CN115321931A - Baking-free ceramsite and preparation method thereof - Google Patents
Baking-free ceramsite and preparation method thereof Download PDFInfo
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- CN115321931A CN115321931A CN202210929383.5A CN202210929383A CN115321931A CN 115321931 A CN115321931 A CN 115321931A CN 202210929383 A CN202210929383 A CN 202210929383A CN 115321931 A CN115321931 A CN 115321931A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 27
- 239000011707 mineral Substances 0.000 claims abstract description 27
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- 239000000843 powder Substances 0.000 claims abstract description 26
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000010931 gold Substances 0.000 claims abstract description 24
- 229910052737 gold Inorganic materials 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000002699 waste material Substances 0.000 claims abstract description 18
- 239000002893 slag Substances 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000000919 ceramic Substances 0.000 claims abstract description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 5
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- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000001723 curing Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 239000004927 clay Substances 0.000 description 4
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- 238000006243 chemical reaction Methods 0.000 description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229920006389 polyphenyl polymer Polymers 0.000 description 3
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- 230000009102 absorption Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000404 calcium aluminium silicate Substances 0.000 description 2
- 235000012215 calcium aluminium silicate Nutrition 0.000 description 2
- WNCYAPRTYDMSFP-UHFFFAOYSA-N calcium aluminosilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O WNCYAPRTYDMSFP-UHFFFAOYSA-N 0.000 description 2
- 229940078583 calcium aluminosilicate Drugs 0.000 description 2
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- 239000003245 coal Substances 0.000 description 2
- 239000012792 core layer Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 230000005484 gravity Effects 0.000 description 2
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- 238000006703 hydration reaction Methods 0.000 description 2
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- 238000005096 rolling process Methods 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
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- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 1
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- 229910018557 Si O Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
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- 239000003513 alkali Substances 0.000 description 1
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- 239000011575 calcium Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- 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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- 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)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the field of solid waste utilization, and particularly relates to a non-fired ceramsite and a preparation method thereof. The structure of the ceramsite comprises: the ceramic particle comprises a core and a ceramic particle outer wall wrapping the outer surface of the core; the outer wall of the ceramsite is prepared from 10-30 parts of waste mineral aggregate with the pH value being more than 9, 20-50 parts of gold tailings and 30-50 parts of mineral powder; the waste mineral aggregate with the pH value of more than 9 is one or more of red mud, iron tailing powder, carbide slag and lithium slag. The invention mixes several solid waste materials and adopts a sintering-free process to prepare the ceramsite, thereby changing waste into valuable and solving the problem of solid waste accumulation, and the production process is environment-friendly, does not need heating in the whole process, saves energy, can reduce the emission of oxides containing carbon and sulfur, and does not cause secondary pollution to the environment. The sintering-free ceramsite prepared by the method disclosed by the invention has excellent performance, can be combined with the existing ceramsite preparation process and other processes, and is suitable for preparing ceramsite and ceramic sand with large, medium and small particle sizes.
Description
Technical Field
The invention belongs to the field of solid waste utilization, and particularly relates to a non-fired ceramsite and a preparation method thereof.
Background
Red mud is one of the main solid wastes generated in the process of extracting aluminum by using bauxite. The production of one ton of alumina produces approximately 1-1.5 tons of red mud. In the prior art, alumina is mostly produced by a Bayer process, the Bayer process does not undergo high-temperature calcination, so that the Bayer process red mud has higher alkalinity and more heavy metal content, and the red mud produced in the production process is very low in utilization rate, namely about 3.5%. Therefore, green development and utilization of red mud are urgently needed to reduce the quantity of red mud accumulation, reduce pollution of the red mud accumulation on soil and underground water, and release land for other purposes.
In the gold refining process, a large amount of gold tailings are generated, and with the increasing development of gold ores, the yield of by-product gold tailings is also increased sharply. Harmful substances in the gold tailings can invade into soil to change the pH value of the soil, so that the environment for plant growth is damaged, vegetation is killed, and finally the harmful substances can permeate into underground polluted underground water.
In the patents disclosed so far, the following are some aiming at the utilization of red mud and gold tailings as building materials: (1) the red mud is mixed with building waste or clay or sludge or coal gangue and then sintered into ceramsite at high temperature. (CN 109665813A); (2) the red mud and the gold tailings sand are mixed into the sulphoaluminate cement to be used as aggregate to prepare the outdoor colored brick (CN 113480278A); (3) steel slag and red mud are used as main materials, carbon and silicon dioxide are used as reducing agents, and the main materials, the coal gangue and the carbonized rice hulls are mixed and heated to the temperature of more than 1000 ℃ to prepare ceramsite sand (CN 11850214A). (4) The method is characterized in that fly ash, red mud, iron tailings and carbide slag are used as main materials, and a high-temperature steam curing method is adopted to prepare the baking-free ceramsite (CN 113912376A).
The method for recycling the red mud and the gold tailings utilizes solid wastes from the aspect of firing products, sintering and forming need roasting at the temperature of over 1000 ℃, a large amount of fossil energy is consumed in the process, a large amount of harmful gases containing sulfur and carbon are generated, and serious pollution is caused to air quality and environment.
Disclosure of Invention
Aiming at the problem that red mud and gold tailings powder cannot be recycled in an environment-friendly manner in the prior art, the invention provides a method for recycling red mud and gold tailings powder in an environment-friendly manner.
The method of the invention prepares the red mud and the gold tailings powder into the non-fired ceramsite, and the structure of the ceramsite comprises the following steps: the core and the ceramsite outer wall are wrapped on the outer surface of the core;
the outer wall of the ceramsite is prepared from 10-30 parts of waste mineral aggregate with the pH value being more than 9, 20-50 parts of gold tailings and 30-50 parts of mineral powder;
the waste mineral aggregate with the pH value of more than 9 is one or more of red mud, iron tailing powder, carbide slag and lithium slag.
After the waste ore with the pH value more than 9 is mixed with the raw material, the structure of aluminosilicate in the mineral powder and the gold tailings is destroyed, the bonding energy of Al-O and Si-O is reduced, and Al in the raw material is ensured 2 O 3 And SiO 2 The activity of the polymer is improved, simultaneously, the active glass in the ore powder is corroded to release se:Sub>A large amount of active aluminosilicate due to the existence of alkali, then the active aluminosilicate is polymerized, and finally, the generated geopolymer product is usually composed of amorphous hydrated calcium aluminosilicate (C-A-S-H). The hydrated calcium aluminosilicate is the key for forming the ceramsite and providing the strength in the later period. The chemical composition of the lithium slag is similar to that of the red mud, and the lithium slag contains more than 50 percent of SiO 2 And more than 20% of Al 2 O 3 . Can be used as a substitute of red mud, and the mixing amount is consistent with that of the red mud. The main component of the carbide slag and the steel slag is CaO, and the steel slag and the carbide slag can generate Ca (OH) after two kinds of solid waste meet water 2 The calcium hydroxide can excite the active glass bodies in the mineral powder to generate calcium silicate hydrate, and further strength is generated. The doping amount can be kept consistent with that of the red mud.
Preferably, the material for preparing the outer wall of the ceramsite also comprises 3-8 parts of desulfurized gypsum. The desulfurized gypsum contains sulfate ions which can react with aluminate ions, hydroxide ions, ions and water to generate ettringite, thereby being convenient for providing early strength.
Preferably, the core has a diameter of 0.5 to 30mm;
preferably, the diameter of the ceramsite is 1-31.5 mm;
further preferably, the diameter of the core is 2 to 5mm; the diameter of the ceramsite is 7-15 mm.
Preferably, the core is made of foamed polypropylene particles, waste plastics or waste rubber tires.
Further preferably, the core is a polypropylene foam particle. The polystyrene foam particles are light in weight, small in density and stable in chemical property. Is favorable for transportation, crushing and storage.
Preferably, the red mud is bayer process red mud; the content of alumina in Bayer process red mud is generally about 20 percent, and the higher the content of alumina is, active Al can be provided for reaction 2 O 3 The more the reaction speed is increased, the more reaction hydration products are increased, and the strength of the ceramsite is improved.
Preferably, the SiO of the gold tailings 2 The content of (A) is more than 40%.
Preferably, the mineral powder is mineral powder with an activity index of more than 95%, the mineral powder with an activity index of more than 95% contains more active vitreous body components, the reaction speed is accelerated, reaction hydration products are increased, and the strength of ceramsite is improved.
The invention also provides a preparation method of the baking-free ceramsite, which comprises the following steps:
1) Uniformly mixing the raw materials for preparing the ceramsite outer wall to obtain a mixture, wetting the surface of the core, putting the wetted core into the mixture, mixing to fully wrap the mixture on the surface of the core, and standing until the surface is slightly hard;
2) Taking out the particles with the slightly hard surfaces, putting the particles into the raw materials for preparing the outer wall of the ceramsite again, and adding water while rotating until the outer wall structure of the ceramsite is formed.
Preferably, the standing time in the step 1) is 20 to 30 hours. The former standing is a key step of ceramsite forming, and a hard shell can be formed on the surface of the core through the operation, so that the subsequent ceramsite structure can be continuously formed, and if the standing is not performed or the standing is insufficient, a stable ceramsite structure is difficult to form.
Preferably, the operation of preparing the ceramsite outer wall in the step 2) is carried out in a disc type granulator, and the inclination angle of the granulator is 40-50 degrees, and the rotating speed is 50-70 r/min;
preferably, the total water addition amount in the step 2) is 20-25% of the total mass of the raw materials for preparing the ceramsite outer wall.
