CN113697860A - Green preparation method of potassium ferrate - Google Patents
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- CN113697860A CN113697860A CN202111001648.7A CN202111001648A CN113697860A CN 113697860 A CN113697860 A CN 113697860A CN 202111001648 A CN202111001648 A CN 202111001648A CN 113697860 A CN113697860 A CN 113697860A
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- UMPKMCDVBZFQOK-UHFFFAOYSA-N potassium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[K+].[Fe+3] UMPKMCDVBZFQOK-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 75
- 239000011734 sodium Substances 0.000 claims abstract description 51
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 50
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 50
- 239000000243 solution Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 25
- 230000003647 oxidation Effects 0.000 claims abstract description 14
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 14
- 239000005457 ice water Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000007787 solid Substances 0.000 claims abstract description 8
- SZQUEWJRBJDHSM-UHFFFAOYSA-N iron(3+);trinitrate;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O SZQUEWJRBJDHSM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012047 saturated solution Substances 0.000 claims abstract description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- QZRHHEURPZONJU-UHFFFAOYSA-N iron(2+) dinitrate nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O QZRHHEURPZONJU-UHFFFAOYSA-N 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 abstract description 8
- 239000000460 chlorine Substances 0.000 abstract description 6
- 238000009279 wet oxidation reaction Methods 0.000 abstract description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052801 chlorine Inorganic materials 0.000 abstract description 3
- 238000000354 decomposition reaction Methods 0.000 abstract description 3
- 239000007864 aqueous solution Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910001868 water Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000005708 Sodium hypochlorite Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 235000013980 iron oxide Nutrition 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- -1 Mn and the like Chemical class 0.000 description 1
- 229910021311 NaFeO2 Inorganic materials 0.000 description 1
- 150000004973 alkali metal peroxides Chemical class 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/14—Alkali metal compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
- C01P2002/82—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by IR- or Raman-data
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Compounds Of Iron (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
本申请公开一种高铁酸钾的绿色制备方法，包括以下步骤：（1）制备中间体铁酸钠：将九水合硝酸铁溶于氢氧化钠去离子水溶液中，形成预混料，将预混料和3‑6mol/L的氢氧化钠溶液分别预热，然后混合，通入预热的压缩空气，搅拌，在220‑300℃下反应1‑4小时，冷却，分离沉降，得到的液体为铁酸钠溶液；（2）电解氧化法制备高铁酸钠；（3）制备高铁酸钾：在冰水浴条件下，向高铁酸钠溶液中加入KOH饱和溶液，析出紫黑色固体，过滤、干燥。本发明通过制备中间体铁酸钠，有效规避了现有技术湿式氧化法制备高铁酸钾时氯气(Cl2)和次氯酸盐(ClO‑)的使用，同时规避高铁酸钾在高温下的分解，为一种绿色制备方法。
The present application discloses a green preparation method of potassium ferrate, comprising the following steps: (1) preparing the intermediate sodium ferrate: dissolving ferric nitrate nonahydrate in a deionized sodium hydroxide aqueous solution to form a premix, The material and the sodium hydroxide solution of 3-6mol/L were preheated respectively, then mixed, fed with preheated compressed air, stirred, reacted at 220-300 ℃ for 1-4 hours, cooled, separated and settled, and the obtained liquid was Sodium ferrate solution; (2) Electrolytic oxidation to prepare sodium ferrate; (3) Preparation of potassium ferrate: Add KOH saturated solution to the sodium ferrate solution under ice-water bath conditions, and a purple-black solid is precipitated, filtered and dried. By preparing the intermediate sodium ferrate, the present invention effectively avoids the use of chlorine (Cl 2 ) and hypochlorite (ClO ) when the prior art wet oxidation method prepares potassium ferrate, and simultaneously avoids the use of potassium ferrate at high temperatures. Decomposition, as a green preparation method.
Description
Technical Field
The invention belongs to the technical field of preparation of chemical water treatment agents, and particularly relates to a green preparation method of potassium ferrate.
