CN104128361B - A kind of slag stockyard and heavy-metal contaminated soil Treatment process - Google Patents
A kind of slag stockyard and heavy-metal contaminated soil Treatment process Download PDFInfo
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- CN104128361B CN104128361B CN201410324505.3A CN201410324505A CN104128361B CN 104128361 B CN104128361 B CN 104128361B CN 201410324505 A CN201410324505 A CN 201410324505A CN 104128361 B CN104128361 B CN 104128361B
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- clay
- slag
- compacting
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Abstract
The invention discloses a kind of slag stockyard and heavy-metal contaminated soil Treatment process, first field internal contamination soil and slag are adopted mechanical mixture compacting, as slag top layer; Mixed with quick lime by cleaning soil and adopt mechanical ramming, cleaning soil and quick lime ratio are 10:1, and thickness is 10cm, form an alkaline alkaline residue separation layer on slag top layer, and the change of acid-base value significantly can reduce the dispersal ability of heavy metal ion; Clay is covered alkaline residue insulation surface, adopt the heavy road roller of 5t evenly to roll, ensure that compacting factor reaches more than 90%, compacted depth is 10cm; By the surface of clay of zeolite uniform fold in compacting, zeolite thickness is 2cm; Again on zeolite, cover clay, after compacting, thickness is 10cm; The cleaning soil that after completing, approximately 80cm is thick in clay compaction surface coverage again.Whole closed separation layer has been constructed.The invention has the beneficial effects as follows that the contaminated soil cost of process is low.
Description
Technical field
The invention belongs to remediation contaminated soil technical field, relate to a kind of slag stockyard and heavy-metal contaminated soil Treatment process.
Background technology
The mine tailing produced in mineral process needs large-area accumulation place, thus causes taking soil excessive and destruction to original ecosystem.Containing especially in mine tailing is sour, containing the material such as alkali or heavy metal, meeting stripping under the drip washing of rainwater, pollutes soil, the underground water of periphery.Existing slag and heavy-metal contaminated soil Treatment process are generally by slag recycling, mix with curing agent (cement, silicate, pitch etc.) by a certain percentage, the very low solid mixture of permeability is finally formed through slaking, thus alleviating the pollution of heavy metal, product can be used for building material.
Weak point is that in current slag stockyard, accumulating amount is huge, needs a large amount of curing agent, and cost is comparatively large, and contaminated soil texture can be destroyed in addition, loses the original function of soil.In addition the recycling in whole accumulation place does not realize.
Summary of the invention
The object of the present invention is to provide a kind of slag stockyard and heavy-metal contaminated soil Treatment process, solve the problem of the contaminated soil high cost of prior art process.
The technical solution adopted in the present invention is carried out according to following steps:
Step 1: field internal contamination soil and slag are adopted mechanical mixture compacting, as slag top layer;
Step 2: cleaning soil is mixed with quick lime and adopts mechanical ramming, cleaning soil and quick lime ratio are 10:1, thickness is 10cm, forms an alkaline alkaline residue separation layer on slag top layer, and the change of acid-base value significantly can reduce the dispersal ability of heavy metal ion;
Step 3: clay is covered alkaline residue insulation surface, adopt the heavy road roller of 5t evenly to roll, ensure that compacting factor reaches more than 90%, compacted depth is 10cm;
Step 4: by the surface of clay of zeolite uniform fold in compacting, zeolite thickness is 2cm;
Step 5: again cover clay on zeolite, after compacting, thickness is 10cm;
Step 6: the cleaning soil that after completing, approximately 80cm is thick in clay compaction surface coverage again.Whole closed separation layer has been constructed.
Further, water penetration K≤1 × 10 of clay in described step 3
-6, include the fine granules of more than 30% in clay material, plasticity index is between 10-25.
Further, described step 4 mesolite particle size≤0.15mm.
Further, described step 3,4,5 forms impervious barrier layer.
The invention has the beneficial effects as follows that the contaminated soil cost of process is low.
