CN117049808A - Low-cost and environment-friendly stone sawing mud recycled aggregate, preparation method and application - Google Patents
Low-cost and environment-friendly stone sawing mud recycled aggregate, preparation method and application Download PDFInfo
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- CN117049808A CN117049808A CN202310877359.6A CN202310877359A CN117049808A CN 117049808 A CN117049808 A CN 117049808A CN 202310877359 A CN202310877359 A CN 202310877359A CN 117049808 A CN117049808 A CN 117049808A
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- Prior art keywords
- stone sawing
- mud
- sawing mud
- recycled aggregate
- stone
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- 239000004575 stone Substances 0.000 title claims abstract description 88
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 30
- 239000004568 cement Substances 0.000 claims abstract description 28
- 239000002893 slag Substances 0.000 claims abstract description 24
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 23
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 23
- 239000004571 lime Substances 0.000 claims abstract description 23
- 239000000654 additive Substances 0.000 claims abstract description 22
- 230000000996 additive effect Effects 0.000 claims abstract description 21
- 238000001723 curing Methods 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 239000002440 industrial waste Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 5
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 239000011574 phosphorus Substances 0.000 claims description 5
- 238000011085 pressure filtration Methods 0.000 claims 1
- 230000008929 regeneration Effects 0.000 claims 1
- 238000011069 regeneration method Methods 0.000 claims 1
- 239000002910 solid waste Substances 0.000 abstract description 7
- 239000004567 concrete Substances 0.000 abstract description 5
- 238000001035 drying Methods 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000227 grinding Methods 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 description 10
- 238000002156 mixing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000002173 cutting fluid Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000005498 polishing Methods 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
Abstract
The application discloses a low-cost and environment-friendly recycled aggregate prepared from stone saw mud and a preparation method thereof, and belongs to the field of building materials. The preparation raw materials mainly comprise stone sawing mud, carbide slag or lime, phosphogypsum, cement and additives, and the weight percentages of the raw materials are as follows: 50-80% of stone sawing mud, 0-30% of carbide slag or 0-20% of lime, 2-5% of phosphogypsum, 0-20% of cement and 0-0.5% of additive. Adopting an autoclave curing method. The compressive strength of the prepared recycled aggregate can reach 30-70 MPa. The utilization rate of the regenerated aggregate solid waste prepared by the method can reach 100%, the main solid waste does not need grinding and drying, the production cost is reduced, and the problems of treatment of waste residues in the stone industry, carbide slag and phosphogypsum in the chemical industry and shortage of concrete aggregate resources are solved.
Description
Technical Field
The application belongs to the field of building materials, and particularly relates to a low-cost and environment-friendly stone sawing mud recycled aggregate and a preparation method thereof.
Background
Along with the rapid development of the economy in China, the environmental protection is also important. The stone sawing mud is a mud-like solid waste formed by the steps of mining natural granite blank stone, conveying the stone blank stone to a stone processing factory for cutting, polishing and the like, collecting a large amount of stone powder through water flow, and depositing. In the above-mentioned processing procedure, in order to protect the saw blade, a small amount of cutting fluid containing a small amount of phosphate and organic matters is usually added into the cooling water, so that stone saw mud is weak acid, and the stacking and landfill of the stone saw mud can cause environmental pollution and groundwater pollution. Therefore, how to realize the recycling of stone sawing mud is also a problem which needs to be solved urgently at present.
The stone sawing mud is directly used as inert powder and is used as a filling material in concrete, but the application does not play a role in recycling the stone sawing mud, the consumption is small, and each concrete can only use 60-120 kg, which is far from enough for processing enterprises producing a large amount of sawing mud every day. The application provides a low-cost and environment-friendly stone sawing mud recycled aggregate and a preparation method thereof.
Disclosure of Invention
The stone sawing mud recycled aggregate with low cost and environmental protection is prepared from the following raw materials in parts by weight: 50-80% of stone sawing mud, 0-30% of carbide slag or 0-20% of lime, 2-5% of phosphogypsum, 0-20% of cement and 0-0.5% of additive.
Further, the stone sawing mud recycled aggregate comprises the following raw materials in parts by weight: 70% of stone sawing mud, 28% of carbide slag, 2% of phosphogypsum, 0% of cement and 0.3% of additive. .
