CN107555824A - A kind of lightweight aggregate and preparation method thereof - Google Patents
A kind of lightweight aggregate and preparation method thereof Download PDFInfo
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- CN107555824A CN107555824A CN201710881262.7A CN201710881262A CN107555824A CN 107555824 A CN107555824 A CN 107555824A CN 201710881262 A CN201710881262 A CN 201710881262A CN 107555824 A CN107555824 A CN 107555824A
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- gangue
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Abstract
The invention belongs to building material technical field, specially a kind of lightweight aggregate, component includes dewatered sludge, gangue and flyash, and accounting weight is 8% 19% respectively, and 10% 48%, 46% 78%.Present invention also offers a kind of preparation method of lightweight aggregate, and sludge, gangue, flyash are dried, and is then obtained respectively by grinding, crossing 100 mesh sieves<150 μm of particle diameter；Dewatered sludge, gangue, the flyash of processing, than being stirred after mixing, are put into tablet press machine, molding mass is cylinder, and film-making pressure is 6MPa according to weight；Raw material are calcined, are cooled to room temperature forming.The lightweight aggregate of gained of the invention has the characteristics that high intensity, good heat insulating, water absorption rate are low.Thermal-insulating type lightweight aggregates are made using three kinds of sludge, flyash, gangue industrial wastes, and its raw material is industry, municipal waste, twice laid, and energy-conserving and environment-protective reduce building material cost.
Description
Technical field
The invention belongs to building material technical field, and in particular to a kind of lightweight aggregate and preparation method thereof.
Background technology
It is leading type raw material of building materials to build aggregate, is divided into lightweight aggregate and heavy aggregate, density rating≤1200kg/m3
Aggregate be referred to as lightweight aggregate, density >=1200kg/m3Aggregate be referred to as heavy aggregate.The characteristics of building aggregate is density difference material
Expect that performance is different, lightweight aggregate light weight, thermal and insulating performance are good, are configuration≤800kg/m3It is incubated lightweight aggregate concrete, 800-
1400kg/m3Structural thermal insulation concrete, 1400-1900kg/m3Raw material necessary to structural lightweight aggregate concrete.Due to lightweight aggregate
Concrete and its product thermal and insulating performance are good, simultaneously for mitigation structural weight per square meter, reduce raw material price, reduction construction costs
Economizing on resources etc. has outstanding role.Therefore the main direction of development of lightweight aggregate concrete and wall and materials for wall industry it
One.
The lightweight aggregate of current domestic extensive utilization is mainly leca, and leca is typical industrial goods lightweight aggregate,
There is lightweight, high intensity, good heat preservation performance.Therefore the preferred raw materials as configuration lightweight aggregate concrete.But due to viscous
There are power consumption, pollution, sunshine field three major issues in native haydite production, cause China's leca industry not flourishing enough, the whole nation is only produced per year
5,000,000 cubes of haydite is huge with 3,000,000,000 cubes of plastics products for building gaps of China's year demand.Due to China's lightweight aggregate supply and demand lance
Shield protrude, cause for many years the lightweight aggregate market price remain high.National most cities leca differs with sandstone aggregate
Two 3 times.
Due to the defects of different all be present in the processing method of disposal of current sludge and can not extensive use, so seeking new
Cost-effective treatment technology there is very important realistic meaning.From the point of view of recycling sludge research on utilization in recent years, weight
The problem of metal is one of key problem of recycling sludge, as well as the presence of Heavy Metals in Sludge so that utilizes dirt
Mud high temperature sintering, which prepares building material product, to be turned into than better suited method of resource.Sintering process processing sludge can be effectively to dirt
Heavy metal in mud solidify well and consolidate, while can avoid secondary pollution of the recycling sludge process to environment.This
The major product of class application has clinker, brick and tile, ceramics, haydite etc..Wherein ceramic process is produced using sludge
The production of product is higher to the performance and component requirements of raw material；It is more feasible to prepare brick and tile, but it is big that addition is generally required in technique
Clay is measured, and common brick and tile economic value added is relatively low；It is higher to prepare requirement of the clinker to Ca O in raw material, and sludge
In Ca O contents with clinker to it requirement difference it is larger, while in sludge salt, oils and clay mineral presence
The performance of cement concrete can be weakened.
