CN112159189A - Method for preparing autoclaved aerated concrete product by using waste silicon sludge - Google Patents
Method for preparing autoclaved aerated concrete product by using waste silicon sludge Download PDFInfo
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- CN112159189A CN112159189A CN202010959526.8A CN202010959526A CN112159189A CN 112159189 A CN112159189 A CN 112159189A CN 202010959526 A CN202010959526 A CN 202010959526A CN 112159189 A CN112159189 A CN 112159189A
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- Prior art keywords
- waste silicon
- aerated concrete
- autoclaved aerated
- silicon sludge
- sludge
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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
- C04B28/141—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 dihydrated gypsum before the final hardening step, e.g. forming a dihydrated gypsum product followed by a de- and rehydration step
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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
- C04B18/04—Waste materials; Refuse
- C04B18/0418—Wet materials, e.g. slurries
-
- 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
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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)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of autoclaved aerated concrete, and particularly relates to a method for preparing an autoclaved aerated concrete product by using waste silicon sludge, which comprises the following steps: s1: drying the waste silicon sludge; s2: selecting 40-60 parts of waste silicon mud, 20-40 parts of cement and 15-35 parts of lime by mass fraction, grinding the waste silicon mud, the cement and the lime into powder, and mixing; s3: selecting 1-5 parts of gypsum by mass, and stirring and mixing the mixed powder obtained in the step S2 and the gypsum; the invention replaces river sand and fly ash with waste silicon sludge to produce autoclaved aerated concrete, the autoclaved aerated concrete is a novel energy-saving building material with a light and porous structure, and the usage amount of the autoclaved aerated concrete is large, so that a large amount of waste silicon sludge can be treated, and the problems of land occupation and environment pollution of the waste silicon sludge are solved.
Description
Technical Field
The invention relates to the technical field of autoclaved aerated concrete, in particular to a method for preparing an autoclaved aerated concrete product by using waste silicon mud.
Background
At present, the diamond wire slice is widely applied to monocrystalline silicon enterprises, and in polycrystalline silicon slices, the diamond wire is expected to replace steel wires and mortar slices and is disputed by a plurality of enterprises. In the cutting of single crystal silicon or polycrystalline silicon, a diamond wire generates a large amount of cut silicon powder having an average size of 5 μm, and the cut silicon powder contains a large amount of cutting liquid. The cut silica fume is settled by flocculation and then collected by a filter press, finally obtaining a "mud cake", herein referred to as "silica mud". Because the silicon powder in the silicon sludge is small in size and contains moisture and non-silicon impurities, most enterprises have no recovery capability and no economic value of reutilization.
A large amount of waste silicon sludge generated in industrial production cannot be effectively treated, not only a large amount of land resources are occupied, but also waste of silicon dioxide is caused, and the environment is also greatly polluted, so that the waste silicon sludge needs to be recycled.
Disclosure of Invention
The invention aims to provide a method for preparing an autoclaved aerated concrete product by using waste silicon sludge, which aims to solve the problems that a large amount of waste silicon sludge produced in industrial production in the background art cannot be effectively treated, a large amount of land resources are occupied, waste of silicon dioxide is caused, the environment is greatly polluted, and the waste silicon sludge needs to be recycled.
In order to achieve the purpose, the invention provides the following technical scheme: a method for preparing an autoclaved aerated concrete product by using waste silicon sludge comprises the following steps:
s1: drying the waste silicon sludge;
s2: selecting 40-60 parts of waste silicon mud, 20-40 parts of cement and 15-35 parts of lime by mass fraction, grinding the waste silicon mud, the cement and the lime into powder, and mixing;
s3: selecting 1-5 parts of gypsum by mass, and stirring and mixing the mixed powder obtained in the step S2 and the gypsum;
s4: adding warm water into the mixed stirred material obtained in the step S3, stirring for 2-4min, then adding a gas former, and quickly stirring for 30-50S, wherein:
the mass ratio of the added warm water to the mixed stirring material obtained in the step S3 is 0.6-0.7:1, and the warm water temperature is 55-65 ℃;
s5: and (5) pouring the slurry obtained in the step (S4) into a mold for foaming maintenance, demolding after the foaming maintenance is finished, putting into an autoclave for autoclaving maintenance, and drying after the autoclaving maintenance is finished to obtain the autoclaved aerated concrete block.
