CN107350284A - A kind of efficient restorative procedure of mercury contaminated soil - Google Patents
A kind of efficient restorative procedure of mercury contaminated soil Download PDFInfo
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- CN107350284A CN107350284A CN201710702878.3A CN201710702878A CN107350284A CN 107350284 A CN107350284 A CN 107350284A CN 201710702878 A CN201710702878 A CN 201710702878A CN 107350284 A CN107350284 A CN 107350284A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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Abstract
The invention discloses a kind of efficient restorative procedure of mercury contaminated soil, mercury contaminated soil is first carried out oxidation processes by this method using acid persulfate solution, then soil pH is adjusted to more than 7, eluted successively using thiosulfate solution elution and organic acid with salt compounded of iodine mixed liquor again, finally eluted using vulcanized sodium and sodium hydroxide mixed liquor, this method can efficiently elute to a variety of valence state mercury in mercury contaminated soil, and mercury residual is low, and avoid causing environment secondary pollution, cost is low.
Description
Technical field
It is more particularly to a kind of to repair mercury contaminated soil by eluting the present invention relates to a kind of mercury contaminated soil restorative procedure
Method, belong to heavy metal soil remediation technology field.
Background technology
In recent years, developing rapidly with industrial or agricultural, mercury are largely discharged in the production and use process so that soil by
Mercury pollution situation is on the rise.The main source of Soil Mercury Pollution has atmospheric sedimentation, sewage irrigation, industrial pollution source (coal-fired, chlorine
The industries such as alkali industry, Battery Plant, smelting, papermaking), agricultural pollution source (use of agricultural chemicals and chemical fertilizer), mercury-containing wastes (temperature
Meter, refuse battery etc.) deal with improperly.Mercury and mercuric compounds in soil can enter human body by food chain, and pole is produced to human body
Big harm.Therefore, select suitable restorative procedure to carry out mercury contaminated soil reparation, China's environmental improvement, protection human body are good for
Health is significant.
Mercury is a kind of special heavy metal element, is in three kinds of valence states in soil：0 ,+1 valency ,+divalent.Mercury in soils is by change
Learning form can be divided into：Mercury metal, inorganic reference state mercury, organically combine state mercury.The mercury of inorganic states is mainly with the Hg of free state2+And Hg+Form is present, wherein, Hg+It can form slightly solubility mercury salt, and Hg2+It is mostly soluble mercury salt.The mercury of organic compound states of matter is with short
Based on alkyl group mercury, mercury with other small molecules or large biological molecule covalently to coordinate, with part by be coordinated or supermolecule in the form of knot
It is reference state to close formed state, and organomercurial compound is more sensitive to light and heat, there is higher volatility.
At present, mercury contaminated soil recovery technique mainly has soil moved in improve the original soil replacement method, heat treating process, curing/stabilizing method, elution
Method, electro reclamation, biological restoration etc..These methods have the shortcomings that respective.Such as：Soil moved in improve the original soil replacement method quantities is big, throws
Provide it is costly, destroy soil structures, cause soil fertility to decline, and also the dirty soil to swap out is stacked or handled；Heat
Facture need to consume the more energy, and investment cost is high, and too high temperature can destroy soil fertility；Curing/stabilizing method quilt
Fixed pollutant may discharge again with the change of condition, need long-term follow to monitor；Electro reclamation is for permeability
Higher sand effect is poor, and treatment conditions are harsh, and cost is high, biological restoration repairing efficiency length, and remediation efficiency is low.Leaching
The method of washing is to elute contaminated soil using leacheate (clear water or containing the solution that can improve mercury soluble reagents), solid phase of soil
In mercury be transferred to liquid phase of soil, obtain clean soil.Elution method can take out the mercury in soil, repair thoroughly, but only
Can remove can be leached the mercury of agent dissolving in soil, and ring waste easily causes secondary pollution.The key of elution method is to find
Efficient and environment-friendly eluent.
