CN115771991A - Polymeric aluminum ferric silicate sludge conditioner and preparation method thereof - Google Patents
Polymeric aluminum ferric silicate sludge conditioner and preparation method thereof Download PDFInfo
- Publication number
- CN115771991A CN115771991A CN202211596549.2A CN202211596549A CN115771991A CN 115771991 A CN115771991 A CN 115771991A CN 202211596549 A CN202211596549 A CN 202211596549A CN 115771991 A CN115771991 A CN 115771991A
- Authority
- CN
- China
- Prior art keywords
- silicate
- aluminum
- rust
- preparation
- sulfuric acid
- 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.)
- Pending
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 33
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 20
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 20
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 7
- 238000005303 weighing Methods 0.000 claims abstract description 7
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims abstract description 6
- PHIQPXBZDGYJOG-UHFFFAOYSA-N sodium silicate nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-][Si]([O-])=O PHIQPXBZDGYJOG-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000001354 calcination Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 239000011734 sodium Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000032683 aging Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
- 235000019795 sodium metasilicate Nutrition 0.000 abstract description 5
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 239000000701 coagulant Substances 0.000 abstract description 2
- 230000001143 conditioned effect Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 230000007062 hydrolysis Effects 0.000 abstract description 2
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 2
- 150000002505 iron Chemical class 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 20
- 239000000523 sample Substances 0.000 description 7
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical class Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012496 blank sample Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Abstract
The invention discloses a polymeric aluminum ferric silicate sludge conditioner and a preparation method thereof. In the invention, sodium metasilicate nonahydrate Na 2 SiO 3 ·9H 2 Dissolving O in pure water, slowly adding a sulfuric acid solution into the pure water, converting a sodium silicate solution from a liquid state to a colloidal state to a liquid state, calcining the rust for 1 hour in a muffle furnace at 800 ℃, taking out the rust for cooling, weighing calcined rust powder, dissolving the calcined rust powder in the sulfuric acid solution, and removing impurities; sodium metasilicate is used as a coagulant aid and a carrier, the advantages and the defects of floccules generated by hydrolysis of iron salt and aluminum salt are balanced, and the polymeric aluminum ferric silicate is prepared by utilizing the cavitation effect of the ultrasonic cell disruptor, so that the synergistic effect is generated among the sodium metasilicate, the iron rust and the aluminum sulfate. The invention utilizes the resource attribute of the iron rust, the raw materials are low in price and easy to obtain, the preparation method is simple and harmless, simultaneously the polymerized aluminum silicate iron has stable performance and obvious dewatering effect advantage, the moisture content of the conditioned mud cake is less than 60 percent, the high efficiency and the convenience in use are improved, and the method can be applied to industrialization.
Description
Technical Field
The invention belongs to the technical field of sludge conditioners, and particularly relates to a polymeric aluminum ferric silicate sludge conditioner and a preparation method thereof.
Background
The high water content and difficult dehydration property of municipal sludge become a big problem for limiting the sludge treatment disposal. The application of the sludge conditioner can obviously reduce the specific resistance of the sludge and greatly improve the dehydration performance of the sludge. Sludge conditioners in the current market mainly comprise two major types, namely organic conditioners and inorganic conditioners. The organic conditioner mainly comprises polyacrylamide, and the organic conditioner has relatively low market share due to high raw material cost. The inorganic conditioner mainly comprises lime, polyaluminium chloride, polyferric sulfate and the like. Due to the fact that the addition amount of lime is too large, the amount of treated mud cakes is remarkably increased, chloride ions in ferric chloride salt or aluminum salt can corrode metal, and the risk of generating dioxin is increased due to the fact that the sludge conditioned by the ferric chloride salt or the aluminum salt is subjected to heat treatment.
Disclosure of Invention
The invention aims to: in order to solve the problems, the polymeric aluminum ferric silicate sludge conditioner and the preparation method thereof are provided.
