CN105199738A - Solidifying agent for heavy metal contaminated soil and using method thereof - Google Patents
Solidifying agent for heavy metal contaminated soil and using method thereof Download PDFInfo
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- CN105199738A CN105199738A CN201510609147.5A CN201510609147A CN105199738A CN 105199738 A CN105199738 A CN 105199738A CN 201510609147 A CN201510609147 A CN 201510609147A CN 105199738 A CN105199738 A CN 105199738A
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Abstract
The invention relates to the technical field of heavy metal pollution treatment, in particular to a solidifying agent for heavy metal contaminated soil and a using method thereof. According to the technical scheme for solving the technical problems, the solidifying agent for the heavy metal contaminated soil consists of a solidifying agent L and a solidifying agent S, wherein the solidifying agent L is ferric zinc polysilicate, the solidifying agent S is prepared from, by mass, 10-30% of cement, 10-20% of calcium dihydrogen phosphate, 20-60% of kaolin and 10-40% of diatomaceous earth. The solidifying agent for the heavy metal contaminated soil has remarkable solidifying effect on multiple heavy metals, such as lead, copper, zinc and cadmium, can effectively reduce the leaching concentration of the solidified heavy metal contaminated soil and is simple and convenient to operate, free of secondary pollution and low in anti-solvent risk.
Description
Technical field
The present invention relates to and administer heavy metal contamination technical field, especially a kind of solidifying agent of heavy-metal contaminated soil and using method thereof.
Background technology
Heavy metal pollution of soil refers to due to mankind's activity, and the content of the trace heavy metal element in soil in soil exceedes background value, and the phenomenon causing eco-environmental quality to worsen.In general, as long as edatope is subject to the infringement of external objectionable impurities or energy, just show that this soil is polluted.According to the degree of being encroached on, be divided into multiple categories such as light contamination, slight pollution, intermediate pollution, severe contamination and foul pollution.Different from water pollution, topsoil, heavy metal in soil pollutes and has the features such as disguise, hysteresis quality, chronicity and non-reversibility.And the heavy metal of indication refers to the significant element of bio-toxicity in Soil Environmental Pollution
Heavy metal pollution problem is global problem of environmental pollution, and in recent years, world's heavy metal pollution of soil problem shows especially day by day, especially in developing country, constitutes a serious threat to ecotope, food safety and HUMAN HEALTH.In April, 2014, China has issued national Soil Pollution Investigation publication first.Investigation result shows, and national edatope situation totally allows of no optimist, and some areas soil pollution is heavier, and arable soil environmental quality causes anxiety, industry and mining discarded ground edatope outstanding problem.And from pollution type, based on inorganic type, organic type takes second place, compound pollution proportion is less, and 8 kinds of inorganic pollutants such as cadmium, mercury, arsenic, copper, lead, chromium, zinc, nickel figure place that exceeds standard accounts for 82.8% of all super punctuation bits.
The current recovery technique for heavy-metal contaminated soil mainly contains changes (visitor) local method, chemical leaching method, phytoremediation etc., but the shortcomings such as above recovery technique has, and cost is high, the cycle long, restriction is many, therefore curing/stabilizing method is a kind of comparatively conventional recovery technique.Curing/stabilizing method refers to reacts generate more stable material by adding curing/stabilizing medicament and heavy metal in soil, thus the transport property of reduction heavy metal.
Summary of the invention
In order to overcome the deficiency of existing heavy metal contamination, the invention provides a kind of solidifying agent and using method thereof of heavy-metal contaminated soil.
The technical solution adopted for the present invention to solve the technical problems is: a kind of solidifying agent of heavy-metal contaminated soil, and the solidifying agent of described heavy-metal contaminated soil is made up of solidifying agent L and solidifying agent S;
Described solidifying agent L is polysilicic iron-zinc;
In described solidifying agent S, the mass percent of each component is:
Cement 10-30%, monocalcium phosphate 10-20%, kaolin 20-60%, diatomite 10-40%.
