CN109082276A - A kind of place arsenic cadmium composite passivant, preparation method and applications - Google Patents
A kind of place arsenic cadmium composite passivant, preparation method and applications Download PDFInfo
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Abstract
The present invention provides a kind of place arsenic cadmium composite passivant, preparation method and applications to be stirred to react the preparation method comprises the following steps: 1) adobe is added in ferrous sulfate aqueous solution；2) it is obtained in system to step 1) and quick lime is added, be stirred to react；3) under stirring condition, rich iron oxide red soil and pyrolusite powder is added into the mixture that step 2) obtains, is stirred；4) after the wet feed drying obtained step 3), calcining is cooling to get place arsenic cadmium composite passivant.Compared with prior art, the place arsenic cadmium composite passivant that the present invention is prepared by the above method, has that preparation is easy, low in cost, has excellent performance, the features such as applicability is wide.
Description
Technical field
The invention belongs to site remediation technology fields, and in particular to a kind of place arsenic cadmium composite passivant, preparation method and
It is applied.
Background technique
Heavy metal passivating technique is to administer place heavy metal pollution most efficiently and effectively one of measure, by heavy metal-polluted
It contaminates and adds one or more of substances in soil, make the Active Heavy Metals in soil that absorption, precipitating, complexing, ion exchange, oxygen occur
Change the chemical reaction of a series of physical such as reduction, change its occurrence patterns in the soil, reduce its migration in the soil and
Biological effectiveness.
The characteristics of combined pollution is presented in the heavy metal pollution of China place, and exploitation is directed to the efficient passivation of Compound Heavy Metals
Agent is very necessary.The current place passivator for single heavy metal pollution is relatively conventional, but for Compound Heavy Metals
Place passivator is then rarely reported.How arsenic, chromium and the other cationic heavy metal different to passivation mechanisms synchronizes efficiently
It administers, is one of the focus on research direction of soil Compound Heavy Metals reparation.
In contaminated sites, arsenic cadmium combined pollution is relatively conventional.On April 27th, 2016, Ecological Environment in Guangdong and soil
Research institute discloses a kind of iron-based charcoal soil heavy metal passivant of slow-release (105524623 A of CN), with special ratios
Iron-based charcoal, kaolin and biological starch are core material, using the chitosan silica solution composite material being prepared separately as coating, to core
Material is coated, and is controlled certain mass volume ratio and is obtained.Charcoal is light to be easily caused and sows fugitive dust and sow unevenness, the invention
It solves the problems, such as this by enrobing processes, while also avoiding charcoal and directly being acted on and too fast saturation with soil, improve iron
Base charcoal passivation efficiency, in a disguised form saves charcoal dosage.The passivator is applied in farmland, 4 growths of sustainable effect
Season crop yield also can be improved.However site remediation passivator dosage is much higher than farmland, chooses upper cost problem in passivator
It can not be ignored.Passivator preparation process is cumbersome, and raw material is high with preparation cost, and the coating of iron-based charcoal may cause chalybeate
Slow effect are directly acted on, applicability is not strong in site remediation field.
On May 31st, 2017, Zhejiang University disclose a kind of preparation method (CN of magnetic bio charcoal adsorbent material
106732350 A), include the following steps: 1) by ferrous iron, ferric iron mixed preparing aqueous solution and to adjust according to specific molar ratio
PH is to alkalinity；2) according to specific solid-to-liquid ratio, 2h is mixed in aqueous solution and the heating of plant straw biological matter, sealing and standing is for 24 hours；
3) by after the solid drying in above-mentioned gains, appropriate calcium carbonate powder is added, pyrolysis 2h obtains the material in protective gas atmosphere
Material.The invention completes magnetic attachment while prepared by adsorbent material, and the iron oxide of attachment can effectively remove in aqueous solution
Arsenic, the calcium carbonate of addition maintains material to the removal ability of cadmium, realizes arsenic cadmium combined pollution reparation.The innovation point
It is that magnetic material is easy to recycle from system, is primarily adapted for use in water body treating, the innovative point is had no way of for site remediation
It plays.The material preparation link is related to pH adjusting, discharge of wastewater, inert atmosphere protection, and technique is relative complex.Passivator uses
When also easily there is sowing fugitive dust, sow uneven problem.
