CN112387768A - Method for ensuring long-term effect of chromium slag treatment - Google Patents
Method for ensuring long-term effect of chromium slag treatment Download PDFInfo
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- CN112387768A CN112387768A CN201910765082.1A CN201910765082A CN112387768A CN 112387768 A CN112387768 A CN 112387768A CN 201910765082 A CN201910765082 A CN 201910765082A CN 112387768 A CN112387768 A CN 112387768A
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- soil
- chromium slag
- slag treatment
- locking
- passivation
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention discloses a method for ensuring long-term effect of chromium slag treatment, which comprises the following steps: obtaining crushed polluted soil; adding 3% of reducing agent, stirring and mixing uniformly; keeping a certain water content of the polluted soil; adding a certain proportion of heavy metal passivation locking agent, stirring and curing; and when a hydrophobic layer is formed on the surface of the soil, the soil is in a granular massive structure, and the passivation and the locking are completed. The chromium slag treatment method provided by the invention not only can absorb the advantages of low cost, high efficiency, good stability and the like in practical engineering of the traditional wet method in-situ reduction technology, but also can greatly reduce the maintenance cost in the later period of the engineering, ensure the long-term effect of chromium slag treatment and provide a better choice for the field of sludge treatment.
Description
Technical Field
The invention relates to a chromium slag treatment method, in particular to a method for ensuring the long-term effect of chromium slag treatment.
Background
The chromium slag is industrial waste slag generated in the process of producing metal chromium and chromium salt, and has certain harm to human. In recent years, the environmental pollution caused by stacking of chromium slag has attracted much attention at home and abroad. The research on the characteristics of soil pollution of the chromium slag polluted site in China shows that the soil chromium content of the chromium slag polluted site is high (the highest total chromium mass concentration is 56000mg/kg), the surrounding underground water is polluted, the soil is alkaline, the residual chromium accounts for a large proportion, and certain spatial distribution characteristics are presented, and the chromium polluted site in China mainly comprises the following components: the method comprises the steps of leaving sites after 20 chromium salt factories are shut down, leaving sites for 40 historical chromium residues, thousands of electroplating (chromium plating) enterprise sites, hundreds of tanning enterprise sites and the like.
Chromium in soil and groundwater polluted by chromium mainly exists in two valence states of hexavalent chromium and trivalent chromium, wherein trivalent chromium is low in toxicity and high in stability, hexavalent chromium is strong in toxicity and easy to migrate, the most common repair technology is a chemical reduction method for achieving the purpose of reducing the toxicity and the mobility of chromium, and the method has the problems of secondary pollution introduction, limited repair capacity, poor long-term effectiveness and the like, and has attracted great attention of all relevant parties.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for ensuring the long-term effect of chromium slag treatment.
The invention provides a chromium slag treatment method, which comprises the following steps:
obtaining crushed polluted soil;
adding 3% of reducing agent, stirring and mixing uniformly;
keeping a certain water content of the polluted soil;
adding a certain proportion of heavy metal passivation locking agent, stirring and curing;
and when a hydrophobic layer is formed on the surface of the soil, the soil is in a granular massive structure, and the passivation and the locking are completed.
Preferably, the screening mesh number of the contaminated soil is greater than or equal to 10 meshes.
Preferably, the water content is 34-36%.
Preferably, the proportion of the heavy metal passivation and locking agent is 1%.
The chromium slag treatment method provided by the invention not only can absorb the advantages of low cost, high efficiency, good stability and the like in the actual engineering of the traditional wet method in-situ reduction technology, but also can greatly reduce the maintenance cost in the later period of the engineering and play the long-acting property of in-situ reduction stabilization detoxification. In addition, the soil structure after passivation and locking is compact, organic matter components of the soil can not be damaged, and the requirement of plant growth can be met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a first embodiment of the present invention;
fig. 2 is a flowchart of a second embodiment of the present invention.
