CN105602568B - A kind of heavy metal pollution place slip casting renovation agent and preparation method thereof - Google Patents
A kind of heavy metal pollution place slip casting renovation agent and preparation method thereof Download PDFInfo
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- CN105602568B CN105602568B CN201510966207.9A CN201510966207A CN105602568B CN 105602568 B CN105602568 B CN 105602568B CN 201510966207 A CN201510966207 A CN 201510966207A CN 105602568 B CN105602568 B CN 105602568B
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- 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
- 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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Abstract
The present invention relates to contaminated site recovery technique and environmental protection technologies more particularly to a kind of heavy metal pollution place slip casting renovation agent and preparation method thereof.Slip casting renovation agent in heavy metal pollution place is made of powder premix and live mixed liquid.Powder premix and live mixed liquid mass ratio are in 3:7 ~ 4:6.The quality percentage composition of powder premix are as follows: biomass active powdered carbon 15 ~ 40%, modified meerschaum powder 10 ~ 40%, bentonite in powder 10 ~ 45%, powdered rice hulls 10 ~ 25%；Live mixed liquid is the ammonium bicarbonate aqueous solution that mass concentration is 10 ~ 20%.The preparation method of heavy metal pollution place slip casting renovation agent: biomass active powdered carbon, powdered rice hulls, modified meerschaum powder, bentonite in powder are mixed in proportion into obtain powder premix, when application, it is mixed evenly with live mixed liquid as heavy metal pollution place slip casting renovation agent.The heavy metal pollution place slip casting renovation agent manufacturing cost is cheap, easy for construction.
Description
Technical field
The present invention relates to contaminated site recovery technique and environmental protection technical field more particularly to a kind of heavy metal pollution fields
Ground slip casting renovation agent and preparation method thereof.
Background technique
With the quickening of economic development and Development of China's Urbanization, the change of place property is increasingly frequent, some industrial lands by
In old town expansion and be changed into residential block, some industrial lands become the industry of different purposes because of enterprises remove, dealing etc.
Land used, in order to avoid environmental risk possible because of contaminated sites, these soils are necessary when circulating or changing purposes
Place assessment and pollution amelioration are carried out, and heavy metal pollution place is endangered greatly because its is seriously polluted, storage is more and has attracted much attention.
Slip casting method is also known as High-Pressure Grouting Method, is underground anti-seepage, one of the common construction method that soil layer is reinforced, at present Yin Qishi
Work is convenient, and repairing effect is good, the low feature of construction cost and the repair process for being applied to contaminated site.The slip casting of contaminated site
Repairing method is by the renovation agent of slurry shape, and under high pressure, the soil layer through pipeline injection contaminated site, heavy metal is repaired with slurry
The immobilization of heavy metal, stabilisation, innoxious is realized in multiple agent reaction.
The common restorative procedure in heavy metal pollution place has phytoremediation, microbial remediation method, soil improvement by importing soil from other places and chemistry to repair
Multiple method, although phytoremediation and microbial remediation method rehabilitation expense are lower, its repairing efficiency is long, and effect is not sufficiently stable,
It is greatly restricted in actual application.Soil improvement by importing soil from other places is the replacement using unpolluted soil by heavy-metal contaminated soil
Method, to realize the recovery of land function, but its processing cost is expensive, and deposits in heavy-metal contaminated soil transport process
In biggish ecological risk.Chemical restoration is that a kind of relative low price, one kind of repairing effect efficient stable are heavy metal-polluted
Site remediation method is contaminated, at present using relatively broad in heavy metal pollution site remediation.
Activated carbon from activated sludge has porous, high-specific surface area, a large amount of surface negative charge and height because its is low in cost
The characteristic of charge density has absorption fixed function well to heavy metal ion.Sepiolite and bentonit is cheap and easy to get, to a huge sum of money
Belonging to ion has extensive fixed effect.