According to another embodiment of the invention, comprise further, in described solidifying agent S, diatomite is that fineness is more than 200 object diatomite.
According to another embodiment of the invention, comprise further, in described solidifying agent S, diatomite is that retort furnace calcining manufactures.
A using method for heavy-metal contaminated soil solidifying agent, the method comprises the following steps:
A, by cement 10-30%, monocalcium phosphate 10-20%, the mass percent mix and blend of kaolin 20-60% and diatomite 10-40% prepares solidifying agent S.
B, be between 1:100-5:100 by the mass ratio of described solidifying agent S and heavy-metal contaminated soil, solidifying agent S mixed with heavy-metal contaminated soil, stirs, obtains compound.
C, get described heavy-metal contaminated soil 35-45%(mass ratio) water, mix with the mass ratio of solidifying agent S be 0.1-0.4:1 solidifying agent L after, join in described compound, stir, leave standstill shaping.
According to another embodiment of the invention, comprise further, the churning time in described step b is 3-5min; Churning time in described step c is 5-10min, and time of repose is 24-48h.
The invention has the beneficial effects as follows, this heavy-metal contaminated soil solidifying agent is remarkable to the solidification effect of the various heavy such as lead, copper, zinc, cadmium, effectively can reduce the leaching concentration of the rear heavy-metal contaminated soil of solidification, and easy and simple to handle, non-secondary pollution, anti-molten risk is low.
The principle of heavy-metal contaminated soil solidifying agent of the present invention is: monocalcium phosphate can with heavy metal in soil generation chemical reaction, generate phosphate mineral that is stable, indissoluble, under the diatomite effect with the feature such as porousness, bigger serface, utilize the feature of polysilicic iron-zinc high flocculence in solidifying agent L, the charge neutrality stronger by it and adsorption bridging effect, heavy metal in soil is fixed firmly, there is hydration reaction in cement, whole solidification is served to the effect of binding agent in solidifying agent S.And kaolin is a kind of clay mineral, not only can adsorb various ion, and there is stronger acid resistance, greatly can reduce the anti-molten risk after heavy metals immobilization.
Embodiment
A solidifying agent for heavy-metal contaminated soil, the solidifying agent of described heavy-metal contaminated soil is made up of solidifying agent L and solidifying agent S;
Described solidifying agent L is polysilicic iron-zinc;
In described solidifying agent S, the mass percent of each component is:
Cement 10-30%, monocalcium phosphate 10-20%, kaolin 20-60%, diatomite 10-40%.
According to another embodiment of the invention, comprise further, in described solidifying agent S, diatomite is that fineness is more than 200 object diatomite.
According to another embodiment of the invention, comprise further, in described solidifying agent S, diatomite is that retort furnace calcining manufactures.
A using method for heavy-metal contaminated soil solidifying agent, the method comprises the following steps:
A, by cement 10-30%, monocalcium phosphate 10-20%, the mass percent mix and blend of kaolin 20-60% and diatomite 10-40% prepares solidifying agent S.
B, be between 1:100-5:100 by the mass ratio of described solidifying agent S and heavy-metal contaminated soil, solidifying agent S mixed with heavy-metal contaminated soil, stirs, obtains compound.
C, get described heavy-metal contaminated soil 35-45%(mass ratio) water, mix with the mass ratio of solidifying agent S be 0.1-0.4:1 solidifying agent L after, join in described compound, stir, leave standstill shaping.
According to another embodiment of the invention, comprise further, the churning time in described step b is 3-5min; Churning time in described step c is 5-10min, and time of repose is 24-48h.
Embodiments of the invention 1
(1) get: the cement of 20%, the monocalcium phosphate of 15%, the kaolin of 50%, the diatomite of 15%, mix the solidifying agent S made in the present invention;
(2) take lead, copper polluted soil 100g, add the solidifying agent S that 1g is above-mentioned, stir, form compound;
(3) get 40g water, mix 0.2g solidifying agent L, add in above-mentioned compound and fully stir 5min, leave standstill 48h;
After (4) 2 days, natural air drying soil, broken sampling, measures Leaching of Heavy Metals situation according to " solid waste Leaching leaching method sulfonitric method " (HJ/T299-2007).
