CN107903902A - One kind is used for agricultural land soil removing heavy metals soil conditioner and preparation method thereof - Google Patents
One kind is used for agricultural land soil removing heavy metals soil conditioner and preparation method thereof Download PDFInfo
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- CN107903902A CN107903902A CN201711175276.3A CN201711175276A CN107903902A CN 107903902 A CN107903902 A CN 107903902A CN 201711175276 A CN201711175276 A CN 201711175276A CN 107903902 A CN107903902 A CN 107903902A
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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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- 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
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
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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
- C09K2101/00—Agricultural use
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- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
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- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses one kind to be used for agricultural land soil removing heavy metals soil conditioner and preparation method thereof.Bentonite is fired, acid activation is handled, again through potassium dihydrogen phosphate modification, the obtained farmland for being used for agricultural land soil removing heavy metals soil conditioner and being directly applied to heavy metal pollution, the content of beary metal in the crops planted thereon can be significantly reduced, and is obviously improved crop yield；When carrying out laboratory test, agricultural land soil removing heavy metals soil conditioner disclosed by the invention is equal up to more than 99% to the removal rate of cadmium, lead, chromium.Possess soil remediation is easy to operate, cost is low, positive effect, can be with long-time service the features such as.
Description
Technical field
The present invention relates to one kind to be used for agricultural land soil removing heavy metals soil conditioner and preparation method thereof.
Background technology
It is one of most important natural resources for human survival that soil, which is, and the important set of human ecological environment
Into part.As economic progress and industrial expansion, the pollutant containing heavy metal enter soil, cause soil by all means
Active Heavy Metals element is significantly exceeded in earth, and soil pollution particularly agricultural land soil Active Heavy Metals are exceeded, can directly result in
Plantation crop heavy metal on soil is exceeded, and can enter human body by way of food chain, so as to be brought to health
Harm.
The contaminated by heavy metals farmland in China there are about 0.15 hundred million hectares at present, account for the 15% of the farmland gross area, China is every
Year by heavy metal pollution up to 15,000,000 tons of grain, because being caused grain drop in production to be up to more than 1,000 ten thousand tons by heavy metal pollution,
More than 200 hundred million yuan of direct economic loss.The national irrigating region carried out according to the Ministry of Agriculture of China is investigated, and is filled in about 1,400,000 hectares of sewage
Qu Zhong, the 64.8% of Irrigation District of Sewage area is accounted for by the land area of heavy metal pollution, and wherein slight pollution accounts for 46.7%, in
Degree pollution accounts for 9.7%, and that seriously pollutes accounts for 8.4%, wherein maximum with Hg and Cd contaminated areas.Investigated according to State Environmental Protection Administration
The developed areas such as display, Pearl River Delta, the Yangtze River Delta, Circum-Bohai Sea, middle part, all suffer from serious heavy metal pollution of soil
Problem.After heavy metal can enter human body by food chain, it is enriched with human body.Cause the generation of the work disease of people, lake
Cadmium rice event, the exceeded event of the children blood lead in Zhejiang, the Guangxi exceeded event of reservoir cadmium on the ground such as south are all heavy metal pollution pair
People influences harm and concentrates outburst.
The method of restoration of soil polluted by heavy metal has peripheral doses, chemical remediation, phytoremediation etc., common physics at present
Chemical remediation includes Soil leaching and electro reclamation, chemosetting etc., such as adds lime, apatite, zeolite etc., passes through counterweight
The absorption of metal ion or (common) precipitation change its existing forms in the soil, so as to reduce its biological effectiveness and move
Shifting property.Phytoremediation refers to by certain specific planting on the soil of heavy metal pollution, and this kind of plant is in soil
Pollution element there is special absorption accumulation ability, the heavy metal species can be moved by plant harvest and after being dealt carefully with
Go out the soil body, achieve the purpose that pollution control and restoration of the ecosystem.Physical-chemical process or phytoremediation change in practical applications at present
Good heavy metal pollution soil still suffers from that inconvenient for operation, effect is slowly poor, and soil remediation is of high cost, easily soil is lost fertility
And the features such as hardened.
