CN110372240B - Preparation and use method of normal-temperature-curing low-price alkali-activated cement - Google Patents

Preparation and use method of normal-temperature-curing low-price alkali-activated cement Download PDF

Info

Publication number
CN110372240B
CN110372240B CN201910835460.9A CN201910835460A CN110372240B CN 110372240 B CN110372240 B CN 110372240B CN 201910835460 A CN201910835460 A CN 201910835460A CN 110372240 B CN110372240 B CN 110372240B
Authority
CN
China
Prior art keywords
cement
alkali
normal temperature
raw
clinker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910835460.9A
Other languages
Chinese (zh)
Other versions
CN110372240A (en
Inventor
彭美勋
马洪超
刘文伟
肖秋国
宋飞
朱赞宇
樊鑫锋
李广
周心怡
矫心悦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan xiangchuxian road environmental protection technology Co., Ltd
Original Assignee
Hunan Xiangchuxian Road Environmental Protection Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CN201910512806 priority Critical
Priority to CN2019105128061 priority
Application filed by Hunan Xiangchuxian Road Environmental Protection Technology Co Ltd filed Critical Hunan Xiangchuxian Road Environmental Protection Technology Co Ltd
Publication of CN110372240A publication Critical patent/CN110372240A/en
Application granted granted Critical
Publication of CN110372240B publication Critical patent/CN110372240B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B12/00Cements not provided for in groups C04B7/00 - C04B11/00
    • C04B12/04Alkali metal or ammonium silicate cements Alkyl silicate cements; Silica sol cements; Soluble silicate cements

Abstract

The invention discloses a preparation and use method of normal temperature curing cheap alkali-activated cement, which comprises the steps of mixing and grinding a small amount of industrial alkali, sodium potassium aluminosilicate and calcareous raw materials, calcining at 1250-1300 ℃, quenching to obtain clinker, grinding the clinker into powder, uniformly mixing 3.0-10.0% of sodium silicate with the modulus of 1.0-2.0 to obtain the cement, adding water into the cement during use, uniformly mixing, vibrating to form a test block, preserving moisture at normal temperature for 28 days, and placing the test block in saturated moisture in the first 7 days. The cement prepared by the method has the characteristics of wide raw materials, low price, low consumption, low carbon emission, stable and easily controlled performance and the like, and has wide application prospect.

