CN114751661A - Hot splashing slag treatment method and application - Google Patents
Hot splashing slag treatment method and application Download PDFInfo
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- CN114751661A CN114751661A CN202210044191.6A CN202210044191A CN114751661A CN 114751661 A CN114751661 A CN 114751661A CN 202210044191 A CN202210044191 A CN 202210044191A CN 114751661 A CN114751661 A CN 114751661A
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- 239000002893 slag Substances 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 43
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000000203 mixture Substances 0.000 claims abstract description 40
- 229910052742 iron Inorganic materials 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000012216 screening Methods 0.000 claims abstract description 24
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 19
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 19
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 19
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 19
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 18
- 230000005291 magnetic effect Effects 0.000 claims abstract description 15
- 238000010276 construction Methods 0.000 claims abstract description 12
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052918 calcium silicate Inorganic materials 0.000 claims abstract description 7
- 239000000378 calcium silicate Substances 0.000 claims abstract description 6
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000009257 reactivity Effects 0.000 claims abstract description 5
- 238000010303 mechanochemical reaction Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 36
- 239000010959 steel Substances 0.000 claims description 36
- 238000007885 magnetic separation Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 5
- 238000003801 milling Methods 0.000 claims description 3
- 230000032683 aging Effects 0.000 abstract description 6
- 239000010410 layer Substances 0.000 abstract description 6
- 239000002344 surface layer Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 description 19
- 235000012241 calcium silicate Nutrition 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 2
- 235000019976 tricalcium silicate Nutrition 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
-
- 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
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
- C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/005—Preliminary treatment of scrap
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The invention discloses a hot splashing slag treatment method, which comprises the step of mixing iron tailings into hot splashing slag to form a mixture, wherein the iron tailings contain Fe2O3And SiO2，Fe2O3Reacting with f-CaO in the hot splashing slag to form a magnetic substance; crushing the mixture by a crushing device to obtain SiO2Through mechanochemical reaction of a crushing device, SiO2Has reactivity of SiO2Reacting with f-CaO in the hot splashing slag to form calcium silicate hydrate; and (3) screening and magnetically separating the crushed mixture, selecting magnetic substances in the screened material, and piling the residual tailings. The inventionAlso discloses application of the tailings obtained by the hot splashing slag treatment method in road construction. The method for treating the hot splashing slag and the application thereof can effectively reduce f-CaO in the hot splashing slag, the tailings can be directly used as a water-stable layer material and a surface layer material for road construction for resource utilization, the problem that the resource utilization can be realized only by aging treatment of the hot splashing slag can be solved, and the force of interdisciplinary innovation is revealed.
Description
Technical Field
The invention relates to the technical field of steel slag treatment, in particular to a hot splashing slag treatment method and application.
Background
The hot slag splashing process belongs to a transitional process in the development stage of the slag treatment process, is a process between a shallow disc process and a cold slag discarding process, and is applied to steel plants such as Tai-Gao steel and the like at the earliest. The background generated by the process is to save pollution caused by floor space discharged by steel slag, recover ferrous metal materials in the steel slag and realize the problem that the steel slag can be deeply processed, developed and utilized, and the process belongs to a slag treatment process which has serious pollution, occupies a large area, has outstanding safety problems and has higher overall processing cost.
For example, in the process of the roller slag process, foreign matters such as a converter mouth and the like are arranged at the upper part in the slag pot, and the bottom slag of the slag pot after the roller slag treatment contains a large amount of metal iron and is not suitable for the roller slag treatment, and the hot slag splashing process is also a selection process under an emergency condition. However, a large amount of steel slag generated by the hot splashing process has potential safety hazard due to high f-CaO in the steel slag, and cannot be directly recycled, so that the steel slag needs aging treatment, the aging treatment time is long, and the timely recycling of the steel slag is greatly influenced.
