CN112429896B - Treatment method of salt mud produced in chlor-alkali production - Google Patents
Treatment method of salt mud produced in chlor-alkali production Download PDFInfo
- Publication number
- CN112429896B CN112429896B CN202011186143.8A CN202011186143A CN112429896B CN 112429896 B CN112429896 B CN 112429896B CN 202011186143 A CN202011186143 A CN 202011186143A CN 112429896 B CN112429896 B CN 112429896B
- Authority
- CN
- China
- Prior art keywords
- chlor
- nacl
- alkali production
- mud produced
- salt mud
- 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.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
-
- 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
- C02F2101/12—Halogens or halogen-containing compounds
-
- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
Abstract
The invention belongs to the technical field of environmental protection treatment, and discloses a method for treating salt mud produced in chlor-alkali production, which comprises the following steps: pulping and washing salt mud produced in chlor-alkali production by using clear water obtained by reverse osmosis, conveying the slurry to a ceramic membrane for filtration to obtain a NaCl clear solution and a first concentrated solution; filtering NaCl clear solution with reverse osmosis membrane to obtain second concentrated solution and clear water, dissolving Natrii sulfas in the second concentrated solution to obtain NaCl-Na 2 SO 4 A system; neutralizing the first concentrated solution and the chlorinated waste acid until no bubbles are generated; performing neutralization reaction on the calcium carbide slurry and the waste liquid obtained in the last step until the pH is =10, adding a flocculating agent for sedimentation, and performing filter pressing to obtain calcium chloride wastewater; naCl-Na is added 2 SO 4 Reacting the system with calcium chloride wastewater, and performing filter pressing to obtain crude brine; the crude brine was subjected to MVR to obtain pure NaCl. The treatment method can realize the recovery of sodium chloride in the salt slurry, and simultaneously saves alkali for neutralizing the waste acid chloride.
Description
Technical Field
The invention belongs to the technical field of environmental protection treatment, and particularly relates to a treatment method of salt mud produced in chlor-alkali production.
Background
In chlor-alkali production, brine refining produces a large amount of brine sludge, the main component of which is calcium carbonate, and a portion of magnesium hydroxide, sodium chloride and 30% water. Because the salt mud generated in the production of chlor-alkali has high salt content and alkaline leached pH, the salt mud cannot meet the requirement of environmental protection discharge and cannot be discharged as general waste, and the clean production of chlor-alkali is seriously restricted.
In the prior art, a mud washing barrel is used for washing salt, salt water containing salt mud is directly subjected to filter pressing and discharged by adopting a plate-and-frame filter press, sodium chloride in the salt mud cannot be completely washed out, and even if water is added in the filter pressing process, the washed sodium chloride only accounts for 50% of the total amount and cannot be discharged up to the standard. Meanwhile, the mud washing barrel has large investment, poor effect and complex operation.
At present, the problem that salt mud in chlor-alkali production has high salt content and cannot be directly discharged or utilized is not solved by a new process technology. The salt mud can only be discharged out of order as wastes, and the clean production can not be realized.
Disclosure of Invention
In view of the above situation, the present invention aims to provide a treatment method for producing salt slurry in chlor-alkali production, which combines the treatment of salt slurry with the neutralization technology of titanium white waste acid (waste acid chloride) produced by chlorination process, wherein the salt slurry replaces a part of alkali (calcium carbide slurry) for neutralizing the waste acid chloride, and the alkali amount is saved by 90kg/m 3 Acid and simultaneously realizes the recovery of sodium chloride in the salt slurry.
The invention provides a method for treating salt mud produced in chlor-alkali production, which comprises the following steps:
(1) Pulping and washing salt mud produced in chlor-alkali production by using clear water obtained by reverse osmosis, conveying the slurry to a ceramic membrane for filtration to obtain a NaCl clear solution and a first concentrated solution;
(2) Filtering NaCl clear solution with reverse osmosis membrane to obtain second concentrated solution and clear water, dissolving Natrii sulfas in the second concentrated solution to obtain NaCl-Na 2 SO 4 A system;
(3) Neutralizing the first concentrated solution and the chlorinated waste acid until no bubbles are generated;
(4) Carrying out neutralization reaction on the calcium carbide slurry and the waste liquid obtained in the step (3) until the pH value is =10, adding a flocculating agent for sedimentation, and carrying out filter pressing to obtain calcium chloride wastewater;
(5) Adding the NaCl-Na 2 SO 4 Reacting the system with the calcium chloride wastewater, and performing filter pressing to obtain crude brine;
(6) The crude brine is subjected to MVR (mechanical vapor recompression) to obtain pure NaCl.
