CN113307650A - Method for firing light ceramsite by using subway waste soil and machine-made sand tail mud - Google Patents
Method for firing light ceramsite by using subway waste soil and machine-made sand tail mud Download PDFInfo
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- 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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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
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Abstract
The invention discloses a method for firing light ceramsite by utilizing subway waste soil and machine-made sand tail mud, which solves the problem of environmental pollution caused by the waste soil such as the subway waste soil and the machine-made sand tail mud, and the prepared product is green and environment-friendly and has high additional value. The production process comprises the following steps: firstly, preprocessing the waste soil of the subway and the machine-made sand tail mud, and secondly, drying the preprocessed waste soil of the subway and the machine-made sand tail mud; thirdly, mixing and preparing the dried waste soil of the subway, the machine-made sand tail mud and the additive; fourthly, extruding the mixed materials into a blank; fifthly, sintering the ceramsite blank in a kiln. The invention uses the waste soil of the subway and the machine-made sand tail mud as main raw materials to fire the light ceramsite. The method not only solves the environmental pollution of the waste soil of the subway and the machine-made sand tail mud, but also realizes the full utilization of resources, replaces the clay required by the traditional ceramsite preparation, effectively protects the land resources and reduces the preparation cost. The fired light ceramsite has the characteristics of low water absorption, low density, high strength, good heat insulation effect and the like.
Description
Technical Field
The invention relates to a firing method of light ceramsite.
Background
According to estimation, the earth volume generated by the construction of one subway station is as much as 8.7 ten thousand cubic meters, about 6.8 ten thousand cubic meters are generated by the construction of a subway tunnel with the length of 1 kilometer and the diameter of 6 meters, according to the statistics of a Chinese rail transit network, 46 cities with subway systems in continental areas exist by 2019, and in 299 road sections which are being constructed, the generation amount of abandoned subway soil is huge. The large amount of waste soil is a problem in clearing, transporting, stacking and absorbing. From the whole situation of the whole country, the method mainly uses centralized stacking and uses recycling as assistance, and is the main treatment mode of the construction waste at present. If the abandoned subway soil is directly accumulated in a large amount or buried in mine holes, potential geological hazards exist and water resources are polluted. The other raw material machine-made sand tail mud for firing the light ceramsite contains a large amount of pollutants, and the main method for disposing the machine-made sand tail mud is landfill, so that natural disasters and waste of land resources are caused by improper piling in the disposal process.
At present, the waste subway soil and machine-made sand tail mud are utilized for recycling, such as manufacturing concrete filler, brick making, firing ceramsite and the like. The existing defects are that the researched method for firing the ceramsite by the sludge basically uses machine-made sand tail mud as a raw material additive, so that the utilization rate of the sludge is low; the fired ceramsite has the problems of large density, high water absorption and the like, and the application of ceramsite products and the development of ceramsite production enterprises are greatly limited.
Disclosure of Invention
The invention aims to solve the problems in the process of treating and disposing the waste soil and the tail mud, and develops a new way for comprehensively recycling the waste soil and the machine-made sand tail mud of the subway, aiming at the defects of the treatment method of the waste soil and the machine-made sand tail mud of the subway at the present stage by utilizing the characteristics of the waste soil and the machine-made sand tail mud of the subway, namely the waste soil and the machine-made sand tail mud of the subway are used for firing light ceramsite, thereby realizing the recycling of the polluted waste.
The preparation method of the light ceramsite by burning the metro waste soil and the machine-made sand tail mud comprises the following steps: firstly, respectively carrying out sorting pretreatment on the waste soil of the subway and the machine-made sand tail mud through washing equipment, and extracting coarse aggregate to enable the sand content to be 0-5%; secondly, respectively carrying out filter pressing on the sorted waste soil slurry and tail mud slurry by using a plate-and-frame filter press to ensure that the water content of the waste soil slurry and the tail mud slurry is 35-50%; thirdly, mixing and stirring the waste soil and the tail mud after filter pressing with additives according to the mass percentage (60%: 40%) -40%: 60%; fourthly, extruding on a double-roller extruder to obtain a ceramsite blank with the particle size of 8-12 mm; fifthly, firing the ceramsite blank in a kiln, namely heating the temperature to 200 ℃, keeping the temperature for 1-2 min, then heating the temperature to 1200 ℃ at a constant speed, keeping the temperature for 1-2 min, and then taking the ceramsite blank out of the kiln. Wherein the additive in the third step is sodium oxide, and the dosage of the additive is 0.5-1.0%.
The invention takes the subway waste soil and the machine-made sand tail mud as main raw materials, and provides a new idea for the disposal of the subway waste soil and the machine-made sand tail mud; the two are wastes, so that the cost for producing the ceramsite is reduced, the environmental problems caused by solid waste landfill such as the waste soil of the subway, the machine-made sand tailings and the like are reduced, the resource utilization is realized, and the environment benefit, the social benefit and the economic benefit are obvious.
