CN106116409A - A kind of waste residue that casts reclaims the non-burning brick of preparation - Google Patents
A kind of waste residue that casts reclaims the non-burning brick of preparation Download PDFInfo
- Publication number
- CN106116409A CN106116409A CN201610461344.1A CN201610461344A CN106116409A CN 106116409 A CN106116409 A CN 106116409A CN 201610461344 A CN201610461344 A CN 201610461344A CN 106116409 A CN106116409 A CN 106116409A
- Authority
- CN
- China
- Prior art keywords
- waste residue
- burning brick
- minutes
- casting waste
- bauxite
- 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.)
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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
- C04B28/14—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 containing calcium sulfate cements
- C04B28/142—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 containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—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 containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
-
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
- C04B24/045—Esters, e.g. lactones
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A kind of waste residue that casts of disclosure of the invention reclaims the non-burning brick of preparation, is made up of following component: gel rubber material, flyash, calcium phosphate, gangue, potter's clay, neck phthalic acid dibutyl ester, Paris white, bauxite, casting waste residue, water are appropriate.The present invention's is non-burning brick by potter's clay is coordinated the casting waste residue and gel rubber material added with the blended process of bauxite, while ensureing and improving non-burning brick intensity, reduce the incorporation of other aggregate, decrease the exploitation of mineral resources, reduce non-burning brick cost, production technology is simple, low cost, by the synergism between each material, make the non-burning brick intensity height of preparation, heat conductivity is low, effect of prestressed the best, energy-conserving and environment-protective, meet the needs of architectural engineering, meet the demand of environmental protection;By casting waste residue is recycled, decrease environmental pollution, protect ecological environment;The preparation method of the present invention had the most both been saved man-hour, had been saved the energy, reduced again cost.
Description
Technical field
The present invention relates to non-burning brick preparation field, particularly relate to a kind of waste residue that casts and reclaim the non-burning brick of preparation.
Background technology
Along with the increase day by day of china natural resources Yu ambient pressure, government department proposes the most in time and " realizes sustainable development
Exhibition, build a resource-conserving and environment-friendly society " requirement;Propose and " to guarantee the energy realizing determining in Eleventh-Five Year Plan
Consumption reduction by 20%, total emissions of major pollutants reduce 10% " target;And determine 2007 to start a new round " joint in the whole nation
Can reduce discharging " storm, it is also proposed that " energy-saving and emission-reduction " are the breaches that China transforms mode of economic growth, increases economic efficiency.And
The main garbage that alloy iron castings production process produces is antiquated sand, waste residue, dust and waste gas.Casting waste residue is cupola melting
During inevitable outcome, according to statistics, often produce 1t castings it is necessary to discharge waste residue about 300kg, whole nation foundry industry is every year altogether
Meter output waste residue about reaches 6,000,000 tons, if can not recycle, environment can cause destruction greatly;Existing unburned
Brick produces to be needed to consume substantial amounts of material, to bringing great pressure in all kinds of resources.