The steel slag is used as a basic material for road construction for decades, but the problem that f-CaO in the steel slag exceeds the standard needs to be solved by resource utilization of the steel slag in the road construction process. For example, Schlemm published a paper entitled "basic properties of Steel slag and utilization prospects in road engineering" in journal of fly ash, first phase 2006, in which "poor stability of Steel slag products is mostly caused by f-CaO. The steel slag has compact structure and coarse crystallization due to the high temperature process above 1600 ℃, is different from the common calcined lime, has the characteristic of slow hydration, and brings more harm to steel slag products. Therefore, the steel slag needs to be pretreated to reduce the f-CaO content to about 3.0 percent.
In addition, a paper entitled "current situation and prospect analysis of steel slag aggregate road use" is published in journal of wuhan industry academy of academic, 2 nd year of 2012 in renyunshu, liushashun, liu scholar, where "steel slag aggregate is used in road base and road surface concrete, and the paper discloses that the steel slag aggregate has hydraulic activity, good particle shape and mechanical property, not only increases interlocking force among aggregate particles, but also participates in hydration to improve the performance of an interface transition region of slurry and aggregate, thereby integrally improving the bearing capacity of the base material and the wear resistance of the road surface concrete. The volume stability is a key index for large-scale popularization and utilization of the steel slag aggregate, and the evaluation method and mechanism of the steel slag aggregate still need to be further researched. However, the volume expansion of the steel slag is not an incurable symptom through the improvement of the steel slag treatment technology, the aging treatment and the use of the admixture. Therefore, no process technology for directly recycling hot splashing slag in road water stable layer construction exists at present.
Disclosure of Invention
Therefore, it is necessary to provide a hot splashing slag treatment method and application aiming at the problems that the steel slag produced by the existing hot splashing slag process is high in f-CaO and cannot be directly recycled.
A hot splashing slag treatment method comprises the following steps:
mixing iron tailings into hot splashing slag to form a mixture, wherein the iron tailings contain Fe2O3And SiO2， Fe2O3Reacting with f-CaO in the hot splashing slag to form a magnetic substance;
crushing the mixture by a crushing device to obtain SiO2Through mechanochemical reaction treatment of the crushing device, SiO2Having reactivity, SiO2Reacting with f-CaO in the hot splashing slag to form calcium silicate hydrate;
and screening and magnetically separating the crushed mixture, selecting magnetic substances in the screened material, and piling the residual tailings.
In one embodiment, the mass of the mixed iron tailings is 10-15% of the mass of the hot splashing slag.
In one embodiment, the crushing device is a rod mill.
In one embodiment, the step of crushing the mixture by the crushing device specifically comprises:
and inputting the mixture into the rod mill, wherein the rod milling time of the rod mill is controlled to be 15-30 min, and the particle size of the rod mill is controlled to be below 50 mm.
In one embodiment, the mixture after crushing is subjected to magnetic separation through multi-stage screening, and the mixture with the granularity of more than 50mm returns to the rod mill.
In one embodiment, the crushed mixture is subjected to three-stage screening and magnetic separation, wherein 0-5 mm is used as the first-stage screening, 5-25 mm is used as the second-stage screening, and 25-50 mm is used as the third-stage screening.
In one embodiment, the step of selecting the magnetic substances in the sieved materials by sieving and magnetically separating the crushed mixture and the step of piling the remaining tailings specifically comprises the following steps:
and (3) screening the crushed mixture in multiple stages, carrying out magnetic separation on different screened materials, returning the magnetic substances serving as iron and steel materials to an iron and steel plant for resource utilization, and grading and stacking the residual tailings after magnetic separation.
In one embodiment, the hot splashing slag is dug and coarsely broken, and the iron tailings are mixed into the hot splashing slag to form a mixture.
Application of tailings obtained by the hot slag splashing treatment method in road construction.