Further, the stone sawing mud recycled aggregate stone sawing mud comprises 75% of lime 18%, 2% of phosphogypsum, 5% of cement and 0.2% of additive.
Further, the stone sawing mud recycled aggregate comprises SiO in the stone sawing mud 2 The content is more than or equal to 70%, the screen residue of a square hole screen with fineness of 0.08mm is less than or equal to 12%, and the water content is 20%. The effective CaO content of the carbide slag is more than or equal to 65 percent; the cement is P.O42.5 cement; phosphogypsum is industrial waste residue discharged by phosphorus chemical enterprises.
Furthermore, the additive is a composite liquid, which has the function of treating harmful impurities in stone sawing mud, carbide slag and phosphogypsum, and has the function of exciting SiO in stone sawing mud under the conditions of high temperature and high pressure 2 The active function improves the reaction efficiency of hydrothermal synthesis, and leads the product to generate more toboloneAnd (3) stone.
The preparation method of the stone sawing mud recycled aggregate is low in cost and environment-friendly, and is characterized by comprising the following steps of:
(1) In a system with 70% of stone sawing mud, 28% of carbide slag, 2% of phosphogypsum, 0% of cement and 0.3% of additive, the stone sawing mud must be subjected to filter pressing, the water content is controlled to be less than 10%, and the carbide slag is dried and scattered and then uniformly mixed according to the proportion of the materials. In a system with the material composition of 75% of stone sawing mud, 18% of lime, 2% of phosphogypsum, 5% of cement and 0.2% of exciting agent, the stone sawing mud and lime are pretreated so that the water content of the stone sawing mud and lime is less than 10%, and the stone sawing mud and the lime are mixed and then placed for more than 24 hours, and then the stone sawing mud and the lime are mixed with other materials. The above aqueous materials are on a dry basis.
(2) And (3) placing a proper amount of the mixture in a die, and pressurizing to 40 MPa+/-1 MPa to prepare cylinders with diameters phi 20mm, phi 30mm and phi 50mm and thicknesses 20-30 mm.
(3) Putting the cylinders with different sizes into an autoclave for autoclave curing, and performing autoclave curing process: vacuumizing for 0.5h, increasing the pressure for 1h, maintaining the pressure for 8h, reducing the pressure for 0.5h, wherein the maintaining pressure is 1.35MPa plus or minus 0.15MPa. And (3) naturally cooling to room temperature after the mixture is discharged from the autoclave, and thus obtaining the recycled aggregate with the pressure of 30-80 MPa.
The application has the following beneficial effects:
the application can fully adopt industrial waste residues, and in a system which comprises 70% of stone sawing mud, 28% of carbide slag, 2% of phosphogypsum, 0% of cement and 0.3% of additive, the production cost is low, the utilization rate of solid waste residues reaches 100%, and the compressive strength of the prepared recycled aggregate can reach 30MPa, so that the application can be used for producing coarse aggregate of low-strength grade concrete. In a system with the material composition of stone sawing mud 75%, lime 18%, phosphogypsum 2%, cement 5% and excitant 0.2%, the utilization rate of solid waste residue reaches 77%, and the compressive strength of the prepared recycled aggregate can reach more than 60MPa, so that the recycled aggregate can be used for producing coarse aggregates of middle-strength and high-strength grade concrete.
After the recycled aggregate is changed into different dies, the high-strength floor tile and the high-strength plate can be prepared.
Description of the embodiments
The following are combined and implementedExamples the present application will be described in further detail; siO in the stone sawing mud used in the examples 2 The content is more than or equal to 70%, the screen residue of a square hole screen with fineness of 0.08mm is less than or equal to 12%, and the water content is 20%. The effective CaO content of the carbide slag is more than or equal to 65 percent; the cement is P.O42.5 cement; phosphogypsum is industrial waste residue discharged by phosphorus chemical enterprises; the additive is a compound liquid, which has the function of treating harmful impurities in stone sawing mud, carbide slag and phosphogypsum, and has the function of exciting SiO in stone sawing mud under the conditions of high temperature and high pressure 2 The activity function improves the reaction efficiency of hydrothermal synthesis, and the product can generate more tobermorite.
