CN113060955A - Method for preparing artificial volcanic ash by using sludge and construction waste - Google Patents
Method for preparing artificial volcanic ash by using sludge and construction waste Download PDFInfo
- Publication number
- CN113060955A CN113060955A CN202110302843.7A CN202110302843A CN113060955A CN 113060955 A CN113060955 A CN 113060955A CN 202110302843 A CN202110302843 A CN 202110302843A CN 113060955 A CN113060955 A CN 113060955A
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- sludge
- volcanic ash
- artificial
- construction waste
- preparing
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- 239000010802 sludge Substances 0.000 title claims abstract description 67
- 238000010276 construction Methods 0.000 title claims abstract description 33
- 239000002699 waste material Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 28
- 239000002893 slag Substances 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 19
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical group [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- 239000000292 calcium oxide Substances 0.000 claims description 8
- 235000012255 calcium oxide Nutrition 0.000 claims description 8
- 239000012024 dehydrating agents Substances 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 239000007800 oxidant agent Substances 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 7
- 238000007689 inspection Methods 0.000 abstract description 2
- 239000002956 ash Substances 0.000 description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 239000011449 brick Substances 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 4
- 239000000920 calcium hydroxide Substances 0.000 description 4
- 235000011116 calcium hydroxide Nutrition 0.000 description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 4
- 210000004027 cell Anatomy 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000010811 mineral waste Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 238000011197 physicochemical method Methods 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
-
- 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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention provides a method for preparing artificial volcanic ash by utilizing sludge and construction waste, which comprises the following steps of separating bound water and cell water in the sludge by sludge pretreatment, adding the construction waste and ironmaking slag powder to further reduce the water content, and performing quality inspection on the prepared artificial volcanic ash, wherein all indexes of the prepared artificial volcanic ash meet the standard requirements of volcanic ash mixed materials used in cement.
Description
Technical Field
The invention belongs to the technical field of building engineering materials, relates to a preparation method of artificial volcanic ash, and particularly relates to a method for preparing artificial volcanic ash by utilizing sludge and construction waste.
Background
Sludge is a general term for precipitates, particles and floating materials generated when wastewater is treated by physical, chemical, physicochemical and biological methods. The sludge contains a large amount of toxic and harmful substances such as organic matters, pathogens, heavy metals and the like, and the sludge occupies huge volume due to the characteristic of extremely high water content. The inherent characteristics of sludge cause sludge particles to form a network structure near the filter medium, thus preventing the sludge from settling and compressing, while the increasingly developed water treatment technology causes the sludge to be complicated, so that the sludge dewatering reduction is more difficult.
In engineering construction, most of construction wastes are transported to suburbs or villages without any treatment, and are stacked or buried in the open air, so that a large amount of construction expenses such as land charge for collection, garbage clearing and transporting cost and the like are consumed, and meanwhile, the problems of scattering, dust, sand and the like in the clearing, transporting and stacking processes cause serious environmental pollution.
At present, the effective dehydration can be carried out only by adopting calcination or chemical conditioning measures to improve the dehydration performance of the sludge in the dehydration of the sludge. Although the calcined sludge has high dehydration efficiency, the calcined sludge is easy to cause secondary pollution, generates a large amount of waste gas and has low activity after calcination. One of the more common chemical conditioning methods is to add a coagulant or flocculant (such as lime, polyaluminium chloride and polyacrylamide), and the other is to add an inert coagulant aid (such as pulverized coal furnace fly ash). However, the above conditioning method has a significant improvement effect only on the removal of free water, and is insufficient for the removal of cellular water and bound water. Therefore, by adding the conditioner and then mechanically dehydrating, the water content of the dehydrated sludge is 70% to 85%, and it is difficult to further reduce the water content.
In the prior art, the sludge is mixed with other construction waste or mineral waste to prepare the construction material, so that the aim of recycling is fulfilled. For example, patent CN102826797A discloses a building material composition containing sludge and construction waste, which is prepared by mixing sludge with an activator and industrial waste residue to obtain a building material such as bricks, and has high compressive strength. Patent CN108328981A discloses a method for preparing a sintering-free self-insulation brick by using sludge, mineralized refuse and construction waste, and specifically, the method comprises the steps of mixing and activating modified sludge and sea shell ash to obtain activated sludge, then carrying out wheel milling mixing on the activated sludge, the sea shell ash, fly ash, mineralized refuse, construction waste, clay, F14 excitant and water, and mixing with other auxiliary materials to prepare the self-insulation brick. In addition, in many patent documents, sludge and other construction wastes are mixed to prepare bricks so as to achieve the purpose of recycling the sludge and the wastes, but in order to enable the prepared products to have better performance, other auxiliary agents are mostly required to be added, so that the preparation process is complex and the cost is high.
