CN106800933A - A kind of passivator repaired for farmland soil heavy metals combined pollution and its preparation and application - Google Patents
A kind of passivator repaired for farmland soil heavy metals combined pollution and its preparation and application Download PDFInfo
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- CN106800933A CN106800933A CN201710017278.3A CN201710017278A CN106800933A CN 106800933 A CN106800933 A CN 106800933A CN 201710017278 A CN201710017278 A CN 201710017278A CN 106800933 A CN106800933 A CN 106800933A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/04—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only applied in a physical form other than a solution or a grout, e.g. as granules or gases
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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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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
- C05D9/02—Other inorganic fertilisers containing trace elements
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
The present invention relates to a kind of passivator repaired for agricultural land soil cadmium, chromium, copper and mickel heavy-metal composite pollution and its preparation and application.The passivator includes passivator A and passivator B；Passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate；Passivator B includes periclase, calcite, calcium magnesium phosphate, plant ash and calcium hydroxide；The passivator is applied to cadmium, chromium, copper, the agricultural land soil of nickel combined pollution, it is made up of the porous adsorbent and passivation of above-mentioned various unlike materials with certain content, have complementary advantages each other, with reference to the principle such as absorption and stabilisation, by ion exchange, complexing, chelating and adsorption method effectively strengthen the combining form of heavy metal, it is translated into more stable strong organically combine state and residual form, effectively reduce heavy metal bio-available Zn concentration in agricultural land soil, the long-acting stabilization of passivation effect, for cadmium, chromium, copper, the agricultural land soil of nickel combined pollution has great repair.
Description
Technical field
Field is administered the present invention relates to heavy-metal composite pollution agricultural land soil, more particularly to one kind is used for agricultural land soil with much money
Passivator that category combined pollution is repaired and preparation method thereof and application method.
Background technology
The exploitation of mineral resources contributes to local economic development, and ignoring the rough exploitation of environmental ecological benefit certainly will cause
Permanent soil, water, atmosphere pollution；The forties in 20th century, it is dirty that rough mining mineral resource technique causes larger environment
Dye, discarded mining area turns into the pollution sources of left over by history, long-term pollution local environment and health.
Soil is stacked and certainly will pollute periphery as human being's production, the foundation of life, the production of industrial and mineral smeltery and discarded object
Soil, on contaminated soil carrying out Agricultural Activities certainly will form food-safety problem；With《National soil pollution shape
Condition investigates publication》And《Soil Pollution Control action plan》Issue, remediation contaminated soil turn into study hotspot.At present, for
Heavy metal pollution of soil river harnessing ideas carry out the strategy based on risk control by removing heavy metal completely to be changed into.
China's contaminated soil remediation effect is mainly by the total amount value and soil environment quality mark of target contaminant in soil
Standard is compared to evaluation, but real influence soil risk be pollutant bio-available Zn concentration；Therefore, it is former by passivator
Position recovery technique is significant to reduce soil available content of beary metal, and China's agricultural soil heavy metal pollution tool
Have area it is big, with mild or moderate pollution as main the characteristics of, in-situ passivation recovery technique is because of simple to operate, instant effect and suitable large area
Pollution control and by extensive concern.
The method that existing many patents disclose remediation contaminated soil：Such as the A of Chinese invention patent application CN 102559198
It is primary raw material to disclose with low grade rock phosphate, and ammonium oxalate is mixed and made into passivator for raw material, for being passivated copper, lead, cadmium
Combined pollution farmland, although its technique is easy, and cost is relatively low, but the reduction soil that this phosphoric acid salt passivator may be faint
PH value, causes some ionic state content of beary metal to increase；And phosphoric acid salt passivator is to the passivation effect and weight of contaminated soil
There are much relations metal species, soil property, water content, repair time, the application of phosphoric acid salt passivator such as in red soil, copper
Available state reduction is notable, but without positive effect in yellow soil；More clay mineral and iron alumina may be contained with red soil
The variable charge of thing institute band is relevant, and the organic matter that is enriched in yellow soil, cation exchange capacity (CEC) make soil absorbing copper is more in itself,
Phosphatic addition is caused not dramatically increase the absorption of copper.
