CN108746190A - A kind of in-situ immobilization passivating material of heavy metal pollution of soil - Google Patents
A kind of in-situ immobilization passivating material of heavy metal pollution of soil Download PDFInfo
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- CN108746190A CN108746190A CN201810666178.8A CN201810666178A CN108746190A CN 108746190 A CN108746190 A CN 108746190A CN 201810666178 A CN201810666178 A CN 201810666178A CN 108746190 A CN108746190 A CN 108746190A
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- soil
- heavy metal
- ferronickel slag
- metal pollution
- passivating material
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The present invention provides a kind of in-situ immobilization passivating material of heavy metal pollution of soil, belongs to soil remediation and solid waste utilizes technical field.The material be active nickel scum micro mist, by by water quenching ferronickel slag drying, ore grinding to d90It is more than 430m less than 70 μm, specific surface area2/ kg obtains the in-situ immobilization passivating material of heavy metal pollution of soil of the activity index more than 60%.The Main chemical component of ferronickel slag used is SiO245-55%, Al2O33.0-4.0%, Fe2O36.0-11.0%, CaO 1.5-12.5%, MgO 15-30%, P2O50-0.2%, Na2O 0-0.20%, K2O 0-0.20%.The present invention is using active nickel scum micro mist as raw material, make full use of the activity of ferronickel slag and its passivation reaction ability with heavy metal ion, ferronickel slag is prepared into the in-situ passivation restoring material of heavy metal-polluted soil, fully to dissolve the ferronickel slag constantly generated, also a kind of cheap material being passivated wherein heavy metal and active nutrient component is provided for soil plant growth is provided for soil.
Description
Technical field
The present invention relates to soil remediations and solid waste to utilize technical field, particularly relates to a kind of original position of heavy metal pollution of soil
Repair passivating material.
Background technology
Heavy metal pollution of soil has become the great agricultural ecological environment of extensive concern, is passed through to modern agriculture and society
Sustainable development, agroecological environment and the agricultural product quality and safety of Ji, which constitute, to be seriously threatened.Cadmium (Cd2+) it is state key prison
One of five kinds of heavy metal pollution of soil objects of control mainly pass through the way such as use of metal smelt, sewage irrigation and fertilizer and pesticide
Diameter enters soil, and bio-toxicity is strong, and with irreversible and cannot be degraded, the characteristics such as be easily enriched in organism.The mankind are long
Phase is taken in by the food of cadmium pollution, and cadmium can enter human body by food chain, causes human organ failure, osteoporosis softening.
According to statistics, cadmium pollution soil area in China's is up to 200,000 km2, and have the tendency that running down, it is public to produce " cadmium rice " etc.
Health event.Therefore, the improvement and reparation of heavy metal cadmium soil are very urgent.
Currently, the improvement of heavy-metal contaminated soil and recovery technique include two major classes：First, by changing heavy metal in soil
Existing forms in earth reduce its mobility and biological effectiveness in the soil；Second is that removing removing heavy metals from soil, make it
It retains concentration and is close to or up to soil background.The improvement of more heavy-metal contaminated soil is carried out both at home and abroad and recovery technique is ground
Study carefully, include mainly with visitor turn over physical chemistry recovery technique based on the methods of soil removal and replacement, in-situ passivation, elution, electrochemical rehabilitation and
Bioremediation technology based on plant, microorganism and animal.Wherein, in-situ passivation recovery technique is by being added into soil
Passivating material changes heavy metal chemism in the soil and occurrence status, to reduce heavy metal biological effectiveness and
Migration reduces a kind of chemical remediation technology of the plant to the absorption of heavy metal.Because its with it is at low cost, easy to operate, take effect
Soon, it is suitble to large area to use and receive significant attention.
The key of in-situ passivation recovery technique is passivating material.Currently, most widely used passivating material is phosphate, carbon
The natural minerals such as hydrochlorate, silicate.Silicate mineral has source wide compared with the above two, can be by improving soil pH, absorption
Heavy metal, introducing silicate and heavy metal ion form the effects that precipitating and change heavy metals formation in soil, reduce its biologically effective
Property and migration.But natural silicate minerals majority is crystalline mineral, and activity is low, and element silicon therein is difficult to as a kind of work
Object nutrient is utilized.
