CN106391694A - Solidification and stabilization method for mercury in mercury contaminants - Google Patents
Solidification and stabilization method for mercury in mercury contaminants Download PDFInfo
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- CN106391694A CN106391694A CN201611072066.7A CN201611072066A CN106391694A CN 106391694 A CN106391694 A CN 106391694A CN 201611072066 A CN201611072066 A CN 201611072066A CN 106391694 A CN106391694 A CN 106391694A
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- mercury
- hydrargyrum
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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
Abstract
The invention provides a solidification and stabilization method for mercury in mercury contaminants. The method includes the following steps that (1) mercury contaminant particles with the grain diameter not larger than 5 mm are mixed with soluble sulfide and water, and a first mixture is obtained; (2) the first mixture, cement and water are stirred and mixed, the stirring speed ranges from 20 r/min to 40 r/min, and a second mixture is obtained; and (3), after the second mixture is placed, the treated mercury contaminants are obtained. According to the method, the solidification effect of mercury in the contaminants is enhanced, the cement use amount is reduced on a large scale, the solidification capacity-increase ratio is small, and ready-made construction is rapid; and the leaching concentration of mercury after solidified bodies are stabilized for a long time is low, the mechanical strength of the solidified bodies can meet the requirements of ordinary road paving, and the solidification and stabilization method is suitable for mercury contamination repair projects with the large area, the tight schedule, the simple construction conditions and the low one-time invested cost requirement.
Description
Technical field
The invention belongs to danger wastes casing pipe protection and environmental protection technical field, it is related to a kind of solidification and stabilization of hydrargyrum
Method, the solidification and stabilization method of hydrargyrum in more particularly, to a kind of mercury contaminants.
Background technology
Combine announcement according to Environmental Protection Departments in 2014 and Ministry of Land and Resources《National Soil Pollution Investigation publication》
Show, the exceeded point position of national mercury in soils accounts for 1.6% exist in a large number due to the left hydrargyrum of Chemical Manufacture in distant southwest
Contaminated site, then there is the slag after a large amount of mercury ore exploitations in the ground such as Guizhou, Hunan.Additionally, hydrargyrum is as a kind of common heavy metal
Pollutant, be prevalent in China various places retired after industrial pollution place, mine selecting and purchasing and smeltery, mine tailing and slagheap
In the middle of field, contaminated river course or bottom mud in lake.Due to the physics and chemistry feature of mercury element itself, such as how relatively low cost realizes hydrargyrum
Effective improvement of contaminated soil, it is to avoid secondary pollution in governance process is that China's contaminated site repairs the technology that industry faces
One of difficult point.
Tradition includes heat treatment, drip washing, electro reclamation, phytoremediation and solidification surely for the processing method of mercury contaminated soil
Surely change technology.Wherein, heat treatment technics effect is fine, but needs design and transformation firing equipment, controls exhaust emissions, energy simultaneously
Consumption is high less economical, and the soil basic structure after heat treatment is destroyed serious；Drip washing and electric repairing technique simply achieve soil
The phase transfer of middle mercury element and valence transition, also face the problem of the middle mercury element that disposes waste liquid；Effect of plant restoration is preferable, but
It is that repairing efficiency is long, be also faced with simultaneously and process the difficult problem reclaiming plant.Than other technologies, solidification and stabilization technology has into
This is low, enforcement technology is simple, construction period is short, process the advantage of solidify afterwards body good stability, is thus advantageous to carry out mercury pollution
The QFE of soil.
In existing industrialized mercury contaminated soil solidification and stabilization technology, how solid using sulfur-bearing firming agent, cement based
Agent and cryochemistry key phosphate ceramics are as solidification and stabilization medicament.Wherein, sulfur-bearing firming agent more adopt sodium thiosulfate,
Polymer of solubility sulphurizing salt (sodium sulfide, Potassium monosulfide. etc.), sulfur and organic sulfur etc., its solidification and stabilization principle is sulfur and hydrargyrum
Reaction generates the compound insoluble in acid or alkali.Sulfur-bearing firming agent is also divided into high temperature thiamer curing technology (SPSS) and room temperature is solid
Change technology.Wherein, high temperature thiamer curing technology needs to pour under the high temperature conditions operation, and cost is very high, is generally used for core and gives up
Material is sealed up for safekeeping, is not suitable for a large amount of mercury contaminated soil solidifications.The mechanical characteristic of the firming body that solidification treatment generates is very poor, substantially
On cannot pressurized tension, landfill disposal can only be done.
