CN110526737A - A kind of bastard coal ground mass slug type water-permeable brick and preparation method thereof - Google Patents
A kind of bastard coal ground mass slug type water-permeable brick and preparation method thereof Download PDFInfo
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- CN110526737A CN110526737A CN201910838070.7A CN201910838070A CN110526737A CN 110526737 A CN110526737 A CN 110526737A CN 201910838070 A CN201910838070 A CN 201910838070A CN 110526737 A CN110526737 A CN 110526737A
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- gangue
- clay
- permeable brick
- water
- expanded perlite
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- 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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
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- 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
- C04B33/00—Clay-wares
- C04B33/32—Burning methods
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- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
- C04B38/0645—Burnable, meltable, sublimable materials
- C04B38/068—Carbonaceous materials, e.g. coal, carbon, graphite, hydrocarbons
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- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/08—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
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- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention discloses a kind of bastard coal ground mass slug type water-permeable bricks and preparation method thereof, are related to industrial solid castoff processing and permeable pavement field of material technology.The gangue and clay that the present invention is 30%~70% with mass percent mix, and the water of mixture 10% is added, expanded perlite is added according to the 30%~150% of mixture volume, compression moulding and drying by mixing, after mixing evenly under omnipotent pressure testing machine, are finally putting into high temperature sintering furnace and fire finished product.The present invention is aided with clay with Coal Refuse and prepares slug type water-permeable brick, make full use of the carbon in gangue as high-temperature foaming agent, and the pore-creating effect of expanded perlite at high temperature, the structure of finished product water-permeable brick is adjusted by the gradation of gangue, clay and expanded perlite, the water-permeable brick water permeability produced is good, tensile splitting strength is high, high efficiency at low cost, suitable for the permeable pavement structure of pavement, square, cell etc. and road surface.
Description
Technical field
The present invention relates to industrial solid castoff processing and permeable pavement field of material technology, and in particular to a kind of gangue
Base slug type water-permeable brick and preparation method thereof, the water-permeable brick water permeability that thus method is produced is preferable, and tensile splitting strength is high,
High efficiency at low cost, suitable for the permeable pavement structure of pavement, square, cell etc. and road surface.
Background technique
Currently, the acceleration of the urbanization process with China, environmental pollution and problem of resource waste aggravation, while green is raw
State problem and economic development problem are gradually widely paid close attention to by people.Water scarcity becomes a big danger of urban development
Machine, solve the problems, such as city disaster-ridden more floods be also current city one greatly there is an urgent need to.And ever-increasing city demand and ring
Border demand becomes the theme that we study.Government is conceived to the construction in " sponge city ", and indicates the side for building such city
Method and road.The proposal of " sponge city " concept is to develop scientific and technological forum by low-carbon environment-friendly and City Green for the first time at 2012 4
The moon proposes.2014, national correlation department formally promulgated the action index and technology path policy about sponge urban construction,
The policy main points in construction sponge city are definitely summarised with six aspects: " use is permeated, and is saved, purification, is stagnated and is discharged ".
In March, 2017, national government urban construction work report formally propose that phenomena shows China about construction " sponge city "
It will put expertise to good use in terms of construction " sponge city ".
The construction in sponge city will not only adapt to the ecosystem of macroscopic aspect, also comply in microcosmic point " cavernous body "
Implementation, i.e., the infrastructure device made full use of based on various environmental and ecological, water resources.Wherein, using water penetration spreading bricks road
Face and ground are one of major ways.The main material on permeability floor is permeable material, and rainwater can penetrate its interconnected pores
Gap.Compared with common rigid road pavement brick body material, the road pavement brick body material with water penetration can effectively reduce rain
Water packing phenomenon weakens city turbulent phenomenon, the circulation of rainwater is promoted to discharge, and purification stores and for used in city.Due to having
The material of water penetration has more hole ducts, and air themperature is higher, and is air-dried, therefore such material absorbable is deposited
Rainwater in bottom is stored up, since capillarity is in earth's surface, by water evaporation regulating and controlling temperature, to reduce city heat.This
Outside, the material with cellular structure can reduce city noise pollution with flat noise reduction.
