CN115367976A - Double-salt curing agent and resource regeneration process of waste slurry - Google Patents
Double-salt curing agent and resource regeneration process of waste slurry Download PDFInfo
- Publication number
- CN115367976A CN115367976A CN202211162895.XA CN202211162895A CN115367976A CN 115367976 A CN115367976 A CN 115367976A CN 202211162895 A CN202211162895 A CN 202211162895A CN 115367976 A CN115367976 A CN 115367976A
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- Prior art keywords
- double
- curing agent
- salt curing
- lime
- waste slurry
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- 239000002699 waste material Substances 0.000 title claims abstract description 34
- 239000002002 slurry Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000008929 regeneration Effects 0.000 title abstract description 8
- 238000011069 regeneration method Methods 0.000 title abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 27
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 21
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 21
- 239000004571 lime Substances 0.000 claims abstract description 21
- 238000003825 pressing Methods 0.000 claims abstract description 19
- 239000010881 fly ash Substances 0.000 claims abstract description 16
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 15
- 239000010440 gypsum Substances 0.000 claims abstract description 15
- 238000012423 maintenance Methods 0.000 claims abstract description 15
- 239000012467 final product Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 239000000701 coagulant Substances 0.000 claims description 7
- 238000004064 recycling Methods 0.000 claims description 7
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000010802 sludge Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 238000011049 filling Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 239000002893 slag Substances 0.000 abstract description 3
- 239000000945 filler Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000011085 pressure filtration Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical class [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a double-salt curing agent and a resource regeneration process of waste slurry, which comprises the following steps: collecting and primarily settling waste slurry; adding a double-salt curing agent and stirring; filter-pressing and dehydrating to generate mud cakes, and recovering water generated by filter-pressing; carrying out dry maintenance on the mud cakes, spraying and maintaining water generated by filter pressing after the mud cakes preliminarily form strength, and forming a final product after the maintenance is finished; the invention has the advantages that: based on the double-salt curing agent, mud cakes can be formed at one time, and do not need to be crushed and mixed with lime for curing at a later stage, so that the treatment flow of waste mud is simplified; the final product is a hydraulic material, is used for the slag (roadbed filling) and is not influenced by rainy days, and is suitable for popularization and use; as the fly ash, lime and gypsum in the double-salt curing agent only utilize the chemical properties of the fly ash, lime and gypsum, and the final product is only used as roadbed filler, the raw materials of the double-salt curing agent have no high grade requirement, so that the raw materials have good price advantage and convenience in purchase.
Description
Technical Field
The invention relates to the technical field of waste slurry treatment, in particular to a double-salt curing agent and a resource regeneration process of waste slurry.
Background
The existing treatment of waste slurry has several ways, one is: filter pressing and solidifying into cakes, and then performing landfill treatment on the mud cakes, but the mode has the defect of high landfill cost and can affect the environment; the second method comprises the following steps: as shown in figure 1, the mud is subjected to pressure filtration and dehydration to form mud cakes in the first stage, and as shown in figure 2, the mud dehydrated soil (namely the mud cakes) is crushed and mixed with a curing agent for improvement in the second stage, so that resource utilization is finally realized. However, the second method has the following disadvantages: 1. the final product belongs to an air-hardening material, so that the construction in rainy days is easy to hydrate, and the water content in the construction in sunny days is not easy to control; 2. the industry is difficult to be large, so that a large amount of products are easily stacked in a field, and no economic benefit is brought; 3. the waste slurry generally contains more than 60 percent of water, while the water obtained by the conventional slurry press filtration is not generally treated, and the press filtration water contains components such as lime, a coagulant and the like, and is discharged into a river channel, so that the environmental load is increased.
On the other hand, because the social environmental protection control is strict at present, the mode that the roadbed filling adopts mountain-opening materials is not practical, so that the roadbed filling price is increased greatly.
Based on this, the present application is thus proposed.
Disclosure of Invention
The invention aims to provide a double-salt curing agent and a resource regeneration process of waste slurry, so as to improve the performance of the waste slurry and optimize the treatment process of the waste slurry.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a double-salt curing agent comprises the following components by weight: 0.7 percent of coagulant, 62 to 66 percent of fly ash, 22 percent of lime and 11 to 14 percent of gypsum.
Further, the coagulant comprises polyacrylamide.