As firming agent, the principle of solidification is alkaline matter and hydrargyrum generation in cement to cement-based solidified employing portland cement
The mercury oxide of indissoluble precipitates, and cement-hydrate creates physical package effect to precipitation simultaneously.Cement-based solidified construction technology letter
Single, material source is extensive, processing cost is relatively low, and the cement products after solidification are functional, water-fast, freeze proof apply it is also possible to be used as
Work construction material.But cement-based solidified there is also limitation：One is that mercury oxide has certain dissolubility, and curing efficiency is not given birth to
Become the chemical action height of cinnabar, stability is also poor, be subject to air and the erosion of water that letting out of mercury element can occur under long-term conditions
Dew；Two is that solidified cement body increase-volume ratio is very big, if for landfill, required landfill yard capacity is huge；Three is solvable in soil
The presence such as chloride, organic matter can have a negative impact to cement hydration process.
Cryochemistry key phosphate ceramics (CBPC) uses process to be similar to cement, can solidify at room temperature, solidify simultaneously
Body has the feature of pottery.The solidification of cryochemistry key phosphate ceramics is by magnesium oxide and potassium dihydrogen phosphate (adhesive) acidic group
Exothermic reaction realize.Cryochemistry key phosphate ceramics solidification effect is good, however it is necessary that being slowly stirred, reagent cost is also high
In first two technology, it is used for the cured of the mercury element of desulfurization gypsum in coal-fired power plant.
CN 102247685A discloses a kind of harmless treatment process of waste dangerous chemical containing mercury, walks including following
Suddenly：1) it is added to the water in mercury-containing wastes, and adjusts pH value and be less than 2；It is subsequently adding hydrogen peroxide, make the organic mercury in reaction system
It is completely converted into Hg with monovalence hydrargyrum2+；2) pH of reaction system is adjusted to 11-12, then heats the hydrogen peroxide removing excess；3) add
Compound sulfide, makes the Hg in reaction system2+It is fully converted to HgS precipitation；Adding ferrous salt makes excessive S2-It is heavy to be formed
Form sediment；4) to step 3) in produce precipitation and waste liquid in add curing materials carry out cured, obtain solidified cement body.But
It is that described handling process needs to waste substantial amounts of water, and processing procedure is more complicated.
Lin Sijie etc. have studied using sodium sulfide and portland cement realize mercury contaminated soil solidification and stabilization process
Method (is processed using the solidification and stabilization that sodium sulfide and portland cement realize mercury contaminated soil, Chinese scientific journal data base
Industrial A, 20 phase 219-221 in 2015), the optimum dosage 0.02% that its suggestion sodium sulfide is used alone, maximum addition is not
More than 0.16%；The optimum dosage that cement is used alone is 5%, and corresponding leachate hydrargyrum concentration is 0.005mg/L.Suggestion is optimal
Additive amount of medicament is：0.33% Na2The cement of S (i.e. mol ratio is 5)+15%, its leachate total mercury concentration is 0.002mg/
L, UCS test value is 2.0MPa.But, the leachate total concentration that the method obtains is low not enough.
Content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide in a kind of mercury contaminants the solidification of hydrargyrum stable
Change method, methods described enhances the solidification effect of mercury element in contaminated soil by generating the sulfide of hydrargyrum, and drops on a large scale
Low cement usage amount, solidification increase-volume ratio is little, ready-made quick construction, firming body steadily in the long term after hydrargyrum leaching concentration low, solidification
Mechanics intensity can reach the requirement that Ordinary Rd is mated formation.It is applied to large area, the duration is tight, execution conditions are simple and crude, disposable
Input cost requires the soil remediation project in low mercury pollution place.
In the present invention if no special instructions, described 32.5# refers to model 32.5；Described maintenance refers to place；Described can
Dissolubility sulfide is the sulfide referring to be dissolved in water；Described alkaline reagent refers to the material more than 7 for the pH value after dissolving.Described
Wt% refers to weight/mass percentage composition.
