CN110408403A - A kind of antimony pollution soil-repairing agent and preparation method thereof based on clay mineral doping - Google Patents
A kind of antimony pollution soil-repairing agent and preparation method thereof based on clay mineral doping Download PDFInfo
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- CN110408403A CN110408403A CN201910799479.2A CN201910799479A CN110408403A CN 110408403 A CN110408403 A CN 110408403A CN 201910799479 A CN201910799479 A CN 201910799479A CN 110408403 A CN110408403 A CN 110408403A
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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
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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
- C09K2109/00—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE pH regulation
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- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a kind of antimony pollution soil-repairing agent and preparation method thereof based on clay mineral doping, the soil-repairing agent includes the substance of following parts by weight: 35~50 parts of chlorite, 10~25 parts of goethite, 25~40 parts of calcium hydroxide.The preparation method comprises the steps of: a, air-dries chlorite, goethite, calcium hydroxide to moisture content less than 10%, is ground up, sieved, partial size is less than 100 mesh；B, the chlorite, goethite, calcium hydroxide of above-mentioned parts by weight are added in powder mixing machine, degree of being stirred until homogeneous is greater than 95%.Chlorite of the invention is the main component of antimony pollution soil stabilization renovation agent and the main source of iron, is a kind of natural clay mineral, raw material is cheap and easy to get, advantageously reduces antimony pollution soil remediation cost, and environmental-friendly, not will cause secondary pollution.
Description
Technical field
The present invention relates to Environmental Geotechnical recovery project, specially a kind of antimony pollution soil remediation based on clay mineral doping
Agent and preparation method thereof.
Background technique
Antimony (Sb) is a kind of metalloid element with genotoxic potential and carcinogenicity.China is Chan Ti big country, antimony ore reserves
The first in the world is occupied, yield accounts for about the 80% of world wide production.In recent years, due to unreasonable development and utilization, a large amount of antimony enters
Into soil and water body environment, ecological safety and human health are seriously endangered, researches and develops efficient antimony pollution soil restoring technology
It is extremely urgent.
Currently, the recovery technique of antimony pollution soil mainly has Soil leaching, soil displacement, landfill, phytoremediation and stabilization
Change technology.The stabilization technology of antimony pollution soil, which refers to, to be stabilized the biological effectiveness of renovation agent reduction antimony by addition and can move
Shifting property, has the characteristics that easy to operate, low in cost, the period is short compared with other technologies, is the effective of reparation antimony pollution soil
Means.The research and development of antimony pollution soil stabilization renovation agent are the key links of the technology.Currently, repairing the stabilization of antimony pollution soil
Agent is mainly made of the iron-based material of different proportion and oxidation, wherein iron-based material include ferrous sulfate, ferric sulfate, iron chloride,
Reduced iron powder, goethite, ferrihydrite etc., the stabilizing mechanism to antimony are that the iron that iron-based material generates under alkaline condition aoxidizes
Object, iron hydroxide have stronger adsorption capacity to antimony.However, soil remediation medicament is not during actual soil remediation
It only needs that there is good effect to target contaminant, repairs medicament itself and also answer environmental-friendly, not will cause secondary pollution.It is existing
Research shows that ferric sulfate, ferrous sulfate will lead to soil acidification in use, and reduced iron powder, goethite, ferrihydrite at
This is higher, can not engineer application.
In recent years, as a large amount of antimony pollution soil in the ground such as the promulgation of " ten, soil " and hunan stannary, Guangxi Hechi are badly in need of
It repairs, the research and development upsurge of antimony pollution soil stabilization renovation agent has been risen in Environmental Geotechnical field, but the correlation of application, authorization is special
Benefit is also less.Patent CN108059958A (publication number) discloses a kind of antimony pollution place soil stabilization renovation agent and its preparation
Method, formula are ferrous sulfate 20%~50%, reduced iron powder 5%~20%, bentonite 20%~50%, calcium oxide 10%
~30%, calcium carbonate 5%~20%；Preparation method is that above-mentioned raw materials are added in ball mill, and in inert gas shielding
Under conditions of grind 5~10min.The formula can guarantee the stabilization effect of antimony pollution soil, but calcium oxide therein and
Ferrous sulfate easily causes the salinization of soil or acidification of soil, and reduced iron powder activity is high, oxidizable in air, not easy to maintain.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, it is an object of the present invention to provide a kind of repairing effect is good
Good, simple and practical antimony pollution soil-repairing agent based on clay mineral doping and, it is a further object of the present invention to provide one kind
The preparation method of low in cost, significant effect, the environmental-friendly antimony pollution soil-repairing agent based on clay mineral doping.
