CN114656064A - Method for removing ferric ions and ferrous ions in ammonium sulfate solution - Google Patents
Method for removing ferric ions and ferrous ions in ammonium sulfate solution Download PDFInfo
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- CN114656064A CN114656064A CN202210370770.XA CN202210370770A CN114656064A CN 114656064 A CN114656064 A CN 114656064A CN 202210370770 A CN202210370770 A CN 202210370770A CN 114656064 A CN114656064 A CN 114656064A
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- ammonium sulfate
- sulfate solution
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- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910052921 ammonium sulfate Inorganic materials 0.000 title claims abstract description 67
- 235000011130 ammonium sulphate Nutrition 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 33
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910001448 ferrous ion Inorganic materials 0.000 title claims abstract description 31
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910001447 ferric ion Inorganic materials 0.000 title claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- 239000000725 suspension Substances 0.000 claims abstract description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 238000001556 precipitation Methods 0.000 claims abstract description 18
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 17
- 239000007800 oxidant agent Substances 0.000 claims abstract description 16
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 13
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 13
- 238000001179 sorption measurement Methods 0.000 claims abstract description 13
- 230000001590 oxidative effect Effects 0.000 claims abstract description 12
- 239000002244 precipitate Substances 0.000 claims abstract description 12
- 239000000243 solution Substances 0.000 claims description 78
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 26
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 47
- 229910052742 iron Inorganic materials 0.000 abstract description 31
- -1 iron ions Chemical class 0.000 abstract description 31
- 230000000694 effects Effects 0.000 abstract description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 7
- 229910021529 ammonia Inorganic materials 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 239000005909 Kieselgur Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000004114 Ammonium polyphosphate Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 235000019826 ammonium polyphosphate Nutrition 0.000 description 1
- 229920001276 ammonium polyphosphate Polymers 0.000 description 1
- SOIFLUNRINLCBN-UHFFFAOYSA-N ammonium thiocyanate Chemical compound [NH4+].[S-]C#N SOIFLUNRINLCBN-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
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
- C02F1/28—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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- 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
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
Abstract
The invention provides a method for removing ferric ions and ferrous ions in an ammonium sulfate solution, which comprises the following steps: mixing an ammonium sulfate solution to be treated with an oxidant to carry out an oxidation reaction to obtain a pretreatment solution; mixing the pretreatment solution with ammonia water for precipitation reaction to obtain a suspension; and adsorbing the precipitate in the suspension by using diatomite. Firstly, mixing ammonium sulfate solution with oxidant, and adding Fe in the ammonium sulfate solution2+Is oxidized into Fe3+Then Fe is mixed with ammonia water3+Conversion to Fe (OH)3Precipitating, and finally adopting diatomite for adsorption, thereby improving the removal effect of iron ions and ferrous ions in the ammonium sulfate solution. Experimental results show that the concentration of iron ions in the ammonium sulfate solution treated by the method provided by the invention is 0.0665mg/L on average.
Description
Technical Field
The invention belongs to the technical field of ammonium sulfate solution purification, and particularly relates to a method for removing iron ions and ferrous ions in an ammonium sulfate solution.
Background
Ammonium sulfate solutions can lead to the presence of ferric and ferrous ion impurities during the manufacturing process. In the process of producing ammonium persulfate by electrolyzing ammonium sulfate solution, in the anode reaction, in addition to main reaction, there is side reaction of oxygen evolution, namely 2H2O→O2+4H++4e, the reaction is the main cause of reduced current efficiency. In order to inhibit the reaction, an oxygen evolution inhibitor should be added in addition to the anode with high oxygen evolution overpotential. Fruit of Chinese wolfberryThe addition of additives is proved to be very necessary by the practice. In principle, the additive only affects the kinetics of oxygen generation and not SO4 2-(or HSO)4 -) The discharge dynamics reduce the oxygen evolution speed, which is beneficial to SO4 2-(or HSO)4 -) The ion discharge process is performed. Common additives are urea, MH4SCN, ammonium polyphosphate and the like, and the addition amount is about 0.1 percent. In actual production, the ammonium thiocyanate is used with the best effect, but because of SCN-Ions with Fe3+The reaction of the ions is very sensitive, and can cause certain influence on the quality of the product. From the principle of chemical reaction, SCN-The ions can be oxidized to CN-Ionic, environmental pollution, and Fe2+The ions are very easy to oxidize into Fe3+. Therefore, it is essential to effectively remove the ferric and ferrous ions from the ammonium sulfate solution prior to electrolysis.