At present, fewer for the elution reparation relevant report of mercury contaminated soil, Chinese patent (CN106433649A) is public
Open using hydrochloric acid, the A agent of KI and hypo solution composition and the B of sodium hydroxide and liquor natrii hypochloritis's composition
The eluent combination of agent composition, the patent show that the elution efficiency of Mercury in Soil can be greatly improved by combining eluent substep elution, but
It is that hydrochloric acid acidity therein is stronger, the physicochemical property of meeting heavy damage soil, makes a large amount of loss of soil nutrient, cause soil can not
Recycle, while strong acidic condition requires higher to processing equipment, sodium thiosulfate, which meets strong acid, can react generation sulphur and titanium dioxide
Sulphur.Chinese patent (CN101362145A), which discloses, utilizes Na2Three kinds of EDTA, oxalic acid and KI agent combination substeps elute
Come the method realized the heavy metals such as cadmium in soil, copper, lead, zinc, arsenic and mercury while removed, the patent shows KI in soil
Mercury has higher clearance, reaches 40.1%, but its removal efficiency to mercury is relatively low.
The content of the invention
The defects of method repaired for the elution of mercury contaminated soil in the prior art is present, the purpose of the present invention is to be to carry
It can realize that a variety of valence state mercury efficiently elute in mercury contaminated soil for one kind, mercury residual is low, and secondary pollution degree is caused to environment
The method of low reparation mercury contaminated soil, the clearance of mercury in soils can reach more than 90% after scrubbed reparation, solve
The problem of typically mercury contaminated soil elution efficiency is not high.
In order to realize the purpose of the present invention, the invention provides a kind of efficient restorative procedure of mercury contaminated soil, this method bag
Include following steps：
1) mercury contaminated soil crushed, milled, sieved, take the lower mercury contaminated soil particulate of sieve；
2) add water moisturizing in mercury contaminated soil particulate, add oxidizing agent solution, stir and heat carry out oxidation processes；
3) pH to more than 7 of the mercury contaminated soil particulate after oxidation processes is adjusted；
4) thiosulfate solution elution is added, adds water wash；
5) add organic acid to elute with salt compounded of iodine mixed solution, add water wash；
6) add vulcanized sodium to elute with sodium hydroxide mixed solution, add water wash.
Preferable scheme, the oxidizing agent solution are persulfate solution.More preferably persulfate solution in scheme
Mass percent concentration is 0.1~1%.It can be improved as catalyst comprising appropriate amount of acid in the persulfate solution of the present invention
Oxidation efficiency, this be it will be appreciated by those skilled in the art that category.4% or so persulfate solution is such as added to 5%
HCl solution in, volume ratio 1:10.To guarantee the low price mercury such as the organic mercury in soil and monovalence mercury being completely converted into
Hg2+, the active ingredient in persulfate is somewhat excessive with respect to mercury element in mercury contaminated soil.
Preferable scheme, the mol ratio of the persulfate and mercury element in mercury contaminated soil are not less than 2:1.More preferably
Scheme, the persulfate include potassium peroxydisulfate and/or sodium peroxydisulfate.More preferably potassium peroxydisulfate.
Preferable scheme, the concentration of the thiosulfate solution is 0.01~0.3mol/L.More preferably scheme, it is described
Thiosulfate is included in sodium thiosulfate, potassium thiosulfate, ATS (Ammonium thiosulphate), calcium thiosulfate, magnesium thiosulfate at least
It is a kind of.More preferably sodium thiosulfate.
Preferable scheme, the concentration of the organic acid and organic acid in salt compounded of iodine mixed solution is 0.5~1mol/L, salt compounded of iodine
Concentration is 0.01~0.3mol/L；
More preferably scheme, the organic acid include at least one of citric acid, tartaric acid, oxalic acid；More preferably lemon
Acid.
More preferably scheme, the salt compounded of iodine include at least one of KI, sodium iodide, magnesium iodide, ammonium iodide；More preferably
For KI.
Preferable scheme, in the vulcanized sodium and sodium hydroxide mixed solution the mass percent concentration of vulcanized sodium for 5~
10%, sodium hydroxide quality is the 1~2% of vulcanized sodium quality.
Preferable scheme, in step 4) in thiosulfate solution lessivation, liquid-solid ratio 5:1~10:1mL/g, leaching
It is 3~12h to wash the time.