Before and after embodiment 1 is administered, heavy metal in soil leaching concentration (mg/L) is in table 1:
Table 1 embodiment 1 administers front and back Leaching of Heavy Metals concentration (mg/L);
Embodiments of the invention 2;
(1) get: the cement of 25%, the monocalcium phosphate of 20%, the kaolin of 30%, the diatomite of 25%, mix the solidifying agent S made in the present invention;
(2) take lead, copper, zinc, cadmium pollution soil 100g, add the solidifying agent S that 3g is above-mentioned, stir, form compound;
(3) get 40g water, mix 0.4g solidifying agent L, add in above-mentioned compound and fully stir 5min, leave standstill 48h;
After (4) 2 days, natural air drying soil, broken sampling, measures Leaching of Heavy Metals situation according to " solid waste Leaching leaching method sulfonitric method " (HJ/T299-2007).
Before and after embodiment 2 is administered, heavy metal in soil leaching concentration (mg/L) is in table 2:
Table 2 embodiment 2 administers front and back Leaching of Heavy Metals concentration (mg/L);
Embodiments of the invention 3;
(1) get: the cement of 10%, the monocalcium phosphate of 10%, the kaolin of 50%, the diatomite of 30%, mix the solidifying agent S made in the present invention;
(2) take lead, copper, zinc, cadmium pollution soil 100g, add the solidifying agent S that 1g is above-mentioned, stir, form compound;
(3) get 35g water, mix 0.1g solidifying agent L, add in above-mentioned compound and fully stir 5min, leave standstill 2 days;
After (4) 1 days, natural air drying soil, broken sampling, measures Leaching of Heavy Metals situation according to " solid waste Leaching leaching method sulfonitric method " (HJ/T299-2007).
Before and after embodiment 3 is administered, heavy metal in soil leaching concentration (mg/L) is in table 3:
Table 3 embodiment 3 administers front and back Leaching of Heavy Metals concentration (mg/L);
Embodiments of the invention 4;
(1) get: the cement of 30%, the monocalcium phosphate of 20%, the kaolin of 20%, the diatomite of 30%, mix the solidifying agent S made in the present invention;
(2) take lead, copper, zinc, cadmium pollution soil 100g, add the solidifying agent S that 5g is above-mentioned, stir, form compound;
(3) get 45g water, mix 2g solidifying agent L, add in above-mentioned compound and fully stir 5min, leave standstill 2 days;
After (4) 2 days, natural air drying soil, broken sampling, measures Leaching of Heavy Metals situation according to " solid waste Leaching leaching method sulfonitric method " (HJ/T299-2007).
Before and after embodiment 4 is administered, heavy metal in soil leaching concentration (mg/L) is in table 4:
Table 4 embodiment 4 administers front and back Leaching of Heavy Metals concentration (mg/L);
Claims (5)
1. a solidifying agent for heavy-metal contaminated soil, is characterized in that, the solidifying agent of described heavy-metal contaminated soil is made up of solidifying agent L and solidifying agent S;
Described solidifying agent L is polysilicic iron-zinc;
In described solidifying agent S, the mass percent of each component is:
Cement 10-30%, monocalcium phosphate 10-20%, kaolin 20-60%, diatomite 10-40%.
2. the solidifying agent of heavy-metal contaminated soil according to claim 1, is characterized in that, in described solidifying agent S, diatomite is that fineness is more than 200 object diatomite.
3. the solidifying agent of heavy-metal contaminated soil according to claim 1, is characterized in that, in described solidifying agent S, diatomite is that retort furnace calcining manufactures.
