CN105505399A - Heavy-metal solidifying agent and heavy metal contaminated soil solidifying method - Google Patents
Heavy-metal solidifying agent and heavy metal contaminated soil solidifying method Download PDFInfo
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- CN105505399A CN105505399A CN201510907779.XA CN201510907779A CN105505399A CN 105505399 A CN105505399 A CN 105505399A CN 201510907779 A CN201510907779 A CN 201510907779A CN 105505399 A CN105505399 A CN 105505399A
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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
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- 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 relates to a heavy-metal solidifying agent and a heavy metal contaminated soil solidifying method. The method is characterized by comprising the steps of mixing materials such as lime mortar, a powder grinding aid, water glass, a framework material, an activator and adjuvants so as to prepare the heavy-metal solidifying agent, adding the heavy-metal solidifying agent into contaminated soil, carrying out uniform stirring, and carrying out solidifying and stabilizing for 3-5 days under the condition of normal temperature (25+/-5 DEG C). The heavy-metal solidifying agent contains the ingredients in parts by weight: 1-5 parts of lime mortar, 2-3 parts of powder grinding aid, 10-20 parts of water glass, 6-10 parts of framework material, 1-2 parts of activator, 1-2 parts of adjuvants and 5-15 parts of pulverized coal ash, wherein the mass ratio of the solidifying agent to the contaminated soil is (1 to 3): (10 to 100). According to the heavy-metal solidifying agent and the heavy metal contaminated soil solidifying method, industrial and agricultural wastes such as the lime mortar and the framework material serve as solidifying agent materials for multi-heavy-metal contaminated soil and are wide in source, the operating method is simple, the effect of solidifying heavy metals in the soil is good, and a certain scientific basis can be provided for multi-heavy-metal pollution abatement of contaminated areas.
Description
Technical field
The present invention relates to a heavy metal species fixing agent and heavy-metal contaminated soil curing, belong to soil stabilization field in environmental engineering.
Background technology
The mining industry of China is flourishing, cemented tailings backfill storage is large, being vulnerable to the climate change effects such as rainfall causes the Serious Accidents such as dam break to occur, middle and lower reaches place farmland soil heavy metals is caused to pollute, lose agricultural production function, and pollute heavy metal in soil mainly to organically combine state, occurrence patterns that residual form isoreactivity is lower, filter out fast and effectively can repair high density and active be development trend from now on compared with the task of the solidify material of low heavy metal contaminated soil.
The disposal of heavy-metal contaminated soil is a costly and difficult task, and in-situ passivation reparation is a kind of Treatment process of economical and efficient.In heavy-metal contaminated soil in-situ passivation is repaired, for improving the repairing effect of heavy-metal contaminated soil, often add some solidify material, use range comparatively widely soil-solidified-agent main source comprises the material such as organic, mineral-type.
In prior art, the method that the restorative procedure that the most of patent be the theme with heavy-metal contaminated soil reparation is mainly probed into is Phytoremediation of Soils Contaminated by Heavy Metals, but there is problems such as yielding poorly, repairing efficiency is longer.And it is less about Heavy Metals in Soil Contaminated curing at present.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a heavy metal species fixing agent and heavy-metal contaminated soil curing, repairing effect is good, for the reparation of big area engineering provides technical support from now on.
According to technical scheme provided by the invention, described heavy metal fixing agent, it is characterized in that, comprise following component, component ratio by mass number meter: 1-5 weight part lime white, 2-3 weight part powder grinding aid, 10-20 weight parts water glass, 6-10 weight part framework material, 1-2 weight part activator, 1-2 weight part auxiliary and 5-15 weight parts of fine coal ash.
In an embodiment, described powder grinding aid is one or more in trolamine, coarse whiting grinding aid, molasses powder, calcium chloride, magnesium chloride, iron(ic) chloride.
In an embodiment, described framework material is that stalk is or/and flyash.
In an embodiment, described activator is one or more in pyrrhosiderite (iron rust), magnesium oxide, sodium pyrosulfate.
In an embodiment, described auxiliary is one or more in phosphoric acid salt, sodium lignosulfonate, calcium lignin sulphonate.
Described heavy-metal contaminated soil curing, is characterized in that, comprise the following steps:
(1) 1-5 weight part lime white, 2-3 weight part powder grinding aid, 10-20 weight parts water glass, 6-10 weight part framework material, 1-2 weight part activator, 1-2 weight part auxiliary are mixed with 5-15 weight parts of fine coal ash, make heavy metal fixing agent;
(2) join in Polluted Soil by heavy metal fixing agent, the mass ratio of heavy metal fixing agent and Polluted Soil is 1-3:10-100, stirs, and stablizes 3 ~ 5 days 25 ± 5 DEG C of solidifications.