On September 1st, 2017, Inst. of Soil Fertilizer, Anhui Prov. Agriculture Science Academy disclose a kind of based composite material of carbon and answer
With (107115840 A of CN), agricultural crop straw charing is prepared into charcoal, then is mixed with certain solid-to-liquid ratio with iron salt solutions, is adjusted
Section pH value of solution is co-precipitated the two, and pyrolysis forms based composite material of carbon.The material can be applied on arsenic cadmium combined pollution soil, right
It can also be effectively removed in arsenic in water body cadmium ion, but preparation process is related to straw charring, pH adjusting, discharge of wastewater and dries repeatedly
It is dry, there are complex procedures, the problems such as energy consumption is higher, drug out loss.
The above invention mostly uses charcoal as passivator substrate for the reparation of arsenic cadmium combined pollution.Biological carbon surface is rich in
Carboxyl, hydroxyl and negative electrical charge, and large specific surface area can be improved acid soil pH, increase Cation Exchange Capacity in Soils, adsorptional earth
Active Heavy Metals in earth.However, charcoal preparation be related to high temperature protection atmosphere calcining process, prepare it is more demanding, energy consumption compared with
Height there is a problem of with high costs for the biggish site remediation project of passivator dosage.Single creature charcoal is to anionic form
Arsenic adsorption capacity it is relatively limited, for place arsenic cadmium combined pollution, also need to carry out charcoal substrate compounding or modification,
Further increase material preparation cost.Charcoal is light, and fugitive dust is big when use, easily floats on surface, influence vulnerable to wind direction and
It is deposited in lower air port, causes application uneven.
Summary of the invention
To solve the deficiencies in the prior art, it the purpose of the present invention is to provide a kind of place arsenic cadmium composite passivant, is based on
Natural porous clay material is aided with chemical modification, medium temperature roast processing strengthens it and is passivated efficiency, then is included in additional passivation and helps
Agent, for relatively conventional arsenic cadmium combined pollution place, provide it is a kind of can simultaneously in efficient passivation soil arsenic and cadmium it is compound
Passivator has many advantages, such as that low in cost, preparation is easy, has excellent performance, strong applicability.
Another object of the present invention is to provide a kind of preparation methods of place arsenic cadmium composite passivant.
It is also an object of the present invention to provide a kind of applications of place arsenic cadmium composite passivant.
Specific technical solution of the present invention is as follows:
A kind of preparation method of place arsenic cadmium composite passivant provided by the invention, comprising the following steps:
1) adobe is added in ferrous sulfate aqueous solution, is stirred to react；
2) it is obtained in system to step 1) and quick lime is added, be stirred to react；
3) under stirring condition, rich iron oxide red soil and pyrolusite powder is added into the mixture that step 2) obtains, is stirred；
4) after the wet feed drying obtained step 3), calcining is cooling to get place arsenic cadmium composite passivant.
The amount ratio of adobe and ferrous sulfate aqueous solution is 1:1~3:2kg/L in step 1).The adobe grain
Degree is 100~200 mesh, the adobe be selected from one of natural attapulgite, bentonite, sepiolite or diatomite or
It is a variety of.The ferrous sulfate aqueous solution mass concentration is 60~120g/L.
It is stirred to react described in step 1) and refers to that 100~200rpm is thoroughly mixed 10~40min.
It is stirred to react described in step 2) and refers to 0.5~1h of reaction under 100~200rpm stirring condition；
Under stirring condition described in step 3), refer under 100~200rpm stirring condition.