The A of Chinese invention patent application CN 105950154 disclose one kind by charcoal, red mud, ammonium phosphate by certain ratio
The passivator that example is made, for cadmium, the reparation of lead combined contamination soil, the charcoal needed for this passivator need to be Celsius 350
It is prepared under the conditions of degree high temperature, complex process is relatively costly, is widely popularized difficulty larger.
Chinese invention patent application (A of CN 105542775) discloses one kind by modification biological carbon and rich in calcium, magnesium, silicon
Complex material Deng element prepares passivator, equally exists complex process, relatively costly shortcoming.
Some researchers have inquired into new material for restoration of soil polluted by heavy metal, such as with natural clay as template
After nano materials, using the unique structural property of clay, the nano material of synthesis has the spy that size is small, reactivity is strong
Point, because new material has special surface texture and granularity, just has preferable repairing effect under relatively low amount of application, but
Be this nano material acquisition it is relatively costly in itself, it is unrealistic for spread.
Although the research of passivator is a lot of, have not yet to see relevant Abandoned Land of Mine periphery cadmium, chromium and (take into account six
Valency chromium), copper, the repairing research in the heavy metal species combined pollution farmland of nickel 4.
The content of the invention
It is an object of the present invention to provide a kind of passivator repaired for farmland soil heavy metals combined pollution, this is blunt
Agent can effectively be passivated reparation cadmium, chromium, the agricultural land soil of the heavy metal species combined pollution of copper and mickel four, effectively in reduction agricultural land soil
Heavy metal bio-available Zn concentration, the long-acting stabilization of passivation effect.
It is a further object to provide the above-mentioned passivator repaired for farmland soil heavy metals combined pollution
Method of preparation and use.
In order to achieve the above object, a technical scheme of present invention offer is：There is provided one kind is used for agricultural land soil with much money
The passivator that category combined pollution is repaired, including passivator A and passivator B；
The passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate；The montmorillonite, diatom
The mass ratio of soil, sepiolite, illite and ferrous sulfate is 0.4~2.1：0.8~2.3：0.2~1.6：0.5~2.5：0.6~
2.2；
The passivator B includes periclase, calcite, calcium magnesium phosphate, plant ash and calcium hydroxide；The periclase, side
The mass ratio of Xie Shi, calcium magnesium phosphate, plant ash and calcium hydroxide is 0.2~1.1：0.4~1.6：0.5~1.5：0.3~1.1：
0.4~2.6；
The heavy metal includes cadmium, chromium, copper and mickel.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement：
For the passivator that farmland soil heavy metals combined pollution is repaired, including passivator A and passivator B；
The passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate；The montmorillonite, diatom
The mass ratio of soil, sepiolite, illite and ferrous sulfate is 0.4：1.0：0.2：0.5：0.6；
The passivator B includes periclase, calcite, calcium magnesium phosphate, plant ash and calcium hydroxide；The periclase, side
The mass ratio of Xie Shi, calcium magnesium phosphate, plant ash and calcium hydroxide is 0.2：0.8：0.5：0.3：2.5.
In order to achieve the above object, another technical scheme of present invention offer is：There is provided a kind of for agricultural land soil weight
The preparation method of the passivator that metal combined contamination is repaired, including：
The grinding of montmorillonite, diatomite, sepiolite and illite was crushed to 100 mesh sieves, will be described according to formula rate
Montmorillonite, diatomite, sepiolite, illite and ferrous sulfate mixing after grinding, is obtained passivator A；
Periclase and calcite grinding were crushed to 100 mesh sieves, according to formula rate by the periclase after grinding, Fang Xie
The mixing of stone, calcium magnesium phosphate, plant ash and calcium hydroxide, is obtained passivator B.