Water-permeable brick is a kind of and other brick different function bricks, it will not only have certain intensity, but also should have
There is good breathable and permeable function.The continuous development of urbanization, the preferable permeable brick of selection have become very important
Problem.Water-permeable brick is a kind of ecological environment-friendly type water-permeable brick, and major advantage has the following aspects: protection groundwater resources improve
Urban Heat Environment, improvement urban surface ecological environment, absorption city noise etc..
Gangue is the solid waste of generation release during exploiting colliery and coal washing, is one kind in coal forming process
In the lower grey black rock of a kind of phosphorus content with coal seam and smoke stratification association, mainly by sandstone, dunn bass, arenaceous shale,
The composition such as culm and coal.There is also differences in constituent structure, physical and chemical performance for the gangue of different regions, generally with
Geological structure, generation age and region location are related.The chemical composition and comparison of ingredients of gangue are complicated, mainly contain Al and Si,
Also contain many other elements, usually oxide form, such as SiO2, Fe2O3, Al2O3, Na2O, MgO, CaO, there are also a small amount of
Rare element, such as Be, B, Ni etc..For the mineralogical composition of gangue based on clay mineral and quartz, common minerals are feldspar, kaolinite
Soil, illite, quartz, mica, chlorite and smectites, other than quartz and feldspar, most of is all the silicon of layer structure
Hydrochlorate.The mineralogical composition and physical and chemical composition of gangue determine its physicochemical properties and performance, also determine that it can be filled
Divide the value utilized.
Summary of the invention
It is existing to solve the purpose of the present invention is to provide a kind of bastard coal ground mass slug type water-permeable brick and preparation method thereof
Permeable pavement materials demand amount is big and the problem of solid waste resource recovery utilization rate deficiency.
To achieve the above object, the present invention provides a kind of bastard coal ground mass slug type water-permeable brick and preparation method thereof.The present invention
Have the advantages that the water-permeable brick of preparation takes full advantage of the carbon in gangue as foaming agent, expanded perlite is as pore-creating
Agent, so that the water-permeable brick water permeability produced is preferable, tensile splitting strength is high, high efficiency at low cost, suitable for pavement, extensively
The permeable pavement structure of field, cell etc. and road surface.
Detailed description of the invention
Fig. 1 is the bastard coal ground mass water-permeable brick preparation technology flow chart that 1-5 of the embodiment of the present invention is provided.
Fig. 2 is the bastard coal ground mass water-permeable brick sintering period curve graph that the embodiment of the present invention 3 provides.
Fig. 3 is the bastard coal ground mass water-permeable brick SEM photograph that the embodiment of the present invention 1 provides.
Fig. 4 is the bastard coal ground mass water-permeable brick XRD spectrum that the embodiment of the present invention 4 provides.
Fig. 5 is the performance chart of slug type water-permeable brick under the different firing temperatures that 2-4 of the embodiment of the present invention is provided.
Fig. 6 is the performance chart of slug type water-permeable brick under the different ratios of raw materials that the embodiment of the present invention 1 provides.
Fig. 7 is the performance chart of slug type water-permeable brick under the different expanded perlite volumes that the embodiment of the present invention 5 provides.
Specific embodiment
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..
