CN109847256A - A kind of iron arsenate@polymer arsenic-fixing material and its preparation and arsenic-fixing method of arsenic-containing solution - Google Patents
A kind of iron arsenate@polymer arsenic-fixing material and its preparation and arsenic-fixing method of arsenic-containing solution Download PDFInfo
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Abstract
本发明属于有害废物处理技术领域，具体公开了一种砷酸铁@聚合物固砷材料，包括核以及包覆所述核的聚合物，所述的核为砷酸铁；所述的核进一步优选为硫化亚铁包覆的砷酸铁。本发明还提供了一种所述的砷酸铁@聚合物固砷材料的制备方法以及采用含砷废水制备所述的砷酸铁@聚合物固砷材料的方法。本发明发现，所述核‑壳结构的砷酸铁@聚合物固砷材料具有良好稳定性，特别是在碱性条件下的稳定性，有助于降低浸出毒性。The invention belongs to the technical field of hazardous waste treatment, and specifically discloses an iron arsenate@polymer solid arsenic material, comprising a core and a polymer coating the core, wherein the core is iron arsenate; the core further Ferrous arsenate coated with ferrous sulfide is preferred. The present invention also provides a method for preparing the iron arsenate@polymer arsenic solid material and a method for preparing the iron arsenate@polymer arsenic solid material by using arsenic-containing wastewater. It is found in the present invention that the iron arsenate@polymer solid arsenic material of the core-shell structure has good stability, especially the stability under alkaline conditions, which helps to reduce the leaching toxicity.
Description
Technical field
The invention belongs to field of environmental improvement, and in particular to a kind of processing method of arsenic containing solution.
Background technique
Arsenic is a kind of toxic element, in the earth's crust mainly with the indissolubles arsenate such as calcium, iron, manganese, aluminium of low toxicity and realgar,
Orpiment, the form stable of mispickel sulfides are present in rock stratum and soil.The mankind are during mineral resource development and utilization, arsenic
Natural stability form destroyed and released the water-soluble arsenic of high poison, the height especially generated in nonferrous metallurgical process
Concentration arsenic-containing waste water has become one of the main path of release high poison arsenic.In recent years, in China Hunan, Guangxi, Guizhou, cloud
A lot of regional arsenic poisoning events have occurred in the nonferrous smeltings industry dense region such as south, and arsenic pollution has become social extensive concern
Tender subject.To this kind of high arsenic Metallurgical Waste Water, processing method reported in the literature has chemical precipitation method, ion-exchange, absorption
Method, extraction and biochemical method [etc., but only chemical precipitation method can be applied at industrial scale at present.Chemical precipitation
The basic principle of method is the indissoluble arsenate that the high poison arsenic of solution state is changed into low toxicity, and by security landfill back to greatly certainly
In so.Chemical precipitation method require indissoluble arsenate precipitating to have arsenic removal is high-efficient, solid arsenic safety is good, and cost it is more low more
It is good.According to China's national standard, the remaining arsenic concentration in arsenic removal rear solution is required to be reduced to 50 micrograms in terms of arsenic removal efficiency
Every liter, Gu arsenic safety is then evaluated by toxicity leaching experiment (TCLP), it is desirable that and leachate arsenic concentration is less than 5 milligrams per liter.
Currently, only calcium arsenate and two class indissoluble arsenate of ferric arsenate can better meet above-mentioned requirements.Calcium arsenate and
Ferric arsenate is substantially similar on arsenic removal process, and the molysite depositions such as lime or ferric sulfate are added by certain C a/As ratio or Fe/As ratio
The calcium arsenate and precipitated ferric arsenate of indissoluble can be obtained after neutralizer adjustment pH value is added in agent.It is high for acid concentration useless containing arsenic
Water makees neutralizer using lime, consolidates arsenic using the calcium arsenate of generation, is the common method of current enterprise, but the water after arsenic removal
CaS0 in solution4Content is higher, and subsequent processing is very troublesome.The integrated operation cost of usual calcium arsenate arsenic removal is lower than ferric arsenate,
However ferric arsenate the high efficiency of arsenic removal, solid arsenic safety in terms of have a clear superiority.The solubility in water of ferric arsenate
(AB type refractory tungsten alloys, solubility product 10-21~10-24Left and right, solubility about 10-nMolL-4 is than calcium arsenate (A2B3 type indissoluble electricity
Xie Zhi, solubility product 10—18~10—21, solubility about 10—5MolL-^ is about 1,000,000 times small, while in arsenic acid calcium salt and air
Carbon dioxide exposure after form calcium carbonate and water-soluble arsenic acid, lead to " the anti-molten phenomenon " of arsenic and there are security hidden troubles.