For reaching this purpose, the present invention employs the following technical solutions：
The solidification and stabilization method of hydrargyrum in a kind of mercury contaminants, methods described comprises the steps：
(1) the mercury contaminants granule that particle diameter is not more than 5mm is mixed with dissolvable sulfide and water, obtains the first mixing
Thing；
(2) the first mixture is mixed with cement and water stirring, mixing speed is 20-40r/min, obtains the second mixing
Thing；
(3) mercury contaminants after being processed after the second mixture being placed.
In the described mercury contaminants granule of step (1), the content of hydrargyrum is less than 5000mg/kg, such as the content of hydrargyrum be 5mg/kg,
10mg/kg、20mg/kg、50mg/kg、100mg/kg、200mg/kg、500mg/kg、1000mg/kg、1500mg/kg、
2500mg/kg, 3000mg/kg, 3500mg/kg, 4000mg/kg or 4500mg/kg etc..For the mercury pollution exceeding this concentration
Thing, it is possible to use method as above processes hydrargyrum, but, the pharmaceutical quantities due to adding greatly increase, and economically more do not draw
Calculate.
Preferably, the mercury contaminants granule described in step (1) is selected from mercury contaminated soil and/or mercury pollution bed mud.
Preferably, in step (1) particle diameter be not more than 5mm mercury contaminants granule pass through will mercury contaminants crush after cross 5mm
Sieve obtains.The particle diameter of the mercury contaminants granule described in step (1) can for 4.5mm, 4mm, 3.5mm, 3mm, 2.5mm, 2mm,
1.5mm, 1mm or 0.5mm etc..The granule of mercury contaminants exceedes this scope, then be not easy to mix with medicament in whipping process, fall
The reaction cross-section of low sulfur dissolving compound major pharmaceutical is it is impossible to producing good parcel and contacting effect.
For ensureing treatment effect it is preferable that should be permissible in mixed process by the mercury contaminants granule mix homogeneously after sieving
Detected using quick detection means such as hand-helds XRF tester (Xray fluorescence spectrometer).Actual treatment mercury contaminants
During, building waste and the debris in mercury contaminants should be rejected first, and with mallet or ball mill, mercury contaminants are broken
Broken, after 5mm steel sieve after crushing.
In step (1), the leachate of mercury contaminants granule should be neutral or alkaline, and such as pH is 7.5,8,9,10,11,12,13
Or 14 etc..Neutral or alkaline pH not only improves maintenance S2-Ion (can oxidized or reaction under acid condition in the presence in system
Generate hydrogen sulfide effusion reaction system), promote hydrargyrum and S2-The reaction solidification of ion, the aquation being also beneficial to follow-up cement is anti-
Should carry out.If the pH of mercury contaminants leachate is not more than 7, its leachate pH should be adjusted using alkaline reagent>11；If hydrargyrum
The pH of pollutant leachate omits this step more than 7.
Preferably, described alkaline reagent is containing OH-The material of (hydroxide ion), preferably Calx, sodium hydroxide or
In potassium hydroxide any one or at least two combination, typical but non-limiting combination such as Calx and sodium hydroxide,
Calx and potassium hydroxide, potassium hydroxide and sodium hydroxide.
The described dissolvable sulfide of step (1) is selected from sodium sulfide and/or Potassium monosulfide., is preferably sodium sulfide from cost consideration.
Preferably, the described dissolvable sulfide of step (1) and water are dissolvable sulfide solution.Described dissolvable sulfide
Can be separately added in pretreated mercury contaminants with water, also can by dissolvable sulfide and water make after solution again with mercury pollution
Thing mixes.
Preferably, in step (1), the addition of water accounts for the 20%-25% of the gross mass of dissolvable sulfide and water, such as
21%th, 22%, 23%, 24% or 24.5% etc..
The addition of the described dissolvable sulfide of step (1) based on the quality of the hydrargyrum containing in mercury contaminants, every 100mg hydrargyrum
Add the sodium sulfide of 0.03-5% mercury contaminants weight, such as add 0.04%, 0.05%, 0.08%, 0.1%, 0.2%,
0.5%th, the sodium sulfide of the mercury contaminants weight such as 0.8%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4% or 4.5%.
The described cement of step (2) is selected from 32.5# Portland cement.Cement model no particular/special requirement, cement grade is got over
Height, then its hydration is stronger, and setting time is shorter, and intensity is higher.
