CN116835997B - Method for preparing ceramsite filter material - Google Patents
Method for preparing ceramsite filter material Download PDFInfo
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- CN116835997B CN116835997B CN202311110366.XA CN202311110366A CN116835997B CN 116835997 B CN116835997 B CN 116835997B CN 202311110366 A CN202311110366 A CN 202311110366A CN 116835997 B CN116835997 B CN 116835997B
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- 239000000463 material Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000919 ceramic Substances 0.000 claims abstract description 26
- 239000002893 slag Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000003245 coal Substances 0.000 claims abstract description 9
- 239000008188 pellet Substances 0.000 claims description 13
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 12
- 239000002351 wastewater Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 8
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 230000032683 aging Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 15
- 239000002910 solid waste Substances 0.000 abstract description 10
- 238000005245 sintering Methods 0.000 abstract description 8
- 239000013078 crystal Substances 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 2
- 239000011707 mineral Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 229910052661 anorthite Inorganic materials 0.000 abstract 1
- GWWPLLOVYSCJIO-UHFFFAOYSA-N dialuminum;calcium;disilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] GWWPLLOVYSCJIO-UHFFFAOYSA-N 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 11
- 229910001719 melilite Inorganic materials 0.000 description 8
- 238000001179 sorption measurement Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 239000010881 fly ash Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010587 phase diagram Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004451 qualitative analysis Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000012764 semi-quantitative analysis Methods 0.000 description 2
- 239000012798 spherical particle Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 241000723420 Celtis Species 0.000 description 1
- -1 Fe 2 O 3 Chemical class 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000002431 foraging effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
- C04B38/0645—Burnable, meltable, sublimable materials
- C04B38/068—Carbonaceous materials, e.g. coal, carbon, graphite, hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/02—Loose filtering material, e.g. loose fibres
- B01D39/06—Inorganic material, e.g. asbestos fibres, glass beads or fibres
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
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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
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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
- C04B33/138—Waste materials; Refuse; Residues from metallurgical processes, e.g. slag, furnace dust, galvanic waste
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- 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
- C04B2235/606—Drying
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- 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
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6562—Heating rate
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- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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Abstract
The invention provides a method for preparing a ceramic particle filter material, which is characterized in that anorthite is used as an expected main crystal phase, the optimal proportion of ingredients is optimized, and the ceramic particle filter material is prepared by roasting. The invention adopts the sintering method to prepare the water treatment ceramsite by taking the baiyunebo tailings and the blast furnace slag as main raw materials and taking the coal gangue as auxiliary raw materials, the material is gray, has high porosity and good chemical stability, can replace the ceramsite prepared from natural minerals, and effectively converts the metallurgical slag solid waste into a new water treatment material with high added value.
Description
Technical Field
The invention belongs to the field of comprehensive utilization of solid waste resources, and particularly relates to a method for preparing a ceramsite filter material by utilizing dressing and smelting solid waste.
Background
In recent years, with the rapid development of economy, the discharge amount of industrial solid waste has been rapidly increased, which results in extremely consumption of precious natural resources and extremely bad influence on the environment and human health. The current smelting technology generally has the slag yield of 300-900kg per ton of pig iron. Wherein SiO is 2 、CaO、Al 2 O 3 The total ratio of the three is more than 90%, and other components such as MnO, feO, K can also appear in the slag 2 O、Na 2 O, sulfides, and the like. Tailings are the fraction of the product obtained during beneficiation that has a low content of useful components and cannot be used for production. The tailings are mainly used for recovering valuable elements, are used as raw materials of building materials, soil improvers and the like, and can be comprehensively utilized because the tailings contain components capable of being used for other purposes.
Blast furnace slag is a solid waste produced in the production process of pig iron in a blast furnace. That is, the blast furnace slag is a byproduct of steel production, and is discharged from the blast furnace during the steel smelting process, mainly composed of SiO 2 、CaO、Al 2 O 3 MgO, and other compounds such as Fe 2 O 3 、TiO 2 And MnO 2 Composition is prepared. The blast furnace slag contains a large amount of valuable elements, but the comprehensive utilization rate is not high.
