CN110229014A - A kind of lightweight aggregate and preparation method thereof being prepared using steel mill's sludge - Google Patents
A kind of lightweight aggregate and preparation method thereof being prepared using steel mill's sludge Download PDFInfo
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- CN110229014A CN110229014A CN201910567255.9A CN201910567255A CN110229014A CN 110229014 A CN110229014 A CN 110229014A CN 201910567255 A CN201910567255 A CN 201910567255A CN 110229014 A CN110229014 A CN 110229014A
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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
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/027—Lightweight materials
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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
- C04B33/1321—Waste slurries, e.g. harbour sludge, industrial muds
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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
- C04B33/135—Combustion residues, e.g. fly ash, incineration waste
- C04B33/1352—Fuel ashes, e.g. fly ash
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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
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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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
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Dispersion Chemistry (AREA)
- Civil Engineering (AREA)
- Combustion & Propulsion (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a kind of lightweight aggregates, aggregate is prepared using steel mill's sludge as raw material, composition of raw materials is 10~40% steel mill's sludge and 60~90% flyash, specific preparation method the following steps are included: steel mill's sludge after drying, smashing and grinding, sieving, the flyash that sieving is added presses certain weight ratio pelletizing after mixing, by the dry progress after a certain period of time of raw material ball and heat treatment, aggregate finished product is obtained after being finally sintered and cooled.The resulting lightweight aggregate of the present invention has the characteristics that small high intensity, density, good heat insulating, water absorption rate are low, there must be the lightweight aggregate of certain heat insulating ability merely with sludge and coal ash for manufacturing, raw material is solid waste, and realization is turned waste into wealth, it is energy saving and environmentally friendly, while reduction prepares the cost of aggregate.
Description
Technical field
The field more particularly to a kind of utilization steel mill's sludge recycled the present invention relates to metallurgical solid waste is prepared
Lightweight aggregate and preparation method thereof.
Background technique
With the rapid development of social science and technology, the raising of social productive forces accelerates the development of modernization, at the same time,
Bring ecological environment problem.A large amount of exploitations of natural resources, not only cause non-renewable resources especially in industrial circle
Reduction, also cause the accumulation of a large amount of solid waste, occupy limited land resource or even will cause secondary pollution.
Therefore, it is carried out according to the characteristic of solid waste rationally utilizing and is had important practical significance.
The sludge of steel mill is by waste water of steel plants and sanitary sewage by the processed solid sediment of recycle-water factory, and sludge is made
Processing mode band is given because of the features such as its source is wide, complicated component, yield are big, foul smelling taste for the typical solid waste of steel mill
Carry out significant limitation.In terms of main component, steel mill's sludge belongs to inorganic sludge, for this inorganic sludge, conventional processing
Mode is mainly stacked and landfill, and stacking is exactly that the wasteland abandoned is not processed, and filling is grown up from traditional stacking
One disposal technology realizes organic matter degradation using microbial activities after compacting filling soil, makes a kind of its stabilized processing
Mode.Both processing modes essentially only dispose the decrement of sludge, and there is no carry out sufficiently benefit to its valuable constituent
With in addition to this, two ways is also possible to bring the secondary pollution of environment.In contrast, sufficiently benefit is utilized to recycling sludge
With the valuable constituent of sludge, turn waste into wealth while meeting environmental benefit.
It is and most of from ingredient based on the inorganic matter that the ingredient of sludge is mainly formed with elements such as calcium, aluminium, iron, silicon
The material composition of construction material is close, and wherein heavy metal element can be carried out by preparing building material product using the high temperature sintering of sludge
Curing process, avoids the secondary pollution of environment, therefore can be applied to aggregate, cement somehow waiting.Wherein light bone is prepared using sludge
Material has more wide prospect, and lightweight aggregate is that a kind of bulk density is less than or equal to 1200kg/m3Aggregate, by partial size difference
It is divided into thin lightweight aggregate and thick lightweight aggregate again, lightweight aggregate of the partial size less than 5mm is known as thin lightweight aggregate, and partial size is greater than the lightweight aggregate of 5mm
Referred to as thick lightweight aggregate, by sources difference can be divided into artificial lightweight aggregate, natural weight aggregate, 3 class of industrial residue lightweight aggregate, general artificial
Lightweight aggregate is using non-renewable resources such as clay, shale, but a large amount of exploitation non-renewable resources prepare aggregate and do not meet China
National conditions, thus the similar ingredient of utilization sludge prepares high performance artificial lightweight aggregate instead of non-renewable resources and becomes in industry urgently
Technical problem to be solved.