Preferably, the addition of the described cement of step (2) is the 10-15% of mercury contaminants weight, such as 10.5%, 11%,
12%th, 12.5%, 13%, 13.5%, 14% or 14.5% etc., the addition of cement is not then easily caused finally admittedly in this scope
Change body volume increase-volume excessive, much higher hard, water penetration reduces, and is unfavorable for recycling.
Described dissolvable sulfide can be by heavy metal Hg element in mercury contaminants to be insoluble in the cinnabar of soda acid
Form is fixed in cement colloid structure, and relies on the isolation contact with air for the cinnabar of cement colloid micro structure.It is substantially anti-
Answer mechanism to be that sulphion reacts generation HgS with Hg (II), be in acid with all sufficiently stable under alkalescence condition precipitation, can be effective
Reduce the Transport And Transformation ability of hydrargyrum, its reactional equation is as follows：
Hg2++S2-→HgS↓
Cement hydration process mainly wherein tricalcium silicate 3CaO SiO2(C3) and dicalcium silicate 2CaO SiO S2(C2S)
React the process generating gelatinous aqueous calcium silicates (C-S-H) with water, its reactional equation is as follows：
C3S+H2O→Ca2++OH-+H4SiO4→C-S-H+Ca(OH)2
C2S+H2O→Ca2++OH-+H4SiO4→C-S-H+Ca(OH)2
Hg2++OH-→Hg(OH)2→HgO+H2O
Almost all of Ca on the C-S-H that cement is formed in hydration process2+Can be by Hg2+Replace；Gel shape simultaneously
The C-S-H of state has high specific surface area, can adsorb mercury ion or so that mercury ion is occurred altogether on its surface with other materials
Sedimentation phenomenon.Additionally, the network having after hydrated cementitious can be wrapped up and fixing mercury element, but this consolidated structures are subject to ring
Border impact is larger, and long-term preservation is more unstable.
The speed of the described stirring of step (2) is 20-40r/min, such as 22r/min, 25r/min, 28r/min, 30r/min,
32r/min, 35r/min or 38r/min etc., mixing time is 5min.It should be noted that the stirring of whipping process in described processing procedure
Speed, it is ensured that soil fully infiltrates and is sufficiently mixed with cement, may have hydrogen sulfide gas to overflow in whipping process, therefore, should
Execute operation in spacious and draughty place.Mixing speed is excessive, increases the spilling of hydrogen sulfide gas, easily causes
Secondary pollution；Mixing speed is too small, and shearing force is not it is impossible to be sufficiently mixed uniform doses and pending soil.
In the described whipping process of step (2), the quality of control water is the 20-25% of the gross mass of the first mixture and cement,
As 21%, 22%, 23%, 24% or 24.5% etc..
Before the described placement of step (3), the second mixture is put in solidification mould, and stocky.
Preferably, firming body die surface setting covering.Described covering is selected from paulin or Polypropylence Sheet etc..In order to protect
Demonstrate,prove smooth form removal, can put in solidification mould in the second mixture and slightly unclamp solidification mould after 24-48h, such as 26h,
28h, 30h, 32h, 35h, 38h, 40h or 45h etc..
Preferably, keep the relative humidity of the second mixture more than 95%, such as in the described placement process of step (3)
96%th, 97%, 98% or 99% etc..Certain humidity phase should be kept periodically to die surface spray water in placement process
Humidity should be controlled more than 95% it is ensured that the moist cracking in firming body surface, internal hydration is persistently carried out.As humidity mistake
Low, it is easily caused firming body cracking, oxygen penetrates into firming body, destroys the inclusion enclave of sulfide-hydrargyrum, causes treatment effect not good.
Preferably, the time of the described placement of step (3) is no less than 7 days, such as 7.5 days, 8 days, 9 days, 10 days, 11 days, 12
It or 15 days etc..
