CN107337466B - Coal gangue ceramsite and preparation method thereof - Google Patents
Coal gangue ceramsite and preparation method thereof Download PDFInfo
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- CN107337466B CN107337466B CN201610864389.3A CN201610864389A CN107337466B CN 107337466 B CN107337466 B CN 107337466B CN 201610864389 A CN201610864389 A CN 201610864389A CN 107337466 B CN107337466 B CN 107337466B
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- 239000003245 coal Substances 0.000 title claims abstract description 135
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 83
- 239000004575 stone Substances 0.000 claims abstract description 41
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 35
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 31
- 239000010881 fly ash Substances 0.000 claims abstract description 30
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 20
- 239000004088 foaming agent Substances 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000005453 pelletization Methods 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 24
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical group O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 24
- 239000011812 mixed powder Substances 0.000 claims description 19
- 238000005498 polishing Methods 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 14
- 229910052593 corundum Inorganic materials 0.000 claims description 14
- 238000000227 grinding Methods 0.000 claims description 14
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 14
- 238000007873 sieving Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 12
- 229910052681 coesite Inorganic materials 0.000 claims description 10
- 229910052906 cristobalite Inorganic materials 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- 229910052682 stishovite Inorganic materials 0.000 claims description 10
- 229910052905 tridymite Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 4
- 239000004566 building material Substances 0.000 abstract description 2
- 239000002985 plastic film Substances 0.000 description 6
- 229920006255 plastic film Polymers 0.000 description 6
- 238000011056 performance test Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- C04B33/00—Clay-wares
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Abstract
A coal gangue ceramsite and a preparation method thereof, belonging to the technical field of building materials. The gangue ceramsite is prepared from gangue powder, polished stone powder, fly ash, a foaming agent, an auxiliary agent and a water glass solution. The preparation method of the coal gangue ceramsite comprises the following steps: (1) preparing materials; (2) mixing materials; (3) pelletizing; (4) presintering at 450-550 ℃, preserving heat for 10-20 min, continuing heating to 1100-1250 ℃, roasting, preserving heat for 30-60 min, cooling to 400-600 ℃ along with the furnace, taking out, and naturally cooling to room temperature to obtain the coal gangue ceramsite. The light coal gangue ceramsite uses coal gangue and waste polished stone powder as main components, and is low in cost. The light coal gangue ceramsite can improve the technical performances of the existing coal gangue ceramsite such as cylinder pressure strength, water absorption and the like, and has the characteristic of light weight.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to coal gangue ceramsite and a preparation method thereof.
Background
The coal gangue is a material produced along with coal in the coal mining process, the material is a waste material eliminated after coal dressing, the waste material is accumulated around a mine after mining, occupies a large area of land, and damages the surrounding natural environment after being blown by wind, rain and sun all the year round. In order to solve the problem of environmental resource damage caused by the coal gangue, the utilization problem of the coal gangue needs to be solved urgently. At present, many researchers are actively researching and utilizing the coal gangue, but the coal gangue is mostly used as aggregate to replace stones in concrete to produce concrete for buildings, and the coal gangue is also used for producing ceramsite, but most of the coal gangue is directly sintered to produce broken stone type ceramsite or coal gangue ceramsite with low strength, the ceramsite meets the standard of GB/T17431-2010 light aggregate and test method thereof, but the production of high-strength ceramsite by the coal gangue is a key problem in utilization of the coal gangue. This problem is urgently to be solved.
Chinese patent CN01141408.1 discloses "a coal gangue ceramsite and a preparation method thereof", wherein 75-85% of coal gangue is mixed with clay, shale and anthracite powder and sintered to prepare the ceramsite. Chinese patent CN200610019343.8 discloses a method for preparing coal gangue ceramsite, which comprises the following raw material components by weight percent: 30-95% of coal gangue, 5-70% of feldspar, 0-5% of quartz, 0-10% of iron tailings and sintering to prepare ceramsite. The ceramsite provided by the invention is prepared by taking coal gangue powder and waste polishing stone powder as main raw materials and adding fly ash, a foaming agent, an auxiliary agent and the like. The sintered haydite is produced with gangue, polished stone powder and other industrial waste and has bulk density of 510Kg/m3The cylinder pressure strength can reach 6.31MPa, which is superior to the prior achievements.