It, should although disclosing a kind of method for preparing porcelain granule light weight aggregate using sludge in patent CN100584794C
Method uses, and steel sludge is made in lightweight aggregate, and the cylindrical compress strength of obtained lightweight aggregate does not meet GB/ less than 6.0
The requirement of T17431.2-1998.Thus, those skilled in the art have reason to suspect, the method in patent CN100584794C is simultaneously
Not all sludge can be applicable in.
In this regard, those skilled in the art is dedicated to developing one kind using steel mill's sludge as the obtained lightweight aggregate of raw material, the light bone
Material has the characteristics that density is small, intensity is high, water absorption rate is low and good with cement caking property.
Summary of the invention
In view of the above drawbacks of the prior art, the technical problem to be solved by the present invention is to how utilize steel mill's sludge work
Raw material is obtained, and density is small, intensity is high, water absorption rate is low and the lightweight aggregate good with cement caking property.
To achieve the above object, the present invention provides a kind of lightweight aggregate, the raw material of the lightweight aggregate includes industrial sludge and powder
Coal ash, according to weight ratio, industrial sludge accounting weighs 10%~40%, and flyash accounting weighs 60%~90%, and industrial sludge contains
Water rate is 45~55%.
Further, industrial sludge derives from steel mill or power plant, and the ingredient in industrial sludge includes CaCO335~40%,
SiO25~10%, FeO 20~23%, Al2O38~12%, SiC 7~8%, ZnO 1~2%, MgO 3~5%, by matter
Measure score meter.
Further, according to weight ratio, industrial sludge accounting weighs 20%, and flyash accounting weighs 80%.
Further, lightweight aggregate is raw material ball, and there are multiple closed holes in the inside of raw material ball, and the diameter of raw material ball is
10-15mm。
Further, the cylindrical compress strength of lightweight aggregate is 8.0~9.6Mpa, bulk density 793kg/m3~987kg/m3, inhale
Water rate is 4.3%~20%.
The present invention also provides a kind of method for preparing lightweight aggregate, the raw material of lightweight aggregate includes industrial sludge and flyash, side
Method includes the following steps:
(1) industrial sludge that moisture content is 45%~55% is dried at 100~110 DEG C 20~30h, will done after the completion
Dry industrial sludge and flyash grinds respectively, crosses 200 mesh sieve below；
(2) obtained sewage sludge powder, flyash powder will be handled by step (1) by weight mixing, sewage sludge powder accounts for
Specific gravity 10%~40%, flyash powder accounting weigh 60%~90%, and stirring forms mixing；
(3) 2~4kg of mixing of step (2) is taken to pour into pelletizer, then water spray charging alternately, pelletizer 70~
The raw material ball of 10-15mm is obtained after 2330~2240 circle of rotation in 75min；
(4) raw material ball of step (3) is put into drying box, dry 60~90min at 100~110 DEG C；In order to remove life
Partial moisture in pellet prevents occurring the phenomenon that blastomere in roasting process；
(5) raw material ball that step (4) processing obtains is preheated into 20~30min at 300~500 DEG C, before reducing sintering
The content of organic matter and carbon in raw material ball；
(6) raw material ball of step (5) the pre-heat treatment is roasted into 20~30min at 1050~1200 DEG C, raw material ball is gradually
Vitrifying, aggregate is formed after cooling.
Further, the average particle size of sewage sludge powder that step (1) processing obtains is 8~10um, flyash powder it is flat
Equal granularity is 13~15um.
