CN111196694B - Production method for preparing elevator counterweight block by utilizing solid waste - Google Patents
Production method for preparing elevator counterweight block by utilizing solid waste Download PDFInfo
- Publication number
- CN111196694B CN111196694B CN202010029528.7A CN202010029528A CN111196694B CN 111196694 B CN111196694 B CN 111196694B CN 202010029528 A CN202010029528 A CN 202010029528A CN 111196694 B CN111196694 B CN 111196694B
- Authority
- CN
- China
- Prior art keywords
- particles
- heavy particles
- solid waste
- batches
- slag
- 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
Links
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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
- B28B1/093—Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B17/00—Hoistway equipment
- B66B17/12—Counterpoises
-
- 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
- C04B18/04—Waste materials; Refuse
- C04B18/30—Mixed waste; Waste of undefined composition
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a production method for preparing an elevator counterweight block by utilizing solid waste, which comprises the following steps: crushing the solid waste into particles with the particle size within 1.5cm by a crusher; the particles were sorted by gravity sorter to a density of 1.2g/cm3～2.0g/cm3Heavy particles of (a); the heavy particles are fed into a harmful substance detector in batches for detection, the batches with the harmful substances in the heavy particles are separated from the system, and the batches without the harmful substances in the heavy particles are used as a balance weight raw material and sent to the next step for treatment; proportioning the components of the heavy particles, the iron powder, the sand and the cement according to the requirement of the balance weight, adding a proper amount of water, and stirring the raw materials by a stirrer to uniformly mix the materials of the components; and pouring the uniformly stirred raw materials into a prefabricated mold, and vibrating by using a vibrating bar to compact, solidify and mold. The invention realizes changing waste into valuable by recycling the solid waste, and simultaneously, the prepared counterweight material has uniform density, convenient filling and use and does not damage the prefabricated mould.
Description
Technical Field
The invention belongs to the technical field of solid waste recycling, and particularly relates to a production method for preparing an elevator counterweight block by using solid waste.
Background
A large amount of counterweight material is used in construction machines, particularly elevators, excavators, cranes, and the like. The traditional balance weight of engineering machinery is generally made of barite mixed iron powder or iron blocks and the like, and Chinese patent (publication number: CN1265064C) discloses a method for filling balance weight and manufacturing a balance weight prefabricated part by using natural barite. In the actual use process, the stacking ratio of the processed barite is about 3t/m3While the bulk specific gravities required for the counterweights are all high, since the bulk specific gravity of the cast iron blocks is about 7t/m3Cast iron blocks or iron balls are often required to be added into the barite powder, and although the method can reduce the cost and meet the requirement of counterweight, the following technical defects still exist: first, the density of the weight material is not uniform. Iron nuggets and barite due to particle size differenceLarge, not uniformly mixed, and uneven density and poor balance after being filled into a mold for molding. When the counterweight is used on engineering machinery, the vehicle is easy to turn over, overturn and the like, and the purpose of counterweight cannot be achieved. Secondly, the cast iron block is easy to damage the prefabricated mould during vibration solidification forming. The cast iron blocks or the iron balls are added into the barite powder, then the cement is added, the mixture is uniformly stirred and poured into the prefabricated mold for solidification and molding, and the cast iron blocks or the iron balls are relatively hard, so that when the cement vibrating bar is used for compacting the counterweight material, the cast iron blocks or the iron balls can collide with the prefabricated mold, the prefabricated mold is abraded or damaged, and the service life of the prefabricated mold is shortened.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the production method for preparing the elevator counterweight block by using the solid waste can reduce the production cost under the condition of not consuming barite resources, has wide material sources, realizes changing waste into valuable by recycling, has uniform density of the manufactured counterweight material, is convenient to load and use, and does not damage a prefabricated die.
In order to solve the technical problem, the invention provides a production method for preparing an elevator counterweight block by utilizing solid waste, which comprises the following steps:
crushing solid waste into particles with the particle size within 1.5cm by a crusher;
step two, sorting the particles by a gravity sorting machine to obtain particles with the density of 1.2g/cm3～2.0g/cm3Heavy particles of (a);
step three, the heavy particles are put into a harmful substance detector in batches for detection, the batches with the harmful substances in the heavy particles are separated from the system, and the batches without the harmful substances in the heavy particles are used as a balance weight raw material to be sent to the next step for treatment;
step four, proportioning the components of the heavy particles, the iron powder, the sand and the cement according to the requirement of the balance weight, adding a proper amount of water, and stirring the raw materials by a stirrer to uniformly mix the materials of the components;
and step five, pouring the uniformly stirred raw materials into a prefabricated mold, and vibrating and compacting by using a vibrating rod, and solidifying and molding.