At present, the iron ions and ferrous ions in the ammonium sulfate are removed by a repeated recrystallization method, and the method has poor effect of removing the iron ions and the ferrous ions. Therefore, how to improve the removal effect of iron ions and ferrous ions in ammonium sulfate becomes a difficult problem to be solved in the field.
Disclosure of Invention
The invention aims to provide a method for removing iron ions and ferrous ions in an ammonium sulfate solution. The method provided by the invention can well remove ferric ions and ferrous ions in the ammonium sulfate solution.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for removing iron ions and ferrous ions in an ammonium sulfate solution, which comprises the following steps:
(1) mixing an ammonium sulfate solution to be treated with an oxidant for oxidation reaction to obtain a pretreatment solution;
(2) mixing the pretreatment solution obtained in the step (1) with ammonia water for precipitation reaction to obtain a suspension;
(3) adsorbing the precipitate in the suspension obtained in the step (2) by using diatomite.
Preferably, the oxidizing agent in step (1) is an aqueous solution of hydrogen peroxide.
Preferably, the mass concentration of the aqueous solution of hydrogen peroxide is 25-35%.
Preferably, the volume ratio of the hydrogen peroxide to the ammonium sulfate solution to be treated is (1-2): 1000.
preferably, the volume ratio of the hydrogen peroxide to the ammonium sulfate solution to be treated is (1-1.5): 1000.
preferably, the pH value of the precipitation reaction in the step (2) is 8-9.
Preferably, the mass ratio of the diatomite to the suspension in the step (3) is (50-60) g: 1L of the compound.
Preferably, the mass ratio of the diatomite to the volume ratio of the suspension is (50-55) g: 1L of the compound.
Preferably, the adsorption time in the step (3) is 2-3 h.
Preferably, the adsorption time is 2-2.5 h.
The invention provides a method for removing iron ions and ferrous ions in an ammonium sulfate solution, which comprises the following steps: mixing an ammonium sulfate solution to be treated with an oxidant for oxidation reaction to obtain a pretreatment solution; mixing the pretreatment solution with ammonia water for precipitation reaction to obtain a suspension; and adsorbing the precipitate in the suspension by using diatomite. Firstly, mixing ammonium sulfate solution with oxidant, and adding Fe in the ammonium sulfate solution2+Is oxidized into Fe3+Then Fe is mixed with ammonia water3+Conversion to Fe (OH)3Precipitating, and finally adopting diatomite for adsorption, thereby improving the removal effect of iron ions and ferrous ions in the ammonium sulfate solution. Experimental results show that the concentration of iron ions in the ammonium sulfate solution treated by the method provided by the invention is 0.0665mg/L on average.
Detailed Description
The invention provides a method for removing iron ions and ferrous ions in an ammonium sulfate solution, which comprises the following steps:
(1) mixing an ammonium sulfate solution to be treated with an oxidant for oxidation reaction to obtain a pretreatment solution;
(2) mixing the pretreatment solution obtained in the step (1) with ammonia water for precipitation reaction to obtain a suspension;
(3) and (3) adsorbing the precipitate in the suspension obtained in the step (2) by using diatomite.
The method mixes the ammonium sulfate solution to be treated with an oxidant for oxidation reaction to obtain a pretreatment solution. The invention mixes the ammonium sulfate solution to be treated with the oxidant for oxidation reaction, and can react Fe in the ammonium sulfate solution2+Is oxidized into Fe3 +。
In the present invention, the mass fraction of ferrous ions in the ammonium sulfate solution to be treated is preferably not higher than 0.005%; the mass fraction of iron ions in the ammonium sulfate solution to be treated is preferably not higher than 0.005%. The source of the ammonium sulfate solution to be treated is not particularly limited in the present invention, and the ammonium sulfate solution can be prepared by a preparation method well known to those skilled in the art.
In the present invention, the oxidizing agent is preferably an aqueous solution of hydrogen peroxide; the mass concentration of the aqueous solution of hydrogen peroxide is preferably 25-35%, and more preferably 30%; the volume ratio of the hydrogen peroxide to the ammonium sulfate solution to be treated is preferably (1-2): 1000, more preferably (1 to 1.5): 1000. the source of the oxidizing agent is not particularly limited in the present invention, and it may be formulated by a commercially available product or a well-known formulation method known to those skilled in the art. In the invention, the oxidant can oxidize ferrous ions in the ammonium sulfate solution to be treated into ferric ions, thereby being beneficial to subsequent removal.