Further, the raw material ball that step (4) processing obtains is heated to the heating rate of 10 DEG C/min in step (5)
300 DEG C, 20min is kept the temperature at 300 DEG C.
Further, the raw material ball of step (5) the pre-heat treatment is risen to the heating rate of 5 DEG C/min in step (6)
1050 DEG C, 25min is roasted at 1050 DEG C.
Further, industrial sludge derives from steel mill or power plant, and the ingredient in industrial sludge includes CaCO335~40%,
SiO25~10%, FeO 20~23%, Al2O38~12%, SiC 7~8%, ZnO 1~2%, MgO 3~5%, by matter
Measure score meter.
Technical effect
Compared with prior art, steel mill's sludge of the invention has the characteristics that high calcium and low silicone aluminium, in addition, also rich in
Irony element, CaCO3, SiC can be used as preferable foaming ingredient, guarantee the characteristic of lightweight；SiO2And Al2O3As at Tao Chengfen,
Aggregate skeleton and intensity are provided；Metal oxide reduces glass transition temperature as fluxing ingredient；
The analysis of phase constituent is carried out to the aggregate of different ratios of raw materials, discovery sludge accounting weighs 10%~40% and fine coal
In the range of grey accounting weighs 60%~90%, aggregate has preferable intensity, and aggregate is more crisp outside this range, can according to XRD spectrum
To find what the intensity of aggregate was mainly determined by mullite phase from phase constituent；
For raw material ball of the invention in air atmosphere after sinter molding, there is more closed hole in inside, hereby it is ensured that
Aggregate lightweight and heat preservation property；
Lightweight aggregate of the invention has the characteristics that small high intensity, density, good heat preservation performance, water absorption rate are low, with steel mill and thermoelectricity
The solid waste of factory is raw material, has not only solved the whereabouts of waste, but also reduce the cost for preparing construction material.
It is described further below with reference to technical effect of the attached drawing to design of the invention, specific structure and generation, with
It is fully understood from the purpose of the present invention, feature and effect.
Detailed description of the invention
Fig. 1 is the process flow chart that lightweight aggregate is prepared using high calcium sludge of a preferred embodiment of the invention；
Fig. 2 is the aggregate XRD spectrum of the different ratios of raw materials of a preferred embodiment of the invention；
Fig. 3 is scanning electron microscope (SEM) photo of the lightweight aggregate section of a preferred embodiment of the invention.
Specific embodiment
Multiple preferred embodiments of the invention are introduced below with reference to Figure of description, keep its technology contents more clear and just
In understanding.The present invention can be emerged from by many various forms of embodiments, and protection scope of the present invention not only limits
The embodiment that Yu Wenzhong is mentioned.
Experiment flow of the invention is dry by industrial sludge as shown in Figure 1:, after the completion by dry sludge and fine coal ash content
The sieve that Yan Mo, not cross 200 mesh, sewage sludge powder and flyash powder are uniformly mixed, adds water to be granulated to obtain raw material ball, then passes through
Drying, preheating, sintering, cooling obtain final finished.
As shown in Figures 2 and 3, analysis (the F:W=flyash: industry of phase constituent has been carried out to the aggregate of different ratios of raw materials
Sludge).The pure aggregate prepared with industrial sludge mainly contains SiO2、Fe2O3、Ca(Al2SiO8) three kinds of object phases.It is pure to use coal ash for manufacturing
Standby aggregate mainly contains SiO2、Fe2O3、Ca(Al2SiO8)、Al6Si2O13.When the accounting of sludge is greater than 40%, in aggregate
The peak intensity of mullite phase in XRD is weaker, illustrates that mullite is mutually less to a certain extent, and the peak of anorthite phase is more sharp, says
Bright crystallinity is good.By to sludge accounting weigh 0%~40% and flyash accounting weigh 60%~100% in the range of aggregate
Performance is tested, it is found that the aggregate within the scope of this has certain intensity.And sludge accounting weigh 40%~100% and flyash account for
Aggregate intensity is lower in the range of specific gravity 0%~60%.Wherein sludge accounting weighs 20%, and flyash accounting weight is 80% for most
It is good.In summary, it can be deduced that mainly determined from the intensity of phase constituent angle analysis discovery aggregate by mullite phase.