Gangue is also a common solid waste, and the accumulation of the gangue occupies a large amount of land resources, and sulfide contained in the gangue pollutes the atmosphere and a water source after being dispersed, so that serious consequences are caused.
In conclusion, new technical means are explored, a more effective cleaning method is developed, materials with high added value are produced by comprehensively utilizing the dressing and smelting solid waste, and the method has extremely important effects on energy conservation, emission reduction and environmental protection.
Ceramsite (Ceramsite) is a granular material which can be produced by foaming in a rotary kiln, and is one of ecological environment materials which relatively develop rapidly in China in the years. The ceramsite has the characteristics of small volume, multiple pores, strong adsorption capacity and the like, so that the ceramsite is widely applied to the fields of heat insulation, fire resistance, building materials and the like. The preparation technology of the ceramsite mainly comprises two main types, namely a high-temperature sintering method and a baking-free method. At present, a high-temperature sintering method is mostly adopted and a baking-free method is rarely adopted for the preparation method of the water treatment ceramsite. The artificial lightweight material is prepared by crushing, mixing, pelletizing and sintering industrial waste material, such as flyash, tailings, etc. The ceramic particles are silicate spheres with certain strength and the particle size is usually 7-12 mm, and the ceramic particles are obtained by phase transition of raw materials at a certain temperature to generate a certain amount of liquid phase quantity and release gas. For the ceramic particles used for the wastewater treatment filter material, the surface presents a porous structure, the external pores are connected with the internal pores, and the internal pores are mutually communicated, so that the ceramic particles used for the wastewater treatment filter material have larger specific surface area and porosity, so that the ceramic particles have better adsorption performance, and pollutants in the wastewater are treated through adsorption.
Therefore, the dressing and smelting solid waste is used as a resource of 'misplaced places', can be comprehensively utilized by preparing the environment-friendly high-performance ceramsite material, improves the added value of the ceramsite material, is an effective way for reducing the problem of environmental pollution, and is beneficial to the sustainable development of the metallurgical industry.
Chinese patent CN103159483B discloses an industrial waste residue haydite and a preparation method thereof, wherein industrial waste residue (iron tailings, blast furnace slag and fly ash) is mechanically crushed, sieved by a 300-mesh sieve, and fine powder is taken out; iron tailings are respectively taken according to the mass percentage: 15% -30%, blast furnace slag: 10% -25%, fly ash: 45% -75%; mixing the raw materials, spraying water accounting for 3-8% of the total mass into the mixture through a granulator to prepare spherical particles with the granularity of 5-13 mm, naturally drying in the shade for 1-3 d at normal temperature, and drying the spherical particles for 0.5-1.5 hours through the tail gas of a rotary kiln; and finally, feeding the ceramic particles into a rotary kiln for roasting, wherein the temperature of a roasting zone of the rotary kiln is 1150-1250 ℃, the roasting zone of the rotary kiln is roasted for 15-20 min, and cooling the ceramic particles to normal temperature by a cooler to obtain ceramic particles. The porosity and specific surface area of the ceramsite prepared by the method provided by the invention are still further improved.
Disclosure of Invention
The invention adopts a new sintering method, the idea is that firstly, the temperature is quickly increased, the ceramic is preheated to prevent the green pellets from cracking, the coal gangue in the ceramic is combusted to generate gas so as to generate pores in the ceramic, and then the ceramic is continuously heated to the roasting temperature for roasting and forming, so that the water treatment ceramic with certain strength and porosity is obtained.
The invention provides a method for preparing a ceramic particle filter material by the cooperation of baiyunebo tailings and blast furnace slag, which is characterized in that under the guidance of a traditional sintering method for preparing ceramic particles, the optimal performance proportion and a sintering system for preparing ceramic particles are obtained by taking celtis as a main phase by utilizing the existing equipment, so that each performance of the ceramic particles is further represented.