It is stirred described in step 3), refers to and be sufficiently mixed 0.5~1h under 100~200rpm stirring condition.
The soil of richness iron oxide red described in step 3), Fe2O3Content is 5.0~5.5 not less than 5%, pH, and granularity is 100~200 mesh.
The richness iron oxide red soil content of beary metal is not higher than " soil environment quality construction land soil pollution risk management and control standard " (GB
36600-2018) first kind land used screening value.
Pyrolusite powder described in step 3), MnO2Content is not less than 60%, and granularity is 100~200 mesh.The pyrolusite powder
Content of beary metal is not higher than " soil environment quality construction land soil pollution risk management and control standard " (GB 36600-2018) first
Class land used screening value.
Above-mentioned adobe, quick lime, rich iron oxide red soil and pyrolusite powder quality be 35~45:25~40:20~30:5
~15.
Step 4) specifically: first 2~3h of drying heat preservation at a temperature of 110 ± 10 DEG C, then, 0.5h is warming up to 350~550
DEG C, 2~4h is roasted at this temperature, finally, being cooled to room temperature to get place arsenic cadmium composite passivant.
A kind of place arsenic cadmium composite passivant of this offer, is prepared using the above method.
A kind of application of place arsenic cadmium composite passivant of this offer is used for arsenic cadmium combined pollution site remediation.
Concrete application method are as follows:
Place arsenic cadmium composite passivant dosage is the 3%~5% of butt soil quality, when use to soil keep the skin wet to
It is saturated aqueous, passivator and soil are mixed well, 5~7d is conserved.
After passivator application, referring to " solid waste Leaching leaching method horizontal vibration method " (HJ 557-2010), weight
Metallic arsenic, cadmium leaching concentration are lower than " groundwater quality standard " (GB/T 14848-2017) III class limit value, can carry out security landfill
Or resource utilization.
The present invention impregnates 35~45 parts of adobes with ferrous sulfate solution, adds 25~40 parts of quick lime stirring lifes
Heat.Promote transformation of the iron ion to activity hydroxy iron under alkali deposition and heat effect, point of the iron carbonyl in clay interlayer under heat effect
It dissipates more uniform.After stirring 0.5~1h, then that 20~30 parts of rich iron oxide reds soil, 5~15 parts of pyrolusite powders are added into mixture is abundant
0.5~1h is mixed, 110 ± 10 DEG C of 2~3h of drying, 350~550 DEG C of 2~4h of roasting again in saggar feeding fuel gas table kiln are fitted into,
Place arsenic cadmium composite passivant finished product is made after cooling.In the ingenious Morphological Transitions for promoting iron species using quick lime of preparation link
And its dispersion in clay hole, excess of solvent water produced during the preparation process pass through the chemical reaction of quick lime, subsequent rich iron
The absorption of laterite and pyrolusite powder, basic nothing left water, without additional disposition.The main side of passivator of the present invention is adobe, is had
Higher specific surface area and nano pore abundant, selection and preparation are prominent compared to biological carbon materials cost advantage, are passivated to cadmium
Effect is obvious.While the passivator clay+lime collaboration passivation cadmium, clay interlayer activity hydroxy iron, rich iron oxide red soil continue
The active iron and pyrolusite powder of sustained release can cooperative achievement arsenic passivation.
The place arsenic cadmium composite passivant that the present invention is prepared by the above method, have preparation it is easy, low in cost,
It has excellent performance, the features such as applicability is wide.Beneficial effects of the present invention are as follows:
1) it is raw material that the passivator, which selects natural porous clay, quick lime, rich iron oxide red soil, pyrolusite powder etc., and supplied materials is wide
It is general, it is low in cost.