Embodiment 1
A method of lightweight aggregate being prepared using pure high calcium sludge, is included the following steps:
A. the dewatered sludge that moisture content is 47% is put into drying box, dry at 105 DEG C smashing and grinding is made afterwards for 24 hours
Powder, gained sludge powder cross 200 meshes；
B. the sludge powder of 3kg is taken to pour into pelletizer, then alternately, pelletizer rotates in 55min for water spray charging
The raw material ball of 10-15mm, output 1.1L are obtained after 1760 circles；
C. the raw material ball is placed in drying box, the dry 1h at 105 DEG C；
D. the raw material ball after drying is placed in Muffle furnace, 300 DEG C is warming up to the heating rate of 10 DEG C/min, 300
20min is kept the temperature at DEG C, is risen to 1100 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 25min；
E. the aggregate being burnt into cools to room temperature with the furnace.
It is tested by the performance to obtained lightweight aggregate, obtains following main performance as a result, lightweight aggregate cylinder is made
Compressive Strength is 1.9MPa, and intensity is lower, bulk density 547kg/m3, water absorption rate 37% do not meet lightweight aggregate national standard
" GB/T 17431.1-2010 Test methods for lightweight aggregates ".
Embodiment 2
A method of the coal ash for manufacturing that high calcium sludge and accounting using accounting 80% are 20% is for lightweight aggregate, including such as
Lower step:
1, the dewatered sludge that moisture content is 47% is put into drying box, dry at 105 DEG C smashing and grinding is made afterwards for 24 hours
Powder, gained sludge powder and flyash cross 200 meshes respectively；
It 2, is 80% according to sludge weight ratio and proportion that flyash weight ratio is 20% is mixed；
3, the mixing of 3kg is taken to pour into pelletizer after mixing, then alternately, pelletizer is in 70min for water spray charging
The raw material ball of 10-15mm, output 1.8L are obtained after interior 2240 circle of rotation；
4, the raw material ball is placed in drying box, the dry 1h at 105 DEG C；
5, the raw material ball after drying is placed in Muffle furnace, 300 DEG C is warming up to the heating rate of 10 DEG C/min, 300
20min is kept the temperature at DEG C, is risen to 1100 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 25min；
6, the aggregate being burnt into cools to room temperature with the furnace.
It is tested by the performance to obtained lightweight aggregate, obtains following main performance as a result, lightweight aggregate cylinder is made
Compressive Strength is 2.1MPa, and intensity is lower, bulk density 558kg/m3, water absorption rate 28% do not meet lightweight aggregate national standard
" GB/T 17431.1-2010 Test methods for lightweight aggregates ".
Embodiment 3
A method of the coal ash for manufacturing that high calcium sludge and accounting using accounting 60% are 40% is for lightweight aggregate, including such as
Lower step:
1, the dewatered sludge that moisture content is 47% is put into drying box, dry at 105 DEG C smashing and grinding is made afterwards for 24 hours
Powder, gained sludge powder and flyash cross 200 meshes respectively；
It 2, is 20% according to sludge weight ratio and proportion that flyash weight ratio is 80% is mixed；
3, the mixing of 3kg is taken to pour into pelletizer after mixing, then alternately, pelletizer is in 77min for water spray charging
The raw material ball of 10-15mm, output 2.2L are obtained after interior 2464 circle of rotation；
4, the raw material ball is placed in drying box, the dry 1h at 105 DEG C；
5, the raw material ball after drying is placed in Muffle furnace, 300 DEG C is warming up to the heating rate of 10 DEG C/min, 300
20min is kept the temperature at DEG C, is risen to 1100 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 25min；
6, the aggregate being burnt into cools to room temperature with the furnace.