Heavy metal pollution site remediation agent at present there are the problem of mainly have: 1) current heavy metal pollution site remediation agent
Contain the hydraulicity or high rigidity substance mostly, easily causes pipeline and equipment scaling, blocking when slip casting is repaired, increasing is constructed into
This；2) by phosphate radical, carbonate and heavy metal ion precipitating and co-precipitation occur for current heavy metal pollution site remediation agent
The fixation for realizing heavy metal ion, when the pH in the soil of place is varied widely, heavy metal ion is easy from fixed system
It is middle to return molten phenomenon, place is polluted again.3) heavy metal renovation agent in part is with trade wastes such as steel slag, power plant's slags
It is raw material to reduce cost, these substances itself contain a certain amount of heavy metal, are possible to reverse osmosis occur under certain conditions
Phenomenon aggravates the heavy metal pollution in place.
Summary of the invention
The object of the invention is that providing a kind of heavy metal pollution place slip casting renovation agent to solve the above-mentioned problems
And preparation method thereof.
The present invention through the following technical solutions to achieve the above objectives:
A kind of heavy metal pollution place slip casting renovation agent is made of powder premix and live mixed liquid, by quality percentage
Than meter, powder premix and live mixed liquid mass ratio are 3:7 ~ 4:6；Wherein, the quality percentage composition of powder premix are as follows: raw
Species activity powdered carbon 15 ~ 40%, modified meerschaum powder 10 ~ 40%, bentonite in powder 10 ~ 45%, powdered rice hulls 10 ~ 25%；Live mixed liquid
For ammonium bicarbonate aqueous solution, the mass percent concentration of ammonium hydrogen carbonate is 10 ~ 20%.Further, the activated carbon from activated sludge
Powder is prepared by following methods: firstly, collecting city domestic sewage handles plant excess sludge, after dehydrating and removing impurities, keeping moisture content
80 ~ 85%, it is protection gas with nitrogen, obtains activated carbon from activated sludge through 700 ~ 820 DEG C of 20 ~ 30min of charing in retort,
After crushed, 50 meshes are crossed and obtains activated carbon from activated sludge powder.Further, the modified meerschaum powder is hydrochloric Acid Modification sea
Afrodite powder, is prepared by following methods: (main chemical compositions by mass percentage: SiO with sepiolite raw ore252 ~ 55%,
CaO, MgO 23 ~ 35%, Al2O3、Fe2O3, FeO 4 ~ 8%) be raw material, sieve with 100 mesh sieve after ball milling, it is dense to be soaked in mass percent
Degree is 50min in 5 ~ 8% dilute hydrochloric acid, obtains hydrochloric Acid Modification sepiolite after natural drying, after crushed, sieves with 100 mesh sieve to obtain the final product
To modified meerschaum powder.Further, the bentonite in powder is to sieve with 100 mesh sieve resulting bentonite in powder, primary chemical at
Divide by mass percentage: SiO265 ~ 68%, Al2O3、Fe2O312 ~ 17%, CaO, MgO, K2O、Na2O 4.5~5.5%.Into one
Step, the rice husk is rice processing waste, after crushed, crosses the resulting powdered rice hulls of 50 meshes.