Preferably, the particle sizes of the waste mineral aggregate, the gold tailings, the mineral powder and the desulfurized gypsum with the pH value of more than 9 are all smaller than 200 meshes.
Preferably, the step 2) further comprises maintaining the ceramsite and waiting for the strength of the ceramsite.
As a preferable operation mode, a curing method such as natural curing of a coating film, steam curing, pressurized steam curing and the like can be adopted instead, and water curing and standard curing room curing can also be adopted.
The invention also protects the application of the baking-free ceramsite in building materials.
The parts are parts by weight, and the units are standard units such as kg and g.
The invention has the following beneficial effects:
1) The red mud is solid waste in the aluminum production industry, the gold tailings are solid waste in the gold industry, and solid waste in the industries such as waste building insulation boards of polypropylene foam particles and the like.
2) The sintering-free ceramsite prepared by the method disclosed by the invention has excellent performance, can be combined with the existing ceramsite preparation process and other processes, and is suitable for preparing ceramsite and ceramic sand with large, medium and small particle sizes.
3) The ceramsite disclosed by the invention has the advantages of few types of complete additives, simple process and low cost in the preparation process, and is beneficial to large-scale popularization and application.
Drawings
FIG. 1 is a flow chart of the preparation of solid waste non-fired ceramsite according to the invention.
FIG. 2 is a photograph of the preparation of solid waste non-fired ceramsite core according to the present invention
FIG. 3 is a photograph of solid waste non-fired ceramsite prepared according to the present invention;
FIG. 4 is a cross-sectional photograph of the solid waste non-fired ceramsite prepared according to the invention.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
According to a specific embodiment, the ceramsite provided by the invention is prepared by the following method (the flow chart is shown in figure 1):
(1) Putting the red mud and the gold tailing raw materials into a drying oven at 105 ℃ to be dried to constant weight;
(2) Mixing the dried red mud and gold tailings with mineral powder according to a ratio, and then putting the mixture into a ball mill for milling for 30 minutes; the mixed material after ball milling is required to pass through a 200-mesh square-hole sieve.
(3) Crushing the waste heat-insulation plate into balls, screening particles with the diameter of less than 5mm, and continuously crushing the particles with the diameter of more than 5mm;
(4) Wetting the particles screened in the step (3), adding mineral powder and desulfurized gypsum into the raw materials ground in the step (2), mixing and stirring to coat a shell on the surface of the polyphenyl particles, and standing for more than 20 hours as shown in figure 2 until the surface is slightly hard to be used as a core of the ceramsite;
(5) Mixing the hardened kernels obtained in the step (4) and the raw materials ground in the step (2) with the mineral powder and the desulfurized gypsum, and putting the mixture into a disc type (the inclination angle of a granulator is 45 degrees, and the rotating speed is 60 revolutions per minute)
Starting a machine, adding water while rotating, rolling the core layer by layer to form balls under the action of gravity, and adding the rest powdery mixture in batches until the required diameter range is 6-31.5 mm to obtain ceramsite;
(6) And (5) placing the ceramsite obtained in the step (5) indoors for film covering and natural curing, and waiting for the strength of the ceramsite.
As a specific embodiment, the ceramsite is prepared from the following components in parts by weight (the structure is shown in figures 3 and 4):
examples 1 to 4:
TABLE 1
| Numbering | Polystyrene particles | Red mud | Gold tailings | Slag powder | Desulfurized gypsum | Water (W) | Cement |
| 1 | 0.05 | 1 | 4.5 | 4.0 | 0.5 | 5 | 0 |
| 2 | 0.1 | 1.5 | 4 | 4.0 | 0.5 | 5 | 0 |
| 3 | 0.15 | 2 | 3.5 | 4.0 | 0.5 | 5 | 0 |
| 4 | 0.2 | 2.5 | 3 | 4.0 | 0.5 | 5 | 0 |
| 5 | 0.05 | 1 | 4.5 | 4.0 | 0 | 5 | 0 |
Comparative example 1
Most of the traditional ceramsite uses cement, clay and the like as cementing materials, so clay sintered ceramsite is selected as a comparative example, and the formula is as follows (unit: kg):
TABLE 2
| Numbering | Clay | Cement | Mineral powder | Water (W) | Water reducing agent |
| Comparative example 1 | 10 | 0 | 0 | 5 | 0 |
Comparative example 2
The dosage of various raw materials has an important effect on the molding of the ceramsite, and the comparative example detects the relevant performance of the ceramsite after changing the dosage of the raw materials, and the ceramsite comprises the following substances:
TABLE 3
Comparative example 3
The preparation method of the ceramsite has important influence on the molding of the ceramsite, compared with the examples 1-4, the preparation method of the ceramsite is changed in the comparative example, the preparation method of the ceramsite is changed, the polyphenyl granules are not kept still after being coated with a shell in the step (4), the granulation is carried out by adopting the method in the step 5), and the specific operations in the steps (4) and (5) are as follows:
(4) Wetting the particles screened in the step (3), adding mineral powder and desulfurized gypsum into the raw materials ground in the step (2), mixing and stirring to coat a shell on the surface of the polyphenyl particles, and using the shell as a core of the ceramsite;
(5) And (3) mixing the hardened core obtained in the step (4) with the raw material ground in the step (2), mineral powder and desulfurized gypsum, putting the mixture into a disc type (the inclination angle of a granulator is 45 degrees, and the rotating speed is 60 revolutions per minute), starting the machine, rotating while adding water, rolling the core layer by layer to form balls by the raw material under the action of gravity, and adding the rest of powdery mixture in batches until the particle size range of the ceramsite reaches 6-31.5 mm to obtain the ceramsite.