The technical scheme adopted by the invention is as follows: a polymeric ferric aluminum silicate sludge conditioner and a preparation method thereof are disclosed, wherein the polymeric ferric aluminum silicate sludge conditioner and the preparation method thereof comprise the following steps:
s1, adding sodium metasilicate nonahydrate Na 2 SiO 3 ·9H 2 Dissolving O in pure water, slowly adding a sulfuric acid solution into the pure water, and converting the sodium silicate solution from a liquid state to a colloidal state and then to a liquid state;
s2, placing the rust in a muffle furnace at 800 ℃ for calcining for 1h, taking out and cooling, weighing calcined rust powder, dissolving the calcined rust powder in a sulfuric acid solution, and removing impurities;
s3, mixing the sodium silicate solution obtained in the step S1 and the iron rust solution obtained in the step S2 uniformly, weighing aluminum sulfate to dissolve the aluminum sulfate in the sodium silicate solution, and controlling m (Si): m (Fe): m (Al) ≈ 1:3:1;
s4, homogenizing for 15 minutes by using an ultrasonic cell disruptor, taking out, placing in a constant-temperature water bath kettle, heating at 70 ℃, and stirring for 2 hours;
and S5, aging the polymerized aluminum ferric silicate mixed liquid prepared in the step S4 for 24 hours to obtain the polymerized aluminum ferric silicate sludge conditioner.
In a preferred embodiment, in the step S1, a sulfuric acid solution is slowly added thereto until the pH of the sodium silicate mixed liquor =2.
In a preferred embodiment, in said step S3, a sulfuric acid solution is added to adjust the pH to 2.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
in the invention, sodium metasilicate is used as a coagulant aid and a carrier, the advantages and the defects of floccules generated by hydrolysis of iron salt and aluminum salt are balanced, and the polymeric aluminum ferric silicate is prepared by utilizing the cavitation effect of the ultrasonic cell disruptor, so that the synergistic effect is generated among the sodium metasilicate, the iron rust and the aluminum sulfate. The invention utilizes the resource attribute of the rust, the raw materials are cheap and easy to obtain, the preparation method is simple and harmless, simultaneously the polymerized aluminum silicate iron has stable performance, compact structure, good settling property and obvious dewatering effect advantage, the water content of the mud cake after conditioning is less than 60 percent, the high efficiency and the convenience when in use are improved, and the invention can be applied industrially.
Drawings
FIG. 1 is an SEM image of polymerized aluminum ferric silicate of the present invention magnified 500 times;
FIG. 2 is an SEM image of polymeric aluminum ferric silicate of the present invention magnified 3000 times
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Example 1:
the method comprises the following steps: 25.36g of sodium metasilicate nonahydrate Na are weighed 2 SiO 3 ·9H 2 Dissolving O in 100mL of pure water, slowly adding a sulfuric acid solution with the concentration of 20%, and converting the sodium silicate solution from a liquid state to a colloidal state again until the pH of the sodium silicate mixed solution is =2;
step two: placing the rust in a muffle furnace at 800 ℃ for calcining for 1h, taking out and cooling, weighing 13g of calcined rust powder, dissolving in 90mL of 20% sulfuric acid solution, and removing impurities;
step three: uniformly mixing the sodium silicate solution in the step one and the iron rust solution in the step two, weighing 15.83g of aluminum sulfate to be dissolved in the sodium silicate solution, wherein m (Si): m (Fe): m (Al) ≈ 1:3:1, adding a sulfuric acid solution with the concentration of 20% to adjust the pH value to 2;
step four: homogenizing with ultrasonic cell disruptor for 15 min, taking out, and heating and stirring at 70 deg.C for 2 hr.
And sealing and aging the polymeric aluminum ferric silicate mixed liquid plastic container for 24 hours to obtain the polymeric aluminum ferric silicate sludge conditioner.
Example 2:
150g of fresh municipal sludge 6 parts are weighed and respectively placed in beakers, 240mL of pure water is added, the numbers are respectively 1, 2, 3, 4, 5 and 6, and the water content of the municipal sludge is 95%. 10, 12, 14, 16, 18 and 0mL of the polymeric aluminum ferric silicate prepared in example 1 were added to 6 beakers, respectively, and placed in a fully automatic stirrer at 500r/min for rapid stirring for 10min, followed by 100r/min for slow stirring for 30min. And (3) recording the CST value of the sludge by adopting a capillary absorption time tester, stabilizing and filter-pressing for five minutes by adopting a filter press at 1Mpa, and testing the water content of the sludge cake.
| Sample numbering | CST value/s | Water content of mud cake/%) |
| 1 | 25.00 | 62.91 |
| 2 | 24.53 | 59.34 |
| 3 | 25.57 | 62.23 |
| 4 | 26.37 | 64.18 |
| 5 | 26.20 | 64.75 |
| 6 | 52.33 | 66.60 |
The results show that: with the increase of the addition amount of the polyaluminum ferric silicate, the CST value and the mud cake water content of the regulated municipal sludge show the trend of increasing after decreasing, the CST value and the mud cake water content of the municipal sludge added with 12mL of the polyaluminum ferric silicate are the lowest, and the polyaluminum ferric silicate has stronger dehydration performance compared with the blank sample No. 6.
