CN113996626A - Steel slag processing technology - Google Patents
Steel slag processing technology Download PDFInfo
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- CN113996626A CN113996626A CN202111085299.1A CN202111085299A CN113996626A CN 113996626 A CN113996626 A CN 113996626A CN 202111085299 A CN202111085299 A CN 202111085299A CN 113996626 A CN113996626 A CN 113996626A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 208
- 239000010959 steel Substances 0.000 title claims abstract description 208
- 239000002893 slag Substances 0.000 title claims abstract description 205
- 238000012545 processing Methods 0.000 title claims abstract description 20
- 238000005516 engineering process Methods 0.000 title claims abstract description 18
- 238000007885 magnetic separation Methods 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 40
- 229910052742 iron Inorganic materials 0.000 claims description 19
- 238000007599 discharging Methods 0.000 claims description 11
- 239000006148 magnetic separator Substances 0.000 claims description 9
- 238000009628 steelmaking Methods 0.000 claims description 6
- 239000004568 cement Substances 0.000 abstract description 12
- 238000005245 sintering Methods 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 6
- 238000012216 screening Methods 0.000 abstract description 6
- 239000002910 solid waste Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 12
- 235000019738 Limestone Nutrition 0.000 description 5
- 239000006028 limestone Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000004566 building material Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000013461 design Methods 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
- 239000000428 dust Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- -1 sandstone Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 2
- 235000019976 tricalcium silicate Nutrition 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910001413 alkali metal ion Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- 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
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
- Furnace Details (AREA)
Abstract
The invention relates to a steel slag processing technology, which mainly receives and processes solid steel slag in a converter hot braising workshop and an electric furnace hot braising workshop, wherein the steel slag is subjected to coarse crushing by a crusher, crushing by a rod mill, screening and magnetic separation, and then is classified into various products with different purposes, such as steel slag, magnetic separation powder, tailings and the like. The steel slag is sent to a steel plant to produce steel products with high added value, the magnetic separation powder is sent to a sintering plant as a sintering raw material, and the steel slag tailings are sent to a steel slag powder production line to be subjected to deep processing treatment and used for equivalently replacing cement in various concrete and cement products (the mixing amount is 20-30%). The processing technology can recycle the metallurgical solid wastes with resources efficiently, economically and environmentally.
Description
Technical Field
The invention belongs to the technical field of solid waste treatment in the metallurgical industry, and particularly relates to a steel slag processing technology.
Background
The steel slag is the waste slag generated in the steel-making process, mainly comes from oxides formed by oxidizing elements such as silicon, manganese, phosphorus, iron and the like contained in molten iron and waste steel, impurities carried by metal furnace burden, slag formers such as limestone, fluorite, silica and the like, oxidants, desulfurization products, eroded furnace lining materials and the like. The steel yield is about 15% -20%.
With the rapid development of economic society of China, the steel yield is rapidly increased. According to statistics, the steel slag in China is discharged at a speed of more than 8500 ten thousand t every year, but the utilization rate of the steel slag is about 30 percent. Because the utilization rate of steel slag in China is low, a large amount of steel slag is stacked and left unused, a large amount of cultivated land is occupied, and meanwhile alkali metal ions and heavy metal ions in the steel slag permeate into surface water under the washing of rainwater, so that water resources are polluted, and the health of human bodies is threatened. And the steel slag is pulverized into fine alkaline dust particles in the natural stacking process, and the fine alkaline dust particles are easy to enter the surrounding atmosphere under the action of natural wind, so that the surrounding environment is seriously polluted.
Disclosure of Invention
The invention aims to solve the technical problem of providing a steel slag processing technology aiming at the defects of the background technology, and explores a steel slag synergistic treatment technology by taking reduction, reutilization and recycling as principles, so that the steel slag is classified into various products with different purposes, such as slag steel, magnetic separation powder, tailings and the like, and the steel slag has a resource utilization way. The purpose of recycling metallurgical solid waste resources is achieved.
