CN111762998A - High-temperature activated composite sludge powder solidified dewatered sludge/silt and solidification method thereof - Google Patents
High-temperature activated composite sludge powder solidified dewatered sludge/silt and solidification method thereof Download PDFInfo
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- CN111762998A CN111762998A CN202010626760.9A CN202010626760A CN111762998A CN 111762998 A CN111762998 A CN 111762998A CN 202010626760 A CN202010626760 A CN 202010626760A CN 111762998 A CN111762998 A CN 111762998A
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- 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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
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- 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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
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Abstract
The invention provides a high-temperature activated composite sludge powder solidified dewatered sludge/silt and a solidifying method thereof, wherein the high-temperature activated composite sludge powder accounts for 30-300 parts by weight; 1-60 parts of an alkali activator; 1-350 parts of water; 1000 parts of dewatered sludge/silt. The invention takes sludge from different sources as main raw materials, and high-temperature activated composite sludge powder is obtained through high-temperature calcination, mechanical grinding and compounding; the activity of the high-temperature activated composite sludge powder is further improved through alkali excitation; by CO2And (4) maintaining, namely enhancing the solidification effect of the alkali-activated high-temperature activated composite sludge powder on the sludge/silt, and solidifying and stabilizing pollutants of the sludge/silt. The invention improves the activity of the sludge powder by the technologies of high-temperature calcination, mechanical grinding, compounding, alkali excitation and the like of the sludge powder from different sources, replaces the traditional curing agents such as cement, lime and the like, is used for curing harmful solid wastes such as sludge, silt and the like, is used as building materials, and has remarkable social and economic benefitsAnd environmental benefits.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to high-temperature activated composite sludge powder solidified dewatered sludge/silt and a solidifying method thereof.
Background
The domestic sludge and the industrial sludge are terminal wastes of municipal sewage treatment and industrial wastewater respectively, the domestic sludge mainly comes from municipal sewage treatment plants and the like, and the industrial sludge mainly comes from paper mills, chemical plants, concrete mixing plants and the like. The two types of sludge contain a large amount of organic matters, heavy metals, pathogens and other substances, and are very unfavorable for the ecological environment and the human health. The incineration method is a method for harmless treatment of sludge, but only a small part of sludge powder serving as a sludge incineration product is recycled, and most of sludge powder still needs to be buried, so that not only is the resource waste caused, but also heavy metal pollution to the surrounding environment is caused. How to realize the recycling of the sludge and the sludge powder is widely concerned by various fields.
Along with the deep promotion of water environment treatment in China and the rapid development of coastal economy, the coastal sludge and dredging sludge with huge quantities are generated, and the effective treatment of the coastal sludge and the dredging sludge has urgent social requirements. The traditional land reclamation, ocean dumping and other treatment methods have the series of problems of large occupied area, long consumed time, high cost, serious heavy metal pollution and the like. Meanwhile, the infrastructure construction and the beach reclamation project in coastal areas face the problem of the lack of ideal fillers (sand and stone materials). Therefore, the solidified sludge used as a building material for engineering construction is an efficient sludge resource utilization technology, which not only accords with the concept of sustainable development of the current society, but also solves the problems of shortage of engineering filler supply and sludge accumulation and land occupation pollution at the current stage.