Examples
The stone sawing mud recycled aggregate with low cost and environmental protection comprises the following raw materials in parts by weight: 70% of stone sawing mud, 28% of carbide slag, 2% of phosphogypsum, 0% of cement and 0.3% of additive.
Specifically, the additive is a composite liquid, which has the function of treating harmful impurities in stone sawing mud, carbide slag and phosphogypsum, and also has the function of exciting SiO in stone sawing mud under the conditions of high temperature and high pressure 2 The activity function improves the reaction efficiency of hydrothermal synthesis, and the product can generate more tobermorite.
The preparation method of the stone sawing mud recycled aggregate with low cost and environmental protection is characterized by comprising the following steps:
and (3) carrying out filter pressing on stone sawing mud containing a large amount of water, controlling the water content to be less than 10%, drying and scattering carbide slag, and uniformly mixing according to the material proportion.
And placing a proper amount of the mixture in a die, pressurizing to 40 MPa+/-1 MPa, and preparing a cylinder with the diameter phi of 20mm, the diameter phi of 30mm and the diameter phi of 50mm and the thickness of 20-30 mm.
Putting the cylinders with different sizes into an autoclave for autoclave curing, and performing autoclave curing process: vacuumizing for 0.5h, increasing the pressure for 1h, maintaining the pressure for 8h, reducing the pressure for 0.5h, wherein the maintaining pressure is 1.2-1.5 MPa. And (3) naturally cooling to room temperature after the mixture is discharged from the autoclave, so that the recycled aggregate with the compressive strength of 30MPa can be prepared.
Examples
The stone sawing mud recycled aggregate with low cost and environmental protection comprises the following raw materials in parts by weight: 70% of stone sawing mud, 23% of carbide slag, 2% of phosphogypsum, 5% of cement and 0.3% of additive.
Specifically, the preparation method of the stone sawing mud recycled aggregate with low cost and environmental protection is characterized by comprising the following steps:
(1) And (3) carrying out filter pressing on stone sawing mud containing a large amount of water, controlling the water content to be less than 10%, drying and scattering carbide slag, and uniformly mixing according to the material proportion. (2) And (3) placing a proper amount of the mixture in a die, and pressurizing to 40 MPa+/-1 MPa to prepare cylinders with diameters phi 20mm, phi 30mm and phi 50mm and thicknesses 20-30 mm. (3) Putting the cylinders with different sizes into an autoclave for autoclave curing, and performing autoclave curing process: vacuumizing for 0.5h, increasing the pressure for 1h, maintaining the pressure for 8h, reducing the pressure for 0.5h, wherein the maintaining pressure is 1.35MPa plus or minus 0.15MPa. And (3) naturally cooling to room temperature after the mixture is discharged from the autoclave, and thus the recycled aggregate with the compressive strength of 40MPa can be prepared.
Examples
The stone sawing mud recycled aggregate with low cost and environmental protection comprises the following raw materials in parts by weight: 75% of stone sawing mud, 18% of lime, 2% of phosphogypsum, 5% of cement and 0.2% of additive.
Specifically, siO in the stone sawing mud 2 The content is more than or equal to 70%, the screen residue of a square hole screen with fineness of 0.08mm is less than or equal to 12%, and the water content is 20%. The effective CaO content of lime is more than or equal to 65 percent; the cement is P.O42.5 cement; phosphogypsum is industrial waste residue discharged by phosphorus chemical enterprises.
Specifically, the additive is a composite liquid, which has the function of treating harmful impurities in stone sawing mud and phosphogypsum, and also has the function of exciting SiO in stone sawing mud under the conditions of high temperature and high pressure 2 The activity function improves the reaction efficiency of hydrothermal synthesis, and the product can generate more tobermorite.
