CN115636630B - Method for preparing gray soil by using shield slag soil - Google Patents
Method for preparing gray soil by using shield slag soil Download PDFInfo
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- CN115636630B CN115636630B CN202211276182.6A CN202211276182A CN115636630B CN 115636630 B CN115636630 B CN 115636630B CN 202211276182 A CN202211276182 A CN 202211276182A CN 115636630 B CN115636630 B CN 115636630B
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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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Abstract
The invention relates to the field of a method for preparing gray soil, in particular to a method for preparing gray soil by using shield slag soil, which comprises the following steps: s1, adding a defoaming agent into the obtained shield slag soil slurry to obtain a mixture A; s2, conveying the mixture A to a centrifugal machine for dehydration to obtain a solid mixture B and wastewater C; s3, calcining the solid mixture B in a high-temperature environment, and cooling to obtain a solid mixture D; sequentially performing flocculation precipitation and adsorption treatment on the wastewater C to obtain liquid E; s4, uniformly mixing the solid mixture D and the powder modifier to obtain a mixture F; adding liquid E to mixture F to obtain a viscous mixture G; s5, stacking the mixture G and naturally airing to obtain a mixture H; s6, crushing and grinding the mixture H, and sieving to obtain a gray soil finished product with the required particle size. The method can utilize the shield residue soil waste to prepare the gray soil so as to reasonably utilize resources and avoid harm to the environment.
Description
Technical Field
The invention relates to the field of a method for preparing gray soil, in particular to a method for preparing gray soil by using shield slag soil.
Background
The shield residue soil is waste materials discharged in the subway tunnel construction process. Along with the continuous improvement of the economic development level of China, the urban process is accelerated, more and more cities start to build subways, and the subway transportation fully plays the advantages of large self-transportation capacity and more shifts, enriches transportation means, serves the public, can effectively block ground traffic and is convenient for people to travel; but a large amount of shield residue soil waste is generated in the subway construction process, and the diameter of a tunnel interval is calculated according to 6m, so that about 4.5 square meters of soil can be discharged per kilometer of subway excavation. Only subway projects have produced about 2.83 hundred million square dregs by 2020, and subway projects under construction will also produce about 2.55 hundred million square dregs; the method has the advantages that the obtained shield slag soil treatment measures are mostly direct external transport landfill or dehydration external transport landfill in the subway tunnel construction process, the dehydration and transportation cost of the slag soil is high, a large amount of land resources are occupied after the shield slag soil is piled up, and meanwhile, the pile side slope has landslide disaster risk; the invention provides a method for preparing gray soil by using shield residue soil, which is used as an available resource and is directly buried to cause resource waste.
Disclosure of Invention
The invention aims at solving the problems in the background technology and provides a method for preparing gray soil by using shield slag soil.
The technical scheme of the invention is as follows: a method for preparing gray soil by using shield slag soil comprises the following specific steps:
s1, adding a defoaming agent into the obtained shield slag soil slurry to obtain a mixture A;
s2, conveying the mixture A to a centrifugal machine for dehydration to obtain a solid mixture B and wastewater C;
s3, calcining the solid mixture B in a high-temperature environment, and cooling to obtain a solid mixture D;
sequentially performing flocculation precipitation and adsorption treatment on the wastewater C to obtain liquid E;
s4, uniformly mixing the solid mixture D and the powder modifier to obtain a mixture F; adding liquid E to mixture F to obtain a viscous mixture G;
s5, stacking the mixture G and naturally airing to obtain a mixture H;
s6, crushing and grinding the mixture H, and sieving to obtain a gray soil finished product with the required particle size.
Preferably, in S2, a deodorant is added during the spin-drying of the mixture a.
Preferably, the process of performing adsorption treatment on the wastewater C in S3 is as follows: and (3) sequentially passing the flocculated and precipitated wastewater through a quartz particle layer, a biochemical sphere layer and an active carbon layer to obtain liquid E.
Preferably, the high temperature calcination process of the solid mixture B in S3 is:
s31, heating the solid mixture B, raising the temperature to 80 ℃ within 20-30 min, and preserving the heat for 10-20 min;
s32, continuing to heat, raising the temperature to 105 ℃ within 8-10 min, preserving heat for 10-15 min, and collecting the gas exhausted from the beginning of heating until the end of heat preservation to obtain gas a;
s33, continuing to heat, raising the temperature to 180 ℃ within 8-10 min, preserving heat for 10-15 min, and collecting the gas exhausted from the beginning of heating until the end of heat preservation to obtain gas b;
s34, continuously heating, raising the temperature to 290 ℃ within 8-10 min, preserving heat for 10-15 min, and collecting the gas exhausted from the beginning of heating until the end of heat preservation to obtain gas c;
s35, continuously heating, raising the temperature to 400 ℃ within 8-10 min, preserving heat for 10-15 min, and collecting the gas exhausted from the beginning of heating until the end of heat preservation to obtain gas d;
s36, cooling the high-temperature solid mixture in S35 to obtain a solid mixture D, and condensing and collecting the obtained gas a, gas b, gas c and gas D.