In the fourth step, the weight percentage of the heavy particles is 30-50%, the weight percentage of the iron powder is 10-30%, the weight percentage of the sand stone is 10-30%, and the weight percentage of the cement is 5-10%.
As a preferable mode of the present invention, in the second step, the density of the heavy particles sorted out by the gravity sorter is 1.5g/cm3～2.0g/cm3In (1).
In the step five, the material is vibrated to be dense by using a vibrating bar and then solidified and molded by a hot air drier.
As a preferred embodiment of the present invention, the step five is followed by a step of: and (4) coating and sealing the solidified and molded balancing weight by using an iron sheet.
As a preferable aspect of the present invention, the solid waste includes waste metal, glass, ceramic, blast furnace slag, steel slag, red mud, non-ferrous slag, fly ash, coal slag, sulfuric acid slag, waste gypsum, desulfurized fly ash, carbide slag and salt slurry.
Compared with the prior art, the production method for preparing the elevator counterweight block by utilizing the solid waste has the beneficial effects that:
(1) according to the invention, through the crushing process, the solid waste is crushed into particles with the particle size within 1.5cm, so that the particle size of the balance weight raw material is limited within a smaller range, the particle size difference of each component is reduced, the components can be uniformly mixed in stirring, and the solidified and formed balancing weight has uniform density and good balance; moreover, as the grain diameter of the weight balancing raw material is small, the wear or damage of the prefabricated die can not be caused when the vibration rod is used for compacting the weight balancing material, and the service life of the prefabricated die is prolonged;
(2) the invention separates the particles with the density of 1.2g/cm through the gravity separation process3～2.0g/cm3The heavy particles can avoid the light particles from being mixed into the counterweight raw material to cause that the counterweight block can not reach the weight standard;
(3) according to the invention, through a harmful substance detection process, batches with harmful substances (such as reflective substances, toxic substances or gases) existing in heavy particles are separated from the system, and the batches without the harmful substances existing in the heavy particles are used as a counterweight raw material and sent to the next step for treatment, so that the doping of the harmful substances is avoided, and the use safety of counterweight products is ensured;
(4) the invention adopts heavy particles, iron powder, sand and cement as the balance weight raw materials, has easy material taking and low cost.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
A production method for preparing an elevator counterweight block by utilizing solid waste comprises the following steps:
crushing solid waste into particles with the particle size within 1.5cm by a crusher; wherein the solid waste comprises waste metal, glass, ceramics, blast furnace slag, steel slag, red mud, non-ferrous slag, fly ash, coal slag, sulfuric acid slag, waste gypsum, desulfurized fly ash, carbide slag and salt slurry;
step two, sorting the particles by a gravity sorting machine to obtain particles with the density of 1.2g/cm3～1.5g/cm3Heavy particles of (a);
step three, the heavy particles are put into a harmful substance detector in batches for detection, the batches with the harmful substances in the heavy particles are separated from the system, and the batches without the harmful substances in the heavy particles are used as a balance weight raw material to be sent to the next step for treatment;
step four, proportioning the components of the heavy particles, the iron powder, the sand and the cement according to the requirement of the balance weight, adding a proper amount of water, and stirring the raw materials by a stirrer to uniformly mix the materials of the components; wherein, the weight percentage of the heavy particles is 30-50%, the weight percentage of the iron powder is 10-30%, the weight percentage of the sand stone is 10-30%, and the weight percentage of the cement is 5-10%; in addition, the particle size of the sand is within 1.5 cm;
and step five, pouring the uniformly stirred raw materials into a prefabricated mold, vibrating and compacting by using a vibrating bar, and accelerating solidification and molding by using a hot air drier.
Further, in order to prevent the counterweight block from being damaged due to collision in the installation or transportation process due to certain brittleness after cement is solidified, a step is carried out after the fifth step: and (4) coating and sealing the solidified and molded balancing weight by using an iron sheet.