Description

Preparation and use method of normal-temperature-curing low-price alkali-activated cement
Technical Field
The invention belongs to the field of cement building materials and application thereof, and particularly relates to a preparation method and a use method of alkali-activated cement.
Background
From 1824, the british J. Asperdin got the patent right of portland cement, the portland cement with huge productivity has been put down in the limelight for the development of human civilization for nearly 200 years, but the preparation of the main composition, namely the portland clinker, still has the outstanding problems of carbon emission, high energy and material consumption, serious pollution of dust and sulfur nitrogen oxide gas, poor corrosion resistance and durability and the like. The alkali-activated cement has the outstanding advantages of early strength, corrosion resistance, good freeze thawing property and the like, can utilize a large amount of solid waste residues, is low-carbon, energy-saving and environment-friendly, and is considered to be one of novel cement varieties which most possibly replace portland cement. The traditional alkali-activated cement is a double-component cement hardened by using strong alkali to activate active amorphous aluminosilicate (calcium) salt, still has a plurality of defects and becomes a bottleneck hindering the popularization and application of the cement: (1) the chemical composition of kaolin is relatively far away from the average value of the upper crust, resources are scarce, and the price of other main raw materials of alkali-activated cement, such as fly ash, blast furnace slag and the like, is increased due to the fact that the main raw materials are used as admixtures of portland cement in large quantity, so that the raw material cost is great; (2) highly incorporated industrial alkali activators (as Na)23-14 wt% of O), which causes high cost and is easy to cause efflorescence to influence durability; (3) the inherent composition variability of the industrial waste residue makes the performance and the preparation process of the alkali-activated cement prepared by taking the industrial waste residue as a main raw material difficult to stably regulate and standardize. Patent CN102730996A discloses a method for preparing single-component alkali-activated cement, which is prepared by mixing SiO-containing cement2、Al2O3And of CaOMixing the solid raw material with alkali, calcining at 950-1200 ℃, cooling, grinding to obtain cement, directly hydrating the cement powder, and maintaining at 50-80 ℃ to obtain hardened cement stone. However, Na is contained in the cement2O+0.658K2The content of O is 6-25%, compared with the traditional two-component alkali-activated cement, the content is not reduced, and all alkali metals are derived from expensive industrial alkali salt, although the calcination temperature is lower, the cost is still higher, and no obvious advantage is generated. Studies of Penmei, et al (Applied Clay Science, 2017,139: 64-71) showed that SiO2、Al2O3CaO, MgO and Na2The clinker obtained by calcining the mixture of O at a temperature of less than 1200 ℃ mainly consists of various crystalline phases, and the hydration phase of the clinker is also mainly a crystalline phase. Since only a few crystal phases have gelation properties, the gelation properties of cement are limited, which is very different from highly-gelling alkali-activated cement in which both cement and hydrated body are amorphous.
Disclosure of Invention
The calcium aluminosilicate is calcined, melted and quenched to obtain the blast furnace slag mainly containing amorphous glass phase, and the blast furnace slag has high alkali-activated gelling property. The alkali metal component is mixed into the calcium aluminosilicate raw material, so that the melting temperature of the calcium aluminosilicate raw material can be obviously reduced, the reaction activity of the calcium aluminosilicate raw material is improved, and the alkali-activated cement prepared by using the calcium aluminosilicate raw material as an active component can also reduce the mixing amount of an alkali activator, thereby reducing the cost from two aspects. The invention aims to provide a preparation method of normal-temperature curing low-cost alkali-activated cement, which is prepared by firing a glass phase-based alkali-activated cement with a chemical composition mainly comprising SiO2、Al2O3、CaO、Na2O and K2And the clinker of O is used for preparing alkali-activated cement with low consumption of alkali-activating agent.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for preparing normal temperature curing cheap alkali-activated cement comprises the steps of mixing industrial alkali, calcium raw materials and sodium potassium aluminosilicate raw materials, grinding the mixture to be full-sized and 100-mesh-screened, fully calcining the mixture at 1250-1350 ℃ in an oxidizing atmosphere, quenching the calcined mixture to obtain dry clinker, grinding the dry clinker to be less than or equal to 10% of fineness of 200-mesh screen residue, and mixing with sodium silicate to obtain the cement.
As a more specific embodimentThe sodium potassium aluminosilicate material is SiO which must be contained in the chemical composition2、Al2O3、Na2O and/or K2Solid matter of O, which is required to oxidize SiO in the residue after calcination at 1100 deg.C sufficiently2+Al2O3+Na2O+K2The mass ratio of O + CaO + MgO is not less than 95.0%, and the content of SiO in the mixture2+Al2O3+Na2O+K2In the total mass of O + CaO + MgO, the contents of all components are respectively CaO: 0-5.0%, MgO: 0 to 2.0% of SiO2:50.0~75.0%,Al2O3:15.0~35.0%,Na2O+K2O:5.0~11.0%。
As a more specific embodiment, the industrial soda refers to caustic soda and/or soda ash, and the content of the caustic soda and/or soda ash is Na2The mass ratio of O to the potassium sodium aluminosilicate raw material after being oxidized and calcined at 1100 ℃ is 0-2.0%.
More specifically, the calcareous raw material is a raw material which can generate a CaO phase when calcined alone, and the mixing amount of the calcareous raw material is 44.0-80.0% by mass ratio of CaO and the potassium sodium aluminosilicate raw material after being oxidized and calcined at 1100 ℃.