The content of the invention
To solve problems of the prior art, the present invention will provide a kind of method that haydite is prepared using sludge
And a kind of lightweight aggregate is provided simultaneously, concrete scheme is as follows：
A kind of lightweight aggregate, its component includes dewatered sludge, gangue and flyash, according to weight ratio, wherein sludge accounting
Weight is 8%-19%, and flyash accounting weight is 46%-78%, and gangue accounting weight is 10%-48%.
Further, wherein sludge accounting weight is 10%, and flyash accounting weight is 69%, and gangue accounting weight is 21%.
A kind of preparation method of lightweight aggregate is provided according to another aspect of the present invention, is comprised the following steps,
Step 1)：Sludge, gangue, flyash are put into drying box, 95-110 DEG C of drying 36-60 of keeping temperature is small
When, pass through grinding after complete respectively, cross 100 mesh sieves, obtain<150 μm of particle diameter；
Step 2)：Dewatered sludge, gangue, flyash by step 1) processing is mixed in proportion, is stirred into
Raw material, wherein sludge accounting weight are 8%-19%, and flyash accounting weight is 46%-78%, and gangue accounting weight is 10%-
48%；
Step 3)：The raw material mixed are put into tablet press machine, molding mass is cylinder, and film-making pressure is 6MPa；
Raw material are calcined by step 4), with the rise of temperature, the gradual vitrifying of raw material,
Step 5) is cooled to room temperature, aggregate shaping.
Further, wherein the sintering temperature be 900-1300 DEG C, such a lightweight aggregate between 900 DEG C to 1300 DEG C,
Burned in air atmosphere, after sinter molding, inside is in cellular, more closed hole be present, therefore have heat-insulated, light
The characteristic of matter.
Further, described baking modes use pressure sintering.
The lightweight aggregate of gained of the invention has the characteristics that high intensity, good heat insulating, water absorption rate are low.Utilize sludge, fine coal
Three kinds of ash, gangue industrial wastes make thermal-insulating type lightweight aggregate, and its raw material is industry, municipal waste, twice laid, is saved
Environmental protection, substantially reduce building material cost.Raw material municipal sludge, it is each city urgent problem to be solved, gathers materials on the spot, at one stroke
Two；Flyash is also that each power plant needs waste to be processed；Gangue never has good utilization in lightweight aggregate field.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to this hair
It is bright to be further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not
For limiting the present invention.
Embodiment 1：
Municipal sludge pre-processes：Municipal sludge is placed in drying box, drying drying is carried out at 105 DEG C, it is small to dry 48
When, then grind, it is standby to cross 100 mesh sieves.Flyash pre-processes：Flyash is placed in drying box, is dried at 105 DEG C,
Dry 48 hours, then grind, it is standby to cross 100 mesh sieves.Gangue pre-processes：Gangue is placed in drying box, at 105 DEG C
It is dried, dries 48 hours, then grind, it is standby crosses 100 mesh sieves.By municipal sludge processed above, flyash, coal
Spoil mixes according to a certain percentage, and wherein sludge accounting weight is 10%, and flyash accounting weight is 69%, and gangue accounting weight is
21%.And powder is obtained after being mixed with electric mixer.Powder after mixing is put into mould for tabletting press and is press-formed, Gu
Constant-pressure is 6MP.The high-temperature region raw material of extrusion forming being put into high temperature tubular resistor furnace is sintered experiment.In air
Burned under atmosphere, heating rate is 50 DEG C/min, and sintering temperature is set as 1150 DEG C, held time as 30min.Close
High temperature tubular resistor furnace, naturally cool to room temperature.Take out sintered body and obtain made lightweight aggregate.Through experiment test, lightweight aggregate is made
Compression strength is 6.5MPa or so.Meet lightweight aggregate national standard《GB/T 2842-1981 Test methods for lightweight aggregates》.Density etc.