The preparation method of the stone sawing mud recycled aggregate with low cost and environmental protection is characterized by comprising the following steps:
(1) Pretreating stone sawing mud and lime, mixing, standing for more than 24 hours, and mixing with other materials. (2) And (3) placing a proper amount of the mixture in a die, and pressurizing to 40 MPa+/-1 MPa to prepare cylinders with diameters phi 20mm, phi 30mm and phi 50mm and thicknesses 20-30 mm. (3) Putting the cylinders with different sizes into an autoclave for autoclave curing, and performing autoclave curing process: vacuumizing for 0.5h, increasing the pressure for 1h, maintaining the pressure for 8h, reducing the pressure for 0.5h, wherein the maintaining pressure is 1.35MPa plus or minus 0.15MPa. And (3) naturally cooling to room temperature after the mixture is discharged from the autoclave, and thus the recycled aggregate with the compressive strength of 50MPa can be prepared.
The stone sawing mud recycled aggregate with low cost and environmental protection comprises the following raw materials in parts by weight: 60% of stone sawing mud, 18% of lime, 2% of phosphogypsum, 20% of cement and 0.2% of additive.
Specifically, siO in the stone sawing mud 2 The content is more than or equal to 70%, the screen residue of a square hole screen with fineness of 0.08mm is less than or equal to 12%, and the water content is 20%. The effective CaO content of lime is more than or equal to 65 percent; the cement is P.O42.5 cement; phosphogypsum is industrial waste residue discharged by phosphorus chemical enterprises.
Specifically, the additive is a composite liquid, which has the function of treating harmful impurities in stone sawing mud and phosphogypsum, and also has the function of exciting SiO in stone sawing mud under the conditions of high temperature and high pressure 2 The activity function improves the reaction efficiency of hydrothermal synthesis, and the product can generate more tobermorite.
The preparation method of the stone sawing mud recycled aggregate with low cost and environmental protection is characterized by comprising the following steps:
(1) Pretreating stone sawing mud and lime, mixing, standing for more than 24 hours, and mixing with other materials.
(2) And (3) placing a proper amount of the mixture in a die, and pressurizing to 40 MPa+/-1 MPa to prepare cylinders with diameters phi 20mm, phi 30mm and phi 50mm and thicknesses 20-30 mm.
(3) Putting the cylinders with different sizes into an autoclave for autoclave curing, and performing autoclave curing process: vacuumizing for 0.5h, increasing the pressure for 1h, maintaining the pressure for 8h, reducing the pressure for 0.5h, wherein the maintaining pressure is 1.35MPa plus or minus 0.15MPa. And (3) naturally cooling to room temperature after the mixture is discharged from the autoclave, so that the recycled aggregate with the compressive strength of 70MPa can be prepared.
The compressive strength, the solid waste utilization rate and the economical analysis of the recycled aggregate by adopting the four example schemes are shown in table 1.
Table 1 comparison of four embodiments
| Project | Example one | Example two | Example three | Example four |
| Compressive strength of recycled aggregate, MPa | 30 | 40 | 50 | 70 |
| The utilization rate of solid waste slag is percent | 100 | 95 | 77 | 62 |
| Economical efficiency | Good (good) | Medium and medium | In general | Difference of difference |
By comparing the four schemes, the compressive strength of the prepared recycled aggregate has great correlation with the economical efficiency.
The above examples are only for further explanation of the present application, and are not intended to limit the proportioning parameters and process flow (e.g. preparing floor tiles, plates, etc.), and the material composition and preparation method related thereto should be within the scope of the present application.
Claims (7)
1. The utility model provides a low-cost, green stone material saw mud regeneration aggregate which characterized in that: the material is prepared from the following raw materials in parts by weight: 50-80% of stone sawing mud, 2-5% of phosphogypsum, 0-20% of cement, 0-0.5% of additive, 0-30% of carbide slag or 0-20% of lime.
2. The low-cost, green and environment-friendly stone sawing mud recycled aggregate according to claim 1, wherein the aggregate is characterized in that: comprises the following raw materials in parts by weight: 70% of stone sawing mud, 28% of carbide slag, 2% of phosphogypsum, 0% of cement and 0.3% of additive.
3. The low-cost, green and environment-friendly stone sawing mud recycled aggregate according to claim 1, wherein the aggregate is characterized in that: the stone sawing mud recycled aggregate stone sawing mud is 75%, lime is 18%, phosphogypsum is 2%, cement is 5% and additive is 0.2%.