Disclosure of Invention
The invention aims to overcome the defects of the existing coal gangue ceramsite production technology and provides coal gangue ceramsite and a preparation method thereof. The coal gangue ceramsite can improve the technical performances of the existing coal gangue ceramsite such as cylinder pressure strength, water absorption and the like, and has the characteristic of light weight.
The gangue ceramsite is prepared from gangue powder, polished stone powder, fly ash, a foaming agent, an auxiliary agent and a water glass solution;
according to the mass ratio: coal gangue powder, polished stone powder and fly ash are (1.8-2.2): (0.5-1);
according to the mass ratio, the total mass of the foaming agent, the gangue powder, the polishing stone powder and the fly ash is (3-7) to 100;
according to the mass ratio, the total mass of the auxiliary agent, the gangue powder, the polishing stone powder and the fly ash is (0.5-1) to 100;
according to the mass ratio, the total mass of the water glass solution, the coal gangue powder, the polishing stone powder and the fly ash is (6-7) to 100;
the coal gangue powder is prepared by crushing coal gangue, grinding by using a ball mill and sieving;
the particle size of the coal gangue powder is 0.10-0.16 mm.
The polishing stone powder comprises SiO2、Al2O3MgO and CaO; wherein, SiO2Mass fraction is more than or equal to 65 percent, and Al2O3The mass fraction is more than or equal to 15 percent.
The foaming agent is sodium carbonate.
The auxiliary agent is manganese dioxide.
The modulus of the water glass solution is 2.6-3.0, and the concentration of the water glass solution is 1-2%.
The bulk density of the coal gangue ceramsite is 510-650 kg/m3The 1d water absorption rate is 5-7%, and the cylinder pressure strength is 6.0-8.0 MPa.
The invention relates to a preparation method of coal gangue ceramsite, which comprises the following steps:
(1) stock preparation
Grinding and screening the coal gangue to prepare coal gangue powder;
(2) mixing material
Uniformly mixing the coal gangue, the polished stone powder, the fly ash, the foaming agent and the auxiliary agent according to the proportion to prepare mixed powder, adding a water glass solution into the mixed powder, and stewing the mixture to prepare a mixed material;
(3) pelletizing
Pelletizing the mixed material, and naturally drying to obtain dry ceramic balls;
(4) roasting
And (3) pre-sintering the dried ceramic balls at 450-550 ℃, preserving heat for 10-20 min, continuously heating to 1100-1250 ℃, roasting, preserving heat for 30-60 min, cooling to 400-600 ℃ along with the furnace, taking out, and naturally cooling to room temperature to obtain the coal gangue ceramsite.
In the step (1), the screening is performed by adopting a 0.16mm screen;
in the step (2), the stewing material is a plastic film covered mixed material, and is placed statically at normal temperature, wherein the placing time is determined according to the amount of the mixed material, and is preferably 10-30 min;
the purpose of the stewing material is to enable the mixed material to reach a uniform and wet state;
in the step (3), the pelletizing is formed by hand or rolling;
the manual forming is generally suitable for laboratory or small-batch production, and the rolling forming is generally suitable for industrial production or large-batch production.
The step (4) adopts a mode of pre-burning at low temperature, preserving heat and then roasting at high temperature, and has the advantage of energy conservation.
The process method for evaluating and preparing the ultralight coal gangue ceramsite takes the bulk density as a main evaluation index and takes the water absorption and the cylinder pressure strength as auxiliary evaluation indexes.
In the step (4), the roasting condition is preferably that the roasting furnace is preheated for 10-15 min at 500-550 ℃, and is kept at the constant temperature of 1100-1200 ℃ for 30-45 min.
Compared with the prior art, the coal gangue ceramsite and the preparation method thereof have the following advantages:
1. the method does not need to use clay, adhesive, coal gangue, polished stone powder, fly ash and other industrial wastes, thereby saving a large amount of land and reducing the cost.
2. The coal gangue ceramsite prepared by the method has low bulk density (510.78 kg/m)3) Light weight and high cylinder pressure strength (6.31 MPa).
Detailed Description
The present invention will be described in further detail with reference to examples.
In the following examples, the test standards of the coal gangue ceramsite are tested according to GB/T17431-2010 "lightweight aggregate and test method thereof".