It is tested by the performance to obtained lightweight aggregate, obtains following main performance as a result, lightweight aggregate cylinder is made
Compressive Strength is 5.7MPa, and intensity is got higher, bulk density 605kg/m3, water absorption rate 26%, do not meet still lightweight aggregate country mark
Quasi- " GB/T 17431.1-2010 Test methods for lightweight aggregates ".
Embodiment 4
A method of the coal ash for manufacturing that high calcium sludge and accounting using accounting 20% are 80% is for lightweight aggregate, including such as
Lower step:
1, the dewatered sludge that moisture content is 47% is put into drying box, dry at 105 DEG C smashing and grinding is made afterwards for 24 hours
Powder, gained sludge powder and flyash cross 200 meshes respectively；
It 2, is 20% according to sludge weight ratio and proportion that flyash weight ratio is 80% is mixed；
3, the mixing of 3kg is taken to pour into pelletizer after mixing, then alternately, pelletizer is in 73min for water spray charging
The raw material ball of 10-15mm, output 2.5L are obtained after interior 2336 circle of rotation；
4, the raw material ball is placed in drying box, the dry 1h at 105 DEG C；
5, the raw material ball after drying is placed in Muffle furnace, 300 DEG C is warming up to the heating rate of 10 DEG C/min, 300
20min is kept the temperature at DEG C, is risen to 1100 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 25min；
6, the aggregate being burnt into cools to room temperature with the furnace.
It is tested by the performance to obtained lightweight aggregate, obtains following main performance as a result, lightweight aggregate cylinder is made
Compressive Strength is 8.3MPa, and intensity is higher, bulk density 793kg/m3, water absorption rate 20% meets lightweight aggregate national standard
" GB/T 17431.1-2010 Test methods for lightweight aggregates ".
Embodiment 5
A method of the coal ash for manufacturing that high calcium sludge and accounting using accounting 20% are 80% is for lightweight aggregate, including such as
Lower step:
1, the dewatered sludge that moisture content is 47% is put into drying box, dry at 105 DEG C smashing and grinding is made afterwards for 24 hours
Powder, gained sludge powder and flyash cross 200 meshes respectively；
It 2, is 20% according to sludge weight ratio and proportion that flyash weight ratio is 80% is mixed；
3, the mixing of 3kg is taken to pour into pelletizer after mixing, then alternately, pelletizer is in 73min for water spray charging
The raw material ball of 10-15mm, output 2.5L are obtained after interior 2336 circle of rotation；
4, the raw material ball is placed in drying box, the dry 1h at 105 DEG C；
5, the raw material ball after drying is placed in Muffle furnace, 300 DEG C is warming up to the heating rate of 10 DEG C/min, 300
20min is kept the temperature at DEG C, is risen to 1050 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 25min；
6, the aggregate being burnt into cools to room temperature with the furnace.
It is tested by the performance to obtained lightweight aggregate, obtains following main performance as a result, lightweight aggregate is made
Cylindrical compress strength is 8.8MPa, and intensity is higher, bulk density 852kg/m3, water absorption rate 15% meets lightweight aggregate national standard
" GB/T 17431.1-2010 Test methods for lightweight aggregates ".
Embodiment 6
A method of the coal ash for manufacturing that high calcium sludge and accounting using accounting 20% are 80% is for lightweight aggregate, including such as
Lower step:
1, the dewatered sludge that moisture content is 47% is put into drying box, dry at 105 DEG C smashing and grinding is made afterwards for 24 hours
Powder, gained sludge powder and flyash cross 200 meshes respectively；
It 2, is 20% according to sludge weight ratio and proportion that flyash weight ratio is 80% is mixed；
3, the mixing of 3kg is taken to pour into pelletizer after mixing, then alternately, pelletizer is in 73min for water spray charging
The raw material ball of 10-15mm, output 2.5L are obtained after interior 2336 circle of rotation；
4, the raw material ball is placed in drying box, the dry 1h at 105 DEG C；
5, the raw material ball after drying is placed in Muffle furnace, 300 DEG C is warming up to the heating rate of 10 DEG C/min, 300
20min is kept the temperature at DEG C, is risen to 1200 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 25min；
6, the aggregate being burnt into cools to room temperature with the furnace.