Summary of the invention
It is an object of the invention to provide a kind of waste residue that casts and reclaim the non-burning brick of preparation, be achieved through the following technical solutions:
A kind of waste residue that casts reclaims the non-burning brick of preparation, is made up of following component by weight: gel rubber material 52, flyash
10, calcium phosphate 0.5, gangue 3, potter's clay 2, neck phthalic acid dibutyl ester 0.1, Paris white 2, bauxite 3, casting waste residue 60,
Water is appropriate;
Described casting waste residue carries out process through in the following manner and screens:
1) casting waste residue is carried out 300 mesh particle filters, be unsatisfactory for this granularity, use ball mill pulverizer to carry out processing to granularity
Reach 300 mesh;
2) reach the casting waste residue of 300 mesh adds carbon dust and the bentonite mixtures of its quality 7% to granularity, after mix homogeneously,
Then carrying out roasting, sintering temperature is 756 DEG C, and roasting time is 78min, and described carbon dust and carbon dust in bentonite mixtures are with swollen
Profit soil is mixed by 3:1 mass ratio, and described bentonite mixes front through pretreatment with carbon dust: bentonite first adds to matter
Measure after the sulfuric acid solution that concentration is 6.4% soaks 20 minutes at 94 DEG C, filter, then use 267 DEG C of temperature calcination 40 points
Clock, is then directly appended in cold water, after soaking 10 minutes, filters, dries,;
3) the casting waste residue through calcination process carrying out magnetic separation, employing variation magnetic field, magnetic field, initial magnetic field intensity is set to
0.2T, high magnetic field intensity is set to 1.6T, from 0.2T, with 02T/10s speed be increased to 1.6T stop, then with
0.2T/5s speed drops to 0.2T and stops, and circulates successively;
4) can isolate two kinds of mixture after magnetic separation, one is ferric charge, and one is not ferric charge, collect not ferric charge with
Prepare non-burning brick being used;
Described gel rubber material is made up of following component by weight: ardealite 40, Calx 4, non-burning brick 14, epoxy resin 3,
Purple sweet potato starch 2;Described epoxy resin is through pretreatment: add acrylamide and the acrylic acid of its weight 1.2% in epoxy resin
Mixture, is heated to 84 DEG C, stirs 40 minutes with 180r/min speed, in described acrylamide and acrylic acid mixture
Acrylamide is mixed by 1:2 mass ratio with acrylic acid;
Described potter's clay processes through being blended with bauxite: potter's clay is the most admixed together with bauxite, uses 263 DEG C of temperature to forge
After burning 40 minutes, it is directly appended in cold water, soaks 20 minutes, refilter, be then added to the propylene that mass concentration is 2.98%
In acid solution, at 69 DEG C, after soaking 15 minutes, filter, washing, dry,.
The gangue of a kind of light weight high intensity is non-burning brick, is made up of step in detail below:
(1) mixed-powder of 200 mesh it is ground into after flyash, calcium phosphate, gangue, potter's clay and bauxite blend being mixed,
Stir 20 minutes with 500r/min speed;
(2) in (1), add neck phthalic acid dibutyl ester, Paris white, casting waste residue, stir, be subsequently adding comminutor
Middle extruding pelletization;
(3) granule prepared in (2) is mixed with Binder Materials, add water by the ratio of mud 0.218 and make mixed slurry, form cream
Shape thing, is then fed in block machine suppressing, and briquetting pressure controls for 17.5MPa;
(4) product after molding is placed at 25.8 DEG C watering maintenance 20 days,.
The present invention is through substantial amounts of experimentation, non-burning brick to the present invention by adding a small amount of neck phthalic acid dibutyl ester
Comprcssive strength after molding has strong influence, by series of experiment research, finds when neck phthalic acid dibutyl ester adds
When amount is 0.1 weight portion, the comprcssive strength after the non-burning brick molding of the present invention can be made to reach maximum, below or above this weight
Part, all can reduce the comprcssive strength after the non-burning brick molding of the present invention to a certain extent.
The present invention is through substantial amounts of experimentation, by the research to various gel rubber materials, thus prepares the present invention and exempts from
Bake bricks the gel rubber material used, coordinate casting non-burning brick every intensity of preparing of waste residue after treatment and resistance to water all to obtain
Arrive great raising, and under specific briquetting pressure and under specific curing temperature, it is possible to promote non-burning brick further
Combination property, prepared non-burning brick light weight, insulation, sound insulation, water absorption rate are low, energy-conserving and environment-protective, especially comprcssive strength obtain
Promote greatly, it is possible to meet the demand of more occasion.