Embodiment 1
Using gangue, clay, expanded perlite as raw material, gangue and clay mass percent are respectively 30% He
70%, expanded perlite is the 60% of gangue and clay total volume.Firstly, coal shale in brick making is put into ball mill or vibromill
Interior carry out crushing grinding screens out coal shale in brick making using 50 mesh sieve, the coal after screening after coal shale in brick making fine uniform
Spoil raw material is put into thermostatic drying chamber at 100 DEG C dry 2h.After the raw materials such as gangue, clay and expanded perlite are mixed
Water-permeable brick blank, briquetting pressure 25MPa, pressure maintaining 30s are prepared using hydrostatic profile technique.After demoulding is taken out, by molding base
Material carries out natural curing for 24 hours, is put into thermostatic drying chamber at 100 DEG C dry 2h later until blank is completely dried.It will dry
Adobe afterwards, which is put into high temperature sintering furnace, to be sintered, and sintering temperature is 1050 DEG C, and the sintering period is 5~6h, is then dropped with furnace
Temperature.Specific sintering temperature system is to rise to 100 DEG C from room temperature first, heating rate is 10 DEG C/min, then again with 5 DEG C/min
Heating rate rise to 600 DEG C from 100 DEG C, keep the temperature 60min, rise to sintering temperature from 600 DEG C with the heating rate of 5 DEG C/min later
1050 DEG C of degree.After reaching sintering temperature, cool down after heat preservation 60min with furnace.Prepared bastard coal ground mass slug type water-permeable brick is saturating
Water coefficient is 6.4 × 10-3Cm/s, tensile splitting strength 5.25MPa.
Embodiment 2
Using gangue, clay, expanded perlite as raw material, gangue and clay mass percent are respectively 50% He
50%, expanded perlite is the 60% of gangue and clay total volume.Firstly, coal shale in brick making is put into ball mill or vibromill
Interior carry out crushing grinding screens out coal shale in brick making using 50 mesh sieve, the coal after screening after coal shale in brick making fine uniform
Spoil raw material is put into thermostatic drying chamber at 100 DEG C dry 2h.After the raw materials such as gangue, clay and expanded perlite are mixed
Water-permeable brick blank, briquetting pressure 25MPa, pressure maintaining 30s are prepared using hydrostatic profile technique.After demoulding is taken out, by molding base
Material carries out natural curing for 24 hours, is put into thermostatic drying chamber at 100 DEG C dry 2h later until blank is completely dried.It will dry
Adobe afterwards, which is put into high temperature sintering furnace, to be sintered, and sintering temperature is 1050 DEG C, and the sintering period is 5~6h, is then dropped with furnace
Temperature.Specific sintering temperature system is to rise to 100 DEG C from room temperature first, heating rate is 10 DEG C/min, then again with 5 DEG C/min
Heating rate rise to 600 DEG C from 100 DEG C, keep the temperature 60min, rise to sintering temperature from 600 DEG C with the heating rate of 5 DEG C/min later
1050 DEG C of degree.After reaching sintering temperature, cool down after heat preservation 60min with furnace.Prepared bastard coal ground mass slug type water-permeable brick is saturating
Water coefficient is 3.52 × 10-3Cm/s, tensile splitting strength 1.83MPa.
Embodiment 3
Using gangue, clay, expanded perlite as raw material, gangue and clay mass percent are respectively 50% He
50%, expanded perlite is the 60% of gangue and clay total volume.Firstly, coal shale in brick making is put into ball mill or vibromill
Interior carry out crushing grinding screens out coal shale in brick making using 50 mesh sieve, the coal after screening after coal shale in brick making fine uniform
Spoil raw material is put into thermostatic drying chamber at 100 DEG C dry 2h.After the raw materials such as gangue, clay and expanded perlite are mixed
Water-permeable brick blank, briquetting pressure 25MPa, pressure maintaining 30s are prepared using hydrostatic profile technique.After demoulding is taken out, by molding base
Material carries out natural curing for 24 hours, is put into thermostatic drying chamber at 100 DEG C dry 2h later until blank is completely dried.It will dry
Adobe afterwards, which is put into high temperature sintering furnace, to be sintered, and sintering temperature is 1000 DEG C, and the sintering period is 5~6h, is then dropped with furnace
Temperature.Specific sintering temperature system is to rise to 100 DEG C from room temperature first, heating rate is 10 DEG C/min, then again with 5 DEG C/min
Heating rate rise to 600 DEG C from 100 DEG C, keep the temperature 60min, rise to sintering temperature from 600 DEG C with the heating rate of 5 DEG C/min later
1000 DEG C of degree.After reaching sintering temperature, cool down after heat preservation 60min with furnace.Prepared bastard coal ground mass slug type water-permeable brick is saturating
Water coefficient is 2.35 × 10-3Cm/s, tensile splitting strength 0.73MPa.