As preferred technical scheme, the solidification and stabilization method of described hydrargyrum comprises the steps：
(1) 5mm sieve, the mercury contaminants granule mix homogeneously after sieving are crossed after mercury contaminants being crushed；
(2) pH of leaching solution of the mercury contaminants granule of detection mix homogeneously, it is ensured that its pH value is not less than 7, obtains pre- place
Mercury contaminants after reason；
(3) pretreated mercury contaminants are mixed with dissolvable sulfide and water, obtain the first mixture, wherein solvable
Property sulfide addition according to hydrargyrum in mercury contaminants quality meter, every 100mg hydrargyrum adds 0.03-5% mercury contaminants weight
Dissolvable sulfide, the addition of water accounts for the 20%-25% of the gross mass of dissolvable sulfide and water；
(4) the first mixture is mixed with 32.5# Portland cement and water stirring, mixing speed is 20-40r/
Min, mixing time is 5min, obtains the second mixture, the addition of 32.5# Portland cement is mercury contaminants weight
10-15%, in whipping process, the quality of control water is the 20- of the gross mass of the first mixture and 32.5# Portland cement
25%；
(5) by the second mixture relative humidity be more than 95% environment under place be no less than 7 days, after being processed
Mercury contaminants.
Compared with prior art, beneficial effects of the present invention are：
1st, with traditional be used alone the solidification and stabilization technology of cement compared with, under equivalent effect, the hydrargyrum that the present invention provides
In contaminated soil, the solidification and stabilization method of hydrargyrum reduces more than cement consumption 80wt%, significantly reduces firming body due to cement
Oxidation and the aging risk repeating to discharge leading to hydrargyrum, in addition reduce firming body increase-volume ratio, reduce steadily in the long term after hydrargyrum
Leaching concentration is low, and has the advantages that site operation is faster it is adaptable to large area, the duration is tight, execution conditions are simple and crude, once
Property input cost require the soil remediation project in low mercury pollution place；
2nd, with traditional be used alone the solidification and stabilization technology of sulfide compared with, in the mercury contaminated soil that the present invention provides
The firming body that the solidification and stabilization method of hydrargyrum produces is much better than consolidating of sulfide solidification and stabilization technology generation in structural strength
Change body, different with the ratio of sodium sulfide according to cement interpolation content, its early anti pressured intension is not less than 2.1MPa, meet building work
The requirement of industry cement brick, can be applied to pavement as environment-friendly materials, the little occasion of the compressive strengths such as stone is stepped in flower nursery；
3 compared with the method for other heat cure stabilization methods and cryochemistry key phosphate ceramics, and the present invention provides
Mercury contaminated soil in the solidification and stabilization method of hydrargyrum do not need to heat, medicament raw material is simple and easy to get, and repair time is short, operation
Process is easy；
4th, the firming body good stability that in the mercury contaminated soil that the present invention provides, the solidification and stabilization method of hydrargyrum obtains, it 7
Day, after 30 days according to《Solid waste Leaching leaching method sulfonitric method》(HJ/T-2992007)、《Solid waste leaches
Toxicity leaching method hac buffer method》The leaching concentration test result of (HJ/T 300 2007) is：Equipment shows not to be examined
Go out, in the leachate of test firming body, the concentration of hydrargyrum is respectively less than 0.001mg/L.
Specific embodiment
To further illustrate technical scheme below by specific embodiment.
Embodiment 1
The solidification and stabilization method of hydrargyrum in a kind of mercury contaminated soil：
Described mercury contaminated soil is derived from the scene after the removal of certain acetylene production polyethylene workshop.Former workshop utilizes carrying active
The mercuric chloride of charcoal as catalyst, occurred to reveal and row's event steathily in process of production.
Methods described comprises the steps：
(1) using above-mentioned mercury contaminated soil as original soil, take original soil 2kg, break after removing building waste, stone and plant roots and stems
Broken, and cross 5mm stainless steel sift；It is 600mg/kg that the soil sieving records hydrargyrum average content by evenly mixing afterwards；
(2) the pure sodium sulfide of analysis taking 360g is added in original soil and is sufficiently mixed, and adds 236mL from the beginning after mixing
Water, stirs 5 minutes it is ensured that being sufficiently mixed and reacting with 20 revs/min of speed, obtains the first mixture；
(3) add the 32.5# Portland cement of 300g in the first mixture, then add the tap water of 264g, with
20 revs/min of mixing speed is sufficiently stirred for, and makes test block after stirring；
(4) by test block, in the environment of relative humidity is for 95%, maintenance crushed after 7 days, obtained firming body.
In the leachate of test firming body, the concentration of hydrargyrum is less than 0.001mg/L.
