CN109126684B - Preparation method of base iron-loaded mixed ash adsorbent - Google Patents
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Abstract
The invention discloses a preparation method of a basic iron-based mixed ash adsorbent, which comprises the following steps of (1) weighing ferrous sulfate and ferric sulfate, dissolving the ferrous sulfate and the ferric sulfate in water, and preparing a mixed iron-based solution by sealed stirring; (2) weighing fly ash and ground blast furnace slag, mixing and stirring to prepare mixed ash powder; (3) mixing and stirring the mixed iron-based solution and the mixed ash powder to prepare iron-carrying mixed ash slurry; (4) weighing sodium hydroxide and sodium carbonate, dissolving in water, and sealing and stirring to prepare basic caustic alkali solution; (5) mixing the iron-loaded mixed ash slurry with basic caustic solution, sealing and stirring, vacuum drying, and grinding to obtain the basic iron-loaded mixed ash adsorbent. The preparation method of the base iron-loaded mixed ash adsorbent is simple, the raw materials are cheap, and the preparation cost of the adsorbent is low; the prepared adsorbent has high selective adsorption and stability, and can simultaneously remove strontium ions, cesium ions and cobalt ions in radioactive wastewater with the pH value of 4-13.
Description
Technical Field
The invention relates to treatment of radioactive wastewater in nuclear power generation, in particular to a preparation method of a base iron-loaded mixed ash adsorbent.
Background
Nuclear fuel production and nuclear power plant operations produce large amounts of radioactive wastewater, and the safe treatment of radioactive wastewater has become a critical issue in the development of nuclear energy. In Hakka Japonensis nuclear accident, strontium137Cs, cesium90Sr and cobalt60The probability of detecting three radionuclides of Co is the highest, and the three radioactive elements have strong radioactivity, long half-life period and high biological and chemical toxicity, so that the three radioactive elements have great harm to human and ecological environment. The prior methods for treating radioactive wastewater mainly comprise a concentration method, a chemical precipitation method, a coprecipitation method, a physical adsorption method, an ion exchange method, a reverse osmosis method, an ultra (micro) filtration method, a solvent extraction method and the like. Because the radioactive waste liquid contains a large amount of Na+、K+、Ca2+And the problems of steep increase of the amount of radioactive wastewater to be treated, complex process, long treatment period and the like caused by various competitive cations make the treatment of the polluted waste liquid by simply applying a concentration method, a chemical precipitation method, a reverse osmosis method, an ultra (micro) filtration method, a solvent extraction method and other methods increasingly difficult.
The ion exchange method has the advantages of low cost, simple operation, high efficiency and the like, so that the ion exchange method particularly attracts attention in the aspect of radioactive wastewater treatment. Many types of ion exchange materials have been used in the field of waste liquid disposal, such as zeolites, transition metal ferrocyanides, double layered hydroxides, titanosilicates, metal sulfides, and the like. However, the existing ion exchange materials also have disadvantages, such as sensitivity to the pH of the waste liquid, insufficient selective adsorption to strontium, cesium and cobalt ions, prominent secondary pollution, and expensive material for removing cesium ions.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems, the invention aims to provide a preparation method of a base iron-loaded mixed ash adsorbent, which is simple, and the prepared adsorbent has strong adsorption property and stability and can simultaneously remove strontium, cesium and cobalt ions in radioactive wastewater with the pH value of 4-13.