Since the popularization and application of ferric arsenate are there are Cost Obstacles, domestic smelter would rather select the calcium arsenate with security risk mostly
Arsenic removal.And by the arsenic removal cost of ferric arsenate be greatly reduced with the comparable level of calcium arsenate, need disappearing molysite deposition agent
Consumption drop amount cuts down more than half, that is, needs to be down to Fe/As ratio within 2 from 4 or so from technique.Ferric arsenate alkali resistance is not
It is good, it is easy to happen hydrolysis under alkaline condition and generates iron oxygen hydrate, causes " the anti-molten phenomenon " of arsenic, influences arsenic fixation effect.
Summary of the invention
There is solid the defects of arsenic is at high cost, arsenic fixation effect is poor for existing As retention, the first object of the present invention is,
A kind of ferric arsenate@polymer is provided and consolidates arsenic material, it is intended to reduce the Leaching of solid arsenic material.
Second purpose of the invention is that the ferric arsenate@polymer for providing a kind of inexpensive, efficient arsenic admittedly consolidates the system of arsenic material
It is particularly preferred with core that stability can be made by the arsenic in arsenic containing solution by the technique of simple low cost in Preparation Method, this method
The ferric arsenate@polymer of shell structure consolidates arsenic material, realizes that the method for arsenic is consolidated in one-pass molding, realizes being permanently fixed for arsenic.
Third purpose of the present invention is, provides a kind of using the preparation method, and the arsenic in arsenic-containing waste water is converted to
The ferric arsenate@polymer consolidates the Arsenic fixation method of arsenic material.
A kind of ferric arsenate@polymer consolidates arsenic material, and the polymer including core and the cladding core, the core is arsenic acid
Iron.
It is a discovery of the invention that the ferric arsenate@polymer of the nucleocapsid structure consolidates arsenic material with good stability, especially
Stability under alkaline condition helps to reduce Leaching.
Preferably, the core is the ferric arsenate that surface is coated with FeS layer.Currently preferred material, including
Ferric arsenate is coated on the ironing surface FeS layer of arsenic acid, and is coated on the polymer of ferrous sulfide layer surface.Research hair
Existing, the Leaching of the preferred material is smaller, and stability is higher.
Preferably, the ferric arsenate@polymer consolidates arsenic material comprising polymeric substrates, and be embedded in described
Core in polymeric substrates.
Preferably, the polymer is hydrophilic polymer, further preferably polyvinyl alcohol；Molecular weight is preferably
1000~10000.
Preferably, polymer volume is 1~10 the percent of arsenic acid weight of iron.
The present invention also provides the preparation methods that the ferric arsenate@polymer described in one kind consolidates arsenic material, by the core material
Material dispersion in a polymer solution, remove solvent to get.
Preferably, the core is ferric arsenate, by arsenic containing solution through solid arsenic processing, precipitated ferric arsenate is obtained.
Preferably, solid arsenic processing step are as follows: be pre-adjusted arsenic containing solution pH be adjusted to acidity after, be then added ferrous
Salt and it is passed through oxygen-containing gas, be stirred to react in a heated condition, separation of solid and liquid obtains precipitated ferric arsenate.
Arsenic in arsenic containing solution of the present invention is pentavalent arsenic；It can be the arsenic-containing waste water of metallurgical industry generation, or contain
The arsenic leaching solution of arsenic flue dust and/or slag.
The method of the present invention is generally adapted in the smelting processes such as the various smelting waste liquids containing arsenic or lead, zinc, antimony, copper, tin produce
The arsenic leaching solution of the metallurgical wastes such as the high arsenic content anode slurry generated in the electrolytic processes such as raw high-arsenic dust and lead bullion, silver, copper.