Preferably, the solid mixture D and the powder modifier in S4 are added in the following amounts: adding 0.03-0.05 part of powder modifier into every 100 parts of solid mixture D; the powder modifier comprises lime, cement, talcum powder, sodium carbonate, sodium alginate and lithium hydroxide.
Preferably, the powder modifier comprises the following components in parts by weight: 80-100 parts of lime, 20-35 parts of cement, 4-6 parts of talcum powder, 3-6 parts of sodium carbonate, 2-5 parts of sodium alginate and 1-4 parts of lithium hydroxide.
Preferably, in S5, the mixture G is stacked in a storage tank, and the dust suppression net is covered on the surface of the mixture G until the water content of the bottom layer of the mixture G is lower than 5%, so as to obtain a mixture H.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial technical effects:
the method for preparing the gray soil by using the shield residue soil can recycle the shield residue soil generated in the subway tunnel construction process to produce the gray soil material which meets the requirements of building construction, and can recycle the resources while reducing the influence of the shield residue soil on the environment, so that the method is more environment-friendly;
the method for preparing the gray soil by using the shield slag soil provided by the invention can be used for purifying the foaming agent contained in the obtained shield slag soil and organic matters and the like which are not completely decomposed in the shield slag soil, so that the quality of the prepared gray soil is improved.
Drawings
Fig. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
Example 1
As shown in fig. 1, the method for preparing the gray soil by using the shield slag soil provided by the invention comprises the following specific steps:
s1, adding a defoaming agent into the obtained shield slag soil slurry to obtain a mixture A;
s2, conveying the mixture A to a centrifugal machine for dehydration to obtain a solid mixture B and wastewater C;
s3, calcining the solid mixture B in a high-temperature environment, and cooling to obtain a solid mixture D;
sequentially performing flocculation precipitation and adsorption treatment on the wastewater C to obtain liquid E;
s4, uniformly mixing the solid mixture D and the powder modifier to obtain a mixture F; adding liquid E to mixture F to obtain a viscous mixture G;
s5, stacking the mixture G and naturally airing to obtain a mixture H;
s6, crushing and grinding the mixture H, and sieving to obtain a gray soil finished product with the required particle size.
Example two
As shown in fig. 1, the method for preparing the gray soil by using the shield slag soil provided by the invention comprises the following specific steps:
s1, adding a defoaming agent into the obtained shield slag soil slurry to obtain a mixture A;
s2, conveying the mixture A to a centrifugal machine for dehydration to obtain a solid mixture B and wastewater C; the deodorant is added in the process of centrifugally dewatering the mixture A, so that the influence of malodor emitted in the process of treating the mixture on the health of workers is avoided, and the environment pollution caused by the malodor can be avoided;
s3, calcining the solid mixture B in a high-temperature environment, and cooling to obtain a solid mixture D;
sequentially performing flocculation precipitation and adsorption treatment on the wastewater C to obtain liquid E;
s4, uniformly mixing the solid mixture D and the powder modifier to obtain a mixture F; adding liquid E to mixture F to obtain a viscous mixture G;
s5, stacking the mixture G and naturally airing to obtain a mixture H;
s6, crushing and grinding the mixture H, and sieving to obtain a gray soil finished product with the required particle size.
Example III
Compared with the first embodiment, the process of adsorbing the wastewater C in the embodiment S3 is as follows: the wastewater after flocculation precipitation sequentially passes through the quartz particle layer, the biochemical ball layer and the activated carbon layer to obtain liquid E, and after flocculation precipitation, the wastewater is subjected to adsorption treatment of the quartz particle layer, the biochemical ball layer and the activated carbon layer to obtain available water resources, wherein the water resources can be used for urban watering, greening irrigation and subsequent gray soil production, the treated water resources are used for gray soil production, the use of drinking water resources can be reduced, and meanwhile, the cost investment in gray soil production by using the existing water resources is reduced.