At present, the traditional curing agents such as cement, lime and the like have large energy consumption and CO2High discharge, serious environmental pollution and the like. The method utilizes domestic sludge and industrial sludge to prepare sludge powder, adopts the technologies of high-temperature calcination, mechanical grinding, compounding, alkali excitation and the like to improve the activity of the sludge powder, replaces the traditional cementing materials such as cement, lime and the like, is used for sludge/sludge solidification, uses the solidified sludge/sludge as roadbed and embankment fillers, and has remarkable social, economic and environmental benefits.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides environment-friendly high-temperature activated composite sludge powder solidified dehydrated sludge/silt and a solidification method thereof, and solves the problems in the background art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the high-temperature activated composite sludge powder solidified dewatered sludge comprises the following raw materials in parts by weight:
a method for solidifying dewatered sludge/silt by high-temperature activated composite sludge powder comprises the following steps,
(1) firstly, detecting and adjusting chemical components of domestic sludge and industrial sludge, and dehydrating the two kinds of sludge after the adjustment to be detected is finished;
(2) drying the dewatered sludge in the step (1) in an oven, calcining at high temperature in a boiler, pouring into water at 25 ℃ for quenching, and filtering out sludge powder particles after cooling;
(3) drying the sludge powder obtained in the step (2) and then fully grinding;
(4) measuring SiO in the two sludge powders obtained in the step (3)2、CaO、Fe2O3、Al2O3The mineral composition proportion and the potential hydration activity are equal;
(5) compounding according to mineral compositions of sludge powder from two different sources to obtain high-temperature activated composite sludge powder;
(6) preparing a corresponding alkali activator according to the mineral composition of the high-temperature activated composite sludge powder, and uniformly mixing the alkali activator with the high-temperature activated composite sludge powder to generate alkali-activated high-temperature activated composite sludge powder;
(7) dewatering the sludge/silt needing to be solidified;
(8) mixing the alkali-activated high-temperature activated composite sludge powder obtained in the step (5) into the dehydrated sludge/silt obtained in the step (7), and uniformly mixing to solidify the dehydrated sludge/silt;
(9) carrying out CO treatment on the sludge/silt solidified by alkali-activated high-temperature activated composite sludge powder2And (5) maintaining.
Preferably, the domestic sludge in the step (1) is from a sewage treatment plant, and the industrial sludge is from a paper mill or a concrete mixing plant.
Preferably, the component adjustment in the step (1) comprises removing or stabilizing heavy metals in the sludge, and the water content of the dewatered sludge is 0-60%.
Preferably, the calcining temperature of the boiler in the step (2) is 500-1000 ℃, and the calcining time of the boiler is 0.1-5 h.
Preferably, the sludge powder in the step (3) is ground to a particle size of less than or equal to 30 μm.
Preferably, the compounding ratio of the domestic sludge powder to the industrial sludge powder in the high-temperature activated composite sludge powder in the step (5) is 1/2-1/4.
Preferably, the alkali-activator in step (6) comprises sodium silicate, sodium hydroxide, calcium hydroxide and active magnesium oxide.
Preferably, the mass ratio of the alkali-activator and the high-temperature activated composite sludge powder in the step (6) is 3-20%.
Preferably, the water content of the dewatered sludge/silt in the step (7) is 0-40%.
Preferably, the usage amount of the alkali-activated high-temperature activated composite sludge powder in the step (8) is 3-30% of the mass of the dewatered sludge/silt.
Preferably, CO is used in step (9)2The carbonization conditions of the curing treatment comprise that the curing temperature is 20-50 ℃, the humidity is 40-80%, and CO220-100% concentration of CO2The air pressure is 0.1 to 0.5 MPa.
(III) advantageous effects
In conclusion, the invention utilizes industrial sludge and domestic sludge to prepare sludge powder, and carries out technologies such as high-temperature calcination, mechanical grinding, compounding, alkali excitation and the like, so that the activity of the sludge powder is improved, the high-temperature activated composite sludge powder is obtained, the traditional curing agents such as cement, lime and the like are replaced, and the problems of environment pollution, large resource consumption and the like of the traditional curing agents are solved. Simultaneously, alkali is utilized to excite high temperature to activate the composite sludge powder, further to solidify industrial and domestic dewatered sludge, dredged and coastal dewatered sludge and pass through CO2The maintenance is enhanced, the dehydration-alkali-activated high-temperature activated composite sludge powder-carbonized composite solidified sludge/sludge meeting the requirements of roadbed and embankment fillers is formed, and the composite sludge/sludge is used as engineering fillers of roadbed, embankment and the like with increasingly shortage of resources, and the problems of difficult disposal, environmental pollution and the like of industrial sludge, domestic sludge, dredging sludge, coastal sludge and the like are solved, so that the invention has remarkable economic, social and environmental benefits.