2) passivator has the effect of arsenic, the passivation of cadmium synchronous high-efficiency.Wherein main side's adobe, is soaked by molysite
Stain, lime sedimentation are handled with medium temperature roast, so that clay is obtained higher specific surface area and are passivated efficiency with heavy metal.Wherein clay is negative
Ferrous components in the activity hydroxy iron of load, rich iron oxide red soil are the main component that arsenic pollution is administered, and promote arsenic by low in pyrolusite powder
Valence to high price transformation synergistic effect under can and arsenate formed specificity combination.At the same time, adobe through lime at
It is then the material that excellent cadmium pollution is administered after reason, high-temperature roasting.
3) it is discharged in passivator preparation method simple possible, especially preparation process without waste water, exhaust gas, this method utilizes life
The chemical reaction heat of lime and water promotes the migration of iron species and phase transition, energy consumption small, high-efficient.
Specific embodiment
Below according to Examples 1 to 3 and comparative example 1~3, the present invention is described in detail.
Embodiment 1
A kind of place arsenic cadmium composite passivant is prepared using following technique:
1) it weighs 100 mesh calcium-base bentonite 35kg to be put into stir mixing machine, the 100g/L ferrous sulfate that 35L is added is molten
Liquid, opens stirring, and 150rpm is thoroughly mixed 30min；
2) it is added into the suspension that step 1) obtains under 200 mesh quick lime 35kg, 150rpm stirring conditions and reacts 30min；
3) under 150rpm stirring condition, 100 mesh richness iron oxide red soil 25kg and 100 mesh are added into the mixture that step 2) obtains
Pyrolusite powder 5kg, mixes well 40min；
4) stop stir mixing machine, the wet feed that step 3) is obtained is packed into kiln saggar, roasts in fuel gas table kiln, dries
Dry section temperature is 110 ± 10 DEG C, drying heat preservation 3h, and drying section is warming up to furnace zone 0.5h, and 400 DEG C of furnace zone temperature control is permanent
Place arsenic cadmium composite passivant is finally made in warm 2h, kiln discharge after cooling.
The application of above-mentioned place arsenic cadmium composite passivant:
Take preparatory certain the Compound Heavy Metals place soil for crossing 2mm sieve of 100g (butt), soil pH 8.5.According to " Gu
Body waste Leaching leaching method horizontal vibration method " (HJ 557-2010), measuring arsenic in soil leaching concentration is 0.067mg/L,
Cadmium leaching concentration is 0.018mg/L, exceeds " groundwater quality standard " (GB/T 14848-2017) V class limit value.It will be for examination
Soil is placed in extraction flask, and the place arsenic cadmium composite passivant of the above-mentioned preparation of soil quality 4% is added, mixes well.Foundation
HJ 557-2010 is calculated the volume of required digestion agent by liquid-solid ratio 10:1 (L/kg), and secondary analysis use for laboratory water is added
(GB/T 6682) is vertically fixed on horizontal shaking device after covering tightly bottle cap.Adjusting frequency of oscillation is 120rpm, and amplitude is
40mm removes extraction flask after vibrating 8h at room temperature, stands 16h.0.45 μm of miillpore filter is installed in Suction filtration device, filtering is simultaneously
Leachate is collected, test arsenic, cadmium leaching concentration are respectively 0.003mg/L and 0.002mg/L, are below " groundwater quality standard "
(GB/T 14848-2017) III class limit value.Three parts of parallel samples operated on an equal basis early period are separately prepared, are stood after removing extraction flask
7d filters test leachate arsenic, cadmium concentration is respectively 0.003mg/L, 0.002mg/L；Standing 15d, suction filtration test leachate arsenic,
Cadmium concentration is respectively 0.003mg/L, 0.003mg/L；45d is stood, filters test leachate arsenic, cadmium concentration is respectively 0.002mg/
L、0.002mg/L。
Embodiment 2
A kind of place arsenic cadmium composite passivant is prepared using following technique:
1) 200 mesh attapulgite 30kg are weighed, 200 mesh sepiolite 15kg are put into stir mixing machine, the 80g/ of 45L is added
L ferrous sulfate solution, opens stirring, and 200rpm is thoroughly mixed 20min；
2) it is added into the suspension that step 1) obtains under 100 mesh quick lime 30kg, 200rpm stirring conditions and reacts 35min；
3) under 200rpm stirring condition, 120 mesh richness iron oxide red soil 20kg and 120 mesh are added into the mixture that step 2) obtains
Pyrolusite powder 5kg, mixes well 30min；
4) stop stir mixing machine, the wet feed that step 3) is obtained is packed into kiln saggar, roasts in fuel gas table kiln, dries
Dry section temperature is 110 ± 10 DEG C, drying heat preservation 2h, and drying section is warming up to furnace zone 0.5h, and 380 DEG C of furnace zone temperature control is permanent
Place arsenic cadmium composite passivant is finally made in warm 3h, kiln discharge after cooling.