The technical scheme is as follows: in order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows: a preparation method of a base iron-loaded mixed ash adsorbent comprises the following steps:
(1) preparation of mixed iron-based solution: respectively weighing ferrous sulfate and ferric sulfate, simultaneously mixing the ferrous sulfate and the ferric sulfate into water, and stirring the mixture in a sealed state until the ferrous sulfate and the ferric sulfate are completely dissolved to obtain a mixed iron-based solution;
(2) preparing mixed ash powder: respectively weighing fly ash and ground blast furnace slag, and mixing and stirring to obtain mixed ash powder;
(3) preparing iron-carrying mixed ash slurry: mixing the mixed iron-based solution with the mixed ash powder, and stirring in a sealed state to obtain iron-carrying mixed ash slurry;
(4) preparation of basic caustic solution: respectively weighing sodium hydroxide and sodium carbonate, simultaneously mixing the sodium hydroxide and the sodium carbonate into water, and stirring the mixture in a sealed state until the sodium hydroxide and the sodium carbonate are completely dissolved to obtain basic caustic lye;
(5) preparing an iron-carrying mixed ash adsorbent: mixing the iron-carrying type mixed ash slurry with basic caustic lye, stirring in a sealed state to obtain a basic iron-carrying type mixed ash flocculating constituent, vacuum-drying at a certain temperature until the material quality is constant, and grinding to obtain basic iron-carrying type mixed ash adsorbent powder.
Further, the molar ratio of Fe (II) in the ferrous sulfate to Fe (III) in the ferric sulfate in the step (1) is 2: 1-4: 1; the mass ratio of the fly ash to the ground blast furnace slag in the step (2) is 6: 4-9: 1; the liquid-solid ratio of the mixed iron-based solution to the mixed ash powder in the step (3) is 0.75-1.25 mL:1 g; the hydrogen oxidation in the step (4)OH in sodium-The molar ratio of Fe (II) to Fe (III) in the mixed iron-based solution in the step (1) is 3: 1-5: 1, and CO in the sodium carbonate3 2-With OH in sodium hydroxide-The molar ratio is 0.2: 1-0.4: 1.
Further, the total molar concentration of Fe (II) + Fe (III) in the mixed iron-based solution is 0.5-1.5 moL/L; OH in the base caustic-The molar concentration is 1.5-7.5 moL/L, CO3 2-The molar concentration is 0.3-3 moL/L.
Furthermore, the grinding time of the blast furnace slag in the step (2) is 1-3 h, and the specific surface area of the slag is increased by reducing the distribution range of the grain diameter of the blast furnace slag, so that the surface sedimentation load of Fe (II) and Fe (III) is facilitated.
Further, the stirring time in the step (2) is 5-10 min.
Further, in the step (3), the stirring speed is 30-60 rpm, and the stirring time is 10-30 min, so as to enhance the loading effect of Fe (II) and Fe (III) in the iron-based solution on the surface of the mixed ash powder.
Further, in the step (5), the stirring speed is 50-80 rpm, and the stirring time is 10-30 min, so that Fe (II), Fe (III) and OH are reacted-Fully contacts with each other, thereby strengthening the generation of the alkali-based iron-loaded mixed ash flocculating constituent.
Further, the vacuum degree of vacuum drying in the step (5) is-100-0 kPa, the temperature is 30-120 ℃, and the automatic stirring and uniform mixing of the basic iron-carrying mixed ash flocculating body can be realized through the foaming effect in the drying process.
The working principle is as follows: the invention combines an iron-based adsorption material with two inorganic ion exchange materials of fly ash and blast furnace slag to prepare the alkali-based iron-loaded mixed ash adsorbent. Additional advantages of the iron-based adsorption process are represented by: the method has the advantages of excellent selectivity, high-efficiency adsorption property and better environmental compatibility in the same pH range. Based on these characteristics, iron-based adsorption can be used to enhance inorganic ion exchange technology.
Loading iron-base adsorbing material on inorganic ion exchange material, and synthesizingThe surface potential of the iron-based adsorbing material is changed by adjusting the molar ratio of Fe (II) to Fe (III), so that the electrostatic adsorption of strontium, cesium and cobalt ions is increased. By adjusting CO3 2-With OH-And (3) the molar ratio is used for inducing the generation of iron-based minerals with different crystal structures so as to improve the load stability of the iron-based adsorption material on the ion exchange material. At the same time, CO is adjusted in the synthesis process3 2-With OH-The change of the doping amount can also increase the specific surface area of the iron-based adsorption material, increase the surface pore distribution surface of the material and increase the adsorption capacity of the iron-based adsorption material.