A kind of preparation method of above-mentioned heavy metal pollution place slip casting renovation agent, comprising the following steps: step 1) preparation
Biomass active powdered carbon: collecting municipal pollution and handle plant excess sludge, after dehydrating and removing impurities, keeps moisture content 80 ~ 85%, with
Nitrogen is protection gas, obtains activated carbon from activated sludge, after crushed, mistake through 700 ~ 820 DEG C of 20 ~ 30min of charing in retort
50 meshes obtain activated carbon from activated sludge powder.Step 2 prepares modified meerschaum powder: 100 mesh will be crossed after sepiolite raw ore ball milling
Sieve is soaked in 50min in the dilute hydrochloric acid that mass percent concentration is 5 ~ 8%, obtains hydrochloric Acid Modification sepiolite after natural drying,
After crushed, it sieves with 100 mesh sieve and obtains modified meerschaum powder.Step 3) prepares bentonite in powder: by mistake after bentonite raw ore ball milling
100 meshes are to get bentonite in powder.Step 4) prepares powdered rice hulls: carrying out after the rice husk of collection is removed soil, straw with 10 mesh scalpings
It crushes, crosses 50 meshes to get powdered rice hulls.Step 5) prepares powder premix: by step 1), 2), 3), 4) prepared by raw material press
Mass percent meter (biomass active powdered carbon 15 ~ 40%, modified meerschaum powder 10 ~ 40%, bentonite in powder 10 ~ 45%, powdered rice hulls 10 ~
25%) spare after evenly mixing, obtain powder premix.Step 6) prepares live mixed liquid: live mixed liquid is that mass concentration is
10 ~ 20% ammonium bicarbonate aqueous solution.The preparation of step 7) heavy metal pollution place slip casting renovation agent: will be prepared by step 5)
Powder premix is mixed evenly with live mixed liquid prepared by step 6) by quality proportioning 3:7 ~ 4:6, obtains having good
The slurry of good mobility to get arrive heavy metal pollution place slip casting renovation agent.
Compared with prior art, the beneficial effects of the present invention are: 1. present invention, which utilize, utilizes the specific of various formula components
Effect achievees the purpose that the heavy metal in fixed-contamination place by the synergistic effect of each ingredient, reduces a huge sum of money in contaminated site
The activity and ecological effectiveness of category, can effectively repair Cu2+、Zn2+、Pb2+、Cd2+、Ni2+Caused by one or more heavy metals
Contaminated sites.2. present invention process is simple, raw material is cheap and easy to get, without external heavy metal, securely and reliably.3. construction party of the present invention
Just, work progress is easily managed, and pipeline, equipment are less scaling, block.
Detailed description of the invention
Fig. 1 ~ 10 are that the soil layer of 5 point 0.1m, 0.7m depth of slip casting reparation in application examples 1 of the present invention is continuously supervised for a long time
Survey result.
Fig. 1 changes over time rule for the content of beary metal in 0.1m depth soil layer of point 1 after slip casting reparation；
Fig. 2 changes over time rule for the content of beary metal in 0.7m depth soil layer of point 1 after slip casting reparation；
Fig. 3 changes over time rule for the content of beary metal in 0.1m depth soil layer of point 2 after slip casting reparation；
The content of beary metal in 0.7m depth soil layer of point 2 changes over time rule after Fig. 4 slip casting reparation；
The content of beary metal in 0.1m depth soil layer of point 3 changes over time rule after Fig. 5 slip casting reparation；
The content of beary metal in 0.7m depth soil layer of point 3 changes over time rule after Fig. 6 slip casting reparation；
Fig. 7 changes over time rule for the content of beary metal in 0.1m depth soil layer of point 4 after slip casting reparation；
Fig. 8 changes over time rule for the content of beary metal in 0.7m depth soil layer of point 4 after slip casting reparation；
Fig. 9 changes over time rule for the content of beary metal in 0.1m depth soil layer of point 5 after slip casting reparation；
Figure 10 changes over time rule for the content of beary metal in 0.7m depth soil layer of point 5 after slip casting reparation.
Specific embodiment
The present invention is further illustrated with reference to embodiments, but is only citing, does not constitute to limit of the invention
System.Following embodiment material therefor be it is commercially available, for rice husk collected from farmers', no specified otherwise is conventional method.