Technical solution: a kind of antimony pollution soil-repairing agent based on clay mineral doping of the present invention, comprising following
The substance of parts by weight: 35~50 parts of chlorite, 10~25 parts of goethite, 25~40 parts of calcium hydroxide.
Preferably, the parts by weight of chlorite are 35~40 parts.The parts by weight of goethite are 15~25 parts.Calcium hydroxide
Parts by weight be 34~40 parts.Chlorite, goethite, calcium hydroxide partial size be respectively less than 0.15mm.
The preparation method of the above-mentioned antimony pollution soil-repairing agent based on clay mineral doping comprising the steps of:
A, chlorite, goethite, calcium hydroxide are air-dried to moisture content less than 10%, is ground up, sieved, partial size is less than 100
Mesh；
B, the chlorite, goethite, calcium hydroxide of above-mentioned parts by weight are added in powder mixing machine, are stirred until homogeneous
Degree is greater than 95%.
Wherein, the judgment method of the uniformity is that random acquisition stabilizes renovation agent, measures renovation agent with Handheld spectrometer
In main component content, when the coefficient of variation of measured value is less than 5%, that is, can determine that mixing evenness be greater than 95%.
Reaction principle: the iron oxidation that oxide, aluminium oxide and the goethite of the iron in chlorite are formed under alkaline condition
Object, iron hydroxide have stronger adsorption capacity to antimony, can guarantee the stabilization effect of antimony pollution soil；Chlorite is as one
The natural clay mineral of kind is capable of providing part molysite, reduces the cost of stabilizer, and goethite can as a kind of additive
The deficiency of iron content in chlorite is supplemented, the two is coordinated mutually, complements each other；Adding a small amount of calcium hydroxide makes to repair Polluted Soil
Earth is in weakly alkaline environment, is conducive to the formation of the oxide and hydroxide of iron.
The utility model has the advantages that compared to the prior art the present invention, has the characteristics that following conspicuousness:
1, chlorite is the main component of antimony pollution soil stabilization renovation agent and the main source of iron, is a kind of natural
Clay mineral, raw material is cheap and easy to get, advantageously reduces antimony pollution soil remediation cost, and environmental-friendly, not will cause secondary dirt
Dye；
2, goethite can supplement the deficiency of iron content in chlorite, provide additional iron for the stabilisation of antimony pollution soil
Source, meanwhile, as a kind of additive, volume is lower, is unlikely to greatly improve stabilizer cost.
Detailed description of the invention
Fig. 1 is antimony leaching concentration value test chart of the invention；
Fig. 2 is soil pH value test chart of the invention.
Specific embodiment
In following embodiment, the antimony pollution soil sources of use are in Guangxi Hechi Tailings Dam, wherein antimony content
2815mg/kg, the pH value of soil are 4.68.Chlorite, goethite, calcium hydroxide are technical grade product, moisture content difference
It is 7.52%, 3.44%, 5.89%, partial size is respectively less than 100 mesh.It is dry that antimony pollution soil stabilization renovation agent volume accounts for contaminated soil
Weight 4.0wt%.Chlorite, goethite, calcium hydroxide partial size be respectively less than 0.15mm.
Embodiment 1
35 parts of chlorite, 10 parts of goethites, 25 parts of calcium hydroxides are placed in powder mixing machine and are mixed 10 minutes, mixing is equal
Evenness is 98%.Then, it is added in powder mixing machine with antimony pollution soil and mixes, is compacted.Contaminated soil and stabilisation
The mix moisture content of reparation is 22%, compactness 96%.