Example 2
A production method for preparing an elevator counterweight block by utilizing solid waste comprises the following steps:
crushing solid waste into particles with the particle size within 1.5cm by a crusher; wherein the solid waste comprises waste metal, glass, ceramics, blast furnace slag, steel slag, red mud, non-ferrous slag, fly ash, coal slag, sulfuric acid slag, waste gypsum, desulfurized fly ash, carbide slag and salt slurry;
step two, sorting the particles by a gravity sorting machine to obtain particles with the density of 1.5g/cm3～2.0g/cm3Heavy particles of (a);
step three, the heavy particles are put into a harmful substance detector in batches for detection, the batches with the harmful substances in the heavy particles are separated from the system, and the batches without the harmful substances in the heavy particles are used as a balance weight raw material to be sent to the next step for treatment;
step four, proportioning the components of the heavy particles, the iron powder, the sand and the cement according to the requirement of the balance weight, adding a proper amount of water, and stirring the raw materials by a stirrer to uniformly mix the materials of the components; wherein, the weight percentage of the heavy particles is 30-50%, the weight percentage of the iron powder is 10-30%, the weight percentage of the sand stone is 10-30%, and the weight percentage of the cement is 5-10%; in addition, the particle size of the sand is within 1.5 cm;
and step five, pouring the uniformly stirred raw materials into a prefabricated mold, vibrating and compacting by using a vibrating bar, and accelerating solidification and molding by using a hot air drier.
Further, in order to prevent the counterweight block from being damaged due to collision in the installation or transportation process due to certain brittleness after cement is solidified, a step is carried out after the fifth step: and (4) coating and sealing the solidified and molded balancing weight by using an iron sheet.
In summary, the key points of the present invention are:
(1) according to the invention, through the crushing process, the solid waste is crushed into particles with the particle size within 1.5cm, so that the particle size of the balance weight raw material is limited within a smaller range, the particle size difference of each component is reduced, the components can be uniformly mixed in stirring, and the solidified and formed balancing weight has uniform density and good balance; moreover, as the grain diameter of the weight balancing raw material is small, the wear or damage of the prefabricated die can not be caused when the vibration rod is used for compacting the weight balancing material, and the service life of the prefabricated die is prolonged;
(2) the invention separates the particles with the density of 1.2g/cm through the gravity separation process3～2.0g/cm3The heavy particles can avoid the light particles from being mixed into the counterweight raw material to cause that the counterweight block can not reach the weight standard;
(3) according to the invention, through a harmful substance detection process, batches with harmful substances (such as reflective substances, toxic substances or gases) existing in heavy particles are separated from the system, and the batches without the harmful substances existing in the heavy particles are used as a counterweight raw material and sent to the next step for treatment, so that the doping of the harmful substances is avoided, and the use safety of counterweight products is ensured;
(4) the invention adopts heavy particles, iron powder, sand and cement as the balance weight raw materials, has easy material taking and low cost.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (6)
1. A production method for preparing an elevator counterweight block by utilizing solid waste is characterized by comprising the following steps:
crushing solid waste into particles with the particle size within 1.5cm by a crusher;
step two, sorting the particles by a gravity sorting machine to obtain particles with the density of 1.2g/cm3～2.0g/cm3Heavy particles of (a);
step three, the heavy particles are put into a harmful substance detector in batches for detection, the batches with the harmful substances in the heavy particles are separated from the system, and the batches without the harmful substances in the heavy particles are used as a balance weight raw material to be sent to the next step for treatment;
step four, proportioning the components of the heavy particles, the iron powder, the sand and the cement according to the requirement of the balance weight, adding a proper amount of water, and stirring the raw materials by a stirrer to uniformly mix the materials of the components;
and step five, pouring the uniformly stirred raw materials into a prefabricated mold, and vibrating and compacting by using a vibrating rod, and solidifying and molding.
2. The method as claimed in claim 1, wherein in the fourth step, the weight percentage of the heavy particles is 30-50%, the weight percentage of the iron powder is 10-30%, the weight percentage of the sand and stone is 10-30%, and the weight percentage of the cement is 5-10%.
3. The method for manufacturing elevator counterweight block by using solid waste material as claimed in claim 1, wherein in said second step, the density of the heavy particles sorted by the gravity sorter is 1.5g/cm3～2.0g/cm3In (1).
4. The method for manufacturing the elevator counterweight block by using the solid waste material as claimed in claim 1, wherein in the step five, after the vibration compaction by using the vibrating rod, the solidification forming is performed by a hot air drier.
5. The method for manufacturing elevator counterweight block by using solid waste material as claimed in claim 1, wherein a step after said step five is: and (4) coating and sealing the solidified and molded balancing weight by using an iron sheet.