The content of the invention
In order to solve the above technical problems, the present invention provides one kind be used for agricultural land soil removing heavy metals soil conditioner and its
Preparation method.Described for agricultural land soil removing heavy metals soil conditioner is modified alta-mud, it can be significantly reduced in soil
Content of beary metal while increase soil fertility, possess soil remediation is easy to operate, cost is low, positive effect, can be long-term
The features such as use.
Technical solution provided by the invention is：
A kind of preparation method for agricultural land soil removing heavy metals soil conditioner, the preparation method include following step
Suddenly：
(1) bentonite is roasted, roasting bentonite at high temperature can make bentonite produce substantial amounts of hole；
(2) bentonite after roasting is activated in acid solution, is filtered to remove unnecessary acid solution, 180 are crushed to after filter residue and drying
Mesh, the bentonite after being activated；Acid activation processing, which can remove, to be distributed in the essential mineral montmorillonite passage of bentonite composition
Impurity, such as mix organic matter therein, dredged duct, further open the hole do not opened after roasting, further carry
Its high surface area；
(3) bentonite after activation is mixed with potassium dihydrogen phosphate, stirs 10~40min, it is sufficiently mixed suction
It is wet；
(4) step (3) mixed into the good material drying of moisture absorption, be ground into 180 mesh powders, you can be used for agriculture described in obtaining
Field soil removing heavy metals soil conditioner.
In the step (1), the temperature of roasting is 450~850 DEG C, and the time is 2~3h.The temperature of roasting need to control
Within the scope of 450~850 DEG C, if the too low hole formation of temperature is less, if the excessive hole that easily causes of temperature caves in.
In the step (2), the volumetric concentration of acid solution is 1~5%；Acid solution is 1.5~2 with bentonitic mass ratio：
1。
In the step (2), acid solution is the aqueous solution of nitric acid that volumetric concentration is 1%.
Dry in mesh belt dry kiln in the step (2), dry temperature is 120~180 DEG C, and the time is 1~4h.
In the step (3), the volumetric concentration of potassium dihydrogen phosphate is 10~30%, is preferably 20%；After activation
The mass ratio of bentonite and potassium dihydrogen phosphate is 3:1.5~2.5.
It is dry in mesh belt dry kiln in the step (4), 100~180 DEG C of drying temperature, 2~4h of time.
Present invention also offers what is be prepared according to above-mentioned preparation method to be used for agricultural land soil removing heavy metals soil conditioning
Agent, when it is applied to the farmland improvement of heavy metal pollution, amount of application is 50~500kg/ mus.
Provided by the present invention in the preparation method of agricultural land soil removing heavy metals soil conditioner, bentonite is fired,
Acid activation processing, be modified through potassium dihydrogen phosphate again, and what is obtained is directly applied to for agricultural land soil removing heavy metals soil conditioner
On the farmland of heavy metal pollution, the content of beary metal in the crops planted thereon can be significantly reduced, and be obviously improved crops
Yield；When carrying out laboratory test, modified alta-mud soil conditioner disclosed by the invention is equal to the removal rate of cadmium, lead, chromium
Up to more than 99%.
Compared with prior art, provided by the present invention for the preparation method letter of agricultural land soil removing heavy metals soil conditioner
Singly, it is easy to operate during progress soil remediation, when being repaired to heavy metal pollution of soil, the gas permeability and fertilizer of soil can be increased
Power, significantly reduces the content of beary metal in crops, and dramatically increases the yield of crops.
Embodiment
With reference to embodiment, the present invention is described in detail.