In the invention, the water content of the salt mud produced in the chlor-alkali production is 27-30%, the Ca content is 0.24-0.27g/g of the salt mud, and the Mg content is 0.012-0.016g/g of the salt mud.
According to the invention, in the step 3), during pulping and washing, the mass ratio of the salt mud produced in chlor-alkali production to the clear water is 1: 4-6.
Preferably, the ceramic membrane has a 50nm, 17-channel pore size.
In the invention, the concentration of NaCl in the NaCl clear liquid is 17-25g/L; naCl-Na 2 SO 4 The concentration of NaCl in the system is 210-313g/L, na 2 SO 4 The concentration of (B) is 18wt%.
And (3) clear water obtained by reverse osmosis in the step 2) can be used in the step 1) and can also be recycled in other processes in a plant area.
According to the invention, the acid concentration of the waste acid is 0.8-1.2mol/L, the pH value of the reaction of the first concentrated solution and the waste acid is controlled to be 3-4, and the reaction temperature is 55 ℃.
Preferably, the mass ratio of the carbide mud to the water in the carbide mud slurry is 1: 2.
In the invention, the flocculant can be polyacrylamide, and the dosage of the flocculant is 0.3-0.6% of the total mass of the reaction system in the step (4).
The processes not limited in the present invention are performed by conventional methods, for example, ceramic membrane filtration, reverse osmosis membrane filtration, filter pressing, MVR, etc.
Compared with the prior art, the invention has the following beneficial effects:
the invention combines the treatment of the salt mud produced in the chlor-alkali production with the treatment of the waste chlorination acid, uses the salt mud for the neutralization of the waste chlorination acid, saves the consumption of the carbide mud, reduces the investment, and simultaneously recovers the sodium chloride in the salt mud.
Drawings
Fig. 1 is a process flow diagram of the treatment method of the salt slurry produced in the chlor-alkali production of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the embodiments of the present invention, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Examples
A treatment method of salt mud produced in chlor-alkali production comprises the following steps:
(1) Pulping and washing salt mud produced in chlor-alkali production and clear water obtained by reverse osmosis (the mass ratio of the salt mud to the clear water is 1: 6), conveying slurry to a ceramic membrane for filtration, wherein the analysis of the main components of the salt mud is shown in Table 1, the aperture of the ceramic membrane is 50nm, and the ceramic membrane is 17-channel type;
(2) Filtering the clear water filtered by the ceramic membrane with a reverse osmosis membrane (RO membrane) which can intercept NaCl, recycling the clear water obtained by reverse osmosis in the step 1) and other procedures in the plant area, and dissolving the purchased mirabilite with a concentrated solution (NaCl) to obtain NaCl-Na 2 SO 4 The concentrations of the systems are shown in Table 2;
(3) The concentrated solution filtered by the ceramic membrane replaces a part of carbide mud, the waste chlorination acid (the acid concentration of the waste chlorination acid is 1 mol/L) is neutralized, the pH can be raised to 4.0 until no bubbling occurs, and the reaction temperature is 55 ℃;
(4) Pulping purchased calcium carbide mud and water, wherein the mass ratio of the calcium carbide mud to the water is 1: 2, continuously neutralizing the waste liquid of the step (3) by slurry until the pH is =10, settling by adding polyacrylamide, and then sending the waste liquid to a filter press for filter pressing, wherein the dosage of the polyacrylamide is 0.5 percent of the total mass of the reaction system, and the dosage of the calcium carbide mud is 0.221t calcium carbide mud/m 3 The output of the waste acid is 1100m 3 And the total dosage of the carbide mud is 243.1t/d. The concentrations of TOC, inorganic ammonium, total ammonium, ca, mg and Cl in the calcium chloride wastewater neutralized by the first concentrated solution and the calcium carbide mud are shown in Table 3;
(5) NaCl-Na obtained in the step (2) 2 SO 4 Reacting with the calcium chloride wastewater obtained by filter pressing in the step (4), and obtaining crude brine by filter pressing;
(6) The crude brine was subjected to MVR to obtain pure NaCl, which was used as a raw material for electrolysis, and the composition analysis of NaCl is shown in Table 4.