The method of the present invention does not require the arsenic content in arsenic containing solution.In arsenic containing solution arsenic content be, for example, 5~50 grams/
It rises.
Technical solution of the present invention key is for arsenic to be converted to the preferable ferric arsenate of stability, further in ferric arsenate
Surface Creation polymeric layer, protects ferric arsenate, forms a kind of special Core-shell structure material, can effectively realize containing arsenic
Arsenic in waste liquid or arsenic leaching solution is permanently fixed, and prevents the arsenic dissolution after fixing from causing secondary pollution.
In the present invention, the arsenic in arsenic containing solution is converted to ferric arsenate by solid arsenic means conducive to subsequent polymer packet
It covers.
Preferably, solid arsenic processing step are as follows: be pre-adjusted arsenic containing solution pH be adjusted to acidity after, be then added ferrous
Salt and it is passed through oxygen-containing gas, be stirred to react in a heated condition, separation of solid and liquid obtains precipitated ferric arsenate.The study found that using should
The ferric arsenate that Arsenic fixation method obtains has good octahedra crystalline form, can unexpectedly be conducive to sequent surface and etch to be formed
Fine and close ferrous sulfide clad.
Preferably, arsenic containing solution pH is adjusted to 1~3；Further preferably 1~2.Adjust pH using sulfuric acid solution and/
Or sodium hydroxide solution.
Preferably, ferrous salt is Fe2+Water soluble salt；Further preferably ferrous sulfate, frerrous chloride, ferrous nitrate
At least one of.
Preferably, additional amount of the ferrous salt in arsenic containing solution is 1.2~5 times of arsenic mol in arsenic containing solution；Into
One step is preferably 1.5~3 times.
Preferably, the oxygen-containing gas is oxygen and/or air.
Preferably, the flow velocity of oxygen-containing gas be 0.1~5 liter/per minute.
Preferably, the temperature of solid arsenic treatment process is 70~95 DEG C；Gu it is preferably 6~12 hours that arsenic, which handles the time,.?
It is, ferrous salt is added in the arsenic containing solution and is passed through oxygen-containing gas, is again heated to 70~95 DEG C, is stirred to react 6~12
Hour, separation of solid and liquid obtains ferric arsenate solid.
Preferably, the core is the ferric arsenate that surface is coated with FeS layer, preparation process are as follows: by ferric arsenate
Precipitating be placed in concentration be 0.001~0.2moL/L vulcanization salting liquid in and 5~40 DEG C at a temperature of carry out surface etch,
The nuclear material is made in arsenic acid deposition of iron ferrous sulfide.
In the present invention, innovatively the surface in situ by surface sculpture method in obtained ferric arsenate forms ferrous sulfide packet
Coating；During forming the clad, needs to solve ferric arsenate corrosion existing for surface etch process and clad causes
The problem of close property difference.To solve this problem, the research of the invention finds that, can be by by the concentration and temperature of the sulphurizing salt of etching process
Degree control is so conducive to successfully obtain the good ferrous sulfide clad of compactness under required range；Cooperation is described to gather
The effect for closing beyond the region of objective existence layer, can further promote the stability of solid arsenic material.
Preferably, vulcanization salinity is 0.001~0.1moL/L.Control, can be further under the preferred range
The compactness for improving the ferrous sulfide of cladding, further promotes its leaching safety under alkaline condition.
Preferably, vulcanization salting liquid is ionizable S out2-Water soluble salt aqueous solution；The ionizable S out2-Water
Soluble is more preferably at least one of vulcanized sodium, potassium sulfide, sodium bisulfide, potassium hydrogen sulfide.
Preferably, the temperature of surface etch process is 10~20 DEG C；It is still more preferably 10~15 DEG C.Research hair
It is existing, it controls at the preferred temperature, can further improve the compactness of the ferrous sulfide of cladding, further promote it in alkali
Leaching safety under the conditions of property.
The surface etch time is preferably 1~24 hour.