The hot splashing slag treatment method and the application have at least the following advantages:
utilizing Fe in iron tailings2O3The f-CaO in the magnetized hot splashing slag can be recycled in the steel slag magnetic separation production line, so that the f-CaO in the hot splashing slag is reduced. SiO in iron tailings 2After the crushing device is crushed, the slag breaking device has hydration reaction activity and can react with f-CaO in the steel slag to form hydrated calcium silicate, so that the harm of the f-CaO remained in the steel slag is eliminated, the tailings can be directly used as a water stabilizing layer material and a surface layer material for road construction for resource utilization, the problem that the hot splashing slag aging treatment can be used for resource utilization can be solved, and the force of interdisciplinary innovation is revealed.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings, which are required to be used in the embodiments, will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.
FIG. 1 is a flowchart of a hot slag splashing treatment method according to an embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many different forms other than those herein described and it will be apparent to those skilled in the art that similar modifications may be made without departing from the spirit of the invention and that the invention is not limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, in an embodiment of the method for treating hot slag, f-CaO in the hot slag can be effectively reduced, and tailings can be directly used as a water-stable layer material and a surface layer material for road construction for resource utilization. Specifically, the processing method comprises the following steps:
step S110: mixing iron tailings into hot splashing slag to form a mixture, wherein the iron tailings contain Fe 2O3And SiO2，Fe2O3Reacts with f-CaO in the hot splashing slag to form a magnetic substance.
Specifically, by studying the characteristics of f-CaO in the hot splashing steel slag, it is found that the f-CaO generated by the phase change of tricalcium silicate in the hot splashing slag gradually precipitates from the tricalcium silicate with the passage of time, and is discontinuously distributed on the basis of dicalcium silicate, and the f-CaO formed by lime which is not reacted in slag making is added, and solid solution of Fe and Mn (CaO, FeO, MnO) is dissolved.
The iron tailings contain Fe2O3And a large amount of acidic materials, the components of iron tailings of a certain enterprise are shown in the following table:
| SiO2 | Al2O3 | CaO | Fe2O3 | MgO | MnO | SO3 | TFe |
| 21～72 | 0.5～15 | 0.5～31 | ～26 | 0.5～15 | <0.2 | <4.1 | <38 |
mixing the iron tailings into hot splashing slag to form a mixture, wherein Fe in the iron tailings2O3Can react with f-CaO in the hot splashing slag to form a ferromagnetic substance. In one embodiment, the hot splashing slag is dug and coarsely broken, and then the iron tailings are mixed into the hot splashing slag to form a mixture. Wherein the mass of the mixed iron tailings is 10-15% of the mass of the hot splashing slag.
Step S120: crushing the mixture by a crushing device to obtain SiO2After the mechanical force chemical reaction treatment of the crushing device,SiO2has reactivity of SiO2Reacts with f-CaO in the hot splashing slag to form calcium silicate hydrate.
Specifically, after the iron tailings are subjected to the mineral separation process, the acid substance SiO in the tailings slag 2In the process of crushing processing, the crystal structure has certain reaction activity after the mechanical force chemical reaction treatment of ore dressing. When the mixture is crushed by the crushing device, the acidic substance SiO2Then the acid substance SiO is treated by a mechanochemical reaction in a crushing device2Completely has the reactivity of SiO2And the calcium silicate hydrate is formed by the reaction with the f-CaO in the hot splashing slag, so that the harm of the residual f-CaO in the hot splashing slag is eliminated.
In one embodiment, the crushing device is a rod mill, which crushes the mix into rod mills. When the rod mill crushes the mixture, the mixture is input into the rod mill, the rod milling time of the rod mill is controlled to be 15-30 min, and the particle size of the rod mill is controlled to be below 50 mm. It will be appreciated that in other embodiments the crushing device may be other devices as long as the mix can be crushed by mechanical force.
Step S130: and (3) screening and magnetically separating the crushed mixture, selecting magnetic substances in the screened material, and piling the residual tailings.