Level is 656kg/m3.Specific surface area is 26.8m2/g.Big compared with haydite specific surface area on the market, compression strength is big, high insulating effect.
Embodiment 2：
Municipal sludge pre-processes：Municipal sludge is placed in drying box, is dried at 105 DEG C, it is dry 48 hours, so
After grind, cross 100 mesh sieves it is standby.Flyash pre-processes：Flyash is placed in drying box, is dried at 105 DEG C, is dried
48 hours, then grind, it is standby to cross 100 mesh sieves.Gangue pre-processes：Gangue is placed in drying box, in 105 DEG C of progress
Dry, dry 48 hours, then grind, it is standby to cross 100 mesh sieves.By municipal sludge processed above, flyash, gangue
Mix according to a certain percentage, wherein sludge accounting weight is 8%, and flyash accounting weight is 46%, and gangue accounting weight is 46%,
And powder is obtained after being mixed with electric mixer.Powder after mixing is put into mould for tabletting press and is press-formed, fixation pressure
For 6MP.The high-temperature region raw material of extrusion forming being put into high temperature tubular resistor furnace is sintered experiment.In air atmosphere
Burned, heating rate is 50 DEG C/min, and sintering temperature is set as 1150 DEG C, held time as 30min.Close high temperature pipe
Formula resistance furnace, naturally cools to room temperature.Take out sintered body and obtain made lightweight aggregate.Through experiment test, lightweight aggregate pressure resistance is made
Spend for 3.7MPa or so.Density rating is 722kg/m3.Specific surface area is 15.7m2/ g or so, meet lightweight aggregate national standard
《GB/T 2842-1981 Test methods for lightweight aggregates》.
Embodiment 3：
Municipal sludge pre-processes：Municipal sludge is placed in drying box, is dried at 105 DEG C, it is dry 48 hours, so
After grind, cross 100 mesh sieves it is standby.Flyash pre-processes：Flyash is placed in drying box, is dried at 105 DEG C, is dried
48 hours, then grind, it is standby to cross 100 mesh sieves.Gangue pre-processes：Gangue is placed in drying box, in 105 DEG C of progress
Dry, dry 48 hours, then grind, it is standby to cross 100 mesh sieves.By municipal sludge processed above, flyash, gangue
Mix according to a certain percentage, wherein sludge accounting weight is 19%, and flyash accounting weight is 71%, and gangue accounting weight is 10%.
And powder is obtained after being mixed with electric mixer.Powder after mixing is put into mould for tabletting press and is press-formed, fixation pressure
For 6MP.The high-temperature region raw material of extrusion forming being put into high temperature tubular resistor furnace is sintered experiment.In air atmosphere
Burned, heating rate is 50 DEG C/min, and sintering temperature is set as 1150 DEG C, held time as 30min.Close high temperature pipe
Formula resistance furnace, naturally cools to room temperature.Take out sintered body and obtain made lightweight aggregate.It is 7.0MPa that lightweight aggregate compression strength, which is made,
Left and right.Density rating is 876kg/m3.Specific surface area is 11.8m2/ g or so, meet lightweight aggregate national standard《GB/T 2842-
1981 Test methods for lightweight aggregates》.
In three above embodiment, wherein for sintering process, sintering temperature is between 900-1300 DEG C, with temperature
The rise of degree, the gradual vitrifying of raw material, and under this temperature range, chemical reaction generation gas occurs for three kinds of materials, gas exists
Produced inside spherolite, so that the ball material expansion under glassy state, the gas of generation is fixed therein by spherolite, and then shape
Into internal closed loose structure, reach the purpose of insulation.It is well known that gas is the maximum material of thermal resistance, gas is fixed on
In clinker, contribute to the increase of material thermal resistance.Generally speaking, sintering process can be divided into two major classes：The burning of external pressure is not applied
Knot and the sintering for applying external pressure, are referred to as not pressurized sintering and pressure sintering.Experiments verify that clinker obtained by pressure sintering is strong
Degree is significantly greater than and is not pressurized sintering, therefore the application sintering processing uses pressure sintering.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (5)
- A kind of 1. lightweight aggregate, it is characterised in that：Its component includes dewatered sludge, gangue and flyash, according to weight ratio, wherein Sludge accounting weight is 8%-19%, and flyash accounting weight is 46%-78%, and gangue accounting weight is 10%-48%.