6. The method as claimed in claim 1, wherein the solid waste material comprises waste metal, waste glass, waste ceramic, blast furnace slag, steel slag, non-ferrous slag, fly ash, coal slag, sulfuric acid slag, waste gypsum, desulfurized fly ash, carbide slag and salty mud.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010029528.7A CN111196694B (en) | 2020-01-10 | 2020-01-10 | Production method for preparing elevator counterweight block by utilizing solid waste |
| PCT/CN2020/114928 WO2021139202A1 (en) | 2020-01-10 | 2020-09-12 | Production method for preparing elevator counterweight by using solid waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010029528.7A CN111196694B (en) | 2020-01-10 | 2020-01-10 | Production method for preparing elevator counterweight block by utilizing solid waste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111196694A CN111196694A (en) | 2020-05-26 |
| CN111196694B true CN111196694B (en) | 2021-07-27 |
Family
ID=70742139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010029528.7A Active CN111196694B (en) | 2020-01-10 | 2020-01-10 | Production method for preparing elevator counterweight block by utilizing solid waste |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111196694B (en) |
| WO (1) | WO2021139202A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111196694B (en) * | 2020-01-10 | 2021-07-27 | 丁雄标 | Production method for preparing elevator counterweight block by utilizing solid waste |
| CN112441789A (en) * | 2020-12-23 | 2021-03-05 | 东莞市友润光电科技有限公司 | Environment-friendly balancing weight and manufacturing method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101190831A (en) * | 2006-11-29 | 2008-06-04 | 段焰德 | Counter weight products and production method thereof |
| CN101733837A (en) * | 2009-12-07 | 2010-06-16 | 黎罕 | Production and manufacture method of concrete clump weight with specific gravity capable of being exactly controlled |
| TR201701968A2 (en) * | 2017-02-09 | 2018-08-27 | Ugur Beton Metal Ve Plastik Sanayi Turizm Ticaret Ltd Sirketi | PRESS BALANCE WEIGHT CONCRETE PRODUCTION METHOD |
| KR102048043B1 (en) * | 2017-06-14 | 2019-11-25 | 이숙희 | Elevator weight and method for manufacturing the same |
| CN111196694B (en) * | 2020-01-10 | 2021-07-27 | 丁雄标 | Production method for preparing elevator counterweight block by utilizing solid waste |
| CN111205029B (en) * | 2020-01-10 | 2021-11-23 | 丁雄标 | Material for preparing elevator counterweight block |
-
2020
- 2020-01-10 CN CN202010029528.7A patent/CN111196694B/en active Active
- 2020-09-12 WO PCT/CN2020/114928 patent/WO2021139202A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021139202A1 (en) | 2021-07-15 |
| CN111196694A (en) | 2020-05-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111196694B (en) | Production method for preparing elevator counterweight block by utilizing solid waste | |
| CN1853891A (en) | Production and automatic producer for building dry powder and mortar | |
| CN106957156A (en) | A kind of building castoff recycling treatment system method | |
| CN102976668A (en) | Method for producing aerated concrete building block by using fluorite tailings | |
| US3576655A (en) | Particulate material and shaped article made therefrom | |
| CN101412633A (en) | Method for preparing aerated concrete from phosphate slag | |
| CN111283386A (en) | Environment-friendly elevator counterweight block and preparation method thereof | |
| CN1480264A (en) | Method for treating inorganic solid waste and application | |
| CN111205029B (en) | Material for preparing elevator counterweight block | |
| KR100240754B1 (en) | A manufacturing method of counter weight for heavy equipment using blast oxygen furnace slag and scales | |
| CN212266203U (en) | Utilize production facility of solid waste preparation elevator balancing weight | |
| CN114133191A (en) | C50 high-performance concrete prepared from mixed sand and used for T beam pouring | |
| CN113318838A (en) | Steel smelting tailing treatment process | |
| CN111960808A (en) | Self-flowing castable prepared from blast furnace iron runner cover waste and preparation method thereof | |
| KR20050110435A (en) | Method and composite for cement brick, footpath block using waste sand, pebbles | |
| CN111574118A (en) | Construction waste recycling method | |
| KR100201237B1 (en) | Light weight aggregate using sand dust sludge method for preparing the same | |
| CN1263703C (en) | Weighting filler and making method thereof | |
| CN110372268B (en) | Macadam prepared from soil and comprehensive construction waste, preparation system and preparation method thereof | |
| CN108409281A (en) | A kind of nickel slag bake-free brick and preparation method thereof | |
| JP5019144B2 (en) | Counterweight for construction machinery and its recycling law | |
| KR100319532B1 (en) | Construction materials using steel making slag and used cast-iron sand | |
| CN110818370B (en) | Preparation method of all-solid-waste ecological slope protection brick | |
| GB1564600A (en) | Building block | |
| CN117341017A (en) | 3D printing balancing weight and preparation method thereof |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |