CN108911665A - A method of sand aerated concrete block is prepared using cast waste sand - Google Patents
A method of sand aerated concrete block is prepared using cast waste sand Download PDFInfo
- Publication number
- CN108911665A CN108911665A CN201810769502.9A CN201810769502A CN108911665A CN 108911665 A CN108911665 A CN 108911665A CN 201810769502 A CN201810769502 A CN 201810769502A CN 108911665 A CN108911665 A CN 108911665A
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- CN
- China
- Prior art keywords
- sand
- cast waste
- waste sand
- aerated concrete
- concrete block
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Classifications
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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
- 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
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
Abstract
The invention belongs to resource regeneration technical fields, disclose a kind of method for preparing sand aerated concrete block using cast waste sand.Include the following steps：Cast waste sand is washed；Magnetic separation；Wet ball grinding；It is matched in proportion using antiquated sand, cement, quick lime, gypsum as primary raw material；In the raw material prepared plus water is poured, foaming；Under the conditions of 50~60 DEG C to foaming after the green body that is formed rest；Cutting on line；Steam press maintenance obtains the air-entrained concrete building block prepared using cast waste sand as primary raw material after cooling.The present invention efficiently utilizes discarded cast waste sand, cost of the enterprise in processing casting is not only saved, also to be cast into raw material, it is prepared for novel energy-saving construction material -- air-entrained concrete building block, realize resource regeneration, meet the feature of circular economy, there is biggish economic value and social effect.
Description
Technical field
The invention belongs to resource regeneration technical field, it is related to a kind of preparing sand aerated concrete block using cast waste sand
Method.
Background technique
Cast waste sand is different from general solid waste, it is discarded in the substances such as waterglass, water glass curing agent casting
Hot setting in the process, outdoor and contacting rain water, waterglass can soften, alkaline matter meeting slow release, long-term pollution underground water
And soil.If the harmful substance in cast waste sand enters water body, trivalent chromium therein can gradually be changed into toxic Cr VI,
If being directly used in construction without harmless treatment, it will cause expansion, and the construction materials such as corrosion reinforcing bar, eventually lead to beans
The appearance of rotten slag engineering.In addition, a large amount of tiny particles are exposed outside in antiquated sand, the breaking up that racks causes dust pollution；Antiquated sand
Long-term outdoor stockpiling occupies a large amount of soils, and landfill, which is thrown aside, also will cause soil sand.
Therefore, how to efficiently use cast waste sand and have become casting industry urgent problem to be solved.If can be useless by casting
Sand is transformed into the reconstituted product with added value by certain processing, can not only save the institute on processing cast waste sand in the past
The expense of cost simultaneously solves the various environmental problems of cast waste sand bring, can also bring certain income.
Meanwhile air entrained concrete is that (sand, flyash and containing silicon tailings etc. are generally known as with what sand produced with siliceous material
Sand aerated concrete, with flyash produce be ash aerated concrete) and calcareous material (lime, cement) be primary raw material, mix
Add foaming agent (aluminium powder), it is light porous made of the technical process such as ingredient, stirring, casting, precuring, cutting, steam pressure, maintenance
Silicate product.Because it contains a large amount of uniform and tiny stomatas, therefore named air entrained concrete after getting angry.Air entrained concrete surface
It is smooth, corner angle are neat, in the form of plate, building block etc., be widely used in industrial premises and civil buildings and do wall, floor and room
The load-bearing materials such as panel and non-bearing material go along with sb. to guard him packing material.
Summary of the invention
It is an object of the invention to solve the handling problems of cast waste sand, a kind of antiquated sand reconstituted product and its preparation side are developed
Method converts the antiquated sand reconstituted product with added value for the Industrial Solid Waste for needing payment process originally, realizes resource regeneration
Purpose.Foundry sand belongs to Industrial Solid Waste after the completion of casting, and current processing mode is mostly broken rear straight cast waste sand
It connects and is doped into building sand, used as construction material for building site, What is more is directly discarded in wilderness field cast waste sand, no
Only serious waste resource, and return environment cause it is potentially hazardous.Technology provided by us obtains cast waste sand
Sufficient utilization, the problem of not only solving Industrial Solid Waste, and accomplished recycling for resource, while creating certain
Benefit, have highly important economic value and social effect.
The present invention is the cast waste sand resource utilization to generate after a kind of casting provided by solution current techniques deficiency
Technology, reconstituted product is sand aerated concrete block.
A method of sand aerated concrete block being prepared using cast waste sand, is included the following steps：
(1) cast waste sand is first washed, removes antiquated sand neutral and alkali ion；
(2) magnetic separation is carried out to the cast waste sand after washing, removes iron a small amount of in antiquated sand；
(3) wet ball grinding is carried out to the cast waste sand after magnetic separation using ball mill, obtains the slurry that particle diameter distribution is 1~2mm
Material；
(4) the resulting slurry of step (3), cement, quick lime and gypsum are mixed in proportion, material must be baked；
(5) add water to be poured in the resulting baking material of step (4), obtain castable, foaming agent is added in castable,
Foaming；
(6) green body formed after step (5) foaming is rested；
(7) cutting on line is carried out to the green body after resting with cellular concrete cutting off machine；
(8) green body after cutting is sent into still kettle and carries out steam press maintenance, obtain with cast waste sand being main after cooling
The air-entrained concrete building block of raw material preparation.
In step (1), in the cast waste sand, the mass percentage of silica is 70~88%, impurity include Fe,
The oxide of Al, Na, K, Ca, Mg or Ti.
In step (1), the washing is to wash in washed-out sand tank to cast waste sand.
In step (2), the magnetic separation is to carry out magnetic separation to the cast waste sand after washing using industrial wet magnetic separator.
In step (4), the mass ratio of cast waste sand, cement, quick lime and gypsum in slurry is 70~75：5~8：
15~19：3~5.
In step (5), water and the mass ratio for baking material are 0.63~0.65：1；The foaming agent is aluminium powder, with castable
Stereometer, the additive amount of foaming agent is 500-800g/m3。
In step (6), the temperature that the green body is rested is 50~60 DEG C, and the time is 1.5~2.5h.
In step (7), the time of the steam press maintenance is 6~8h.
Beneficial effects of the present invention are：
(1) using the cast waste sand formed after casting as " sand " source, free " sand " of purity is high, reserves foot had both been obtained
Source, but can allow this has been that the cast waste sand of Industrial Solid Waste is turned waste into wealth, resource regeneration.
(2) using cast waste sand, cement and calcareous material in the presence of foaming agent aluminium powder, by ingredient, stirring,
Light porous silicate product-- sand aerated concrete block made of the technical process such as casting, precuring, cutting, steam pressure, maintenance.
(3) cast waste sand resource utilization method of the invention utilizes money for existing cast waste sand disposal difficulties problem
Source regenerates, cast waste sand is processed into simple physical means and can be used in sand aerated concrete block by the thinking of comprehensive utilization
Qualification " sand " source of block production, and the added value of the reconstituted product is high, and economic feasibility is big, in development and utilization casting industry
Trade waste open new direction.
Detailed description of the invention
Fig. 1：For a kind of flow chart of the method for cast waste sand sand aerated concrete block of the present invention.
Specific embodiment
Implementation of the invention is further described by example.Below according to the process of attached drawing 1, provide of the invention
Specific embodiment.
Embodiment 1
A kind of cast waste sand, main component are silica 86.84%, major impurity Fe2O31.56%, Al2O3
4.06%, CaO 0.35%, MgO 0.26%, Na2O 0.50%, K2O 1.22%, TiO20.27%.
With reference to Fig. 1, a kind of method preparing sand aerated concrete block using cast waste sand of the present embodiment, including it is as follows
Step：
(1) cast waste sand is first washed in washed-out sand tank, removes excessively high alkali ion in antiquated sand, as potassium, sodium from
Son；
(2) magnetic separation is carried out to the cast waste sand after washing using industrial wet magnetic separator, removes iron a small amount of in antiquated sand；
(3) wet ball grinding is carried out to the cast waste sand after magnetic separation using ball mill, obtains the slurry that particle diameter distribution is 1~2mm
Material；
(4) the resulting slurry of step (3), cement, quick lime and gypsum are mixed in proportion, material must be baked；In slurry
Cast waste sand, cement, quick lime and gypsum press 70:8:19:3 are matched；
(5) add water to be poured in the resulting baking material of step (4), obtain castable, wherein ratio of water to material is 0.65:1, and
By 500g/m3Ratio be added foaming agent aluminium powder, foaming；
(6) green body formed after under the conditions of 55 DEG C to foaming is rested 2 hours；
(7) cutting on line is carried out to the green body after resting with cellular concrete cutting off machine (somersault type)；
(8) green body after cutting is sent into still kettle and carries out steam press maintenance, the time is 8 hours, steam pressure 1.3MPa, temperature
193 DEG C or so of degree obtains the sand aerated concrete block prepared using cast waste sand as primary raw material after cooling.