Example 3:
150g of fresh municipal sludge 3 parts are weighed and respectively placed in a beaker, 240mL of pure water is added, the numbers are 1, 2 and 3 respectively, and the water content of the municipal sludge is 95%. To sample No. 1 was added 12mL of the polyaluminum ferric aluminosilicate of example 2, which was the optimum amount. Sample No. 2 was charged with 1.35g of sodium metasilicate nonahydrate, 0.69g of rust and 0.84g of aluminum sulfate, and 12mL of pure water was added. (since 12mL of polyaluminum ferric silicate theoretically contains 1.35g of sodium silicate, 0.69g of rust, and 0.84g of aluminum sulfate). 12mL of purified water was added to sample No. 3. Placing in a full-automatic stirrer for fast stirring at 500r/min for 10min, and then slowly stirring at 100r/min for 30min. And recording the CST value of the sludge by adopting a capillary absorption time determinator, stably performing filter pressing for five minutes by adopting a filter press under 1Mpa, and determining the water content of the sludge cake.
| Sample numbering | CST value/s | Water content of mud cake/%) |
| 1 | 26.33 | 59.53 |
| 2 | 36.57 | 63.03 |
| 3 | 54.33 | 66.57 |
The results show that: the CST value of the sample No. 1 and the water content of the mud cake are lower than those of the sample No. 2, which shows that the synergistic effect is generated among sodium metasilicate, iron rust and aluminum sulfate through the polymerization reaction, and the performance of the generated polymeric aluminum ferric silicate on sludge dehydration is better than the direct conditioning effect of the sodium silicate, the iron rust and the aluminum sulfate.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A polymeric aluminum ferric silicate sludge conditioner and a preparation method thereof are characterized in that: the polymeric aluminum ferric silicate sludge conditioner and the preparation method thereof comprise the following steps:
s1, adding sodium metasilicate nonahydrate Na 2 SiO 3 ·9H 2 Dissolving O in pure water, slowly adding a sulfuric acid solution into the pure water, and converting the sodium silicate solution from a liquid state to a colloidal state and then to a liquid state;
s2, placing the rust in a muffle furnace at 800 ℃ for calcining for 1h, taking out and cooling, weighing calcined rust powder, dissolving the calcined rust powder in a sulfuric acid solution, and removing impurities;
s3, uniformly mixing the sodium silicate solution obtained in the step S1 and the iron rust solution obtained in the step S2, weighing aluminum sulfate and dissolving the aluminum sulfate in the sodium silicate solution, and controlling m (Si): m (Fe): m (Al) ≈ 1:3:1;
s4, homogenizing for 15 minutes by using an ultrasonic cell disruption instrument, taking out, placing in a constant-temperature water bath kettle, heating at 70 ℃, and stirring for 2 hours;
and S5, aging the polymerized aluminum ferric silicate mixed liquid prepared in the step S4 for 24 hours to obtain the polymerized aluminum ferric silicate sludge conditioner.
2. The polymeric ferric aluminum silicate sludge conditioner and the preparation method thereof as claimed in claim 1, wherein: in the step S1, a sulfuric acid solution is slowly added thereto until the pH of the sodium silicate mixed liquor =2.