The fly ash has strong cation exchange capacity, and the microstructure of the fly ash comprises SiO4Tetrahedron and AlO6Two-dimensional layered structure composed of octahedron, which comprises three-dimensional stereo unit cell structure, and many exchangeable cations (such as Na) between its electronegative unit layers+、Mg2+、Ca2+、Fe2+) And the strontium, cesium and cobalt ions are adsorbed in an aqueous environment through a screening effect. In the synthetic process of the adsorbent, the addition of sodium hydroxide and sodium carbonate is beneficial to realizing the precipitation of iron ions and CO3 2-The iron-based flocculent precipitate formed by doping Fe (II) and Fe (III) as anions can not only balance the valence state, but also form precipitates with strontium and cobalt ions to play a role in adsorption. For blast furnace slag, CO3 2-With OH-The addition of the alkali-activated carbon also creates an alkali-activated environment, which is beneficial to strengthening the processes of ion adsorption and exchange and strengthening the geological polymerization of alkali-activated blast furnace slag, thereby strengthening the stability of the alkali-iron-carrying mixed slag adsorbent. Meanwhile, under an acidic environment, the mixed powder of the fly ash and the blast furnace slag can absorb a large amount of H+. Therefore, the coal ash and the blast furnace slag are mixed to be used as the carrying object of the iron-based adsorption material, so that the acid resistance of the iron-based adsorption material can be enhanced, and the stability of the alkali-carried iron-based mixed ash adsorbent can also be enhanced.
The alkali-based iron-loaded mixed ash adsorbent can realize simultaneous removal of strontium, cesium and cobalt ions in a water body through adsorption in multiple ways: the primary transfer of strontium, cesium and cobalt ions from a water body to the surface of the adsorbent is realized through electrostatic adsorption and ion exchange; the adsorption process of strontium, cesium and cobalt ions on the surface of the adsorbent is strengthened through chemical precipitation, chemical coprecipitation and ion surface layer permeation; further migration of strontium, cesium and cobalt ions in the adsorbent structure is realized through a molecular sieve effect; the stable storage of strontium, cesium and cobalt ions in the adsorbent is realized through hydration reaction and geological polymerization.
Has the advantages that: the preparation method of the basic iron-carrying mixed ash adsorbent is simple, the related raw materials are cheap, and the preparation cost of the adsorbent is low; the prepared basic iron-loaded mixed ash adsorbent has high selective adsorption and acid resistance, can simultaneously remove strontium, cesium and cobalt ions in radioactive wastewater with the pH of 4-13, enlarges the pH application range of the adsorbent in the waste liquid, and simplifies the waste liquid purification process flow; the adsorbent has stronger stability and low chemical loss in the adsorption and recovery processes.
Drawings
FIG. 1 is a flow chart of preparation of iron-carrying mixed ash adsorbent and its application in treating water containing radioactive elements of strontium, cesium and cobalt.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example 1
The influence of different molar ratios of Fe (II) and Fe (III) on the removal rate of strontium, cesium and cobalt ions in the water body is as follows:
as shown in fig. 1, the preparation process of the iron-carrying mixed ash adsorbent specifically comprises the following steps:
preparation of mixed iron-based solution: ferrous sulfate and ferric sulfate are respectively weighed according to the molar ratio of ferrous iron (Fe (II)) to ferric iron (Fe (III)) of 2:1, 2.5:1, 3:1, 3.5:1 and 4:1, then the ferrous sulfate and the ferric sulfate are simultaneously mixed into distilled water, and the mixture is stirred in a sealed state until the ferrous sulfate and the ferric sulfate are completely dissolved to obtain a mixed iron-based solution with the total molar concentration of Fe (II) and Fe (III) of 0.5 moL/L.
Preparing mixed ash powder: and weighing the fly ash and the blast furnace slag which is ground by the ball mill at a high speed for 1h according to the mass ratio of 6:4, mixing, and manually stirring for 5min to obtain mixed ash powder.