The main inorganic component of the machine-made sand tail mud is Si02，A12O3，Fe203,K2O, and the like, and simultaneously the sand making tail mud also contains a large amount of organic components, and organic matters can generate small molecular gas substances such as CO in the high-temperature preparation process2And the like, which is favorable for forming porous (fine honeycomb micropores) light ceramsite. The machine-made sand tail mud is rich in main components such as Si0 forming ceramsite2，A12O3，Fe203And the inorganic components are beneficial to forming the ceramsite with low water absorption, low density and high strength.
The light ceramsite sintered by the subway waste soil and the machine-made sand tail mud can be used for producing novel high-quality building materials such as light ceramsite wallboards, building blocks and the like; the invention solves the problem of environmental pollution caused by the spoil such as the spoil of the subway, the machine-made sand tailings and the like.
The invention utilizes the waste soil of the subway and the machine-made sand tail mud to fire the light ceramsite, the water absorption rate of the light ceramsite is 10.0-12.0%, and the bulk density of the light ceramsite is 200-600 kg/m3The cylinder pressure strength is 0.8-5.0 MPa, the content of sulfide and sulfate is 0-1.0%, and the distribution aperture of ceramsite is 3-30 mm. The light ceramsite has the characteristics of low water absorption, low density, high strength and the like, is suitable for producing high-quality novel building materials such as ceramsite wallboards, building blocks and the like, and has high market acceptance.
Detailed Description
The preparation method of the light ceramsite by burning the waste soil of the subway and the machine-made sand tail mud comprises the following steps of firstly, respectively carrying out separation pretreatment on the waste soil of the subway taken from the fourth-line chaste iron ridge section of the Minhou subway and the machine-made sand tail mud taken from the Gangkou Yanfeng mountain of the Lianjiang river, and extracting coarse aggregate to ensure that the sand content is 4%; secondly, respectively carrying out filter pressing on the sorted waste soil slurry and tail mud slurry by using a plate-and-frame filter press to ensure that the water content is 37%; thirdly, the dried spoil and the tail mud are 60 percent by mass: mixing 40% of the additive with the additive and stirring; fourthly, extruding on a double-roller extruder to obtain a ceramsite blank with the particle size of 8-12 mm; fifthly, firing the ceramsite blank in a kiln, namely heating the temperature to 200 ℃, keeping the temperature for 2 min, then heating the temperature to 1200 ℃ at a constant speed, keeping the temperature for 2 min, and then taking the ceramsite blank out of the kiln.
In the third step of the embodiment, the dried metro spoil and the machine-made sand tailing mud are uniformly mixed according to a certain proportion, so that the problem that the product performance is influenced by the difference between individual products caused by different densities and particle sizes of the mixed raw materials is solved.
In the third step of the embodiment, the dosage of the additive sodium oxide is 0.2%, and the addition of the additive can reduce the melting point and the gas generation.
Si0 in the mixed material in the third step of the embodiment260% of Al203Content of (3%) Fe203The content is 5%.
The second embodiment is as follows: the present embodiment is different from the first embodiment in that the water content in the first step is 37%. Other steps and parameters are the same as those in the first embodiment.
The third concrete implementation mode: the present embodiment is different from the first embodiment in that the water content in the first step is 45%. Other steps and parameters are the same as those in the first embodiment.
The fourth specific implementation mode is different from the first to the third specific implementation modes in that the mass percentages of the shield residual soil particles and the river sludge particles in the third step are 50%: 50%, and the other steps and parameters are the same as those in one of the first to third embodiments.
Fifth embodiment, the difference between this embodiment and the first to the fourth embodiment is that the particle size of the ceramsite blank in the fourth step is 8 mm. Other steps and parameters are the same as in one of the first to fourth embodiments.
Sixth embodiment is different from the first to fifth embodiments in that the additive in the third step is sodium oxide, and the amount of the additive is 0.1%, and other steps and parameters are the same as those in the first to fifth embodiments.
The preparation method of the lightweight ceramsite by burning the metro spoil and the machine-made sand tail mud comprises the following steps of firstly, respectively carrying out sorting pretreatment on the metro spoil and the machine-made sand tail mud by using water washing equipment, and extracting coarse aggregate to ensure that the sand content is 3%; secondly, respectively carrying out filter pressing on the sorted waste soil slurry and tail mud slurry by using a plate-and-frame filter press to ensure that the water content of the waste soil slurry and the tail mud slurry is 35%; thirdly, the waste soil and the tail mud after filter pressing are 70 percent by mass: mixing 30% of the additive with the additive and stirring; fourthly, extruding on a double-roller extruder to obtain a ceramsite blank with the particle size of 8-12 mm; fifthly, firing the ceramsite blank in a kiln, namely heating the temperature to 200 ℃, keeping the temperature for 1min, then heating the temperature to 1200 ℃ at a constant speed, keeping the temperature for 1min, and then taking the ceramsite blank out of the kiln. Wherein the dosage of the additive sodium oxide in the third step is 0.15 percent.