Background
Potassium ferrate has strong oxidizing property (E)FeO4 2- /Fe 3+= 2.20V), selectivity and environmentally friendly properties. People find that the potassium ferrate can be used as a high-efficiency and nontoxic environment-friendly multifunctional water treatment agent; the potassium ferrate has good selectivity and can be used for organic synthesis; in addition, potassium ferrate can also be used as an electrode material for high-energy "super-iron" batteries. Therefore, the potassium ferrate has good application prospect in the fields.
At present, the preparation method of potassium ferrate mainly comprises three methods: wet oxidation, electrolytic oxidation, and dry oxidation.
Dry oxidation (also called high-temperature melt oxidation): the alkali metal peroxide and ferric salt or iron oxide are melted and reacted according to a certain proportion under the condition of high temperature and high pressure to generate the potassium ferrate. The peroxide has strong oxidizability, has high requirements on reaction equipment, generates high temperature during reaction, is difficult to control and is difficult to be used practically.
Wet oxidation (also known as hypochlorite oxidation): the principle of the method is that sodium hypochlorite and ferric nitrate are added into a strong alkaline solution, ferric iron is oxidized into ferrous ferrate ions by the sodium hypochlorite to generate sodium ferrate, chlorine gas needs to be introduced in the preparation process, and a reaction container is easy to corrode; the generated ferrate is easily decomposed into iron oxides with different valence states under the catalytic action of metals such as Mn and the like, so that the yield of the ferrate is reduced.
Electrolytic oxidation method: the method is characterized in that an iron substance anode is used for generating sodium ferrate through anode-iron electrode reaction in an electrolyte of high-concentration NaOH, KOH is added to generate potassium ferrate precipitate, and solid-liquid separation, organic washing and vacuum drying are carried out to generate solid potassium ferrate. Compared with other two methods, the electrolytic oxidation method has the advantages of low raw material consumption and convenient operation. But has high requirements on the materials of the electrolytic cell and other accessories, and the anode electrode is easy to passivate, so that the reaction yield is low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention providesThe green preparation method of potassium ferrate can effectively avoid chlorine (Cl)2) And hypochlorite (ClO)-) The use of the method can avoid the decomposition of the potassium ferrate at high temperature.
A green preparation method of potassium ferrate comprises the following steps:
(1) preparing intermediate sodium ferrite: dissolving ferric nitrate nonahydrate in a sodium hydroxide deionized water solution to form a premix, respectively preheating the premix and 3-6mol/L of sodium hydroxide solution, then mixing, introducing preheated compressed air, stirring, reacting at the temperature of 220-300 ℃ for 1-4 hours, cooling, separating and settling to obtain a liquid which is a sodium ferrite solution;
(2) preparing sodium ferrate by an electrolytic oxidation method: putting the sodium ferrite solution obtained in the step (1) into an electrolytic bath, and carrying out electrolytic reaction to obtain a sodium ferrate solution;
(3) preparing potassium ferrate: and (3) under the condition of ice-water bath, adding a KOH saturated solution into the sodium ferrate solution obtained in the step (2), separating out a purple black solid, filtering and drying to obtain the potassium ferrate.
Preferably, in the premix, the ratio of iron nitrate nonahydrate: deionized water: the mass ratio of the sodium hydroxide is (4-4.5) to (10-30) to (8-10).
Preferably, the mass ratio of the premix to the 3-6mol/L sodium hydroxide solution is (2.5-3.6): 1.
preferably, the preheating is all preheated to 50-70 ℃.
Preferably, in the electrolytic reaction, the electrolytic materials of the cathode and the anode are inert electrodes.
Preferably, the inert electrode is graphite, carbon rod or nickel sheet.
Preferably, in the electrolytic reaction, the current is 300mA-540mA, and the current density is 50-90A/cm2And the electrolytic reaction time is 3-4 hours.
Preferably, in step (3), the molar amounts of sodium ferrate and KOH are equal.
In the step (3), the drying is vacuum drying at 60-70 ℃ to constant weight.
The ice-water bath is a water bath reaction carried out under an ice-water mixture.