The nuclear material is placed in the solution of polymer by the present invention, is placed it in mold, and solvent is then removed, and is obtained
Consolidate arsenic material to the ferric arsenate@polymer.
Preferably, the polymer is polyvinyl alcohol；The dosage of preferred polyvinyl alcohol is percent the 1 of nuclear mass
~10.
Preferably, it is 0.5~2 that the core, which is immersed in the time stirred in 95~100 degrees Celsius of polyvinyl alcohol water solutions,
Hour.
Preferably, mould material is metal class, iron etc..
Technical solution of the present invention bring advantageous effects:
1, the present invention innovatively provides a kind of ferric arsenate@polymer and consolidate arsenic material, and the discovery compound and packet
The material for covering pattern has good leaching safety；
2, it has also been found that, in advance in one layer of iron sulfide of the surface etch of ferric arsenate, one layer of polymeric is further coated,
Facilitate the leaching safety for further promoting solid arsenic material；
3, by toxicity leaching experiment (TCLP), according to " solid waste Leaching leaching method horizontal vibration method
HJ557-2010 " regulation tested, the results showed that in leachate arsenic concentration be lower than " hazardous waste judging standard Leaching
Identify GB5085.3-2007 " in defined 5 mg/litres, meet safety consolidate arsenic compound standard.
4, technical solution of the present invention realizes the fixation of arsenic by two-step method, and reaction condition is mild, and step is simple；And it uses
Solid arsenic raw material be ferrous salt, air or oxygen etc., it is cheap, be conducive to promote and apply；Preparation with core-shell structure
Ferric arsenate/polyvinyl alcohol material illustrates that it is safe and reliable by toxicity characteristic leaching procedure, can be used as preferably arsenic material admittedly, solves mesh
The arsenic pollution problem of preceding smelter.
Detailed description of the invention
[Fig. 1] is specific flow chart of the present invention；
[Fig. 2] is the X-ray powder diffraction figure that core-shell structure consolidates arsenic material in the embodiment of the present invention 1；
[Fig. 3] is that core-shell structure consolidates arsenic scanning of materials electron microscope in the embodiment of the present invention 1.
Specific embodiment
Following embodiment is intended to illustrate summary of the invention, rather than further limits to the scope of the present invention.This hair
Raw material arsenic-containing water solution used by bright is derived from the high-arsenic dust leachate of institute, Hunan tellurium smeltery output, leachate preparation side
Method is prepared according to patent " a kind of high arsenic metallurgical waste gradient arsenic removing method " (patent No. 201110379510).By ICP come
It determines the content of arsenic in solution, and adjusts the concentration of arsenic in solution by evaporating or being diluted with water.
Toxicity leaching experiment (TCLP), according to " solid waste Leaching leaching method horizontal vibration method HJ557-2010 "
Regulation, prepared ferric arsenate/polyvinyl alcohol Core-shell structure material is added in distilled water, solid-to-liquid ratio be 1 to 10, level
Concussion 8 hours is filtered and is collected leachate after standing 16 hours, test leachate using plasma direct-reading spectrometer (ICP)
The concentration of middle arsenic.
Embodiment 1
The arsenic containing solution for preparing 1 liter of 30 grams per liter according to the method described above adjusts pH value of solution to 1 using the concentrated sulfuric acid.According to iron arsenic
Molar ratio 1.5 weighs 166.83 grams of green vitriol, is added in solution and solution is kept to stir.It is passed through into solution
Oxygen, flow velocity are 0.5 liter/min.Solution is heated to 90 degrees Celsius, is kept stirring and reacts 7 hours with logical oxygen.It is cold to solution
But it filtering afterwards, precipitating is washed with deionized, and it is dry, obtain shallow green powder solid.And use plasma direct-reading spectrometer
(ICP) arsenic content after reacting in solution is tested, it is 99.6% that heavy arsenic rate, which is obtained by calculation,.By obtained solid powder
It is soaked in 95 degrees Celsius of polyvinyl alcohol water solutions that quality is arsenic acid weight of iron percent 10 and stirs 0.5 hour, by polyethylene
Alcohol solution pours into cuboid irony mold, pours out after heating evaporating water, obtains green brick solid, this is target production
Object.X-ray powder diffraction finally has been carried out to product and field emission scanning electron microscope is tested, Fig. 2 is the X that core-shell structure consolidates arsenic material
Ray powder diffraction pattern, as can be seen from the figure material prepared is the compound of two hydration ferric arsenates and polyvinyl alcohol really；
Fig. 3 is that core-shell structure consolidates arsenic scanning of materials electron microscope, and material surface forms one layer of particle composition as we can clearly see from the figure
Shell shows that material is Core-shell structure material.
Embodiment 2
The arsenic containing solution for preparing 1 liter of 10 grams per liter according to the method described above adjusts pH value of solution to 1 using the concentrated sulfuric acid.According to iron arsenic
Molar ratio 2 weighs 74.15 grams of green vitriol, is added in solution and solution is kept to stir.Oxygen is passed through into solution
Gas, flow velocity are 2 liters/min.Solution is heated to 80 degrees Celsius, is kept stirring and reacts 9 hours with logical oxygen.After solution is cooling
Filtering, precipitating are washed with deionized, dry, obtain shallow green powder solid (ferric arsenate solid).And use plasma direct-reading
Spectrometer (ICP) tests the arsenic content after reaction in solution, and it is 99.4% that heavy arsenic rate, which is obtained by calculation,.It will be obtained solid
Body powder is soaked in 95 degrees Celsius of polyvinyl alcohol water solutions that quality is arsenic acid weight of iron percent 5 and stirs 1 hour, by poly- second
Enol aqueous solution pours into cylindrical wax mold, pours out after heating evaporating water, obtains green circular cylindrical solid, this is target
Product.
Embodiment 3
The arsenic containing solution for preparing 1 liter of 50 grams per liter according to the method described above adjusts pH value of solution to 2 using the concentrated sulfuric acid.According to iron arsenic
Molar ratio 3 weighs 397.62 grams of Iron dichloride tetrahydrate, is added in solution and solution is kept to stir.Sky is passed through into solution
Gas, flow velocity are 5 liters/min.Solution is heated to 70 degrees Celsius, is kept stirring and reacts 12 hours with logical oxygen.It is cooling to solution
After filter, precipitating is washed with deionized, dry, obtains shallow green powder solid.And use plasma direct-reading spectrometer (ICP)
The arsenic content after reacting in solution is tested, it is 99.5% that heavy arsenic rate, which is obtained by calculation,.Obtained solid powder is impregnated
It is stirred 2 hours in 95 degrees Celsius of polyvinyl alcohol water solutions that quality is arsenic acid weight of iron percent 1, by polyvinyl alcohol water solution
It pours into square polytetrafluoroethylene (PTFE) matter mold, is poured out after heating evaporating water, obtain green brick solid, this is target production
Object.
Embodiment 4
It is compared with embodiment 1, difference is, etches one layer of ferrous sulfide again on the surface of iron sulfide precipitates obtained.
Obtained ferric arsenate solid powder is soaked in the vulcanization that temperature is 5 DEG C, molar concentration is 0.003 mole every liter
It 20 hours in sodium solution, is filtered, washed, dries, obtain red powder, this is target product (ferric arsenate@ferrous sulfide material；
The octahedra clad structure that crystalline form and partial size are 10~50 microns of diameter)；
95 degrees Celsius of polyvinyl alcohol water solutions that the ferric arsenate@ferrous sulfide material of acquisition is soaked in be (polyvinyl alcohol
Content is the 5% of ferric arsenate@ferrous sulfide material) middle stirring 1 hour, polyvinyl alcohol water solution is poured into cylindrical wax mold
It is interior, it is poured out after heating evaporating water, obtains green circular cylindrical solid, this is target product.
Embodiment 5
It is compared with embodiment 1, difference is, etches one layer of ferrous sulfide again on the surface of iron sulfide precipitates obtained.