Accompanying drawing explanation
Fig. 1 is impervious barrier layer schematic diagram;
Fig. 2 is that the present invention carries out experimental provision schematic diagram to the soil after process;
Fig. 3 is different times diffusate Cr concentration value;
Fig. 4 is different times diffusate Cu concentration value;
Fig. 5 is different times diffusate As concentration value.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
A kind of new slag stockyard and heavy-metal contaminated soil Treatment process are the object of this invention is to provide, the method has good stability, good environment friendly, with low cost, not only effectively can intercept down and ooze the drip washing of rainwater to slag, reduce the stripping of heavy metal ion, can adsorb the heavy metal ion of stripping again simultaneously, reach the effect better controlling heavy metal ion diffusion mobility.
Object of the present invention is achieved by the following technical programs:
Step 1: first sample to place, by analyzing the data determination polluted soil scope and earth volume that detect, adopts mechanical mixture compacting, as slag top layer by field internal contamination soil and slag;
Step 2: mixed with quick lime by cleaning soil and adopt mechanical ramming, cleaning soil and quick lime ratio are 10:1, and thickness is 10cm.Cleaning soil is never transported in place by heavy metal pollution region, after cleaning soil and lime mix compacting, forms an alkaline alkaline residue separation layer on slag top layer, and the change of acid-base value significantly can reduce the dispersal ability of heavy metal ion;
Step 3: clay is covered alkaline residue insulation surface, clay can be got from outside, adopt the heavy road roller of 5t evenly to roll, ensure that compacting factor reaches more than 90%, dry density after compacting factor and clay compacting and the percentage of standard maximum dry density, water penetration K≤1 × 10 of clay
-6, possess shearing strength, shrink gesture; Possess micro-to waterproof, obstruct Adsorption of Heavy Metals function, compacted depth is 10cm;
Clay material should meet: should include the fine granules of more than 30% in earth material; The plasticity index of earth material is between 10-25;
Step 4: by the surface of clay of zeolite uniform fold in compacting, zeolite thickness is 2cm;
Zeolitic material should meet addition: zeolite and clay mass ratio >=5% obtained from step 3, particle size≤0.15mm; Have particle diameter is little, specific area large, be suitable for pore structure and surface texture, heavy metal ion has stronger suction-operated, after testing heavy metal free to pollute (lower than standard limited value).
Step 6: again cover clay on zeolite, after compacting, thickness is 10cm;
Step 7: the cleaning soil that after completing, approximately 80cm is thick in clay compaction surface coverage again.Whole closed separation layer has been constructed.
Clay described in step 4 is the important interpolation raw material of the present invention, and addition is 130m
9~ 200m
3/ mu.Can increase and decrease according to actual conditions in Specific construction process.
Zeolite described in step 5, must meet particle size≤0.15mm, and addition is every mu of 23t ~ 35t/ mu, can increase and decrease in Specific construction process according to actual conditions.
The present invention is utilized in slag stockyard, somewhere, and actual effect shows: this technology is oozed under can effectively intercepting rainwater, decreases the heavy metal ion stripping caused due to rainwater drip washing; Existence due to separation layer can reduce the murder by poisoning of heavy metal ion to upper strata crops, ensure that the quality safety of agricultural product.
With the huge sum of money pollution control of Luzhou City slag stockyard, Sichuan Province for pilot, Seal treatment is carried out to contaminated soil and slag.Test the soil after process, table 1 is clay fundamental property used.Table 2 is heavy metal solution concentration value.
Table 1. clay fundamental property
Table 2 heavy metal solution concentration value
Experimental provision and method:
Experimental rig is by organic transparent glass tube, support stand, and eluate collection container forms.Lucite bore is 210mm, pipe range 6000mm, and impervious barrier thickness is 210mm, and lower end is established the thick gravel filtering layer of 20mm and is lined with filter paper.Pour the heavy metal solution of certain volume concentration known in impervious barrier upper end into, collect diffusate and measure its heavy metal concentration.Monitoring project: Cr, Cu, As concentration.The following Fig. 2 of experimental provision.