The method have the benefit that the present invention's is non-burning brick by potter's clay is coordinated the casting added with the blended process of bauxite
Make waste residue and gel rubber material, while ensureing and improving non-burning brick intensity, reduce the incorporation of other aggregate, decrease ore deposit
Producing the exploitation of resource, reduce non-burning brick cost, production technology is simple, and low cost, by the synergism between each material, makes
The non-burning brick intensity that must prepare is high, heat conductivity is low, effect of prestressed the best, energy-conserving and environment-protective, meets the needs of architectural engineering, symbol
The demand that cyclization is protected;By casting waste residue is recycled, decrease environmental pollution, protect ecological environment;The system of the present invention
Preparation Method had the most both been saved man-hour, had been saved the energy, reduced again cost.
Detailed description of the invention
A kind of waste residue that casts reclaims the non-burning brick of preparation, is made up of following component by weight: gel rubber material 52, fine coal
Ash 10, calcium phosphate 0.5, gangue 3, potter's clay 2, neck phthalic acid dibutyl ester 0.1, Paris white 2, bauxite 3, casting waste residue
60, water is appropriate;
Described casting waste residue carries out process through in the following manner and screens:
1) casting waste residue is carried out 300 mesh particle filters, be unsatisfactory for this granularity, use ball mill pulverizer to carry out processing to granularity
Reach 300 mesh;
2) reach the casting waste residue of 300 mesh adds carbon dust and the bentonite mixtures of its quality 7% to granularity, after mix homogeneously,
Then carrying out roasting, sintering temperature is 756 DEG C, and roasting time is 78min, and described carbon dust and carbon dust in bentonite mixtures are with swollen
Profit soil is mixed by 3:1 mass ratio, and described bentonite mixes front through pretreatment with carbon dust: bentonite first adds to matter
Measure after the sulfuric acid solution that concentration is 6.4% soaks 20 minutes at 94 DEG C, filter, then use 267 DEG C of temperature calcination 40 points
Clock, is then directly appended in cold water, after soaking 10 minutes, filters, dries,;
3) the casting waste residue through calcination process carrying out magnetic separation, employing variation magnetic field, magnetic field, initial magnetic field intensity is set to
0.2T, high magnetic field intensity is set to 1.6T, from 0.2T, with 02T/10s speed be increased to 1.6T stop, then with
0.2T/5s speed drops to 0.2T and stops, and circulates successively;
4) can isolate two kinds of mixture after magnetic separation, one is ferric charge, and one is not ferric charge, collect not ferric charge with
Prepare non-burning brick being used;
Described gel rubber material is made up of following component by weight: ardealite 40, Calx 4, non-burning brick 14, epoxy resin 3,
Purple sweet potato starch 2;Described epoxy resin is through pretreatment: add acrylamide and the acrylic acid of its weight 1.2% in epoxy resin
Mixture, is heated to 84 DEG C, stirs 40 minutes with 180r/min speed, in described acrylamide and acrylic acid mixture
Acrylamide is mixed by 1:2 mass ratio with acrylic acid;
Described potter's clay processes through being blended with bauxite: potter's clay is the most admixed together with bauxite, uses 263 DEG C of temperature to forge
After burning 40 minutes, it is directly appended in cold water, soaks 20 minutes, refilter, be then added to the propylene that mass concentration is 2.98%
In acid solution, at 69 DEG C, after soaking 15 minutes, filter, washing, dry,.
The gangue of a kind of light weight high intensity is non-burning brick, is made up of step in detail below:
(1) mixed-powder of 200 mesh it is ground into after flyash, calcium phosphate, gangue, potter's clay and bauxite blend being mixed,
Stir 20 minutes with 500r/min speed;
(2) in (1), add neck phthalic acid dibutyl ester, Paris white, casting waste residue, stir, be subsequently adding comminutor
Middle extruding pelletization;
(3) granule prepared in (2) is mixed with Binder Materials, add water by the ratio of mud 0.218 and make mixed slurry, form cream
Shape thing, is then fed in block machine suppressing, and briquetting pressure controls for 17.5MPa;
(4) product after molding is placed at 25.8 DEG C watering maintenance 20 days,.