Preferable scheme, in step 5) organic acid with salt compounded of iodine mixed solution lessivation, liquid-solid ratio 5:1~10:
1mL/g, elution time are 3~12h.
Preferable scheme, in step 6) vulcanized sodium with sodium hydroxide mixed solution lessivation, liquid-solid ratio 2:1~5:
1mL/g, elution time are 3~12h.
Technical scheme use alkaline matter regulation oxidation processes after mercury contaminated soil particulate pH to 7 with
On, alkaline matter includes at least one of calcium oxide, calcium hydroxide, calcium carbonate, sodium hydroxide, potassium hydroxide, ammoniacal liquor.Preferably
The pH to 7~8 of mercury contaminated soil particulate is adjusted, under neutral and weak basic condition, is advantageous to the elution of follow-up thiosulfate.
The ELUTION METHOD of the present invention proposes primarily directed to the reparation of mercury contaminated soil, comprising a variety of in mercury contaminated soil
Valence state mercury, such as generally zeroth order, monovalence, the mercury of divalence can all exist simultaneously, and the mercury of these valence states can all cause soil
Mercury pollution.Numerous studies show, Hg in soil2+It is mostly soluble mercury salt, and Hg2+Easily with follow-up leacheate
The complexings such as thiosulfate ion, iodide ion form the compound of high-dissolvability and are leached out.The present invention can pass through oxygen
The modes such as change, complexing, make the mercury in mercury contaminated soil be completely converted into bivalent mercury form and are eluted into leacheate.
Technical scheme carries out oxidation processes to mercury contaminated soil in advance, nonvalent mercury in mercury contaminated soil, has
Machine mercury and monovalence mercury etc. are fully oxidized into bivalent mercury, and bivalent mercury, which is easier to be complexed into soluble compound, enters leacheate.
Technical scheme adds basic matterial or alkaline solution adjusts soil pH to neutrality after oxidation processes
Or slight alkali environment primarily serves the effect for improving thiosulfate elution efficiency, this is due to oxidizing process typically in acid bar
Carried out under part, so that soil is in sour environment, and thiosulfate is unstable under acidic condition, easily and H+Occur anti-
Should, elemental sulfur and sulfur dioxide are generated, elution efficiency is reduced so as to reduce the active ingredient of thiosulfate.
Thiosulfate solution is primarily served Hg soluble in soil after oxidation processes in technical scheme2+
And its effect that compound is eluted out, thiosulfate is to Hg2+Eluting power it is strong.
Organic acid primarily serves with salt compounded of iodine and elutes mercury existing for oxidized mercury species in soil in technical scheme
Effect out.The organic acid of use primarily serves three effects, one side H+Reacted with the mercury oxide in mercury contaminated soil, shape
Into the Hg of solubility2+, acid group complex ion is on the other hand provided, the third aspect keeps the sour environment of mercury contaminated soil, favorably
In the elution of salt compounded of iodine, mercury ion dissolution efficiency is improved.Salt compounded of iodine is mainly to provide part iodide ion, has stronger match somebody with somebody to mercury ion
Position complexing power, so as to improve solubility of the mercury compound in leacheate.
The vulcanized sodium of the present invention is primarily served with sodium hydroxide mixed solution and will washed mercury existing for vulcanization mercury shape in soil
The effect taken off.By aoxidize and for different shape mercury use different eluent multisteps elute method, to greatest extent
The mercury in soil is eluted out, reduce mercury in soils content so as to reach, repair the purpose of mercury contaminated soil.