Through detecting, the density of gained sand aerated concrete block is 0.8Kg/m3。
Embodiment 2
A kind of cast waste sand, main component are silica 85.62%, major impurity Fe2O31.18%, Al2O3
4.90%, CaO 0.54%, MgO 0.58%, Na2O 0.63%, K2O 0.97%, TiO20.32%.
With reference to Fig. 1, a kind of method of cast waste sand sand aerated concrete block of the present embodiment includes the following steps：
(1) cast waste sand is first washed in washed-out sand tank, removes excessively high alkali ion in antiquated sand, as potassium, sodium from
Son；
(2) magnetic separation is carried out to the cast waste sand after washing using industrial wet magnetic separator, removes iron a small amount of in antiquated sand；
(3) wet ball grinding is carried out to the cast waste sand after magnetic separation using ball mill, obtains the slurry that particle diameter distribution is 1~2mm
Material；
(4) the resulting slurry of step (3), cement, quick lime and gypsum are mixed in proportion, material must be baked；In slurry
Cast waste sand, cement, quick lime and gypsum be primary raw material press 75:5:15:5 are matched；
(5) add water to be poured in the resulting baking material of step (4), obtain castable, wherein ratio of water to material 0.63:1,
And press 700g/m3Ratio be added foaming agent aluminium powder, foaming；
(6) green body formed after under the conditions of 55 DEG C to foaming is rested 2.5 hours；
(7) cutting on line is carried out to the green body after resting with cellular concrete cutting off machine (somersault type)；
(8) green body after cutting is sent into still kettle and carries out steam press maintenance, the time is 8 hours, steam pressure 1.3MPa, temperature
198 DEG C or so of degree obtains the sand aerated concrete block prepared using cast waste sand as primary raw material after cooling.
Through detecting, the density of gained sand aerated concrete block is 0.7Kg/m3。
Embodiment 3
(1) cast waste sand is first washed in washed-out sand tank, removes excessively high alkali ion in antiquated sand, as potassium, sodium from
Son；
(2) magnetic separation is carried out to the cast waste sand after washing using industrial wet magnetic separator, removes iron a small amount of in antiquated sand；
(3) wet ball grinding is carried out to the cast waste sand after magnetic separation using ball mill, obtains the slurry that particle diameter distribution is 1~2mm
Material；
(4) the resulting slurry of step (3), cement, quick lime and gypsum are mixed in proportion, material must be baked；In slurry
Cast waste sand, cement, quick lime and gypsum press 72:6:18:4 are matched；
(5) add water to be poured in the resulting baking material of step (4), obtain castable, wherein ratio of water to material is 0.64:1, and
By 800g/m3Ratio be added foaming agent aluminium powder, foaming；
(6) green body formed after under the conditions of 60 DEG C to foaming is rested 1.5 hours；
(7) cutting on line is carried out to the green body after resting with cellular concrete cutting off machine (somersault type)；
(8) green body after cutting is sent into still kettle and carries out steam press maintenance, the time is 6 hours, steam pressure 1.3MPa, temperature
193 DEG C or so of degree obtains the sand aerated concrete block prepared using cast waste sand as primary raw material after cooling.