Example 1
A coal gangue ceramsite is prepared from coal gangue powder, polished stone powder, fly ash, a foaming agent sodium carbonate, an auxiliary agent manganese dioxide and a water glass solution; by mass, gangue powder: 5.0 kg; polishing stone powder: 2.8 kg; fly ash: 2.8 kg; sodium carbonate: 0.42 kg; manganese dioxide: 0.11 kg; water glass solution: 0.74 kg;
the coal gangue powder is coal gangue powder with the particle size of 0.10-0.16 mm, which is prepared by crushing the coal gangue, grinding the crushed coal gangue by using a ball mill and then sieving the crushed coal gangue;
the polishing stone powder comprises the following components: SiO 22、Al2O3MgO and CaO; wherein, SiO265% by mass of Al2O3The mass fraction is 15%.
The modulus of the water glass is 2.6-3.0, and the concentration of the water glass solution is 1%.
A preparation method of coal gangue ceramsite comprises the following steps:
(1) stock preparation
Grinding the coal gangue, and sieving by adopting a 0.16mm sieve to prepare coal gangue powder;
(2) mixing material
Uniformly mixing the coal gangue, the polished stone powder, the fly ash, the foaming agent and the auxiliary agent according to the proportion to prepare mixed powder, adding a water glass solution into the mixed powder, covering the mixed powder with a plastic film, standing the mixture at normal temperature for 10min, and stewing the mixture to prepare a mixed material;
(3) pelletizing
Pelletizing the mixed material, and naturally drying to obtain dry ceramic balls;
(4) roasting
Presintering the dried ceramic balls at 500 ℃, keeping the temperature for 15min, continuously heating to 1100 ℃ for roasting, respectively keeping the temperature for 30min, 45min and 60min, then cooling to 400 ℃ along with the furnace, taking out, and naturally cooling to room temperature to obtain the coal gangue ceramsite.
The performance test results of the coal gangue ceramsite prepared by the embodiment are shown in table 1.
Example 2
A coal gangue ceramsite is prepared from coal gangue powder, polished stone powder, fly ash, a foaming agent sodium carbonate, an auxiliary agent manganese dioxide and a water glass solution; by mass, gangue powder: 5.0 kg; polishing stone powder: 2.5 kg; fly ash: 2.5 kg; sodium carbonate: 0.4 kg; manganese dioxide: 0.1 kg; water glass solution: 0.6 kg;
the coal gangue powder is coal gangue powder with the particle size of 0.10-0.16 mm, which is prepared by crushing the coal gangue, grinding the crushed coal gangue by using a ball mill and then sieving the crushed coal gangue;
the polishing stone powder comprises the following components: SiO 22、Al2O3MgO and CaO; wherein, SiO267% by mass of Al2O3The mass fraction is 18%.
The modulus of the water glass is 2.6-3.0, and the concentration of the water glass solution is 2%.
A preparation method of coal gangue ceramsite comprises the following steps:
(1) stock preparation
Grinding the coal gangue, and sieving by adopting a 0.16mm sieve to prepare coal gangue powder;
(2) mixing material
Uniformly mixing the coal gangue, the polished stone powder, the fly ash, the foaming agent and the auxiliary agent according to the proportion to prepare mixed powder, adding a water glass solution into the mixed powder, covering the mixed powder with a plastic film, standing the mixture at normal temperature for 30min, and stewing the mixture to prepare a mixed material;
(3) pelletizing
Pelletizing the mixed material, and naturally drying to obtain dry ceramic balls;
(4) roasting
Presintering the dried ceramic balls at 500 ℃, keeping the temperature for 15min, continuously heating to 1100 ℃ for roasting, respectively keeping the temperature for 30min, 45min and 60min, then cooling to 400 ℃ along with the furnace, taking out, and naturally cooling to room temperature to obtain the coal gangue ceramsite.
The performance test results of the coal gangue ceramsite prepared by the embodiment are shown in table 1.
Example 3
A coal gangue ceramsite is prepared from coal gangue powder, polished stone powder, fly ash, a foaming agent sodium carbonate, an auxiliary agent manganese dioxide and a water glass solution; by mass, gangue powder: 5.0 kg; polishing stone powder: 2.3 kg; fly ash: 2.3 kg; sodium carbonate: 0.38 kg; manganese dioxide: 0.96 kg; water glass solution: 0.58 kg;
the coal gangue powder is coal gangue powder with the particle size of 0.10-0.16 mm, which is prepared by crushing the coal gangue, grinding the crushed coal gangue by using a ball mill and then sieving the crushed coal gangue;
the polishing stone powder comprises the following components: SiO 22、Al2O3MgO and CaO; wherein, SiO265% by mass of Al2O3The mass fraction is 15%.