Technical scheme uses suitable oxidizing agent solution by nonvalent mercury, organic mercury and monovalence mercury in soil first
Etc. fully oxidized into bivalent mercury, be advantageous to follow-up elution.In lessivation, the leacheate main active component used is sulphur
Thiosulfate, organic acid, salt compounded of iodine and vulcanized sodium etc..Thiosulfate provides thiosulfate ion, and thiosulfate ion can
With the Hg in soil2+Strong complexing occurs and generates stable water soluble complex (stability constant 1032.26), make
Quite a few mercury is transferred to liquid phase from solid phase of soil, so as to which its elution be handled.Organic acid provides hydrogen ion and complex acid
Radical ion, salt compounded of iodine provide I-, elution of these components to mercury play obvious synergistic function.Organic acid can be anti-with HgO
Should, free mercury ion is discharged, and organic carboxyl acid root can play a part of ligand complex mercury ion.Such as reaction equation is as follows：HgO+
2H+→Hg2++H2O.The addition of organic acid makes mercury contaminated soil be in sour environment simultaneously, is advantageous to the elution of salt compounded of iodine, salt compounded of iodine exists
Elution efficiency is higher in the case that pH is relatively low.The I provided in salt compounded of iodine-Very strong part can be formed with mercury ion, work as I-When superfluous,
Hg2+Can formed neutral HgI2 0Or negative electricity HgI3 -, HgI4 2-.Wherein the most stable with tetraiodo part, the presence of part can be with
Increase concentration of the mercury in water；It is basic only remaining in mercury contaminated soil after being eluted by thiosulfate, organic acid and salt compounded of iodine
Mercury existing in the form of mercuric sulphide, then eluted using vulcanized sodium and sodium hydroxide mixed solution, vulcanized sodium can be with mercuric sulphide
Reaction generates soluble mercuric sulphide compound Na2[HgS2], the main function of sodium hydroxide is to suppress vulcanized sodium hydrolysis, hydroxide
The addition of sodium can not be excessive, otherwise can cause Na2[HgS2] solubility declines, and slows down HgS dissolution rate.In addition, alkali
The mixed solution of property can also play following effect：(1) effect of soil pH is adjusted；(2) because the hydroxide form of mercury compares Hg-
Cl forms are more easy to be adsorbed, but pH value continue more than 5 rise when, OH-Concentration also increases so that Hg (OH) Cl activity compares Hg
(OH)2Activity is higher, therefore, Hg in soil2+Adsorbance also just decrease.So as to vulcanized sodium and sodium hydroxide mixed liquor
Further the mercury of residual absorption can be eluted by controlling pH.
There is provided in technical scheme by elute repair mercury contaminated soil method during, it is necessary to be by
First aoxidized using oxidizing agent solution, then eluted using thiosulfate solution, then eluted using organic acid and salt compounded of iodine mixed liquor,
Finally eluted using vulcanized sodium and sodium hydroxide mixed liquor, can just embody the synergy relation between elution medicament, reach
Optimal elution effect.
The method of the mercury contaminated soil reparation of the present invention, specifically includes following steps：
(1) mercury contaminated soil is crushed, milled 20 mesh sieve, removes the debris such as larger stone；
(2) suitable quantity of water is added in mercury contaminated soil after sizing moistens soil conservation, so that all kinds of reactions are more preferable
Carry out, add the oxidant configured, stir, react 20min at a temperature of being heated to 50~80 DEG C, make organic in soil
Mercury and monovalence mercury are converted into bivalent mercury；
(3) add basic matterial or alkaline solution adjusts soil pH to 7~8；
(4) thiosulfate solution is added, it is 5 to keep liquid-solid ratio:1~10:1mL/g, persistently elute 3~12h；
(5) add clear water after separation of solid and liquid, in soil to clean, reuse after ring waste and cleaning wastewater treatment；
(6) organic acid and salt compounded of iodine mixed solution are added in the soil after cleaning, it is 5 to keep liquid-solid ratio:1~10:1mL/g,
Persistently elute 3~12h；
(7) add clear water after separation of solid and liquid, in soil to clean, reuse after ring waste and cleaning wastewater treatment；
(8) vulcanized sodium and sodium hydroxide mixed solution are added in the soil after cleaning, it is 2 to keep liquid-solid ratio:1~5:1mL/
G, persistently elute 3~12h；
(9) add clear water after separation of solid and liquid, in soil to clean, reuse after ring waste and cleaning wastewater treatment, clean earth
Earth, which is dehydrated to moisture content, to be backfilled when being about 50%.