Embodiment 2
The solidification and stabilization method of hydrargyrum in a kind of mercury contaminated soil, methods described comprises the steps：
(1) using mercury contaminated soil as original soil, take original soil 5kg, crush after removing building waste, stone and plant roots and stems,
And cross 4mm stainless steel sift；Recording hydrargyrum average content after the native mix homogeneously sieving is 1000mg/kg；
(2) the pure sodium sulfide of analysis taking 15g is added in original soil and is sufficiently mixed, and adds the tap water of 236mL after mixing,
Stir 5 minutes it is ensured that being sufficiently mixed and reacting with 20 revs/min of speed, obtain the first mixture；
(3) add the 32.5# Portland cement of 500g in the first mixture, then add appropriate tap water, from
The addition of water is the 25% of the first mixture and 32.5# Portland cement gross mass, with 20 revs/min of stirring speed
Degree is sufficiently stirred for, and makes test block after stirring；
(4) by test block, in the environment of relative humidity is for 96%, maintenance crushed after 10 days, obtained firming body.
In the leachate of test firming body, the concentration of hydrargyrum is less than 0.001mg/L.
Embodiment 3
The solidification and stabilization method of hydrargyrum in a kind of mercury contaminated soil, methods described comprises the steps：
(1) using mercury contaminated soil as original soil, take original soil 5kg, crush after removing building waste, stone and plant roots and stems,
And cross 3mm stainless steel sift；It is 5000mg/kg that the soil sieving records hydrargyrum average content by evenly mixing afterwards；
(2) the pure sodium sulfide of analysis taking 62.5kg is added in original soil and is sufficiently mixed, and adds 236mL from the beginning after mixing
Water, stirs 5 minutes it is ensured that being sufficiently mixed and reacting with 20 revs/min of speed, obtains mixture；
(3) add the 32.5# Portland cement of 750g in the first mixture, then add appropriate tap water, from
The addition of water is the 25% of the first mixture and 32.5# Portland cement gross weight, with 20 revs/min of stirring speed
Degree is sufficiently stirred for, and makes test block after stirring；
(4) by test block, in the environment of relative humidity is for 98%, maintenance crushed after 15 days, obtained firming body.
In the leachate of test firming body, the concentration of hydrargyrum is less than 0.001mg/L.
Embodiment 4
The solidification and stabilization method of hydrargyrum in a kind of mercury contaminated soil, methods described comprises the steps：
(1) using mercury contaminated soil as original soil, take original soil 2kg, crush after removing building waste, stone and plant roots and stems,
And cross 1mm stainless steel sift；It is 2000mg/kg that the soil sieving records hydrargyrum average content by evenly mixing afterwards；
(2) the pure sodium sulfide of analysis taking 400g is added in original soil and is sufficiently mixed, and adds 236mL from the beginning after mixing
Water, stirs 5 minutes it is ensured that being sufficiently mixed and reacting with 20 revs/min of speed, obtains mixture；
(3) add the 32.5# Portland cement of 240g in the first mixture, then add appropriate tap water, from
The addition of water is the 25% of the first mixture and 32.5# Portland cement gross weight, with 20 revs/min of stirring speed
Degree is sufficiently stirred for, and makes test block after stirring；
(4) by test block, in the environment of relative humidity is for 97%, maintenance crushed after 10 days, obtained firming body.
In the leachate of test firming body, the concentration of hydrargyrum is less than 0.001mg/L.
Embodiment 5
The solidification and stabilization method of hydrargyrum in a kind of mercury contaminated soil, methods described comprises the steps：
(1) using mercury contaminated soil as original soil, take original soil 2kg, crush after removing building waste, stone and plant roots and stems,
And cross 2mm stainless steel sift；It is 500mg/kg that the soil sieving records hydrargyrum average content by evenly mixing afterwards；
(2) the pure sodium sulfide of analysis taking 3g is added in original soil and is sufficiently mixed, and adds the tap water of 50mL after mixing, with
40 revs/min of speed stirs 5 minutes it is ensured that being sufficiently mixed and reacting, and obtains the first mixture；
(3) add the 32.5# Portland cement of 200g in the first mixture, then add appropriate tap water, from
The addition of water is the 20% of the first mixture and 32.5# Portland cement gross weight, with 40 revs/min of stirring speed
Degree is sufficiently stirred for, and makes test block after stirring；
(4) by test block, in the environment of relative humidity is for 97%, maintenance crushed after 10 days, obtained firming body.
