CN105884277B - A kind of method that utilization heavy metal polluted soil prepares concrete - Google Patents
A kind of method that utilization heavy metal polluted soil prepares concrete Download PDFInfo
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- CN105884277B CN105884277B CN201610223288.8A CN201610223288A CN105884277B CN 105884277 B CN105884277 B CN 105884277B CN 201610223288 A CN201610223288 A CN 201610223288A CN 105884277 B CN105884277 B CN 105884277B
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- polluted soil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Processing Of Solid Wastes (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a kind of method that utilization heavy metal polluted soil prepares concrete, this method carries out curing process using cement heavy metal Polluted Soil, improve the stability of heavy metal, it is molded by high pressure compression, make the quick diagenesis of heavy metal polluted soil, carbonization treatment is carried out to solidification Polluted Soil using carbon dioxide, make the increase of solidification Polluted Soil hardness, water imbibition, basicity and hole reduce, the dissolution risk reduction of pollutant, carbonization Polluted Soil after broken is as aggregate, by adding cement, river sand and water, and the concrete of varying strength is formed after stirring.The present invention realizes the recycling of heavy metal polluted soil, with the features such as intensity is big, the small, price of pollution is low and easy to make.
Description
Technical field
The present invention relates to the preparation method of concrete, especially a kind of utilization heavy metal polluted soil prepares the side of concrete
Method.
Background technology
According to statistics, the hm of China about 1,400,0002Irrigation District of Sewage in, there are about 64.8% soil by heavy metal pollution, mesh
Before, for heavy metal polluted soil reparation, generally using techniques such as elution, solidification and stabilizations.Soil chemistry elution recovery technique effect
Rate is high, speed is fast and ratio more thoroughly, but the bargain price of eluent solution is higher, secondary pollution phenomenon protrusion.Solidification and stabilization skill
Art is easy to operate, with low cost, but long-time stability are good, and the soil resource utilization ways after processing are limited.CN
103803881A discloses a kind of Brick Making From Heavy-meatl-polluted Soil method, and it is first to elute heavy metal polluted soil to add phosphorus ore afterwards
Slag and cement brickmaking, it is achieved thereby that the recycling of heavy metal polluted soil and phosphorus ore slag.But at present still not with a huge sum of money
Category Polluted Soil prepares the report of concrete.
The need for infrastructure, China needs substantial amounts of concrete every year, therefore, to Building woods such as stone material, river sands
The demand of material is also larger, and these natural resources are also continuous exhausted.It is one using heavy metal polluted soil as aggregate
Bar is feasible by way of but how controlling the release of heavy metal in Polluted Soil, and it is that realize should to improve the intensity of aggregate
The important bottleneck of approach.
The content of the invention
The purpose of the present invention prepares concrete for above-mentioned problem there is provided a kind of utilization heavy metal polluted soil
Method, its technical solution is：
A kind of method that utilization heavy metal polluted soil prepares concrete, this method comprises the following steps：
1) heavy metal polluted soil is mixed with cement, stirred, cement and the weight ratio of heavy metal polluted soil dry weight are
1：3~7, the continuation that then adds water is stirred, and the mass ratio of water and cement and heavy metal polluted soil gross dry weight is 1：4~6, premixed
Material；
2) by premix under 0.8~1.5MPa pressure compaction moulding, obtain dry density for 1.5~2.5 tons/m3It is pre-
Mixed block；
3) premix block is put and conserved 5~10 days in atmosphere, moisture content is less than 5%；
4) premix block is placed under high-pressure carbon dioxide and is carbonized 20~30 hours again, the Stress control of carbon dioxide 8~
15kPa；
5) the premix block after carbonization is crushed, sieved, obtain the aggregate that particle diameter is 10~20mm；
6) by aggregate and cement, river sand, water, routinely ratio is mixed, then adds 1.5~3% thereto
Cement water reducing agent, stirring, is made concrete.
Preferably, step 1) in, the mass ratio of cement and heavy metal polluted soil dry weight is 1：5.
Preferably, step 1) in, the mass ratio of water and cement and heavy metal polluted soil gross dry weight is 1：5.
Preferably, step 2) in, the dry density of the premix block is 2 tons/m3。
The beneficial effects of the invention are as follows：
Solidification and stabilization processing is carried out using cement heavy metal Polluted Soil, reacted by the absorption of heavy metal, precipitation etc.