The invention adopts the following technical scheme for solving the technical problems:
s1, conveying the steel slag in the steel slag storage yard to a ground flat screen with the aperture of 150mm through a dump truck, wherein a storage bin is arranged below the ground flat screen, the steel slag with the diameter of less than 150mm falls into the storage bin, and the steel slag with the diameter of more than 150mm is recycled to the loading yard;
s1a, arranging a primary vibrating feeder below a storage bin, and continuously conveying the steel slag into a rubber belt conveyor through the primary vibrating feeder;
s1b, crushing the steel slag in the loading yard by a hydraulic jaw crusher, and then conveying the steel slag into a belt conveyor.
S2, arranging a suspended electromagnetic self-discharging iron remover in the middle of the belt conveyor, sorting out the slag with the diameter larger than 150mm from the steel slag through the electromagnetic self-discharging iron remover, and dropping the steel slag with the diameter smaller than 150mm into a lower slag steel bin, and feeding the steel slag with the diameter smaller than 150mm into a secondary vibrating feeder;
s2a, arranging an ore drawing gate below the slag steel bin, and periodically opening and conveying the slag steel in the slag steel bin into a steelmaking workshop through a dump truck;
s2b, conveying the steel slag with the diameter smaller than 150mm into a primary rod mill on a secondary vibrating feeder, wherein the primary rod mill is provided with 6 platforms for primary crushing of the steel slag, and the crushed steel slag is discharged from a discharge hole at the periphery of the tail part of the rod mill and conveyed to a primary vibrating screen through a belt conveyor; the primary vibrating screen conveys the screened 0-10mm steel slag to a three-stage vibrating feeder through a belt conveyor, conveys the screened steel slag with the diameter of 10-150mm to a secondary magic bar machine through the belt conveyor, and in the conveying process, selects the steel slag with the diameter of 10-150mm through an electromagnetic self-discharging iron remover, and conveys the steel slag with the diameter of less than 10mm to a slag steel warehouse with the diameter of less than 150mm, so that the steel slag with the diameter of less than 10mm is conveyed to a secondary bar mill.
S3, further crushing the steel slag with the diameter less than 10mm by a secondary rod mill, and conveying the steel slag to a secondary vibrating screen by a rubber belt conveyor; the steel slag is divided into steel slag with the diameter larger than 10mm and steel slag with the diameter smaller than 10mm by the secondary vibrating screen; the steel slag with the diameter smaller than 10mm is conveyed to the three-stage vibrating feeder through the rubber belt conveyor, the steel slag with the diameter larger than 10mm is conveyed to the steel slag tailing warehouse with the diameter larger than 10mm through the rubber belt conveyor, and the steel slag with the diameter smaller than 150mm is conveyed to the steel slag warehouse with the diameter smaller than 150mm through the electromagnetic self-discharging iron remover in the conveying process.
S4, the steel slag is sent into a double-roller magnetic separator by a three-level vibrating feeder, and the screened magnetic separation powder with the size of 0-10mm is sent to a magnetic separation powder warehouse with the size of 0-10mm by the double-roller magnetic separator; and (4) feeding the residual steel slag of the double-roller magnetic separator into a three-stage vibrating screen.
S5, dividing the residual steel slag into steel slag with the diameter of 0-6mm and steel slag with the diameter of 6-10mm by using a three-stage vibrating screen, conveying the steel slag with the diameter of 0-6mm to a tailings warehouse with the diameter of 0-6mm, and conveying the steel slag with the diameter of 6-10mm to a tailings warehouse with the diameter of 6-10 mm.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the steel slag processing technology mainly receives and processes solid steel slag in all converter hot stewing workshops and electric furnace hot stewing workshops, the steel slag is subjected to coarse crushing by a crusher and crushing by a rod mill, and then is classified into various products with different purposes, such as steel slag, magnetic separation powder, tailings and the like after screening and magnetic separation. The steel slag is sent to a steel plant to produce steel products with high added value, the magnetic separation powder is sent to a sintering plant as a sintering raw material, and the steel slag tailings are sent to a steel slag powder production line to be subjected to deep processing treatment and used for equivalently replacing cement in various concrete and cement products (the mixing amount is 20-30%). The processing technology can recycle the metallurgical solid wastes with resources efficiently, economically and environmentally.