The method for preparing the ceramsite filter material provided by the invention comprises the following steps:
(1) According to SiO 2 The content of the components is 30% -51.67%, al 2 O 3 The content range of the components is 1.68-14.05%, the content range of the CaO component is 28.04-43.29%, and the proportion of the bayan obo tailings, the blast furnace slag and the coal gangue is calculated;
(2) Crushing and sieving the baiyunebo tailings, the blast furnace slag and the coal gangue, and mixing the materials according to the calculated proportion;
(3) Adding water into the mixture to pelletize, wherein the addition amount of the water is 5-15% of the weight of the mixture, preparing ceramsite green pellets with the average diameter of 7-12 mm, and aging for 12-48h;
(4) Drying the aged ceramsite green pellets at 100-120 ℃ for 1-4 hours;
(5) Preheating the dried ceramsite green pellets;
(6) Heating to the roasting temperature of 1000-1200 ℃ at the speed of 5-10 ℃/min and preserving heat;
(7) And cooling the ceramic green pellets to room temperature along with a furnace to obtain ceramic filter materials.
The compounding may be carried out in a compounder, as is conventional in the art. The ageing treatment may be carried out in trays. The drying process may be carried out in an electrothermal forced air drying oven. The preheating may be performed in a muffle furnace.
The component content range of the present invention has a special technical meaning, specifically, the melilite is taken as the expected main crystal phase, as shown in fig. 1, dotting is performed in the area range of the melilite, and the maximum value of each component content is determined through calculation, so as to obtain the value range of each component content.
Further, in the step (2), a 200-mesh sieve is used, and the sieve is taken down for standby.
Further, the preheating temperature in the step (5) is 400-500 ℃.
Further, the preheating time in the step (5) is 15-23min.
Further, the temperature rising rate in the step (6) is 8-10 ℃/min.
Further, the roasting time in the step (6) is 10-15min.
Further, the step (1) adopts coal gangue as pore-forming agent to prepare ceramsite, which has four advantages: (1) The fixed carbon content of the gangue is 14.07%, and the gangue burns and releases heat during mixed roasting, so that heat is provided, and the energy consumption can be reduced; (2) The fixed carbon of the gangue is combusted to generate gas, which can play a role in pore-forming; (3) The ash content of the gangue is Ca, si, al, mg phase, and the gangue can be effectively fused into a phase system of ceramsite; (4) The gangue is used as industrial solid waste, and the utilization way of the gangue as a pore-forming agent is also expanded.
Further, al in the step (1) 2 O 3 、SiO 2 The calculation of CaO is to use the melilite as a main phase, and the melilite has the characteristics of high hardness and high wear resistance.
Further, in the step (1), al is 10% based on MgO 2 O 3 -SiO 2 The raw material ratio is determined as the baiyunebo tailings according to the component range of the melilite in the CaO ternary phase diagram: blast furnace slag: gangue = 25:65:10, carrying out batching.
Furthermore, the ceramsite filter material is obtained by the method, and the ceramsite is used for treating ammonia nitrogen wastewater.
The invention has the advantages that the sintering method is adopted to prepare the water treatment ceramsite by taking the bayan obo tailings and the blast furnace slag as main raw materials and the coal gangue as auxiliary raw materials, the material is gray, has high porosity and good chemical stability, can replace the ceramsite prepared from natural minerals, and effectively converts the metallurgical slag solid waste into a new water treatment material with high added value.
Drawings
FIG. 1 shows CaO-Al with MgO at 10% 2 O 3 -SiO 2 Is a ternary phase diagram.
FIG. 2 is a TG curve of coal gangue.
Fig. 3 is an XRD pattern of a ceramsite sample at the temperature of 500-1150 ℃ as is, and fig. 3 is a graph of performing XRD qualitative and semi-quantitative analysis on phase transitions of ceramsite finished products at the temperature ranges of 500-1090 ℃ as is by using a rotary target polycrystalline X-ray diffractometer (XRD) to observe the phase transitions in the temperature ranges.