Example IV
Compared with the first embodiment, the method for preparing the gray soil by using the shield slag soil provided by the invention has the following steps of:
s31, heating the solid mixture B, raising the temperature to 80 ℃ within 20-30 min, and preserving the heat for 10-20 min;
s32, continuing to heat, raising the temperature to 105 ℃ within 8-10 min, preserving heat for 10-15 min, and collecting the gas exhausted from the beginning of heating until the end of heat preservation to obtain gas a;
s33, continuing to heat, raising the temperature to 180 ℃ within 8-10 min, preserving heat for 10-15 min, and collecting the gas exhausted from the beginning of heating until the end of heat preservation to obtain gas b;
s34, continuously heating, raising the temperature to 290 ℃ within 8-10 min, preserving heat for 10-15 min, and collecting the gas exhausted from the beginning of heating until the end of heat preservation to obtain gas c;
s35, continuously heating, raising the temperature to 400 ℃ within 8-10 min, preserving heat for 10-15 min, and collecting the gas exhausted from the beginning of heating until the end of heat preservation to obtain gas d;
s36, cooling the high-temperature solid mixture in S35 to obtain a solid mixture D, and condensing and collecting the obtained gas a, gas b, gas c and gas D;
the solid mixture B is heated stepwise, so that organic matters in the solid mixture B can be effectively removed, and the obtained gas is condensed to recover the organic matters with different components.
Example five
As shown in fig. 1, the method for preparing the gray soil by using the shield slag soil provided by the invention comprises the following specific steps:
s1, adding a defoaming agent into the obtained shield slag soil slurry to obtain a mixture A;
s2, conveying the mixture A to a centrifugal machine for dehydration to obtain a solid mixture B and wastewater C;
s3, calcining the solid mixture B in a high-temperature environment, and cooling to obtain a solid mixture D;
sequentially performing flocculation precipitation and adsorption treatment on the wastewater C to obtain liquid E;
s4, uniformly mixing the solid mixture D and the powder modifier to obtain a mixture F; adding liquid E to mixture F to obtain a viscous mixture G;
the addition amounts of the solid mixture D and the powder modifier are as follows: adding 0.03-0.05 part of powder modifier into every 100 parts of solid mixture D; the powder modifier comprises lime, cement, talcum powder, sodium carbonate, sodium alginate and lithium hydroxide;
the powder modifier comprises the following components in parts by weight: 80-100 parts of lime, 20-35 parts of cement, 4-6 parts of talcum powder, 3-6 parts of sodium carbonate, 2-5 parts of sodium alginate and 1-4 parts of lithium hydroxide;
s5, stacking the mixture G and naturally airing to obtain a mixture H;
s6, crushing and grinding the mixture H, and sieving to obtain a gray soil finished product with the required particle size.
Example six
Compared with the fifth embodiment, in the method for preparing the gray soil by using the shield residue soil, in the embodiment S5, the mixture G is stacked in the storage pool, and the dust suppression net is covered on the surface of the mixture G until the water content of the bottom layer of the mixture G is lower than 5%, so that the mixture H is obtained.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (4)
1. The method for preparing the gray soil by using the shield slag soil is characterized by comprising the following specific steps of:
s1, adding a defoaming agent into the obtained shield slag soil slurry to obtain a mixture A;
s2, conveying the mixture A to a centrifugal machine for dehydration to obtain a solid mixture B and wastewater C;
s3, calcining the solid mixture B in a high-temperature environment, and cooling to obtain a solid mixture D;
sequentially performing flocculation precipitation and adsorption treatment on the wastewater C to obtain liquid E;
the process of the adsorption treatment of the wastewater C comprises the following steps: sequentially passing the flocculated and precipitated wastewater through a quartz particle layer, a biochemical ball layer and an active carbon layer to obtain liquid E;
the high temperature calcination process of the solid mixture B is as follows:
s31, heating the solid mixture B, raising the temperature to 80 ℃ within 20-30 min, and preserving the heat for 10-20 min;
s32, continuing to heat, raising the temperature to 105 ℃ within 8-10 min, preserving heat for 10-15 min, and collecting the gas exhausted from the beginning of heating until the end of heat preservation to obtain gas a;
s33, continuing to heat, raising the temperature to 180 ℃ within 8-10 min, preserving heat for 10-15 min, and collecting the gas exhausted from the beginning of heating until the end of heat preservation to obtain gas b;
s34, continuously heating, raising the temperature to 290 ℃ within 8-10 min, preserving heat for 10-15 min, and collecting the gas exhausted from the beginning of heating until the end of heat preservation to obtain gas c;
s35, continuously heating, raising the temperature to 400 ℃ within 8-10 min, preserving heat for 10-15 min, and collecting the gas exhausted from the beginning of heating until the end of heat preservation to obtain gas d;
s36, cooling the high-temperature solid mixture in S35 to obtain a solid mixture D, and condensing and collecting the obtained gas a, gas b, gas c and gas D;
s4, uniformly mixing the solid mixture D and the powder modifier to obtain a mixture F; adding liquid E to mixture F to obtain a viscous mixture G; the addition amounts of the solid mixture D and the powder modifier are as follows: adding 0.03-0.05 part of powder modifier into every 100 parts of solid mixture D; the powder modifier comprises lime, cement, talcum powder, sodium carbonate, sodium alginate and lithium hydroxide;
s5, stacking the mixture G and naturally airing to obtain a mixture H;
s6, crushing and grinding the mixture H, and sieving to obtain a gray soil finished product with the required particle size.