In order to achieve the above object, another technical scheme of present invention offer is：It is compound for farmland soil heavy metals
The application method of the passivator of pollution amelioration, including：
In the agricultural land soil of heavy-metal composite pollution, first by passivator A according to every mu of heavy metal of 100~1400kg/
The addition of combined pollution agricultural land soil is uniformly sprinkled upon on farmland, is passivated 1~3 day, and is turned over whirlwind rake or other similar agriculturals
Plough and turned over agricultural machinery, then suitably irrigated, farmland is kept certain moisture；
Passivator B is uniformly sprinkled upon according to the addition of every mu of heavy-metal composite pollution agricultural land soil of 100~1400kg/ again
On farmland, it is passivated 7~28 days, and is turned over and turned over agricultural machinery with whirlwind rake or other similar agriculturals, then is suitably irrigated,
Farmland is set to keep certain moisture, you can to carry out Agricultural Activities.
Wherein, passivator A is first added, and is endangered larger Cr VI and is converted under ferrous reduction and endangers smaller
Trivalent chromium；Passivator B is added again, under alkalescence environment, contributes to ferric iron to generate making with adsorption coprecipitation for complexity
Colloid, passivation trivalent chromium and other heavy metals, and passivator in clay mineral, calcium magnesium phosphate be respectively provided with reduction cadmium, chromium,
The effect of copper, nickel bio-available Zn concentration, alkalescence environment contributes to above-mentioned heavy metal ion to be precipitated to ferrimanganic combination state, hydroxide
Forms Transformation, can effectively reduce heavy metal bio-available Zn concentration.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement：
In the agricultural land soil of heavy-metal composite pollution, passivator A is added first, be passivated 2 days, then add passivator B, it is blunt
Change 20 days, complete the reparation of the agricultural land soil of heavy metal combined pollution；Wherein, the dosage of passivator A is every mu of 500kg/
Heavy-metal composite pollution agricultural land soil, the dosage of passivator B is every mu of heavy-metal composite pollution agricultural land soil of 700kg/.
In passivator formula of the invention, montmorillonite is the layered minerals being made up of the superfine hydrous alumino silicates of particle
Thing, with cation exchange property and absorption property, heavy metal is adsorbed with good effect, while its water imbibition is very strong,
The raising of agricultural land soil water-retaining property after contributing to heavy metal pollution to repair.
Illite is a kind of clay mineral for having layer structure of similar mica, also referred to as hydromuscovite.Heavy metal
The good effect of absorption.
Sepiolite has huge specific surface area and special layer structure, there is good passivation to repair Cd contaminated soils
Multiple effect.
Diatomite has fine and smooth, loose, light weight, porous, water imbibition and the strong property of permeability, and guarantor can be played in soil
Wet, loose soil property, extension drug effect fertilizer efficiency time, encourage crop growth effect, coordinate other formulas of the invention, can play
The long-acting absorption of heavy metal, the effect of fertility sustained release.
Plant ash fertilizer is the ashes after burning plants because of plant ash, so being the mineral element contained by all plants, vegetation
Nearly all contain in ash, agricultural land soil fertility after reparation can be improved.
The main component of industrial ferrous sulfate is FeSO4, with reproducibility, can reduction of hexavalent chromium, reduce Cr VI
Harm, with the ability that co-precipitation is produced with various heavy, the formation with plant chlorophyll, as iron fertilizer, helps to repair
The volume increase of crops after multiple.
Calcium magnesium phosphate contains magnesium-phosphorus fertilizer also known as melting, is that one kind contains phosphate radical (PO43-) sillico aluminate glass body, without bright
True molecular formula and molecular weight；It is rock phosphate in powder with containing magnesium, the ore of silicon, in blast furnace or electric furnace by high-temperature fusion, water quenching,
Dry and formed with levigate；Magnesium is favourable to forming chlorophyll, and silicon can promote the growth of plant fiber tissue, has plant preferably anti-
The ability for only lodging with pest and disease damage；The fertilizer is that the aqueous solution is in alkalescence, can improve acid soil, and the release of its fertility is slow, can
As the long-acting modifying agent that soil fertility improves.
Calcium hydroxide is a kind of white powdery solids, chemical formula Ca (OH)2, white lime or calcium hydroxide are commonly called as, white is solid
Body, is slightly soluble in water, and its aqueous solution is frequently referred to limewash, and in alkalescence, absorbing carbon dioxide and water etc. lead to so as to rotten in atmosphere
Often claiming it has water imbibition.
Periclase hydration rate is slow, and magnesium hydroxide is formed after aquation, and the slow release to passivator is contributed.Calcite chemistry
Composition CaO accounts for 56.03%, CO2 and accounts for 43.97%, often contains Mn and Fe, the effect with buffering soil pH, and supplies crops
Trace element.
Passivator of the invention is applied to cadmium, chromium, copper, the agricultural land soil of nickel combined pollution, and it is contained by above-mentioned with specific
Porous adsorbent and the passivation composition of various unlike materials of amount, have complementary advantages each other, with reference to absorption and stabilisation
Etc. principle, the combining form of heavy metal is effectively strengthened by ion exchange, complexing, chelating and adsorption method, be translated into
More stable strong organically combine state and residual form, effectively reduce heavy metal bio-available Zn concentration in agricultural land soil, and passivation effect is long
Effect stabilization, has great repair for the agricultural land soil of cadmium, chromium, copper, nickel combined pollution.
Passivator of the invention has functions that heavy metal-passivated cadmium, chromium, copper, nickel simultaneously, and can will endanger larger six
Valency chromium is converted into the less trivalent chromium post-passivation of harm；With slow release, agricultural land soil fertility is made moderate progress, passivation effect is long
Effect stabilization；With preferable environment friendly, secondary pollution is not produced；Preparation process is simple, cost is relatively low, should with huge
Use prospect.
Brief description of the drawings
Fig. 1 is passivator heavy metal cadmium, chromium, copper, nickel available state clearance effect curve prepared by the embodiment of the present invention 1
Figure.
Fig. 2 is for examination agricultural land soil pH value change curve after passivator prepared by the embodiment of the present invention 1 is applied.
Fig. 3 is the design sketch after the passivator prepared using the embodiment of the present invention 3 is passivated.
Fig. 4 is the design sketch after the passivator prepared using the embodiment of the present invention 4 is passivated.
Specific embodiment
Principle of the invention and feature are described below in conjunction with accompanying drawing, example is served only for explaining the present invention, and
It is non-for limiting the scope of the present invention.
Embodiment 1：
A kind of passivator repaired for agricultural land soil cadmium, chromium, copper and mickel heavy-metal composite pollution includes passivator A and blunt
Agent B；
Passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate；Montmorillonite, diatomite, Hai Pao
The mass ratio of stone, illite and ferrous sulfate is 0.4：1.0：0.2：0.5：0.6；Passivator B includes periclase, calcite, calcium
Magnesium-phosphorus fertilizer, plant ash and calcium hydroxide；The mass ratio of the periclase, calcite, calcium magnesium phosphate, plant ash and calcium hydroxide is
0.2：0.8：0.5：0.3：2.5.
The preparation method of above-mentioned passivator is：The grinding of montmorillonite, diatomite, sepiolite and illite was crushed to 100
Mesh sieve, mixes the montmorillonite after grinding, diatomite, sepiolite, illite and ferrous sulfate according to formula rate, and passivation is obtained
Agent A；
Periclase and calcite grinding were crushed to 100 mesh sieves, according to formula rate by the periclase after grinding, Fang Xie
The mixing of stone, calcium magnesium phosphate, plant ash and calcium hydroxide, is obtained passivator B.
Embodiment 2：
A kind of passivator repaired for agricultural land soil cadmium, chromium, copper and mickel heavy-metal composite pollution includes passivator A and blunt
Agent B；
Passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate；Montmorillonite, diatomite, Hai Pao
The mass ratio of stone, illite and ferrous sulfate is 1.0：0.8：0.2：0.5：2.2；Passivator B includes periclase, calcite, calcium
Magnesium-phosphorus fertilizer, plant ash and calcium hydroxide；The mass ratio of the periclase, calcite, calcium magnesium phosphate, plant ash and calcium hydroxide is
1.1：1.0：1.3：0.8：0.4.
The preparation method of above-mentioned passivator is：The grinding of montmorillonite, diatomite, sepiolite and illite was crushed to 100
Mesh sieve, mixes the montmorillonite after grinding, diatomite, sepiolite, illite and ferrous sulfate according to formula rate, and passivation is obtained
Agent A；
Periclase and calcite grinding were crushed to 100 mesh sieves, according to formula rate by the periclase after grinding, Fang Xie
The mixing of stone, calcium magnesium phosphate, plant ash and calcium hydroxide, is obtained passivator B.
Embodiment 3：
A kind of passivator repaired for agricultural land soil cadmium, chromium, copper and mickel heavy-metal composite pollution includes passivator A and blunt
Agent B；
Passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate；Montmorillonite, diatomite, Hai Pao
The mass ratio of stone, illite and ferrous sulfate is 2.1：2.3：1.0：2.0：1.8；Passivator B includes periclase, calcite, calcium
Magnesium-phosphorus fertilizer, plant ash and calcium hydroxide；The mass ratio of the periclase, calcite, calcium magnesium phosphate, plant ash and calcium hydroxide is
0.7：1.6：0.9：0.6：2.4.
Embodiment 4：
A kind of passivator repaired for agricultural land soil cadmium, chromium, copper and mickel heavy-metal composite pollution includes passivator A and blunt
Agent B；
Passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate；Montmorillonite, diatomite, Hai Pao
The mass ratio of stone, illite and ferrous sulfate is 0.7：1.6：1.6：2.5：1.3；Passivator B includes periclase, calcite, calcium
Magnesium-phosphorus fertilizer, plant ash and calcium hydroxide；The mass ratio of the periclase, calcite, calcium magnesium phosphate, plant ash and calcium hydroxide is
1.1：1.6：1.5：1.1：2.6.
Embodiment 5：
A kind of passivator repaired for agricultural land soil cadmium, chromium, copper and mickel heavy-metal composite pollution includes passivator A and blunt
Agent B；
Passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate；Montmorillonite, diatomite, Hai Pao
The mass ratio of stone, illite and ferrous sulfate is 0.8：1.9：1.3：0.8：1.1；Passivator B includes periclase, calcite, calcium
Magnesium-phosphorus fertilizer, plant ash and calcium hydroxide；The mass ratio of the periclase, calcite, calcium magnesium phosphate, plant ash and calcium hydroxide is
0.6：1.2：0.8：0.5：0.9.
Embodiment 6：
Abandoned Land of Mine periphery cadmium, chromium, copper, the farmland of nickel combined pollution are taken, the agricultural land soil is taken as examination soil is supplied, certainly
So dry, cross 10 mesh sieves, measure its heavy metal-polluted soil bio-available Zn concentration and pH value, as a result see the table below 1：
Table 1 is for examination agricultural land soil original soil heavy metal bio-available Zn concentration
| Index | Concentration range | Assay method |
| Cadmium | 1.08mg/kg | HJ 804-2016 |
| Chromium | 21.2mg/kg | Without national standard, note is seen |
| Copper | 5.8mg/kg | HJ 804-2016 |
| Nickel | 1.15mg/kg | HJ 804-2016 |
| pH | 5.58 | Potentiometry |
Note：Method of the assay method of available state chromium content with reference to being mentioned in Zhejiang University's Xiao Wendan thesis for the doctorate, the party
Method determines available state chromium and is up to 0.98 with chromium content correlation in pakchoi, rice plants body；Concrete operations are：Weigh 5g and cross 10
The agricultural land soil sample of mesh sieve, adds 50ml Mehlich-3 reagents (0.2mol/L CH3COOH, 0.25mol/LNH4NO3,
0.015mol/L NH4F, 0.013mol/L HNO3, 0.001mol/L EDTA) and 5min is shaken at room temperature, it is centrifuged under 4000 turns
10min, filtering, the chromium content in last supernatant is determined using ICP-MS methods.