A resource regeneration process of waste slurry based on a double-salt curing agent comprises the following steps:
s1, collecting and primarily settling waste slurry;
s2, adding a double-salt curing agent for stirring;
s3, filter pressing and dehydrating to generate mud cakes, and recovering water generated by filter pressing;
and S4, carrying out dry maintenance on the mud cakes, after the strength is preliminarily formed, spraying and maintaining water generated by filter pressing, and forming a final product after the maintenance is finished.
Further, step S3 requires pressure filtration at a pressure of 1.2MPA for 40-60 minutes.
The invention has the advantages that: 1. based on the double-salt curing agent, mud cakes can be formed at one time, and later-stage crushing and mixing of lime for curing are not needed, so that the treatment flow of waste mud is simplified; 2. the final product is a hydraulic material, is used for the slag (roadbed filling) and is not influenced by rainy days, and is suitable for popularization and use; 3. as the fly ash, lime and gypsum in the double-salt curing agent only utilize the chemical properties of the fly ash, lime and gypsum, and the final product is only used as roadbed filler, the raw materials of the double-salt curing agent have no high grade requirement, so that the raw materials have good price advantage and convenience in purchase.
Drawings
FIG. 1 is a schematic representation of a prior art process for dewatering a slurry to form a mud cake;
FIG. 2 is a schematic flow diagram of a prior art process for pulverizing and blending a slurry;
FIG. 3 is a schematic flow chart of a resource regeneration process of the waste slurry in the embodiment;
FIG. 4 shows a resource recycling system for waste slurry compatible with the recycling process of the example.
Detailed Description
The present invention will be described in further detail with reference to examples.
The present embodiment provides a recycling regeneration process of waste slurry, as shown in fig. 3, including the following steps: s1, collecting and primarily settling waste slurry;
s2, preparing a double-salt curing agent according to the weight of dry mud of the waste mud, wherein the proportion of the double-salt curing agent is 26.0-28.5%, and the proportion of the waste mud is 71.5-74%, and uniformly stirring the double-salt curing agent and the waste mud;
s3, pumping into a filter press for filter pressing, wherein the filter pressing is carried out for 40-60 minutes in the environment with the pressure of 1.2MPA, and tail water generated by the filter pressing is recovered;
and S4, carrying out dry maintenance on the mud cakes formed by filter pressing, after the mud cakes preliminarily form strength, spraying water generated by filter pressing for maintenance, forming a hydraulic material similar to slag after the maintenance is finished, wherein the water generated by filter pressing contains lime or a coagulant and other components, the maintenance effect is better than that of clear water maintenance, and the redundant tail water is subjected to pipe storage and discharge.
The double-salt curing agent adopted by the embodiment comprises the following components in parts by weight: 0.7 percent of polyacrylamide, 62 to 66 percent of fly ash, 22 percent of lime and 11 to 14 percent of gypsum. Wherein, the polyacrylamide is a macromolecule sewage treatment agent, plays a role of a coagulant and is suitable for a strong alkaline environment (tests show that the mud containing saturated lime water is also suitable for the embodiment). Lime and gypsum are only used as an excitant of the fly ash (calcium ions and fly ash are subjected to volcanic ash reaction, and the generated molecular crystal can form a layer of hydrophobic film structure at the periphery of a soil particle group and along the direction of a free water gap, so that the particle pores are filled with the molecular crystal, and the particle density is improved by certain expansion performance), so that the specific gravity of the fly ash in the double-salt curing agent is the largest, and the gypsum and the lime are used as the excitant for the following reasons: 1. the fly ash in China is low-calcium ash mostly, and the formation of the strength of a final product needs to supplement enough calcium ions, so that the lime and the gypsum are used as the excitant of the fly ash economically reasonably, and the lime and the gypsum are cheap, so the lime occupies more gypsum; 2. the lime, the fly ash and the waste soil form the lime-fly ash with low early strength, the gypsum is adopted to replace part of the lime, the early strength can be improved, the gypsum and the lime react with the fly ash together, so that the activity of the fly ash is effectively excited, the transfer and stacking of mud cakes are facilitated, and the mud cakes are prevented from being scattered by heavy rain or curing water in the curing process; 3. gypsum and Ca (OH) 2 (lime and water products) are not easy to dissolve in water, so most of the lime and water products can be left in the mud cakes, and waste is avoided.
