CN116768638B - Purification and reuse method of flint clay solid waste - Google Patents
Purification and reuse method of flint clay solid waste Download PDFInfo
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- 239000004927 clay Substances 0.000 title claims abstract description 119
- 239000002910 solid waste Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000000746 purification Methods 0.000 title claims description 8
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 239000002253 acid Substances 0.000 claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000000498 ball milling Methods 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000010419 fine particle Substances 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract 2
- 238000005245 sintering Methods 0.000 claims description 12
- 238000004321 preservation Methods 0.000 claims description 8
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 239000011449 brick Substances 0.000 claims description 4
- 235000006408 oxalic acid Nutrition 0.000 claims description 2
- 238000004064 recycling Methods 0.000 abstract description 10
- 238000010304 firing Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000011819 refractory material Substances 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 5
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000000275 quality assurance Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 23
- 239000000126 substance Substances 0.000 description 8
- 239000012071 phase Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000002441 X-ray diffraction Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000012798 spherical particle Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004876 x-ray fluorescence Methods 0.000 description 1
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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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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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
- C04B33/04—Clay; Kaolin
-
- 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
- C04B33/30—Drying methods
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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
- C04B33/32—Burning methods
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—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
- C04B2235/6567—Treatment time
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention belongs to the technical field of aluminum-silicon refractory materials, and relates to a method for treating flint clay solid waste generated in clay refractory material production, in particular to a method for purifying and recycling flint clay solid waste, which comprises the steps of sequentially washing, filtering, mixing and stirring with an acid solution, mixing with water, sequentially ball-milling, filtering and drying to obtain a flint clay material with fine particles, and forming and firing at high temperature to obtain flint clay clinker. The invention not only reduces the impurity content in the flint clay solid waste from 22% to below 2.5%, but also increases the mullite conversion rate in the flint clay to above 60%, thereby greatly increasing the performances of refractoriness, load softening temperature, compressive strength, service life and the like of the clay refractory product and providing high quality assurance on raw materials for the production of high-end clay refractory materials.
Description
Technical Field
The invention belongs to the technical field of aluminum-silicon refractory materials, relates to a method for treating flint clay solid waste generated in clay refractory material production, and particularly relates to a method for purifying and recycling flint clay solid waste.
Background
Flint clay is one of the main raw materials for producing clay products, and has the main chemical components of Al2O3 and SiO2, and also contains impurity components such as Fe2O3, tiO2, na2O, K O, mgO and the like. The purity of flint clay and the conversion rate of mullite phase are important factors limiting the quality of high-end clay refractory products. The purity of the flint clay is improved, namely the content of Al2O3 and SiO2 is improved, the impurity content is reduced, the conversion rate of mullite phase in the flint clay is improved, and the refractoriness, the load softening temperature, the compressive strength and the service life of the clay refractory product are greatly increased.
Rough mining of the flint clay at this stage causes a large amount of clay to be doped in the flint clay raw material, as shown in fig. 1. In the traditional clay brick production, only a screening machine is used for simple screening, so that the flint clay screen blanking produced by the method has fine granularity and high impurity content, and a large amount of clay is doped in the flint clay screen blanking, so that the impurity content is extremely high and exceeds 20%. In order to prepare high-end clay refractory products, most of flint clay in raw materials is often adopted in a clinker form, but because the generated flint clay screen blanking has finer granularity, a flame path is easy to block in the calcining process, so that the flint clay screen blanking cannot be heated and calcined. Meanwhile, due to the fact that the impurity content of the screen discharging is too high, mullite is seriously inhibited, the mullite phase conversion rate of the produced clay brick is low, and the performances of refractoriness, load softening temperature, compressive strength, service life and the like of the product are obviously reduced.
Therefore, flint clay screen blanking is always treated as solid waste, and resource waste is caused. Therefore, the purification and reuse method for the flint clay solid waste is significant for preparing high-end clay refractory products, improving the utilization level of resources, relieving the situation of shortage of resources and promoting green manufacturing reform in the high-temperature industry.
Disclosure of Invention
The present invention addresses the above-described problems by providing a method for purifying and recycling flint clay solid waste.
