CN109126684A - A kind of preparation method of base iron load type mixed ash adsorbent - Google Patents
A kind of preparation method of base iron load type mixed ash adsorbent Download PDFInfo
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- CN109126684A CN109126684A CN201811275017.2A CN201811275017A CN109126684A CN 109126684 A CN109126684 A CN 109126684A CN 201811275017 A CN201811275017 A CN 201811275017A CN 109126684 A CN109126684 A CN 109126684A
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- 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
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- 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
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
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- 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
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
- G21F9/06—Processing
- G21F9/12—Processing by absorption; by adsorption; by ion-exchange
Abstract
The invention discloses the preparation methods of base iron load type mixed ash adsorbent, and (1) weighs ferrous sulfate and ferric sulfate is soluble in water, sealing stirring preparation mixing Fe-base Solution；(2) blast-furnace cinder after weighing flyash and grinding is mixed, and prepares mixed ash powder；(3) Fe-base Solution will be mixed and mixed ash powder is mixed, preparation carries swage mixed ash slurry；(4) it weighs sodium hydroxide and sodium carbonate is soluble in water, sealing stirring prepares basic aqueous caustic；(5) swage mixed ash slurry will be carried and basic aqueous caustic mixes, base iron load type mixed ash adsorbent is ground to obtain in sealing stirring, vacuum drying.The preparation method of base iron load type mixed ash adsorbent is simple, and raw material are inexpensive, and adsorbent preparation cost is low；Prepared adsorbent has high selection adsorptivity and stability, may be implemented to removal while pH is strontium, caesium, cobalt ions in 4~13 radioactive wastewaters.
Description
Technical field
The present invention relates to the processing of radioactive wastewater in nuclear energy power generation more particularly to a kind of base iron load type mixed ash to inhale
Attached dose of preparation method.
Background technique
Nuclear fuel production and nuclear power plant's operation can generate a large amount of radioactive wastewaters, and the safe handling of radioactive wastewater has become
The critical issue of nuclear power development.In Fukushima, Japan nuclear accident, strontium137Cs, caesium90Sr, cobalt60Tri- kinds of radionuclides of Co are detected
The probability highest arrived, these three radioactive elements since radioactivity is strong, long half time, biology are big with chemical toxicity, to the mankind and
Ecological environment constitutes greatly harm.Processing radioactive wastewater method mainly has concentration method, chemical precipitation method, co-precipitation at present
Method, physisorphtion, ion-exchange, hyperfiltration, super (micro-) filter method, solvent extraction etc..Because often containing in radioactive liquid waste
There are a large amount of Na+、K+、Ca2+Etc. a variety of competitive cations, bring radioactive wastewater amount to be processed increases suddenly, complex process,
The problems such as disposition period is long makes merely using concentration method, chemical precipitation method, hyperfiltration, super (micro-) filter method, solvent extraction
The methods of method disposition pollution waste liquid seems increasingly difficult.
Ion-exchange makes it in Spent Radioactive water process side because it has many advantages, such as at low cost, easy to operate, high-efficient
Face especially causes to pay close attention to.The ion exchange material of current many types has been applied to waste liquid disposal field, and such as zeolite crosses gold
Belong to ferrocyanide, double layered hydroxides, titan silicate, metal sulfide etc..However existing ion exchange material also has
Have a disadvantage, such as to the pH sensitive of waste liquid, to strontium, caesium, cobalt ions selective absorption is insufficient, secondary pollution is prominent, removal caesium from
The problems such as sub- material therefor is expensive.
Summary of the invention
Goal of the invention: in view of the above problems, the purpose of the present invention is to propose to a kind of base iron load type mixed ash adsorbents
Preparation method, preparation method is simple, the adsorbent being prepared have stronger characterization of adsorption and stability, may be implemented
PH is removed while being strontium, caesium, cobalt ions in 4~13 radioactive wastewaters.