And resisted non-burning brick heat conductivity, comprcssive strength by casting waste residue additions different in the experimentation present invention
The impact of folding intensity:
Casting waste residue adds weight portion | Heat conductivity W/ (m.K) | Rupture strength MPa | Comprcssive strength Mpa |
50 | 0.064 | 2.9 | 15.7 |
55 | 0.060 | 3.2 | 17.8 |
60 | 0.052 | 3.8 | 19.6 |
65 | 0.058 | 3.6 | 18.6 |
70 | 0.062 | 3.3 | 18.2 |
Table 1
As can be seen from Table 1, the addition casting waste residue in the present invention to a certain extent is the most, non-burning brick comprcssive strength and
Rupture strength is the biggest, and heat conductivity is the lowest, the addition more than 60 parts, and its comprcssive strength and rupture strength start to reduce, heat conduction
Coefficient starts to raise.
In the present invention, potter's clay and bauxite are 0.056W/ without blended process, the non-burning brick heat conductivity made
(m.K), comprcssive strength is 18.2Mpa, and rupture strength is 3.4MPa, hence it is evident that poorer than non-burning brick performance prepared by the present invention.
The non-burning brick heat conductivity made without neck phthalic acid dibutyl ester in the present invention is 0.053W/ (m.K), resistance to compression
Intensity is 16.4Mpa, and rupture strength is 3.7MPa;That adds that the neck phthalic acid dibutyl ester of 0.2 weight portion makes non-burning brick leads
Hot coefficient is 0.052W/ (m.K), and comprcssive strength is 18.8Mpa, and rupture strength is 3.8MPa;Add the neck benzene of 0.08 weight portion
The non-burning brick heat conductivity that dibutyl carboxylic acid is made is 0.053W/ (m.K), and comprcssive strength is 18.0Mpa, and rupture strength is
3.7MPa;Non-burning brick heat conductivity and rupture strength that the present invention is prepared by the addition of visible neck phthalic acid dibutyl ester affect
Not quite, on comprcssive strength impact substantially.
Claims (2)
1. one kind casts the non-burning brick of waste residue recovery preparation, it is characterised in that be made up of following component by weight: gel material
Material 52, flyash 10, calcium phosphate 0.5, gangue 3, potter's clay 2, neck phthalic acid dibutyl ester 0.1, Paris white 2, bauxite 3,
Casting waste residue 60, water are appropriate;
Described casting waste residue carries out process through in the following manner and screens:
1) casting waste residue is carried out 300 mesh particle filters, be unsatisfactory for this granularity, use ball mill pulverizer to carry out processing to granularity
Reach 300 mesh;
2) reach the casting waste residue of 300 mesh adds carbon dust and the bentonite mixtures of its quality 7% to granularity, after mix homogeneously,
Then carrying out roasting, sintering temperature is 756 DEG C, and roasting time is 78min, and described carbon dust and carbon dust in bentonite mixtures are with swollen
Profit soil is mixed by 3:1 mass ratio, and described bentonite mixes front through pretreatment with carbon dust: bentonite first adds to matter
Measure after the sulfuric acid solution that concentration is 6.4% soaks 20 minutes at 94 DEG C, filter, then use 267 DEG C of temperature calcination 40 points
Clock, is then directly appended in cold water, after soaking 10 minutes, filters, dries,;
3) the casting waste residue through calcination process carrying out magnetic separation, employing variation magnetic field, magnetic field, initial magnetic field intensity is set to
0.2T, high magnetic field intensity is set to 1.6T, from 0.2T, with 02T/10s speed be increased to 1.6T stop, then with
0.2T/5s speed drops to 0.2T and stops, and circulates successively;
4) can isolate two kinds of mixture after magnetic separation, one is ferric charge, and one is not ferric charge, collect not ferric charge with
Prepare non-burning brick being used;
Described gel rubber material is made up of following component by weight: ardealite 40, Calx 4, non-burning brick 14, epoxy resin 3,
Purple sweet potato starch 2;Described epoxy resin is through pretreatment: add acrylamide and the acrylic acid of its weight 1.2% in epoxy resin
Mixture, is heated to 84 DEG C, stirs 40 minutes with 180r/min speed, in described acrylamide and acrylic acid mixture
Acrylamide is mixed by 1:2 mass ratio with acrylic acid;
Described potter's clay processes through being blended with bauxite: potter's clay is the most admixed together with bauxite, uses 263 DEG C of temperature to forge
After burning 40 minutes, it is directly appended in cold water, soaks 20 minutes, refilter, be then added to the propylene that mass concentration is 2.98%
In acid solution, at 69 DEG C, after soaking 15 minutes, filter, washing, dry,.