Bentonite and potassium dihydrogen phosphate technical indicator used in the present invention are respectively as shown in table 1, table 2：
1 bentonite technical indicator of table
| Composition title | Technical requirement |
| Bentonite | Smectite content ＞ 85% |
| Mercury (Hg) | ＜ 4mg/kg |
| Cadmium (Cd) | ＜ 9mg/kg |
| Lead (Pb) | ＜ 45mg/kg |
| Chromium (Cr) | ＜ 45mg/kg |
| Arsenic (As) | ＜ 4mg/kg |
| Particle diameter | 200 mesh percent of pass are more than 95% |
2 potassium dihydrogen phosphate technical indicator of table
| Composition title | Technical requirement |
| Potassium dihydrogen phosphate | ＞ 95% |
| Mercury (Hg) | ＜ 4mg/kg |
| Cadmium (Cd) | ＜ 9mg/kg |
| Lead (Pb) | ＜ 45mg/kg |
| Chromium (Cr) | ＜ 45mg/kg |
| Arsenic (As) | ＜ 4mg/kg |
Embodiment 1
A kind of preparation method for agricultural land soil removing heavy metals soil conditioner, comprises the following steps：
(1) choose the bentonite for meeting above-mentioned technical indicator and roast 2.5h in 600 DEG C in high temperature kiln；
(2) bentonite after roasting is activated in the volumetric concentration of 1.5 times of quality is 1% aqueous solution of nitric acid, passed through
Slip drying press is filtered to remove unnecessary acid solution, filter residue in mesh belt dry kiln in 140 DEG C of dry 2h, after be crushed to 180 mesh, activated
Bentonite afterwards；
(3) bentonite after activation is mixed with the potassium dihydrogen phosphate aqueous solution that volumetric concentration is 20%, both quality
The ratio between be 3:2.5, stirring 30min makes it be sufficiently mixed moisture absorption；
(4) step (3) is mixed into the good material of moisture absorption in mesh belt dry kiln in 140 DEG C of dry 3h, is ground into 180 purposes
Powder, you can be used for agricultural land soil removing heavy metals soil conditioner described in obtaining.
Laboratory is tested：Certain density cadmium-ion solution, lead ion solution, chromium ion solution 200ml are prepared respectively, point
Not with 1g the present embodiment obtain be used for agricultural land soil removing heavy metals soil conditioner absorption 1 it is small when, and the final gold of test respectively
Belong to the concentration of ion, test result is as shown in table 3：
Table 3
| Metal ion | Concentration before absorption | Concentration after absorption | Removal rate |
| Cadmium (Cd) | 210.0ppm | 0.12ppm | 99.94% |
| Lead (Pd) | 190.5ppm | 0.02ppm | 99.98% |
| Chromium (Cr) | 200.1ppm | 0.36ppm | 99.82% |
Agricultural land soil is tested：Two pieces of plot rice cultivations with homalographic are marked off in contaminated by heavy metals rice field,
Sowed in one plot and manufactured in the present embodiment be as experimental group, amount of application for agricultural land soil removing heavy metals soil conditioner
60kg/ mus；The agricultural land soil removing heavy metals soil conditioner manufactured in the present embodiment that is used for is not applied in another plot as control
Both groups, other planting conditions all same.After rice good harvest, the cadmium content in the yield to rice and rice carries out respectively
Test, test result are as shown in table 4：
Table 4
| Test event | Cadmium content in rice | Relative to the drop cadmium rate of control group | Rice yield | Relative to the rate of growth of control group |
| Control group | 1.8ppm | 705kg/ mus | ||
| Experimental group | 0.02ppm | 98.89% | 802kg/ mus | 13.7% |
Embodiment 2
A kind of preparation method for agricultural land soil removing heavy metals soil conditioner, comprises the following steps：
(1) choose the bentonite for meeting above-mentioned technical indicator and roast 3h in 450 DEG C in high temperature kiln；
(2) bentonite after roasting is activated in the volumetric concentration of 1.5 times of quality is 4% aqueous hydrochloric acid solution, passed through
Slip drying press is filtered to remove unnecessary acid solution, filter residue in mesh belt dry kiln in 120 DEG C of dry 4h, after be crushed to 180 mesh, activated
Bentonite afterwards；
(3) bentonite after activation is mixed with the potassium dihydrogen phosphate aqueous solution that volumetric concentration is 15%, both quality
The ratio between be 3:2.5, stirring 40min makes it be sufficiently mixed moisture absorption；
(4) step (3) is mixed into the good material of moisture absorption in mesh belt dry kiln in 100 DEG C of dry 4h, is ground into 180 purposes
Powder, you can be used for agricultural land soil removing heavy metals soil conditioner described in obtaining.