Compared with the prior art, the advantageous effects that technical scheme is brought：
1) ELUTION METHOD of the invention can realize the efficient elution of various form mercury in mercury contaminated soil；As nonvalent mercury,
Organic mercury, monovalence mercury, the mercury oxide of indissoluble and mercuric sulphide etc. can be eluted effectively；
2) the synergy ability between each rinsing step of the invention is strong, to the mercury removal ability in mercury contaminated soil
By force, effect is good；Improved by the elution positive effect under synergy to mercury such as aoxidizing, being complexed.
3) elution medicament of the invention selection organic acid, relatively existing inorganic acid are smaller to soil physico-chemical property destruction,
, can be with the difficulty such as HgO and organic acid can will not be remained in soil by the microbial degradation in soil, can also be provided hydrogen ion
The mercury reaction of molten form, generates the compound of readily soluble mercury, while provide sour environment for the elution of salt compounded of iodine；
4) technical scheme elutes extremely difficult molten sulphur using the mixed alkali liquor of vulcanized sodium and sodium hydroxide composition
Change mercury, substantially increase elution efficiency；
5) the characteristics of mercury species are included in technical scheme mercury contaminated soil is eluted using oxidation and substep
Technique, elution efficiency is substantially increased, the clearance of mercury can reach more than 90%, solve general mercury contaminated soil elution efficiency
The problem of not high.
Embodiment
Following examples are intended to further illustrate present invention, rather than the protection model of limitation the claims in the present invention
Enclose.
Embodiment 1
Guizhou mercury ore periphery polluted farmland soil is taken, wherein soil mercury content is 7.8mg/kg, and soil passes through natural wind
It is standby after milled 20 mesh sieve after dry.Oxidant and each leacheate is respectively configured, wherein oxidant is by 4% potassium peroxydisulfate
Solution is added in 5% HCl solution, volume ratio 1:10, thiosulfate solution concentration is 0.1moL/L, citric acid concentration
For 1moL/L, iodate potassium concn is 0.1moL/L, and vulcanized sodium mass percent concentration is 5%, and the addition of sodium hydroxide is sulphur
Change the 1.5% of sodium dosage.Pretreated soil 5g is weighed in 100mL centrifuge tubes, adds deionized water to moisten soil conservation,
Then the oxidant potassium persulfate solution configured is added, is controlled in the potassium peroxydisulfate and mercury contaminated soil in potassium persulfate solution
The mol ratio of mercury element is not less than 2:1,20min is heated after stirring (temperature control is at 80 degrees Celsius).Add hydroxide
Sodium solution adjusts soil pH to 7.5, then after addition hypo solution 50mL, horizontal oscillations 12h, centrifuges 20min (rotating speeds
3000r/min), abandoning supernatant, residual soil add 10mL water to vibrate 30min, the soil after washing elution, after abandoning supernatant
Citric acid is added with after KI mixed solution 50mL, continuous oscillation 12h, centrifuging 20min (rotating speed 3000r/min), discarding
Clear liquid, residual soil add 10mL water to vibrate 30min, wash the soil after elution, vulcanized sodium and hydrogen-oxygen are added after abandoning supernatant
After changing sodium mixed solution 25mL, continuous oscillation 12h, 20min (rotating speed 3000r/min), abandoning supernatant are centrifuged, residual soil adds
10mL water vibrates 30min, washs the soil after elution, soil is taken out after abandoning supernatant, and measure Mercury in Soil contains after air-drying processing
Measure as 0.68mg/kg, be less than《Standard of soil environment quality》(GB15618-1995) III Standard value (1.5mg/kg), Mercury in Soil
Clearance be 91.28%.
Comparative example 1
Soil same as Example 1 is taken, and is air-dried through identical, screening process of milling, is respectively configured and the phase of embodiment 1
With leacheate, not oxidizer carry out oxidation processes, following step is same as Example 1, air-dry processing after determine
Soil mercury content is 1.54mg/kg, slightly above《Standard of soil environment quality》(GB15618-1995) III Standard value (1.5mg/
Kg), the clearance of Mercury in Soil is 80.26%.
Comparative example 2
Soil same as Example 1 is taken, and is air-dried through identical, screening process of milling, is respectively configured and the phase of embodiment 1
Same oxidant and each leacheate.Pretreated soil 5g is weighed in 100mL centrifuge tubes, by same as Example 1
Adjusted after oxidation step processing without soil pH, ensuing rinsing step is same as Example 1, and soil is determined after air-drying processing
Earth mercury content is 1.61mg/kg, is higher than《Standard of soil environment quality》(GB15618-1995) III Standard value (1.5mg/kg),
The clearance of Mercury in Soil is 79.36%.