In the first step of the present embodiment, the water content is higher than 35%.
The light ceramsite sintered from the metro spoil and the machine-made sand tailings in the embodiment has the water absorption rate of 8 percent and the bulk density of 300 kg/m3Cylinder pressure greater than 1.5MPa, apparent density 268kg/m3The distribution aperture of the ceramsite is 15mm, and the content of sulfide and sulfate is 0.1 percent.
The specific implementation method nine: the preparation method of the light ceramsite by burning the metro spoil and the machine-made sand tail mud comprises the following steps: firstly, separating and pretreating the waste subway soil and the machine-made sand tail mud by using water washing equipment respectively, and extracting coarse aggregate to ensure that the sand content is 5%; secondly, respectively carrying out filter pressing on the sorted waste soil slurry and tail mud slurry by using a plate-and-frame filter press to ensure that the water content of the waste soil slurry and the tail mud slurry is 45%; thirdly, the dried spoil and the dried tail mud are 65 percent by mass: mixing 35% of the mixture with additives and stirring; fourthly, extruding on a double-roller extruder to obtain a ceramsite blank with the particle size of 8-12 mm; fifthly, firing the ceramsite blank in a kiln, namely heating the temperature to 200 ℃, keeping the temperature for 2 min, then heating the temperature to 1200 ℃ at a constant speed, keeping the temperature for 2 min, and then taking the ceramsite blank out of the kiln. Wherein the dosage of the additive sodium oxide in the third step is 0.25 percent.
The machine-made sand tailings in the first step of the embodiment have a water content higher than 35%.
The light ceramsite fired by the metro spoil and the machine-made sand tailings in the embodiment has the water absorption of 7 percent and the bulk density of 350 kg/m3A cylinder pressure of 1.3MPa and an apparent density of 268kg/m3The distribution aperture of the ceramsite is 18mm, and the content of sulfide and sulfate is 0.2 percent.
Claims (4)
1. A method for firing light ceramsite by utilizing subway waste soil and machine-made sand tail mud is characterized by comprising the following steps: firstly, separating and pretreating metro spoil and machine-made sand tail mud by washing equipment respectively, and extracting coarse aggregate to obtain spoil mud and tail mud, wherein the sand content is 0-5%; secondly, respectively carrying out filter pressing on the sorted spoil slurry and tail mud slurry by using a plate-and-frame filter press to obtain spoil and tail mud, wherein the water content of the spoil and the tail mud is 35-50%; thirdly, mixing and stirring the waste soil and the tail mud after filter pressing with additives according to the mass percentage (60%: 40%) -40%: 60%; wherein the additive is sodium oxide, and the dosage of the additive is 0.1-0.3% of the total amount of the waste soil and the tail mud; fourthly, extruding on a double-roller extruder to obtain a ceramsite blank with the particle size of 8-12 mm; fifthly, firing the ceramsite blank in a kiln, namely heating the temperature to 200 ℃, keeping the temperature for 1-2 min, then heating the temperature to 1200 ℃ at a constant speed, keeping the temperature for 1-2 min, and then taking the ceramsite blank out of the kiln.
2. The method for firing the light ceramsite by using the metro spoil and the machine-made sand tailings according to the claim 1, wherein the water content of the spoil slurry and the tailings slurry obtained in the step one is 35-40%.
3. The method for firing the light-weight ceramsite by using the metro spoil and the machine-made sand tailings as claimed in claim 2, wherein the mass percentages of the spoil slurry and the tailings slurry after pressure filtration in the third step are (60%: 40%) to (40%: 60%).
4. The method for firing the light-weight ceramsite by using the metro spoil and the machine-made sand tailing mud according to claim 3, wherein the particle size of the ceramsite blank in the fourth step is 9-10 mm.
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| CN202110711849.XA CN113307650A (en) | 2021-06-25 | 2021-06-25 | Method for firing light ceramsite by using subway waste soil and machine-made sand tail mud |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113831108A (en) * | 2021-09-30 | 2021-12-24 | 杭州奥兴筑友科技有限公司 | Method for preparing light ceramsite by using machine-made sand sludge |
| CN115572148A (en) * | 2022-09-26 | 2023-01-06 | 宁波中淳高科股份有限公司 | Method for preparing high-strength aggregate by using machine-made sand sludge and application of method |
| CN116332622A (en) * | 2023-03-14 | 2023-06-27 | 西南科技大学 | Method for preparing high-strength ceramsite by using engineering waste soil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113831108A (en) * | 2021-09-30 | 2021-12-24 | 杭州奥兴筑友科技有限公司 | Method for preparing light ceramsite by using machine-made sand sludge |
| CN115572148A (en) * | 2022-09-26 | 2023-01-06 | 宁波中淳高科股份有限公司 | Method for preparing high-strength aggregate by using machine-made sand sludge and application of method |
| CN116332622A (en) * | 2023-03-14 | 2023-06-27 | 西南科技大学 | Method for preparing high-strength ceramsite by using engineering waste soil |
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