2. Fully recovering the metal in the steel slag. The process design fully recovers the high added value metallic iron in the steel slag; the recovered metal is divided into four types, namely large steel slag with the thickness of more than 150mm, slag steel with the thickness of 10-150mm and magnetic separation powder with the thickness of 0-10 mm; it can be returned to steel plants and sintering plants according to different requirements. And the metallic iron in the tailings is controlled within 2 percent, so that the magnetic substances in the steel slag are fully recovered.
3. The tailings resources are fully utilized. The tailings contain tricalcium silicate and dicalcium silicate, and have similar components to cement clinker. The main approach of recycling the steel slag is to use the steel slag as concrete admixture, steel slag cement, building material products and road materials. After the steel slag is subjected to hot stuffiness treatment, the expansion phenomenon caused by f-CaO and f-MgO is eliminated, and the quality of the building is ensured. The hot stuffy slag can be 100% utilized after being processed, can replace limestone for building aggregate, can be used for producing steel slag powder as building material, and can equivalently replace cement; thereby saving the non-renewable resources such as limestone, clay, iron powder, sandstone, coal and the like, and saving the consumption of secondary energy power.
Drawings
Fig. 1 is a schematic overall structure diagram of the present embodiment.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the steel slag processing technology of the embodiment combines the characteristics of steel slag raw materials of a certain steel mill, and adopts the most advanced domestic equipment of rod milling, screening and magnetic separation, so that the metallic iron in the steel slag can be separated and recycled to the maximum extent, and the TFe of the steel slag with the thickness of more than 10mm is more than or equal to 80 percent; the TFe of the magnetic separation powder with 0-10mm is more than or equal to 40 percent. Calculated by processing 330 ten thousand tons of steel slag annually, 21.45 ten thousand tons of steel slag can be recovered annually, and 54.45 ten thousand tons of magnetic separation powder can be recovered annually. The recovery of the metallic iron saves equivalent natural resources and corresponding steelmaking energy consumption.
Type selection of main equipment:
the product scheme is as follows:
the main supporting engineering:
the project mainly comprises the following supporting projects: the system comprises a steel slag raw material warehouse, a raw material feeding warehouse, a No. 1 rod mill workshop, a No. 2 rod mill workshop, a screening and magnetic separation workshop, a tailings warehouse, a steel slag finished product warehouse, a central control room, an office building and the like.
The specific treatment process comprises the following steps:
s1, conveying the steel slag in the steel slag storage yard to a ground flat screen with the aperture of n1=150mm through a dump truck, wherein a storage bin is arranged below the ground flat screen, the steel slag with the diameter smaller than 150mm falls into the storage bin, and the steel slag with the diameter larger than 150mm is recycled to the loading yard;
s1a, arranging a primary vibrating feeder below a storage bin, and continuously conveying the steel slag to a rubber belt conveyor through the primary vibrating feeder;
s1b, crushing the steel slag in the loading yard by a hydraulic jaw crusher, then sending the crushed steel slag into a first-level sorting conveyor, and if the diameter of the steel slag is larger than 400mm, crushing the steel slag by a hydraulic hammer, wherein the steel slag is crushed by the jaw crusher.
S2, arranging a suspended electromagnetic self-discharging iron remover in the middle of the primary sorting conveyor, sorting out the steel slag with the diameter larger than 150mm through the electromagnetic self-discharging iron remover, and feeding the steel slag with the diameter smaller than 150mm into a secondary vibrating feeder;
s2a, arranging an ore drawing gate below the slag steel bin, and periodically opening and conveying the slag steel in the slag steel bin into a steelmaking workshop through a dump truck;
s2b, the secondary vibrating feeder sends the steel slag with the diameter smaller than 150mm into a primary rod mill, the primary rod mill is provided with 6 platforms and is used for primary crushing of the steel slag, and the crushed steel slag is discharged from a discharge hole at the periphery of the tail of the primary rod mill and is conveyed to a primary vibrating screen through a belt conveyor; screening the steel slag into steel slag with the diameter of 0-n2 (n 2=10 mm) and steel slag with the diameter of 10-150mm by using a primary vibrating screen; conveying 0-10mm steel slag to a three-stage vibrating feeder, and conveying steel slag with the diameter of 10-150mm to a two-stage sorting conveyor;
s2c, arranging an electromagnetic self-discharging iron remover on the secondary sorting conveyor, conveying the slag with the diameter less than 10mm into the secondary magic rod machine, and sorting the residual slag with the diameter of 10-150mm into a slag steel warehouse less than 150 mm.