In order to achieve the aim, the invention adopts the technical proposal that,
The method for purifying and reutilizing the flint clay solid waste material comprises the following steps:
A. Washing solid waste of the flint clay, and filtering the solid waste;
B. Mixing and stirring the flint clay solid waste obtained by filtering with an acid solution;
C. Mixing the pickled flint clay solid waste with water, and then sequentially performing ball milling, filtering and drying to obtain a flint clay material in the form of fine particles;
D. carrying out high-pressure forming on the fine-grained and powdery flint clay material to obtain a blank;
E. And (3) sintering the blank at high temperature to obtain the flint clay clinker.
Preferably, in the step A, a filter screen is selected to filter the solid waste of the flint clay, and the filter screen is 30 meshes.
Preferably, the acid solution is a mixed acid solution of oxalic acid and hydrochloric acid with a concentration ratio of 2:1, and the concentration of the mixed acid solution is 0.7% -1.5%.
Preferably, the stirring in the step B is continuous stirring, and the stirring time is 25-30 min.
Preferably, the ball milling time is 15-18 h, and the granularity of flint clay solid waste after ball milling is 550-650 meshes.
Preferably, the drying temperature is 550-750 ℃, and the drying heat preservation time is 20-30 min.
Preferably, the size of the shaped green body is standard brick size, i.e. length x width = 230mm x 104mm.
Preferably, the sintering temperature is 1500-1550 ℃, and the sintering heat preservation time is 48-72 h.
The invention adopts the high-pressure water gun to wash the flint clay solid waste.
Wherein the purpose of the flushing is to remove the earth doped in the flint clay.
The flint clay solid waste and the mixed acid solution with low concentration are fully mixed in a stone groove through continuous stirring and react, so that the purposes of removing a part of impurities such as Fe2O3, tiO2, na2O, K2O, caO, mgO and the like in the flint clay are achieved, and the purity of the flint clay is further improved.
The concentration of the adopted mixed acid solution is low, and neutral substances can be formed after the mixed acid solution reacts with a part of impurities such as Fe2O3, tiO2, na2O, K2O and the like in the flint clay, so that the mixed acid solution does not influence the environment.
Mixing the acid-washed flint clay solid waste with water in a ball mill.
The ball milling is carried out in a ball mill, so that the particle size reaches about 600 meshes. Among them, the purpose of ball milling is better shaping.
In some embodiments of the invention, the filtering after ball milling is to separate impurities dissolved in water from flint clay, avoiding that the flint clay still exists after drying.
In some specific embodiments of the invention, the drying is performed in a drying kiln. Wherein the purpose of the drying is to remove physical water and a portion of the structured water in the flint clay.
In some embodiments of the present invention, the granular flint clay material is not directly burned, so that the granular flint clay material is molded at high pressure by an oil press.
Preferably, the shaped charge size is standard tile size, i.e. length x width = 230mm x 104mm.
In some specific embodiments of the invention, the firing is performed in a tunnel kiln.
In addition, the purification and recycling process of the flint clay solid waste provided by the invention is simple to operate and suitable for mass production.
The flint clay clinker provided by the invention can be crushed and sieved according to the requirements of customers, and the components of the flint clay and the mullite phase structure are not affected in the crushing process.
Compared with the prior art, the invention has the advantages and positive effects that,
The invention not only reduces the impurity content in the flint clay solid waste from 22% to below 2.5%, but also increases the mullite conversion rate in the flint clay to above 60%, thereby greatly increasing the performances of refractoriness, load softening temperature, compressive strength, service life and the like of the clay refractory product and providing high quality assurance on raw materials for the production of high-end clay refractory materials.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a raw flint clay screen blanking diagram;
FIG. 2 is a scanning electron microscope image of the flint clay clinker of example 1 provided by the present invention;
Fig. 3 is a scanning electron microscope image of comparative example 2 flint clay clinker provided by the present invention.
Detailed Description
In order that the above objects, features and advantages of the application will be more clearly understood, a further description of the application will be rendered by reference to the appended drawings and examples. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein, and therefore the present invention is not limited to the specific embodiments of the disclosure that follow.
The invention provides a method for purifying and recycling flint clay solid waste, which reduces the impurity content in flint clay solid waste from 22% to below 2.5%.
The second object of the invention is to provide a method for improving the mullite conversion rate in flint clay solid waste, which can improve the mullite conversion rate in flint clay to more than 60%.