- A kind of 2. lightweight aggregate as claimed in claim 1, it is characterised in that：Sludge accounting weight is 10%, and flyash accounting weight is 69%, gangue accounting weight is 21%.
- A kind of 3. preparation method of lightweight aggregate, it is characterised in that：Comprise the following steps,Step 1)：Sludge, gangue, flyash are put into 95-110 DEG C of drying 36-60 hour of keeping temperature in drying box, then Respectively by grinding, crossing 100 mesh sieves, obtain<150 μm of particle diameter；Step 2)：Dewatered sludge, gangue, flyash by step 1) processing is mixed in proportion, is stirred into raw material, Wherein sludge accounting weight is 8%-19%, and flyash accounting weight is 46%-78%, and gangue accounting weight is 10%-48%；Step 3)：The raw material mixed are put into tablet press machine, molding mass is cylinder, and film-making pressure is 6MPa；Step 4)：Raw material after step 3) processing are calcined, with the rise of temperature, the gradual vitrifying of raw material；Step 5)：It is cooled to room temperature, aggregate shaping.
- A kind of 4. preparation method of lightweight aggregate as claimed in claim 3, it is characterised in that：Wherein described sintering temperature is 900- 1300℃。
- A kind of 5. preparation method of lightweight aggregate as claimed in claim 3, it is characterised in that：Described baking modes are using pressurization Sintering.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109053145A (en) * | 2018-10-17 | 2018-12-21 | 沈阳航空航天大学 | A kind of sludge mixing lightweight aggregate and its preparation process |
| CN110104975A (en) * | 2019-05-15 | 2019-08-09 | 中南大学 | A kind of technique that belt type roasting machine pelletizing method prepares gangue lightweight aggregate |
| CN110550936A (en) * | 2019-09-20 | 2019-12-10 | 沈阳航空航天大学 | Method for improving thickness of outer enamel layer of ceramsite by using sludge slurry |
| CN113060983A (en) * | 2021-05-20 | 2021-07-02 | 太原钢铁(集团)有限公司 | Preparation method of large-volume fly ash unfired lightweight aggregate |
| CN115959922A (en) * | 2022-12-16 | 2023-04-14 | 内蒙古工业大学 | Coal-based solid waste thermal insulation aggregate and preparation method and application thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102219418A (en) * | 2011-03-28 | 2011-10-19 | 重庆大学 | Resource utilization method for preparing synthetic lightweight aggregate by sludge |
-
2017
- 2017-09-26 CN CN201710881262.7A patent/CN107555824A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102219418A (en) * | 2011-03-28 | 2011-10-19 | 重庆大学 | Resource utilization method for preparing synthetic lightweight aggregate by sludge |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109053145A (en) * | 2018-10-17 | 2018-12-21 | 沈阳航空航天大学 | A kind of sludge mixing lightweight aggregate and its preparation process |
| CN110104975A (en) * | 2019-05-15 | 2019-08-09 | 中南大学 | A kind of technique that belt type roasting machine pelletizing method prepares gangue lightweight aggregate |
| CN110104975B (en) * | 2019-05-15 | 2021-06-08 | 中南大学 | Process for preparing coal gangue lightweight aggregate by belt type roasting machine pelletizing method |
| CN110550936A (en) * | 2019-09-20 | 2019-12-10 | 沈阳航空航天大学 | Method for improving thickness of outer enamel layer of ceramsite by using sludge slurry |
| CN113060983A (en) * | 2021-05-20 | 2021-07-02 | 太原钢铁(集团)有限公司 | Preparation method of large-volume fly ash unfired lightweight aggregate |
| CN115959922A (en) * | 2022-12-16 | 2023-04-14 | 内蒙古工业大学 | Coal-based solid waste thermal insulation aggregate and preparation method and application thereof |
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Application publication date: 20180109 |