It is tested by the performance to obtained lightweight aggregate, obtains following main performance as a result, lightweight aggregate is made
Cylindrical compress strength is 9.6MPa, and intensity is very high, bulk density 987kg/m3, water absorption rate 4.3%, meet lightweight aggregate country mark
Quasi- " GB/T 17431.1-2010 Test methods for lightweight aggregates ".
On preferred embodiment of the invention is described in detail.It should be appreciated that the ordinary skill of this field is without creating
Property labour can it is according to the present invention design make many modifications and variations.Therefore, all technician in the art according to
Design of the invention passes through the available technical side of logical analysis, reasoning, or a limited experiment on the basis of existing technology
Case, all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of method for preparing lightweight aggregate, which is characterized in that the raw material of the lightweight aggregate includes industrial sludge and flyash, institute
The method of stating includes the following steps:
(1) industrial sludge that moisture content is 45%~55% is dried into 20~30h at 100~110 DEG C, it after the completion will be dry
Industrial sludge and flyash grind respectively, cross 200 mesh sieve below；
(2) obtained sewage sludge powder, flyash powder will be handled by step (1) by weight mixing, the sewage sludge powder accounts for
Specific gravity 10%~40%, the flyash powder accounting weigh 60%~90%, and stirring forms mixing；
(3) 2~4kg of mixing of step (2) is taken to pour into pelletizer, then alternately, pelletizer is in 70~75min for water spray charging
The raw material ball of 10-15mm is obtained after interior 2330~2240 circle of rotation；
(4) raw material ball of step (3) is put into drying box, dry 60~90min at 100~110 DEG C；
(5) raw material ball that step (4) processing obtains is preheated into 20~30min at 300~500 DEG C；
(6) raw material ball of step (5) the pre-heat treatment is roasted into 20~30min at 1050~1200 DEG C, raw material ball gradually glass
Change, obtains the aggregate after cooling.
2. the average particle size of sewage sludge powder that the method for claim 1, wherein step (1) processing obtains is 8~
10um, flyash powder average particle size be 13~15um.
3. the raw material ball for the method for claim 1, wherein obtaining step (4) processing in step (5) is with 10 DEG C/min
Heating rate be heated to 300 DEG C, keep the temperature 20min at 300 DEG C.
4. the method for claim 1, wherein in step (6) by the raw material ball of step (5) the pre-heat treatment with 5 DEG C/min
Heating rate rise to 1050 DEG C, roast 25min at 1050 DEG C.
5. the method for claim 1, wherein the industrial sludge is in steel mill or power plant, the industrial sludge
Ingredient include CaCO335~40%, SiO25~10%, FeO 20~23%, Al2O38~12%, SiC 7~8%,
ZnO 1~2%, MgO 3~5%, as mass fraction.
6. a kind of lightweight aggregate, which is characterized in that the raw material of the lightweight aggregate includes industrial sludge and flyash, according to weight ratio,
The industrial sludge accounting weighs 10%~40%, and the flyash accounting weighs 60%~90%, the moisture content of the industrial sludge
It is 45~55%.
7. lightweight aggregate as claimed in claim 6, wherein the industrial sludge derives from steel mill or power plant, the industrial sludge
In ingredient include CaCO335~40%, SiO25~10%, FeO 20~23%, Al2O38~12%, SiC 7~8%,
ZnO 1~2%, MgO 3~5%, as mass fraction.
8. lightweight aggregate as claimed in claim 7, wherein according to weight ratio, the industrial sludge accounting weighs 20%, the fine coal
Grey accounting weighs 80%.
9. lightweight aggregate as claimed in claim 6, wherein the lightweight aggregate is raw material ball, and the inside of the raw material ball has multiple
Closed hole, the diameter of the raw material ball are 10-15mm.
10. lightweight aggregate as claimed in claim 6, wherein the cylindrical compress strength of the lightweight aggregate is 8.0~9.6Mpa, is accumulated close
Degree is 793~987kg/m3, water absorption rate is 4.3%~20%.
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