Specifically, after the crushed mixture is screened, the mixture with the granularity not meeting the requirement is returned to the crushing device. Screening materials are subjected to magnetic separation to screen out magnetic substances, and the residual tailings after the magnetic separation are stacked. In one embodiment, the crushed mixture is subjected to multi-stage screening and magnetic separation, and the mixture with the granularity of more than 50mm returns to the rod mill of the rod mill.
In a specific embodiment, the crushed mixture is subjected to three-stage screening and magnetic separation, wherein 0-5 mm is used as the first-stage screening, 5-25 mm is used as the second-stage screening, 25-50 mm is used as the third-stage screening, and the magnetic field intensity of the magnetic separation is set according to normal process control. Different screening materials are subjected to magnetic separation, magnetic substances are returned to an iron and steel plant as iron and steel materials for resource utilization, and the magnetic separation residual tailings are piled up in a grading manner.
On the other hand, the invention also provides application of the tailings obtained by the hot splashing slag treatment method in road construction. Specifically, the tailings obtained by the hot slag splashing treatment method can be used as a water-stable layer material and a surface layer material for road construction.
According to the hot splashing slag treatment method and the application, the tailings can be directly used as a water stabilizing layer material and a surface layer material for road construction for resource utilization, the problem that the hot splashing slag can be recycled only after aging treatment can be solved, and the force of interdisciplinary innovation is revealed.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; the modifications or substitutions do not depart from the spirit of the technical solutions of the embodiments of the present invention, and the technical solutions of the embodiments of the present invention are intended to be covered by the claims and the specification.
Claims (9)
1. A hot splashing slag treatment method is characterized by comprising the following steps:
mixing iron tailings into hot splashing slag to form a mixture, wherein the iron tailings contain Fe2O3And SiO2，Fe2O3Reacting with f-CaO in the hot splashing slag to form a magnetic substance;
crushing the mixture by a crushing device to obtain SiO2Through mechanochemical reaction treatment of the crushing device, SiO2Has reactivity of SiO2Reacting with f-CaO in the hot splashing slag to form calcium silicate hydrate;
and screening and magnetically separating the crushed mixture, selecting magnetic substances in the screened material, and piling the residual tailings.
2. The method for treating hot splashing slag according to claim 1, wherein the mass of the mixed iron tailings is 10-15% of the mass of the hot splashing slag.
3. The method of claim 1, wherein the breaking device is a rod mill.
4. The method for treating hot splashing slag according to claim 3, wherein the step of crushing the mixture by a crushing device specifically comprises:
and inputting the mixture into the rod mill, wherein the rod milling time of the rod mill is controlled to be 15-30 min, and the particle size of the rod mill is controlled to be below 50 mm.
5. The method for treating hot splashing slag according to claim 4, wherein the crushed mixture is subjected to multi-stage screening and magnetic separation, and the mixture with the granularity of more than 50mm returns to the rod mill.
6. The hot splashing slag treatment method according to claim 5, wherein the crushed mixture is magnetically separated by three-stage screening, wherein 0-5 mm is used as the first stage screening, 5-25 mm is used as the second stage screening, and 25-50 mm is used as the third stage screening.
7. The method for treating hot splashing slag according to claim 1, wherein the step of screening and magnetically separating the crushed mixture to select magnetic substances in the screened material and the step of piling the residual tailings specifically comprises the following steps:
and (3) screening the crushed mixture in multiple stages, carrying out magnetic separation on different screened materials, returning the magnetic substances as iron and steel materials to an iron and steel plant for resource utilization, and grading and stacking the residual tailings after the magnetic separation.
8. The method for treating hot slag splashing according to claim 1, wherein the hot slag is dug and coarsely broken, and the iron tailings are mixed into the hot slag to form a mixture.
9. Use of tailings obtained by the hot slag splashing treatment method according to any one of claims 1 to 8 in road construction.
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