Technical solution: to achieve the purpose of the present invention, the technical scheme adopted by the invention is that: a kind of base iron load type is mixed
Close the preparation method of grey slag adsorbent, comprising the following steps:
(1) it mixes the preparation of Fe-base Solution: weighing ferrous sulfate and ferric sulfate respectively, while being mixed into water, sealing state
Lower stirring obtains mixing Fe-base Solution to being completely dissolved；
(2) preparation of mixed ash powder: the blast-furnace cinder after weighing flyash and grinding respectively is mixed, obtains
Mixed ash powder；
(3) it carries the preparation of swage mixed ash slurry: mixing Fe-base Solution being mixed with mixed ash powder, seal shape
It is stirred under state, obtains carrying swage mixed ash slurry；
(4) preparation of basic aqueous caustic: weighing sodium hydroxide and sodium carbonate respectively, while being mixed into water, sealing state
Lower stirring obtains basic aqueous caustic to being completely dissolved；
(5) it carries the preparation of swage mixed ash adsorbent: swage mixed ash slurry will be carried and mixed with basic aqueous caustic,
It is stirred under sealing state, obtains base and carry swage mixed ash floccule body, quality of materials perseverance is dried under vacuum under certain temperature
Fixed, grinding obtains base and carries swage mixed ash absorbent powder.
Further, the Fe (II) in the step (1) in ferrous sulfate is with Fe (III) molar ratio in ferric sulfate
2:1~4:1；Flyash and the blast-furnace cinder mass ratio after grinding are 6:4~9:1 in the step (2)；In the step (3)
The liquid-solid ratio for mixing Fe-base Solution and mixed ash powder is 0.75~1.25mL:1g；In the step (4) in sodium hydroxide
OH-With mix Fe (II)+Fe (III) molar ratio 3:1~5:1 in Fe-base Solution in step (1), in the sodium carbonate
CO3 2-With the OH in sodium hydroxide-Molar ratio 0.2:1~0.4:1.
Further, Fe (II)+Fe (III) total mol concentration in the mixing Fe-base Solution is 0.5~1.5moL/L；
OH in the basis aqueous caustic-Molar concentration is 1.5~7.5moL/L, CO3 2-Molar concentration is 0.3~3moL/L.
Further, the milling time of blast-furnace cinder is 1~3h in the step (2), by reducing blast-furnace cinder partial size
Distribution, improve slag specific surface area, thus be more advantageous to Fe (II) and Fe (III) its surface settlement load.
Further, mixing time is 5~10min in the step (2).
Further, stirring rate is 30~60rpm in the step (3), and mixing time is 10~30min, to strengthen
Load effect of the Fe (II) and Fe (III) on mixed ash powder surface in Fe-base Solution.
Further, stirring rate is 50~80rpm in the step (5), and mixing time is 10~30min, makes Fe
(II) and Fe (III) and OH-It comes into full contact with, thus the generation of reinforced alkaline base load swage mixed ash floccule body.
Further, vacuum drying vacuum degree is -100~0kPa in the step (5), and temperature is 30~120 DEG C, this
Be conducive to base load swage mixed ash floccule body and realize that floccule body automatic stirring is mixed by barbotage in the drying process
It is even.
Working principle: the present invention is by iron-based adsorbent material and flyash, blast-furnace cinder both inorganic ion exchange materials
It combines, preparation base carries swage mixed ash adsorbent.The added benefit of iron-based adsorption process is embodied in: in identical pH
There is superior selectivity, more efficient characterization of adsorption, better environment mutually compatibility in range.Based on these features, iron
Base absorption can be used to strengthen inorganic ions switching technology.
Iron-based adsorbent material is supported on inorganic ion exchange material, by adjusting Fe (II) and Fe in synthesis process
(III) molar ratio changes iron-based adsorbent material surface potential to increase the Electrostatic Absorption to strontium, caesium, cobalt ions.By adjusting
CO3 2-With OH-Molar ratio, the iron-based mineral of inductive formation different crystal structure, to improve iron-based adsorbent material in ion exchange
Load stability on material.Meanwhile by adjusting CO in synthesis process3 2-With OH-The variation of volume can also increase iron-based
The specific surface area of adsorbent material increases material surface distribution of pores face, increases iron-based adsorbent material adsorption capacity.
Flyash has very strong cation exchange capacity (CEC), and microstructure both includes SiO4Tetrahedron and AlO6It is octahedra
The two-dimensional layered structure of composition, and including 3 D stereo cell configuration, there are many to hand between its structure negative electricity elementary layer
Cation (such as Na changed+、Mg2+、Ca2+、Fe2+), the suction to strontium, caesium, cobalt ions is realized by sieve effect in aqueous environments
It is attached.In adsorbent synthesis process, the addition of sodium hydroxide and sodium carbonate is advantageously implemented the precipitating of iron ion, CO3 2-As
Anion mix Fe (II), Fe (III) formed iron-based flocculent deposit in, not only can be with average valence state, additionally it is possible to strontium,
Cobalt ions forms precipitating, plays suction-operated.For blast-furnace cinder, CO3 2-With OH-Addition also built an alkali-activated carbonatite
Environment, this not only contributes to strengthen ionic adsorption, exchange process, and the geology polymerization for enhancing alkali-activated carbonatite blast-furnace cinder is made
With so that base carries the stability of swage mixed ash adsorbent.Meanwhile under acidic environment, flyash and blast-furnace cinder are mixed
A large amount of H can be received by closing powder+.Therefore, flyash and blast-furnace cinder are mixed into the loading as iron-based adsorbent material,
Not only can be with reinforced iron-base adsorbent material acid-resisting, it can also be with the stability of reinforced alkaline base load swage mixed ash adsorbent.