The operation of mixing the ammonium sulfate solution to be treated and the oxidant is not particularly limited in the invention, and the technical scheme for preparing the mixed material, which is well known to those skilled in the art, can be adopted.
In the present invention, the temperature of the oxidation reaction is preferably room temperature; the time of the oxidation reaction is preferably 2-3 h. The invention is beneficial to completely oxidize ferrous ions into ferric ions by controlling the temperature and time of the oxidation reaction.
After the pretreatment solution is obtained, the invention uses the pretreatment solutionMixing with ammonia water for precipitation reaction to obtain suspension. The invention adopts ammonia water to react Fe3+Conversion to Fe (OH)3Precipitating to remove iron ions in the ammonium sulfate solution.
The source of the aqueous ammonia in the present invention is not particularly limited, and commercially available products known to those skilled in the art may be used. The dosage of the ammonia water is not specially limited, and the pH of the pretreatment solution is adjusted to be within the range of 8-9. The method adopts the ammonia water, so that the influence on the purity of the ammonium sulfate caused by the introduction of other impurities can be avoided.
The operation of mixing the pretreatment solution and the ammonia water is not particularly limited in the invention, and the technical scheme for preparing the mixed material, which is well known to the technical personnel in the field, can be adopted.
In the invention, the pH value of the precipitation reaction is preferably 8-9. The temperature of the precipitation reaction is not particularly limited, and the precipitation reaction may be carried out at room temperature. The time of the precipitation reaction is not particularly limited in the present invention until no precipitate is formed. The invention can completely convert iron ions into Fe (OH) by controlling the pH value of the mixed solution during the precipitation reaction3Precipitation, which facilitates the removal of iron.
After the suspension is obtained, the diatomite is adopted to adsorb the precipitate in the suspension. The diatomite can adsorb Fe (OH) in suspension3Precipitating to remove iron ions in the ammonium sulfate solution.
In the present invention, the diatomaceous earth is preferably analytically pure diatomaceous earth. The source of the diatomaceous earth is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used.
In the present invention, the ratio of the mass of the diatomaceous earth to the volume of the suspension is preferably (50 to 60) g: 1L, more preferably (50-55) g: 1L of the compound. The invention can further improve Fe (OH) by controlling the mass ratio of the diatomite to the volume ratio of the suspension3The removal rate of the precipitate is improved, thereby further improving the removal effect of iron ions in the ammonium sulfate solution.
In the invention, the adsorption time is preferably 2-3 h, and more preferably 2-2.5 h. In the present invention, the temperature of the adsorption is not particularly limited, and the adsorption may be carried out at room temperature.
After the adsorption is finished, the product obtained by the adsorption is filtered. The invention can realize the separation of the diatomite and the ammonium sulfate solution by adopting filtration.
The operation of the filtration is not particularly limited in the present invention, and a filtration operation known to those skilled in the art may be employed.
Firstly, mixing ammonium sulfate solution with oxidant, and adding Fe in the ammonium sulfate solution2+Total oxidation to Fe3+Then Fe is mixed with ammonia water3+Conversion to Fe (OH)3Precipitating, and finally carrying out physical adsorption by adopting diatomite, thereby improving the removal effect of iron ions and ferrous ions in the ammonium sulfate solution.
The method provided by the invention realizes the purification of the ammonium sulfate solution, thereby improving the efficiency of electrolyzing the ammonium sulfate.
The method provided by the invention is suitable for saturated ammonium sulfate solution and unsaturated ammonium sulfate solution, and is also suitable for removing iron ions in potassium sulfate solution and sodium sulfate solution.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The method for removing the iron ions and the ferrous ions in the ammonium sulfate solution comprises the following steps:
(1) mixing 10L of 490g/L industrial-grade ammonium sulfate solution (Ji Hei Wei Wu Co., Ltd.) with 10mL of 25% hydrogen peroxide aqueous solution for oxidation reaction to obtain a pretreatment solution; wherein the temperature of the oxidation reaction is room temperature; the time of the oxidation reaction is 2 hours; the sum of the concentration of ferrous ions and iron ions in the ammonium sulfate solution is 0.497 mg/L;
(2) mixing the pretreatment solution obtained in the step (1) with ammonia water for precipitation reaction until no precipitate is generated, so as to obtain a suspension; wherein the pH value of the precipitation reaction is 8;
(3) and (3) adsorbing the precipitate in the suspension obtained in the step (2) for 2 hours by using 500g of analytically pure diatomite, and filtering to obtain an ammonium sulfate solution with iron ions and ferrous ions removed.