S3, further crushing the steel slag with the diameter less than n2=10mm by a secondary rod mill, and conveying the steel slag to a secondary vibrating screen by a belt conveyor; the steel slag is divided into steel slag with the diameter larger than 10mm and steel slag with the diameter smaller than 10mm by the secondary vibrating screen; the steel slag with the diameter smaller than 10mm is conveyed to the three-stage vibrating feeder through the rubber belt conveyor, the steel slag with the diameter larger than 10mm is conveyed to the steel slag tailing warehouse with the diameter larger than 10mm through the rubber belt conveyor, and the steel slag with the diameter smaller than 150mm is conveyed to the steel slag warehouse with the diameter smaller than 150mm through the electromagnetic self-discharging iron remover in the conveying process.
S4, the steel slag is sent into a double-roller magnetic separator by a three-level vibrating feeder, and the screened magnetic separation powder with the size of 0-10mm is sent to a magnetic separation powder warehouse with the size of 0-10mm by the double-roller magnetic separator; and (4) feeding the residual steel slag of the double-roller magnetic separator into a three-stage vibrating screen.
S5, dividing the residual steel slag into steel slag with the diameter of 0-6mm and steel slag with the diameter of 6-10mm by using a three-stage vibrating screen, conveying the steel slag with the diameter of 0-6mm to a tailings warehouse with the diameter of 0-6mm, and conveying the steel slag with the diameter of 6-10mm to a tailings warehouse with the diameter of 6-10 mm.
The steel slag processing technology mainly receives and processes solid steel slag in all converter hot stewing workshops and electric furnace hot stewing workshops, the steel slag is subjected to coarse crushing by a crusher and crushing by a rod mill, and then is classified into various products with different purposes, such as steel slag, magnetic separation powder, tailings and the like after screening and magnetic separation. The steel slag is sent to a steel plant to produce steel products with high added value, the magnetic separation powder is sent to a sintering plant as a sintering raw material, and the steel slag tailings are sent to a steel slag powder production line to be subjected to deep processing treatment and used for equivalently replacing cement in various concrete and cement products (the mixing amount is 20-30%). The processing technology can recycle the metallurgical solid wastes with resources efficiently, economically and environmentally. In addition, the key characteristics are as follows:
1. fully recovering metals in the steel slag:
the process design fully recovers the high added value metallic iron in the steel slag; the recovered metal is divided into four types, namely large steel slag with the thickness of more than 150mm, slag steel with the thickness of 10-150mm and magnetic separation powder with the thickness of 0-10 mm; it can be returned to steel plants and sintering plants according to different requirements. And the metallic iron in the tailings is controlled within 2 percent, so that the magnetic substances in the steel slag are fully recovered.