The chemical principle and the reaction equation related by the invention are as follows:
step 1: NaOH + Fe (NO)3）3→NaFeO2+NaNO3+H2O
Step 2: FeO2 -+OH-→FeO4 2-+H2O+e-
And step 3: na (Na)2FeO4+KOH→K2FeO4+NaOH
The invention has the advantages that:
the invention effectively avoids chlorine (Cl) when the wet oxidation method is used for preparing the potassium ferrate in the prior art by preparing the intermediate sodium ferrite2) And hypochlorite (ClO)-) The use of the method avoids the decomposition of the potassium ferrate at high temperature, and is a green preparation method.
Drawings
FIG. 1 is an infrared spectrum.
Detailed Description
Example 1
A green preparation method of potassium ferrate comprises the following steps:
(1) preparing intermediate sodium ferrite: preparing 16g of sodium hydroxide and 40g of deionized water to obtain a sodium hydroxide solution, adding 8g of ferric nitrate nonahydrate to form 64g of premix, respectively preheating 25g of the premix and 3mol/L of the sodium hydroxide solution to 70 ℃, mixing, introducing compressed air preheated to 70 ℃, reacting for 1.5 hours at 220 ℃, cooling, separating and settling to obtain a liquid sodium ferrite solution;
(2) preparing sodium ferrate by an electrolytic oxidation method: putting the sodium ferrite solution obtained in the step (1) into an electrolytic bath for electrolytic reaction, wherein the electrolytic materials of a cathode and an anode are graphite electrodes, the current is 400mA, and the current density is 60A/cm2Electrolyzing for 3 hours to obtain a sodium ferrate solution;
(3) preparing potassium ferrate: adding a KOH saturated solution into the sodium ferrate solution obtained in the step (2) under the condition of ice-water bath, wherein the mole numbers of the sodium ferrate and the KOH are equal, separating out a purple black solid, filtering, and drying in vacuum at 60 ℃ to constant weight to obtain potassium ferrate;
4.7g of potassium ferrate was obtained with a yield of 75%.
Example 2
A green preparation method of potassium ferrate comprises the following steps:
(1) preparing intermediate sodium ferrite: preparing 16g of sodium hydroxide and 40g of deionized water to obtain a sodium hydroxide solution, adding 9 g of ferric nitrate nonahydrate to form 65 g of premix, respectively preheating 25g of the premix and 6mol/L of the sodium hydroxide solution to 50 ℃, mixing, introducing compressed air preheated to 50 ℃, reacting for 4 hours at 220 ℃, cooling, separating and settling to obtain a liquid sodium ferrite solution;
(2) preparing sodium ferrate by an electrolytic oxidation method: putting the sodium ferrite solution obtained in the step (1) into an electrolytic bath for electrolytic reaction, wherein the electrolytic materials of a cathode and an anode are graphite electrodes, the current is 540mA, and the current density is 50A/cm2Electrolyzing for 4 hours to obtain a sodium ferrate solution;
(3) preparing potassium ferrate: adding a KOH saturated solution into the sodium ferrate solution obtained in the step (2) under the condition of ice-water bath, wherein the mole numbers of the sodium ferrate and the KOH are equal, separating out a purple black solid, filtering, and drying in vacuum at 60 ℃ to constant weight to obtain potassium ferrate;
5.7g of potassium ferrate were obtained in a yield of 78%.
Example 3
A green preparation method of potassium ferrate comprises the following steps:
(1) preparing intermediate sodium ferrite: preparing 20g of sodium hydroxide and 60g of deionized water to obtain a sodium hydroxide solution, adding 8g of ferric nitrate nonahydrate to form 88 g of premix, respectively preheating 25g of the premix and 4mol/L of the sodium hydroxide solution to 60 ℃, mixing, introducing compressed air preheated to 60 ℃, reacting for 1 hour at 300 ℃, cooling, separating and settling to obtain a liquid sodium ferrite solution;
(2) preparing sodium ferrate by an electrolytic oxidation method: mixing the ferrite of step (1)The sodium solution is placed in an electrolytic bath for electrolytic reaction, the electrolytic materials of the cathode and the anode are graphite electrodes, the current is 300mA, and the current density is 90A/cm2Electrolyzing for 3 hours to obtain a sodium ferrate solution;
(3) preparing potassium ferrate: adding a KOH saturated solution into the sodium ferrate solution obtained in the step (2) under the condition of ice-water bath, wherein the mole numbers of the sodium ferrate and the KOH are equal, separating out a purple black solid, filtering, and drying in vacuum at 70 ℃ to constant weight to obtain potassium ferrate;
5.0g of potassium ferrate was obtained with a yield of 80%.