Preparing iron-carrying mixed ash slurry: and mixing the mixed iron-based solution and the mixed ash powder according to the liquid-solid ratio of 0.75mL:1g, and stirring for 10min at 30rpm in a sealed state to obtain iron-carrying mixed ash slurry.
Preparation of basic caustic solution: according to OH-Sodium hydroxide was weighed in a molar ratio of Fe (II) + Fe (III) of 3:1 and in terms of CO3 2-With OH-Weighing sodium carbonate with a molar ratio of 0.2:1, then simultaneously mixing the sodium hydroxide and the sodium carbonate into distilled water, stirring the mixture in a sealed state until the sodium hydroxide and the sodium carbonate are completely dissolved to obtain OH-The molar concentration is 1.5moL/L, CO3 2-A base caustic solution having a molarity of 0.3moL/L per unit volume.
Preparing the alkali-based iron-loaded mixed ash adsorbent: mixing the iron-carrying mixed ash slurry with basic caustic lye, stirring for 10min at 50rpm in a sealed state to obtain the basic iron-carrying mixed ash flocculating constituent. And then quickly placing the basic group iron-carrying type mixed ash flocculating constituent into a vacuum drying oven, drying at the vacuum degree of-100 kPa and the temperature of 30 ℃ until the quality is constant, taking out the basic group iron-carrying type mixed ash, and grinding to obtain basic group iron-carrying type mixed ash adsorbent powder.
Treatment of water containing radioactive elements of strontium, cesium and cobalt (as shown in figure 1): adding the base iron-loaded mixed ash adsorbent powder into a water body containing 1mg/L strontium, 1mg/L cesium and 1mg/L cobalt and having a pH value of 4 according to a solid-to-liquid ratio of 1g:1L, and stirring at 100rpm for 10 min. Wherein, the pH value of the water body is titrated and adjusted by sulfuric acid and sodium hydroxide solution with the concentration of 0.5 moL/L.
Measuring the concentration of strontium ions, cesium ions and cobalt ions in the water body, wherein the concentration of the strontium ions is measured according to a program specified in the standard & lt & gt method for measuring strontium by underground water quality inspection by flame emission spectrometry (DZ/T0064.39-93); the concentration of cesium ions was determined according to the procedure specified in Standard underground Water quality inspection methods for rubidium and cesium determination by flame emission Spectroscopy (DZ/T0064.36-93); the concentration of cobalt ions was determined according to the procedure specified in Standard "determination of cobalt in Water 5-chloro-2- (pyridylazo) -1, 3-diaminobenzene spectrophotometry" (HJ 550-2015). The removal efficiency of the strontium ions, the cesium ions and the cobalt ions in the water body is calculated according to the percentage ratio of the difference value of the concentration of the strontium ions, the cesium ions and the cobalt ions in the water body before the experiment to the concentration of the strontium ions, the cesium ions and the cobalt ions in the water body after the experiment to the concentration of the strontium ions, the cesium ions and the cobalt ions in the liquid before the experiment, and the test results are shown in table 1.
TABLE 1 influence of different molar ratios of Fe (II) to Fe (III) on removal rate of strontium, cesium and cobalt ions in water
The results in table 1 show that the removal rates of strontium, cesium and cobalt ions in the water body are all greater than 97% after the alkali-based iron-loaded mixed ash adsorbent is added into the water body. And as the molar ratio of Fe (II) to Fe (III) is increased, the removal rate of strontium, cesium and cobalt is correspondingly improved. When the molar ratio of Fe (II) to Fe (III) is 3.5:1, the removal rates of strontium, cesium and cobalt in the water body are the highest, and are respectively 99.21%, 98.83% and 99.82%.
Example 2
Influence of different mass ratios of the fly ash and the blast furnace slag on removal rates of strontium ions, cesium ions and cobalt ions in the water body is as follows:
the preparation process is the same as that of example 1, and is different from that of example 1:
preparation of mixed iron-based solution: fe (II) to Fe (III) molar ratio of 3.5:1, a mixed iron-based solution was prepared with a total molar concentration of Fe (II) to Fe (III) of 1 moL/L.