Ferronickel slag is China's the fourth-largest metallurgical slag after scum, slag, red mud, is arranged by smelting ferronickel from red soil nickel ore process
Go out, annual emissions are more than 30,000,000 tons.It is seldom to its comprehensive utilization at present, main research and utilization direction be production cement,
Devitrified glass, concrete, inorganic polymer etc..Ferronickel slag is rich in chemical compositions, the mineral compositions such as Mg, Ca, Si, Al
Amorphous state, therefore it can be used as heavy metal passivating material with larger activity and certain alkalinity, can also be that crop gives birth to
It is long that Si, Mg, Ca, Al isoreactivity nutritional ingredient are provided.Therefore, if ferronickel slag is prepared into a kind of original position of heavy metal pollution of soil
It repairs passivating material to use, then not only can fully dissolve the ferronickel slag constantly generated, also make for heavy metal-polluted soil passivation and soil
Object growth provides a kind of cheap material.
Currently, there is no the research and utilization of the in-situ immobilization passivating material of the heavy metal-polluted soil prepared about ferronickel slag both at home and abroad
Report.
Invention content
The technical problem to be solved in the present invention is to provide a kind of in-situ immobilization passivating materials of heavy metal pollution of soil.
The present invention is using water quenching ferronickel slag as raw material, by the drying of water quenching ferronickel slag, ore grinding to d90Less than 70 μm, large specific surface area
In 430m2/ kg obtains the heavy metal pollution of soil in-situ immobilization passivating material that activity index is more than 60%.
Wherein, water quenching ferronickel slag is obtained solid waste after smelting ferronickel from red soil nickel ore, main chemical compositions SiO2
45-55%, Al2O33.0-4.0%, Fe2O36.0-11.0%, CaO 1.5-12.5%, MgO 15-30%, P2O5 0-
0.0.2%, Na2O 0-0.20%, K2O 0-0.20%.
The granularity of water quenching ferronickel slag is that -3mm accounts for 80% or more.
Ore grinding is dry milling, mog d90=10-65 μm.
The specific surface area of obtained heavy metal pollution of soil in-situ immobilization passivating material is 430-850m2/kg。
The activity index of obtained heavy metal pollution of soil in-situ immobilization passivating material is 60-85%.
Heavy metal pollution of soil repair materials dosage is generally less than the 20% of soil, and soil heavy metal cadmium object concentration is low
In 15mg/kg.
Water quenching ferronickel slag mainly by amorphous state mineral composition, contains only a small amount of hortonolite (Mg2SiO4) and enstatite
(MgSiO2) etc. crystalline minerals.Amorphous state mineral account for 80-90%.There is gel-like structure inside ferronickel slag, show that ferronickel slag has
There is larger reactivity, co-precipitation or suction-operated easily occurs with soil heavy metal ion and heavy metal-polluted soil is made to be passivated, drops
The activity and migration of low heavy metal-polluted soil.By ore grinding, increase the specific surface area of ferronickel slag, it is possible to increase its reactivity and soil
The passivation ability of earth heavy metal.Specific surface area is bigger, and reactivity is bigger, stronger to the passivation ability of heavy metal-polluted soil.
The above-mentioned technical proposal of the present invention has the beneficial effect that：
In said program, using water quenching ferronickel slag as raw material, ferronickel slag fineness and specific surface area are improved by drying, ore grinding,
The activity index of ferronickel slag is improved, the reactivity of ferronickel slag and soil heavy metal ion is enhanced, to be used as heavy metal-polluted soil
In-situ immobilization passivating material use, not only fully dissolve the ferronickel slag largely generated, also be heavy metal-polluted soil be passivated and soil
Plant growth provides a kind of cheap material.The present invention is passivating material using ferronickel slag, has pushed the recycling of ferronickel slag,
Open ferronickel slag soil remediation field new opplication approach.Ferronickel slag active component content is high, can be provided for plant growth
Active nutrient component rich in Si, Mg, Ca, Al etc..Ferronickel slag is Industrial Solid Waste, is processed into the passivation of heavy metal in-situ immobilization
The cost of material is low, and the materials'use method is simple and convenient to operate.