Embodiment 4
Using gangue, clay, expanded perlite as raw material, gangue and clay mass percent are respectively 50% He
50%, expanded perlite is the 60% of gangue and clay total volume.Firstly, coal shale in brick making is put into ball mill or vibromill
Interior carry out crushing grinding screens out coal shale in brick making using 50 mesh sieve, the coal after screening after coal shale in brick making fine uniform
Spoil raw material is put into thermostatic drying chamber at 100 DEG C dry 2h.After the raw materials such as gangue, clay and expanded perlite are mixed
Water-permeable brick blank, briquetting pressure 25MPa, pressure maintaining 30s are prepared using hydrostatic profile technique.After demoulding is taken out, by molding base
Material carries out natural curing for 24 hours, is put into thermostatic drying chamber at 100 DEG C dry 2h later until blank is completely dried.It will dry
Adobe afterwards, which is put into high temperature sintering furnace, to be sintered, and sintering temperature is 1100 DEG C, and the sintering period is 5~6h, is then dropped with furnace
Temperature.Specific sintering temperature system is to rise to 100 DEG C from room temperature first, heating rate is 10 DEG C/min, then again with 5 DEG C/min
Heating rate rise to 600 DEG C from 100 DEG C, keep the temperature 60min, rise to sintering temperature from 600 DEG C with the heating rate of 5 DEG C/min later
1100 DEG C of degree.After reaching sintering temperature, cool down after heat preservation 60min with furnace.Prepared bastard coal ground mass slug type water-permeable brick is saturating
Water coefficient is 1.23 × 10-3Cm/s, tensile splitting strength 2.32MPa.
Embodiment 5
Using gangue, clay, expanded perlite as raw material, gangue and clay mass percent are respectively 50% He
50%, expanded perlite is the 90% of gangue and clay total volume.Firstly, coal shale in brick making is put into ball mill or vibromill
Interior carry out crushing grinding screens out coal shale in brick making using 50 mesh sieve, the coal after screening after coal shale in brick making fine uniform
Spoil raw material is put into thermostatic drying chamber at 100 DEG C dry 2h.After the raw materials such as gangue, clay and expanded perlite are mixed
Water-permeable brick blank, briquetting pressure 25MPa, pressure maintaining 30s are prepared using hydrostatic profile technique.After demoulding is taken out, by molding base
Material carries out natural curing for 24 hours, is put into thermostatic drying chamber at 100 DEG C dry 2h later until blank is completely dried.It will dry
Adobe afterwards, which is put into high temperature sintering furnace, to be sintered, and sintering temperature is 1100 DEG C, and the sintering period is 5~6h, is then dropped with furnace
Temperature.Specific sintering temperature system is to rise to 100 DEG C from room temperature first, heating rate is 10 DEG C/min, then again with 5 DEG C/min
Heating rate rise to 600 DEG C from 100 DEG C, keep the temperature 60min, rise to sintering temperature from 600 DEG C with the heating rate of 5 DEG C/min later
1100 DEG C of degree.After reaching sintering temperature, cool down after heat preservation 60min with furnace.Prepared bastard coal ground mass slug type water-permeable brick is saturating
Water coefficient is 1.42 × 10-2Cm/s, tensile splitting strength 4.25MPa.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (5)
1. a kind of bastard coal ground mass slug type water-permeable brick and preparation method thereof, it is characterised in that: the following steps are included:
(1), by gangue crushing grinding, 35 meshes are crossed, obtained Coal gangue powder is spare；
(2), gangue, clay and expanded perlite are mixed by setting raw material proportioning, adds water and stirs, stirs after mixing
Mixing is aged for 24 hours after mixing uniformly；
(3), the mixing that ageing terminates is put into mold, with the briquetting pressure of 25MPa by mixing under omnipotent pressure testing machine
Compression moulding obtains adobe；
(4), brick bat drying, 60 DEG C of drying temperature, drying time 1h；
(5), the adobe after drying is put into high temperature sintering furnace and is sintered, 1000 DEG C~1100 DEG C of sintering temperature, when sintering
Between 5~6h, then cool down with furnace.