Detailed Description
The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
It is to be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the generic and descriptive sense only and not for purposes of limitation, as the term is used in the generic and descriptive sense, and not for purposes of limitation, unless otherwise specified or implied, and the specific reference to a device or element is intended to be a reference to a particular element, structure, or component. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Implementation mode one
As shown in fig. 1, the technical solution provided by the present embodiment is as follows, including:
step S1O2, obtaining crushed polluted soil;
step S1O4, adding 3% of reducing agent, stirring and mixing uniformly;
S1O6, keeping a certain water content of the polluted soil;
step S1O8, adding a heavy metal passivation locking agent in a certain proportion, stirring and curing;
and step S110, when a hydrophobic layer is formed on the surface of the soil, the soil is in a granular massive structure, and the passivation and the locking are completed.
Wherein the screening mesh number of the polluted soil is more than or equal to 10 meshes.
The invention is a method for carrying out granulation and passivation and locking of heavy metals on soil on the basis of completing detoxification by the traditional wet in-situ reduction technology aiming at chromium pollution sites with high pollution concentration and complex mixed pollution conditions.
The polluted soil particles treated by the method can form stable super-hydrophobic capsules, so that the moisture of the soil can be locked in the granules to shorten the maintenance period of the detoxified soil, and the granular soil loaded with the super-hydrophobic capsules has a special structure to lock heavy metal ions in the capsules to prevent the environment from being polluted by outflow of harmful substances.
The detoxification process requires water-containing maintenance of the contaminated soil to meet the full reaction of the reducing agent. A large number of engineering experiences show that the long-term effect of the reduction reaction is difficult to meet depending on the natural environment after the soil is restored and buried by adopting the pure wet detoxification, and the heavy metal in the soil which is stably reduced is easy to lose efficacy due to the influence of the natural environment, the climate and the like, so that the wet reduction detoxification and soil agglomeration super-hydrophobic encapsulation method can absorb the advantages of low cost, high efficiency, good stability and the like in the actual engineering, and the agglomeration super-hydrophobic encapsulation structure can also greatly reduce the maintenance cost in the later period of the engineering and exert the long-term effect of the in-situ reduction stabilization detoxification.
The pH value of the detoxified soil can be maintained by adopting a passivation and locking method (the pH value of the detoxified soil needs to be controlled), the structure of the clustered and encapsulated soil is compact, the organic matter components of the soil are not damaged, and the requirement of plant growth can be met. After passivation and locking, the granular encapsulated soil can form a layer of super-hydrophobic structure on the surface under a certain water content, the granular soil can block the water molecules and heavy metal ions from entering and exiting, harmful substances can be cured, the harmful substances are prevented from flowing out to pollute the surrounding environment, the granular encapsulated soil can be rapidly recycled as landfill soil after treatment is completed, and the risk coefficient is greatly reduced. The method has high passivation and locking efficiency by matching with detoxified soil with a certain water content, can be quickly cured under the condition of simple engineering mechanical stirring, and obviously improves the operating efficiency.
Meanwhile, after the detoxified soil is treated by a passivation and locking method, the surface of the pelletized soil has extremely strong hydrophobic property, a layer of invisible protective clothing is provided for the detoxified soil, and the leaching of harmful ingredients in the soil cannot be caused by the daily washing of rainwater and groundwater, so that the soil remediation has long-term effect.
As shown in fig. 2, the technical solution provided by the present embodiment includes:
step S1O2, obtaining crushed polluted soil;
step S1O4, adding 3% of reducing agent, stirring and mixing uniformly;
S1O7, keeping the water content of the polluted soil to be 34-36%;
step S1O9, adding 1% of heavy metal passivation locking agent, stirring and curing;
and step S110, when a hydrophobic layer is formed on the surface of the soil, the soil is in a granular massive structure, and the passivation and the locking are completed.
Wherein, when the water content of the polluted soil is kept between 34 and 36 percent, the reducing agent reacts most fully.
When the proportion of the added heavy metal passivation and locking agent is 1%, the soil structure of the granular massive structure is more compact, organic matter components of the soil can not be damaged, and the requirement of plant growth can be better met.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that there are no specific structures but a few objective structures due to the limited character expressions, and that those skilled in the art may make various improvements, decorations or changes without departing from the principle of the invention or may combine the above technical features in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (4)
1. A method for ensuring long-term effectiveness of chromium slag treatment is characterized by comprising the following steps:
obtaining crushed polluted soil;
adding 3% of reducing agent, stirring and mixing uniformly;
keeping a certain water content of the polluted soil;
adding a certain proportion of heavy metal passivation locking agent, stirring and curing;
and when a hydrophobic layer is formed on the surface of the soil, the soil is in a granular massive structure, and the passivation and the locking are completed.
2. A chromium slag treatment method as claimed in claim 1, wherein the contaminated soil has a mesh size of 10 mesh or more.
3. The chromium slag treatment method according to claim 1, wherein the water content is 34-36%.
4. The chromium slag treatment method according to claim 1, wherein the proportion of the heavy metal passivation and locking agent is 1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910765082.1A CN112387768A (en) | 2019-08-19 | 2019-08-19 | Method for ensuring long-term effect of chromium slag treatment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910765082.1A CN112387768A (en) | 2019-08-19 | 2019-08-19 | Method for ensuring long-term effect of chromium slag treatment |
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| CN112387768A true CN112387768A (en) | 2021-02-23 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103084385A (en) * | 2013-01-28 | 2013-05-08 | 韩清洁 | Repairation method of chromium-polluted soil and corresponding equipment thereof |
| CN103316904A (en) * | 2013-04-10 | 2013-09-25 | 天津市环境保护科学研究院 | Repairing method of chromium polluted soil |
| CN105238408A (en) * | 2014-07-10 | 2016-01-13 | 湖南恒凯生态环保修复药剂有限公司 | Stable mineralized repairing agent applied to Cr soil pollution and technological method thereof |
| CN106180172A (en) * | 2016-07-18 | 2016-12-07 | 中国石油大学(华东) | Chromium-polluted soil humic acids green in-situ renovation technique |
| CN107254315A (en) * | 2017-07-13 | 2017-10-17 | 广西博世科环保科技股份有限公司 | The multilevel reduction stabilization agent and its application method of hexavalent chromium polluted soil |
| CN108160684A (en) * | 2017-12-27 | 2018-06-15 | 辽宁工程技术大学 | A kind of combined remediation method of pollution of chromium soil |
| CN109351769A (en) * | 2018-12-10 | 2019-02-19 | 中国石油大学(华东) | Heavy-metal contaminated soil humic acid green in-situ solidifies renovation technique |
-
2019
- 2019-08-19 CN CN201910765082.1A patent/CN112387768A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103084385A (en) * | 2013-01-28 | 2013-05-08 | 韩清洁 | Repairation method of chromium-polluted soil and corresponding equipment thereof |
| CN103316904A (en) * | 2013-04-10 | 2013-09-25 | 天津市环境保护科学研究院 | Repairing method of chromium polluted soil |
| CN105238408A (en) * | 2014-07-10 | 2016-01-13 | 湖南恒凯生态环保修复药剂有限公司 | Stable mineralized repairing agent applied to Cr soil pollution and technological method thereof |
| CN106180172A (en) * | 2016-07-18 | 2016-12-07 | 中国石油大学(华东) | Chromium-polluted soil humic acids green in-situ renovation technique |
| CN107254315A (en) * | 2017-07-13 | 2017-10-17 | 广西博世科环保科技股份有限公司 | The multilevel reduction stabilization agent and its application method of hexavalent chromium polluted soil |
| CN108160684A (en) * | 2017-12-27 | 2018-06-15 | 辽宁工程技术大学 | A kind of combined remediation method of pollution of chromium soil |
| CN109351769A (en) * | 2018-12-10 | 2019-02-19 | 中国石油大学(华东) | Heavy-metal contaminated soil humic acid green in-situ solidifies renovation technique |
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