Preparing mixed ash powder: respectively weighing fly ash and blast furnace slag which is ground by a ball mill at a high speed for 2 hours according to the mass ratio of 6:4, 7:3, 8:2 and 9:1, mixing, and manually stirring for 7.5min to obtain mixed ash powder.
Preparing iron-carrying mixed ash slurry: and (3) mixing the mixed iron-based solution with the mixed ash powder according to the liquid-solid ratio of 1mL:1g, and stirring at 40rpm for 20min in a sealed state to obtain the iron-carrying mixed ash slurry.
Preparation of basic caustic solution: OH group-In a molar ratio of 4:1 with Fe (II) + Fe (III)3 2-With OH-Molar ratio 0.3:1, preparation of OH-Molarity of the solutionIs 4moL/L, CO3 2-A molar concentration of 1.2moL/L of base caustic solution per unit volume.
Preparing the alkali-based iron-loaded mixed ash adsorbent: mixing the iron-carrying mixed ash slurry with basic caustic lye, stirring at 60rpm for 20min under a sealed state, drying at 60 ℃ under a vacuum degree of-50 kPa, and grinding to obtain the basic iron-carrying mixed ash adsorbent powder.
Treating a water body containing radioactive elements of strontium, cesium and cobalt: adding the base iron-loaded mixed ash adsorbent powder into a water body containing 100.5mg/L strontium, 100.5mg/L cesium and 100.5mg/L cobalt and having a pH of 7 according to a solid-to-liquid ratio of 5.5g:1L, and stirring at 120rpm for 20 min. The concentrations of strontium, cesium and cobalt ions in the water body are measured, and the test results are shown in table 2.
TABLE 2 influence of different mass ratios of fly ash and blast furnace slag on removal rate of strontium, cesium and cobalt ions in water
From the results in table 2, it can be seen that the removal rates of strontium, cesium and cobalt ions in the water body are all greater than 91% after the alkali-based iron-loaded mixed ash adsorbent is added into the water body. And the removal rate of strontium, cesium and cobalt is gradually improved along with the increase of the mass ratio of the fly ash to the blast furnace slag. When the mass ratio of the fly ash to the blast furnace slag is 9:1, the removal rates of strontium, cesium and cobalt in the water body are respectively 95.54%, 93.12% and 96.67%.
Example 3
OH-Influence of different molar ratios to Fe (II) + Fe (III) on removal rate of strontium, cesium and cobalt ions in water body:
the preparation process is the same as that of example 1, and is different from that of example 1:
preparation of mixed iron-based solution: fe (II) to Fe (III) molar ratio of 3.5:1, a mixed iron-based solution was prepared with a total molar concentration of Fe (II) to Fe (III) of 1.5 moL/L.
Preparing mixed ash powder: and respectively weighing the fly ash and the blast furnace slag which is ground by the ball mill for 3 hours at a high speed according to the mass ratio of 9:1, mixing, and manually stirring for 10min to obtain mixed ash powder.
Preparing iron-carrying mixed ash slurry: and (3) mixing the mixed iron-based solution with the mixed ash powder according to the liquid-solid ratio of 1.25mL:1g, and stirring at 50rpm for 30min in a sealed state to obtain iron-carrying mixed ash slurry.
Preparation of basic caustic solution: according to OH-Sodium hydroxide is weighed according to the molar ratio of Fe (II) + Fe (III) of 3:1, 3.5:1, 4:1, 4.5:1, 5:1 and according to CO3 2-With OH-Weighing sodium carbonate with a molar ratio of 0.4:1, then simultaneously mixing the sodium hydroxide and the sodium carbonate into distilled water, stirring the mixture in a sealed state until the sodium hydroxide and the sodium carbonate are completely dissolved to obtain OH-The molar concentrations are respectively 4.5, 5.25, 6, 6.75 and 7.5moL/L, corresponding to CO3 2-The molar concentrations were 1.8, 2.1, 2.4, 2.7, 3.0moL/L of base caustic solution per unit volume.