Description of the drawings
Fig. 1 is the preparation of in-situ immobilization passivating material and the technique for applying flow chart of the heavy metal pollution of soil of the present invention；
Fig. 2 is the shape appearance figure of water quenching ferronickel slag of the present invention, wherein (a) is water quenching ferronickel slag outside drawing, is (b) water quenching nickel
The inside gel-like structure of scum；
Fig. 3 is the appearance assumption diagram using ferronickel slag passivating material rehabilitating soil that the embodiment of the present invention 1 provides.
Specific implementation mode
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
The present invention provides a kind of in-situ immobilization passivating material of heavy metal pollution of soil.
As shown in Figure 1, the material using water quenching ferronickel slag as raw material, water quenching ferronickel slag is dried, ore grinding to d90Less than 70 μm,
Specific surface area is more than 430m2/ kg, activity index obtained are more than 60% heavy metal pollution of soil in-situ immobilization passivating material.
The pattern of water quenching ferronickel slag used is as shown in Figure 2.
It is explained with reference to specific embodiment.
Embodiment 1
The drying of ferronickel slag is levigate to d90=64.15 μm, specific surface area 437.2m2/ kg obtains activity index 62.46%
Ferronickel slag passivating material.Ferronickel slag：The artificial soil of cadmium pollution presses 5:100 mass ratioes are configured and are uniformly mixed, and carry out Cd2+It is blunt
Change is handled.When available Cd content is 4.3325mg/kg in contaminated soil, Passivation Treatment 20 days, available Cd content reduces
Total deactivation rate to 2.1285mg/kg, cadmium is 50.87%, and wherein residual form accounts for 40.48%.The pH of soil is increased to after reparation
7.6, cation exchange capacity is increased to 11.829cmol/kg.Utilize the appearance assumption diagram of ferronickel slag passivating material rehabilitating soil
As shown in Figure 3.
Embodiment 2
The drying of ferronickel slag is levigate to d90=64.15 μm, specific surface area 437.2m2/ kg obtains activity index 62.46%
Ferronickel slag passivating material.Ferronickel slag：The artificial soil of cadmium pollution presses 10:100 mass ratioes are configured and are uniformly mixed, and carry out Cd2+'s
Passivation Treatment.When available Cd content is 4.3325mg/kg in contaminated soil, Passivation Treatment 20 days, available Cd content drop
As low as 1.835mg/kg, total deactivation rate of cadmium is 57.65%, and wherein residual form accounts for 45.70%.The pH of soil is increased to after reparation
7.8, cation exchange capacity is increased to 13.97cmol/kg.
Embodiment 3
The drying of ferronickel slag is levigate to d90=44.39 μm, specific surface area 543.30m2/ kg obtains activity index 72.07%
Ferronickel slag passivating material.Ferronickel slag：The artificial soil of cadmium pollution presses 10:100 mass ratioes are configured and are uniformly mixed, and carry out Cd2+'s
Passivation Treatment.When available Cd content is 4.3325mg/kg in contaminated soil, Passivation Treatment 20 days, available Cd content drop
As low as 1.619mg/kg, total deactivation rate of cadmium is 62.63%, and wherein residual form accounts for 54.31%.The pH of soil is increased to after reparation
7.8, cation exchange capacity is increased to 14.85cmol/kg.
Embodiment 4
The drying of ferronickel slag is levigate to d90=10.35 μm, specific surface area 842.90m2/ kg obtains activity index 82.04%
Ferronickel slag passivating material.Ferronickel slag：The artificial soil of cadmium pollution presses 10:100 mass ratioes are configured and are uniformly mixed, and carry out Cd2+'s
Passivation Treatment.When available Cd content is 4.3325mg/kg in contaminated soil, Passivation Treatment 20 days, available Cd content drop
As low as 1.236mg/kg, total deactivation rate of cadmium is 71.47%, and wherein residual form accounts for 58.39%.The pH of soil is increased to after reparation
8.0, cation exchange capacity is increased to 16.53cmol/kg
Embodiment 5
The drying of ferronickel slag is levigate to d90=64.15 μm, specific surface area 437.2m2/ kg obtains activity index 62.46%
Ferronickel slag passivating material.Ferronickel slag：The artificial soil of cadmium pollution presses 20:100 mass ratioes are configured and are uniformly mixed, and carry out Cd2+'s
Passivation Treatment.When available Cd content is 11.829mg/kg in contaminated soil, Passivation Treatment 20 days, available Cd content drop
As low as 4.5375mg/kg, total deactivation rate of cadmium is 61.64%, and wherein residual form accounts for 47.50%.The pH of soil is improved after reparation
To 8.0, cation exchange capacity is increased to 15.88cmol/kg.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of in-situ immobilization passivating material of heavy metal pollution of soil, it is characterised in that：Using water quenching ferronickel slag as raw material, by water
Ferronickel slag of quenching drying, ore grinding to d90It is more than 430m less than 70 μm, specific surface area2/ kg obtains the soil that activity index is more than 60%
The in-situ immobilization passivating material of heavy metal pollution.