4. use a using method for heavy-metal contaminated soil solidifying agent described in claim 1, it is characterized in that, the method comprises the following steps:
A, by cement 10-30%, monocalcium phosphate 10-20%, the mass percent mix and blend of kaolin 20-60% and diatomite 10-40% prepares solidifying agent S.
B, be between 1:100-5:100 by the mass ratio of described solidifying agent S and heavy-metal contaminated soil, solidifying agent S mixed with heavy-metal contaminated soil, stirs, obtains compound.
C, get described heavy-metal contaminated soil 35-45%(mass ratio) water, mix with the mass ratio of solidifying agent S be 0.1-0.4:1 solidifying agent L after, join in described compound, stir, leave standstill shaping.
5. the using method of a kind of heavy-metal contaminated soil solidifying agent according to claim 4, is characterized in that, the churning time in described step b is 3-5min; Churning time in described step c is 5-10min, and time of repose is 24-48h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510609147.5A CN105199738A (en) | 2015-09-23 | 2015-09-23 | Solidifying agent for heavy metal contaminated soil and using method thereof |
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| CN201510609147.5A CN105199738A (en) | 2015-09-23 | 2015-09-23 | Solidifying agent for heavy metal contaminated soil and using method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598155A (en) * | 2015-12-31 | 2016-05-25 | 陕西清扬环境科技有限公司 | Remediation method for soil polluted by arsenic |
| CN105801045A (en) * | 2016-02-04 | 2016-07-27 | 周益辉 | Cadmium slag curing agent as well as preparation method and application thereof |
| CN105801046A (en) * | 2016-02-04 | 2016-07-27 | 周益辉 | Cadmium-containing waste residue curing agent as well as preparation method and application thereof |
| CN106398705A (en) * | 2016-08-19 | 2017-02-15 | 常州大学 | Solidifying agent for stabilizing heavy metal Zn in soil and using method thereof |
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| CN101407352A (en) * | 2008-11-07 | 2009-04-15 | 哈尔滨工业大学 | Polysilicic iron-zinc coagulant and preparation thereof |
| CN102766465A (en) * | 2012-07-31 | 2012-11-07 | 湖南永清环境修复有限公司 | Ion mineralization stabilizer for treating soil with heavy metal pollution and application method thereof |
| CN103936118A (en) * | 2014-04-02 | 2014-07-23 | 南京信息工程大学 | Flocculant for purifying landscape water and preparation method of flocculant |
| CN104059673A (en) * | 2014-06-25 | 2014-09-24 | 湖南新九方科技有限公司 | Combined stable mineralization restoration agent for treating heavy-metal polluted soil and application method thereof |
-
2015
- 2015-09-23 CN CN201510609147.5A patent/CN105199738A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101407352A (en) * | 2008-11-07 | 2009-04-15 | 哈尔滨工业大学 | Polysilicic iron-zinc coagulant and preparation thereof |
| CN102766465A (en) * | 2012-07-31 | 2012-11-07 | 湖南永清环境修复有限公司 | Ion mineralization stabilizer for treating soil with heavy metal pollution and application method thereof |
| CN103936118A (en) * | 2014-04-02 | 2014-07-23 | 南京信息工程大学 | Flocculant for purifying landscape water and preparation method of flocculant |
| CN104059673A (en) * | 2014-06-25 | 2014-09-24 | 湖南新九方科技有限公司 | Combined stable mineralization restoration agent for treating heavy-metal polluted soil and application method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598155A (en) * | 2015-12-31 | 2016-05-25 | 陕西清扬环境科技有限公司 | Remediation method for soil polluted by arsenic |
| CN105801045A (en) * | 2016-02-04 | 2016-07-27 | 周益辉 | Cadmium slag curing agent as well as preparation method and application thereof |
| CN105801046A (en) * | 2016-02-04 | 2016-07-27 | 周益辉 | Cadmium-containing waste residue curing agent as well as preparation method and application thereof |
| CN106398705A (en) * | 2016-08-19 | 2017-02-15 | 常州大学 | Solidifying agent for stabilizing heavy metal Zn in soil and using method thereof |
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