CN111777406A - Process for preparing sintered heat-insulation building blocks from sand washing mud - Google Patents
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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
- C04B33/131—Inorganic additives
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- C—CHEMISTRY; METALLURGY
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- 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
- C04B33/24—Manufacture of porcelain or white ware
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- 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
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
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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
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/61—Mechanical properties, e.g. fracture toughness, hardness, Young's modulus or strength
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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
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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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)
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- Materials Engineering (AREA)
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Abstract
The invention discloses a process for preparing sintered heat-preservation building blocks from sand washing mud, which relates to the field of production of building aggregates and comprises a concentration process, a filter pressing process, a batching process, a staleness process, a forming process, a drying process and a firing process. The invention has the beneficial effects that: the invention is beneficial to reducing the discharge of waste such as mud and the like generated in the sand washing production; the invention does not use shale and other raw materials which are required to be mined in the traditional brick making process, thereby saving resources; the additive is added during the forming, and the compressive strength is improved by more than 6 percent compared with that without the additive after the curing and forming; the sintered heat-insulating building block prepared by the invention has a heat-insulating function, and the heat conductivity coefficient is less than 0.4W/m.K; the sintered heat-insulating building block prepared by the invention has small apparent density which is less than 900kg/m3, and the dead weight is saved by more than 50% compared with the traditional brick.
Description
Technical Field
The invention relates to the field of production of building aggregates, in particular to a process for preparing sintered heat-insulation building blocks from sand washing mud.
Background
In the production of sandstone, slime is often produced by sand washing, and the slime is difficult to be effectively utilized because of complicated and variable components. At present, the main treatment mode of the partial waste is mainly to discharge into a tailing pond or stockpile, the tailing pond or a dumping site needs to be built, and the tailing pond or the dumping site can bring potential safety hazards such as dam break, landslide and the like due to various factors.
In addition, at present, heat preservation measures are not taken for a plurality of buildings, particularly rural buildings, and even parts of the buildings are still built by high-energy-consumption products such as sintered red bricks. This not only causes destruction of cultivated land, but also is not beneficial to building energy saving. Energy consumption caused by heat transfer of a building is an important factor of building energy waste, so that popularization and use of energy-saving products have good significance on energy conservation and consumption reduction.
Therefore, the research on a treatment process can improve the utilization efficiency of resources and is beneficial to energy conservation and consumption reduction.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a process for preparing sintered heat-insulation building blocks from sand washing mud, solves the problem of difficult treatment of waste sand washing mud in the production of building aggregate, is favorable for protecting the ecological environment and promotes sustainable development.
The purpose of the invention is achieved by the following technical scheme: the process for preparing the sintered heat-preservation building block from the sand washing mud comprises the following steps:
step one, a concentration process: concentrating and dehydrating the waste sand washing mud in the sandstone production through a concentration and dehydration device to obtain concentrated slurry a;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b;
step three, batching process: mixing the product b obtained in the step two with the raw material c, adding water and an additive, and uniformly stirring to obtain a product d;
step four, a staling process: aging the product d obtained in the step three to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step to obtain a green brick g;
step seven, a firing process: and (5) firing the green brick g obtained in the sixth step to obtain a brick h.
As a preferable technical scheme, the concentration and dehydration equipment in the step one is one or two of a thickener and a concentration tank; and 2-50 g of flocculating agent is added into each ton of the concentrated and dehydrated solid according to the weight of the solid; the water content of the slurry a is less than or equal to 55 percent by mass.
As a preferable technical scheme, the water content mass fraction of the product b in the step two is less than or equal to 30 percent.
As a preferred technical scheme, the raw material c in the third step is one or more of mine covering soil, clay, loess, laterite, sandy soil and humus; the water content of the product d is less than or equal to 25 percent; the additive is water glass, the addition amount of the additive is 1000-5000 g per ton of the mixture according to dry weight.
As a preferable technical scheme, the staling time in the fourth step is 5-48 hours.
As a preferred technical scheme, the forming die adopted in the fifth step is a porous die, and the pore volume accounts for 50-70% of the total volume of the die; the curing molding pressure is more than or equal to 50 MPa.
As a preferable technical scheme, the drying temperature in the step six is more than or equal to 100 ℃, and the drying time is 2-5 hours.
Preferably, the firing temperature in the seventh step is 700-1100 ℃, and the firing time is 5-15 hours.
