O-])([O-])=O RTOOMIOWOJBNTK-UHFFFAOYSA-K 0.000 claims abstract description 21
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims abstract description 20
- 235000019799 monosodium phosphate Nutrition 0.000 claims abstract description 20
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims abstract description 20
- 238000009388 chemical precipitation Methods 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011701 zinc Substances 0.000 claims abstract description 11
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 11
- 239000000706 filtrate Substances 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 34
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 9
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 8
- IOPOLWHQYJSKCT-UHFFFAOYSA-L barium(2+);dihydrogen phosphate Chemical compound [Ba+2].OP(O)([O-])=O.OP(O)([O-])=O IOPOLWHQYJSKCT-UHFFFAOYSA-L 0.000 claims description 6
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 claims description 6
- 239000001506 calcium phosphate Substances 0.000 claims description 6
- 229910000150 monocalcium phosphate Inorganic materials 0.000 claims description 6
- 235000019691 monocalcium phosphate Nutrition 0.000 claims description 6
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 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
- 239000011259 mixed solution Substances 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 claims description 4
- 239000011787 zinc oxide Substances 0.000 claims description 4
- UEZVMMHDMIWARA-UHFFFAOYSA-N Metaphosphoric acid Chemical compound OP(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-N 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 claims description 3
- 229940007718 zinc hydroxide Drugs 0.000 claims description 3
- 229910021511 zinc hydroxide Inorganic materials 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- 229920000137 polyphosphoric acid Polymers 0.000 claims description 2
- UOURRHZRLGCVDA-UHFFFAOYSA-D pentazinc;dicarbonate;hexahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[O-]C([O-])=O.[O-]C([O-])=O UOURRHZRLGCVDA-UHFFFAOYSA-D 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 13
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 abstract description 12
- 229910001415 sodium ion Inorganic materials 0.000 abstract description 12
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 14
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 12
- 239000007787 solid Substances 0.000 description 8
- 235000011132 calcium sulphate Nutrition 0.000 description 7
- 206010013786 Dry skin Diseases 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 3
- FMRLDPWIRHBCCC-UHFFFAOYSA-L Zinc carbonate Chemical compound [Zn+2].[O-]C([O-])=O FMRLDPWIRHBCCC-UHFFFAOYSA-L 0.000 description 2
- 239000001175 calcium sulphate Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000011667 zinc carbonate Substances 0.000 description 2
- 235000004416 zinc carbonate Nutrition 0.000 description 2
- 229910000010 zinc carbonate Inorganic materials 0.000 description 2
- 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 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- NIAGBSSWEZDNMT-UHFFFAOYSA-M tetraoxidosulfate(.1-) Chemical compound [O]S([O-])(=O)=O NIAGBSSWEZDNMT-UHFFFAOYSA-M 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a kind for the treatment of process of sodium sulfate wastewater.The treating method comprises following steps: in sodium sulfate wastewater, add chemical precipitation agent, then by reacting liquid filtering, obtain sulfate precipitation and sodium dihydrogen phosphate; Joined by zinc-containing substance in sodium dihydrogen phosphate, reaction 2 ~ 24h, then by reacting liquid filtering, obtains sodium-zinc-phosphate throw out and filtrate.The present invention can obtain sulfate precipitation thing and the higher sodium-zinc-phosphate of added value, and the rate of recovery of sulfate ion and sodium ion can up to more than 99.3%.
Description
Technical field
The invention belongs to field of waste water treatment, be specifically related to a kind for the treatment of process of sodium sulfate wastewater.
Background technology
Contains sodium sulfate waste water is a kind of source of pollution common in multiple industry, if be directly discharged in physical environment without purifying treatment, the salinity of water body and soil can be caused to raise, spoiled soil structure, cause soil compaction, be unfavorable for vegeto-animal growth, to environment.The treatment process of current sodium sulfate wastewater roughly has two kinds: one to be add liming to make it to generate calcium sulfate precipitation and sodium hydroxide solution; Two is carry out condensing crystal to it, extracts sodium sulfate.Obviously, these two kinds of methods all can only obtain low value-added Industrial products; Prepare the product of dry state if want, energy consumption is very high again.The fundamental drawback of these two kinds of methods is: the rate of recovery of sulfate ion and sodium ion is lower, and in the water after process, the concentration of sodium ion is still very high.
Summary of the invention
For solving the shortcoming and defect part of prior art, the object of the present invention is to provide a kind for the treatment of process of sodium sulfate wastewater, sulfate radical and sodium ion can be made under high conversion to separate from water in the mode of precipitation respectively by the method.