The modulus of the water glass is 2.6-3.0, and the concentration of the water glass solution is 1%.
A preparation method of coal gangue ceramsite comprises the following steps:
(1) stock preparation
Grinding the coal gangue, and sieving by adopting a 0.16mm sieve to prepare coal gangue powder;
(2) mixing material
Uniformly mixing the coal gangue, the polished stone powder, the fly ash, the foaming agent and the auxiliary agent according to the proportion to prepare mixed powder, adding a water glass solution into the mixed powder, covering the mixed powder with a plastic film, standing the mixture at normal temperature for 10min, and stewing the mixture to prepare a mixed material;
(3) pelletizing
Pelletizing the mixed material, and naturally drying to obtain dry ceramic balls;
(4) roasting
Presintering the dried ceramic balls at 500 ℃, keeping the temperature for 15min, continuously heating to 1100 ℃ for roasting, respectively keeping the temperature for 30min, 45min and 60min, then cooling to 400 ℃ along with the furnace, taking out, and naturally cooling to room temperature to obtain the coal gangue ceramsite.
The performance test results of the coal gangue ceramsite prepared by the embodiment are shown in table 1.
Example 4
A coal gangue ceramsite is prepared from coal gangue powder, polished stone powder, fly ash, a foaming agent sodium carbonate, an auxiliary agent manganese dioxide and a water glass solution; by mass, gangue powder: 5.0 kg; polishing stone powder: 1.25 kg; fly ash: 1.25 kg; sodium carbonate: 0.25 kg; manganese dioxide: 0.38 kg; water glass solution: 0.45 kg;
the coal gangue powder is coal gangue powder with the particle size of 0.10-0.16 mm, which is prepared by crushing the coal gangue, grinding the crushed coal gangue by using a ball mill and then sieving the crushed coal gangue;
the polishing stone powder comprises the following components:SiO2、Al2O3MgO and CaO; wherein, SiO265% by mass of Al2O3The mass fraction is 15%.
The modulus of the water glass is 2.6-3.0, and the concentration of the water glass solution is 1%.
A preparation method of coal gangue ceramsite comprises the following steps:
(1) stock preparation
Grinding the coal gangue, and sieving by adopting a 0.16mm sieve to prepare coal gangue powder;
(2) mixing material
Uniformly mixing the coal gangue, the polished stone powder, the fly ash, the foaming agent and the auxiliary agent according to the proportion to prepare mixed powder, adding a water glass solution into the mixed powder, covering the mixed powder with a plastic film, standing the mixture at normal temperature for 10min, and stewing the mixture to prepare a mixed material;
(3) pelletizing
Pelletizing the mixed material, and naturally drying to obtain dry ceramic balls;
(4) roasting
Presintering the dried ceramic balls at 450 ℃, preserving heat for 20min, continuously heating to 1250 ℃, roasting, preserving heat for 30min, cooling to 600 ℃ along with the furnace, taking out, and naturally cooling to room temperature to obtain the coal gangue ceramsite. A
The performance test results of the coal gangue ceramsite prepared by the embodiment are shown in table 1.
Example 5
A coal gangue ceramsite is prepared from coal gangue powder, polished stone powder, fly ash, a foaming agent sodium carbonate, an auxiliary agent manganese dioxide and a water glass solution; by mass, gangue powder: 5.0 kg; polishing stone powder: 2.5 kg; fly ash: 2.5 kg; sodium carbonate: 0.7 kg; manganese dioxide: 0.1 kg; water glass solution: 0.7 kg;
the coal gangue powder is coal gangue powder with the particle size of 0.10-0.16 mm, which is prepared by crushing the coal gangue, grinding the crushed coal gangue by using a ball mill and then sieving the crushed coal gangue;
the polishing stone powder comprises the following components: SiO 22、Al2O3MgO and CaO; wherein, SiO268 percent of Al2O3The mass fraction is 15%.
The modulus of the water glass is 2.6-3.0, and the concentration of the water glass solution is 2%.