The invention has the beneficial effects that:
1. the invention is beneficial to reducing the discharge of waste such as mud and the like generated in the sand washing production;
2. the invention does not use shale and other raw materials which are required to be mined in the traditional brick making process, thereby saving resources;
3. the additive is added during the forming, and the compressive strength is improved by more than 6 percent compared with that without the additive after the curing and forming;
4. the sintered heat-insulating building block prepared by the invention has a heat-insulating function, and the heat conductivity coefficient is less than 0.4W/m.K;
5. the sintered heat-insulating building block prepared by the invention has small apparent density which is less than 900kg/m3, and the dead weight is saved by more than 50% compared with the traditional brick.
Drawings
FIG. 1 is a block diagram of the process flow of the present invention.
Detailed Description
The process flow of the invention is shown in figure 1.
Example 1: a process for preparing sintered heat-insulation building blocks from sand washing mud comprises the following steps:
step one, a concentration process: adding 5g of flocculating agent into the waste sand washing mud in the sand production per ton according to the solid weight, and then concentrating and dehydrating by using a thickener to obtain slurry a containing 45% of water by mass fraction;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b containing 17% of water by mass fraction;
step three, batching process: mixing the product b obtained in the step two with the mine covering soil according to the weight ratio of 1:1, adding water, adding 1500 g of additive water glass into each ton of mixture (according to dry weight), and uniformly stirring to obtain a product d containing 15% of water by mass;
step four, a staling process: ageing the product d obtained in the step three for 24 hours to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step by using a porous mold with the pore volume accounting for 50 percent of the total volume of the mold under the pressure of 55MPa to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step for 4 hours at the temperature of 200-250 ℃ to obtain a green brick g;
step seven, a firing process: and (3) firing the green brick g obtained in the sixth step for 5 hours at the temperature of 850-980 ℃ to obtain a brick h, wherein the brick h is the sintered heat-insulation building block.
Tests show that the compressive strength of the produced sintered heat-insulating building block is improved by 6.8% compared with the sintered heat-insulating building block without adding the additive of water glass added in the burdening process; meanwhile, the sintered heat-insulating building block has a heat-insulating function, and the heat conductivity coefficient is less than 0.22W/m.K; in addition, the sintered heat-insulating building block has small apparent density which is less than 882kg/m3, and saves 51.3 percent of dead weight compared with the traditional brick.
Example 2: a process for preparing sintered heat-insulation building blocks from sand washing mud comprises the following steps:
step one, a concentration process: adding 7g of flocculant into the waste sand washing mud in the sand production per ton according to the solid weight, and then concentrating and dehydrating by using a thickener to obtain slurry a containing 47% of water by mass fraction;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b containing 18% of water by mass fraction;
step three, batching process: mixing the product b obtained in the step two with mine covering soil according to the weight ratio of 2:1, adding water, adding 3000 g of additive water glass into each ton of mixture (according to dry weight), and uniformly stirring to obtain a product d containing 14% of water by mass;
step four, a staling process: ageing the product d obtained in the step three for 16 hours to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step by using a porous mold with the pore volume accounting for 55 percent of the total volume of the mold under the pressure of 60MPa to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step for 4.5 hours at the temperature of 240-290 ℃ to obtain a raw brick g;
step seven, a firing process: and (3) firing the green brick g obtained in the sixth step at the temperature of 750-830 ℃ for 6 hours to obtain a brick h, wherein the brick h is the sintered heat-insulation building block.
Tests show that the compressive strength of the produced sintered heat-insulating building block is improved by 6.5 percent compared with that of the sintered heat-insulating building block without adding the additive sodium silicate added in the burdening process; meanwhile, the sintered heat-insulating building block has a heat-insulating function, and the heat conductivity coefficient is less than 0.2W/m.K; in addition, the sintered heat-insulating building block has small apparent density which is less than 811kg/m3, and saves 53.6 percent of dead weight compared with the traditional brick.