In the leachate of test firming body, the concentration of hydrargyrum is less than 0.001mg/L.
Embodiment 6
The solidification and stabilization method of hydrargyrum in a kind of mercury contaminated soil, methods described comprises the steps：
(1) using mercury contaminated soil as original soil, take original soil 2kg, crush after removing building waste, stone and plant roots and stems,
And cross 0.5mm stainless steel sift；It is 200mg/kg that the soil sieving records hydrargyrum average content by evenly mixing afterwards；
(2) the pure sodium sulfide of analysis taking 200g is added in original soil and is sufficiently mixed, and adds the tap water of 25mL after mixing,
Stir 5 minutes it is ensured that being sufficiently mixed and reacting with 30 revs/min of speed, obtain mixture；
(3) add the 32.5# Portland cement of 300g in the first mixture, then add appropriate tap water, from
The addition of water is the 22% of the first mixture and 32.5# Portland cement gross weight, with 30 revs/min of stirring speed
Degree is sufficiently stirred for, and makes test block after stirring；
(4) by test block, in the environment of relative humidity is for 98%, maintenance crushed after 8 days, obtained firming body.
In the leachate of test firming body, the concentration of hydrargyrum is less than 0.001mg/L.
Comparative example 1
The solidification and stabilization method of hydrargyrum in a kind of mercury contaminated soil, methods described removes mercury contaminants granule in step (1)
Particle diameter is that outside 8mm, remaining is same as Example 1.
In the leachate of test firming body, the concentration of hydrargyrum is 4.5mg/L.
Comparative example 2
The solidification and stabilization method of hydrargyrum in a kind of mercury contaminated soil, methods described is removed common for 32.5# silicic acid in step (3)
The addition of salt cement is that outside 450g, remaining is same as Example 1.
In the leachate of test firming body, the concentration of hydrargyrum is 4.1mg/L.
Comparative example 3
The solidification and stabilization method of hydrargyrum in a kind of mercury contaminated soil, it is 45r/ that methods described removes mixing speed in step (4)
Outside min, remaining is same as Example 1.
In the leachate of test firming body, the concentration of hydrargyrum is 3.2mg/L.
Comparative example 4
The solidification and stabilization method of hydrargyrum in a kind of mercury contaminated soil, it is 18r/ that methods described removes mixing speed in step (4)
Outside min, remaining is same as Example 1.
In the leachate of test firming body, the concentration of hydrargyrum is 4.3mg/L.
Applicant states, the present invention illustrates the method detailed of the present invention by above-described embodiment, but the present invention not office
It is limited to above-mentioned method detailed, that is, do not mean that the present invention has to rely on above-mentioned method detailed and could implement.Art
Technical staff is it will be clearly understood that any improvement in the present invention, the equivalence replacement to each raw material of product of the present invention and auxiliary element
Interpolation, selection of concrete mode etc., within the scope of all falling within protection scope of the present invention and disclosure.
Claims (10)
1. in a kind of mercury contaminants the solidification and stabilization method of hydrargyrum it is characterised in that methods described comprises the steps：
(1) the mercury contaminants granule that particle diameter is not more than 5mm is mixed with dissolvable sulfide and water, obtains the first mixture；
(2) the first mixture is mixed with cement and water stirring, mixing speed is 20-40r/min, obtains the second mixture；
(3) mercury contaminants after being processed after the second mixture being placed.
2. the solidification and stabilization method of hydrargyrum according to claim 1 is it is characterised in that the described mercury contaminants of step (1)
In grain, the content of hydrargyrum is less than 5000mg/kg；
Preferably, the mercury contaminants granule described in step (1) is selected from mercury contaminated soil and/or mercury pollution bed mud；
Preferably, in step (1) particle diameter be not more than 5mm mercury pollution particulate matter pass through will mercury contaminants crush after mistake 5mm sieve
Arrive；
Preferably, the mercury contaminants granule mix homogeneously obtaining after sieving.
3. the solidification and stabilization method of hydrargyrum according to claim 1 and 2 is it is characterised in that the described mercury contaminants of step (1)
When the pH of granule leachate is not more than 7, its leachate pH is adjusted using alkaline reagent>11；The described mercury contaminants of step (1) leach
When the pH of liquid is more than 7, without regulation pH；
Preferably, described alkaline reagent be selected from Calx, in sodium hydroxide or potassium hydroxide any one or at least two
Combination.