The application of above-mentioned place arsenic cadmium composite passivant:
Take preparatory certain the Compound Heavy Metals place soil for crossing 2mm sieve of 100g (butt), soil pH 7.6.According to " Gu
Body waste Leaching leaching method horizontal vibration method " (HJ 557-2010), measuring arsenic in soil leaching concentration is 0.058mg/L,
Cadmium leaching concentration is 0.012mg/L, and lead leaching concentration is 0.171mg/L, exceeds " groundwater quality standard " (GB/T
14848-2017) V class limit value.It will be placed in extraction flask for examination soil, the place for accounting for the above-mentioned preparation of soil quality 3% is added
Arsenic cadmium composite passivant, mixes well.According to HJ 557-2010, required digestion agent is calculated by liquid-solid ratio 10:1 (L/kg)
Volume is added secondary analysis use for laboratory water (GB/T 6682), is vertically fixed on horizontal shaking device after covering tightly bottle cap.It adjusts
Section frequency of oscillation is 120rpm, amplitude 40mm, removes extraction flask after vibrating 8h at room temperature, stands 16h.In Suction filtration device
0.45 μm of miillpore filter is installed, leachate is filtered and collect, test arsenic concentration is 0.002mg/L, and cadmium is not detected, and lead concentration is
0.007mg/L is lower than " groundwater quality standard " (GB/T 14848-2017) III class limit value, compared to native soil arsenic, cadmium, lead leaching
Concentration reduces 96% or more out.
Embodiment 3
A kind of place arsenic cadmium composite passivant is prepared using following technique:
1) 120 mesh diatomite 35kg are weighed to be put into stir mixing machine, the 100g/L ferrous sulfate solution of 35L is added, opens
Stirring is opened, 120rpm is thoroughly mixed 40min；
2) it is added into the suspension that step 1) obtains under 120 mesh quick lime 25kg, 120rpm stirring conditions and reacts 45min；
3) under 120rpm stirring condition, 150 mesh richness iron oxide red soil 30kg and 200 mesh are added into the mixture that step 2) obtains
Pyrolusite powder 10kg, mixes well 45min；
4) stop stir mixing machine, the wet feed that step 3) is obtained is packed into kiln saggar, roasts in fuel gas table kiln, dries
Dry section temperature is 110 ± 10 DEG C, and drying heat preservation 2.5h, drying section is warming up to furnace zone 0.5h, and furnace zone temperature controls 450 DEG C,
Place arsenic cadmium composite passivant is finally made in constant temperature 2h, kiln discharge after cooling.