Example 4
A green preparation method of potassium ferrate comprises the following steps:
(1) preparing intermediate sodium ferrite: preparing 20g of sodium hydroxide and 40g of deionized water to obtain a sodium hydroxide solution, adding 9 g of ferric nitrate nonahydrate to form 69 g of premix, respectively preheating 25g of the premix and 5mol/L of the sodium hydroxide solution to 70 ℃, mixing, introducing compressed air preheated to 70 ℃, reacting for 2 hours at 250 ℃, cooling, separating and settling to obtain a liquid sodium ferrite solution;
(2) preparing sodium ferrate by an electrolytic oxidation method: putting the sodium ferrite solution obtained in the step (1) into an electrolytic bath for electrolytic reaction, wherein the electrolytic materials of a cathode and an anode are graphite electrodes, the current is 400mA, and the current density is 80A/cm2Electrolyzing for 3 hours to obtain a sodium ferrate solution;
(3) preparing potassium ferrate: adding a KOH saturated solution into the sodium ferrate solution obtained in the step (2) under the condition of ice-water bath, wherein the mole numbers of the sodium ferrate and the KOH are equal, separating out a purple black solid, filtering, and drying in vacuum at 70 ℃ to constant weight to obtain potassium ferrate;
5.7g of potassium ferrate were obtained in a yield of 78%.
Performance detection
The purple black material obtained in example 1 was subjected to infrared spectroscopic examination, and the results are shown in FIG. 1.
It can be seen that the distance is 801cm-1Has a strong absorption peak, which is the ferrateThe characteristic absorption peak of the root can be obtained, and the obtained substance is potassium ferrate.
Claims (9)
1. A green preparation method of potassium ferrate is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing intermediate sodium ferrite: dissolving ferric nitrate nonahydrate in a sodium hydroxide deionized water solution to form a premix, respectively preheating the premix and 3-6mol/L of sodium hydroxide solution, then mixing, introducing preheated compressed air, stirring, reacting at the temperature of 220-300 ℃ for 1-4 hours, cooling, separating and settling to obtain a liquid which is a sodium ferrite solution;
(2) preparing sodium ferrate by an electrolytic oxidation method: putting the sodium ferrite solution obtained in the step (1) into an electrolytic bath, and carrying out electrolytic reaction to obtain a sodium ferrate solution;
(3) preparing potassium ferrate: and (3) under the condition of ice-water bath, adding a KOH saturated solution into the sodium ferrate solution obtained in the step (2), separating out a purple black solid, filtering and drying to obtain the potassium ferrate.
2. The green process for the preparation of potassium ferrate according to claim 1, wherein: in the premix, iron nitrate nonahydrate: deionized water: the mass ratio of the sodium hydroxide is (4-4.5) to (10-30) to (8-10).
3. The green process for the preparation of potassium ferrate according to claim 2, wherein: the mass ratio of the premix to 3-6mol/L sodium hydroxide solution is (2.5-3.6): 1.
4. the green process for the preparation of potassium ferrate according to claim 1, wherein: preheating to 50-70 ℃.
5. The green process for the preparation of potassium ferrate according to claim 3, wherein: in the electrolytic reaction, the electrolytic materials of the cathode and the anode are inert electrodes.
6. The green process for the preparation of potassium ferrate according to claim 5, wherein: the inert electrode is graphite, a carbon rod or a nickel sheet.
7. The green process for the preparation of potassium ferrate according to claim 5, wherein: in the electrolytic reaction, the current is 300mA-540mA, and the current density is 50-90A/cm2And the electrolytic reaction time is 3-4 hours.
8. The green process for the preparation of potassium ferrate according to claim 1, wherein: in the step (3), the mole numbers of the sodium ferrate and the KOH are equal.
9. The green process for the preparation of potassium ferrate according to claim 1, wherein: in the step (3), the drying is vacuum drying at 60-70 ℃ to constant weight.
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