Example 1
The flint clay solid waste purification and recycling method provided by the embodiment comprises the following steps:
(1) Repeatedly flushing flint clay solid waste by adopting a high-pressure water gun, and separating out flint clay by using a filter screen;
(2) Placing the flint clay obtained in the step (1) in a stone groove, adding a mixed acid solution with the concentration of 1.0%, mixing and continuously stirring for 30min;
(3) Placing the flint clay obtained in the step (2) in a ball mill, injecting water into the ball mill, performing ball milling for 17 hours, and filtering to obtain 600-mesh spherical particles;
(4) Placing the flint clay spherical particles obtained in the step (3) into a drying kiln, and drying at 750 ℃ for 20min to obtain flint clay materials with fine particles;
(5) Placing the fine-grained powdery flint clay material obtained in the step (4) under an oil press for high-pressure forming to obtain a blank with the length of x width=230 mm x 104 mm;
(6) And (3) placing the blank obtained in the step (5) into a tunnel kiln, sintering at a high temperature of 1550 ℃ and preserving heat for 72 hours to obtain the flint clay clinker.
Example 2
The flint clay solid waste purification and reuse method provided in this comparative example is basically the same as that of example 1, except that the concentration of the mixed acid solution in step (2) is 0.7% and the stirring time is 30min.
Example 3
The method for purifying and recycling the flint clay solid waste provided in the comparative example is basically the same as that in the example 1, except that the sintering temperature in the step (6) is 1500 ℃ and the heat preservation time is 72 hours.
Example 4
The method for purifying and recycling the flint clay solid waste provided in the comparative example is basically the same as that in the example 1, except that the sintering temperature in the step (6) is 1550 ℃ and the heat preservation time is 48 hours.
Comparative example 1
The flint clay solid waste purification and reuse method provided in this comparative example is basically the same as that of example 1, except that the concentration of the mixed acid solution in step (2) is set to 2.5% and the stirring time is 30min.
Comparative example 2
The method for purifying and recycling the flint clay solid wastes provided in the comparative example is basically the same as that in the example 1, except that the sintering temperature in the step (6) is 1450 ℃, and the heat preservation time is 72 hours.
Comparative example 3
The method for purifying and recycling the flint clay solid waste provided in the comparative example is basically the same as that in the example 1, except that the sintering temperature in the step (6) is 1550 ℃ and the heat preservation time is 24 hours.
Experimental example 1
The chemical components of the flint clay obtained in example 1, example 2 and comparative example 1 were each examined, and the results are shown in table 1.
Wherein the chemical composition of the flint clay is measured using an X-ray fluorescence spectrometer (XRF).
The mullite conversion of the flint clay clinker obtained in example 1, example 2 and comparative example 1 was examined, and the results are shown in table 1.
Among them, the mullite conversion of flint clay clinker was measured using an X-ray diffraction spectrometer (XRD).
Table 1 comparison of flint clay chemical composition (mass%) and mullite conversion obtained for each group
| Composition of the components | Al2O3 | SiO2 | Fe2O3 | TiO2 | Na2O | K2O | CaO | MgO | Mullite conversion rate |
| Example 1 | 52.42 | 46.22 | 0.51 | 0.49 | 0.01 | 0.15 | 0.18 | 0.02 | 75% |
| Example 2 | 46.96 | 50.65 | 0.95 | 0.75 | 0.08 | 0.21 | 0.33 | 0.07 | 67% |
| Comparative example 1 | 49.66 | 49.98 | 0.12 | 0.16 | 0 | 0.05 | 0.03 | 0 | 53% |
As can be seen from Table 1, examples 1-2 each had a decrease in impurity content from 22% to 2.5% or less in flint clay solid waste in the concentration range of 0.7 to 1.5% mixed acid, wherein the mass percentage of Fe2O3 was decreased to 1.0% or less, the mass percentage of TiO2 was decreased to 0.8% or less, the sum of Na2O, K2O, caO and MgO was decreased to 0.7% or less, and a mullite conversion rate of 60% or more was obtained, whereas comparative example 1 showed that, when the mixed acid concentration exceeded 1.5%, the impurity content in flint clay solid waste was decreased to 0.36%, but the mullite conversion rate was decreased because the impurity was a low melting point phase, the presence of a small amount of liquid phase was conducive to the formation of mullite crystal phase at high temperature, and the fine and more defective mullite crystals were dissolved therein and recrystallized from the liquid phase, thereby promoting the growth of mullite crystal and the development of comparative example 1 was decreased in the liquid phase.