The application of above-mentioned place arsenic cadmium composite passivant:
Take preparatory certain the Compound Heavy Metals place soil for crossing 2mm sieve of 100g (butt), soil pH 6.5.According to " Gu
Body waste Leaching leaching method horizontal vibration method " (HJ 557-2010), measuring arsenic in soil leaching concentration is 0.007mg/L,
Cadmium leaching concentration is 0.047mg/L, and Cr VI leaching concentration is 0.041mg/L, and wherein cadmium leaching concentration exceeds " groundwater quality
Standard " (GB/T 14848-2017) V class limit value.It will be placed in extraction flask for examination soil, the place for accounting for soil quality 4% is added
Arsenic cadmium composite passivant, mixes well.According to HJ 557-2010, required digestion agent is calculated by liquid-solid ratio 10:1 (L/kg)
Volume is added secondary analysis use for laboratory water (GB/T 6682), is vertically fixed on horizontal shaking device after covering tightly bottle cap.It adjusts
Section frequency of oscillation is 120rpm, amplitude 40mm, removes extraction flask after vibrating 8h at room temperature, stands 16h.In Suction filtration device
Install 0.45 μm of miillpore filter, filter and collect leachate, test arsenic, cadmium, Cr VI leaching concentration be respectively 0.002mg/L,
0.003mg/L, 0.007mg/L are lower than " groundwater quality standard " (GB/T 14848-2017) III class limit value, compare native soil
Arsenic, cadmium, Cr VI leaching concentration reduce 71.4%, 93.6% and 82.9% respectively.
Comparative example 1
A kind of place arsenic cadmium composite passivant is prepared using following technique:
1) it weighs 100 mesh calcium-base bentonite 40kg to be put into stir mixing machine, the 100g/L ferrous sulfate that 40L is added is molten
Liquid, opens stirring, and 150rpm is thoroughly mixed 30min；
2) it is added into the suspension that step 1) obtains under 200 mesh quick lime 10kg, 150rpm stirring conditions and reacts 30min；
3) under 150rpm stirring condition, 100 mesh richness iron oxide red soil 30kg and 100 mesh are added into the mixture that step 2) obtains
Pyrolusite powder 20kg, mixes well 40min；
4) stop stir mixing machine, the wet feed that step 3) is obtained is packed into kiln saggar, roasts in fuel gas table kiln, dries
Dry section temperature is 110 ± 10 DEG C, drying heat preservation 3h, and drying section is warming up to furnace zone 0.5h, and 400 DEG C of furnace zone temperature control is permanent
Place arsenic cadmium composite passivant is finally made in warm 2h, kiln discharge after cooling.
A kind of application of place arsenic cadmium composite passivant:
Take preparatory certain the Compound Heavy Metals place soil for crossing 2mm sieve of 100g (butt), soil pH 8.5.According to " Gu
Body waste Leaching leaching method horizontal vibration method " (HJ 557-2010), measuring arsenic in soil leaching concentration is 0.067mg/L,
Cadmium leaching concentration is 0.018mg/L, exceeds " groundwater quality standard " (GB/T 14848-2017) V class limit value.It will be for examination
Soil is placed in extraction flask, and the place arsenic cadmium composite passivant for accounting for soil quality 4% is added, mixes well.According to HJ 557-
2010, the volume of required digestion agent is calculated by liquid-solid ratio 10:1 (L/kg), and secondary analysis use for laboratory water (GB/T is added
6682) it is vertically fixed on horizontal shaking device after, covering tightly bottle cap.Adjusting frequency of oscillation is 120rpm, amplitude 40mm, in room
Extraction flask is removed after the lower oscillation 8h of temperature, stands 16h.0.45 μm of miillpore filter is installed in Suction filtration device, filters and collects leaching
Liquid, test arsenic, cadmium leaching concentration are respectively 0.005mg/L and 0.006mg/L, and wherein cadmium leaching concentration is still higher than " groundwater quality
Amount standard " (GB/T 14848-2017) III class limit value.