Embodiment 2
50 parts of chlorite, 25 parts of goethites, 40 parts of calcium hydroxides are placed in powder mixing machine and are mixed 10 minutes, mixing is equal
Evenness is 95%.Then, it is added in powder mixing machine with antimony pollution soil and mixes, is compacted.Contaminated soil and stabilisation
The mix moisture content of reparation is 22%, compactness 97%.
Embodiment 3
36 parts of chlorite, 17 parts of goethites, 33 parts of calcium hydroxides are placed in powder mixing machine and are mixed 10 minutes, mixing is equal
Evenness is 95%.Then, it is added in powder mixing machine with antimony pollution soil and mixes, is compacted.Contaminated soil and stabilisation
The mix moisture content of reparation is 22%, compactness 98%.
Embodiment 4
40 parts of chlorite, 15 parts of goethites, 34 parts of calcium hydroxides are placed in powder mixing machine and are mixed 10 minutes, mixing is equal
Evenness is 96%.Then, it is added in powder mixing machine with antimony pollution soil and mixes, is compacted.Contaminated soil and stabilisation
The mix moisture content of reparation is 22%, compactness 96%.
Embodiment 5
38 parts of chlorite, 20 parts of goethites, 38 parts of calcium hydroxides are placed in powder mixing machine and are mixed 10 minutes, mixing is equal
Evenness is 97%.Then, it is added in powder mixing machine with antimony pollution soil and mixes, is compacted.Contaminated soil and stabilisation
The mix moisture content of reparation is 22%, compactness 97%.
Embodiment 6
45 parts of chlorite, 25 parts of goethite, 30 parts of calcium hydroxide are placed in powder mixing machine and are mixed 10 minutes, mixing is equal
Evenness is 96%, the antimony pollution soil stabilization renovation agent of system.Then, it is mixed with antimony pollution soil, compacting.Contaminated soil
It is 22% with the mix moisture content repaired is stabilized, compactness 96%.
Embodiment 7
50 parts of chlorite, 20 parts of goethite, 30 parts of calcium hydroxide are placed in powder mixing machine and are mixed 10 minutes, mixing is equal
Evenness is 96%, the antimony pollution soil stabilization renovation agent of system.Then, it is mixed with antimony pollution soil, compacting.Contaminated soil
It is 22% with the mix moisture content repaired is stabilized, compactness 96%.
Embodiment 8
40 parts of chlorite, 25 parts of goethite, 35 parts of calcium hydroxide are placed in powder mixing machine and are mixed 10 minutes, mixing is equal
Evenness is 96%, the antimony pollution soil stabilization renovation agent of system.Then, it is mixed with antimony pollution soil, compacting.Contaminated soil
It is 22% with the mix moisture content repaired is stabilized, compactness 96%.
Comparative example 1
Only antimony pollution soil in Example 6-8 does not add any stabilizer, mixes, compacting.Contaminated soil and stabilisation
The mix moisture content of reparation is 22%, compactness 96%.
Comparative example 2
40 parts of ferrous sulfate, 10 parts of reduced iron powder, 30 parts of bentonite, 10 parts of calcium oxide, 10 parts of calcium carbonate are placed in powder
It is mixed 10 minutes in mixing machine, mixture homogeneity 94%, antimony pollution soil stabilization in publication number CN108059958A is made
Renovation agent.Then, it is mixed with antimony pollution soil, compacting.Contaminated soil and the mix moisture content for stabilizing reparation are 22%,
Compactness is 96%.
By Examples 1 to 3, comparative example 1~2 implement after soil sample wrap sealing with self-sealing hermetic bag, 20 ± 2 DEG C,
Humidity conserves 28 days under the conditions of being greater than 95%, then does toxicity characteristic leaching procedure to contaminated soil, stabilisation contaminated soil.
Testing standard: People's Republic of China's environmental protection professional standard " solid waste Leaching leaching method sulfuric acid
Nitrate method " (HJ/T299-2007).