Preferably, the waste silicon sludge in the step S1 is dried at the temperature of 110-150 ℃, and SiO in the waste silicon sludge2The content is not less than 85%.
Preferably, the waste silicon mud, the cement and the lime in the step S2 are added into a ball mill to be milled and mixed.
Preferably, the content of CaO in the lime is not less than 92%.
Preferably, the foaming curing time of the step S4 is 3.5h-4.5h, and the foaming curing temperature is 50 ℃.
Preferably, the autoclave curing time in the step S4 is 8 hours, the internal temperature of the autoclave is 180-190 ℃, and the pressure is 1-1.3 MPa.
Preferably, the waste silicon sludge is selected from waste silicon sludge generated in the production process of silicon wafers in the solar silicon wafer industry or waste silicon sludge generated in the production process of polycrystalline silicon.
Preferably, the CaSO in the gypsum4·2H2The content of O is not less than 95 percent.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the invention, the waste silicon sludge replaces river sand and fly ash and is used for producing autoclaved aerated concrete, the autoclaved aerated concrete is a novel energy-saving building material with a light and porous structure, and the usage amount of the autoclaved aerated concrete is large, so that a large amount of waste silicon sludge can be treated, and the problems of land occupation and environment pollution of the waste silicon sludge are solved;
2) the production process is simple, convenient to operate and convenient for large-scale production of autoclaved aerated concrete;
3) the waste silicon sludge replaces river sand and fly ash and is used for producing the autoclaved aerated concrete, so that the manufacturing cost of the autoclaved aerated concrete is reduced.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like, indicate orientations or positional relationships only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present invention provides a technical solution: a method for preparing an autoclaved aerated concrete product by using waste silicon sludge comprises the following steps:
s1: drying the waste silicon sludge;
s2: selecting 40-60 parts of waste silicon mud, 20-40 parts of cement and 15-35 parts of lime by mass fraction, grinding the waste silicon mud, the cement and the lime into powder, and mixing;
s3: selecting 1-5 parts of gypsum by mass, and stirring and mixing the mixed powder obtained in the step S2 and the gypsum;
s4: adding warm water into the mixed stirring material obtained in the step S3, stirring for 2-4min, then adding a gas former, and quickly stirring for 30-50S, wherein the gas former is an aluminum powder gas former, and the method comprises the following steps:
the mass ratio of the added warm water to the mixed stirring material obtained in the step S3 is 0.6-0.7:1, and the warm water temperature is 55-65 ℃;
s5: and (5) pouring the slurry obtained in the step (S4) into a mold for foaming maintenance, demolding after the foaming maintenance is finished, putting into an autoclave for autoclaving maintenance, and drying after the autoclaving maintenance is finished to obtain the autoclaved aerated concrete block.
The waste silicon sludge in the step S1 is dried at the temperature of 110-150 ℃, and Si0 in the waste silicon sludge2The content is not less than 85%.
And in the step S2, the waste silicon mud, the cement and the lime are added into a ball mill for grinding and mixing.
The content of CaO in the lime is not less than 92%.
The foaming and curing time of the step S4 is 3.5h-4.5h, and the foaming and curing temperature is 50 ℃.
The step S4 is carried out for 8h, the internal temperature of the autoclave is 180-190 ℃, and the pressure is 1-1.3 MPa.
The waste silicon mud is selected from waste silicon mud generated in the production process of silicon wafers in the solar silicon wafer industry or waste silicon mud generated in the production process of polycrystalline silicon.
CaSO in said gypsum4·2H2The content of O is not less than 95 percent.