Comparative example 2
A kind of place arsenic cadmium composite passivant is prepared using following technique:
1) 200 mesh attapulgite 14kg are weighed, 200 mesh sepiolite 7kg are put into stir mixing machine, the 40g/L of 21L is added
Ferrous sulfate solution, opens stirring, and 200rpm is thoroughly mixed 20min；
2) it is added into the suspension that step 1) obtains under 100 mesh quick lime 30kg, 200rpm stirring conditions and reacts 35min；
3) under 200rpm stirring condition, 120 mesh richness iron oxide red soil 45kg and 120 mesh are added into the mixture that step 2) obtains
Pyrolusite powder 4kg, mixes well 30min；
4) stop stir mixing machine, the wet feed that step 3) is obtained is packed into kiln saggar, roasts in fuel gas table kiln, dries
Dry section temperature is 110 ± 10 DEG C, drying heat preservation 2h, and drying section is warming up to furnace zone 0.5h, and 380 DEG C of furnace zone temperature control is permanent
Place arsenic cadmium composite passivant is finally made in warm 3h, kiln discharge after cooling.
A kind of application of place arsenic cadmium composite passivant:
Take preparatory certain the Compound Heavy Metals place soil for crossing 2mm sieve of 100g (butt), soil pH 7.6.According to " Gu
Body waste Leaching leaching method horizontal vibration method " (HJ 557-2010), measuring arsenic in soil leaching concentration is 0.058mg/L,
Cadmium leaching concentration is 0.012mg/L, and lead leaching concentration is 0.171mg/L, exceeds " groundwater quality standard " (GB/T
14848-2017) V class limit value.It will be placed in extraction flask for examination soil, the place arsenic cadmium that addition accounts for soil quality 3% is compound blunt
Agent mixes well.According to HJ 557-2010, the volume of required digestion agent is calculated by liquid-solid ratio 10:1 (L/kg), is added two
Grade water for analytical laboratory use (GB/T 6682), is vertically fixed on horizontal shaking device after covering tightly bottle cap.Adjusting frequency of oscillation is
120rpm, amplitude 40mm remove extraction flask after vibrating 8h at room temperature, stand 16h.Installed in Suction filtration device 0.45 μm it is micro-
Hole filter membrane, filters and collects leachate, test arsenic, cadmium, lead leaching concentration be respectively 0.015mg/L, 0.004mg/L and
0.013mg/L, wherein arsenic, lead leaching concentration are still higher than " groundwater quality standard " (GB/T 14848-2017) III class limit value.
Comparative example 3
Market Compound Heavy Metals passivator, by 25 parts of charcoals, 20 parts of bentonites, 18 parts of flyash, 14 parts of red muds, 10
Part Nanoscale Iron, 5 parts of calcium magnesium phosphate are blended.
Take preparatory certain the Compound Heavy Metals place soil for crossing 2mm sieve of 100g (butt), soil pH 8.5.According to " Gu
Body waste Leaching leaching method horizontal vibration method " (HJ 557-2010), measuring arsenic in soil leaching concentration is 0.067mg/L,
Cadmium leaching concentration is 0.018mg/L, exceeds " groundwater quality standard " (GB/T 14848-2017) V class limit value.It will be for examination
Soil is placed in extraction flask, and the place arsenic cadmium composite passivant for accounting for soil quality 4% is added, mixes well.According to HJ 557-
2010, the volume of required digestion agent is calculated by liquid-solid ratio 10:1 (L/kg), and secondary analysis use for laboratory water (GB/T is added
6682) it is vertically fixed on horizontal shaking device after, covering tightly bottle cap.Adjusting frequency of oscillation is 120rpm, amplitude 40mm, in room
Extraction flask is removed after the lower oscillation 8h of temperature, stands 16h.0.45 μm of miillpore filter is installed in Suction filtration device, filters and collects leaching
Liquid, test arsenic, cadmium leaching concentration are respectively 0.017mg/L and 0.006mg/L, and arsenic, cadmium leaching concentration are still higher than " groundwater quality
Standard " (GB/T 14848-2017) III class limit value.
It is above-mentioned to be retouched in detail referring to embodiment to what a kind of place arsenic cadmium composite passivant, preparation method and applications carried out
It states, is illustrative without being restrictive, several embodiments can be enumerated according to limited range, therefore do not departing from this
Change and modification under invention general plotting should belong within protection scope of the present invention.