Example 3: a process for preparing sintered heat-insulation building blocks from sand washing mud comprises the following steps:
step one, a concentration process: adding 5g of flocculant into the waste sand washing mud in the sand production per ton according to the solid weight, and then concentrating and dehydrating by using a thickener to obtain slurry a containing 42% of water by mass fraction;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b containing 19.5% of water by mass fraction;
step three, batching process: mixing the product b obtained in the step two with mine covering soil according to the weight ratio of 2.5:1, adding water, adding 4000 g of additive water glass into each ton of mixture (according to dry weight), and uniformly stirring to obtain a product d containing 17.6% of water by mass;
step four, a staling process: ageing the product d obtained in the step three for 48 hours to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step by using a porous mold with the pore volume accounting for 60 percent of the total volume of the mold under the pressure of 60MPa to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step for 3 hours at the temperature of 300-350 ℃ to obtain a green brick g;
step seven, a firing process: and (3) firing the green brick g obtained in the sixth step for 5.5 hours at the temperature of 850-900 ℃ to obtain a brick h, wherein the brick h is the sintered heat-insulation building block.
Tests show that the compressive strength of the produced sintered heat-insulating building block is improved by 7.3% compared with the sintered heat-insulating building block without adding the additive of water glass added in the burdening process; meanwhile, the sintered heat-insulating building block has a heat-insulating function, and the heat conductivity coefficient is less than 0.19W/m.K; in addition, the sintered heat-insulating block has small apparent density which is less than 737kg/m3, and the dead weight is saved by 56.6 percent compared with the traditional brick.
Example 4: a process for preparing sintered heat-insulation building blocks from sand washing mud comprises the following steps:
step one, a concentration process: adding 5g of flocculant into the waste sand washing mud in the sand production per ton according to the solid weight, and then concentrating and dehydrating by using a thickener to obtain slurry a containing 41% of water by mass fraction;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b containing 18.3% of water by mass fraction;
step three, batching process: mixing the product b obtained in the step two with mine covering soil according to the weight ratio of 3.5:1, adding water, adding 3000 g of additive water glass into each ton of mixture (according to dry weight), and uniformly stirring to obtain a product d containing 16.2% of water by mass;
step four, a staling process: ageing the product d obtained in the step three for 18 hours to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step by using a porous mold with the pore volume accounting for 50 percent of the total volume of the mold under the pressure of 70MPa to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step for 5 hours at the temperature of 280-330 ℃ to obtain a green brick g;
step seven, a firing process: and (3) firing the green brick g obtained in the sixth step at the temperature of 820-880 ℃ for 6 hours to obtain a brick h, wherein the brick h is the sintered heat-insulation building block.
Tests show that the compressive strength of the produced sintered heat-insulating building block is improved by 6.3% compared with the sintered heat-insulating building block without adding the additive of water glass added in the burdening process; meanwhile, the sintered heat-insulating building block has a heat-insulating function, and the heat conductivity coefficient is less than 0.23W/m.K; in addition, the sintered heat-insulating building block has small apparent density which is less than 883kg/m3, and saves 51.5 percent of dead weight compared with the traditional brick.
Example 5: a process for preparing sintered heat-insulation building blocks from sand washing mud comprises the following steps:
step one, a concentration process: adding 14g of flocculating agent into the waste sand washing mud in the sand production according to the solid weight per ton, and then concentrating and dehydrating by using a thickener to obtain slurry a containing 43% of water by mass fraction;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b containing 17.7% of water by mass fraction;
step three, batching process: mixing the product b obtained in the second step with mine covering soil according to the weight ratio of 1:2, adding water, adding 4500 g of additive water glass into each ton of mixture (according to dry weight), and uniformly stirring to obtain a product d containing 13% of water by mass;
step four, a staling process: ageing the product d obtained in the step three for 30 hours to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step by using a porous mold with the pore volume accounting for 65 percent of the total volume of the mold under the pressure of 80MPa to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step for 4.5 hours at the temperature of 300-350 ℃ to obtain a raw brick g;
step seven, a firing process: and (3) firing the green brick g obtained in the sixth step for 5.5 hours at the temperature of 780-850 ℃ to obtain a brick h, wherein the brick h is the sintered heat-insulation building block.
Tests show that the compressive strength of the produced sintered heat-insulating building block is improved by 7.6% compared with the sintered heat-insulating building block without adding the additive of water glass added in the burdening process; meanwhile, the sintered heat-insulating building block has a heat-insulating function, and the heat conductivity coefficient is less than 0.17W/m.K; in addition, the sintered heat-insulating building block has small apparent density which is less than 659kg/m3, and saves 57.8 percent of dead weight compared with the traditional brick.