As shown in fig. 4, the present embodiment further provides a resource recycling system matched with the resource recycling process for waste slurry, which sequentially includes a slurry tank, a primary settling tank, a stirring room, a chemical room, a mud-water separation system, a tail water tank, a tail water discharge area, a maintenance area and a finished product area, wherein the slurry tank is used for collecting the waste slurry, the primary settling tank is used for primarily settling the waste slurry pumped from the slurry tank, the primarily settled waste slurry is pumped into the stirring room, the chemical room is used for pumping a corresponding amount of double salt curing agent according to the dry mud weight of the waste slurry pumped into the stirring room, and the stirring room is used for stirring and mixing the waste slurry and the curing agent, and then inputting the mixture into the mud-water separation system. The mud-water separation system needs to be provided with corresponding parameters, the filter press is controlled to filter and press the waste slurry, mud cakes generated by filter pressing are input into the maintenance area, tail water generated by filter pressing is input into the tail water pool, the tail water discharge area and the maintenance area are communicated through pipelines, and finished products after maintenance are placed in the finished product area and can be transported to a construction site at any time.
The above-described embodiments are merely illustrative of the principles of the present invention and are not intended to limit the scope of the invention, which is defined by the claims.
Claims (4)
1. The double-salt curing agent is characterized by comprising the following components in parts by weight: 0.7 percent of coagulant, 62 to 66 percent of fly ash, 22 percent of lime and 11 to 14 percent of gypsum.
2. The double salt curing agent of claim 1, wherein: the coagulant comprises polyacrylamide.
3. A process for recycling waste slurry based on the double-salt curing agent of claim 1 or 2, which comprises the following steps:
s1, collecting and primarily settling waste slurry;
s2, adding a double-salt curing agent for stirring;
s3, filter pressing and dehydrating to generate mud cakes, and recovering water generated by filter pressing;
and S4, carrying out dry maintenance on the mud cakes, after the strength is preliminarily formed, spraying and maintaining water generated by filter pressing, and forming a final product after the maintenance is finished.
4. A process according to claim 3 for the recycling of waste sludge, wherein: step S3 requires filter pressing for 40-60 minutes under the environment of 1.2MPA pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211162895.XA CN115367976A (en) | 2022-09-23 | 2022-09-23 | Double-salt curing agent and resource regeneration process of waste slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211162895.XA CN115367976A (en) | 2022-09-23 | 2022-09-23 | Double-salt curing agent and resource regeneration process of waste slurry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115367976A true CN115367976A (en) | 2022-11-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211162895.XA Pending CN115367976A (en) | 2022-09-23 | 2022-09-23 | Double-salt curing agent and resource regeneration process of waste slurry |
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| Country | Link |
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| CN (1) | CN115367976A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001200686A (en) * | 2000-01-20 | 2001-07-27 | Sumitomo Osaka Cement Co Ltd | Slurry hardening method |
| CN106278095A (en) * | 2016-08-11 | 2017-01-04 | 洛阳名力科技开发有限公司 | A kind of soil-solidified-agent |
| CN111302589A (en) * | 2020-04-22 | 2020-06-19 | 南京环境集团有限公司 | Efficient dewatering method for urban construction waste slurry |
| CN111943620A (en) * | 2020-07-17 | 2020-11-17 | 福建建工建材科技开发有限公司 | Slurry curing agent and application thereof |
| CN112030639A (en) * | 2020-08-17 | 2020-12-04 | 钱红梁 | Method for obtaining hydraulic roadbed filler by filter pressing and curing of slurry or tailings |
-
2022
- 2022-09-23 CN CN202211162895.XA patent/CN115367976A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001200686A (en) * | 2000-01-20 | 2001-07-27 | Sumitomo Osaka Cement Co Ltd | Slurry hardening method |
| CN106278095A (en) * | 2016-08-11 | 2017-01-04 | 洛阳名力科技开发有限公司 | A kind of soil-solidified-agent |
| CN111302589A (en) * | 2020-04-22 | 2020-06-19 | 南京环境集团有限公司 | Efficient dewatering method for urban construction waste slurry |
| CN111943620A (en) * | 2020-07-17 | 2020-11-17 | 福建建工建材科技开发有限公司 | Slurry curing agent and application thereof |
| CN112030639A (en) * | 2020-08-17 | 2020-12-04 | 钱红梁 | Method for obtaining hydraulic roadbed filler by filter pressing and curing of slurry or tailings |
Non-Patent Citations (1)
| Title |
|---|
| 乌效鸣等: "《钻井液与岩土工程浆液》", 中国地质大学出版社, pages: 243 * |
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