2. a kind of bastard coal ground mass slug type water-permeable brick according to claim 1 and preparation method thereof, it is characterised in that: with coal
Spoil, clay, expanded perlite are raw material, are formed by a firing by formula as below:
Gangue 30%~70%；
Clay 30%~70%；
Expanded perlite 30%~150%；
Wherein, gangue, clay are mass percent, and total mass of raw material adds up to 100%；Expanded perlite is volume basis
Than being the percentage of gangue and clay total volume.
3. a kind of bastard coal ground mass slug type water-permeable brick according to claim 1 and preparation method thereof, it is characterised in that: preparation
Gangue mass percent used in water-permeable brick is 30%~70%, and clay 30%~70%, the two is mixed into quality after mixing
Percentage is 100%.
4. a kind of bastard coal ground mass slug type water-permeable brick according to claim 1 and preparation method thereof, it is characterised in that: step
(2) in, the expanded perlite percent by volume is 30%~150%, 50 mesh of particle size range~100 mesh.
5. a kind of bastard coal ground mass slug type water-permeable brick according to claim 1 and preparation method thereof, it is characterised in that: step
(5) in, the sintering period be 5~6h, rise to 100 DEG C from room temperature first, heating rate is about 10 DEG C/min, then again with 5 DEG C/
The heating rate of min rises to 600 DEG C from 100 DEG C, keeps the temperature 60min, is then risen to the heating rate of about 5 DEG C/min from 600 DEG C
The sintering temperature of experimental program setting, wherein sintering temperature is respectively 1000,1050,1100 DEG C；After reaching sintering temperature, heat preservation
60min then cools down with furnace.
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| CN201910838070.7A CN110526737A (en) | 2019-09-05 | 2019-09-05 | A kind of bastard coal ground mass slug type water-permeable brick and preparation method thereof |
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| CN201910838070.7A CN110526737A (en) | 2019-09-05 | 2019-09-05 | A kind of bastard coal ground mass slug type water-permeable brick and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111484352A (en) * | 2020-04-23 | 2020-08-04 | 北京诠道科技有限公司 | Light heat-insulating brick and preparation method thereof |
| CN113816724A (en) * | 2021-10-19 | 2021-12-21 | 山西富鸿科技开发有限公司 | Coal gangue sandstone sponge brick and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106747619A (en) * | 2016-11-30 | 2017-05-31 | 太原理工大学 | Sintered coal gangue expanded perlite water-permeable brick and preparation method thereof |
-
2019
- 2019-09-05 CN CN201910838070.7A patent/CN110526737A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106747619A (en) * | 2016-11-30 | 2017-05-31 | 太原理工大学 | Sintered coal gangue expanded perlite water-permeable brick and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111484352A (en) * | 2020-04-23 | 2020-08-04 | 北京诠道科技有限公司 | Light heat-insulating brick and preparation method thereof |
| CN111484352B (en) * | 2020-04-23 | 2022-07-08 | 北京诠道科技有限公司 | Light heat-insulating brick and preparation method thereof |
| CN113816724A (en) * | 2021-10-19 | 2021-12-21 | 山西富鸿科技开发有限公司 | Coal gangue sandstone sponge brick and preparation method thereof |
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Application publication date: 20191203 |