Comparative example
Pulping by adopting purchased calcium carbide mud and water, wherein the mass ratio of the calcium carbide mud to the water is 1: 2, neutralizing the chlorinated waste acid (the acid concentration of the chlorinated waste acid is 1 mol/L) to pH =10 by slurry, settling by adding polyacrylamide, and then conveying to a filter press for filter pressing, wherein the dosage of the polyacrylamide is 0.5% of the total mass of a reaction system. The dosage of the carbide mud is 0.31t carbide mud/m 3 The output of the waste acid is 1100m 3 And the total dosage of the carbide mud is 341t/d. Calcium chloride waste neutralized by calcium carbide mudThe concentrations of TOC, inorganic ammonium, total ammonium, ca, mg and Cl in the water are shown in Table 3.
TABLE 1
| Composition (A) | Ca | Mg | Water content ratio |
| Content (wt.) | 0.24g/g salty mud | 0.013g/g salty mud | 27.57％ |
TABLE 2
TABLE 3
TABLE 4
Produced by using waste acid of chlorinationThe amount is 1100m 3 And d, calculating, wherein the saving amount of the carbide mud is 97.9t/d, the price of the carbide mud is 60 yuan/t, and the neutralization cost is 5874 yuan/d. It can be seen from table 3 that after the salt mud is used for replacing a part of the carbide mud and is neutralized with the waste acid chloride, the concentrations of TOC, inorganic ammonium and total ammonium in the obtained calcium chloride wastewater are all reduced, the Cl concentration is increased, and the further treatment of the calcium chloride wastewater in the later period is facilitated.
While embodiments of the present invention have been described above, the above description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (8)
1. A treatment method of salt mud produced in chlor-alkali production is characterized by comprising the following steps:
(1) Pulping and washing salt mud produced in chlor-alkali production by using clear water obtained by reverse osmosis, conveying the slurry to a ceramic membrane for filtration to obtain a NaCl clear solution and a first concentrated solution;
(2) Filtering NaCl clear solution with reverse osmosis membrane to obtain second concentrated solution and clear water, dissolving Natrii sulfas in the second concentrated solution to obtain NaCl-Na 2 SO 4 A system;
(3) Neutralizing the first concentrated solution and titanium white waste acid obtained by a chlorination process until no bubbling occurs;
(4) Carrying out neutralization reaction on the calcium carbide slurry and the waste liquid obtained in the step (3) until the pH value is =10, adding a flocculating agent for sedimentation, and carrying out filter pressing to obtain calcium chloride wastewater;
(5) Adding the NaCl-Na 2 SO 4 Reacting the system with the calcium chloride wastewater, and performing filter pressing to obtain crude brine;
(6) The crude brine was subjected to MVR to obtain pure NaCl.
2. The method for treating the salty mud produced in the chlor-alkali production as claimed in claim 1, wherein: the water content of the salt mud produced in the chlor-alkali production is 27-30%, the Ca content is 0.24-0.27g/g of the salt mud, and the Mg content is 0.012-0.016g/g of the salt mud.
3. The method for treating salt mud produced in chlor-alkali production according to claim 1 or 2, characterized in that: in the step (3), when pulping and washing, the mass ratio of the salt mud produced in the chlor-alkali production to the clear water is 1: 4-6.
4. The method for treating the salty mud produced in the chlor-alkali production as claimed in claim 1, wherein: the aperture of the ceramic membrane is 50nm and is 17 channel type.
5. The method for treating salt mud produced in chlor-alkali production according to claim 1, characterized in that: the concentration of NaCl in the NaCl clear liquid is 17-25g/L; naCl-Na 2 SO 4 The concentration of NaCl in the system is 210-313g/L, na 2 SO 4 The concentration of (B) is 18wt%.
6. The method for treating the salty mud produced in the chlor-alkali production as claimed in claim 1, wherein: the acid concentration of the titanium white waste acid obtained by the chlorination process is 0.8-1.2mol/L, the pH value of the reaction of the first concentrated solution and the titanium white waste acid obtained by the chlorination process is controlled to be 3-4, and the reaction temperature is 55 ℃.