Drawings
Fig. 1 is a technical route diagram of the present invention.
Detailed Description
An embodiment of the present invention for solidifying dewatered sludge/silt by using high temperature activated composite sludge powder and a solidifying method thereof will be further explained with reference to fig. 1.
A solidification method for solidifying dehydrated sludge/silt by high-temperature activated composite sludge powder comprises the following steps: firstly, detecting and adjusting chemical components of domestic sludge and industrial sludge, and dehydrating the two kinds of sludge after the adjustment to be detected is finished; drying the dewatered sludge in an oven, calcining the dried sludge at high temperature in a boiler, pouring the calcined sludge into water at 25 ℃ for quenching, and filtering out sludge powder particles after cooling; drying the obtained sludge powder and then fully grinding; determination of SiO in sludge powder2、CaO、Fe2O3、Al2O3The mineral composition proportion and the potential hydration activity are equal; compounding two sludge powders from different sources to obtain high-temperature activated composite sludge powder, preparing a corresponding alkali activator according to the mineral composition and the proportion of the high-temperature activated composite sludge powder, and uniformly mixing the alkali activator and the composite sludge powder to generate alkali-activated high-temperature activated composite sludge powder; dewatering the sludge/silt needing to be solidified; mixing alkali-activated high-temperature activated composite sludge powder into the dewatered sludge/silt, and uniformly mixing to solidify the dewatered sludge/silt; carrying out CO treatment on the sludge/silt solidified by alkali-activated high-temperature activated composite sludge powder2And (5) maintaining.
In the invention, the main inorganic chemical component of the sludge comprises SiO2、Al2O3、Fe2O3CaO, etc., having low chemical activity; the high-temperature calcination can remove organic matters in the sludge and increase SiO2、Al2O3、Fe2O3Crystal content, the proportion of the total amount of the crystal is over 60 percent; and amorphous SiO with increasing calcination temperature2The content is increased, and SiO is about 900 DEG C2The content is often the highest, so high-temperature calcination can improve the activity of the sludge powder. The industrial sludge in this embodiment may be sludge from a paper mill, and because the paper mill incorporates natural calcite during the paper making process, CaCO3Is retained in the paper sludge; the CaO content in the paper making sludge powder is higher than SiO after high-temperature calcination2、Al2O3The high-temperature activated composite sludge powder is obtained by compounding and mixing the sludge powder from two different sources, has a chemical composition similar to that of cement, can be used as a sludge/sludge curing agent, has low cost compared with the conventional curing agents such as common cement, lime and the like, and realizes the recycling of sludge powder and slag. The sludge powder is cooled in a quenching mode, so that more crystals in the sludge powder are converted into amorphous glass bodies, and the activity of the sludge powder is further improved. The sludge contains a large amount of amorphous aluminum salt or iron salt, has higher phosphorus adsorption capacity, and can enrich substances such as phosphate, hydrogen sulfide and the like in water, thereby reducing the inhibition of phosphate and hydrogen sulfide on anaerobic ammoxidation in water and enhancing waterThe activity of anaerobic ammonium oxidation bacteria in the body enhances the adsorption capacity of alkali-activated high-temperature activated composite sludge powder for solidifying sludge/silt.
The water content of the dewatered sludge/silt is preferably 0-40%, and the water content is controlled to be below 40%, so that the use amount of a curing agent is reduced, and the curing effect and the economic benefit are improved.
The preferable mechanical grinding of the sludge powder from two different sources ensures that the average particle size is less than 30 mu m, and the activity of the sludge powder is improved by increasing the fineness of the sludge powder.
The preferable alkali activator comprises sodium silicate, sodium hydroxide, calcium hydroxide and active magnesium oxide, and the alkali activator can neutralize humic acid decomposed by organic matters in sludge, maintain an alkali environment and promote hydration reaction; the composite sludge powder can be activated at high temperature by alkali, more gelling hydration products are generated, and the solidification effect of sludge/silt is improved.