While base load swage mixed ash adsorbent adsorbs strontium, caesium, cobalt ions in realization water body through a variety of ways
Removal: the preliminary transfer of strontium, caesium, cobalt ions from water body to adsorbent surface is realized by Electrostatic Absorption and ion exchange；
It realizes by chemical precipitation, chemical coprecipitation, the infiltration of ion surface layer and strengthens adsorbent surface strontium, caesium, cobalt ions adsorption process；
By molecular sieving effect, the further migration of strontium, caesium, cobalt ions in sorbent structure is realized；Pass through hydration reaction and geology
Polymerization realizes that the stabilization of strontium, caesium, cobalt ions in adsorbent is sealed up for safekeeping.
The utility model has the advantages that the preparation method that base of the present invention carries swage mixed ash adsorbent is simple, related raw material
Inexpensive, adsorbent preparation cost is low；Prepared base, which carries swage mixed ash adsorbent, has high selection adsorptivity and antiacid
Property, it may be implemented to expand adsorbent in waste liquid to removal while pH is strontium, caesium, cobalt ions in 4~13 radioactive wastewaters
The pH scope of application, simplify effluent purifying process flow；Adsorbent has stronger stability, in absorption and removal process
Middle chemical wear is low.
Detailed description of the invention
Fig. 1 is to carry the preparation of swage mixed ash adsorbent and its for handling containing strontium, caesium, cobalt radioactive element water body
Flow chart.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
Embodiment 1
Fe (II) and influence of Fe (III) different mol ratio to strontium, caesium, cobalt ions removal rate in water body:
As shown in Figure 1, to carry the preparation process of swage mixed ash adsorbent, specifically:
Mix the preparation of Fe-base Solution: according to ferrous iron (Fe (II)) and ferric iron (Fe (III)) molar ratio 2:1,2.5:
1,3:1,3.5:1,4:1 weigh ferrous sulfate and ferric sulfate respectively, are then mixed into distilled water, stir simultaneously under sealing state
It mixes and obtains the unit volume that Fe (II) and Fe (III) total mol concentration are 0.5moL/L to being completely dissolved and mix Fe-base Solution.
The preparation of mixed ash powder: after weighing flyash and ball mill high speed grinding 1h respectively according to mass ratio 6:4
Blast-furnace cinder, mixing, hand operated mixing 5min obtain mixed ash powder.
It carries the preparation of swage mixed ash slurry: Fe-base Solution and mixed ash will be mixed according to liquid-solid ratio 0.75mL:1g
Powder mixes, and 30rpm stirs 10min under sealing state, obtains carrying swage mixed ash slurry.
The preparation of basic aqueous caustic: according to OH-Sodium hydroxide is weighed with Fe (II)+Fe (III) molar ratio 3:1, and is pressed
According to CO3 2-With OH-Molar ratio 0.2:1 weighs sodium carbonate, is then mixed into sodium hydroxide and sodium carbonate in distilled water simultaneously, close
It is stirred under envelope state to being completely dissolved, obtains OH-Molar concentration is 1.5moL/L, CO3 2-Molar concentration is the list of 0.3moL/L
Position volume basis aqueous caustic.
The preparation of base load swage mixed ash adsorbent: swage mixed ash slurry will be carried and mixed with basic aqueous caustic
It closes, 50rpm stirs 10min under sealing state, obtains base and carries swage mixed ash floccule body.Base is then carried into iron rapidly
Type mixed ash floccule body is placed in vacuum oven, and -100kPa vacuum degree is dried at 30 DEG C, until constant mass,
It takes out base and carries swage mixed ash, base is obtained after grinding and carries swage mixed ash absorbent powder.
Processing (as shown in Figure 1) containing strontium, caesium, cobalt radioactive element water body: according to solid-to-liquid ratio 1g:1L, base is carried into iron
Type mixed ash absorbent powder put into containing 1mg/L strontium, 1mg/L caesium, 1mg/L cobalt and pH be 4 water body in,
10min is stirred under 100rpm.Wherein, water body pH is that the sulfuric acid of 0.5moL/L and sodium hydroxide solution titration are adjusted with concentration.
