CN115382503A - Preparation method of special phosphorus removal agent based on modified attapulgite - Google Patents
Preparation method of special phosphorus removal agent based on modified attapulgite Download PDFInfo
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- CN115382503A CN115382503A CN202211113313.9A CN202211113313A CN115382503A CN 115382503 A CN115382503 A CN 115382503A CN 202211113313 A CN202211113313 A CN 202211113313A CN 115382503 A CN115382503 A CN 115382503A
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- 239000011574 phosphorus Substances 0.000 title claims abstract description 67
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 67
- 229960000892 attapulgite Drugs 0.000 title claims abstract description 66
- 229910052625 palygorskite Inorganic materials 0.000 title claims abstract description 66
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000012986 modification Methods 0.000 claims abstract description 24
- 230000004048 modification Effects 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 11
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002351 wastewater Substances 0.000 claims abstract description 9
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 6
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- 239000011790 ferrous sulphate Substances 0.000 claims description 13
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 13
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 13
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 239000002244 precipitate Substances 0.000 claims description 6
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims 2
- 238000001179 sorption measurement Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract description 3
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 abstract description 2
- 239000002689 soil Substances 0.000 abstract 1
- 239000010865 sewage Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920002401 polyacrylamide Polymers 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0207—Compounds of Sc, Y or Lanthanides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0225—Compounds of Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt
- B01J20/0229—Compounds of Fe
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Dispersion Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Removal Of Specific Substances (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a preparation method of a special phosphorus removal agent based on modified attapulgite, which comprises the steps of sequentially carrying out acid modification and high-temperature thermal modification on the attapulgite, carrying out lanthanum nitrate doping modification on the acid-thermally modified raw soil, mixing the acid-thermally-lanthanum modified attapulgite with ferrous iron, sulfuric acid and water, and carrying out oxidation modification on a product by using sodium chlorate to finally obtain the special phosphorus removal agent based on the modified attapulgite. The attapulgite adopted by the invention has wide sources and low price, is suitable for industrial large-scale production, has quite low production cost, and the prepared modified attapulgite has good adsorption performance, the phosphorus removal rate of different high-phosphorus wastewater is over 95 percent, particularly the phosphorus removal rate of wastewater with 5mg/L of raw water total phosphorus reaches 99.6 percent, and the total phosphorus content in the treated wastewater is as low as 0.02mg/L.
Description
Technical Field
The invention belongs to the technical field of water treatment agents, and relates to a preparation method of a special phosphorus removal agent based on modified attapulgite.
Background
With the industrial development of China, the phosphorus pollution of water bodies is very serious, and how to treat the phosphorus pollution of the water bodies becomes an important topic for protecting the water environment of China.
In order to meet the overall requirements of Yangtze river restoration, the problem that the total phosphorus of the water body of the river reach of the Yangtze river basin is seriously overproof is solved. Local standards of total phosphorus emission indexes in various places of Yangtze river basin need to be made to be less than 0.1mg/L (the national standard direct discharge standard is only less than 0.5 mg/L), and aluminum, iron and calcium based phosphorus removal agents in the traditional chemical precipitation method cannot achieve the purpose of further stable phosphorus removal.
Therefore, the research of the special phosphorus removal agent with low cost, high efficiency and high stability is of great significance.
Disclosure of Invention
The invention aims to provide a preparation method of a special phosphorus removing agent based on modified attapulgite, which is simple to operate and has low requirements on equipment; the attapulgite has wide sources and low price, the prepared modified attapulgite phosphorus removal agent has good adsorption performance, and the Total Phosphorus (TP) index of the high-phosphorus wastewater after treatment can be stably reduced to less than 0.1mg/L from less than or equal to 500mg/L of raw water.