A preparation method of coal gangue ceramsite comprises the following steps:
(1) stock preparation
Grinding the coal gangue, and sieving by adopting a 0.16mm sieve to prepare coal gangue powder;
(2) mixing material
Uniformly mixing the coal gangue, the polished stone powder, the fly ash, the foaming agent and the auxiliary agent according to the proportion to prepare mixed powder, adding a water glass solution into the mixed powder, covering the mixed powder with a plastic film, standing the mixture at normal temperature for 10min, and stewing the mixture to prepare a mixed material;
(3) pelletizing
Pelletizing the mixed material, and naturally drying to obtain dry ceramic balls;
(4) roasting
Presintering the dried ceramic balls at 550 ℃, preserving heat for 10min, continuously heating to 1200 ℃, roasting, preserving heat for 30min, cooling to 600 ℃ along with the furnace, taking out, and naturally cooling to room temperature to obtain the coal gangue ceramsite.
The performance test results of the coal gangue ceramsite prepared by the embodiment are shown in table 1.
TABLE 1
Claims (9)
1. The coal gangue ceramsite is characterized by being prepared from coal gangue powder, polished stone powder, fly ash, a foaming agent, an auxiliary agent and a water glass solution;
according to the mass ratio: coal gangue powder: polishing stone powder: fly ash = (1.8-2.2): (0.5-1): (0.5 to 1);
according to the mass ratio, the foaming agent: the total mass of the coal gangue powder, the polished stone powder and the fly ash is = (3-7): 100, respectively;
according to the mass ratio, the auxiliary agent: the total mass of the coal gangue powder, the polished stone powder and the fly ash is = (0.5-1): 100, respectively;
according to the mass ratio, the water glass solution: the total mass of the coal gangue powder, the polished stone powder and the fly ash is = (6-7): 100, respectively;
the foaming agent is sodium carbonate; the auxiliary agent is manganese dioxide;
the polishing stone powder comprises SiO2、Al2O3MgO and CaO; wherein, SiO2Mass fraction is more than or equal to 65 percent, and Al2O3The mass fraction is more than or equal to 15 percent.
2. The coal gangue ceramsite of claim 1, wherein the particle size of the coal gangue powder is 0.10-0.16 mm.
3. The coal gangue ceramsite of claim 2, wherein the coal gangue powder with the particle size of 0.10-0.16 mm is prepared by crushing coal gangue, grinding with a ball mill and sieving.
4. The coal gangue ceramsite as set forth in claim 1, wherein the water glass solution has a modulus of 2.6-3.0 and a concentration of 1-2%.
5. The coal gangue ceramsite as set forth in claim 1, wherein the bulk density of the coal gangue ceramsite is 510-650 kg/m3The 1d water absorption rate is 5-7%, and the cylinder pressure strength is 6.0-8.0 MPa.
6. The method for preparing the coal gangue ceramsite of claim 1, which comprises the following steps:
(1) stock preparation
Grinding and screening the coal gangue to prepare coal gangue powder;
(2) mixing material
Uniformly mixing the coal gangue, the polished stone powder, the fly ash, the foaming agent and the auxiliary agent according to the proportion to prepare mixed powder, adding a water glass solution into the mixed powder, and stewing the mixture to prepare a mixed material;
(3) pelletizing
Pelletizing the mixed material, and naturally drying to obtain dry ceramic balls;
(4) roasting
And (3) pre-sintering the dried ceramic balls at 450-550 ℃, preserving heat for 10-20 min, continuously heating to 1100-1250 ℃, roasting, preserving heat for 30-60 min, cooling to 400-600 ℃ along with the furnace, taking out, and naturally cooling to room temperature to obtain the coal gangue ceramsite.
7. The method for preparing the coal gangue ceramsite as defined in claim 6, wherein in the step (1), the sieving is performed by using a 0.16mm sieve.
8. The preparation method of the coal gangue ceramsite as defined in claim 6, wherein in the step (2), the braising material is at normal temperature and is placed for 10-30 min in a static state.
9. The preparation method of the coal gangue ceramsite as claimed in claim 6, wherein in the step (4), the roasting condition is preheating at 500-550 ℃ for 10-15 min, and the constant temperature is 1100-1200 ℃ for 30-45 min.
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| CN113135679B (en) * | 2021-04-16 | 2023-05-16 | 成都中弘轨道交通环保产业股份有限公司 | Ceramsite fired by nepheline tailings and preparation method thereof |
| CN113698175A (en) * | 2021-07-28 | 2021-11-26 | 上格环境科技（上海）有限公司 | Coal gangue ceramsite and preparation method thereof |
| CN116177990A (en) * | 2023-02-13 | 2023-05-30 | 中国恩菲工程技术有限公司 | Method and system for producing ceramsite lightweight aggregate by combining coal gangue and gypsum slag |
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