Comparative example 3
Soil same as Example 1 is taken, and is air-dried through identical, screening process of milling, oxidant, thio is respectively configured
Metabisulfite solution, citric acid and liquor kalii iodide, wherein oxidant are molten for the HCl that 4% potassium persulfate solution is added to 5%
In liquid, volume ratio 1:10, hypo solution concentration is 0.1moL/L, citric acid concentration 1moL/L, iodate potassium concn
For 0.1moL/L.Pretreated soil 5g is weighed in 100mL centrifuge tubes, ensuing oxidation step, regulation soil pH step
Suddenly, sodium thiosulfate rinsing step, citric acid and KI rinsing step and during water-washing step etc. with embodiment 1
It is identical, eluted without vulcanized sodium and sodium hydroxide mixed liquor, measure soil mercury content is 2.45mg/kg after air-drying processing, is higher than
《Standard of soil environment quality》(GB15618-1995) III Standard value (1.5mg/kg), the clearance of Mercury in Soil is 68.59%.
Comparative example 4
Soil same as Example 1 is taken, and is air-dried through identical, screening process of milling, oxidant, lemon is respectively configured
Acid solution, liquor kalii iodide, vulcanized sodium and sodium hydroxide mixed solution, wherein oxidant are to add 4% potassium persulfate solution
Enter into 5% HCl solution, volume ratio 1:10, citric acid concentration 1moL/L, iodate potassium concn are 0.1moL/L, vulcanization
Sodium mass percent concentration is 5%, and the addition of sodium hydroxide is the 1.5% of amount of sodium sulfide.Weigh pretreated soil
For 5g in 100mL centrifuge tubes, ensuing oxidation step is same as Example 1, without soil procedure of pH adjustment, without sulphur
Sodium thiosulfate rinsing step, remaining rinsing step and during water-washing step etc. it is same as Example 1, after air-drying processing
It is 1.65mg/kg to determine soil mercury content, slightly above《Standard of soil environment quality》(GB15618-1995) III Standard value
(1.5mg/kg), the clearance of Mercury in Soil is 78.85%.
Embodiment 2
Take soil same as Example 1, and air-dried through identical, screening process of milling, be respectively configured oxidant with it is each
4% sodium peroxydisulfate solution is is added in 5% HCl solution by leacheate, wherein oxidant, volume ratio 1:10, elution
Liquid is ATS (Ammonium thiosulphate), citric acid, sodium iodide, vulcanized sodium and sodium hydroxide mixed solution, and wherein thiosulfuric acid ammonium concentration is
0.1moL/L, citric acid concentration 1moL/L, iodate na concn are 0.1moL/L, and vulcanized sodium mass percent concentration is 5%, hydrogen
The addition of sodium oxide molybdena is the 1.5% of amount of sodium sulfide.Pretreated soil 5g is weighed in 100mL centrifuge tubes, next
The step of it is same as Example 1, it is 0.79mg/kg to air-dry and determine soil mercury content after processing, higher than the value in embodiment 1,
But it is less than《Standard of soil environment quality》(GB15618-1995) III Standard value (1.5mg/kg), the clearance of Mercury in Soil are
89.87%.
Embodiment 3
Take soil same as Example 1, and air-dried through identical, screening process of milling, be respectively configured oxidant with it is each
4% potassium persulfate solution is is added in 5% HCl solution by leacheate, wherein oxidant, volume ratio 1:10, elution
Liquid is potassium thiosulfate, tartaric acid, KI, vulcanized sodium and sodium hydroxide mixed solution, and wherein thiosulfuric acid potassium concn is
0.1moL/L, tartaric acid concentration 1moL/L, iodate potassium concn are 0.1moL/L, and vulcanized sodium mass percent concentration is 5%, hydrogen
The addition of sodium oxide molybdena is the 1.5% of amount of sodium sulfide.Pretreated soil 5g is weighed in 100mL centrifuge tubes, next
The step of it is same as Example 1, it is 0.83mg/kg to air-dry and determine soil mercury content after processing, higher than the value in embodiment 1,
But it is less than《Standard of soil environment quality》(GB15618-1995) III Standard value (1.5mg/kg), the clearance of Mercury in Soil are
89.36%.