The technical scheme adopted by the invention is as follows: a preparation method of a special phosphorus removing agent based on modified attapulgite comprises the following steps:
1) Adding attapulgite into a hydrochloric acid solution for reaction, filtering to obtain a precipitate, washing the precipitate to be neutral, and drying to obtain acid-modified attapulgite;
2) Performing high-temperature thermal modification on the acidified attapulgite to remove chloride ions to prepare acid-thermal modified attapulgite;
3) Taking acid-heat modified attapulgite and a lanthanum nitrate solution for doping modification, and preparing an acid-heat-lanthanum composite modified attapulgite raw material under the condition of full mixing;
4) The prepared composite modified attapulgite raw material is firstly stirred and mixed with ferrous sulfate and water, then concentrated sulfuric acid is added for mixing, and stirring is carried out until the ferrous sulfate is completely dissolved;
5) Adding sodium chlorate, and oxidizing ferrous iron into ferric iron;
6) After the reaction is finished, the special phosphorus removing agent based on the modified attapulgite is finally prepared.
Further, the concentration of the hydrochloric acid solution in the step 1) is 3 to 5mol/L, and the weight ratio of the attapulgite to the water is 1g: adding 2mL of the mixture into a hydrochloric acid solution, stirring and mixing, and then reacting at a constant temperature of 40-60 ℃ for 1-3 hours.
Further, the modification temperature of the high-temperature thermal modification in the step 2) is 680-780 ℃, and the constant temperature time is 2-3h.
Further, the concentration of the lanthanum nitrate solution in the step 3) is 0.1 to 0.5mol/L, and the weight ratio of the attapulgite is as follows: the proportion of lanthanum nitrate is 1g:1ml.
Further, the compound modified attapulgite material in the step 4): water: the mass ratio of the ferrous sulfate is 1: (15 to 25): (45 to 55).
Further, the concentrated sulfuric acid in the step 4) is prepared according to the weight ratio of ferrous iron: concentrated sulfuric acid is 1g: (0.1 to 0.2) ml of the reaction solution.
Further, the mass ratio of the ferrous sulfate to the sodium chlorate in the step 5) is 1: (0.03 to 0.08), and the oxidation reaction time is 30min to 90min.
Further, the professional phosphorus removal agent based on the modified attapulgite prepared in the step 6) is applied to removing the total phosphorus index in the industrial wastewater.
Compared with the prior art, the invention has the following beneficial technical effects:
the attapulgite adopted by the invention is an aqueous magnesium-aluminum-rich silicate clay mineral with a chain lamellar structure, is in a fine rod shape, and has larger specific surface area and more pore channels. In China, the attapulgite is rich in reserves and low in price. Because the attapulgite has the characteristics of large specific surface area, strong adsorption performance, wide source, low cost and the like, the attapulgite has strong selective adsorption on pollutants after acid-heat-lanthanum triple modification, and is particularly suitable for sewage treatment, in particular for removing phosphorus in industrial sewage treatment.
The application method of the professional phosphorus removing agent prepared by the preparation method comprises the steps of adding the product into sewage to be subjected to phosphorus removal according to a certain proportion of total phosphorus pollution amount, stirring and mixing the mixture, and adding PAM (polyacrylamide) for precipitation, wherein the total phosphorus can be reduced to 0.1mg/L for any sewage with the total phosphorus index of less than or equal to 500mg/L after the product is used.
Compared with the existing phosphorus removal agents such as polyaluminium chloride, calcium hydroxide, polyferric sulfate and the like, the phosphorus removal agent has the following advantages:
the attapulgite adopted by the invention has wide sources and low price, the prepared modified attapulgite has good adsorption performance, is suitable for industrial large-scale production, has quite low production cost, and the phosphorus removal rate of different high-phosphorus wastewater is over 95 percent, particularly the phosphorus removal rate of wastewater with 5mg/L of total phosphorus of raw water reaches 99.6 percent, and the Total Phosphorus (TP) index is as low as 0.02mg/L.
Detailed Description
The invention is further illustrated by the following examples.
