CN110357543B - Lightweight flame-retardant wall brick containing desulfurization wastewater sludge and preparation method thereof - Google Patents
Lightweight flame-retardant wall brick containing desulfurization wastewater sludge and preparation method thereof Download PDFInfo
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- CN110357543B CN110357543B CN201910819979.8A CN201910819979A CN110357543B CN 110357543 B CN110357543 B CN 110357543B CN 201910819979 A CN201910819979 A CN 201910819979A CN 110357543 B CN110357543 B CN 110357543B
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- wall brick
- wastewater sludge
- sludge
- desulfurization wastewater
- retardant wall
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a light flame-retardant wall brick containing desulfurization wastewater sludge and a preparation method thereof, wherein the light flame-retardant wall brick is prepared from the following raw materials in percentage by weight: 45-55% of desulfurized wastewater sludge, 33-43% of cement, 5-7% of animal protein foaming agent and the balance of water. The desulfurization wastewater sludge is sludge produced by desulfurization wastewater treatment engineering of power plants in northern China, wherein the weight ratio of magnesium hydroxide in solid is more than 60%, and the water content of the sludge is 45-55%. Compared with the prior art, the invention has the following advantages: 1. the method uses the desulfurization wastewater sludge for preparing the light flame-retardant wall brick, fully utilizes waste resources, and is green and environment-friendly; 2. in the formula, the flame retardant property of the wall brick is improved by using magnesium hydroxide contained in the desulfurization wastewater sludge; 3. in the formula of the invention, animal protein foaming agent is used to form closed spherical and non-communicated pores, so that the fire resistance of the wall brick is improved, the material density is greatly reduced, and the weight is reduced.
Description
Technical Field
The invention belongs to the technical field of environmental protection and resource utilization and building material composition, and particularly relates to a lightweight flame-retardant wall brick containing desulfurization wastewater sludge and a preparation method thereof.
Background
At present, the most widely used flue gas desulfurization process in coal-fired power plants is mainly a wet limestone-gypsum method. The flue gas desulfurization process will produce more desulfurization sewage, and desulfurization sewage treatment produces a large amount of desulfurization waste water mud again. The state requires flue gas desulfurization projects of various power plants, along with the increasing of the production amount of desulfurization wastewater sludge, the development of enterprises is severely restricted by a large amount of accumulated desulfurization wastewater sludge, and the environment and the ecology are harmed.
The desulfurization wastewater sludge has the characteristics of high salinity, high water content, high viscosity, large volume, difficult dehydration and the like, is very unstable, and most of the components are water, magnesium hydroxide, calcium sulfate, coal ash, aluminum-silicon oxide, a small amount of heavy metal hydroxide and the like. If the sludge is not properly treated, not only the environment is polluted, but also the health of people is seriously injured.
The existing common desulfurization wastewater sludge treatment technology is mainly landfill, and the problem of underground water pollution is easy to occur.
And a small amount of desulfurized wastewater sludge is used as a cement retarder, a heat-insulating building block and the like. The cement retarder can improve the strength of cement and the structure and the performance of a cement hardened body, but because the desulfurization waste water sludge contains a large amount of magnesium hydroxide, the cement is easy to expand. As a heat-insulating block, the water resistance and the strength of the block are obviously superior to those of common building materials, but the heat-insulating block needs to be calcined to release sulfur dioxide again, thereby causing pollution.
The desulfurization wastewater sludge recycling method has respective limitations, and how to develop a simpler and more effective recycling method has important significance for environmental protection and resource utilization.
Disclosure of Invention
The invention aims to solve the problem of resource limitation in the prior art and provide a method for solidifying desulfurization wastewater sludge into a light flame-retardant wall brick.
In order to achieve the purpose, the scheme of the invention is as follows:
a light flame-retardant wall brick containing desulfurization wastewater sludge is composed of the following raw materials in percentage by weight: 45-55% of desulfurized wastewater sludge, 33-43% of cement, 5-7% of animal protein foaming agent and the balance of water.
The desulfurization wastewater sludge is sludge produced by desulfurization wastewater treatment engineering of power plants in northern China, wherein the weight ratio of magnesium hydroxide in solid is more than 60%, and the water content of the sludge is 45-55%.
The cement is portland cement.
The animal protein foaming agent is an animal hoof and horn foaming agent.