Examples of the experiments
Measuring the bulk density, cylinder pressure intensity and 24-hour water absorption rate of the ceramsite after 28d molding according to GB/T17321.2 Experimental method for lightweight aggregate and lightweight aggregate of the second part of the experimental method;
the detection results are as follows:
table 4 results of performance test of examples and comparative examples
As is clear from the above table, the cylinder compressive strengths of examples 1, 2, 3 and 4 were all 4.5MPa or more, the water absorptions for 24 hours were all 15% or more, and the average bulk density was 900 to 1100kg/m 3 In addition, the performance requirements of the unburned ceramsite in GB/T17321.2 Experimental method for lightweight aggregate and lightweight aggregate of the second part of the experimental method are met.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A baking-free ceramsite is characterized by comprising the following structural components: the ceramic particle comprises a core and a ceramic particle outer wall wrapping the outer surface of the core;
the outer wall of the ceramsite is prepared from 10-30 parts of waste mineral aggregate with the pH value being more than 9, 20-50 parts of gold tailings and 30-50 parts of mineral powder;
the waste mineral aggregate with the pH value of more than 9 is one or more of red mud, iron tailing powder, carbide slag and lithium slag.
2. The baking-free ceramsite of claim 1, wherein the material for preparing the outer wall of the ceramsite further comprises 3-8 parts of desulfurized gypsum.
3. The non-fired ceramsite according to claim 1 or 2 or wherein the diameter of the core is 0.5-30mm; and/or the diameter of the ceramsite is 1-31.5 mm;
preferably, the diameter of the core is 2-5 mm; and/or the diameter of the ceramsite is 7-15 mm.
4. The non-fired ceramsite according to claim 1 or 2, wherein the core is prepared from polystyrene foam particles, waste plastics or waste rubber tires; preferably polypropylene foam particles.
5. The non-fired ceramsite according to any one of claims 1 to 3, wherein the waste mineral aggregate with pH > 9 is red mud, preferably Bayer process red mud;
and/or SiO in the gold tailings 2 The content of (A) is more than 40%;
and/or the mineral powder is mineral powder with an activity index of more than 95%.
6. The method for preparing the baking-free ceramsite as recited in any one of claims 1 to 5, which is characterized by comprising the following steps:
1) Uniformly mixing the raw materials for preparing the ceramsite outer wall to obtain a mixture, wetting the surface of the core, putting the wetted core into the mixture, mixing to fully wrap the mixture on the surface of the core, and standing until the surface is slightly hard;
2) And taking out the particles with the slightly hard surfaces, putting the particles into the raw material for preparing the outer wall of the ceramsite again, and adding water while rotating until the outer wall structure of the ceramsite is formed.
7. The method according to claim 6, wherein the standing time in the step 1) is 20 to 30 hours.
8. The preparation method according to claim 6, wherein the total water addition amount in the step 2) is 20-25% of the total mass of the raw materials for preparing the ceramsite outer wall;
and/or, the operation of preparing the ceramsite outer wall in the step 2) is carried out in a disc type granulator, and the inclination angle of the granulator is 40-50 degrees, and the rotating speed is 50-70 r/min;
and/or, after the step 2) is finished, maintaining the ceramsite, and waiting for the strength on the ceramsite.
9. The preparation method according to claim 7 or 8, wherein the particle sizes of the waste mineral aggregate, the gold tailings, the mineral powder and the desulfurized gypsum with the pH value being more than 9 are all less than 200 meshes.
10. Use of the non-fired ceramsite according to any one of claims 1-5 in building materials.
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| CN114804797A (en) * | 2022-05-11 | 2022-07-29 | 北京金隅红树林环保技术有限责任公司 | Gold tailing non-sintered light ceramsite and preparation method thereof |
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Application publication date: 20221111 |