The above-mentioned farmland for choosing about 60 mu of serious pollution regions of area is tested, the passivation that embodiment 1 is prepared
Agent is put in the agricultural land soil, and specific applying method is：Passivator A is exerted into this according to the dosage of every mu of 500kg/
In agricultural land soil, turn over, pour, after passivation 2 days, then passivator B is exerted into the farmland according to the dosage of every mu of 700g/
In soil, turn over, after waiting 20 days, its heavy metal bio-available Zn concentration is surveyed in sampling；Result shows：Apply passivator of the invention
Afterwards, heavy metal bio-available Zn concentration is basicly stable, cadmium, chromium, copper and mickel bio-available Zn concentration reduce about 40% respectively, 30%, 50% and
55%；After passivation, soil pH value becomes 6.60 or so, is specifically shown in Fig. 1 and Fig. 2.
Embodiment 7：
Sichuan abandoned location of industry and mining periphery farmland is chosen, pollution type is cadmium, chromium, copper, nickel combined pollution, and non-hexavalent chromium is dirty
Dye, the serious pollution region for being chosen at about 60 mu of area carries out lab scale；Passivator prepared by the embodiment of the present invention 2 is applied to
State in farmland, this passivator A is uniformly applied according to 300kg/ mus of applied amount, turn over, pour, wait 2 days afterwards, according still further to
400kg/ mus of applied amount uniformly applies passivator B, turns over, and normal agricultural production activity is carried out after waiting 10 days.
The samples such as crop harvesting season collection corn, sorghum, pakchoi, asparagus lettuce, Ipomoea batatas, green pepper are some, carry out detection point
Analysis, before being relatively passivated, the region Grain Growth Situation is good, crop yield about 8%, and content of beary metal drops significantly in agricultural sample
It is low, specifically it is shown in Table 2, from Table 2, it can be seen that sample thief content of beary metal all exists《National food safety standard food
Middle pollutant limitation》In GB2762-2012 within relevant criterion limit value.
The some crops acceptance test result of table 2
Embodiment 8：
Choose certain to be tested apart from the farmland region in about 5 kilometers of abandoned location of industry and mining downstream, the regional pollution is lighter, mainly
Based on slight, moderate cadmium, chromium, copper, nickel combined pollution；Passivator prepared by the embodiment of the present invention 3 is applied to above-mentioned farmland
In, uniformly apply passivator A according to 100kg/ mus of applied amount, turn over, pour, wait 1 day afterwards, according still further to 500kg/ mus
Applied amount uniformly applies passivator B, turns over, and normal agricultural production activity is carried out after waiting 7 days.
Crop harvesting season collection corn-like it is some, detected, with engineering reparation before contrasted；From crops
From the point of view of upgrowth situation, before being relatively passivated, the region Grain Growth Situation is good；To gather 168 corn-likes detect, and with
Corn-like detection data average value before engineering reparation is contrasted；Result as shown in figure 3, passivation after corn sample a huge sum of money
Category content is far below《National food safety standard pollutants in food is limited the quantity》Relevant criterion limit value in GB 2762-2012.