Result of the test: the heavy metal solution of device upper end starts have a small amount of solution to ooze out pouring device into after the 7th day, every cadmium gets diffusate analysis in 7 days, by analyzing the concentration of heavy metal in different times diffusate, Cr concentration is between 0.001-0.006mg/l, Cu concentration is at 0.003-0.005, the concentration of As between 0.001-0.007, all far below heavy metal concentration in original solution.Result shows: impervious barrier layer heavy metal ion has good adsorption effect, and adsorption efficiency reaches more than 99%.Different times diffusate heavy metal concentration value is as Fig. 3 to Fig. 5.
Feature of the present invention is to carry out closed isolation processing to slag and contaminated soil, both can prevent from causing heavy metal ion stripping because of rainwater drip washing, polluted underground water and soil, even there is the stripping of heavy metal ion, porous neutral material meeting Adsorption of Heavy Metal Ions, prevents further diffusive migration; In addition, can carry out soil moved in improve the original process above confining bed, the social need-oriented realizing place is worth.After carrying out closed isolation processing, the stripping of heavy metal ion can be reduced, and adsorb the heavy metal ion of stripping, harm reduction.Reduce the processing cost in whole stockyard, the social need-oriented in the stockyard achieved is worth, and can bring certain economic benefit to locality.
The above is only to better embodiment of the present invention, not any pro forma restriction is done to the present invention, every any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong in the scope of technical solution of the present invention.
Claims (1)
1. slag stockyard and a heavy-metal contaminated soil administering method, is characterized in that carrying out according to following steps:
Step 1: field internal contamination soil and slag are adopted mechanical mixture compacting, as slag top layer;
Step 2: cleaning soil is mixed with quick lime and adopts mechanical ramming, cleaning soil and quick lime ratio are 10:1, thickness is 10cm, forms an alkaline alkaline residue separation layer on slag top layer, and the change of acid-base value significantly can reduce the dispersal ability of heavy metal ion;
Step 3: clay is covered alkaline residue insulation surface, adopt the heavy road roller of 5t evenly to roll, ensure that compacting factor reaches more than 90%, compacted depth is 10cm;
Step 4: by the surface of clay of zeolite uniform fold in compacting, zeolite thickness is 2cm;
Step 5: again cover clay on zeolite, after compacting, thickness is 10cm;
Step 6: the cleaning soil that after completing, 80cm is thick in clay compaction surface coverage again; Whole closed separation layer has been constructed;
Water penetration K≤1 × 10 of clay in described step 3
-6, include the fine granules of more than 30% in clay material, plasticity index is between 10-25;
Described step 4 mesolite particle size≤0.15mm;
Described step 3,4,5 forms impervious barrier layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410324505.3A CN104128361B (en) | 2014-07-09 | 2014-07-09 | A kind of slag stockyard and heavy-metal contaminated soil Treatment process |
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|---|---|---|---|
| CN201410324505.3A CN104128361B (en) | 2014-07-09 | 2014-07-09 | A kind of slag stockyard and heavy-metal contaminated soil Treatment process |
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| CN104128361B true CN104128361B (en) | 2016-04-06 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105642642B (en) * | 2016-01-27 | 2018-03-06 | 辽宁工程技术大学 | A kind of composite closure structure of the Mine Solid Wastes landfill field of sulfur compound |
| CN108262341A (en) * | 2018-01-23 | 2018-07-10 | 北京高能时代环境技术股份有限公司 | A kind of quick repair method of heavy metal polluted soil of farmland |
| CN109183772A (en) * | 2018-07-31 | 2019-01-11 | 南京格洛特环境工程股份有限公司 | The blocking method of contaminated site reparation under no-dig technique mode |
| CN109526523B (en) * | 2019-01-04 | 2021-04-20 | 杰瑞(莱州)矿山治理有限公司 | Method for carrying out ecological restoration on acid tailing pond |
| CN110420963B (en) * | 2019-05-21 | 2021-01-15 | 中节能大地环境修复有限公司 | Method for curing pollutants in completely weathered layer |
| CN115012432A (en) * | 2022-07-04 | 2022-09-06 | 芷兰生态环境建设有限公司 | Ecological acid-blocking restoration method for metal mine acidic solid waste storage yard |
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