7. The method for treating salt mud produced in chlor-alkali production according to claim 1, characterized in that: in the carbide slurry, the mass ratio of the carbide slurry to the water is 1: 2.
8. The method for treating salt mud produced in chlor-alkali production according to claim 1, characterized in that: the flocculant is polyacrylamide, and the dosage of the flocculant is 0.3-0.6% of the total mass of the reaction system in the step (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011186143.8A CN112429896B (en) | 2020-10-29 | 2020-10-29 | Treatment method of salt mud produced in chlor-alkali production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011186143.8A CN112429896B (en) | 2020-10-29 | 2020-10-29 | Treatment method of salt mud produced in chlor-alkali production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112429896A CN112429896A (en) | 2021-03-02 |
| CN112429896B true CN112429896B (en) | 2022-10-25 |
Family
ID=74694728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011186143.8A Active CN112429896B (en) | 2020-10-29 | 2020-10-29 | Treatment method of salt mud produced in chlor-alkali production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112429896B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102070163A (en) * | 2010-04-30 | 2011-05-25 | 汪晋强 | Method for preparing magnesium carbonate to co-produce calcium carbonate and sodium sulfate by using pure alkali waste salt sludge |
| CN102587979A (en) * | 2012-01-19 | 2012-07-18 | 湖北双环科技股份有限公司 | Method for treating salty mud generated in rock salt solution mining sodium sulfate type brine purification |
| CN102580483A (en) * | 2012-01-10 | 2012-07-18 | 山东海天生物化工有限公司 | Desulfuration method in sodium carbonate production |
| CN107892313A (en) * | 2017-12-30 | 2018-04-10 | 唐山三友化工股份有限公司 | Utilize saltcake refined brine and the process units and production method of by-product dihydrate gypsum |
| CN207238736U (en) * | 2017-08-30 | 2018-04-17 | 内蒙古兰太实业股份有限公司 | The processing system of waste brine sludge in production of sodium chlorate |
| CN108862729A (en) * | 2018-07-17 | 2018-11-23 | 莘县华祥盐化有限公司 | A kind of method of chlor-alkali salt sludge sub-prime recycling comprehensive utilization |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1137488A (en) * | 1995-06-08 | 1996-12-11 | 福建省福州第二化工厂职工技术协会 | Process for preparing magnesium sulfate by using chlorine alkali offscum salt slurry |
| CN100556809C (en) * | 2006-08-02 | 2009-11-04 | 天津大沽化工股份有限公司 | The washing methods of salty mud in diaphragm aqueous alkali evaporating system |
| CN101486446B (en) * | 2009-01-12 | 2011-02-09 | 王嘉兴 | Method for coproduction of bleaching powder, active carbon, sodium chloride and sulphuric acid from waste gypsum plaster |
| CN101624204B (en) * | 2009-01-12 | 2011-05-18 | 王嘉兴 | Four-great circulation method formed by waste gypsum mud and chlor-alkali industry |
| CN101602487B (en) * | 2009-03-03 | 2012-04-25 | 王嘉兴 | Preparation method of calcium hypochlorite, sodium chloride and sulfuric acid employing limestone |
| CN104496093B (en) * | 2014-11-04 | 2017-01-25 | 江苏大学 | Method for performing purification treatment on titanium white wastewater by utilizing salt slurry |
| CN105129822B (en) * | 2015-08-03 | 2017-01-18 | 宜宾海丰和锐有限公司 | System and method for treating chlor-alkali production byproduct salt mud |
| CN105923646A (en) * | 2016-05-05 | 2016-09-07 | 中盐金坛盐化有限责任公司 | Resource comprehensive utilization for salty mud |
| CN106497517B (en) * | 2016-08-28 | 2018-06-12 | 中盐金坛盐化有限责任公司 | A kind of method for preparing organic environmental-protection deicing salt using two alkaline process salt slurries |
| KR20180085255A (en) * | 2017-01-18 | 2018-07-26 | 주식회사 화류테크 | Method for recovering Tin and silver metal and continuously from Tin scrap containing Tin and silver |
| CN108793208B (en) * | 2018-07-17 | 2020-03-03 | 莘县华祥盐化有限公司 | Process for producing magnesium sulfate by comprehensively utilizing salt mud and waste acid |
| CN211330697U (en) * | 2019-12-12 | 2020-08-25 | 内蒙古兰太实业股份有限公司 | Sodium chlorate contains processing system of chromium salt mud |