Preferred CO of the present invention2And maintenance can promote the generation of carbonized products such as calcium carbonate, magnesium carbonate, silica gel and the like, is beneficial to filling pores and cohesive soil particles in the sludge/silt, reduces and cuts off the leaching path of pollutants such as heavy metals and the like, and improves the pollutant stabilizing effect of the solidified sludge/silt.
Preferred CO for the present invention2The carbonization conditions of the curing treatment include: curing at 20-50 deg.C, humidity of 40-80%, and CO220-100% concentration of CO2The air pressure is 0.1-0.5 MPa, and the engineering performance of the sludge/silt solidified soil and the stabilizing effect on pollutants such as heavy metals can be improved.
The following are three specific examples of the invention under different parameters:
example 1
The sodium silicate alkali-activated high-temperature activated composite sludge powder is used for curing dewatered sludge, and the formula comprises: 1000 parts of absolute dry dewatered sludge, 100 parts of high-temperature activated composite sludge powder (the compounding ratio of the domestic sludge powder to the industrial sludge powder is 1/2), 7 parts of sodium silicate and 175 parts of water. The domestic sludge powder is from sewage plant, the industrial sludge powder is from paper mill, and the average grain size after grinding is about 30 μm. Measuring the chemical composition of the two sludge powders, and then compounding and mixing the two sludge powders to obtain high-temperature activated composite sludge powder; secondly, uniformly mixing a sodium silicate alkali activator and the high-temperature activated composite sludge powder to generate sodium silicate alkali activated high-temperature activated composite sludge powder; then, spraying water into the absolutely dry dewatered sludge, uniformly mixing, and soaking in a closed container for 24 hours; and mixing the sodium silicate alkali-activated high-temperature activated composite sludge powder with the dewatered sludge, preparing a bearing ratio and unconfined compressive strength sample according to the JTGE40-2007 standard of highway geotechnical test regulations under 90% of compactness, and measuring the bearing ratio and 7d unconfined compressive strength of the dewatered sludge cured by the sodium silicate alkali-activated composite sludge powder to be 37.6% and 1.65MPa respectively according to a sample curing system and a test procedure specified by JTG E40-2007.
Example 2
The sodium hydroxide alkali-activated high-temperature activated composite sludge powder is used for curing dewatered sludge, and the formula comprises: 1000 parts of absolute dry dewatered sludge, 100 parts of high-temperature activated composite sludge powder (the compounding ratio of the domestic sludge powder to the industrial sludge powder is 1/3), 5 parts of sodium hydroxide and 175 parts of water. The domestic sludge powder is sourced from a sewage plant, the industrial sludge powder is sourced from a paper mill, the average particle size is about 30 mu m after grinding, and after the chemical composition of the two sludge powders is determined, the two sludge powders are compounded and mixed to obtain high-temperature activated composite sludge powder; secondly, uniformly mixing a sodium hydroxide alkali activator and the high-temperature activated composite sludge powder to generate sodium hydroxide alkali activated high-temperature activated composite sludge powder; then, spraying water into the absolutely dry dewatered sludge, uniformly mixing, and soaking in a closed container for 24 hours; and mixing the sodium hydroxide alkali-activated high-temperature activated composite sludge powder with the dewatered sludge, preparing a bearing ratio and unconfined compressive strength sample according to the JTG E40-2007 standard of highway geotechnical test regulations under 90% of compactness, and measuring the bearing ratio and 7d unconfined compressive strength of the solidified dewatered sludge of the sodium hydroxide alkali-activated high-temperature activated composite sludge powder to be 43.6% and 1.74MPa respectively according to a sample curing system and a test program specified by JTG E40-2007.