4. The low-cost, green and environment-friendly stone sawing mud recycled aggregate according to claim 1, wherein the aggregate is characterized in that: siO in the stone sawing mud 2 The content is more than or equal to 70%, the screen residue of a square hole screen with fineness of 0.08mm is less than or equal to 12%, and the water content is 20%. The effective CaO content of the carbide slag is more than or equal to 65 percent; the cement is P.O42.5 cement; phosphogypsum is industrial waste residue discharged by phosphorus chemical enterprises.
5. The low-cost, green and environment-friendly stone sawing mud recycled aggregate according to claim 1, wherein the aggregate is characterized in that: the additive is a composite liquid, which has the function of treating harmful impurities in stone sawing mud, carbide slag and phosphogypsum, and has the function of exciting SiO in stone sawing mud under the conditions of high temperature and high pressure 2 Active function, improving hydrothermal synthesis reaction efficiencySo that the product can generate more tobermorite.
6. The preparation method of the stone sawing mud recycled aggregate is low in cost and environment-friendly, and is characterized by comprising the following steps of:
(1) In a system with 70% of stone sawing mud, 28% of carbide slag, 2% of phosphogypsum, 0% of cement and 0.3% of additive, the stone sawing mud is subjected to pressure filtration, the water content is controlled to be less than 10%, and the carbide slag is dried and scattered and then uniformly mixed according to the proportion of the materials. In a system with the material composition of 75% of stone sawing mud, 18% of lime, 2% of phosphogypsum, 5% of cement and 0.2% of additive, the stone sawing mud and lime are pretreated so that the water content of the stone sawing mud and lime is less than 10%, and the stone sawing mud and the lime are mixed and then placed for more than 24 hours, and then the stone sawing mud and the lime are mixed with other materials. The above aqueous materials are on a dry basis. (2) Placing a proper amount of the mixture in a mould, and pressurizing to 40 MPa+/-1 MPa to obtain a prefabricated product;
(3) Putting the prefabricated material into an autoclave for autoclave curing, and performing an autoclave curing process: vacuumizing for 0.5h, increasing the pressure for 1h, maintaining the pressure for 8h, reducing the pressure for 0.5h, wherein the maintaining pressure is 1.35MPa plus or minus 0.15MPa. And (3) naturally cooling to room temperature after the mixture is discharged from the autoclave, and thus obtaining the recycled aggregate with the pressure of 30-70 MPa.
7. The application of the low-cost and environment-friendly stone sawing mud recycled aggregate is characterized in that the recycled aggregate can be used for preparing floor tiles and plates with different strength grades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310877359.6A CN117049808A (en) | 2023-07-18 | 2023-07-18 | Low-cost and environment-friendly stone sawing mud recycled aggregate, preparation method and application |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310877359.6A CN117049808A (en) | 2023-07-18 | 2023-07-18 | Low-cost and environment-friendly stone sawing mud recycled aggregate, preparation method and application |
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| Publication Number | Publication Date |
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| CN117049808A true CN117049808A (en) | 2023-11-14 |
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| CN202310877359.6A Pending CN117049808A (en) | 2023-07-18 | 2023-07-18 | Low-cost and environment-friendly stone sawing mud recycled aggregate, preparation method and application |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200346065Y1 (en) * | 2003-12-19 | 2004-03-27 | 학교법인 민송학원 | Porous environment-friendly polymer concrete block |
| CN110668776A (en) * | 2019-11-11 | 2020-01-10 | 杜世永 | Method for preparing artificial sand, gravel and sand powder from solid waste residues |
| CN114436613A (en) * | 2022-03-10 | 2022-05-06 | 武汉楚天名扬建材有限公司 | Treatment-free saw mud based cementing material and preparation method and application thereof |
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2023
- 2023-07-18 CN CN202310877359.6A patent/CN117049808A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200346065Y1 (en) * | 2003-12-19 | 2004-03-27 | 학교법인 민송학원 | Porous environment-friendly polymer concrete block |
| CN110668776A (en) * | 2019-11-11 | 2020-01-10 | 杜世永 | Method for preparing artificial sand, gravel and sand powder from solid waste residues |
| CN114436613A (en) * | 2022-03-10 | 2022-05-06 | 武汉楚天名扬建材有限公司 | Treatment-free saw mud based cementing material and preparation method and application thereof |
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