The preparation method of the light flame-retardant wall brick containing the desulfurization wastewater sludge comprises the following specific steps: adding the desulfurized wastewater sludge and cement into a container in sequence, sealing, uniformly stirring at normal temperature, then uniformly adding water at a uniform speed, uniformly stirring to obtain slurry, injecting an animal protein foaming agent into the slurry by using a foaming machine, stirring, transferring into a molding device for casting and molding, controlling the transfer time within 20min, and then naturally curing to obtain the finished product of the light flame-retardant wall brick.
The natural maintenance method specifically comprises the following steps: maintaining for 28 days at a temperature above 10 deg.C under natural maintenance condition to obtain the final product.
The stirring conditions are as follows: the stirring time is 10-20min, and the stirring speed is 25-35 r/min.
Has the advantages that:
compared with the prior art, the invention has the following advantages:
1. the method uses the desulfurization wastewater sludge for preparing the light flame-retardant wall brick, fully utilizes waste resources, and is green and environment-friendly;
2. in the formula, the flame retardant property of the wall brick is improved by using magnesium hydroxide contained in the desulfurization wastewater sludge;
3. in the formula of the invention, animal protein foaming agent is used to form closed spherical and non-communicated pores, so that the fire resistance of the wall brick is improved, the material density is greatly reduced, and the weight is reduced.
Detailed Description
A light flame-retardant wall brick containing desulfurization wastewater sludge is composed of the following raw materials in percentage by weight: 45-55% of desulfurized wastewater sludge, 33-43% of cement, 5-7% of animal protein foaming agent and the balance of water.
Further, the desulfurization wastewater sludge is sludge produced by desulfurization wastewater treatment engineering of power plants in northern China, wherein the weight ratio of magnesium hydroxide in solids is more than 60%, and the water content of the sludge is 45-55%.
Further, the cement is portland cement, and preferably ordinary commercially available portland cement designated by reference numeral 325 or 425 is used.
The animal protein foaming agent is an animal hoof and horn foaming agent, and the animal hoof and horn foaming agent is a commercial product, and for example, the animal hoof and horn foaming agent produced by Xin Industrial and mineral machinery, Inc. of Jining Hui can be adopted.
The invention also provides a preparation method of the light flame-retardant wall brick containing the desulfurization wastewater sludge, which comprises the following specific steps: adding the desulfurized wastewater sludge and cement into a container in sequence, sealing, uniformly stirring at normal temperature, then uniformly adding water at a uniform speed, uniformly stirring to obtain slurry, injecting an animal protein foaming agent into the slurry by using a foaming machine, stirring, transferring into a molding device for casting and molding, controlling the transfer time within 20min, and then naturally curing to obtain the finished product of the light flame-retardant wall brick.
Further, the natural curing method specifically comprises the following steps: maintaining for 28 days at a temperature above 10 deg.C under natural maintenance condition to obtain the final product.
Further, the stirring conditions are as follows: the stirring time is 10-20min, and the stirring speed is 25-35 r/min.
The present invention is further illustrated by the following examples, in which the total amount of the raw materials is 50 kg.
Example 1
A light flame-retardant wall brick containing desulfurization wastewater sludge is composed of the following raw materials in percentage by weight: 45% of desulfurized wastewater sludge, 43% of cement, 5% of animal protein foaming agent and the balance of water.
The preparation method of the light flame-retardant wall brick containing the desulfurization wastewater sludge comprises the following steps: adding the desulfurization waste water sludge and cement into a container in sequence, sealing, stirring for 10min at the normal temperature of 25r/min to ensure that the desulfurization waste water sludge and the cement are uniform, then adding water at uniform speed and stirring uniformly to obtain slurry, then injecting an animal protein foaming agent into the slurry by using a foaming machine, stirring, transferring into a molding device for casting molding, controlling the transfer time within 20min, then maintaining under the natural condition of the temperature of more than 10 ℃, carrying for more than 7 days, and forming a finished product for use in 28 days.
Example 2
The difference from example 1 is that:
a light flame-retardant wall brick containing desulfurization wastewater sludge is composed of the following raw materials in percentage by weight: 48% of desulfurized wastewater sludge, 40% of cement, 6% of animal protein foaming agent and the balance of water.
Example 3
The difference from example 1 is that:
a light flame-retardant wall brick containing desulfurization wastewater sludge is composed of the following raw materials in percentage by weight: 51% of desulfurized wastewater sludge, 37% of cement, 7% of animal protein foaming agent and the balance of water.
Example 4
The difference from example 1 is that:
a light flame-retardant wall brick containing desulfurization wastewater sludge is composed of the following raw materials in percentage by weight: 53% of desulfurized wastewater sludge, 35% of cement, 7% of animal protein foaming agent and the balance of water.