Example 3
Magnesium oxide alkali-activated high-temperature activated composite sludge powder-carbonized composite solidified dewatered sludgeThe mud comprises the following components in percentage by weight: 1000 parts of absolutely dry dehydrated sludge, 90 parts of high-temperature activated composite sludge powder (the compounding ratio of the domestic sludge powder to the industrial sludge powder is 1/3), 10 parts of magnesium oxide and 175 parts of water. The domestic sludge powder is sourced from a sewage plant, the industrial sludge powder is sourced from a paper mill, the average particle size is about 30 mu m after grinding, and the two sludge powders are compounded to obtain the high-temperature activated composite sludge powder after measuring the chemical composition of the two sludge powders; secondly, uniformly mixing a magnesia alkali activator and the high-temperature activated composite sludge powder to generate magnesia alkali activated high-temperature activated composite sludge powder; then, spraying water into the absolutely dry dewatered sludge, uniformly mixing, and soaking in a closed container for 24 hours; mixing the magnesia alkali-activated high-temperature activated composite sludge powder with the dewatered sludge, preparing an unconfined compressive strength sample according to road soil engineering test regulation (JTG E40-2007) under 90% compactness, and curing part of the sample for 28d according to a sample curing system specified by JTG E40-2007 to obtain the unconfined compressive strength of the sample for 28d, wherein the unconfined compressive strength of the sample for 28d is 1.82 MPa; after the sample was subjected to standard curing for 21 days, the temperature was controlled at 20 ℃ and 70% relative humidity with 20% CO2Continuing CO under the conditions of concentration and ambient pressure2And (5) curing for 7d, and measuring the unconfined compressive strength of the dehydrated-activated magnesium oxide alkali-activated high-temperature activated composite sludge powder-carbonized composite cured sludge to be 2.24 MPa.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (12)
1. The high-temperature activated composite sludge powder solidified dewatered sludge/silt is characterized in that: the feed comprises the following raw materials in parts by weight:
2. a method for solidifying dehydrated sludge/silt by high-temperature activated composite sludge powder is characterized by comprising the following steps:
(1) firstly, detecting and adjusting chemical components of domestic sludge and industrial sludge, and dehydrating the two kinds of sludge after the adjustment to be detected is finished;
(2) drying the dewatered sludge in the step (1) in an oven, calcining at high temperature in a boiler, pouring into water at 25 ℃ for quenching, and filtering out sludge powder particles after cooling;
(3) drying the sludge powder obtained in the step (2) and then fully grinding;
(4) measuring SiO in the two sludge powders obtained in the step (3)2、CaO、Fe2O3、Al2O3Mineral composition ratio, and potential hydration activity;
(5) compounding according to mineral compositions of sludge powder from two different sources to obtain high-temperature activated composite sludge powder;
(6) preparing a corresponding alkali activator according to the mineral composition of the high-temperature activated composite sludge powder, and uniformly mixing the alkali activator with the high-temperature activated composite sludge powder to generate alkali-activated high-temperature activated composite sludge powder;
(7) dewatering the sludge/silt needing to be solidified;
(8) mixing the alkali-activated high-temperature activated composite sludge powder obtained in the step (5) into the dehydrated sludge/silt obtained in the step (7), and uniformly mixing to solidify the dehydrated sludge/silt;
(9) carrying out CO treatment on the sludge/silt solidified by alkali-activated high-temperature activated composite sludge powder2And (5) maintaining.
3. The method for solidifying the high-temperature activated composite sludge powder solidified dewatered sludge/silt as claimed in claim 2, wherein: the domestic sludge in the step (1) is from a sewage treatment plant, and the industrial sludge is from a paper mill or a concrete mixing plant.
4. The method for solidifying the high-temperature activated composite sludge powder solidified dewatered sludge/silt as claimed in claim 2, wherein: the component adjustment in the step (1) comprises removing or stabilizing heavy metals in the sludge, and the water content of the dewatered sludge is 0-60%.
5. The method for solidifying the high-temperature activated composite sludge powder solidified dewatered sludge/silt as claimed in claim 2, wherein: and (3) calcining the boiler in the step (2) at the temperature of 500-1000 ℃ for 0.1-5.0 h.
6. The method for solidifying the high-temperature activated composite sludge powder solidified dewatered sludge/silt as claimed in claim 2, wherein: grinding the sludge powder in the step (3) until the average particle size is less than or equal to 30 mu m.