Principle, reduces the environmental risk of aggregate, and hydrated reaction of cement is improved aggregate intensity, is molded using high pressure compression, makes solid
Change the quick diagenesis of Polluted Soil, carbonization treatment is carried out using carbon dioxide, generate a large amount of carbon calcium, improve the hardness of aggregate, simultaneously
Aggregate basicity and porosity are reduced, reduces the release of pollutant and the water imbibition of aggregate in aggregate.Aggregate after broken has rock
The property of stone, by adding river sand fine aggregate, cement and water, can form the concrete with some strength grade after stirring.Should
Concrete not only solves the process problem of heavy metal polluted soil, and preparation process is simple, and environmental pollution is small, and compression strength is big
And be a kind of resources conservation and environment-friendly construction material stably.
Embodiment
The present invention is described in further detail with reference to embodiment.
Embodiment 1
A kind of method that utilization heavy metal polluted soil prepares concrete, its step is as follows：
1) heavy metal polluted soil is placed in agitating device, addition cement is stirred, and cement is done with heavy metal polluted soil
The mass ratio of weight is 1：5, stir 2 minutes, cement and heavy metal polluted soil is uniformly mixed, then add again into agitating device
Add water, the mass ratio of water and cement and heavy metal polluted soil gross dry weight is 1：5, the moisture content both can ensure that hydrated reaction of cement
Carry out, solidification can be made to pollute soil pressure again and obtain closely knit, stir 5 minutes, form mixture, in the presence of water, aquation occurs for cement
Reaction, hydrated product of the generation with gelling characteristic makes the increase of heavy metal polluted soil intensity, and porosity reduces, and hydrated product leads to
Physics chemical action is crossed, such as adsorbs, precipitate, wrap up, heavy metal in Polluted Soil is passivated；
2) by premix compaction moulding, using brick machine or forcing press, compaction force is 1MPa, and it is 2 to make premix block dry density
Ton/m3, compaction makes solidification Polluted Soil more closely knit, and hydrated product interacts with soil particle, and being formed has dense mess
Shape structured aggregate body, solidifies Polluted Soil gradually lithification, and intensity constantly increases.
3) premix block is put and conserved in atmosphere, hydration reaction in premix block is carried out complete, maintenance 7 days, make premix block
Moisture content is less than 5%, it is therefore an objective to makes formed body while gain in strength, internal void is got through, is that the entrance of carbon dioxide is carried
For path.
4) premix block is placed in carbonizing plant again and be carbonized, pressure carbon dioxide is controlled in 10kPa, makes carbon dioxide
It can be carbonized 24 hours well into premix block, it is ensured that premix block carbonization is complete, carbon dioxide can occur anti-with hydrated product
Should, the higher novel substance of generation intensity, it is possible to the hole in filling premix block makes the increase of premix bulk strength, water imbibition, basicity
Reduce with hole, pollutant release reduces.
5) the premix block after carbonization is crushed, sieved, retained 10mm-20mm particle diameters, be used as aggregate, this bone
Expect that intensity is big, water imbibition is low；
6) obtained aggregate, cement, river sand and water are mixed in 3.68: 1: 1.81: 0.51 ratio, stirred
Mix, then add water reducer thereto, addition is the 2% of cement quality, and water reducer can improve the mobility of concrete, reduce water
Consumption, heavy metal pollution earth concrete is made.
Embodiment 2
A kind of method that utilization heavy metal polluted soil prepares concrete, its step is as follows：
1) heavy metal polluted soil is mixed with cement, stirred, cement and the mass ratio of heavy metal polluted soil dry weight are
1：3, the continuation that then adds water is stirred, and the mass ratio of water and cement and heavy metal polluted soil gross dry weight is 1：4, obtain premix；
2) by premix under 0.8MPa pressure compaction moulding, obtain dry density for 1.5 tons/m3Premix block；
3) premix block is put and conserved 5 days in atmosphere, moisture content is less than 5%；
4) premix block is placed under high-pressure carbon dioxide again and be carbonized 30 hours, the Stress control of carbon dioxide is in 8kPa；
5) the premix block after carbonization is crushed, sieved, obtain the aggregate that particle diameter is 10~20mm；
6) by aggregate and cement, river sand, water, routinely ratio is mixed, then addition 1.5% thereto is mixed
Concrete is made in solidifying soil water reducer, stirring.