Fig. 4 shows the observation of the microstructure of the ceramsite sample under the optimum firing regime using a zeiss Sigma300 Scanning Electron Microscope (SEM). In FIG. 4, (a) is an SEM image of the ceramsite magnified 500 times before adsorbing the ammonia nitrogen wastewater, and (b) is an SEM image of the ceramsite magnified 5000 times before adsorbing the ammonia nitrogen wastewater.
In fig. 5, (a) shows the effect of the addition amount on the ammonia nitrogen removal rate, (b) shows the effect of the adsorption time on the ammonia nitrogen removal rate, and (c) shows the effect of the pH of the solution on the ammonia nitrogen removal rate.
FIG. 6 is a macroscopic view of a ceramsite according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1:
crushing the baiyunebo tailings, the blast furnace slag and the coal gangue, sieving with a 200 mesh sieve, and referring to Al with 10 percent of MgO 2 O 3 -SiO 2 The composition range of the melilite in the CaO ternary phase diagram is determined by determining SiO as shown in FIG. 1 2 The content of the components is 30% -51.67%, al 2 O 3 The content range of the components is 1.68% -14.05%, the content range of the CaO components is 28.04% -43.29%, and proper component points are calculated and selected by adopting the FactSage thermodynamic software to determine the component proportion. Then accurately weighing according to the mass ratio in table 1, and mixing for 3 hours in a mixer to obtain a mixed raw material.
Pelletizing by adopting a disc pelletizer, taking water as a binder, adding about 10% of water, preparing ceramsite green pellets with the diameter of 7-12 mm, and then placing the ceramsite green pellets in a tray for aging for 24 hours. And (5) placing the aged ceramic green pellets into an electrothermal blowing drying box and drying for 2 hours at 105 ℃.
A small amount of gangue is taken for thermogravimetric analysis, and a thermogravimetric curve is shown in figure 2. The gangue reacts in the temperature range of 438-545 ℃, and the preheating temperature can be set to 400 ℃, 500 ℃ and 600 ℃. And (5) placing the dried ceramsite green pellets into a muffle furnace for preheating. After the preheating stage is completed, the temperature is raised to the roasting temperature at a heating rate of 10 ℃ per minute and is maintained for a period of time. The process of lowering the temperature of the ceramic grains from the furnace to the room temperature is called cooling, and the ceramic grains are cooled along with the furnace.
The porosity was tested and calculated as follows:
(1) And (3) drying the ceramsite sample m to the accuracy of 0.01g.
(2) Placing the sample into a distilled water container, standing for 2h, wherein the sum of the mass of the sample and the mass of the hanging basket in water is m 1 。
(3) The mass of the sample in the air after soaking is m 2 。
(4) Mass m of basket in water 3 。
(5) Mass m of sample in Water 4 = m 1 -m 3 。
Calculation formula of porosity (W):
four-factor three-level orthogonal tests were used to obtain the best firing conditions by performing a very poor analysis, as shown in tables 2 and 3.
As shown above, the optimal roasting condition is that the preheating time is 20min, the preheating temperature is 400 ℃, the roasting time is 15min, and the roasting temperature is 1090 ℃.
Comparative example 1:
respectively taking tailings: blast furnace slag: gangue (weight ratio 25:65:10) and tailings: blast furnace slag: fly ash (weight ratio 25:65:10), according to the following pre-preparation methodThe heat time is 20min, the preheating temperature is 400 ℃, the roasting time is 15min, the roasting temperature is 1090 ℃ to prepare ceramsite, the porosity, the specific surface area and the hydrochloric acid solubility are detected, and the experimental results are shown in table 4.