The first embodiment is as follows:
s1: drying the waste silicon sludge;
s2: selecting 40kg of waste silicon mud, 20kg of cement and 15kg of lime by mass fraction, and adding the waste silicon mud, the cement and the lime into a ball mill for grinding and mixing;
s3: selecting 1kg of gypsum by mass fraction, and stirring and mixing the mixed powder obtained in the step S2 and the gypsum;
s4: adding warm water into the mixed stirring material obtained in the step S3, stirring for 2-4min, then adding an aluminum powder gas former, and quickly stirring for 30-50S, wherein:
the mass ratio of the added warm water to the mixed stirring material obtained in the step S3 is 0.6:1, and the warm water temperature is 55-65 ℃;
s5: and (4) quickly pouring the slurry obtained in the step (S4) into a mold for foaming maintenance, controlling the foaming maintenance time to be 4 hours and the temperature to be 50 ℃, demolding after the foaming maintenance is finished, putting into an autoclave for autoclaving maintenance, setting the temperature in the autoclave to be 180 ℃, the pressure to be 1MPa, controlling the autoclaving maintenance time to be 8 hours, and drying after the autoclaving maintenance is finished to obtain the autoclaved aerated concrete block.
Example two:
s1: drying the waste silicon sludge;
s2: selecting 50kg of waste silicon mud, 30kg of cement and 25kg of lime by mass fraction, and adding the waste silicon mud, the cement and the lime into a ball mill for grinding and mixing;
s3: selecting 3kg of gypsum according to mass fraction, and stirring and mixing the mixed powder obtained in the step S2 with the gypsum;
s4: adding warm water into the mixed stirring material obtained in the step S3, stirring for 2-4min, then adding an aluminum powder gas former, and quickly stirring for 30-50S, wherein:
the mass ratio of the added warm water to the mixed stirring material obtained in the step S3 is 0.65:1, and the warm water temperature is 55-65 ℃;
s5: and (4) quickly pouring the slurry obtained in the step (S4) into a mold for foaming maintenance, controlling the foaming maintenance time to be 4 hours and the temperature to be 50 ℃, demolding after the foaming maintenance is finished, putting into an autoclave for autoclaving maintenance, setting the temperature in the autoclave to be 180 ℃, the pressure to be 1MPa, controlling the autoclaving maintenance time to be 8 hours, and drying after the autoclaving maintenance is finished to obtain the autoclaved aerated concrete block.
Example three:
s1: drying the waste silicon sludge;
s2: selecting 60kg of waste silicon mud, 40kg of cement and 35kg of lime by mass fraction, and adding the waste silicon mud, the cement and the lime into a ball mill for grinding and mixing;
s3: selecting 5kg of gypsum according to mass fraction, and stirring and mixing the mixed powder obtained in the step S2 with the gypsum;
s4: adding warm water into the mixed stirring material obtained in the step S3, stirring for 2-4min, then adding an aluminum powder gas former, and quickly stirring for 30-50S, wherein:
the mass ratio of the added warm water to the mixed stirring material obtained in the step S3 is 0.7:1, and the warm water temperature is 55-65 ℃;
s5: and (4) quickly pouring the slurry obtained in the step (S4) into a mold for foaming maintenance, controlling the foaming maintenance time to be 4 hours and the temperature to be 50 ℃, demolding after the foaming maintenance is finished, putting into an autoclave for autoclaving maintenance, setting the temperature in the autoclave to be 180 ℃, the pressure to be 1MPa, controlling the autoclaving maintenance time to be 8 hours, and drying after the autoclaving maintenance is finished to obtain the autoclaved aerated concrete block.
While there have been shown and described the fundamental principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference thereto is therefore intended to be embraced therein.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A method for preparing an autoclaved aerated concrete product by using waste silicon sludge is characterized by comprising the following steps: the method comprises the following steps:
s1: drying the waste silicon sludge;
s2: selecting 40-60 parts of waste silicon mud, 20-40 parts of cement and 15-35 parts of lime by mass fraction, grinding the waste silicon mud, the cement and the lime into powder, and mixing;
s3: selecting 1-5 parts of gypsum by mass, and stirring and mixing the mixed powder obtained in the step S2 and the gypsum;
s4: adding warm water into the mixed stirred material obtained in the step S3, stirring for 2-4min, then adding a gas former, and quickly stirring for 30-50S, wherein:
the mass ratio of the added warm water to the mixed stirring material obtained in the step S3 is 0.6-0.7:1, and the warm water temperature is 55-65 ℃;
s5: and (5) pouring the slurry obtained in the step (S4) into a mold for foaming maintenance, demolding after the foaming maintenance is finished, putting into an autoclave for autoclaving maintenance, and drying after the autoclaving maintenance is finished to obtain the autoclaved aerated concrete block.