Experimental example 2
The flint clay chemical compositions of example 3 and comparative example 2 are consistent with the results of example 1 in table 1;
The mullite conversion of the flint clay clinker obtained in example 1, example 3 and comparative example 2 was examined, and the results are shown in table 2.
Among them, the mullite conversion of flint clay clinker was measured using an X-ray diffraction spectrometer (XRD).
Table 2 comparison of mullite conversion of flint clinker obtained for each group
| Group of | Example 1 | Example 3 | Comparative example 2 |
| Mullite conversion rate | 75% | 62% | 40% |
As can be seen from Table 2, the flint clay clinker of example 1 and experimental example 3 can obtain a mullite conversion rate of 60% or more in the firing temperature range, whereas the mullite conversion rate of the flint clay clinker drastically decreases when the firing temperature is lowered to 1500 ℃. Meanwhile, by adopting a scanning electron microscope image, the morphology of the flint clay clinker obtained after the high-temperature sintering of the embodiment 1 and the comparative example 2 of the invention is observed, and the results are respectively shown in fig. 2 and 3. As can be seen from fig. 2 and 3, the amount of mullite crystal phase in flint clay clinker is very low when the firing temperature falls below 1500 ℃. This is because too low a firing temperature is detrimental to the formation and growth of flint crystals.
Experimental example 3
The flint clay chemical compositions of example 4 and comparative example 3 are consistent with the results of example 1 in table 1;
The mullite conversion of the flint clay clinker obtained in example 1, example 4 and comparative example 3 was examined, and the results are shown in table 3.
Among them, the mullite conversion of flint clay clinker was measured using an X-ray diffraction spectrometer (XRD).
Table 3 comparison of the mullite conversion of the flint grog obtained for each group
| Group of | Example 1 | Example 3 | Comparative example 2 |
| Mullite conversion rate | 75% | 65% | 48% |
It can be seen from table 3 that the flint clay clinker of example 1 and experimental example 4 can obtain a mullite conversion rate of 60% or more in the firing soak time, whereas it can be seen from comparative example 3 that the mullite conversion rate of the flint clay clinker drastically decreases when the soak time is reduced to 48 hours or less, because the firing soak time is too short to be favorable for formation, development and growth of flint clay crystals.
The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (2)
1. The method for purifying and reutilizing the flint clay solid waste is characterized by comprising the following steps of:
washing solid waste of the flint clay, and filtering the solid waste;
mixing and stirring the flint clay solid waste obtained by filtering with an acid solution;
Mixing the pickled flint clay solid waste with water, and then sequentially performing ball milling, filtering and drying to obtain a flint clay material in the form of fine particles;
carrying out high-pressure forming on the fine-grained and powdery flint clay material to obtain a blank;
sintering the blank at high temperature to obtain flint clay clinker;
in the step A, filtering the flint clay solid waste by using a filter screen, wherein the filter screen is 30 meshes;
the acid solution is a mixed acid solution of oxalic acid and hydrochloric acid with a concentration ratio of 2:1, and the concentration of the mixed acid solution is 0.7% -1.5%;
the stirring in the step B is continuous stirring, and the stirring time is 25-30 min;
The ball milling time is 15-18 h, and the granularity of flint clay solid waste after ball milling is 550-650 meshes;
The drying temperature is 550-750 ℃, and the drying heat preservation time is 20-30 min;
the sintering temperature is 1500-1550 ℃, and the sintering heat preservation time is 48-72 h;
wherein the impurity content in the flint clay solid waste is reduced from 22% to below 2.5%, and the mullite conversion rate in the flint clay clinker is increased to above 60%.
2. A method of purification and reuse of flint clay solid waste according to claim 1, wherein the shaped blank size is standard brick size, length x width = 230mm x 104mm.
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| CN202211739698.XA CN116768638B (en) | 2022-12-30 | 2022-12-30 | Purification and reuse method of flint clay solid waste |
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| CN202211739698.XA CN116768638B (en) | 2022-12-30 | 2022-12-30 | Purification and reuse method of flint clay solid waste |
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| CN116768638B true CN116768638B (en) | 2024-06-07 |
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| CN116768638A (en) | 2023-09-19 |
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