Claims (10)
- A kind of 1. efficient restorative procedure of mercury contaminated soil, it is characterised in that：Comprise the following steps：1) mercury contaminated soil crushed, milled, sieved, take the lower mercury contaminated soil particulate of sieve；2) add water moisturizing in mercury contaminated soil particulate, add oxidizing agent solution, stir and heat carry out oxidation processes；3) pH to more than 7 of the mercury contaminated soil particulate after oxidation processes is adjusted；4) thiosulfate solution elution is added, adds water wash；5) add organic acid to elute with salt compounded of iodine mixed solution, add water wash；6) add vulcanized sodium to elute with sodium hydroxide mixed solution, add water wash.
- A kind of 2. efficient restorative procedure of mercury contaminated soil according to claim 1, it is characterised in that：The oxidizing agent solution is Persulfate solution, the mass percent concentration of persulfate solution is 0.1~1%.
- A kind of 3. efficient restorative procedure of mercury contaminated soil according to claim 2, it is characterised in that：The mol ratio of the persulfate and mercury element in mercury contaminated soil is not less than 2:1；The persulfate includes potassium peroxydisulfate and/or sodium peroxydisulfate.
- 4. according to a kind of any one of claims 1 to 3 efficient restorative procedure of mercury contaminated soil, it is characterised in that：The sulphur The concentration of thiosulfate solution is 0.01~0.3mol/L.
- A kind of 5. efficient restorative procedure of mercury contaminated soil according to claim 4, it is characterised in that：The thiosulfate includes sodium thiosulfate, potassium thiosulfate, ATS (Ammonium thiosulphate), calcium thiosulfate, magnesium thiosulfate At least one of.
- 6. according to a kind of any one of claims 1 to 3 efficient restorative procedure of mercury contaminated soil, it is characterised in that：It is described to have The concentration of machine acid and organic acid in salt compounded of iodine mixed solution is 0.5~1mol/L, and the concentration of salt compounded of iodine is 0.01~0.3mol/L；The organic acid includes at least one of citric acid, tartaric acid, oxalic acid；The salt compounded of iodine includes at least one of KI, sodium iodide, magnesium iodide, ammonium iodide.
- 7. according to any one of claims 1 to 3,5 a kind of efficient restorative procedure of mercury contaminated soil, it is characterised in that：It is described The mass percent concentration of vulcanized sodium and vulcanized sodium in sodium hydroxide mixed solution is 5~10%, and sodium hydroxide quality is vulcanization The 1~2% of sodium quality.
- 8. according to any one of claims 1 to 3,5 a kind of efficient restorative procedure of mercury contaminated soil, it is characterised in that：Step 4) in thiosulfate solution lessivation, liquid-solid ratio 5:1~10:1mL/g, elution time are 3~12h.
- 9. according to any one of claims 1 to 3,5 a kind of efficient restorative procedure of mercury contaminated soil, it is characterised in that：Step 5) in organic acid and salt compounded of iodine mixed solution lessivation, liquid-solid ratio 5:1~10:1mL/g, elution time are 3~12h.
- 10. according to any one of claims 1 to 3,5 a kind of efficient restorative procedure of mercury contaminated soil, it is characterised in that：Step 6) in vulcanized sodium and sodium hydroxide mixed solution lessivation, liquid-solid ratio 2:1~5:1mL/g, elution time are 3~12h.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110407180A (en) * | 2019-08-14 | 2019-11-05 | 山东黄金矿业科技有限公司选冶实验室分公司 | The method of high-purity calcium thiosulfate and sulfur dioxide is prepared under the conditions of wet process |
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| CN115254932A (en) * | 2022-05-16 | 2022-11-01 | 四川省分析测试服务中心(四川省科学仪器协作共用服务中心) | Soil mercury pollution remediation device and method |
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