2. The method for preparing the autoclaved aerated concrete product by using the waste silicon sludge as claimed in claim 1, which is characterized in that: the waste silicon sludge in the step S1 is dried at the temperature of 110-150 ℃, and SiO in the waste silicon sludge2The content is not less than 85%.
3. The method for preparing the autoclaved aerated concrete product by using the waste silicon sludge as claimed in claim 1, which is characterized in that: and in the step S2, the waste silicon mud, the cement and the lime are added into a ball mill for grinding and mixing.
4. The method for preparing the autoclaved aerated concrete product by using the waste silicon sludge as claimed in claim 1, which is characterized in that: the content of CaO in the lime is not less than 92%.
5. The method for preparing the autoclaved aerated concrete product by using the waste silicon sludge as claimed in claim 1, which is characterized in that: the foaming and curing time of the step S4 is 3.5h-4.5h, and the foaming and curing temperature is 50 ℃.
6. The method for preparing the autoclaved aerated concrete product by using the waste silicon sludge as claimed in claim 1, which is characterized in that: the step S4 is carried out for 8h, the internal temperature of the autoclave is 180-190 ℃, and the pressure is 1-1.3 MPa.
7. The method for preparing the autoclaved aerated concrete product by using the waste silicon sludge as claimed in claim 1, which is characterized in that: the waste silicon mud is selected from waste silicon mud generated in the production process of silicon wafers in the solar silicon wafer industry or waste silicon mud generated in the production process of polycrystalline silicon.
8. The method for preparing the autoclaved aerated concrete product by using the waste silicon sludge as claimed in claim 1, which is characterized in that: CaSO in said gypsum4·2H2The content of O is not less than 95 percent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010959526.8A CN112159189A (en) | 2020-09-14 | 2020-09-14 | Method for preparing autoclaved aerated concrete product by using waste silicon sludge |
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| CN202010959526.8A CN112159189A (en) | 2020-09-14 | 2020-09-14 | Method for preparing autoclaved aerated concrete product by using waste silicon sludge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114057460A (en) * | 2021-11-26 | 2022-02-18 | 海南广益多新型环保墙体材料有限公司 | Method for preparing autoclaved aerated concrete product by using waste silicon sludge |
| CN114409366A (en) * | 2021-12-24 | 2022-04-29 | 苏州良浦天路新型建材有限公司 | Aerated concrete plate beneficial to recycling and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10110117A (en) * | 1996-10-07 | 1998-04-28 | Tochigi Pref Gov | Production of inorganic wall-coating material utilizing sludge of crushed stone, wall-coating material thereby and wall material coated with the same |
| CN106565270A (en) * | 2016-11-04 | 2017-04-19 | 武汉天沭除尘设备有限公司 | Preparation method for producing autoclaved aerated concrete by using silicon sludge and product prepared by using preparation method |
| CN111170706A (en) * | 2020-01-10 | 2020-05-19 | 刘小志 | Method for preparing autoclaved aerated concrete building blocks by using waste silicon sludge |
-
2020
- 2020-09-14 CN CN202010959526.8A patent/CN112159189A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10110117A (en) * | 1996-10-07 | 1998-04-28 | Tochigi Pref Gov | Production of inorganic wall-coating material utilizing sludge of crushed stone, wall-coating material thereby and wall material coated with the same |
| CN106565270A (en) * | 2016-11-04 | 2017-04-19 | 武汉天沭除尘设备有限公司 | Preparation method for producing autoclaved aerated concrete by using silicon sludge and product prepared by using preparation method |
| CN111170706A (en) * | 2020-01-10 | 2020-05-19 | 刘小志 | Method for preparing autoclaved aerated concrete building blocks by using waste silicon sludge |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114057460A (en) * | 2021-11-26 | 2022-02-18 | 海南广益多新型环保墙体材料有限公司 | Method for preparing autoclaved aerated concrete product by using waste silicon sludge |
| CN114409366A (en) * | 2021-12-24 | 2022-04-29 | 苏州良浦天路新型建材有限公司 | Aerated concrete plate beneficial to recycling and preparation method thereof |
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Application publication date: 20210101 |