In a more specific embodiment, the sodium silicate is water-soluble SiO2And Na2O as a raw material in an amount of SiO contained2+Na2The mass of the O is 3.0-10.0% of the clinker powder, and the modulus of the sodium silicate is 1.0-2.0.
In a more specific embodiment, the post-calcination quenching is a water quenching cooling method commonly used for blast furnace slag quenching, and the clinker cooled to normal temperature by controlling the water quenching water amount is dry and anhydrous.
The invention also provides a use method of the normal-temperature curing low-price alkali-activated cement prepared by the method, which comprises the steps of dissolving and diluting sodium silicate by water, cooling, uniformly mixing with clinker powder to prepare slurry, vibrating and compacting the slurry to obtain a cement paste test block, and maintaining for 28 days under normal temperature and moisture. The corresponding liquid-solid ratio needs to meet the fluidity required by vibration compaction.
As an optimized embodiment, the cement paste test block is cured in air with saturated humidity at normal temperature for 7 days, and is continuously cured in moisture or immersed in water for 28 days after 7 days.
As an optimized implementation mode, in order to meet the comprehensive use performance of the building member and save cost, the sandstone aggregate is doped into the cement slurry before the test block is formed to prepare the concrete, and the corresponding liquid-solid ratio needs to be adjusted to meet the workability and later use performance of the concrete.
The invention has the beneficial effects that:
(1) compared with Portland cement, the cement provided by the invention has the advantages that the limestone demand and the clinker calcination temperature are obviously reduced, the carbon emission, the energy consumption and the cost can be obviously reduced, and the service performance is basically equivalent.
(2) Compared with the traditional two-component alkali-activated cement, the cement has lower industrial alkali demand and the calcination temperature is far lower than the preparation temperature of slag and fly ash, so that the preparation cost of the cement is obviously reduced, the chemical composition of the cement is frequently passively changed along with the production process, the formula is difficult to regulate and control, the stability of the strength performance is poor, and the chemical composition and the strength performance of the cement can be stably regulated and controlled.
Detailed Description
The present invention is further illustrated by the following specific examples, but the scope of the invention to be claimed is not limited thereto.
Preparing soda ash, caustic soda, potassium sodium aluminosilicate raw material and calcium raw material, wherein the potassium sodium aluminosilicate raw material comprises 6 kinds, all of which are natural rock mixture, and SiO in residue after calcination at 1100 deg.C2+Al2O3+Na2O+K2The mass ratio of O + CaO + MgO is 96-98%, and the rest of the chemical components are mainly Fe2O3With TiO2. With SiO2+Al2O3+Na2O+K2The chemical compositions of 6 sodium potassium aluminosilicate raw materials calculated by taking O + CaO + MgO as 100 percent are detailed in Table 1, and the contents of the components meet the requirements of CaO: 0-5.0%, MgO: 0 to 2.0% of SiO2:50.0~75.0%,Al2O3:15.0~35.0%,Na2O+K2O: 5.0 to 11.0 percent. Mixing soda ash or caustic soda with potassium sodium aluminosilicate and calcium raw materials at a certain proportion to obtain 12 raw material formulasThe mixing proportion of the raw materials in the material (detailed in table 2) meets the following requirements: the amount of soda or caustic soda is determined by Na in the soda or caustic soda2The mass ratio of O to the potassium sodium aluminosilicate raw material after calcination at 1100 ℃ is 0-2.0%, and the calcareous raw material comprises CaCO as the main component3The natural limestone, the quicklime, the hydrated lime and the calcium carbide slag containing lime are 44.0-80.0 percent of the mixing amount of the natural limestone, the quicklime, the hydrated lime and the calcium carbide slag containing lime, wherein the mixing amount is calculated according to the mass ratio of CaO and potassium sodium aluminosilicate raw materials after calcination at 1100 ℃. Grinding the mixture for about half an hour by using a cement experimental small grinding ball to ensure that the ground powder has fineness which can completely pass through a standard sieve of 100 meshes. And calcining the ground raw material powder in a common muffle furnace (air atmosphere). The calcination of each raw material was carried out at a maximum temperature in the range of 1250 to 1350 ℃ and a holding time at the maximum temperature of 3 hours. And directly taking the clinker obtained after calcination out of the furnace, granulating and cooling, and controlling the water consumption of water quenching so that the obtained cooled clinker is dry and anhydrous. And grinding the clinker cooled to room temperature to the fineness of less than or equal to 10 percent of the rest of 200 meshes of sieve to obtain the clinker powder. The industrial water glass (modulus 3.2) is mixed with caustic soda to adjust the modulus, and simultaneously water is mixed to achieve the liquid-solid ratio required for preparing cement paste. Cooling the sodium water glass solution, mixing with clinker powder in a cement paste mixer, filling the slurry into a steel mould with the specification of 40 × 40 × 36, vibrating, compacting and molding a prism cement paste test block, and curing in a cement standard curing box in air with the humidity of 20 ℃ being more than 90%. Wherein the content of the sodium silicate is SiO2+Na2The content of O is 3.0-10.0% of the clinker powder, and the modulus of the sodium silicate is 1.0-2.0 (see table 2 for details). And (4) continuously curing the hardened and demoulded test block in a curing box, and detecting the 3-day and 28-day age compressive strength of the test block at a loading speed of 2 KN/S. From the compressive strengths of the test blocks in Table 2, it can be seen that the corresponding cement should substantially meet or exceed the strength properties of the PO42.5 cement.