3. The polymeric ferric aluminum silicate sludge conditioner and the preparation method thereof as claimed in claim 1, wherein: in said step S3, a sulfuric acid solution is added to adjust the pH to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211596549.2A CN115771991A (en) | 2022-12-12 | 2022-12-12 | Polymeric aluminum ferric silicate sludge conditioner and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211596549.2A CN115771991A (en) | 2022-12-12 | 2022-12-12 | Polymeric aluminum ferric silicate sludge conditioner and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115771991A true CN115771991A (en) | 2023-03-10 |
Family
ID=85392071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211596549.2A Pending CN115771991A (en) | 2022-12-12 | 2022-12-12 | Polymeric aluminum ferric silicate sludge conditioner and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115771991A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786634A (en) * | 2009-01-23 | 2010-07-28 | 新疆大学 | Synthesis method of stable zinc polysilicate flocculant |
| CN103626274A (en) * | 2013-12-21 | 2014-03-12 | 蚌埠学院 | Method for preparing flocculating agent |
| WO2018032810A1 (en) * | 2016-08-16 | 2018-02-22 | 中电建水环境治理技术有限公司 | Composite material for treating, conditioning, and remediating contaminated river or lake sediment, and manufacturing method thereof |
| CN111517619A (en) * | 2020-05-15 | 2020-08-11 | 同臣环保装备科技(苏州)有限公司 | Polysilicate magnesium ferric sulfate conditioner and preparation method thereof |
| CN112354516A (en) * | 2020-10-26 | 2021-02-12 | 哈尔滨工业大学 | Method for preparing magnetic sludge-based biochar material from sludge and application of magnetic sludge-based biochar material |
-
2022
- 2022-12-12 CN CN202211596549.2A patent/CN115771991A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786634A (en) * | 2009-01-23 | 2010-07-28 | 新疆大学 | Synthesis method of stable zinc polysilicate flocculant |
| CN103626274A (en) * | 2013-12-21 | 2014-03-12 | 蚌埠学院 | Method for preparing flocculating agent |
| WO2018032810A1 (en) * | 2016-08-16 | 2018-02-22 | 中电建水环境治理技术有限公司 | Composite material for treating, conditioning, and remediating contaminated river or lake sediment, and manufacturing method thereof |
| CN111517619A (en) * | 2020-05-15 | 2020-08-11 | 同臣环保装备科技(苏州)有限公司 | Polysilicate magnesium ferric sulfate conditioner and preparation method thereof |
| CN112354516A (en) * | 2020-10-26 | 2021-02-12 | 哈尔滨工业大学 | Method for preparing magnetic sludge-based biochar material from sludge and application of magnetic sludge-based biochar material |
Non-Patent Citations (2)
| Title |
|---|
| 杨慧等: "聚合硅酸铝铁的制备及性能研究", 广东化工 * |
| 石文杰: "无机絮凝剂聚合硅酸铝铁的制备", 中国石油石化 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100542975C (en) | A kind of preparation method of polymeric ferric boron silicate aluminium magnesium flocculating agent | |
| CN101003390A (en) | Method for preparing flocculant of ferric chloride of polysilicon acid | |
| CN103342406B (en) | Polymeric silicic acid-polyferric sulfate titanium inorganic macromolecular composite flocculant and preparation method and application thereof | |
| CN108585146B (en) | Preparation method of titanium-containing composite ferric polysulfate flocculant | |
| CN106335991A (en) | Preparation method of composite polymeric ferric silicate-sulfate macromolecular flocculant | |
| CN111453826A (en) | Micro-nano porous polyaluminium coagulant aid and preparation method and application thereof | |
| CN110813264A (en) | Lanthanum modified material of hydrated calcium silicate gel and preparation method thereof | |
| KR101478305B1 (en) | Inorganic coagulant for treating waste-water and preparation method of the same | |
| CN101279755A (en) | Preparation of calcium type polyaluminium chloride purificant | |
| CN102689906B (en) | Method for preparing polysilicate aluminum ferric chloride by using aluminum foil acid and ferrous acid | |
| CN111606401A (en) | Preparation method of high-purity polyaluminum chloride from water treatment inorganic flocculant | |
| CN109628751A (en) | A method of silicon in removing zinc oxide fumes leaching process | |
| CN109928475A (en) | A kind of composite water purifying agent and its preparation method and application | |
| CN115771991A (en) | Polymeric aluminum ferric silicate sludge conditioner and preparation method thereof | |
| CN111439767A (en) | Efficient preparation method for preparing aluminum sulfate by using waste | |
| CN110835153A (en) | Improved defluorinating agent | |
| JP5072780B2 (en) | Fluorine waste water treatment method using titanium oxide and metatitanic acid | |
| CN109250795B (en) | Method for rapidly preparing poly-silicate aluminum ferric sulfate by one-pot microwave radiation method | |
| CN111302463A (en) | Polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater and preparation method thereof | |
| CN115716697A (en) | Preparation method of low-chlorination external-drainage recycled circulating water | |
| CN1105686C (en) | Low-aluminium water purifying agent and its production process | |
| CN112159019A (en) | Treatment method of high-salt high-COD wastewater | |
| CN111302600A (en) | Conditioner for improving dewatering performance of sludge in water supply plant and preparation method and application thereof | |
| CN112408662A (en) | Method for treating desulfurization wastewater of thermal power plant by virtue of single-multivalent separation electrodialysis | |
| CN104353408A (en) | Preparation method for modified porous SiO2 |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20230310 |