The artificial volcanic ash is prepared by mixing the treated sludge with the construction waste powder and the iron-making slag powder through independent research, development and innovation, can be used for preparing the construction cement, and has simple process and easy operation. At present, the volcanic ash with low water content is prepared by activated sludge of a sewage plant in no technology because the water content of the volcanic ash cannot be too high, and if the water content of the volcanic ash is high, the volcanic ash cannot be easily ground into powder and can easily react with cement clinker.
Disclosure of Invention
The invention aims to recycle sludge, construction waste and mineralized waste to prepare the artificial volcanic ash commonly used in construction.
Based on the above purpose, the invention provides a method for preparing artificial volcanic ash by using sludge and construction waste, and particularly, the artificial volcanic ash mainly comprises the sludge, construction waste powder and ironmaking slag powder.
Further, the mass ratio of the sludge, the construction waste powder and the ironmaking slag powder in the artificial volcanic ash is 20-35: 30-50: 15-30.
The invention also provides a preparation method of the artificial volcanic ash, which comprises the following steps:
pretreating sludge;
mixing the sludge and the construction waste powder to obtain a mixture A;
mixing the mixture A with ironmaking slag powder to obtain a mixture B;
and grinding the mixture B, and screening to obtain the artificial volcanic ash.
Further, when the mixture B was ground, the grinding temperature was 100 ℃ and the grinding time was 15 min.
Wherein the sludge pretreatment comprises the following steps:
adding an oxidant to oxidize organic matters in the sludge into inorganic matters;
adding a dehydrating agent to remove cell water and bound water in the sludge;
and carrying out mud-water separation to obtain pretreated sludge.
Further, the adding mass of the oxidant is 1-5% of the mass of the sludge.
Further, the adding mass of the dehydrating agent is 10-20% of the mass of the sludge.
Further, the oxidant is selected from one of hydrogen peroxide or sodium hypochlorite.
Further, the dehydrating agent is quicklime.
The method for preparing the artificial volcanic ash is applied to manufacturing of volcanic ash cement.
Compared with the prior art, the invention has the following beneficial effects or advantages:
the invention provides a method for preparing artificial volcanic ash by utilizing sludge and construction waste, which comprises the following steps of separating bound water and cell water in the sludge by sludge pretreatment, adding the construction waste and ironmaking slag powder to further reduce the water content, and testing the quality of the prepared artificial volcanic ash, wherein all indexes of the prepared artificial volcanic ash meet the standard requirements of volcanic ash mixed materials used in cement.
Detailed Description
The present invention will be further explained with reference to specific embodiments, but the present invention is not limited to the embodiments described below.
A method for preparing artificial volcanic ash by utilizing sludge and construction waste comprises the raw material components of activated sludge of sewage plants, construction waste powder (namely used cement fine powder and red brick fine powder which mainly contain silicon dioxide, aluminum oxide, ferric oxide, calcium hydroxide and silicic acid and have the fineness of 5-10mm), ironmaking slag powder (mainly containing silicon dioxide, aluminum oxide, ferric oxide and calcium oxide, wherein the specific contents of the substances are different from those of the construction waste powder), hydrogen peroxide or sodium hypochlorite and quicklime.
The preparation method comprises the following specific steps:
step one, sludge pretreatment: taking 100kg of activated sludge (the water content is about 85%) of a sewage plant, firstly adding 1-5 kg of hydrogen peroxide or sodium hypochlorite to oxidize organic matters in the sludge into inorganic matters, then adding 10-20 kg of quick lime, fully mixing, standing for 3-5 h, and then carrying out mud-water separation to obtain pretreated sludge.
The quicklime can react with free water in the sludge to generate hydrated lime (calcium hydroxide), can kill microorganisms in the sludge to break cell membranes and release water in cells, and can react with the cell water to generate the hydrated lime.