Preparing the alkali-based iron-loaded mixed ash adsorbent: mixing the iron-carrying mixed ash slurry with basic caustic lye, stirring for 30min at 70rpm under a sealed state, drying at 90 ℃ under 0kPa vacuum degree, and grinding to obtain the basic iron-carrying mixed ash adsorbent powder.
Treating a water body containing radioactive elements of strontium, cesium and cobalt: adding the base iron-loaded mixed ash adsorbent powder into a water body which contains 200mg/L strontium, 200mg/L cesium and 200mg/L cobalt and has a pH value of 10 according to a solid-liquid ratio of 10g:1L, and stirring at 140rpm for 30 min. The concentrations of strontium, cesium and cobalt ions in the water body are measured, and the test results are shown in table 3.
TABLE 3 OH-Influence of different molar ratios of Fe (II) to Fe (III) on removal rate of strontium, cesium and cobalt ions in water body
The results in table 3 show that the removal rates of strontium, cesium and cobalt ions in the water body are all greater than 90% after the alkali-based iron-loaded mixed ash adsorbent is added into the water body. And with OH-The mol ratio of the strontium to Fe (II) to Fe (III) is increased, and the removal rate of the strontium, the cesium and the cobalt is gradually improved. OH group-In a molar ratio of 5:1 with Fe (II) + Fe (III)And the removal rates of strontium, cesium and cobalt in the water body are the highest, namely 93.65%, 92.14% and 94.36% respectively.
Example 4
CO3 2-With OH-Influence of different molar ratios on removal rates of strontium, cesium and cobalt ions in the water body is as follows:
the preparation process is the same as that of example 1, and is different from that of example 1:
preparation of mixed iron-based solution: fe (II) to Fe (III) molar ratio of 3.5:1, a mixed iron-based solution was prepared with a total molar concentration of Fe (II) to Fe (III) of 1.5 moL/L.
Preparing mixed ash powder: and respectively weighing the fly ash and the blast furnace slag which is ground by the ball mill for 3 hours at a high speed according to the mass ratio of 9:1, mixing, and manually stirring for 10min to obtain mixed ash powder.
Preparing iron-carrying mixed ash slurry: and (3) mixing the mixed iron-based solution with the mixed ash powder according to the liquid-solid ratio of 1.25mL:1g, and stirring at 60rpm for 30min in a sealed state to obtain iron-carrying mixed ash slurry.
Preparation of basic caustic solution: according to OH-Sodium hydroxide was weighed in a 5:1 molar ratio to Fe (II) + Fe (III) and in terms of CO3 2-With OH-Weighing sodium carbonate with a molar ratio of 0.2:1, 0.25:1, 0.3:1, 0.35:1, 0.4:1, simultaneously mixing sodium hydroxide and sodium carbonate into distilled water, stirring under sealed condition until completely dissolving to obtain OH-The molar concentration is 7.5moL/L, corresponding to CO3 2-The molar concentrations are 1.5, 1.875, 2.25, 2.625 and 3.0moL/L per unit volume of base caustic solution.
Preparing the alkali-based iron-loaded mixed ash adsorbent: mixing the iron-carrying mixed ash slurry with basic caustic lye, stirring for 30min at 80rpm under a sealed state, drying at 120 ℃ under the vacuum degree of 0kPa, and grinding to obtain the basic iron-carrying mixed ash adsorbent powder.
Treating a water body containing radioactive elements of strontium, cesium and cobalt: adding the base iron-loaded mixed ash adsorbent powder into a water body containing 200mg/L strontium, 200mg/L cesium and 200mg/L cobalt and having a pH value of 13 according to a solid-to-liquid ratio of 10g:1L, and stirring at 160rpm for 30 min. The concentrations of strontium, cesium and cobalt ions in the water body are measured, and the test results are shown in table 4.