For achieving the above object, the present invention adopts following technical scheme:
A treatment process for sodium sulfate wastewater, comprises the following steps:
(1) in sodium sulfate wastewater, add chemical precipitation agent, then by reacting liquid filtering, obtain sulfate precipitation and sodium dihydrogen phosphate;
(2) joined by zinc-containing substance in the sodium dihydrogen phosphate that step (1) obtains, reaction 4 ~ 24h, then by reacting liquid filtering, obtains sodium-zinc-phosphate throw out and filtrate.
After the inventive method process, in sodium sulfate wastewater, the rate of recovery of sulfate ion and sodium ion can up to more than 99.3%.
Preferably, the chemical equivalent of the sodium sulfate in sodium sulfate wastewater, chemical precipitation agent and zinc-containing substance is respectively 1 part, 1 part and 2 parts.
Preferably, the chemical precipitation agent described in step (1) be sulfate ion precipitation agent and, phosphoric acid or react a kind of combination only generated in the compound of phosphoric acid with water; The specific operation process of step (1) is as follows:
A sulfate ion precipitation agent adds in sodium sulfate wastewater by (), reaction 4 ~ 24h, obtains mixed solution; Then filter, obtain sulfate precipitation and sodium hydroxide solution;
B () is by phosphoric acid or react with water the compound only generating phosphoric acid and add in the sodium hydroxide solution that step (a) obtains, and generates sodium dihydrogen phosphate.
Preferred, described sulfate ion precipitation agent is with, phosphoric acid or reacting with water the compound only generating phosphoric acid is respectively 1 part and 2 parts according to the chemical equivalent of sulfate ion precipitation agent and phosphoric.
Preferred, described sulfate ion precipitation agent is the one in calcium oxide, calcium hydroxide, barium oxide or hydrated barta.
Preferred, the described compound only generating phosphoric acid that reacts with water is one in phosphoric anhydride, metaphosphoric acid or polyphosphoric acid.
Preferred, the sulfate precipitation that step (a) obtains is through spray washing 1 ~ 2 post-drying, and leacheate and sodium hydroxide solution are mixed into next operation steps.
Preferably, the chemical precipitation agent described in step (1) is barium dihydrogen phosphate or monocalcium phosphate; The specific operation process of step (1) is as follows: add in sodium sulfate wastewater by barium dihydrogen phosphate or monocalcium phosphate, and reaction 4 ~ 24h, then filters, obtain sulfate precipitation and sodium dihydrogen phosphate.
Preferably, the zinc-containing substance described in step (2) is at least one in metallic zinc, zinc oxide, zinc hydroxide and zinc carbonate.
Preferably, the sodium-zinc-phosphate throw out that obtains of step (2) is through spray washing 1 ~ 2 post-drying.
Principle of the present invention is: in the sodium sulfate wastewater of concentration known, add chemical precipitation agent and zinc-containing substance successively, and the throw out that each step obtains is separated, washs and dry, thus obtain sulfate precipitation thing and the higher sodium-zinc-phosphate of added value, and the rate of recovery of sulfate ion and sodium ion can up to more than 99.3%.Above method can represent with following chemical equation:
Na
2SO
4+CaO+H
2O＝CaSO
4↓+2NaOH
NaOH+H
3PO
4＝NaH
2PO
4+H
2O
NaH
2PO
4+ZnO＝NaZnPO
4↓+H
2O
Compared with prior art, the present invention has the following advantages and beneficial effect:
(1) treatment process of sodium sulfate wastewater of the present invention can make sulfate ion and sodium ion separate from water in the mode of precipitation respectively, and obtain sulfate precipitation thing and sodium-zinc-phosphate, the rate of recovery of sulfate ion and sodium ion is up to more than 99.3%.
(2) the present invention does not need condensing crystal just the sodium element in waste water to be precipitated, and energy consumption is low, and sodium-zinc-phosphate is as a kind of novel macroporous catalyst, has high added value.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
A treatment process for sodium sulfate wastewater, comprises the following steps:
(1) get the sodium sulfate wastewater that 1L concentration is 1.25mol/L, add 70g calcium oxide in sodium sulfate wastewater, reaction 24h, then filters, obtains calcium sulfate precipitation and sodium hydroxide solution; By calcium sulfate precipitation drip washing 2 post-dryings, obtain calcium sulphate solid 167g, theoretical yield is 98.23%, and after conversion, the rate of recovery of sulfate ion reaches 98.23%;
(2), after leacheate mixes with sodium hydroxide solution, in mixed solution, add the phosphoric acid that 283g massfraction is 85%, obtain sodium dihydrogen phosphate;
(3) joined by 200g zinc oxide in the sodium dihydrogen phosphate that step (2) obtains, reaction 4h, then filters, obtains sodium-zinc-phosphate throw out and filtrate; By sodium-zinc-phosphate throw out drip washing 1 post-drying, obtain sodium-zinc-phosphate solid 450g, theoretical yield is 98.15%, and after conversion, the rate of recovery of sodium ion reaches 98.15%.