As shown in fig. 1, the method uses the melilite as the expected main crystal phase, performs qualitative and semi-quantitative analysis on the phase transition of the ceramsite finished product, which is generated in each temperature range of 500-1090 ℃ in the original shape and roasting temperature of the ceramsite finished product, by using a rotary target polycrystalline X-ray diffractometer (XRD), and observes the phase transition in each temperature range, so that the melilite appears when the temperature reaches 800 ℃, and the feasibility of the raw material proportioning method is verified. In fig. 4, the microstructure of the ceramsite sample under the optimal system is characterized by adopting a ZEISS Sigma300 Scanning Electron Microscope (SEM) of the ZEISS company in germany, the surface of the ceramsite is rough, a honeycomb structure is formed, a plurality of holes and channels are formed, the ceramsite has a certain pore structure, the specific surface area is large, the porosity is large, the strength is high, and the ceramsite can resist the scouring and shearing actions of water flow as a water treatment filter material, and has a good removal effect when ammonia nitrogen in wastewater is treated.
The ceramsite disclosed by the embodiment of the invention is utilized for treating ammonia nitrogen wastewater. As shown in fig. 5, the influence on the ammonia nitrogen removal rate is explored by using the adding amount of the ceramsite, the adsorption time and the solution pH value, and the result of the comprehensive simulated wastewater static adsorption experiment shows that the adding amount of the ceramsite is 15g/L under the environment condition of 100ml of simulated wastewater with ammonia nitrogen concentration of 100mg/L and ph=7, the adsorption time is 120min, and the ammonia nitrogen removal rate reaches 54.13%, and the effect is excellent.
Claims (1)
1. The application of the ceramsite filter material in treating ammonia nitrogen wastewater is characterized in that the ceramsite filter material is prepared by a method comprising the following steps:
(1) According to SiO 2 The content of the components is 30.46%, al 2 O 3 The calculated raw material bayan jaw with the component content of 13.30 percent and the CaO component content of 30.65 percentThe weight ratio of the raw materials of the blast furnace slag and the gangue is the baiyunebo tailings: blast furnace slag: gangue = 25:65:10;
(2) Crushing the baiyunebo tailings, the blast furnace slag and the coal gangue, sieving with a 200-mesh sieve, and mixing according to the calculated proportion in the step (1);
(3) Adding water into the mixture to pelletize, wherein the addition amount of the water is 5-15% of the weight of the mixture, preparing ceramsite green pellets with the average diameter of 7-12 mm, and aging for 12-48h;
(4) Drying the aged ceramsite green pellets at 100-120 ℃ for 1-4 hours;
(5) Preheating the dried ceramsite green pellets at 400-500 ℃ for 15-23min;
(6) Heating to a roasting temperature of 1000-1200 ℃ at a speed of 8-10 ℃/min, and preserving heat for 10-15min;
(7) And cooling the ceramic green pellets to room temperature along with a furnace to obtain ceramic filter materials.
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| CN101525219A (en) * | 2009-04-06 | 2009-09-09 | 河北理工大学 | Solid waste porcelain granule in iron ore mine and ore dressing plant and preparation method thereof |
| CN103159483A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Industrial waste residue ceramsite and preparation method thereof |
| DE102020100549A1 (en) * | 2020-01-13 | 2021-07-15 | Dongguan Zongzhi Jiance Ltd | High strength, low density Ceramsit proppant |
| CN114591098A (en) * | 2022-04-19 | 2022-06-07 | 内蒙古科技大学 | Modified cancrinite ceramsite capable of efficiently removing ammonia nitrogen and preparation method thereof |
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| CN101525219A (en) * | 2009-04-06 | 2009-09-09 | 河北理工大学 | Solid waste porcelain granule in iron ore mine and ore dressing plant and preparation method thereof |
| CN103159483A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Industrial waste residue ceramsite and preparation method thereof |
| DE102020100549A1 (en) * | 2020-01-13 | 2021-07-15 | Dongguan Zongzhi Jiance Ltd | High strength, low density Ceramsit proppant |
| CN114591098A (en) * | 2022-04-19 | 2022-06-07 | 内蒙古科技大学 | Modified cancrinite ceramsite capable of efficiently removing ammonia nitrogen and preparation method thereof |
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| 白云鄂博尾矿与高炉渣协同制备陶粒工艺及性能研究;张云昊;《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》;B015-1849 * |
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