TABLE 4 CO3 2-With OH-Influence of different molar ratios on removal rate of strontium, cesium and cobalt ions in water body
From the results in table 4, it can be seen that the removal rates of strontium, cesium and cobalt ions in the water body are all greater than 86% after the alkali-based iron-loaded mixed ash adsorbent is added into the water body. And with CO3 2-With OH-The molar ratio is increased, and the removal rate of strontium, cesium and cobalt is gradually improved. CO 23 2-With OH-The molar ratio is 0.4:1, and the removal rates of strontium, cesium and cobalt in the water body are the highest, namely 93.87%, 92.46% and 95.08% respectively.
Claims (7)
1. The preparation method of the basic iron-supported mixed ash adsorbent is characterized by comprising the following steps of:
(1) preparation of mixed iron-based solution: respectively weighing ferrous sulfate and ferric sulfate, simultaneously mixing the ferrous sulfate and the ferric sulfate into water, and stirring the mixture in a sealed state until the ferrous sulfate and the ferric sulfate are completely dissolved to obtain a mixed iron-based solution;
(2) preparing mixed ash powder: respectively weighing fly ash and ground blast furnace slag, and mixing and stirring to obtain mixed ash powder;
(3) preparing iron-carrying mixed ash slurry: mixing the mixed iron-based solution with the mixed ash powder, and stirring in a sealed state to obtain iron-carrying mixed ash slurry;
(4) preparation of basic caustic solution: respectively weighing sodium hydroxide and sodium carbonate, simultaneously mixing the sodium hydroxide and the sodium carbonate into water, and stirring the mixture in a sealed state until the sodium hydroxide and the sodium carbonate are completely dissolved to obtain basic caustic lye;
(5) preparing an iron-carrying mixed ash adsorbent: mixing the iron-carrying type mixed ash slurry with basic caustic lye, stirring in a sealed state to obtain a basic iron-carrying type mixed ash flocculating constituent, carrying out vacuum drying at a certain temperature until the material quality is constant, and grinding to obtain basic iron-carrying type mixed ash adsorbent powder;
the molar ratio of Fe (II) in the ferrous sulfate in the step (1) to Fe (III) in the ferric sulfate is 2: 1-4: 1; the mass ratio of the fly ash to the ground blast furnace slag in the step (2) is 6: 4-9: 1; the liquid-solid ratio of the mixed iron-based solution to the mixed ash powder in the step (3) is 0.75-1.25 mL:1 g; OH in the sodium hydroxide in the step (4)-The molar ratio of Fe (II) to Fe (III) in the mixed iron-based solution in the step (1) is 3: 1-5: 1, and CO in the sodium carbonate3 2-With OH in sodium hydroxide-The molar ratio is 0.2: 1-0.4: 1.
2. The preparation method of the basic iron-based mixed ash adsorbent according to claim 1, wherein the total molar concentration of Fe (II) + Fe (III) in the mixed iron-based solution is 0.5-1.5 moL/L; OH in the base caustic-The molar concentration is 1.5-7.5 moL/L, CO3 2-The molar concentration is 0.3-3 moL/L.
3. The preparation method of the basic iron-supported mixed ash adsorbent according to claim 1, wherein the grinding time of the blast furnace slag in the step (2) is 1-3 h.
4. The preparation method of the basic iron-supported mixed ash adsorbent according to claim 1, wherein the stirring time in the step (2) is 5-10 min.
5. The preparation method of the base iron-supported mixed ash adsorbent according to claim 1, wherein the stirring speed in the step (3) is 30-60 rpm, and the stirring time is 10-30 min.
6. The preparation method of the base iron-supported mixed ash adsorbent according to claim 1, wherein the stirring speed in the step (5) is 50-80 rpm, and the stirring time is 10-30 min.
7. The preparation method of the base iron-supported mixed ash adsorbent according to claim 1, wherein the vacuum degree of vacuum drying in the step (5) is-100 to 0kPa, and the temperature is 30 to 120 ℃.
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