Slip casting renovation agent in heavy metal pollution place of the present invention of embodiment 1 and preparation method thereof
A kind of heavy metal pollution place slip casting renovation agent of the present invention presses quality by powder premix and live mixed liquid
It is mixed to prepare than 3:7；The quality proportioning of each substance in powder premix are as follows: 35 parts of biomass active powdered carbon, modified meerschaum powder
15 parts, 30 parts of bentonite in powder, 20 parts of powdered rice hulls；The quality proportioning of live mixed liquid are as follows: 18 parts of ammonium hydrogen carbonate, 82 parts of water；It is raw
Species activity powdered carbon is made by following methods: being collected municipal pollution and is handled plant excess sludge, after dehydrating and removing impurities, keeps moisture content
80%, it is protection gas with nitrogen, obtains activated carbon from activated sludge, after crushed, mistake through 780 DEG C of charing 25min in retort
50 meshes obtain activated carbon from activated sludge powder；Modified meerschaum powder is made by following methods: by mistake after sepiolite raw ore ball milling
100 meshes are soaked in 50min in the dilute hydrochloric acid that mass percent concentration is 8%, hydrochloric Acid Modification Hai Pao are obtained after natural drying
Stone sieves with 100 mesh sieve after crushed to get modified meerschaum powder is arrived, sepiolite raw ore component used is as shown in table 1.Bentonite
Powder is made by following methods: will be sieved with 100 mesh sieve after bentonite raw ore ball milling to get bentonite in powder, bentonite raw ore component used
As shown in table 2.Powdered rice hulls are made by following methods: being crushed after the rice husk of collection is removed soil, straw with 10 mesh scalpings, mistake
50 meshes are to get powdered rice hulls.
Embodiment 2 ~ 5
Difference from Example 1 is raw material proportioning difference, and the preparation method is the same as that of Example 1.Wherein, embodiment 2 ~
In 3 raw material proportioning, by mass, powder premix: live mixed liquid=3:7, the quality proportioning of scene mixed liquid used are as follows:
15 parts of ammonium hydrogen carbonate, 85 parts of water；In the raw material proportioning of embodiment 4 ~ 5, by mass, powder premix: live mixed liquid=4:6,
The quality proportioning of scene mixed liquid used are as follows: 20 parts of ammonium hydrogen carbonate, 80 parts of water.The powder premix raw material proportioning of embodiment 2 ~ 5
As shown in table 3.
Application examples 1
Plot is left in the resettlement of Shaanxi Province's Hanzhong City machining factory, to underground 0.1m, 0.7m soil sample after drill hole sampling
Content of beary metal is measured, and 5 hole location soil sample determining heavy metals results are as shown in table 4 ~ 8.The background value of each heavy metal element
Take the arithmetic mean of instantaneous value " Chinese soil background values of elements " of Shaanxi Province A layers, C layers soil background.
Contaminated site is uniformly punched, divides three layers of progress high-pressure slip-casting, grouting amount by 1.8m, 1.1m, 0.5m depth
Identical, point 1 ~ 5 carries out slip casting reparation using slip casting renovation agent in heavy metal pollution place prepared by embodiment 1 ~ 5 respectively, together
When continuous monitoring is carried out to the soil layer of each point 0.1m, 0.7m depth.
Connected applications example 1 is as can be seen that use heavy metal pollution place slip casting renovation agent and preparation method thereof of the invention
The heavy metal pollution place slip casting renovation agent of preparation repairs heavy metal pollution place, can be effectively reduced heavy metal copper,
The content of zinc, lead, nickel repairs 90d or so in slip casting, and the copper, zinc, lead, nickel in heavy metal pollution place are close to or reach this
The soil background in area.
The specific embodiment of invention is described above, it should be pointed out that those skilled in the art are not departing from
Under the premise of the principle of the invention, for heavy metal pollution contaminated sites situation, the corresponding material proportion in the present invention is made
Deformation and modification, also should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of heavy metal pollution place slip casting renovation agent, which is characterized in that the heavy metal pollution place slip casting renovation agent
It is made of powder premix and live mixed liquid, by mass percentage, powder premix and live mixed liquid mass ratio are 3:7
~ 4:6, further, the quality percentage composition of the powder premix are as follows: biomass active powdered carbon 15 ~ 40%, modified Hai Pao
Mountain flour 10 ~ 40%, bentonite in powder 10 ~ 45%, powdered rice hulls 10 ~ 25%, live mixed liquid are ammonium bicarbonate aqueous solution, ammonium hydrogen carbonate
Mass percent concentration is 10 ~ 20%.