Embodiment 2
A treatment process for sodium sulfate wastewater, comprises the following steps:
(1) get the sodium sulfate wastewater that 1L concentration is 1.25mol/L, add 214g hydrated barta in sodium sulfate wastewater, reaction 4h, then filters, obtains barium sulfate precipitate and sodium hydroxide solution; By barium sulfate precipitate drip washing 2 post-dryings, obtain barium sulfate solid 290g, theoretical yield is 99.57%, and after conversion, the sulfate ion rate of recovery reaches 99.57%;
(2), after leacheate mixes with sodium hydroxide solution, in mixed solution, add 200g metaphosphoric acid, obtain sodium dihydrogen phosphate;
(3) joined by 312g zinc carbonate in the sodium dihydrogen phosphate that step (2) obtains, reaction 16h, then filters, obtains sodium-zinc-phosphate throw out and filtrate; By sodium-zinc-phosphate throw out drip washing 1 post-drying, obtain sodium-zinc-phosphate solid 454g, theoretical yield is 99.23%, and after conversion, the rate of recovery of sodium ion reaches 99.23%.
Embodiment 3
A treatment process for sodium sulfate wastewater, comprises the following steps:
(1) get the sodium sulfate wastewater that 1L concentration is 1.25mol/L, add 292g monocalcium phosphate in sodium sulfate wastewater, reaction 24h, then filters, obtains calcium sulfate precipitation and sodium dihydrogen phosphate; By calcium sulfate precipitation drip washing 2 post-dryings, obtain calcium sulphate solid 166g, theoretical yield is 97.65%, and after conversion, the sulfate ion rate of recovery reaches 97.65%; Leacheate mixes with sodium dihydrogen phosphate, enters next step;
(2) joined by 243g zinc hydroxide in the sodium dihydrogen phosphate that step (1) obtains, reaction 8h, then filters, obtains sodium-zinc-phosphate throw out and filtrate; By sodium-zinc-phosphate throw out drip washing 1 post-drying, obtain sodium-zinc-phosphate solid 447g, theoretical yield is 97.49%, and after conversion, the rate of recovery of sodium ion reaches 97.49%.
Embodiment 4
A treatment process for sodium sulfate wastewater, comprises the following steps:
(1) get the sodium sulfate wastewater that 1L concentration is 1.25mol/L, add 414g barium dihydrogen phosphate in sodium sulfate wastewater, reaction 4h, then filters, obtains barium sulfate precipitate and sodium dihydrogen phosphate; By barium sulfate precipitate drip washing 2 post-dryings, obtain barium sulfate solid 288.4g, theoretical yield is 99%, and after conversion, the sulfate ion rate of recovery reaches 99%; Leacheate mixes with sodium dihydrogen phosphate, enters next step;
(2) 163g metallic zinc joined in the sodium dihydrogen phosphate that step (1) obtains, reaction 24h, then filters, obtains sodium-zinc-phosphate throw out and filtrate; By sodium-zinc-phosphate throw out drip washing 1 post-drying, obtain sodium-zinc-phosphate solid 453g, theoretical yield is 99%, and after conversion, the rate of recovery of sodium ion reaches 99%.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from spirit of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (8)
1. a treatment process for sodium sulfate wastewater, is characterized in that, comprises the following steps:
(1) in sodium sulfate wastewater, add chemical precipitation agent, then by reacting liquid filtering, obtain sulfate precipitation and sodium dihydrogen phosphate;
(2) joined by zinc-containing substance in the sodium dihydrogen phosphate that step (1) obtains, reaction 2 ~ 24h, then by reacting liquid filtering, obtains sodium-zinc-phosphate throw out and filtrate;
Chemical precipitation agent described in step (1) be sulfate ion precipitation agent and, phosphoric acid or react a kind of combination only generated in the compound of phosphoric acid with water, wherein said sulfate ion precipitation agent is the one in calcium oxide, calcium hydroxide, barium oxide or hydrated barta; Or the chemical precipitation agent described in step (1) is barium dihydrogen phosphate or monocalcium phosphate;
Zinc-containing substance described in step (2) is at least one in metallic zinc, zinc oxide, zinc hydroxide and zinc subcarbonate.
2. treatment process according to claim 1, is characterized in that, the chemical equivalent of the sodium sulfate in sodium sulfate wastewater, chemical precipitation agent and zinc-containing substance is respectively 1 part, 1 ~ 2 part and 1 part.