2. the gangue according to light weight high intensity a kind of described in claim 1 is non-burning brick, it is characterised in that by walking in detail below
Suddenly make:
(1) mixed-powder of 200 mesh it is ground into after flyash, calcium phosphate, gangue, potter's clay and bauxite blend being mixed,
Stir 20 minutes with 500r/min speed;
(2) in (1), add neck phthalic acid dibutyl ester, Paris white, casting waste residue, stir, be subsequently adding comminutor
Middle extruding pelletization;
(3) granule prepared in (2) is mixed with Binder Materials, add water by the ratio of mud 0.218 and make mixed slurry, form cream
Shape thing, is then fed in block machine suppressing, and briquetting pressure controls for 17.5MPa;
(4) product after molding is placed at 25.8 DEG C watering maintenance 20 days,.
Priority Applications (1)
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CN201610461344.1A CN106116409A (en) | 2016-06-23 | 2016-06-23 | A kind of waste residue that casts reclaims the non-burning brick of preparation |
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CN201610461344.1A CN106116409A (en) | 2016-06-23 | 2016-06-23 | A kind of waste residue that casts reclaims the non-burning brick of preparation |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109180135A (en) * | 2018-09-27 | 2019-01-11 | 佛山齐安建筑科技有限公司 | A kind of preparation method of ardealite base base light-weight brick exempt from baking |
CN109251057A (en) * | 2018-11-21 | 2019-01-22 | 魏林涛 | A kind of maintenance process of slag baking-free water-permeable brick |
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CN102211896A (en) * | 2010-04-06 | 2011-10-12 | 宁国市创新建材有限公司 | Baking-free brick and preparation method thereof |
CN102586585A (en) * | 2011-10-25 | 2012-07-18 | 内蒙古科技大学 | Method for recovering iron from ferriferous tailings |
CN103468936A (en) * | 2013-08-15 | 2013-12-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Difficult-separation iron ore tailing pelletizing rotary kiln magnetic roasting treatment technology |
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KR20000053823A (en) * | 2000-04-21 | 2000-09-05 | 노상화 | The method and apparatus for manufacturing of building meterials using indutrial waste |
CN1322687A (en) * | 2001-07-02 | 2001-11-21 | 李毅 | Non-fired building brick |
CN102211896A (en) * | 2010-04-06 | 2011-10-12 | 宁国市创新建材有限公司 | Baking-free brick and preparation method thereof |
CN102586585A (en) * | 2011-10-25 | 2012-07-18 | 内蒙古科技大学 | Method for recovering iron from ferriferous tailings |
CN103468936A (en) * | 2013-08-15 | 2013-12-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Difficult-separation iron ore tailing pelletizing rotary kiln magnetic roasting treatment technology |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109180135A (en) * | 2018-09-27 | 2019-01-11 | 佛山齐安建筑科技有限公司 | A kind of preparation method of ardealite base base light-weight brick exempt from baking |
CN109251057A (en) * | 2018-11-21 | 2019-01-22 | 魏林涛 | A kind of maintenance process of slag baking-free water-permeable brick |
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