2. the in-situ immobilization passivating material of heavy metal pollution of soil according to claim 1, it is characterised in that：The water quenching
Ferronickel slag is obtained solid waste after smelting ferronickel from red soil nickel ore, and the chemical constituent of water quenching ferronickel slag is SiO245-55%,
Al2O33.0-4.0%, Fe2O36.0-11.0%, CaO 1.5-12.5%, MgO 15-30%, P2O50-0.0.2%, Na2O
0-0.20%, K2O 0-0.20%.
3. the in-situ immobilization passivating material of heavy metal pollution of soil according to claim 1, it is characterised in that：The water quenching
The granularity of ferronickel slag is that -3mm accounts for 80% or more.
4. the in-situ immobilization passivating material of heavy metal pollution of soil according to claim 1, it is characterised in that：The ore grinding
For dry milling, mog d90=10-65 μm.
5. the in-situ immobilization passivating material of heavy metal pollution of soil according to claim 1, it is characterised in that：Obtained
The specific surface area of heavy metal pollution of soil in-situ immobilization passivating material is 430-850m2/kg。
6. the in-situ immobilization passivating material of heavy metal pollution of soil according to claim 1, it is characterised in that：Obtained
The activity index of heavy metal pollution of soil in-situ immobilization passivating material is 60-85%.
7. the in-situ immobilization passivating material of heavy metal pollution of soil according to claim 1, it is characterised in that：The soil
Heavy metal pollution repair materials dosage is less than the 20% of soil, and soil heavy metal cadmium object concentration is less than 15mg/kg.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114410974A (en) * | 2021-12-27 | 2022-04-29 | 北京科技大学 | Synchronous stabilizing material for multiple harmful heavy metals in lead smelting slag |
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| CN101664757A (en) * | 2009-09-29 | 2010-03-10 | 农业部环境保护科研监测所 | Method for restoring heavy metal pollution of vegetable field soil with in-situ passivation method |
| CN101664756A (en) * | 2009-09-29 | 2010-03-10 | 农业部环境保护科研监测所 | Passivation material for in-situ restoration of soil polluted by heavy metal, and preparation and use method thereof |
| CN101942562A (en) * | 2010-04-26 | 2011-01-12 | 张夫道 | Harmless treatment technology of main metal tailings |
| CN102962250A (en) * | 2012-12-17 | 2013-03-13 | 浙江省农业科学院 | Method for remedying cadmium (Cd) and lead (Pb) polluted soil by alum pulp in situ |
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2018
- 2018-06-21 CN CN201810666178.8A patent/CN108746190B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101664757A (en) * | 2009-09-29 | 2010-03-10 | 农业部环境保护科研监测所 | Method for restoring heavy metal pollution of vegetable field soil with in-situ passivation method |
| CN101664756A (en) * | 2009-09-29 | 2010-03-10 | 农业部环境保护科研监测所 | Passivation material for in-situ restoration of soil polluted by heavy metal, and preparation and use method thereof |
| CN101942562A (en) * | 2010-04-26 | 2011-01-12 | 张夫道 | Harmless treatment technology of main metal tailings |
| CN102962250A (en) * | 2012-12-17 | 2013-03-13 | 浙江省农业科学院 | Method for remedying cadmium (Cd) and lead (Pb) polluted soil by alum pulp in situ |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114410974A (en) * | 2021-12-27 | 2022-04-29 | 北京科技大学 | Synchronous stabilizing material for multiple harmful heavy metals in lead smelting slag |
| CN114410974B (en) * | 2021-12-27 | 2022-10-18 | 北京科技大学 | Synchronous stabilizing material for multiple harmful heavy metals in lead smelting slag |
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