Described Polluted Soil is containing Pb >=500mg/kg, Cd >=1mg/kg, As >=250mg/kg.
In an embodiment, the mass ratio of described heavy metal fixing agent and Polluted Soil is 1:10-100.
The invention has the advantages that: have stronger applicability for various contaminated soil, solidification effect is good and persistence is strong.Using in curing agent component process, not only can improve curing performance, and can control and reduce the cost of solidify material, the disposal such as later stage soil-burial can be widely used in.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1: one heavy metal species fixing agent, comprise following component, component ratio by mass number meter: 1 weight part lime white, 1 weight part trolamine, 1 weight part coarse whiting grinding aid, 10 weight parts water glass, 6 weight part stalks, 1 weight part pyrrhosiderite, 1 parts by weight of phosphoric acid salt and 5 weight parts of fine coal ash; Above-mentioned materials is mixed and obtains heavy metal fixing agent.
Embodiment 2: one heavy metal species fixing agent, comprise following component, component ratio by mass number meter: 5 weight part lime whites, 1 weight part iron(ic) chloride, 1 weight part magnesium chloride, 1 weight part calcium chloride, 20 weight parts water glass, 10 weight part stalks, 1 parts sulfuric acid hydrogen sodium, 1 weight part magnesium oxide, 1 weight part calcium lignin sulphonate, 1 weight part sodium lignosulfonate and 15 weight parts of fine coal ash; Above-mentioned materials is mixed and obtains heavy metal fixing agent.
Embodiment 3: one heavy metal species fixing agent, comprise following component, component ratio by mass number meter: 4 weight part lime whites, 1 weight part grain honey powder, 1.5 weight part calcium chloride, 18 weight parts water glass, 8 weight part stalks, 1 parts sulfuric acid hydrogen sodium, 0.5 weight part magnesium oxide, 1.5 weight part sodium lignosulfonates and 12 weight parts of fine coal ash; Above-mentioned materials is mixed and obtains heavy metal fixing agent.
Embodiment 4: a kind of heavy-metal contaminated soil curing, comprises the following steps:
Heavy-metal contaminated soil is after testing containing Pb512mg/kg, Cd1.2mg/kg, As270mg/kg.Heavy metal fixing agent embodiment 1 obtained joins in Polluted Soil, and the mass ratio of heavy metal fixing agent and Polluted Soil is 3:100, stirs, and stablizes 3 ~ 5 days 25 ± 5 DEG C of solidifications.After testing, in solidification contaminated soil leach liquor Pb, Cd, As content be respectively 0.07mg/L, do not detect, 0.277mg/L, lower than " Hazardous wastes judging standard-leaching characteristic identification " (GB5085.3-2007) limit value.
Embodiment 5: a kind of heavy-metal contaminated soil curing, comprises the following steps:
Heavy-metal contaminated soil is after testing containing Pb531mg/kg, Cd1.1mg/kg, As260mg/kg.Heavy metal fixing agent embodiment 2 obtained joins in Polluted Soil, and the mass ratio of heavy metal fixing agent and Polluted Soil is 2:100, stirs, 25 ± 5 DEG C, relative humidity be 60 ~ 80% solidification stablize 3 ~ 5 days.After testing, in solidification contaminated soil leach liquor Pb, Cd, As content be respectively 0.12mg/L, do not detect, 0.547mg/L, lower than " Hazardous wastes judging standard-leaching characteristic identification " (GB5085.3-2007) limit value.
Embodiment 6: a kind of heavy-metal contaminated soil curing, comprises the following steps:
Heavy-metal contaminated soil is after testing containing Pb536mg/kg, Cd1.15mg/kg, As283mg/kg.Heavy metal fixing agent embodiment 3 obtained joins in Polluted Soil, and the mass ratio of heavy metal fixing agent and Polluted Soil is 3:100, stirs, 25 ± 5 DEG C, relative humidity be 60 ~ 80% solidification stablize 3 ~ 5 days.After testing, in solidification contaminated soil leach liquor Pb, Cd, As content be respectively 0.08mg/L, do not detect, 0032mg/L, lower than " Hazardous wastes judging standard-leaching characteristic identification " (GB5085.3-2007) limit value.
The concrete recovery technique of the soil of different pollution type is completely different, will repair contaminated soil according to contamination characteristics.Those of ordinary skill in the art will be appreciated that; above embodiment is only used to the present invention is described; and not as limitation of the invention, as long as in essential scope of the present invention, all will drop in protection scope of the present invention the change of the above embodiment, modification.