In the embodiment of the invention, the hydrochloric acid solution, the lanthanum nitrate solution, the ferrous sulfate, the concentrated sulfuric acid, the sodium chlorate and the attapulgite are all commercial products.
Example 1:
the embodiment is a pilot scale production, and the specific process is as follows:
1. weighing 50g of attapulgite, ultrasonically dispersing in a hydrochloric acid solution containing 100mL of 4.5mol/L for 10min, reacting at 50 ℃ for 2h, filtering, washing until the attapulgite is washed to be neutral, and drying for later use.
2. Slowly raising the temperature of the attapulgite after acid modification to 750 ℃, carrying out thermal modification for 2h at constant temperature, and taking out after cooling.
3. Adding the attapulgite subjected to thermal modification into 100mL of 0.2mol/L lanthanum nitrate solution, stirring for 2h for doping modification, filtering and drying to obtain the attapulgite raw material subjected to acid-thermal-lanthanum composite modification of the composite material.
4. Taking 5g of the compositely modified attapulgite, 250g of ferrous sulfate and 100ml of water, and stirring and mixing; then adding 5g of concentrated sulfuric acid, and continuously stirring and mixing until the ferrous sulfate is completely dissolved;
5. then 2.5g of sodium chlorate was added for oxidation for 45min.
6. And obtaining the finished product of the special phosphorous removing agent after the reaction is finished.
Example 2:
this example is a mass production preparation, the specific procedure is as follows:
1. and (3) carrying out 2m cultivation on 4.5mol/L hydrochloric acid solution, adding 1000k of attapulgite, and carrying out stirring reaction for 2h at 50 ℃. After the attapulgite is completely precipitated, washing the precipitate until the precipitate is neutral, and drying to obtain acid-modified attapulgite;
2. slowly raising the temperature of the attapulgite after acid modification to 750 ℃, carrying out thermal modification for 2h at constant temperature, and taking out after cooling.
3. Adding 1m of heat-modified attapulgite into the mixture 3 Stirring the mixture in 0.15mol/L lanthanum nitrate solution for 2h for doping modification, precipitating and drying to obtain the attapulgite raw material subjected to acid-heat-lanthanum composite modification of the composite material.
4. Adding the attapulgite raw material subjected to composite modification into 20m water for carrying out ethanol distillation and mixing; then adding 50t of ferrous sulfate, and continuously stirring and mixing; then 3.5t of concentrated sulfuric acid is added, and the mixture is stirred and mixed until the ferrous sulfate is completely dissolved.
5. Then, 1.25t of sodium chlorate was added thereto and the mixture was stirred continuously to conduct an oxidation reaction for 1 hour.
6. After the reaction is finished, the special phosphorus removing agent based on the modified attapulgite is obtained.
The professional phosphorus removing agent prepared by the embodiment of the invention is used as a sewage phosphorus removing agent, and meanwhile, the TP index of the removed water and the phosphorus removal rate are measured by taking the comparison experiment of the traditional phosphorus removing agent.
Detecting a sample: the total phosphorus of raw water is sewage of 250mg/L, 50mg/L, 15mg/L and 5 mg/L.
Adding amount: the addition amount of each phosphorus removal agent in the same detection sample is the same, wherein the addition amount of 250mg/L of raw water total phosphorus is 3500ppm, the addition amount of 50mg/L of raw water total phosphorus is 1500ppm, the addition amount of 15mg/L of raw water total phosphorus is 150ppm, and the addition amount of 5mg/L of raw water total phosphorus is 150ppm.
And (3) detection process: and adding a phosphorus removing agent into a detection sample as required, stirring for 5min, and adding 100ppm PAM for coagulation. After the treatment, the supernatant was sampled to determine the phosphorus removal rate, and the details are shown in Table 1.
Table 1 comparison of the phosphorus removal effect of the product of the present invention and the conventional phosphorus removal agent.