It should be understood that equivalent substitutions and changes to the technical solution and the inventive concept of the present invention should be made by those skilled in the art to the protection scope of the appended claims.
Claims (8)
1. A process for preparing sintered heat-insulation building blocks from sand washing mud is characterized by comprising the following steps: the method comprises the following steps:
step one, a concentration process: concentrating and dehydrating the waste sand washing mud in the sandstone production through a concentration and dehydration device to obtain concentrated slurry a;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b;
step three, batching process: mixing the product b obtained in the step two with the raw material c, adding water and an additive, and uniformly stirring to obtain a product d;
step four, a staling process: aging the product d obtained in the step three to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step to obtain a green brick g;
step seven, a firing process: and (5) firing the green brick g obtained in the sixth step to obtain a brick h.
2. The process for manufacturing the sintered heat-preservation building blocks from the sand-washing mud as claimed in claim 1, wherein the process comprises the following steps: the concentration and dehydration equipment in the step one is one or two of a thickener and a concentration tank; and 2-50 g of flocculating agent is added into each ton of the concentrated and dehydrated solid according to the weight of the solid; the water content of the slurry a is less than or equal to 55 percent by mass.
3. The process for manufacturing the sintered heat-preservation building blocks from the sand-washing mud as claimed in claim 1, wherein the process comprises the following steps: the water content mass fraction of the product b in the step two is less than or equal to 30 percent.
4. The process for manufacturing the sintered heat-preservation building blocks from the sand-washing mud as claimed in claim 1, wherein the process comprises the following steps: the raw material c in the third step is one or more of mine covering soil, clay, loess, laterite, sandy soil and humus; the mass fraction of water contained in the product d is less than or equal to 25 percent; the additive is water glass, the addition amount of the additive is 1000-5000 g per ton of the mixture according to dry weight.
5. The process for manufacturing the sintered heat-preservation building blocks from the sand-washing mud as claimed in claim 1, wherein the process comprises the following steps: and the staling time in the fourth step is 5-48 hours.
6. The process for manufacturing the sintered heat-preservation building blocks from the sand-washing mud as claimed in claim 1, wherein the process comprises the following steps: the forming die adopted in the forming procedure in the step five is a porous die, and the pore volume accounts for 50-70% of the total volume of the die; the molding pressure is more than or equal to 50 MPa.
7. The process for manufacturing the sintered heat-preservation building blocks from the sand-washing mud as claimed in claim 1, wherein the process comprises the following steps: and sixthly, drying at the temperature of more than or equal to 100 ℃ for 2-5 hours.
8. The process for manufacturing the sintered heat-preservation building blocks from the sand-washing mud as claimed in claim 1, wherein the process comprises the following steps: and seventhly, the firing temperature is 700-1100 ℃, and the firing time is 5-15 hours.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112174558A (en) * | 2020-10-26 | 2021-01-05 | 湖南工学院 | Method for preparing active mineral admixture by using sand washing mud |
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|---|---|---|---|---|
| CN102603350A (en) * | 2012-03-28 | 2012-07-25 | 郑州振东科技有限公司 | Method for preparing foamed ceramic insulation board by using shale |
| CN110078530A (en) * | 2019-05-05 | 2019-08-02 | 东南大学 | A kind of preparation method of high performance sintered insulating brick |
| CN111004012A (en) * | 2019-11-28 | 2020-04-14 | 上海智平基础工程有限公司 | Sintering method brick making process for building waste slurry |
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2020
- 2020-06-16 CN CN202010548480.0A patent/CN111777406A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102603350A (en) * | 2012-03-28 | 2012-07-25 | 郑州振东科技有限公司 | Method for preparing foamed ceramic insulation board by using shale |
| CN110078530A (en) * | 2019-05-05 | 2019-08-02 | 东南大学 | A kind of preparation method of high performance sintered insulating brick |
| CN111004012A (en) * | 2019-11-28 | 2020-04-14 | 上海智平基础工程有限公司 | Sintering method brick making process for building waste slurry |
Non-Patent Citations (1)
| Title |
|---|
| 罗民华等: "《多孔陶瓷实用技术》", 31 March 2006, 中国建材工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112174558A (en) * | 2020-10-26 | 2021-01-05 | 湖南工学院 | Method for preparing active mineral admixture by using sand washing mud |
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