| CN111115666B (en) * | 2020-01-09 | 2021-06-22 | 西安交通大学 | Reduction treatment process for salt mud in chlor-alkali industry |
| CN111204780B (en) * | 2020-01-09 | 2021-04-27 | 西安交通大学 | Resource utilization process of salt mud in chlor-alkali industry |
-
2020
- 2020-10-29 CN CN202011186143.8A patent/CN112429896B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102070163A (en) * | 2010-04-30 | 2011-05-25 | 汪晋强 | Method for preparing magnesium carbonate to co-produce calcium carbonate and sodium sulfate by using pure alkali waste salt sludge |
| CN102580483A (en) * | 2012-01-10 | 2012-07-18 | 山东海天生物化工有限公司 | Desulfuration method in sodium carbonate production |
| CN102587979A (en) * | 2012-01-19 | 2012-07-18 | 湖北双环科技股份有限公司 | Method for treating salty mud generated in rock salt solution mining sodium sulfate type brine purification |
| CN207238736U (en) * | 2017-08-30 | 2018-04-17 | 内蒙古兰太实业股份有限公司 | The processing system of waste brine sludge in production of sodium chlorate |
| CN107892313A (en) * | 2017-12-30 | 2018-04-10 | 唐山三友化工股份有限公司 | Utilize saltcake refined brine and the process units and production method of by-product dihydrate gypsum |
| CN108862729A (en) * | 2018-07-17 | 2018-11-23 | 莘县华祥盐化有限公司 | A kind of method of chlor-alkali salt sludge sub-prime recycling comprehensive utilization |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112429896A (en) | 2021-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2022100313A1 (en) | Mine water advanced treatment system and mine water treatment method thereof | |
| CN101214975A (en) | Advanced treatment technique for brine | |
| CN104909494A (en) | Process for impurity removal and purification of industrial high-concentration brine and special equipment of process | |
| CN103382033B (en) | A kind of substep extracts the technique of the solid matter of salt refining process generation | |
| CN111170340A (en) | Method for recovering salt and nitrate from salt and nitrate waste brine | |
| CN101407366A (en) | Method for rapidly recycling chrome from chroming waste liquor by alkali precipitation | |
| CN106830492B (en) | Treatment method of methoxy acrylic ester pesticide product wastewater | |
| CN112225355A (en) | Shale gas recovery flowback fluid treatment process | |
| CN106495187A (en) | Bi-membrane method purification salt zero-discharge production process | |
| CN112429896B (en) | Treatment method of salt mud produced in chlor-alkali production | |
| CN113582224A (en) | Resource utilization method for titanium white waste acid leaching fused salt chlorination slag | |
| CN110818138A (en) | Chlor-alkali wastewater treatment method | |
| CN216891247U (en) | Zero discharge system of chlor-alkali device | |
| CN110980847A (en) | Treatment and recovery system and method for waste alkali in methane chloride production | |
| JPS61101416A (en) | Purification of saline water | |
| CN104817123A (en) | Process for extracting zinc salt from waste water containing zinc | |
| CN113401924A (en) | Brine refining method | |
| CN110451679B (en) | Method for recovering sodium sulfate and removing potassium chloride ions from alkali ash separation filtrate | |
| CN113620492A (en) | Method for removing TOC in high-salinity water generated by titanium white chloride | |
| RU2347746C2 (en) | Method of producing brine for electrolysis | |
| CN204981419U (en) | Be used for preventing before high ammonia -nitrogen concentration industrial waste water ammonia still process scale deposit pretreatment systems | |
| CN108101075A (en) | A kind of ceramic membrane brine rectification process | |
| CN113772856B (en) | Treatment method for recycling high-salt gold smelting wastewater | |
| CN214936736U (en) | Salt dissolving system for seawater desalination concentrated seawater for chlor-alkali industry | |
| CN217578557U (en) | Selective electrodialysis concentration salt separation recycling system for power plant desulfurization wastewater treatment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |