CN107129018A - The method for concentration of arsenic in a kind of arsenic-containing waste water - Google Patents
The method for concentration of arsenic in a kind of arsenic-containing waste water Download PDFInfo
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- CN107129018A CN107129018A CN201710501532.7A CN201710501532A CN107129018A CN 107129018 A CN107129018 A CN 107129018A CN 201710501532 A CN201710501532 A CN 201710501532A CN 107129018 A CN107129018 A CN 107129018A
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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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/727—Treatment of water, waste water, or sewage by oxidation using pure oxygen or oxygen rich gas
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention provides a kind of method for concentration of arsenic in arsenic-containing waste water, comprise the following steps：Arsenic-containing waste water is mixed into the heavy arsenic of progress with divalent iron salt, mixed system is obtained；The pH value of the heavy arsenic is 2~7；By the mixed system separation of solid and liquid, solid product is obtained；By solid product acid adding dissolving.The method that the present invention is provided reacts arsenic-containing waste water and divalent iron salt under suitable pH value condition, arsenic is set to be precipitated in the form of ferrous arsenate or arsenious acid are ferrous, obtained ferrous arsenate or the ferrous acid adding of arsenious acid are returned again molten, so that arsenic is enriched with and concentrated, the arsenic containing solution of high concentration is obtained.Embodiment shows, the available high concentration arsenic containing solution of method for concentration that the present invention is provided, and the arsenic content in arsenic containing solution is easily adjusted, and is conducive to the further stabilization processes containing arsenic waste solution.
Description
Technical field
The present invention relates to a kind of technical field of wastewater treatment, the method for concentration of arsenic in more particularly to a kind of arsenic-containing waste water.
Background technology
Arsenic is a kind of toxic element, mainly in the form of sulfide exist and association in other metals such as：Gold, copper, lead,
In the mineral of the formation such as nickel, cobalt, zinc, a large amount of high (low) arsenic can be produced during nonferrous smelting and sulfuric acid industry flue gas acid preparing and are given up
Water.Arsenic in these arsenic-containing waste waters must be removed with stable compound, therefore, arsenic in non-ferrous metal metallurgy research project field
Removal and technique for fixing be always research focus.
At present, the treatment technology of the conventional arsenic-containing waste water of China has arsenones depositing technology, iron arsenic coprecipitation technology and knot
Crystalline substance-precipitated ferric arsenate technique.The arsenic sulfide slag and its unstable that wherein arsenones depositing technology is produced；Iron arsenic coprecipitation is because of it
Higher iron arsenic mol ratio (>=4:1) a large amount of unstable arsenic-containing waste residues can, be produced；Iron arsenic rubs in crystallization-precipitated ferric arsenate method
That ratio about 1:1, compared with iron arsenic coprecipitation method, the arsenic-containing waste residue amount that crystallization-precipitated ferric arsenate technique is produced is small and has
Higher stability, but crystallization ferric arsenate precursor liquid to arsenic concentration require it is higher, low arsenic waste water be unable to Direct precipitation crystallization-
Ferric arsenate.
The content of the invention
In view of this, present invention aims at the method for concentration for providing arsenic in a kind of arsenic-containing waste water, present invention offer is used
Method the arsenic-containing waste water of low arsenic content can effectively be concentrated, obtain being capable of the high arsenic of Direct precipitation crystallization-ferric arsenate
Precursor liquid, can substantially reduce the yield of the solid waste containing arsenic during follow-up arsenic admittedly.
In order to realize foregoing invention purpose, the present invention provides following technical scheme：
The invention provides a kind of method for concentration of arsenic in arsenic-containing waste water, comprise the following steps：
Arsenic-containing waste water is mixed into the heavy arsenic of progress with divalent iron salt, mixed system is obtained；The pH value of the heavy arsenic is 2~7；
By the mixed system separation of solid and liquid, solid product is obtained；
By solid product acid adding dissolving.
It is preferred that, the mol ratio of total arsenic is 0.5~4 in the divalent iron salt and arsenic-containing waste water:1.
It is preferred that, the mol ratio of total arsenic is 1~3 in the divalent iron salt and arsenic-containing waste water:1.
It is preferred that, the divalent iron salt is the one or more in ferrous sulfate, frerrous chloride and ferrous nitrate.
It is preferred that, the time of the heavy arsenic is 0.1~3h.
It is preferred that, the acid is the one or more in sulfuric acid, hydrochloric acid and nitric acid.
It is preferred that, the arsenic-containing waste water also includes before being mixed with divalent iron salt：
Arsenic-containing waste water and oxidant are mixed, oxidation reaction is carried out.
It is preferred that, the oxidant is the one or more in hydrogen peroxide, ozone and oxygen.
It is preferred that, the mol ratio of trivalent arsenic is 1.0~3 in the oxidant and arsenic-containing waste water:1.
It is preferred that, the time of the oxidation reaction is 0.1~3h.
The invention provides a kind of method for concentration of arsenic in arsenic-containing waste water, comprise the following steps：By arsenic-containing waste water and two
The mixing of valency molysite carries out heavy arsenic, obtains mixed system；The pH value of the heavy arsenic is 2~7；By the mixed system separation of solid and liquid,
Obtain solid product；The solid product acid adding is returned molten.The method that the present invention is provided will contain arsenic under suitable pH value condition
Waste water and divalent iron salt reaction, make arsenic be precipitated in the form of ferrous arsenate or arsenious acid are ferrous, then obtained arsenic acid is sub-
The ferrous acid adding of iron or arsenious acid is returned molten, so that arsenic is enriched with and concentrated, obtains the arsenic containing solution of high concentration.Embodiment table
Bright, arsenic content is only 10ppm or so in the filtrate obtained after the method separation of solid and liquid that the present invention is provided, illustrates the arsenic of the overwhelming majority
Precipitated in the form of ferrous arsenate or arsenious acid are ferrous, by controlling acid and ferrous arsenate and arsenous in acid adding course of dissolution
Sour ferrous ratio, is readily obtained the arsenic containing solution of various concentrations.
Brief description of the drawings
Fig. 1 is ESEM (SEM) figure for the precipitated ferric arsenate that the embodiment of the present invention 5 is obtained.
Embodiment
The invention provides a kind of method for concentration of arsenic in arsenic-containing waste water, comprise the following steps：
Arsenic-containing waste water is mixed into the heavy arsenic of progress with divalent iron salt, mixed system is obtained；The pH value of the heavy arsenic is 2~7；
By the mixed system separation of solid and liquid, solid product is obtained；
The solid product acid adding is returned molten.
In the present invention, the arsenic-containing waste water is the arsenic-containing waste water produced in industrial processes, and the present invention is to useless containing arsenic
Arsenic content in water does not have particular/special requirement, and arsenic content is relatively low, it is necessary to which the arsenic-containing waste water of concentration is included in scope of the present application.
Arsenic-containing waste water is mixed the heavy arsenic of progress with divalent iron salt by the present invention, obtains mixed system；The pH value of the heavy arsenic is 2
~7.In the present invention, the pH value of the heavy arsenic is preferably 3~6.In the present invention, the arsenic-containing waste water it is initial it is acid very
Height, pH value is extremely low, adjusts the pH value of arsenic-containing waste water to 2~7 present invention preferably uses pH adjusting agent, then mixed with divalent iron salt
Close and carry out heavy arsenic.In the present invention, regulation arsenic-containing waste water pH value with conditioning agent be preferably sodium hydroxide, calcium oxide, calcium carbonate and
One or more in calcium hydroxide, more preferably calcium oxide or calcium hydroxide.
In a particular embodiment of the present invention, if sulfuric acid content is higher in arsenic-containing waste water (>=10g/L), oxidation is preferably used
Calcium or calcium hydroxide remove the sulfate radical in arsenic-containing waste water the regulation for carrying out pH value again in the form of calcium sulfate, because calcium sulfate
Solubility it is more much smaller than calcium arsenate, thus generate calcium sulfate during larger shadow will not be caused to the arsenic in waste water
Ring, do not interfere with the concentration process of follow-up arsenic.
The pH value of arsenic-containing waste water is adjusted to required pH value, the present invention, which mixes divalent iron salt and arsenic-containing waste water, to be sunk
Arsenic, obtains mixed system.In the present invention, during the divalent iron salt is preferably ferrous sulfate, frerrous chloride and ferrous nitrate
It is one or more of；The mol ratio of total arsenic is preferably 0.5~4 in the divalent iron salt and arsenic-containing waste water:1, more preferably 1~3:1；
Most preferably 1.5~2.5:1；The time of the heavy arsenic is preferably 0.1~3h, more preferably 0.5h.
The present invention preferably adds divalent iron salt as an aqueous solution；The divalent iron salt aqueous solution is preferably added drop-wise to by the present invention
In arsenic-containing waste water；The present invention does not have particular/special requirement to the concentration of the divalent iron salt aqueous solution, the arsenic in waste water can be precipitated into complete
, heavy arsenic time of the invention since divalent iron salt be added dropwise to complete after calculate.
In the present invention, in the divalent iron salt and arsenic-containing waste water arsenic acid, arsenious acid reacts, and generates ferrous arsenate
Or arsenious acid ferrous precipitation, specific reaction equation is as follows：
3Fe2++2H3AsO3=Fe3(AsO3)2↓+6H+
3Fe2++2H2AsO4 -=Fe3(AsO4)2↓+4H+
In the present invention, during the divalent iron salt and arsenic-containing waste water react, hydrogen ion, system can be discharged
PH value can be declined slightly, the present invention pH value of system is preferably maintained 2~7 during the course of the reaction, the present invention it is specific
In embodiment, the preferably pH value of monitoring system during the course of the reaction, and add the regulation that conditioning agent carries out pH value thereto；It is described
Conditioning agent is consistent with such scheme, will not be repeated here.In the present invention, the pH value of system being maintained into 2~7 can ensure to contain
Arsenic in arsenic waste water farthest precipitates.
In the present invention, preferably also include before the arsenic-containing waste water is mixed with divalent iron salt：
Arsenic-containing waste water and oxidant are mixed, oxidation reaction is carried out.
The present invention mixes it with oxidant before arsenic-containing waste water is mixed with divalent iron salt progress oxidation reaction.In this hair
In bright, the oxidant is preferably the one or more in hydrogen peroxide, ozone and oxygen；Three in the oxidant and arsenic-containing waste water
The mol ratio of valency arsenic is preferably 1.0~3:1, more preferably 1.3:1；The time of the oxidation reaction is preferably 0.1~3h, more excellent
Elect 1h as；The present invention preferably carries out oxidation reaction at room temperature, without carrying out extra heating or cooling；The present invention passes through oxidation
Most trivalent arsenics in arsenic-containing waste water are oxidized to pentavalent arsenic by reaction, so that it is smaller that solubility is generated in subsequent reactions
Ferrous arsenate.
In a particular embodiment of the present invention, if sulfuric acid content is higher in arsenic-containing waste water (>=10g/L), oxygen is preferably first used
Change calcium or calcium hydroxide to remove sulfate radical in the form of calcium sulfate, then carry out again after the completion of oxidation reaction, oxidation reaction again
The pH value of arsenic-containing waste water is adjusted, is then reacted again with divalent iron salt.
Obtain after mixed system, mixed system is carried out separation of solid and liquid by the present invention, obtains solid product.The present invention is to solid-liquid
The method that separation is used does not have particular/special requirement, uses solid-liquid separating method well known to those skilled in the art.
Obtain after solid product, the present invention dissolves solid product acid adding.In the present invention, it is described acid be preferably sulfuric acid,
One or more in hydrochloric acid and nitric acid；The present invention does not have particular/special requirement to the volume of acid and the ratio of solid product quality,
In the specific embodiment of the present invention, arsenic concentration that can be in the concentrate containing arsenic according to needed for specific is determined；The present invention preferably will
The pH value control of dissolution system is 0.6~2.0, more preferably 1~1.5；The present invention does not have particular/special requirement to the concentration of acid, can
It is 0.6~2.0 by the pH value control of dissolution system.
In the present invention, the main component in the solid product is that ferrous arsenate and arsenious acid are ferrous, molten by acid adding
Arsenic during solution, ferrous arsenate and arsenious acid are ferrous can be reentered in liquid phase, so as to obtain arsenic containing solution；By controlling acid dense
Ratio of degree, acid and solid product etc. can easily control the arsenic concentration in liquid phase, in a particular embodiment of the present invention,
Arsenic content that can be in required arsenic containing solution selects different acid concentrations and the sour ratio with solid product.
In the present invention, if the pH value regulator used in abovementioned steps is calcium oxide or calcium hydroxide, the production of gained solid-state
A small amount of calcium arsenate can be contained in thing, when being dissolved using sulfuric acid to solid product, calcium sulfate precipitation can be produced, filtered
Removing；If being dissolved using hydrochloric acid, nitric acid to the solid product comprising calcium arsenate, calcium ion can be stayed in the liquid phase,
The residual of a small amount of calcium ion does not interfere with follow-up solid arsenic processing in arsenic containing solution.
In the present invention, the arsenic containing solution is that can obtain ferric arsenate to sink by simple air oxidation and hydrothermal crystallization
Form sediment, the present invention precipitates concrete technology and method to arsenic in arsenic containing solution does not have particular/special requirement, is known using those skilled in the art
Technique and method.
The method for concentration of arsenic is described in detail in the arsenic-containing waste water provided with reference to embodiment the present invention, still
They can not be interpreted as limiting the scope of the present invention.
Embodiment 1
Arsenic-containing waste water, wherein sulfur acid 50g/L, As (III)：1.5g/L, is squeezed into calcium oxide using peristaltic pump at room temperature
With sulfuric acid therein, calcium sulfate precipitation is separated off by separation of solid and liquid, H is added dropwise into waste water using peristaltic pump2O2, control
H2O2After being 1.2, oxidation reaction 1h with the mol ratio of trivalent arsenic, the pH for adjusting waste water with calcium oxide is 5.0, using peristaltic pump to
Solution of ferrous chloride is added in arsenic-containing waste water, the mol ratio for controlling Fe (II)/As is 1.6, after completion of dropping, continue to react
30min, the pH for controlling whole course of reaction is 5.0, obtains mixed system；By mixed system separation of solid and liquid, solid product is obtained
And filtrate；Solid product is returned with concentrated sulfuric acid solution it is molten, control sulfuric acid volume and solid product mass ratio be 20mL:1g,
The pH value that solution system is returned in regulation is 1.0, and separation of solid and liquid obtains gypsum and arsenic containing solution.
The arsenic content in arsenic containing solution is detected using atomic fluorescence spectrum, the arsenic in arsenic containing solution can be obtained
Concentration is 20g/L.
Arsenic content in gained filtrate (obtaining filtrate obtained by separation of solid and liquid after ferrous arsenate) is detected, must can be filtered
Arsenic concentration in liquid is only 10ppm, illustrates that arsenic most in waste water are all entered in solid phase, the arsenic in waste water is had
The enrichment and concentration of effect.
Embodiment 2
Arsenic-containing waste water, wherein sulfur acid 50g/L, As (III)：6.5g/L, is squeezed into calcium oxide using peristaltic pump at room temperature
With sulfuric acid therein, calcium sulfate precipitation is separated off by separation of solid and liquid, H is added dropwise into waste water using peristaltic pump2O2, control
H2O2After being 1.5, oxidation reaction 1h with the mol ratio of trivalent arsenic, the pH for adjusting waste water with calcium oxide is 5.5, using peristaltic pump to
Ferrous nitrate solution in arsenic-containing waste water, the mol ratio for controlling Fe (II)/As is 1.7, after completion of dropping, continues to react 30min, control
The pH for making whole course of reaction is 5.5, obtains mixed system；By mixed system separation of solid and liquid, solid product and filtrate are obtained；Will
Solid product returned with concentrated sulfuric acid solution it is molten, control sulfuric acid volume and solid product mass ratio be 12mL:Solution is returned in 1g, regulation
The pH value of system is 0.9, and separation of solid and liquid obtains gypsum and arsenic containing solution.
The arsenic content in arsenic containing solution is detected using atomic fluorescence spectrum, the arsenic in arsenic containing solution can be obtained
Concentration is 40g/L.
Embodiment 3
Arsenic-containing waste water, wherein sulfur acid 45g/L, As (III)：20mg/L, is squeezed into calcium oxide using peristaltic pump at room temperature
With sulfuric acid therein, calcium sulfate precipitation is separated off by separation of solid and liquid, oxygen is passed through into remaining liquid phase, oxygen is controlled
After being 1.5, oxidation reaction 2h with the mol ratio of trivalent arsenic, the pH that waste water is adjusted with sodium hydroxide is 7, using peristaltic pump to containing arsenic
Copperas solution in waste water, the mol ratio for controlling Fe (II)/As is 3.0:1, after completion of dropping, continue to react 1h, control whole
The pH of individual course of reaction is 6, obtains mixed system；By mixed system separation of solid and liquid, solid product and filtrate are obtained；Solid-state is produced
Thing returned with concentrated hydrochloric acid solution it is molten, control hydrochloric acid volume and solid product mass ratio be 40mL:The pH of solution system is returned in 1g, regulation
It is worth for 2.0, obtains arsenic containing solution.
The arsenic content in arsenic containing solution is detected using atomic fluorescence spectrum, the arsenic in arsenic containing solution can be obtained
Concentration is 10g/L.
Embodiment 4
Arsenic-containing waste water, wherein sulfur acid 20g/L, As (III)：20mg/L, is squeezed into calcium oxide using peristaltic pump at room temperature
With sulfuric acid therein, calcium sulfate precipitation is separated off by separation of solid and liquid, the pH that waste water is adjusted with sodium hydroxide is 2.0, is made
With peristaltic pump into arsenic-containing waste water solution of ferrous chloride, control Fe (II)/As mol ratio be 1:1, after completion of dropping, continue anti-
30min is answered, the pH for controlling whole course of reaction is 2.0, obtains mixed system；By mixed system separation of solid and liquid, solid-state production is obtained
Thing and filtrate；Solid product is returned with concentrated hydrochloric acid solution it is molten, control hydrochloric acid volume and solid product mass ratio be 35mL:
1g, the pH value that solution system is returned in regulation is 1.0, obtains arsenic containing solution.
The arsenic content in arsenic containing solution is detected using atomic fluorescence spectrum, the arsenic in arsenic containing solution can be obtained
Concentration is 10g/L.
Embodiment 5
The arsenic containing solution obtained in embodiment 1~4 is heated to 95 DEG C respectively, exposes into air, continues under agitation
8h is reacted, separation of solid and liquid is precipitated after the completion of reaction.
The SEM figures of gained precipitation sink as shown in figure 1, can be seen that precipitation according to Fig. 1 and include rod-like precipitates and graininess
Form sediment, wherein rod-like precipitates are calcium sulfate, and granular precipitate is ferric arsenate, illustrate that the calcium sulfate of doped portion in precipitated ferric arsenate sinks
Form sediment, it is the pH value that arsenic-containing waste water is adjusted using calcium oxide and calcium hydroxide to have the reason for calcium sulfate precipitation occurs, and what is obtained consolidates
Some calcium sulfate are had in body product, these calcium sulfate are entered eventually into concentrate containing arsenic, and in the mistake of precipitation ferric arsenate
It is precipitated out in journey, in the present invention, a small amount of calcium sulfate does not interfere with ferric arsenate synthesis.
Hazardous waste Leaching method of testing precipitated ferric arsenate to obtained by as specified in US EPA (TCLP)
Stability is detected that gained testing result is as shown in table 1：
The stability data of precipitated ferric arsenate prepared by the gained arsenic containing solution of 1 embodiment of table 1~4
According to table 1 as can be seen that obtaining arsenic containing solution using method for concentration of the present invention passes through simple air oxidation and water
Thermal crystalline is that can obtain precipitated ferric arsenate, and the TCLP arsenic concentrations in gained precipitated ferric arsenate are very low, can pass through US EPA's
The test of danger Leaching, it is stable solid waste to illustrate gained precipitated ferric arsenate, can safety discharge.
As seen from the above embodiment, the method for concentration of arsenic can be realized effectively to arsenic in the arsenic-containing waste water that the present invention is provided
Concentration, gained arsenic containing solution is beneficial to further heavy arsenic processing after concentration, can substantially reduce the cost of the solid arsenic of follow-up arsenic removal,
And the concentrating process step that the present invention is provided is simple, easily operation, cost is low, easily carries out industry chemical conversion production.
As seen from the above embodiment, it is only the preferred embodiment of the present invention that the present invention is described above, it is noted that for
For those skilled in the art, under the premise without departing from the principles of the invention, can also make it is some improvement and
Retouching, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. the method for concentration of arsenic, comprises the following steps in a kind of arsenic-containing waste water：
Arsenic-containing waste water is mixed into the heavy arsenic of progress with divalent iron salt, mixed system is obtained；The pH value of the heavy arsenic is 2~7；
By the mixed system separation of solid and liquid, solid product is obtained；
By solid product acid adding dissolving.
2. method for concentration according to claim 1, it is characterised in that total arsenic rubs in the divalent iron salt and arsenic-containing waste water
You are than being 0.5~4:1.
3. method for concentration according to claim 2, it is characterised in that total arsenic rubs in the divalent iron salt and arsenic-containing waste water
You are than being 1~3:1.
4. the method for concentration according to claim 1 or 2 or 3, it is characterised in that the divalent iron salt is ferrous sulfate, chlorine
Change the one or more in ferrous and ferrous nitrate.
5. method for concentration according to claim 1, it is characterised in that the time of the heavy arsenic is 0.1~3h.
6. method for concentration according to claim 1, it is characterised in that the acid is one kind in sulfuric acid, hydrochloric acid and nitric acid
Or it is several.
7. method for concentration according to claim 1, it is characterised in that the arsenic-containing waste water is gone back before being mixed with divalent iron salt
Including：
Arsenic-containing waste water and oxidant are mixed, oxidation reaction is carried out.
8. method for concentration according to claim 7, it is characterised in that the oxidant is in hydrogen peroxide, ozone and oxygen
One or more.
9. the method for concentration according to claim 7 or 8, it is characterised in that trivalent arsenic in the oxidant and arsenic-containing waste water
Mol ratio be 1.0~3:1.
10. the method for concentration according to claim 7 or 8, it is characterised in that the time of the oxidation reaction is 0.1~3h.
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| CN108423866A (en) * | 2018-02-13 | 2018-08-21 | 中南大学 | A method of the waste water containing trivalent arsenic prepares stable arsenic-containing solid material |
| CN114988600A (en) * | 2022-04-22 | 2022-09-02 | 中南大学 | Arsenic-uranium cooperative fixation processing method based on chemical mineralization |
| CN114988601A (en) * | 2022-04-22 | 2022-09-02 | 中南大学 | Method for strengthening uranium and arsenic mineralization and improving mineral stability |
| CN114988601B (en) * | 2022-04-22 | 2023-04-07 | 中南大学 | Method for strengthening uranium and arsenic mineralization and improving mineral stability |
| CN114988600B (en) * | 2022-04-22 | 2023-04-07 | 中南大学 | Arsenic-uranium cooperative fixation processing method based on chemical mineralization |
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