3. treatment process according to claim 1, is characterized in that, the chemical precipitation agent described in step (1) be sulfate ion precipitation agent and, phosphoric acid or react a kind of combination only generated in the compound of phosphoric acid with water; The specific operation process of step (1) is as follows:
A sulfate ion precipitation agent adds in sodium sulfate wastewater by (), reaction 4 ~ 24h, obtains mixed solution; Then filter, obtain sulfate precipitation and sodium hydroxide solution;
B () is by phosphoric acid or react with water the compound only generating phosphoric acid and add in the sodium hydroxide solution that step (a) obtains, and generates sodium dihydrogen phosphate.
4. treatment process according to claim 3, is characterized in that, described sulfate ion precipitation agent is with, phosphoric acid or reacting with water the stoichiometric ratio only generating the compound of phosphoric acid is 1:1.
5. treatment process according to claim 3, is characterized in that, the described compound only generating phosphoric acid that reacts with water is one in phosphoric anhydride, metaphosphoric acid or polyphosphoric acid.
6. treatment process according to claim 3, is characterized in that, the sulfate precipitation that step (a) obtains is through spray washing 1 ~ 2 post-drying, and leacheate and sodium hydroxide solution are mixed into next operation steps.
7. treatment process according to claim 1, is characterized in that, the chemical precipitation agent described in step (1) is barium dihydrogen phosphate or monocalcium phosphate; The specific operation process of step (1) is as follows: barium dihydrogen phosphate or monocalcium phosphate are added in sodium sulfate wastewater, and react 4 ~ 24h, then filter, and obtains sulfate precipitation and sodium dihydrogen phosphate.
8. treatment process according to claim 1, is characterized in that, the sodium-zinc-phosphate throw out that step (2) obtains is through spray washing 1 ~ 2 post-drying.
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| CN103880209B true CN103880209B (en) | 2015-08-12 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150456B (en) * | 2014-08-13 | 2016-06-08 | 连云港市德邦精细化工有限公司 | The method producing synthos and sodium ascorbyl phosphate with sodium sulfate wastewater |
| CN104445721B (en) * | 2014-11-19 | 2016-05-11 | 南通新邦化工科技有限公司 | A kind of stearate waste water combination treatment method |
| CN104891465A (en) * | 2015-05-29 | 2015-09-09 | 湖北三宁化工股份有限公司 | Method for preparing potassium dihydrogen phosphate from industrial monoammonium phosphate mother solution |
| CN104998611B (en) * | 2015-07-17 | 2017-03-08 | 河海大学 | A kind of barium base method for preparing modified bentonite and application |
| CN105776466B (en) * | 2016-03-14 | 2018-06-15 | 湖北徐风环保科技有限公司 | A kind of purification method of sodium sulfate wastewater |
| CN109704897B (en) * | 2018-12-19 | 2020-07-03 | 安徽节源环保科技有限公司 | Wastewater recycling method based on dimethyl sulfate |
| CN113029852A (en) * | 2021-02-22 | 2021-06-25 | 天津钢管制造有限公司 | Method for detecting content of sodium sulfate in oxide removing agent |
| CN114524545A (en) * | 2022-03-03 | 2022-05-24 | 盛隆资源再生（无锡）有限公司 | Method for recycling wastewater containing sodium sulfate |
| CN116443837A (en) * | 2023-02-28 | 2023-07-18 | 贵州胜威福全化工有限公司 | Method for preparing sodium hexametaphosphate from sodium sulfate and phosphoric acid |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5055201A (en) * | 1989-08-04 | 1991-10-08 | Tiegel Manufacturing Company | Process for removing dissolved contaminants from aqueous solutions using reversibly dispersible getters |
| US5346620A (en) * | 1993-08-31 | 1994-09-13 | Basf Corporation | Process for waste water treatment by removal of sodium sulfate |
| CN100448789C (en) * | 2006-12-05 | 2009-01-07 | 攀枝花钢企瑞通制冷设备有限公司 | Technique for treating industrial wastewater of containing sodium sulfate |
| CN102241448B (en) * | 2010-12-29 | 2012-11-28 | 厦门紫金矿冶技术有限公司 | Comprehensive utilization method of sodium sulfate wastewater |
-
2014
- 2014-03-12 CN CN201410090322.XA patent/CN103880209B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5055201A (en) * | 1989-08-04 | 1991-10-08 | Tiegel Manufacturing Company | Process for removing dissolved contaminants from aqueous solutions using reversibly dispersible getters |
| US5346620A (en) * | 1993-08-31 | 1994-09-13 | Basf Corporation | Process for waste water treatment by removal of sodium sulfate |
| CN100448789C (en) * | 2006-12-05 | 2009-01-07 | 攀枝花钢企瑞通制冷设备有限公司 | Technique for treating industrial wastewater of containing sodium sulfate |
| CN102241448B (en) * | 2010-12-29 | 2012-11-28 | 厦门紫金矿冶技术有限公司 | Comprehensive utilization method of sodium sulfate wastewater |
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