Measure the concentration of strontium, caesium, cobalt ions in water body, concentration establishing criteria " the groundwater quality method of inspection fire of strontium ion
Flame emission spectrographic determination strontium " measurement of (DZ/T 0064.39-93) regulated procedure；Concentration establishing criteria " the underground of cesium ion
Water examination method flame emission spectrometry measures rubidium and caesium " measurement of (DZ/T 0064.36-93) regulated procedure；Cobalt ions
Concentration establishing criteria " the chloro- 2- of measurement 5- (pyridylazo) of water quality cobalt -1,3- diaminobenzene spectrophotometry " (HJ550-
2015) regulated procedure measures.Strontium in water body, caesium, cobalt ions each removal efficiency according to strontium in water body before testing, caesium, cobalt from
The difference of each ion concentration of water body strontium, caesium, cobalt ions and strontium in liquid before testing after each ion concentration and experiment of son, caesium,
The ratio percentage of each ion concentration of cobalt ions calculates, and test result is shown in Table 1.
1 Fe of table (II) and influence of Fe (III) different mol ratio to strontium, caesium, cobalt ions removal rate in water body
Can be seen that, be added in water body after base carries swage mixed ash adsorbent by 1 result of table, strontium in water body, caesium,
The removal rate of cobalt ions is all larger than 97%.And as Fe (II) and Fe (III) molar ratio increase, strontium, caesium, cobalt removal rate also phase
It should improve.When Fe (II) and Fe (III) molar ratio are 3.5:1, strontium, caesium, cobalt removal rate highest in water body, respectively
99.21%, 98.83%, 99.82%.
Embodiment 2
Flyash and blast-furnace cinder different quality compare the influence of strontium, caesium, cobalt ions removal rate in water body:
Preparation process is with embodiment 1, unlike the first embodiment:
Mix Fe-base Solution preparation: Fe (II) is 3.5:1 with Fe (III) molar ratio, and preparation Fe (II) always rubs with Fe (III)
The unit volume that your concentration is 1moL/L mixes Fe-base Solution.
The preparation of mixed ash powder: flyash is weighed respectively according to mass ratio 6:4,7:3,8:2,9:1 and ball mill is high
Blast-furnace cinder after speed grinding 2h, mixing, hand operated mixing 7.5min obtain mixed ash powder.
It carries the preparation of swage mixed ash slurry: Fe-base Solution and mixed ash powder will be mixed according to liquid-solid ratio 1mL:1g
It mixes, 40rpm stirs 20min under sealing state, obtains carrying swage mixed ash slurry.
The preparation of basic aqueous caustic: OH-With Fe (II)+Fe (III) molar ratio 4:1, CO3 2-With OH-Molar ratio 0.3:1,
Prepare OH-Molar concentration is 4moL/L, CO3 2-Molar concentration is the unit volume basis aqueous caustic of 1.2moL/L.
The preparation of base load swage mixed ash adsorbent: swage mixed ash slurry will be carried and mixed with basic aqueous caustic
It closing, 60rpm stirs 20min under sealing state, and it is -50kPa vacuum degree, dry at 60 DEG C, base is obtained after grinding carries swage mixing
Lime-ash absorbent powder.
Processing containing strontium, caesium, cobalt radioactive element water body: according to solid-to-liquid ratio 5.5g:1L, base is carried into swage combination ash
Slag adsorbent powder put into containing 100.5mg/L strontium, 100.5mg/L caesium, 100.5mg/L cobalt and pH be 7 water body in,
20min is stirred under 120rpm.The concentration of strontium, caesium, cobalt ions in water body is measured, test result is shown in Table 2.
2 flyash of table and blast-furnace cinder different quality compare the influence of strontium, caesium, cobalt ions removal rate in water body
As seen from the results in Table 2, after base load swage mixed ash adsorbent is added in water body, strontium, caesium, cobalt in water body
The removal rate of ion is all larger than 91%.And as flyash and blast-furnace cinder mass ratio increase, strontium, caesium, cobalt removal rate are gradually mentioned
It is high.When flyash and blast-furnace cinder mass ratio are 9:1, strontium, caesium, cobalt removal rate highest in water body, respectively 95.54%,
93.12%, 96.67%.