Claims (5)

1. A preparation method of normal temperature curing cheap alkali-activated cement is characterized in that industrial alkali, calcium raw materials and potassium sodium aluminosilicate raw materials are mixed and ground to be full-sized and 100-mesh-screened, then fully calcined at 1250-1350 ℃ in oxidizing atmosphere and quenched to obtain dry clinker, the dry clinker is ground to be 200-mesh-screened fineness less than or equal to 10%, and then sodium silicate is mixed to prepare the cement; the potassium sodium aluminosilicate raw material is a chemical composition which must contain SiO2、Al2O3、Na2O and/or K2Solid matter of O, which is required to oxidize SiO in the residue after calcination at 1100 deg.C sufficiently2+Al2O3+Na2O+K2The mass ratio of O + CaO + MgO is not less than 95.0%, and the content of SiO in the mixture2+Al2O3+Na2O+K2In the total mass of O + CaO + MgO, the contents of all components are respectively CaO: 0-5.0%, MgO: 0 to 2.0% of SiO2:50.0~75.0%,Al2O3:15.0~35.0%,Na2O+K2O: 5.0-11.0%; the calcareous raw material is a raw material capable of generating a CaO phase during single calcination, and the doping amount of the calcareous raw material is 44.0-80.0% by mass ratio of CaO and potassium sodium aluminosilicate raw material after being oxidized and calcined at 1100 ℃; the industrial alkali refers to caustic soda and/or calcined soda, and the content of the industrial alkali is Na2The mass ratio of O to the potassium sodium aluminosilicate raw material after being oxidized and calcined at 1100 ℃ is 0-2.0%; the sodium silicate is water-soluble SiO2And Na2O as a raw material in an amount of SiO contained2+Na2The mass of the O is 3.0-10.0% of the clinker powder, and the modulus of the sodium silicate is 1.0-2.0.
2. The method for preparing normal temperature curing cheap alkali-activated cement as claimed in claim 1, wherein the post-calcination quenching is a water quenching cooling method commonly used for blast furnace slag quenching, and the clinker cooled to normal temperature is dry and anhydrous.
3. The use method of the normal temperature curing cheap alkali-activated cement prepared by the method of claim 1 or 2 is characterized in that sodium water glass is dissolved and diluted by water, cooled and uniformly mixed with clinker powder to prepare slurry, the slurry is vibrated and compacted to obtain a cement paste test block, and the cement paste test block is maintained for 28 days under the condition of normal temperature moisture retention.
4. The use method of normal temperature curing cheap alkali-activated cement as claimed in claim 3, wherein the cement paste test block is cured in air with saturated humidity at normal temperature 7 days before and then cured in moisture or immersed in water for 28 days after 7 days.
5. The use method of normal temperature curing low-cost alkali-activated cement as claimed in claim 3, wherein the concrete is prepared by mixing sandstone aggregate into the cement slurry before the test block is formed.
CN201910835460.9A 2019-06-13 2019-09-05 Preparation and use method of normal-temperature-curing low-price alkali-activated cement Active CN110372240B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201910512806 2019-06-13
CN2019105128061 2019-06-13