2. slip casting renovation agent in heavy metal pollution place according to claim 1, it is characterised in that: the biomass active
Powdered carbon is prepared as a raw material with city domestic sewage processing plant excess sludge.
3. a kind of heavy metal pollution place slip casting renovation agent according to claim 1, it is characterised in that: the modified sea
Afrodite powder is hydrochloric Acid Modification sepiolite powder, prepares the sepiolite raw ore of the modified meerschaum powder its main chemical compositions by quality
Percentages: SiO252 ~ 55%, CaO, MgO 23 ~ 35%, Al2O3、Fe2O3、FeO 4~8%。
4. slip casting renovation agent in heavy metal pollution place according to claim 1, it is characterised in that: the bentonite in powder is
Sieve with 100 mesh sieve resulting bentonite in powder, main chemical compositions by mass percentage: SiO265 ~ 68%, Al2O3、Fe2O3 12
~ 17%, CaO, MgO, K2O、Na2O 4.5~5.5%。
5. slip casting renovation agent in heavy metal pollution place according to claim 1, it is characterised in that: the powdered rice hulls are by water
Rice processing waste rice husk crushed 50 meshes and be made.
6. the preparation method of slip casting renovation agent in heavy metal pollution place according to claim 1 the steps include: (A) biology
The preparation of activated carbon powder: collecting city domestic sewage and handle plant excess sludge, after dehydrating and removing impurities, keep moisture content 80 ~
85%, it is protection gas with nitrogen, activated carbon from activated sludge is obtained through 700 ~ 820 DEG C of 20 ~ 30min of charing in retort, through crushing
Afterwards, 50 meshes are crossed and obtains activated carbon from activated sludge powder, 100 the preparation of (B) modified meerschaum powder: will be crossed after sepiolite raw ore ball milling
Mesh is soaked in 50min in the dilute hydrochloric acid that mass percent concentration is 5 ~ 8%, hydrochloric Acid Modification Hai Pao is obtained after natural drying
Stone sieves with 100 mesh sieve after crushed and obtains modified meerschaum powder, the preparation of (C) bentonite in powder: after bentonite raw ore ball milling
Sieve with 100 mesh sieve to get bentonite in powder, the preparation of (D) powdered rice hulls: it is laggard that the 10 mesh scalpings of the rice husk of collection are removed soil, straw
Row crushes, and crosses 50 meshes to get powdered rice hulls, the preparation of (E) powder premix: will be prepared by step (A), (B), (C), (D)
Raw material is uniformly mixed by certain quality proportioning up to powder premix, the preparation of the scene (F) mixed liquid: is matched by certain quality
Than ammonium hydrogen carbonate is dissolved in water, live mixed liquid is obtained, the preparation of (G) heavy metal pollution place slip casting renovation agent: and by certain
Quality proportioning live mixed liquid prepared by powder premix prepared by step (E) and step (F) is mixed, obtain
Slurry with good fluidity to get arrive heavy metal pollution place slip casting renovation agent.
7. according to the method described in claim 6, it is characterized in that, the heavy metal pollution place slip casting renovation agent can be repaired
Cu in contaminated site2+、Zn2+、Pb2+、Cd2+、Ni2+One or more of.
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| CN201510966207.9A CN105602568B (en) | 2015-12-22 | 2015-12-22 | A kind of heavy metal pollution place slip casting renovation agent and preparation method thereof |
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Patent Citations (7)
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| CN102807872A (en) * | 2012-08-21 | 2012-12-05 | 中国科学院沈阳应用生态研究所 | Biochar mixing type protected horticultural vegetable field soil heavy metal passivant and preparation method thereof |
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