Comparative example 1
The method for removing the ferric ions and the ferrous ions in the ammonium sulfate solution comprises the following steps:
(1) mixing 10L of 490g/L industrial-grade ammonium sulfate solution (Ji Hei Wei Wu Co., Ltd.) with 10mL of 25% hydrogen peroxide aqueous solution for oxidation reaction to obtain a pretreatment solution; wherein the temperature of the oxidation reaction is room temperature; the time of the oxidation reaction is 2 h; the sum of the concentration of ferrous ions and iron ions in the ammonium sulfate solution is 0.497 mg/L;
(2) mixing the pretreatment solution obtained in the step (1) with ammonia water for precipitation reaction until no precipitate is generated to obtain a suspension; wherein the pH value during the precipitation reaction is 8;
(3) and (3) adsorbing the precipitate in the suspension obtained in the step (2) for 2 hours by using 500g of activated carbon, and filtering to obtain an ammonium sulfate solution with iron ions and ferrous ions removed.
The concentrations of iron ions and ferrous ions in the treated ammonium sulfate solutions prepared in example 1 and comparative example 1 were measured four times using a plasma emission spectrometer PerkinElmer 8300, wherein the ferrous ion concentration was 0 and the results of the concentrations of iron ions are shown in table 1.
Table 1 concentration of iron ions in treated ammonium sulfate solutions prepared in example 1 and comparative example 1
| Comparative example 1 | Example 1 |
| 0.151mg/L | 0.066mg/L |
| 0.152mg/L | 0.065mg/L |
| 0.155mg/L | 0.067mg/L |
| 0.156mg/L | 0.068mg/L |
As can be seen from Table 1, the average concentration of iron ions in the ammonium sulfate solution treated with activated carbon was 0.153mg/L, and the average concentration of iron ions in the ammonium sulfate solution treated with diatomaceous earth was 0.0665mg/L, indicating that diatomaceous earth has better adsorption capacity than activated carbon and can better purify the ammonium sulfate solution.
It can be seen from table 1 that the preparation method provided by the invention can remove iron ions and ferrous ions in the ammonium sulfate solution, and has a good removal effect.
As can be seen from the above examples and comparative examples, the method provided by the invention can well remove ferric ions and ferrous ions in the ammonium sulfate solution.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for removing ferric ions and ferrous ions in an ammonium sulfate solution comprises the following steps:
(1) mixing an ammonium sulfate solution to be treated with an oxidant for oxidation reaction to obtain a pretreatment solution;
(2) mixing the pretreatment solution obtained in the step (1) with ammonia water for precipitation reaction to obtain a suspension;
(3) and (3) adsorbing the precipitate in the suspension obtained in the step (2) by using diatomite.
2. The method according to claim 1, wherein the oxidizing agent in step (1) is an aqueous solution of hydrogen peroxide.
3. The method according to claim 2, wherein the aqueous solution of hydrogen peroxide has a mass concentration of 25 to 35%.
4. A method as claimed in claim 3, wherein the volume ratio of hydrogen peroxide to ammonium sulphate solution to be treated is (1-2): 1000.
5. the method according to claim 4, wherein the volume ratio of the hydrogen peroxide to the ammonium sulfate solution to be treated is (1-1.5): 1000.
6. the method according to claim 1, wherein the precipitation reaction in step (2) has a pH of 8 to 9.
7. The method according to claim 1, wherein the ratio of the mass of the diatomite to the volume of the suspension in the step (3) is (50-60) g: 1L of the compound.
8. The method according to claim 7, wherein the ratio of the mass of the diatomite to the volume of the suspension is (50-55) g: 1L of the compound.
9. The method according to claim 1, wherein the adsorption time in the step (3) is 2-3 h.
10. The method according to claim 9, wherein the adsorption time is 2-2.5 h.
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