Embodiment 3
A kind of method that utilization heavy metal polluted soil prepares concrete, its step is as follows：
1) heavy metal polluted soil is mixed with cement, stirred, cement and the mass ratio of heavy metal polluted soil dry weight are
1：7, the continuation that then adds water is stirred, and the mass ratio of water and cement and heavy metal polluted soil gross dry weight is 1：6, obtain premix；
2) by premix under 1.5MPa pressure compaction moulding, obtain dry density for 2.5 tons/m3Premix block；
3) premix block is put and conserved 10 days in atmosphere, moisture content is less than 5%；
4) premix block is placed under high-pressure carbon dioxide again and be carbonized 20 hours, the Stress control of carbon dioxide is in 15kPa；
5) the premix block after carbonization is crushed, sieved, obtain the aggregate that particle diameter is 10~20mm；
6) by aggregate and cement, river sand, water, routinely ratio is mixed, then the coagulation of addition 3% thereto
Native water reducer, stirring, is made concrete.
Determine compression strength, the Leaching of Heavy Metals concentration of concrete prepared by embodiment 1~3.Leaching concentration is used《Solid
Waste-Leaching leaching method horizontal vibration method》(HJ 557-2010) standard.As a result it see the table below：
——：Do not detect.
Claims (4)
1. a kind of method that utilization heavy metal polluted soil prepares concrete, this method comprises the following steps：
1) heavy metal polluted soil is mixed with cement, stirred, the mass ratio of cement and heavy metal polluted soil dry weight is 1：3~
7, the continuation that then adds water is stirred, and the mass ratio of water and cement and heavy metal polluted soil gross dry weight is 1：4~6, obtain premix；
2) by premix under 0.8~1.5MPa pressure compaction moulding, obtain dry density for 1.5~2.5 tons/m3Premix block；
3) premix block is put and conserved 5~10 days in atmosphere, moisture content is less than 5%；
4) premix block is placed under high-pressure carbon dioxide and is carbonized 20~30 hours again, the Stress control of carbon dioxide 8~
15kPa；
5) the premix block after carbonization is crushed, sieved, obtain the aggregate that particle diameter is 10~20mm；
6) by aggregate and cement, river sand, water, routinely ratio is mixed, then adds cement water reducing agent thereto,
Addition is the 1.5~3% of cement quality, and concrete is made in stirring.
2. the method for preparing concrete using heavy metal polluted soil as claimed in claim 1, it is characterised in that：Step 1) in, water
Mud and the mass ratio of heavy metal polluted soil dry weight are 1：5.
3. the method for preparing concrete using heavy metal polluted soil as claimed in claim 1, it is characterised in that：Step 1) in, water
Mass ratio with cement and heavy metal polluted soil gross dry weight is 1：5.
4. the method for preparing concrete using heavy metal polluted soil as claimed in claim 1, it is characterised in that：Step 2) in, institute
The dry density for stating premix block is 2 tons/m3。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108034432A (en) * | 2018-01-04 | 2018-05-15 | 台州泰捷化工科技有限公司 | A kind of heavy-metal contaminated soil renovation agent and its application |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107244843A (en) * | 2017-07-10 | 2017-10-13 | 北京首华科技发展有限公司 | A kind of pollution earth building blocks after processing and preparation method thereof |
| CN112251235B (en) * | 2020-10-23 | 2021-11-26 | 安徽理工大学环境友好材料与职业健康研究院(芜湖) | Preparation method of steel slag-based curing agent and treatment system and method of Cd-polluted soil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5276255A (en) * | 1992-12-30 | 1994-01-04 | Stark J Norman | Cementitious encapsulation of waste materials and/or contaminated soils containing heavy metals, to render them immobile |
| KR101220994B1 (en) * | 2011-03-16 | 2013-01-10 | 권은자 | The water-penetration packing materials using the binder composition that has the main stuff for soil |
| CN104110023A (en) * | 2014-07-31 | 2014-10-22 | 东南大学 | Device for processing lead pollution foundation by carbonization acceleration and operating method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108034432A (en) * | 2018-01-04 | 2018-05-15 | 台州泰捷化工科技有限公司 | A kind of heavy-metal contaminated soil renovation agent and its application |
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