Through detecting, the density of gained sand aerated concrete block is 0.75Kg/m3。
Claims (7)
1. a kind of method for preparing sand aerated concrete block using cast waste sand, which is characterized in that include the following steps：
(1) cast waste sand is first washed, removes antiquated sand neutral and alkali ion；
(2) magnetic separation is carried out to the cast waste sand after washing, removes iron a small amount of in antiquated sand；
(3) wet ball grinding is carried out to the cast waste sand after magnetic separation using ball mill, obtains the slurry that particle diameter distribution is 1~2mm；
(4) the resulting slurry of step (3), cement, quick lime and gypsum are mixed in proportion, material must be baked；
(5) add water to be poured in the resulting baking material of step (4), obtain castable, foaming agent is added in castable, foam
Molding；
(6) green body formed after step (5) foaming is rested；
(7) cutting on line is carried out to the green body after resting with cellular concrete cutting off machine；
(8) green body after cutting is sent into still kettle and carries out steam press maintenance, obtained using cast waste sand as primary raw material after cooling
The air-entrained concrete building block of preparation.
2. a kind of method for preparing sand aerated concrete block using cast waste sand according to claim 1, feature exist
In, in step (1), in the cast waste sand, the mass percentage of silica is 70~88%, impurity include Fe, Al,
The oxide of Na, K, Ca, Mg or Ti.
3. a kind of method for preparing sand aerated concrete block using cast waste sand according to claim 1, feature exist
In in step (4), the mass ratio of cast waste sand, cement, quick lime and gypsum in slurry is 70~75：5~8：15~
19：3~5.
4. a kind of method for preparing sand aerated concrete block using cast waste sand according to claim 1, feature exist
In in step (5), water and the mass ratio for baking material are 0.63~0.65：1.
5. a kind of method for preparing sand aerated concrete block using cast waste sand according to claim 1, feature exist
In the foaming agent is aluminium powder, and in terms of the volume of castable, the additive amount of foaming agent is 500-800g/m3。
6. a kind of method for preparing sand aerated concrete block using cast waste sand according to claim 1, feature exist
In in step (6), the temperature that the green body is rested is 50~60 DEG C, and the time is 1.5~2.5h.
7. a kind of method for preparing sand aerated concrete block using cast waste sand according to claim 1, feature exist
In in step (7), the time of the steam press maintenance is 6~8h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810769502.9A CN108911665A (en) | 2018-07-13 | 2018-07-13 | A method of sand aerated concrete block is prepared using cast waste sand |
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| CN201810769502.9A CN108911665A (en) | 2018-07-13 | 2018-07-13 | A method of sand aerated concrete block is prepared using cast waste sand |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111662027A (en) * | 2020-06-19 | 2020-09-15 | 滨州建华建材有限公司 | Aggregate substitute and application thereof |
| CN112723849A (en) * | 2021-01-04 | 2021-04-30 | 安徽省润乾节能建材科技股份有限公司 | Sand aerated concrete block prepared by using casting waste sand and preparation method and device |
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| CN102627468A (en) * | 2012-04-12 | 2012-08-08 | 金立虎 | Waste foundry sand aerated concrete building block and production process thereof |
| CN103964774A (en) * | 2014-05-09 | 2014-08-06 | 嵊州四明山新型建材有限公司 | Autoclaved aerated concrete block and manufacturing method thereof |
| CN106699218A (en) * | 2017-02-13 | 2017-05-24 | 石河子大学 | Desert sand autoclaved aerated concrete block and processing method thereof |
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- 2018-07-13 CN CN201810769502.9A patent/CN108911665A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102627468A (en) * | 2012-04-12 | 2012-08-08 | 金立虎 | Waste foundry sand aerated concrete building block and production process thereof |
| CN103964774A (en) * | 2014-05-09 | 2014-08-06 | 嵊州四明山新型建材有限公司 | Autoclaved aerated concrete block and manufacturing method thereof |
| CN106699218A (en) * | 2017-02-13 | 2017-05-24 | 石河子大学 | Desert sand autoclaved aerated concrete block and processing method thereof |
| CN107382245A (en) * | 2017-07-28 | 2017-11-24 | 长沙理工大学 | A kind of fine coal sand-lime autoclave aerated concrete building block and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111662027A (en) * | 2020-06-19 | 2020-09-15 | 滨州建华建材有限公司 | Aggregate substitute and application thereof |
| CN112723849A (en) * | 2021-01-04 | 2021-04-30 | 安徽省润乾节能建材科技股份有限公司 | Sand aerated concrete block prepared by using casting waste sand and preparation method and device |
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Application publication date: 20181130 |