Publications (2)

Publication Number Publication Date
CN110372240A CN110372240A (en) 2019-10-25
CN110372240B true CN110372240B (en) 2021-08-10

Family

ID=68261759

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910835460.9A Active CN110372240B (en) 2019-06-13 2019-09-05 Preparation and use method of normal-temperature-curing low-price alkali-activated cement

Country Status (1)

Country Link
CN (1) CN110372240B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112592147A (en) * 2021-01-24 2021-04-02 湖南科技大学 Preparation and construction method of brick-concrete building waste residue regenerated road base inorganic mixture
CN112592148A (en) * 2021-01-24 2021-04-02 湖南科技大学 Method for preparing structural material by utilizing brick-concrete building solid waste reclaimed sand powder with high doping amount
CN112592077A (en) * 2021-01-24 2021-04-02 湖南科技大学 Brick-concrete building waste residue cold-recycling cementing material and use method thereof
CN113548823B (en) * 2021-08-23 2022-05-24 深圳大学 Potassium aluminosilicate nanogel precursor additive and application thereof in low-calcium system geopolymer

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2032346A (en) * 1933-03-14 1936-03-03 California Portland Cement Co Process of preparing portland cement raw mixtures
US3451665A (en) * 1964-08-31 1969-06-24 Heinrich Zur Strassen Process for the production of a low alkali content cement
EP0061517B1 (en) * 1981-03-31 1984-06-13 BABCOCK-BSH AKTIENGESELLSCHAFT vormals Büttner-Schilde-Haas AG Process for producing a waterproof binder
CN101786868A (en) * 2010-01-20 2010-07-28 湖南科技大学 Preparation method of burn-free acid resistant ceramics
CN102730996A (en) * 2012-07-11 2012-10-17 湖南科技大学 Preparation of single-component alkali-activated cement and application method thereof
CN102875041A (en) * 2012-10-25 2013-01-16 湖南科技大学 Method for preparing room-temperature curing one-component alkali-activated cement with calcination at low temperature
CN103332879A (en) * 2013-07-25 2013-10-02 湖南科技大学 Preparation method of cheap single-component alkali-activated cement and application method thereof
KR101366295B1 (en) * 2012-05-17 2014-02-21 한국건설기술연구원 Powder type alkali activator for cementless concrete
CN104310821A (en) * 2014-10-10 2015-01-28 浙江新明华特种水泥有限公司 Process for sintering white cement via thermal decomposition
CN104446040A (en) * 2014-12-11 2015-03-25 湖南科技大学 Preparation method of composite single-component alkali-activated cement cured at room temperature
CN108658485A (en) * 2018-07-09 2018-10-16 深圳大学 A kind of hydraulic cement clinker and preparation method thereof, hydraulic cement and its application

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2032346A (en) * 1933-03-14 1936-03-03 California Portland Cement Co Process of preparing portland cement raw mixtures
US3451665A (en) * 1964-08-31 1969-06-24 Heinrich Zur Strassen Process for the production of a low alkali content cement
EP0061517B1 (en) * 1981-03-31 1984-06-13 BABCOCK-BSH AKTIENGESELLSCHAFT vormals Büttner-Schilde-Haas AG Process for producing a waterproof binder
CN101786868A (en) * 2010-01-20 2010-07-28 湖南科技大学 Preparation method of burn-free acid resistant ceramics
KR101366295B1 (en) * 2012-05-17 2014-02-21 한국건설기술연구원 Powder type alkali activator for cementless concrete
CN102730996A (en) * 2012-07-11 2012-10-17 湖南科技大学 Preparation of single-component alkali-activated cement and application method thereof
CN102875041A (en) * 2012-10-25 2013-01-16 湖南科技大学 Method for preparing room-temperature curing one-component alkali-activated cement with calcination at low temperature
CN103332879A (en) * 2013-07-25 2013-10-02 湖南科技大学 Preparation method of cheap single-component alkali-activated cement and application method thereof
CN104310821A (en) * 2014-10-10 2015-01-28 浙江新明华特种水泥有限公司 Process for sintering white cement via thermal decomposition
CN104446040A (en) * 2014-12-11 2015-03-25 湖南科技大学 Preparation method of composite single-component alkali-activated cement cured at room temperature
CN108658485A (en) * 2018-07-09 2018-10-16 深圳大学 A kind of hydraulic cement clinker and preparation method thereof, hydraulic cement and its application