Obtained ferric arsenate solid powder is soaked in the vulcanization that temperature is 40 DEG C, molar concentration is 0.2 mole every liter
It 1 hour in sodium solution, is filtered, washed, dries, obtain red powder, this is target product (ferric arsenate@ferrous sulfide material；It is brilliant
The octahedra clad structure that shape and partial size are 10~50 microns of diameter)；
95 degrees Celsius of polyvinyl alcohol water solutions that the ferric arsenate@ferrous sulfide material of acquisition is soaked in be (polyvinyl alcohol
Content is the 5% of ferric arsenate@ferrous sulfide material) middle stirring 1 hour, polyvinyl alcohol water solution is poured into cylindrical wax mold
It is interior, it is poured out after heating evaporating water, obtains green circular cylindrical solid, this is target product.
Embodiment 6
It is compared with embodiment 1, difference is, etches one layer of ferrous sulfide again on the surface of iron sulfide precipitates obtained.
Obtained ferric arsenate solid powder is soaked in the vulcanization that temperature is 15 DEG C, molar concentration is 0.1 mole every liter
It 3 hours in sodium solution, is filtered, washed, dries, obtain red powder, this is target product (ferric arsenate@ferrous sulfide material；It is brilliant
The octahedra clad structure that shape and partial size are 10~50 microns of diameter)；
95 degrees Celsius of polyvinyl alcohol water solutions that the ferric arsenate@ferrous sulfide material of acquisition is soaked in be (polyvinyl alcohol
Content is the 5% of ferric arsenate@ferrous sulfide material) middle stirring 1 hour, polyvinyl alcohol water solution is poured into cylindrical wax mold
It is interior, it is poured out after heating evaporating water, obtains green circular cylindrical solid, this is target product.
Embodiment 7
It is compared with embodiment 6, difference is, one layer of ferrous sulfide is etched again on the surface of iron sulfide precipitates obtained, and
The temperature of etching process is 60 DEG C.
The temperature of etching process is higher, does not obtain the arsenic acid iron material that surface is coated with ferrous sulfide, polymer overmold
Material is similar with Examples 1 to 3.
Embodiment 8
It is compared with embodiment 6, difference is, one layer of ferrous sulfide is etched again on the surface of iron sulfide precipitates obtained, and
The concentration that etching process vulcanizes salting liquid is 0.5moL/L.
The temperature of etching process is higher, does not obtain the arsenic acid iron material that surface is coated with ferrous sulfide, polymer overmold
Material is similar with Examples 1 to 3.
Comparative example 1
It is compared with embodiment 1, difference is only that, does not carry out polymer overmold.
The product of above embodiments 1~8 and comparative example is according to " solid waste Leaching leaching method horizontal oscillations
Method HJ557-2010 " regulation carry out toxicity characteristic leaching procedure, as a result arsenic concentration is below 5 mg/litres in leachate, hence it is evident that is better than
Relevant criterion.
| Case | The leachate arsenic concentration of alkali leaching |
| Embodiment 1 | 1.6 milligrams per liter |
| Embodiment 2 | 1.9 milligrams per liter |
| Embodiment 3 | 2.1 milligrams per liter |
| Embodiment 4 | 0.6 milligrams per liter |
| Embodiment 5 | 1.1 milligrams per liter |
| Embodiment 6 | 0.1 milligrams per liter |
| Embodiment 7 | 1.8 milligrams per liter |
| Embodiment 8 | 2.3 milligrams per liter |
| Comparative example 1 | 40 milligrams per liter |
It is tested by alkaline leaching, uncoated arsenic acid iron material can be dissolved in alkaline solution, and arsenic is dense in leachate
Degree is much larger than 5 mg/litres；And arsenic concentration is below 5 mg/litres in the material extract after coating, and is safe solid waste,
It is safe solid arsenic material.
By embodiment 4~6 and Examples 1 to 3 and embodiment 7,8 it was found that, it is former on the surface of ferric arsenate in advance
Position etching forms ferrous sulfide, then coated polymer, can further be obviously improved leaching stability.Especially in embodiment 6
Preferred range under, fine and close FeS layer can be formed, help further to promote alkali and soak stability.
Claims (10)
1. a kind of ferric arsenate@polymer consolidates arsenic material, which is characterized in that the polymer including core and the cladding core, it is described
Core be ferric arsenate.