Claims (8)
1. a heavy metal species fixing agent, it is characterized in that, comprise following component, component ratio by mass number meter: 1-5 weight part lime white, 2-3 weight part powder grinding aid, 10-20 weight parts water glass, 6-10 weight part framework material, 1-2 weight part activator, 1-2 weight part auxiliary and 5-15 weight parts of fine coal ash.
2. heavy metal fixing agent as claimed in claim 1, is characterized in that: described powder grinding aid is one or more in trolamine, coarse whiting grinding aid, molasses powder, calcium chloride, magnesium chloride, iron(ic) chloride.
3. heavy metal fixing agent as claimed in claim 1, is characterized in that: described framework material is that stalk is or/and flyash.
4. heavy metal fixing agent as claimed in claim 1, is characterized in that: described activator is one or more in pyrrhosiderite, magnesium oxide, sodium pyrosulfate.
5. heavy metal fixing agent as claimed in claim 1, is characterized in that: described auxiliary is one or more in phosphoric acid salt, sodium lignosulfonate, calcium lignin sulphonate.
6. a heavy-metal contaminated soil curing, is characterized in that, comprises the following steps:
(1) 1-5 weight part lime white, 2-3 weight part powder grinding aid, 10-20 weight parts water glass, 6-10 weight part framework material, 1-2 weight part activator, 1-2 weight part auxiliary are mixed with 5-15 weight parts of fine coal ash, make heavy metal fixing agent;
(2) join in Polluted Soil by heavy metal fixing agent, the mass ratio of heavy metal fixing agent and Polluted Soil is 1-3:10-100, stirs, and stablizes 3 ~ 5 days 25 ± 5 DEG C of solidifications.
7. heavy-metal contaminated soil curing as claimed in claim 6, is characterized in that: described Polluted Soil is containing Pb >=500mg/kg, Cd >=1mg/kg, As >=250mg/kg.
8. heavy-metal contaminated soil curing as claimed in claim 6, is characterized in that: the mass ratio of described heavy metal fixing agent and Polluted Soil is 1:10-100.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106350079A (en) * | 2016-08-26 | 2017-01-25 | 夏百庆 | Soil heavy metal pollution curing agent |
| CN106978191A (en) * | 2017-06-05 | 2017-07-25 | 西施生态科技股份有限公司 | It is a kind of to be used to repair lead in acid soil, cadmium, the compound stabilizer of arsenic pollution |
| CN107399889A (en) * | 2017-07-25 | 2017-11-28 | 云南大地绿坤环保科技有限公司 | A kind of preparation of heavy metal sewage sludge stabilizer and application process |
| CN108160690A (en) * | 2017-11-27 | 2018-06-15 | 浙江师范大学 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN108672482A (en) * | 2018-04-20 | 2018-10-19 | 南安市创培电子科技有限公司 | One heavy metal species fixative and heavy-metal contaminated soil curing |
| CN112279565A (en) * | 2020-09-16 | 2021-01-29 | 中冶南方都市环保工程技术股份有限公司 | Method for preparing mine filling material by using solid waste cemented heavy metal tailings in steel industry |
| CN113831921A (en) * | 2021-10-20 | 2021-12-24 | 福建省环境保护设计院有限公司 | Soil remediation agent for fixing heavy metal elements in contaminated soil and preparation and application thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106350079A (en) * | 2016-08-26 | 2017-01-25 | 夏百庆 | Soil heavy metal pollution curing agent |
| CN106978191A (en) * | 2017-06-05 | 2017-07-25 | 西施生态科技股份有限公司 | It is a kind of to be used to repair lead in acid soil, cadmium, the compound stabilizer of arsenic pollution |
| CN107399889A (en) * | 2017-07-25 | 2017-11-28 | 云南大地绿坤环保科技有限公司 | A kind of preparation of heavy metal sewage sludge stabilizer and application process |
| CN108160690A (en) * | 2017-11-27 | 2018-06-15 | 浙江师范大学 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN108672482A (en) * | 2018-04-20 | 2018-10-19 | 南安市创培电子科技有限公司 | One heavy metal species fixative and heavy-metal contaminated soil curing |
| CN112279565A (en) * | 2020-09-16 | 2021-01-29 | 中冶南方都市环保工程技术股份有限公司 | Method for preparing mine filling material by using solid waste cemented heavy metal tailings in steel industry |
| CN113831921A (en) * | 2021-10-20 | 2021-12-24 | 福建省环境保护设计院有限公司 | Soil remediation agent for fixing heavy metal elements in contaminated soil and preparation and application thereof |
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Application publication date: 20160420 |