4. the solidification and stabilization method of the hydrargyrum according to one of claim 1-3 is it is characterised in that step (1) is described solvable
Property sulfide be selected from sodium sulfide and/or Potassium monosulfide., preferably sodium sulfide；
Preferably, the described dissolvable sulfide of step (1) and water are dissolvable sulfide solution；
Preferably, in step (1), the addition of water accounts for the 20%-25% of the gross mass of dissolvable sulfide and water.
5. the solidification and stabilization method of the hydrargyrum according to one of claim 1-4 is it is characterised in that step (1) is described solvable
Property sulfide addition based on the quality of the hydrargyrum containing in mercury contaminants, every 100mg hydrargyrum adds 0.03-5% mercury contaminants weight
The sodium sulfide of amount.
6. the method for the solidification and stabilization method of the hydrargyrum according to one of claim 1-5 is it is characterised in that step (2) institute
State cement and be selected from 32.5# Portland cement；
Preferably, the addition of the described cement of step (2) is the 10-15% of mercury contaminants weight.
7. the solidification and stabilization method of the hydrargyrum according to one of claim 1-6 is it is characterised in that the described stirring of step (2)
Time be 5min.
8. the solidification and stabilization method of the hydrargyrum according to one of claim 1-7 is it is characterised in that the described stirring of step (2)
During control water quality be the first mixture and cement gross mass 20%-25%.
9. the solidification and stabilization method of the hydrargyrum according to one of claim 1-8 is it is characterised in that the described placement of step (3)
Second mixture is put in solidification mould before, and stocky；
Preferably, firming body die surface setting covering；
Preferably, keep the relative humidity of the second mixture more than 95% in the described placement process of step (3)；
Preferably, the time of the described placement of step (3) is no less than 7 days.
10. the hydrargyrum according to one of claim 1-9 solidification and stabilization method it is characterised in that methods described include as
Lower step：
(1) 5mm sieve, the mercury contaminants granule mix homogeneously after sieving are crossed after mercury contaminants being crushed；
(2) pH of leaching solution of the mercury contaminants granule of detection mix homogeneously is it is ensured that its pH value is not less than 7, after obtaining pretreatment
Mercury contaminants；
(3) pretreated mercury contaminants are mixed with dissolvable sulfide and water, obtain the first mixture, wherein solubility sulfur
The addition of compound adds the solvable of 0.03-5% mercury contaminants weight according to the quality meter of hydrargyrum in mercury contaminants, every 100mg hydrargyrum
Property sulfide, the addition of water accounts for the 20%-25% of the gross mass of dissolvable sulfide and water；
(4) the first mixture is mixed with 32.5# Portland cement and water stirring, speed of agitator is 20-40r/min, stirs
Time of mixing is 5min, obtains the second mixture, and the addition of 32.5# Portland cement is the 10- of mercury contaminants weight
15%, in whipping process, the quality of control water is the 20%- of the gross mass of the first mixture and 32.5# Portland cement
25%；
(5) by the second mixture relative humidity be more than 95% environment under place and be no less than 7 days, the dirt of hydrargyrum after being processed
Dye thing.
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| CN107115972A (en) * | 2017-05-05 | 2017-09-01 | 任开有 | The method that golden copper and solidification processing are reclaimed in flotation tailing |
| CN108069670A (en) * | 2017-12-14 | 2018-05-25 | 湖南恒凯环保科技投资有限公司 | A kind of stable curing method of mercurous waste material |
| CN108687114A (en) * | 2018-05-16 | 2018-10-23 | 扬州杰嘉工业固废处置有限公司 | A kind of Organomercurial waste is stable and cures disposing technique |
| CN112047667A (en) * | 2020-09-15 | 2020-12-08 | 常熟理工学院 | Preparation method and application of mercury-contaminated soil molybdenum disulfide geopolymer composite material |
| CN112125586A (en) * | 2020-09-23 | 2020-12-25 | 常熟理工学院 | Preparation method and application of sulfhydryl modified graphene oxide nanosheet/geopolymer composite material |
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| CN112125586A (en) * | 2020-09-23 | 2020-12-25 | 常熟理工学院 | Preparation method and application of sulfhydryl modified graphene oxide nanosheet/geopolymer composite material |
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