2. ferric arsenate@polymer as described in claim 1 consolidates arsenic material, which is characterized in that the core is coated with for surface
The ferric arsenate of FeS layer.
3. ferric arsenate@polymer as described in claim 1 consolidates arsenic material, which is characterized in that the polymer is hydrophily
Polymer, preferably polyvinyl alcohol；
Preferably, polymer volume is 1~10 the percent of arsenic acid weight of iron.
4. the preparation method that a kind of described in any item ferric arsenate@polymer of claims 1 to 3 consolidate arsenic material, which is characterized in that
In a polymer solution by the described nuclear material dispersion, remove solvent to get.
5. the preparation method that ferric arsenate@polymer as claimed in claim 4 consolidates arsenic material, which is characterized in that the core is
Ferric arsenate obtains precipitated ferric arsenate by arsenic containing solution through solid arsenic processing.
6. the preparation method that ferric arsenate@polymer as claimed in claim 5 consolidates arsenic material, which is characterized in that Gu arsenic processing step
Suddenly are as follows: be pre-adjusted arsenic containing solution pH be adjusted to acidity after, be then added and ferrous salt and be passed through oxygen-containing gas, in heating condition
Under be stirred to react, separation of solid and liquid obtain precipitated ferric arsenate；
Preferably, adjusting arsenic containing solution pH is 1~3；
Preferably, ferrous salt Fe2+Water soluble salt, preferably at least one of ferrous sulfate, frerrous chloride, ferrous nitrate；
Preferably, additional amount of the ferrous salt in arsenic containing solution is 1.2~5 times of arsenic mol in arsenic containing solution；
Preferably, the oxygen-containing gas is oxygen and/or air；The preferred flow velocity of oxygen-containing gas be 0.1~5 liter/per minute；
Preferably, Gu the temperature of arsenic treatment process is 70~95 DEG C, Gu the arsenic processing time is preferably 6~12 hours.
7. the preparation method that ferric arsenate@polymer as claimed in claim 6 consolidates arsenic material, which is characterized in that described contains arsenic
Solution is the arsenic leaching solution of the arsenic-containing waste water that metallurgical industry generates or arsenic-containing smoke dust and/or slag；
Preferably, arsenic content is 5~50 grams per liters in the arsenic-containing water solution.
8. as the described in any item ferric arsenate@polymer of claim 4~7 consolidate the preparation method of arsenic material, which is characterized in that institute
The core stated is the ferric arsenate that surface is coated with FeS layer, preparation process are as follows: it is 0.001 that precipitated ferric arsenate, which is placed in concentration,
In the vulcanization salting liquid of~0.2moL/L and 5~40 DEG C at a temperature of carry out surface etch, in arsenic acid deposition of iron ferrous sulfide,
The nuclear material is made.
9. the preparation method that ferric arsenate@polymer as claimed in claim 8 consolidates arsenic material, which is characterized in that
Vulcanization salting liquid is preferably ionizable S out2-Water soluble salt aqueous solution；The ionizable S out2-Water soluble salt it is preferred
For at least one of vulcanized sodium, potassium sulfide, sodium bisulfide, potassium hydrogen sulfide；
Vulcanization concentration of salt solution is 0.001~0.1moL/L；
The temperature of surface etch process is 10~20 DEG C；
The surface etch time is preferably 1~24 hour.
10. a kind of Arsenic fixation method of arsenic containing solution, which is characterized in that use the described in any item preparation sides of claim 4~9
Arsenic therein is converted to the ferric arsenate@polymer and consolidates arsenic material by method.
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| CN111808218A (en) * | 2020-07-17 | 2020-10-23 | 中国科学院沈阳应用生态研究所 | A kind of solid waste stabilizer and its preparation method and application |
| CN111908653A (en) * | 2020-07-13 | 2020-11-10 | 矿冶科技集团有限公司 | Slow-release arsenic and antimony removal medicament, preparation method thereof and method for deeply treating heavy metal wastewater by adopting slow-release arsenic and antimony removal medicament |
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| CN111808218A (en) * | 2020-07-17 | 2020-10-23 | 中国科学院沈阳应用生态研究所 | A kind of solid waste stabilizer and its preparation method and application |
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