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
"用普通粘土制备单组份碱激发水泥的研究";王正红;《中国优秀硕士学位论文全文数据库工程科技I辑》;20150315;第29-39页 *
Bondar, Dali et.al.Effect of heat treatment on reactivity-strength of alkali-activated natural pozzolans.《CONSTRUCTION AND BUILDING MATERIALS》.2011,第4065-4071页. *
Effects of alkali on one-part alkali-activated cement synthesized by calcining bentonite with dolomite and Na2CO3;Peng, Mei Xun et.al;《APPLIED CLAY SCIENCE》;20170430;第64-71页 *
One-part alkali-activated materials: A review;Luukkonen, Tero et.al;《CEMENT AND CONCRETE RESEARCH》;20180131;第1-14页 *

Also Published As

Publication number Publication date
CN110372240A (en) 2019-10-25

Similar Documents

Publication Publication Date Title
CN110372240B (en) Preparation and use method of normal-temperature-curing low-price alkali-activated cement
CN110304847B (en) Wet-grinding carbide slag excitant and preparation method and application thereof
WO2004058662A1 (en) A two-component wet cement, process and application thereof
US7682448B2 (en) High compressive strength silica mortar and manufacturing method thereof
CN107935555B (en) Nickel iron slag ceramic and preparation method thereof
CN102491717B (en) Gypsum-base concrete with performances of sugaring resistance and carbonization resistance, and preparation method thereof
CN107602023B (en) Large-mixing-amount fly ash concrete and preparation method thereof
AU2020101143A4 (en) A Method For Preparing The Fast-Hardening Early-Strength High-Performance All-Solid Waste Concrete
CN111978061B (en) Preparation method of high-water-resistance anhydrous phosphogypsum cementing material
CN108218269B (en) Nickel iron slag cementing material and preparation process thereof
CN108083671A (en) Granulated blast-furnace slag exciting agent and preparation method thereof and purposes
CN111268929B (en) Green and environment-friendly cement and preparation method thereof
CN110092601A (en) A kind of unburned slow-release manufactured aggregate of steel slag base and preparation method thereof
CN110818339A (en) Preparation method of light high-impermeability concrete
EP3694818B1 (en) Method for manufacturing binders hardening by hydration and carbonation
CN109020397A (en) A kind of phase-change energy-storage mortar and preparation method thereof
CN102936121A (en) Composite material used in mine roadway filling
CN106242326B (en) By SiO2Method for preparing ecological cement by using main raw materials
CN101215110B (en) Integral utilization treatment method for aerating concrete waste material
CN106116189B (en) A kind of no first-hand datum lithium slag composite gelled material
AU2020101223A4 (en) A Method for Preparing Cementitious material with all solid wasteContaining Refining Slag
CN110451827B (en) Preparation and use method of steam-cured alkali-activated cement
CN111732352A (en) Low-alkali cement clinker, low-alkali high-strength cement and preparation method thereof
CN108249791B (en) Method for preparing cement with less clinker by calcining cheap sodium salt step by step
CN109987912A (en) Zeolite prepares iron tailings dry powder and mortar

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
TA01 Transfer of patent application right
TA01 Transfer of patent application right

Effective date of registration: 20200818

Address after: Room 1405, building 2, Nanguo Jiayuan, No. 280, Zhutang West Road, Tianxin District, Changsha City, Hunan Province

Applicant after: Hunan xiangchuxian road environmental protection technology Co., Ltd

Address before: 411201, Hunan, Xiangtan Province, Lake District stone horse head

Applicant before: Hunan University of Science and Technology

GR01 Patent grant
GR01 Patent grant