Embodiment 3
OH-Influence with Fe (II)+Fe (III) different mol ratio to strontium, caesium, cobalt ions removal rate in water body:
Preparation process is with embodiment 1, unlike the first embodiment:
Mix Fe-base Solution preparation: Fe (II) is 3.5:1 with Fe (III) molar ratio, and preparation Fe (II) always rubs with Fe (III)
The unit volume that your concentration is 1.5moL/L mixes Fe-base Solution.
The preparation of mixed ash powder: after weighing flyash and ball mill high speed grinding 3h respectively according to mass ratio 9:1
Blast-furnace cinder, mixing, hand operated mixing 10min obtain mixed ash powder.
It carries the preparation of swage mixed ash slurry: Fe-base Solution and mixed ash will be mixed according to liquid-solid ratio 1.25mL:1g
Powder mixes, and 50rpm stirs 30min under sealing state, obtains carrying swage mixed ash slurry.
The preparation of basic aqueous caustic: according to OH-With Fe (II)+Fe (III) molar ratio 3:1,3.5:1,4:1,4.5:1,
5:1 weighs sodium hydroxide, and according to CO3 2-With OH-Molar ratio 0.4:1 weighs sodium carbonate, then by sodium hydroxide and sodium carbonate
It is mixed into distilled water simultaneously, is stirred under sealing state to being completely dissolved, obtain OH-Molar concentration is respectively 4.5,5.25,6,
6.75,7.5moL/L, corresponding CO3 2-Molar concentration is respectively 1.8,2.1,2.4,2.7, the unit volume basis of 3.0moL/L it is severe
Property lye.
The preparation of base load swage mixed ash adsorbent: swage mixed ash slurry will be carried and mixed with basic aqueous caustic
It closing, 70rpm stirs 30min under sealing state, and it is 0kPa vacuum degree, dry at 90 DEG C, base is obtained after grinding carries swage combination ash
Slag adsorbent powder.
Processing containing strontium, caesium, cobalt radioactive element water body: according to solid-to-liquid ratio 10g:1L, base is carried into swage mixed ash
Absorbent powder put into containing 200mg/L strontium, 200mg/L caesium, 200mg/L cobalt and pH be 10 water body in, under 140rpm
Stir 30min.The concentration of strontium, caesium, cobalt ions in water body is measured, test result is shown in Table 3.
3 OH of table-Influence with Fe (II)+Fe (III) different mol ratio to strontium, caesium, cobalt ions removal rate in water body
As seen from the results in Table 3, after base load swage mixed ash adsorbent is added in water body, strontium, caesium, cobalt in water body
The removal rate of ion is all larger than 90%.And with OH-With Fe (II)+Fe (III) molar ratio increase, strontium, caesium, cobalt removal rate by
Step improves.OH-When with Fe (II)+Fe (III) molar ratio being 5:1, strontium, caesium, cobalt removal rate highest in water body, respectively
93.65%, 92.14%, 94.36%.
Embodiment 4
CO3 2-With OH-Influence of the different mol ratio to strontium, caesium, cobalt ions removal rate in water body:
Preparation process is with embodiment 1, unlike the first embodiment:
Mix Fe-base Solution preparation: Fe (II) is 3.5:1 with Fe (III) molar ratio, and preparation Fe (II) always rubs with Fe (III)
The unit volume that your concentration is 1.5moL/L mixes Fe-base Solution.
The preparation of mixed ash powder: after weighing flyash and ball mill high speed grinding 3h respectively according to mass ratio 9:1
Blast-furnace cinder, mixing, hand operated mixing 10min obtain mixed ash powder.
It carries the preparation of swage mixed ash slurry: Fe-base Solution and mixed ash will be mixed according to liquid-solid ratio 1.25mL:1g
Powder mixes, and 60rpm stirs 30min under sealing state, obtains carrying swage mixed ash slurry.
The preparation of basic aqueous caustic: according to OH-Sodium hydroxide is weighed with Fe (II)+Fe (III) molar ratio 5:1, and is pressed
According to CO3 2-With OH-Molar ratio 0.2:1,0.25:1,0.3:1,0.35:1,0.4:1 weigh sodium carbonate, then by sodium hydroxide and
Sodium carbonate is mixed into distilled water simultaneously, is stirred under sealing state to being completely dissolved, is obtained OH-Molar concentration is 7.5moL/L,
Corresponding CO3 2-Molar concentration is respectively the unit volume basis aqueous caustic of 1.5,1.875,2.25,2.625,3.0moL/L.