Test process: contaminated soil, stabilisation contaminated soil 50g after respectively weighing maintenance are dried under the conditions of 105 DEG C, are surveyed
Determine pedotheque moisture content.According to regulation in " solid waste Leaching leaching method sulfonitric method " (HJ/T299-2007)
Method and step measurement Polluted Soil, stabilize Polluted Soil Leaching.Test result is shown in Fig. 1, repairs target value and is
0.05mg/L.As shown in Figure 1: (1) antimony pollution soil is not added with any medicament in comparative example 1, and leaching concentration value is 0.53mg/
L is more than to repair target value 0.05mg/L, need to repair to it；(2) comparative example 2 is added in 4% publication number CN108059958A
Antimony pollution soil stabilization renovation agent, antimony leaching concentration is reduced to 0.17mg/L by 0.53mg/L, but not yet meets and repair target
Requirement；(3) embodiment 6-8 adds stabilizer of the invention, and the leaching concentration of fluorine is reduced to 0.022 by 0.53mg/L~
0.041mg/L better than antimony pollution soil stabilization renovation agent in publication number CN108059958A, and meets and repairs target call.
By embodiment 6~8, comparative example 1,2 leaching test the result shows that, antimony pollution soil stabilization renovation agent energy of the present invention
The Leaching for enough significantly reducing antimony, meets requirement of the recovery project to antimony leaching concentration.
Soil pH value measurement: distilled water, oscillation is added by solid-to-liquid ratio 1:1 in contaminated soil (dry weight) after taking 10g to repair
30min measures the pH value of filtrate with the membrane filtration of 0.45um.Test result is shown in Fig. 2.As shown in Figure 2, it adds of the invention
Antimony pollution soil stabilization renovation agent can be such that the pH value of soil increases, and be increased to 7.95~8.34 by 5.97, between 6~9,
Belong to environmentally friendly stabilizer；Antimony pollution soil stabilization renovation agent makes the pH of soil in addition publication number CN108059958A
Value reduces, and is reduced to 4.33 by 5.97, and a large amount of ferrous sulfate, which is added, leads to soil acidification, is unfavorable for the benefit again of soil after repairing
With.
In conclusion antimony pollution soil stabilization renovation agent of the invention is compared with the existing, can significantly reduce highly concentrated
The Leaching of antimony pollution soil is spent, raw material are cheap and easy to get, it is easy to prepare, and have the characteristics that environmental-friendly.
Claims (7)
1. a kind of antimony pollution soil-repairing agent based on clay mineral doping, it is characterised in that the object comprising following parts by weight
Matter: 35~50 parts of chlorite, 10~25 parts of goethite, 25~40 parts of calcium hydroxide.
2. a kind of antimony pollution soil-repairing agent based on clay mineral doping according to claim 1, it is characterised in that: institute
The parts by weight for stating chlorite are 35~40 parts.
3. a kind of antimony pollution soil-repairing agent based on clay mineral doping according to claim 1, it is characterised in that: institute
The parts by weight for stating goethite are 15~25 parts.
4. a kind of antimony pollution soil-repairing agent based on clay mineral doping according to claim 1, it is characterised in that: institute
The parts by weight for stating calcium hydroxide are 34~40 parts.
5. a kind of antimony pollution soil-repairing agent based on clay mineral doping according to claim 1, it is characterised in that: institute
State chlorite, goethite, calcium hydroxide partial size be respectively less than 0.15mm.
6. a kind of preparation method of the antimony pollution soil-repairing agent based on clay mineral doping, it is characterised in that include following step
It is rapid:
(a) chlorite, goethite, calcium hydroxide are air-dried to moisture content less than 10%, is ground up, sieved, partial size is less than 100 mesh；
(b) chlorite, goethite, calcium hydroxide of above-mentioned parts by weight are added in powder mixing machine, degree of being stirred until homogeneous
Greater than 95%.
7. a kind of preparation method of antimony pollution soil-repairing agent based on clay mineral doping according to claim 6,
Be characterized in that: the judgment method of the uniformity is that random acquisition stabilizes renovation agent, measures renovation agent with Handheld spectrometer
In main component content, when the coefficient of variation of measured value is less than 5%, that is, can determine that mixing evenness be greater than 95%.
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Cited By (1)
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| CN112479608A (en) * | 2020-11-23 | 2021-03-12 | 中冶南方都市环保工程技术股份有限公司 | Curing and stabilizing agent for antimony tailings in mining area and application thereof |
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