Claims (10)
1. a kind of preparation method of place arsenic cadmium composite passivant, which is characterized in that the preparation method comprises the following steps:
1) adobe is added in ferrous sulfate aqueous solution, is stirred to react；
2) it is obtained in system to step 1) and quick lime is added, be stirred to react；
3) under stirring condition, rich iron oxide red soil and pyrolusite powder is added into the mixture that step 2) obtains, is stirred；
4) after the wet feed drying obtained step 3), calcining is cooling to get place arsenic cadmium composite passivant.
2. preparation method according to claim 1, which is characterized in that adobe and ferrous sulfate aqueous solution in step 1)
Amount ratio be 1:1~3:2kg/L.
3. preparation method according to claim 1 or 2, which is characterized in that adobe described in step 1) is selected from natural
One of attapulgite, bentonite, sepiolite or diatomite are a variety of.
4. preparation method according to claim 1 or 2, which is characterized in that the ferrous sulfate aqueous solution mass concentration is
60~120g/L.
5. preparation method according to claim 1 or 2, which is characterized in that the soil of richness iron oxide red described in step 3), Fe2O3Content
It is 5.0~5.5 not less than 5%, pH；The pyrolusite powder, MnO2Content is not less than 60%.
6. preparation method according to claim 1-5, which is characterized in that adobe, quick lime, rich iron oxide red soil
Quality with pyrolusite powder is 35~45:25~40:20~30:5~15.
7. preparation method according to claim 1 or 6, which is characterized in that step 4) specifically: first in 110 ± 10 DEG C of temperature
The lower drying 2~3h of heat preservation of degree, then, 0.5h is warming up to 350~550 DEG C, 2~4h is roasted at this temperature, finally, being cooled to room
Temperature is to get place arsenic cadmium composite passivant.
8. a kind of place arsenic cadmium composite passivant that the described in any item preparation methods of claim 1-7 are prepared.
9. a kind of application for the place arsenic cadmium composite passivant that the described in any item preparation methods of claim 1-7 are prepared,
For arsenic cadmium combined pollution site remediation.
10. application according to claim 9, which is characterized in that concrete application method are as follows: place arsenic cadmium composite passivant is used
Amount is the 3%~5% of butt soil quality, is kept the skin wet to soil to saturated aqueous when use, and passivator is abundant with soil
It mixes, conserves 5~7d.
Priority Applications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110016345A (en) * | 2019-04-24 | 2019-07-16 | 广西博世科环保科技股份有限公司 | A kind of steady arsenic soil passivator of drop cadmium and its application method |
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| CN110079323A (en) * | 2019-04-30 | 2019-08-02 | 湖南省和清环境科技有限公司 | A kind of arsenic, nickel combined pollution place soil remediation stabilizer and its processing method |
| CN111676023A (en) * | 2020-05-27 | 2020-09-18 | 永清环保股份有限公司 | Semi-wrapping stabilizing material and preparation method and use method thereof |
| CN111748353A (en) * | 2020-07-23 | 2020-10-09 | 北京中耕绿洲生态科技有限公司 | Heavy metal composite passivator and preparation method and application thereof |
| CN113151981A (en) * | 2021-04-09 | 2021-07-23 | 南通大学 | Arsenic removal membrane for drinking water and preparation method thereof |
| CN113151981B (en) * | 2021-04-09 | 2022-04-01 | 南通大学 | Arsenic removal membrane for drinking water and preparation method thereof |
| CN114574208A (en) * | 2022-04-19 | 2022-06-03 | 福建龙净环保股份有限公司 | Soil passivator and preparation method and application thereof |
| CN114574208B (en) * | 2022-04-19 | 2024-05-28 | 福建龙净环保股份有限公司 | Soil passivating agent and preparation method and application thereof |
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