2. The tailings resources are fully utilized:
the tailings contain tricalcium silicate and dicalcium silicate, and have similar components to cement clinker. The main approach of recycling the steel slag is to use the steel slag as concrete admixture, steel slag cement, building material products and road materials. After the steel slag is subjected to hot stuffiness treatment, the expansion phenomenon caused by f-CaO and f-MgO is eliminated, and the quality of the building is ensured. The hot stuffy slag can be 100% utilized after being processed, can replace limestone for building aggregate, can be used for producing steel slag powder as building material, and can equivalently replace cement; thereby saving the non-renewable resources such as limestone, clay, iron powder, sandstone, coal and the like, and saving the consumption of secondary energy power.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including 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. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention. While the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (5)
1. A steel slag processing technology is characterized in that: the method comprises the following steps:
s1, conveying the steel slag in the steel slag storage yard to a ground level screen with the aperture of n1, wherein a storage bin is arranged below the ground level screen, the steel slag with the diameter smaller than n1 falls into the storage bin, and the steel slag with the diameter larger than n1 is recycled to the loading machine storage yard;
s1a, arranging a primary vibrating feeder below a storage bin, and continuously conveying the steel slag to a primary sorting conveyor through the primary vibrating feeder;
s1b, crushing the steel slag in the loading yard, and sending the crushed steel slag into a first-level sorting conveyor;
s2, arranging an electromagnetic self-discharging iron remover in the middle of the primary sorting conveyor, sorting out the steel slag with the diameter larger than n1 and placing the steel slag into a lower steel slag bin, and sending the steel slag with the diameter smaller than n1 into a secondary vibrating feeder;
s2a, conveying the slag steel in the slag steel bin into a steel-making workshop;
s2b, the steel slag with the diameter less than n1 is sent to a primary rod mill to be crushed by a secondary vibrating feeder, and the crushed steel slag is conveyed to a primary vibrating screen; the primary vibrating screen screens the steel slag into the steel slag with the diameter of 0-n2 and the steel slag with the diameter of n2-n1, wherein n1 is more than n 2; conveying 0-n2 steel slag to a three-stage vibrating feeder, and conveying the steel slag with the diameter between n2-n1 to a two-stage sorting conveyor;
s2c, arranging an electromagnetic self-discharging iron remover on the secondary sorting conveyor, conveying the slag smaller than n2 into the secondary magic rod machine, and sorting the residual slag with the diameter of n2-n1 into a slag steel warehouse smaller than n 1;
s3, further crushing the steel slag with the diameter less than n2 by a secondary rod mill, and conveying the steel slag to a secondary vibrating screen by a rubber belt conveyor; the steel slag is divided into steel slag with the diameter larger than n2 and steel slag with the diameter smaller than n2 by the secondary vibrating screen;
conveying the steel slag with the diameter less than n2 to a three-stage vibrating feeder through a rubber belt conveyor, conveying the steel slag with the diameter more than n2 to a steel slag tailing warehouse of more than n2 through the rubber belt conveyor, and conveying the steel slag with the diameter less than n1 to a steel slag warehouse of less than n1 by using an electromagnetic self-discharging iron remover in the conveying process;
s4, the three-level vibrating feeder sends the steel slag into a double-roller magnetic separator, and the double-roller magnetic separator conveys the screened 0-n2 magnetic separation powder to a 0-n2 magnetic separation powder warehouse; feeding the residual steel slag of the double-roller magnetic separator into a three-stage vibrating screen;
s5, dividing the residual steel slag into steel slag with the diameter of 0-n3 and steel slag with the diameter of n3-n2 by a three-level vibrating screen, conveying the steel slag with the diameter of 0-n3 to a 0-n3 tailings warehouse, conveying the steel slag with the diameter of n3-n2 to an n3-n2 tailings warehouse, and conveying the steel slag with the diameter of n2-n 3.
2. The steel slag processing technology of claim 1, which is characterized in that: where n1=150mm, n2=10mm, n3=6 mm.
3. The steel slag processing technology of claim 1, which is characterized in that: and S2a, arranging an ore drawing gate below the slag steel bin, and periodically opening and conveying the slag steel in the slag steel bin to a steelmaking workshop through a dump truck.
4. The steel slag processing technology of claim 1, which is characterized in that: in S2b, 6 primary rod mills are arranged for primary crushing of steel slag, and the crushed steel slag is discharged from discharge holes on the periphery of the tail of the primary rod mill and conveyed to a primary vibrating screen through a belt conveyor.
5. The steel slag processing technology of claim 2, which is characterized in that: in S1b, the steel slag with the diameter larger than 150mm is crushed by a type crusher, and the steel slag with the diameter larger than 400mm is crushed by a hydraulic hammer.
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