Embodiment 9：
Southwest China polluted agricultural land, mainly based on cadmium, pollution of chromium, containing a small amount of nickel contamination, pollution concentration scope is：
Cadmium：0.42~1.86mg/kg, chromium：119~320mg/kg, nickel：30~120mg/kg, soil pH value is mainly based on subacidity；
The polluted farmland soil heavy metal average effective state content is：Cadmium 0.42mg/kg, chromium 12mg/kg, nickel 2.1mg/kg；This is sent out
Passivator prepared by bright embodiment 4 is applied in above-mentioned farmland, and passivator A is uniformly applied according to 1400kg/ mus of applied amount, is turned over
Plough, pour, wait 3 days afterwards, passivator B is uniformly applied according still further to 1400kg/ mus of applied amount, turn over, after waiting 28 days, inspection
Each heavy metal bio-available Zn concentration in soil is surveyed, specifically as shown in Figure 4, figure 4, it is seen that blunt using passivator of the invention
After change, heavy metal-polluted soil bio-available Zn concentration is substantially reduced, and passivator passivation effect of the invention is notable.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (5)
1. a kind of passivator repaired for farmland soil heavy metals combined pollution, it is characterized in that, including passivator A and passivator
B；
The passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate；The montmorillonite, diatomite, sea
The mass ratio of afrodite, illite and ferrous sulfate is 0.4~2.1：0.8~2.3：0.2~1.6：0.5~2.5：0.6~2.2；
The passivator B includes periclase, calcite, calcium magnesium phosphate, plant ash and calcium hydroxide；The periclase, calcite,
The mass ratio of calcium magnesium phosphate, plant ash and calcium hydroxide is 0.2~1.1：0.4~1.6：0.5~1.5：0.3~1.1：0.4~
2.6；
The heavy metal includes cadmium, chromium, copper and mickel.
2. it is according to claim 1 for farmland soil heavy metals combined pollution repair passivator, it is characterized in that, including
Passivator A and passivator B；
The passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate；The montmorillonite, diatomite, sea
The mass ratio of afrodite, illite and ferrous sulfate is 0.4：1.0：0.2：0.5：0.6；
The passivator B includes periclase, calcite, calcium magnesium phosphate, plant ash and calcium hydroxide；The periclase, calcite,
The mass ratio of calcium magnesium phosphate, plant ash and calcium hydroxide is 0.2：0.8：0.5：0.3：2.5.
3. the preparation method of the passivator repaired for farmland soil heavy metals combined pollution described in claim 1 or 2, it is special
Levying is, including：
The grinding of montmorillonite, diatomite, sepiolite and illite was crushed to 100 mesh sieves, according to formula rate by the grinding
The mixing of rear montmorillonite, diatomite, sepiolite, illite and ferrous sulfate, is obtained passivator A；
By periclase and calcite grinding be crushed to 100 mesh sieves, according to formula rate by the periclase after grinding, calcite,
The mixing of calcium magnesium phosphate, plant ash and calcium hydroxide, is obtained passivator B.
4. the application method of the passivator repaired for farmland soil heavy metals combined pollution described in claim 1-2, it is special
Levying is, including：
In the agricultural land soil of heavy-metal composite pollution, passivator A is added first, be passivated 1~3 day, then add passivator B, it is blunt
Change 7~28 days, complete the reparation of the agricultural land soil of heavy metal combined pollution；Wherein, the dosage of passivator A be 100~
Every mu of heavy-metal composite pollution agricultural land soil of 1400kg/, the dosage of passivator B is compound for every mu of heavy metal of 100~1400kg/
Polluted farmland soil.
5. it is according to claim 4 for farmland soil heavy metals combined pollution repair passivator application method, its
It is characterized in, including：
In the agricultural land soil of heavy-metal composite pollution, passivator A is added first, be passivated 2 days, then add passivator B, passivation 20
My god, complete the reparation of the agricultural land soil of heavy metal combined pollution；Wherein, the dosage of passivator A is every mu of huge sum of money of 500kg/
Category combined pollution agricultural land soil, the dosage of passivator B is every mu of heavy-metal composite pollution agricultural land soil of 700kg/.
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