7. The method for solidifying the high-temperature activated composite sludge powder solidified dewatered sludge/silt as claimed in claim 2, wherein: the high-temperature activated composite sludge powder in the step (5) is prepared by compounding domestic sludge powder and industrial sludge powder according to the proportion of 1/4-1/2.
8. The method for solidifying the high-temperature activated composite sludge powder solidified dewatered sludge/silt as claimed in claim 2, wherein: the alkali activator in the step (6) comprises sodium silicate, sodium hydroxide, calcium hydroxide and active magnesium oxide.
9. The method for solidifying the high-temperature activated composite sludge powder solidified dewatered sludge/silt as claimed in claim 2, wherein: and (3) the mass ratio of the alkali activator to the high-temperature activated composite sludge powder in the step (6) ranges from 3% to 20%.
10. The method for solidifying the high-temperature activated composite sludge powder solidified dewatered sludge/silt as claimed in claim 2, wherein: and (4) the water content of the dewatered sludge/silt in the step (7) is 0-40%.
11. The method for solidifying the high-temperature activated composite sludge powder solidified dewatered sludge/silt as claimed in claim 2, wherein: and (3) using the alkali-activated high-temperature activated composite sludge powder in the step (8) in an amount of 3-30% of the mass of the dewatered sludge/sludge.
12. The method for solidifying the high-temperature activated composite sludge powder solidified dewatered sludge/silt as claimed in claim 2, wherein: CO in step (9)2The carbonization conditions of the curing treatment comprise curing temperature of 10-50 ℃, humidity of 40-80 percent and CO210-100% concentration of CO2The air pressure is 0-0.5 MPa.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113121155A (en) * | 2021-04-12 | 2021-07-16 | 新华盛节能科技股份有限公司 | Environment-friendly energy-saving geopolymer material taking river and lake sludge as single raw material and preparation method thereof |
| CN113248221A (en) * | 2021-04-21 | 2021-08-13 | 中建材创新科技研究院有限公司 | Gypsum block |
| CN114997061A (en) * | 2022-06-14 | 2022-09-02 | 扬州阿鲁达环境科技有限公司 | Machine learning-based sludge solidification method and system |
| CN115504638A (en) * | 2022-08-26 | 2022-12-23 | 中交第二航务工程局有限公司 | Carbon dioxide mineralization maintenance method for river and lake dredging bottom mud |
-
2020
- 2020-07-02 CN CN202010626760.9A patent/CN111762998A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113121155A (en) * | 2021-04-12 | 2021-07-16 | 新华盛节能科技股份有限公司 | Environment-friendly energy-saving geopolymer material taking river and lake sludge as single raw material and preparation method thereof |
| CN113248221A (en) * | 2021-04-21 | 2021-08-13 | 中建材创新科技研究院有限公司 | Gypsum block |
| CN114997061A (en) * | 2022-06-14 | 2022-09-02 | 扬州阿鲁达环境科技有限公司 | Machine learning-based sludge solidification method and system |
| CN114997061B (en) * | 2022-06-14 | 2023-08-15 | 扬州阿鲁达环境科技有限公司 | Sludge curing method and system based on machine learning |
| CN115504638A (en) * | 2022-08-26 | 2022-12-23 | 中交第二航务工程局有限公司 | Carbon dioxide mineralization maintenance method for river and lake dredging bottom mud |
| CN115504638B (en) * | 2022-08-26 | 2023-06-23 | 中交第二航务工程局有限公司 | Carbon dioxide mineralization maintenance method for river and lake dredging bottom mud |
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Address after: 312000, No. 508 West Ring Road, Yuecheng District, Zhejiang, Shaoxing Applicant after: SHAOXING University Applicant after: Zhejiang Yongjian New Material Technology Co., Ltd Address before: 312000, No. 508 West Ring Road, Yuecheng District, Zhejiang, Shaoxing Applicant before: SHAOXING University Applicant before: SHAOXING YONGJIAN ARCHITECTURAL TECHNOLOGY Co.,Ltd. |
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Application publication date: 20201013 |
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| WW01 | Invention patent application withdrawn after publication |