The special phosphorus removing agent prepared by the embodiment of the invention has the phosphorus removal rate of more than 95% aiming at different high-phosphorus wastewater, particularly the phosphorus removal rate of the wastewater with 5mg/L of the total phosphorus of raw water reaches 99.6%, the Total Phosphorus (TP) index is as low as 0.02mg/L, the removal rate is far greater than the effect of the traditional phosphorus removing agent under the same cost, and the cost is far lower than that of polyaluminium chloride.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (8)
1. A preparation method of a special phosphorus removal agent based on modified attapulgite is characterized by comprising the following steps:
1) Adding attapulgite into a hydrochloric acid solution for reaction, filtering to obtain a precipitate, washing the precipitate to be neutral, and drying to obtain acid-modified attapulgite;
2) Performing high-temperature thermal modification on the acidified attapulgite to remove chloride ions to prepare acid-thermal modified attapulgite;
3) Taking acid-heat modified attapulgite and a lanthanum nitrate solution for doping modification, and preparing an acid-heat-lanthanum composite modified attapulgite raw material under the condition of full mixing;
4) The prepared composite modified attapulgite raw material is firstly stirred and mixed with ferrous sulfate and water, then concentrated sulfuric acid is added for mixing, and stirring is carried out until the ferrous sulfate is completely dissolved;
5) Adding sodium chlorate, and oxidizing ferrous iron into ferric iron;
6) After the reaction is finished, the special phosphorus removing agent based on the modified attapulgite is finally prepared.
2. The preparation method of the special phosphorous removal agent based on the modified attapulgite as claimed in claim 1, wherein the concentration of the hydrochloric acid solution in the step 1) is 3 to 5mol/L, and the attapulgite is prepared by mixing the following components in a proportion of 1g: adding 2mL of the mixture into a hydrochloric acid solution, stirring and mixing, and then reacting at constant temperature of 40 to 60 ℃ for 1 to 3 hours.
3. The preparation method of the special phosphorous removing agent based on the modified attapulgite clay as claimed in claim 1, wherein the modification temperature of the high-temperature thermal modification in the step 2) is 680 to 780 ℃, and the constant temperature time is 2 to 3h.
4. The preparation method of the special phosphorous removing agent based on the modified attapulgite as claimed in claim 1, wherein the concentration of the lanthanum nitrate solution in the step 3) is 0.1 to 0.5mol/L, and the ratio of the attapulgite to the lanthanum nitrate is 1g:1ml.
5. The preparation method of the special phosphorus removing agent based on the modified attapulgite according to claim 1, characterized in that the composite modified attapulgite material in the step 4): water: the mass ratio of the ferrous sulfate is 1: (15 to 25): (45 to 55).
6. The preparation method of the special phosphorus removal agent based on the modified attapulgite as claimed in claim 1, wherein the concentrated sulfuric acid in the step 4) is prepared by mixing ferrous iron: concentrated sulfuric acid is 1g: (0.1 to 0.2) ml of the reaction solution.
7. The preparation method of the special phosphorous removal agent based on the modified attapulgite clay as claimed in claim 1, wherein the mass ratio of the ferrous sulfate to the sodium chlorate in the step 5) is 1: (0.03 to 0.08), and the oxidation reaction time is 30min to 90min.
8. The preparation method of the modified attapulgite-based professional phosphorus removal agent as claimed in any one of claims 1 to 7, wherein the prepared modified attapulgite-based professional phosphorus removal agent is suitable for removing total phosphorus in wastewater.
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| CN103991987A (en) * | 2014-06-09 | 2014-08-20 | 北京碧水源环境工程有限公司 | Process for pre-treating high-concentration phosphorus-containing wastewater to remove total phosphorus (TP) and process system thereof |
| CN104478050A (en) * | 2014-12-01 | 2015-04-01 | 郑州大学 | Preparation method and application of modified polyferric sulfate for treating industrial wastewater |
| CN108483597A (en) * | 2018-03-20 | 2018-09-04 | 深圳市长隆科技有限公司 | A method of preparing solid ferric polysulfate |
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