Laboratory is tested：Certain density cadmium-ion solution, lead ion solution, chromium ion solution 200ml are prepared respectively, point
Not with 1g the present embodiment obtain be used for agricultural land soil removing heavy metals soil conditioner absorption 1 it is small when, and the final gold of test respectively
Belong to the concentration of ion, test result is as shown in table 5：
Table 5
| Metal ion | Concentration before absorption | Concentration after absorption | Removal rate |
| Cadmium (Cd) | 210.0ppm | 0.12ppm | 99.94% |
| Lead (Pd) | 190.5ppm | 0.04ppm | 99.98% |
| Chromium (Cr) | 200.1ppm | 0.33ppm | 99.84% |
Agricultural land soil is tested：Two pieces of plot with homalographic are marked off in contaminated by heavy metals farmland and plant wheat,
It is as experimental group, amount of application for agricultural land soil removing heavy metals soil conditioner using manufactured in the present embodiment in one plot
72kg/ mus；The agricultural land soil removing heavy metals soil conditioner manufactured in the present embodiment that is used for is not applied in another plot as control
Both groups, other planting conditions all same.After wheat good harvest, the lead content in the yield to wheat and wheat carries out respectively
Test, test result are as shown in table 6：
Table 6
| Test event | Lead content in wheat | Relative to the drop lead rate of control group | Wheat yield | Relative to the rate of growth of control group |
| Control group | 1.53ppm | 410kg/ mus | ||
| Experimental group | 0.03ppm | 98.04% | 489kg/ mus | 19.3% |
Embodiment 3
A kind of preparation method for agricultural land soil removing heavy metals soil conditioner, comprises the following steps：
(1) choose the bentonite for meeting above-mentioned technical indicator and roast 2h in 850 DEG C in high temperature kiln；
(2) bentonite after roasting is activated in the volumetric concentration of 1.8 times of quality is 3% aqueous sulfuric acid, passed through
Slip drying press is filtered to remove unnecessary acid solution, filter residue in mesh belt dry kiln in 180 DEG C of dry 1h, after be crushed to 180 mesh, activated
Bentonite afterwards；
(3) bentonite after activation is mixed with the potassium dihydrogen phosphate aqueous solution that volumetric concentration is 30%, both quality
The ratio between be 3:1.5, stirring 30min makes it be sufficiently mixed moisture absorption；
(4) step (3) is mixed into the good material of moisture absorption in mesh belt dry kiln in 180 DEG C of dry 2h, is ground into 180 purposes
Powder, you can be used for agricultural land soil removing heavy metals soil conditioner described in obtaining.
Laboratory is tested：Certain density cadmium-ion solution, lead ion solution, chromium ion solution 200ml are prepared respectively, point
Not with 1g the present embodiment obtain be used for agricultural land soil removing heavy metals soil conditioner absorption 1 it is small when, and the final gold of test respectively
Belong to the concentration of ion, test result is as shown in table 7：
Table 7
Agricultural land soil is tested：Two pieces of plot maize plantings with homalographic are marked off in contaminated by heavy metals rice field,
It is as experimental group, amount of application for agricultural land soil removing heavy metals soil conditioner using manufactured in the present embodiment in one plot
80kg/ mus；The agricultural land soil removing heavy metals soil conditioner manufactured in the present embodiment that is used for is not applied in another plot as control
Both groups, other planting conditions all same.After Corn Harvest, the cadmium content in the yield to corn and corn carries out respectively
Test, test result are as shown in table 8：
Table 8
| Test event | Cadmium content in corn | Relative to the drop cadmium rate of control group | Corn yield | Relative to the rate of growth of control group |
| Control group | 2.4ppm | 542kg/ mus | ||
| Experimental group | 0.04ppm | 98.33% | 610kg/ mus | 12.5% |
It is above-mentioned to be used for what agricultural land soil removing heavy metals soil conditioner and preparation method thereof carried out to a kind of with reference to embodiment
It is described in detail, is illustrative rather than limited, several embodiments can be included according to limited scope, therefore not
Depart from changing and modifications under present general inventive concept, should belong within protection scope of the present invention.