2. The method for preparing gray soil by using shield slag according to claim 1, wherein the deodorant is added during the centrifugal dehydration of the mixture a in S2.
3. The method for preparing the gray soil by using the shield slag soil according to claim 1, wherein the powder modifier comprises the following components in parts by weight: 80-100 parts of lime, 20-35 parts of cement, 4-6 parts of talcum powder, 3-6 parts of sodium carbonate, 2-5 parts of sodium alginate and 1-4 parts of lithium hydroxide.
4. The method for preparing the gray soil by using the shield residue soil according to claim 1, wherein in the step S5, the mixture G is piled up in a storage tank, and a dust suppression net is covered on the surface of the mixture G until the water content of a bottom layer of the mixture G is lower than 5%, so as to obtain a mixture H.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211276182.6A CN115636630B (en) | 2022-10-19 | 2022-10-19 | Method for preparing gray soil by using shield slag soil |
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| CN202211276182.6A CN115636630B (en) | 2022-10-19 | 2022-10-19 | Method for preparing gray soil by using shield slag soil |
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| CN115636630A CN115636630A (en) | 2023-01-24 |
| CN115636630B true CN115636630B (en) | 2023-07-18 |
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| JP6084745B1 (en) * | 2016-09-07 | 2017-02-22 | 太平洋セメント株式会社 | Disposal method of mud generated by muddy water type shield method |
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| CN212669483U (en) * | 2020-06-15 | 2021-03-09 | 昆山皖源环境技术有限公司 | Waste water treatment device with deodorization purification structure |
| CN113182328A (en) * | 2021-05-20 | 2021-07-30 | 兰方环保工程(南京)有限公司 | Shield muck resource improvement process method |
| CN113548785A (en) * | 2021-08-06 | 2021-10-26 | 天津森焱环保设备制造有限公司 | Processing system applied to shield slurry and separation method thereof |
| CN114853415A (en) * | 2022-04-28 | 2022-08-05 | 中交疏浚技术装备国家工程研究中心有限公司 | Method for preparing baking-free pressed brick by using ball milling activated shield slurry and product thereof |
| CN115196939A (en) * | 2022-08-17 | 2022-10-18 | 徐州中矿岩土技术股份有限公司 | Soft soil curing agent and modified soil material for surface layer of shield muck accumulation area and preparation method thereof |
-
2022
- 2022-10-19 CN CN202211276182.6A patent/CN115636630B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6084745B1 (en) * | 2016-09-07 | 2017-02-22 | 太平洋セメント株式会社 | Disposal method of mud generated by muddy water type shield method |
| CN210975417U (en) * | 2019-08-26 | 2020-07-10 | 江苏华辰园林工程有限公司 | Sponge urban pavement structure of permeating water |
| CN212669483U (en) * | 2020-06-15 | 2021-03-09 | 昆山皖源环境技术有限公司 | Waste water treatment device with deodorization purification structure |
| CN113182328A (en) * | 2021-05-20 | 2021-07-30 | 兰方环保工程(南京)有限公司 | Shield muck resource improvement process method |
| CN113548785A (en) * | 2021-08-06 | 2021-10-26 | 天津森焱环保设备制造有限公司 | Processing system applied to shield slurry and separation method thereof |
| CN114853415A (en) * | 2022-04-28 | 2022-08-05 | 中交疏浚技术装备国家工程研究中心有限公司 | Method for preparing baking-free pressed brick by using ball milling activated shield slurry and product thereof |
| CN115196939A (en) * | 2022-08-17 | 2022-10-18 | 徐州中矿岩土技术股份有限公司 | Soft soil curing agent and modified soil material for surface layer of shield muck accumulation area and preparation method thereof |
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