And step two, mixing the pretreated sludge and 85-250 kg of construction waste powder, stirring for 1 hour, and standing for 8 hours to obtain a mixture A. The silicon dioxide, the aluminum oxide and the ferric oxide contained in the construction waste powder can increase the volcanic ash activity of the mixture, and the calcium oxide contained in the construction waste powder can also continuously absorb water to the sludge.
And step three, mixing the mixture A with 42-150 kg of ironmaking slag powder, stirring for 10-20 min, and standing for 6h to obtain a mixture B. The silicon dioxide, the aluminum oxide and the ferric oxide contained in the ironmaking slag powder can increase the volcanic ash activity of the mixture, and the calcium oxide contained in the ironmaking slag powder can also continuously absorb water to the sludge.
And step four, grinding the mixture B in a ball mill for 15min at 100 ℃, then putting the mixture into a 800-mesh screen, and grinding the mixture to 800 meshes or below to prepare the artificial volcanic ash with the water content of 2%.
The artificial volcanic ash prepared by the method is sent to a quality supervision and inspection station for decoration and finishing materials in Shaanxi province for quality detection, and the detection result is shown in Table 1 according to GB/T2847-2005 volcanic ash mixed materials for cement.
TABLE 1 report of artificial pozzolan test results
The detection results in table 1 show that all indexes of the sample meet the requirements of GB/T2847-2005 standard, and the sample is comprehensively judged to be qualified.
As described above, the present invention can be preferably implemented, and the above-mentioned embodiments are merely descriptions of preferred embodiments of the present invention, and do not limit the scope of the present invention, and various changes and modifications made to the technical scheme of the present invention by those skilled in the art without departing from the design spirit of the present invention should fall within the protection scope defined by the present invention.
Claims (10)
1. The method for preparing the artificial volcanic ash by using the sludge and the construction waste is characterized in that the main components of the artificial volcanic ash comprise the sludge, the construction waste powder and the ironmaking slag powder.
2. The method for preparing the artificial volcanic ash according to claim 1, wherein the mass ratio of the sludge, the construction waste powder and the ironmaking slag powder in the artificial volcanic ash is 20-35: 30-50: 15-30 in parts by mass.
3. The method of producing an artificial pozzolan according to claim 1, comprising the steps of,
pretreating sludge;
mixing the sludge and the construction waste powder to obtain a mixture A;
mixing the mixture A with ironmaking slag powder to obtain a mixture B;
and grinding the mixture B, and screening to obtain the artificial volcanic ash.
4. The method of claim 3, wherein the mixture B is ground at 100 ℃ for 15 min.
5. The method for preparing artificial pozzolan according to claim 3, wherein the sludge pretreatment comprises the steps of,
adding an oxidant to oxidize organic matters in the sludge into inorganic matters;
adding a dehydrating agent to remove cell water and bound water in the sludge;
and carrying out mud-water separation to obtain pretreated sludge.
6. The method for preparing the artificial volcanic ash as claimed in claim 5, wherein the mass of the added oxidant is 1-5% of the mass of the sludge.
7. The method for preparing the artificial volcanic ash as claimed in claim 5, wherein the mass of the dehydrating agent added is 10-20% of the mass of the sludge.
8. The method for preparing the artificial volcanic ash as claimed in claim 5, wherein the oxidant is selected from one of hydrogen peroxide and sodium hypochlorite.
9. The method of preparing an artificial pozzolan of claim 5, wherein the dehydrating agent is quicklime.
10. Use of a method of making an artificial pozzolan according to any one of claims 1 to 9 in the manufacture of a pozzolan cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110302843.7A CN113060955A (en) | 2021-03-22 | 2021-03-22 | Method for preparing artificial volcanic ash by using sludge and construction waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110302843.7A CN113060955A (en) | 2021-03-22 | 2021-03-22 | Method for preparing artificial volcanic ash by using sludge and construction waste |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113060955A true CN113060955A (en) | 2021-07-02 |
Family
ID=76563203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110302843.7A Pending CN113060955A (en) | 2021-03-22 | 2021-03-22 | Method for preparing artificial volcanic ash by using sludge and construction waste |
Country Status (1)
| Country | Link |
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| CN (1) | CN113060955A (en) |
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|---|---|---|---|---|
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Application publication date: 20210702 |