The preparation of base load swage mixed ash adsorbent: swage mixed ash slurry will be carried and mixed with basic aqueous caustic
It closing, 80rpm stirs 30min under sealing state, and it is 0kPa vacuum degree, dry at 120 DEG C, base is obtained after grinding carries swage combination ash
Slag adsorbent powder.
Processing containing strontium, caesium, cobalt radioactive element water body: according to solid-to-liquid ratio 10g:1L, base is carried into swage mixed ash
Absorbent powder put into containing 200mg/L strontium, 200mg/L caesium, 200mg/L cobalt and pH be 13 water body in, under 160rpm
Stir 30min.The concentration of strontium, caesium, cobalt ions in water body is measured, test result is shown in Table 4.
4 CO of table3 2-With OH-Influence of the different mol ratio to strontium, caesium, cobalt ions removal rate in water body
As seen from the results in Table 4, after base load swage mixed ash adsorbent is added in water body, strontium, caesium, cobalt in water body
The removal rate of ion is all larger than 86%.And with CO3 2-With OH-Molar ratio increases, and strontium, caesium, cobalt removal rate step up.CO3 2-
With OH-Molar ratio is 0.4:1, strontium, caesium, cobalt removal rate highest, respectively 93.87%, 92.46%, 95.08% in water body.
Claims (8)
1. a kind of preparation method of base iron load type mixed ash adsorbent, which comprises the following steps:
(1) it mixes the preparation of Fe-base Solution: weighing ferrous sulfate and ferric sulfate respectively, while being mixed into water, stirred under sealing state
It mixes to being completely dissolved, obtains mixing Fe-base Solution；
(2) preparation of mixed ash powder: the blast-furnace cinder after weighing flyash and grinding respectively is mixed, is mixed
Lime-ash powder；
(3) it carries the preparation of swage mixed ash slurry: mixing Fe-base Solution being mixed with mixed ash powder, is stirred under sealing state
It mixes, obtains carrying swage mixed ash slurry；
(4) preparation of basic aqueous caustic: sodium hydroxide and sodium carbonate are weighed respectively, while being mixed into water, is stirred under sealing state
It mixes to being completely dissolved, obtains basic aqueous caustic；
(5) it carries the preparation of swage mixed ash adsorbent: swage mixed ash slurry will be carried and mixed with basic aqueous caustic, sealed
It is stirred under state, obtains base and carry swage mixed ash floccule body, it is constant to be dried under vacuum to quality of materials under certain temperature, grinds
Mill obtains base and carries swage mixed ash absorbent powder.
2. the preparation method of base iron load type mixed ash adsorbent according to claim 1, which is characterized in that the step
Suddenly the Fe (II) in (1) in ferrous sulfate and Fe (III) molar ratio in ferric sulfate are 2:1~4:1；Powder in the step (2)
Blast-furnace cinder mass ratio after coal ash and grinding is 6:4~9:1；Mixing Fe-base Solution and combination ash ground-slag in the step (3)
The liquid-solid ratio at end is 0.75~1.25mL:1g；OH in the step (4) in sodium hydroxide-It is iron-based molten with being mixed in step (1)
Fe (II)+Fe (III) molar ratio 3:1~5:1 in liquid, the CO in the sodium carbonate3 2-With the OH in sodium hydroxide-Molar ratio
0.2:1~0.4:1.
3. the preparation method of base iron load type mixed ash adsorbent according to claim 2, which is characterized in that described mixed
Closing Fe (II)+Fe (III) total mol concentration in Fe-base Solution is 0.5~1.5moL/L；OH in the basis aqueous caustic-
Molar concentration is 1.5~7.5moL/L, CO3 2-Molar concentration is 0.3~3moL/L.
4. the preparation method of base iron load type mixed ash adsorbent according to claim 1, which is characterized in that the step
Suddenly the milling time of blast-furnace cinder is 1~3h in (2).
5. the preparation method of base iron load type mixed ash adsorbent according to claim 1, which is characterized in that the step
Suddenly mixing time is 5~10min in (2).
6. base iron load type mixed ash sorbent preparation method according to claim 1, which is characterized in that the step
(3) stirring rate is 30~60rpm in, and mixing time is 10~30min.
7. base iron load type mixed ash sorbent preparation method according to claim 1, which is characterized in that the step
(5) stirring rate is 50~80rpm in, and mixing time is 10~30min.
8. base iron load type mixed ash sorbent preparation method according to claim 1, which is characterized in that the step
(5) vacuum drying vacuum degree is -100~0kPa in, and temperature is 30~120 DEG C.
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