Claims (7)
- A kind of 1. preparation method for agricultural land soil removing heavy metals soil conditioner, it is characterised in that the preparation method bag Include following steps：(1) bentonite is roasted；(2) bentonite after roasting is activated in acid solution, is filtered to remove unnecessary acid solution, 180 mesh are crushed to after filter residue and drying, are obtained Bentonite after to activation；(3) bentonite after activation is mixed with potassium dihydrogen phosphate, stirs 10~40min, it is sufficiently mixed moisture absorption；(4) step (3) mixed into the good material drying of moisture absorption, be ground into 180 mesh powders, you can obtained the agricultural land soil and remove Heavy metal soil conditioner.
- 2. preparation method according to claim 1, it is characterised in that in the step (1), the temperature of roasting for 450~ 850 DEG C, the time is 2~3h.
- 3. preparation method according to claim 1, it is characterised in that in the step (2), the volumetric concentration of acid solution is 1 ~5%；Acid solution is 1.5~2 with bentonitic mass ratio：1.
- 4. the preparation method according to claim 1 or 3, it is characterised in that in the step (2), acid solution is volumetric concentration For 1% aqueous solution of nitric acid.
- 5. preparation method according to claim 1, it is characterised in that in the step (3), the body of potassium dihydrogen phosphate Product concentration is 10~30%；The mass ratio of bentonite and potassium dihydrogen phosphate after activation is 3:1.5~2.5.
- 6. preparation method according to claim 1, it is characterised in that in the step (4), done in mesh belt dry kiln It is dry, 100~180 DEG C of drying temperature, 2~4h of time.
- 7. the agricultural land soil removing heavy metals soil conditioner that preparation method according to claim 1 is prepared.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111019665A (en) * | 2019-12-26 | 2020-04-17 | 甘肃瀚兴环保科技有限公司 | Method for preparing soil passivation material by compounding attapulgite with phosphate by wet process |
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| CN104525123A (en) * | 2014-12-12 | 2015-04-22 | 格丰科技材料有限公司 | Porous composite material for removing heavy metals in soil and preparation method thereof |
| CN104861983A (en) * | 2015-05-07 | 2015-08-26 | 环保桥（湖南）生态环境修复有限公司 | Farmland soil conditioner and preparation method thereof |
| CN106800940A (en) * | 2016-12-30 | 2017-06-06 | 中国农业科学院农业环境与可持续发展研究所 | A kind of soil conditioner and its production and use |
| CN107090292A (en) * | 2017-04-26 | 2017-08-25 | 湖南晨露环保科技发展有限公司 | A kind of soil conditioner for being passivated heavy metals in farmland and preparation method thereof |
-
2017
- 2017-11-22 CN CN201711175276.3A patent/CN107903902A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104525123A (en) * | 2014-12-12 | 2015-04-22 | 格丰科技材料有限公司 | Porous composite material for removing heavy metals in soil and preparation method thereof |
| CN104861983A (en) * | 2015-05-07 | 2015-08-26 | 环保桥（湖南）生态环境修复有限公司 | Farmland soil conditioner and preparation method thereof |
| CN106800940A (en) * | 2016-12-30 | 2017-06-06 | 中国农业科学院农业环境与可持续发展研究所 | A kind of soil conditioner and its production and use |
| CN107090292A (en) * | 2017-04-26 | 2017-08-25 | 湖南晨露环保科技发展有限公司 | A kind of soil conditioner for being passivated heavy metals in farmland and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111019665A (en) * | 2019-12-26 | 2020-04-17 | 甘肃瀚兴环保科技有限公司 | Method for preparing soil passivation material by compounding attapulgite with phosphate by wet process |
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Application publication date: 20180413 |