Example 5
The difference from example 1 is that:
a light flame-retardant wall brick containing desulfurization wastewater sludge is composed of the following raw materials in percentage by weight: 55% of desulfurized wastewater sludge, 33% of cement, 7% of animal protein foaming agent and the balance of water.
Example 6
A light flame-retardant wall brick containing desulfurization wastewater sludge is composed of the following raw materials in percentage by weight: 55% of desulfurized wastewater sludge, 33% of cement, 7% of animal protein foaming agent and the balance of water.
The preparation method of the light flame-retardant wall brick containing the desulfurization wastewater sludge comprises the following steps: adding the desulfurization waste water sludge and cement into a container in sequence, sealing, stirring for 20min at normal temperature at 35r/min to obtain uniform slurry, adding water at uniform speed, stirring to obtain a slurry, injecting an animal protein foaming agent into the slurry by using a foaming machine, stirring, transferring into a molding device for casting molding, controlling the transfer time within 20min, and then maintaining under natural conditions at the temperature of more than 10 ℃, wherein the slurry can be carried for more than 7 days, and a finished product can be formed for use in 28 days.
Example 7
A light flame-retardant wall brick containing desulfurization wastewater sludge is composed of the following raw materials in percentage by weight: 45% of desulfurized wastewater sludge, 43% of cement, 5% of animal protein foaming agent and the balance of water.
The preparation method of the light flame-retardant wall brick containing the desulfurization wastewater sludge comprises the following steps: adding the desulfurization waste water sludge and cement into a container in sequence, sealing, stirring for 15min at normal temperature for 30r/min to obtain uniform slurry, adding water at uniform speed, stirring to obtain slurry, injecting an animal protein foaming agent into the slurry by using a foaming machine, stirring, transferring into a molding device for casting molding, controlling the transfer time within 20min, and then maintaining under natural conditions at the temperature of more than 10 ℃, wherein the slurry can be carried for more than 7 days, and a finished product can be formed for use in 28 days.
To demonstrate the effectiveness of the invention, physical property tests were carried out below using the products of examples 1 to 5 as examples:
1. setting a control group: according to the brick body material commonly used in the prior art, 4 comparison groups are arranged, namely a comparison group 1 (autoclaved fly ash brick), a comparison group 2 (perforated brick), a comparison group 3 (aerated concrete block) and a comparison group 4 (foamed concrete).
2. Setting a test group: the products of examples 1 to 5 were used in the order of test groups 1 to 5.
3. And (3) detection: the detection method is carried out according to the national relevant standards, and the detection results are shown in the following table 1, wherein in the table 1, the relevant data of the control group 1 is selected from the records in JCT 239-.
TABLE 1 comparison of the test results of the different test groups
| Item | Density kg/m3 | Thermal conductivity w/(m.K) | Compressive strength MPa |
| Control group 1 (autoclaved fly ash brick) | 1400-1500 | 0.65 | 10-20 |
| Control group 2 (perforated brick) | 800-1200 | 0.58 | 3.5-30 |
| Control group 3 (aerated concrete block) | 500-600 | 0.16-0.28 | 1.0-10 |
| Control group 4 foam concrete) | 300-1200 | 0.19-0.22 | 0.3-0.5 |
| Test group 1 | 740 | 0.17 | 0.65 |
| Test group 2 | 737 | 0.17 | 0.63 |
| Test group 3 | 732 | 0.16 | 0.58 |
| Test group 4 | 730 | 0.16 | 0.57 |
| Test group 5 | 730 | 0.16 | 0.58 |
As can be seen from Table 1, the density of the products obtained in examples 1-4 of the present invention is lower than that of control 1, control 2, and control 3, and is close to that of control 4, indicating that the weight of the present invention is close to or lighter than that of the prior art; the thermal conductivity coefficient of the invention is basically smaller than that of the comparison group 1-4, which shows that the invention has better heat preservation effect and better flame retardant property; the flame-retardant wall brick is used as a wall lining or an inner wall without bearing pressure, and the requirement on the compressive strength is lower. Half of the raw materials of the invention are derived from the sludge generated by the desulfurization wastewater treatment of the power plant, so that the cost is almost zero, and the invention completely achieves the aim of waste recycling.
While the preferred formulations of the present invention have been described, it should be understood that the invention is not limited by the above examples, and that various changes and modifications in the component proportions may be made by those skilled in the art without departing from the overall spirit of the invention, and such should be construed as being within the scope of the invention.
Claims (4)
1. The utility model provides a fire-retardant wall brick of light that contains desulfurization waste water mud which characterized in that: the composite material consists of the following raw materials in percentage by weight: 45-55% of desulfurized wastewater sludge, 33-43% of cement, 5-7% of animal protein foaming agent and the balance of water; the desulfurization wastewater sludge is sludge produced by desulfurization wastewater treatment engineering of power plants in northern China, wherein the weight ratio of magnesium hydroxide in solid is more than 60%, the water content of the sludge is 45-55%, and the animal protein foaming agent is an animal hoof and horn foaming agent; the preparation method of the light flame-retardant wall brick comprises the following specific steps: adding the desulfurized wastewater sludge and cement into a container in sequence, sealing, uniformly stirring at normal temperature, then uniformly adding water at a uniform speed, uniformly stirring to obtain slurry, injecting an animal protein foaming agent into the slurry by using a foaming machine, stirring, transferring into a molding device for casting and molding, controlling the transfer time within 20min, and then naturally curing to obtain the finished product of the light flame-retardant wall brick.
2. The lightweight flame-retardant wall brick containing desulfurized wastewater sludge according to claim 1, wherein: the cement is portland cement.
3. The lightweight flame-retardant wall brick containing desulfurized wastewater sludge according to claim 1, wherein: the natural maintenance method specifically comprises the following steps: maintaining for 28 days at a temperature above 10 deg.C under natural maintenance condition to obtain the final product.
4. The lightweight flame-retardant wall brick containing desulfurized wastewater sludge according to claim 1, wherein: the stirring conditions are as follows: the stirring time is 10-20min, and the stirring speed is 25-35 r/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910819979.8A CN110357543B (en) | 2019-08-31 | 2019-08-31 | Lightweight flame-retardant wall brick containing desulfurization wastewater sludge and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910819979.8A CN110357543B (en) | 2019-08-31 | 2019-08-31 | Lightweight flame-retardant wall brick containing desulfurization wastewater sludge and preparation method thereof |
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| CN110357543A CN110357543A (en) | 2019-10-22 |
| CN110357543B true CN110357543B (en) | 2021-12-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100796722B1 (en) * | 2006-12-29 | 2008-01-24 | 한국지질자원연구원 | Method for solidifying sewage sludge |
| CN101381212B (en) * | 2008-10-24 | 2011-05-18 | 重庆大学 | Sludge building material and preparation method thereof |
| CN101851086B (en) * | 2010-03-26 | 2012-02-01 | 高密市瑞鑫新型节能建材厂 | Method for producing sludge self-insulation brick |
| CN101941820A (en) * | 2010-08-10 | 2011-01-12 | 浙江迪邦化工有限公司 | Method for making baking-free bricks by using dye waste water coagulated sludge and baking-free bricks |
| CN102225857B (en) * | 2011-04-21 | 2013-04-17 | 株洲政中新型环保免烧砖有限公司 | Non-burnt brick produced by sludge and producing method thereof |
| CN102643070B (en) * | 2012-05-11 | 2013-10-16 | 同济大学 | Ceramsite heat-preservation building block using non-calcined desulfurized gypsum as main cementing material and preparation method thereof |
| KR101495599B1 (en) * | 2013-05-06 | 2015-02-26 | 박재석 | The manufacturing method of block using industrial byproducts |
| CN104291746A (en) * | 2014-09-04 | 2015-01-21 | 上海露蕾化工（六安）有限公司 | Flame retardant heat preservation wallboard and preparation method thereof |
| CN104230280B (en) * | 2014-09-12 | 2017-01-18 | 武汉理工大学 | Low-shrinkage sludge ceramsite alkali-activated full-slag foam concrete plate and preparation method thereof |
| US20190002343A1 (en) * | 2015-07-13 | 2019-01-03 | Joshua Wade Hargrove | Method of fabrication of a lightweight aggregate and product formed from paper mill sludge |
| CN106430794A (en) * | 2016-12-20 | 2017-02-22 | 大唐国际化工技术研究院有限公司 | Resourceful treatment method and treatment system for desulfuration wastewater |
| CN107673719A (en) * | 2017-11-02 | 2018-02-09 | 中晶蓝实业有限公司 | The method of flue gas desulfurization and denitrification production light concrete product based on red mud |
| CN107954659A (en) * | 2017-11-30 | 2018-04-24 | 清远绿由环保科技有限公司 | A kind of foamed light heat-preserving wall produced with electroplating sludge and its manufacture method |
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