CN113083492A - Steelmaking solid waste integrated treatment system - Google Patents
Steelmaking solid waste integrated treatment system Download PDFInfo
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- CN113083492A CN113083492A CN202110345314.5A CN202110345314A CN113083492A CN 113083492 A CN113083492 A CN 113083492A CN 202110345314 A CN202110345314 A CN 202110345314A CN 113083492 A CN113083492 A CN 113083492A
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- tailings
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- 238000009628 steelmaking Methods 0.000 title claims abstract description 40
- 239000002910 solid waste Substances 0.000 title claims abstract description 20
- 239000004576 sand Substances 0.000 claims abstract description 65
- 239000011449 brick Substances 0.000 claims abstract description 56
- 239000000463 material Substances 0.000 claims abstract description 48
- 239000002002 slurry Substances 0.000 claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 19
- 235000012970 cakes Nutrition 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 16
- 239000002699 waste material Substances 0.000 claims abstract description 15
- 238000000498 ball milling Methods 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000004062 sedimentation Methods 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 4
- 238000007885 magnetic separation Methods 0.000 claims abstract description 4
- 239000011707 mineral Substances 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 101700011696 sand Proteins 0.000 claims description 60
- 238000005187 foaming Methods 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000004519 manufacturing process Methods 0.000 claims description 22
- 239000004568 cement Substances 0.000 claims description 15
- 239000002893 slag Substances 0.000 claims description 13
- 239000006148 magnetic separator Substances 0.000 claims description 12
- 239000004744 fabric Substances 0.000 claims description 8
- 239000004615 ingredient Substances 0.000 claims description 7
- 239000003638 reducing agent Substances 0.000 claims description 7
- 238000009270 solid waste treatment Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 229910000805 Pig iron Inorganic materials 0.000 claims description 5
- 241001584775 Tunga penetrans Species 0.000 claims description 5
- 229910001385 heavy metal Inorganic materials 0.000 claims description 5
- 229910000499 pig iron Inorganic materials 0.000 claims description 5
- 239000000049 pigment Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 4
- 239000002562 thickening agent Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 2
- 239000004574 high-performance concrete Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000002585 base Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000003009 desulfurizing Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011381 foam concrete Substances 0.000 description 1
- 150000007974 melamines Chemical class 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-M naphthalene-1-sulfonate Chemical compound C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-M 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011465 paving brick Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
- B03B9/061—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- 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
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B2101/00—Type of solid waste
- B09B2101/02—Gases or liquids enclosed in discarded articles, e.g. aerosol cans or cooling systems of refrigerators
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2200/00—Recycling of non-gaseous waste material
-
- 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
-
- 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
-
- 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
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
Abstract
The invention relates to an integrated treatment process of steelmaking solid wastes, which comprises the following steps: crushing the steelmaking wastes into materials with the granularity less than 16 mm; screening the materials through a screen of 15-30 meshes after wet ball milling to obtain ore pulp and coarse mineral materials, performing magnetic separation treatment on the ore pulp to obtain iron ore powder and silt slurry, performing centrifugal sedimentation on the silt slurry to obtain tailings and slurry, performing dry discharge on the tailings to obtain extra-fine sand, and performing concentration and filter pressing on the slurry to obtain a mud cake; and performing magnetic rolling treatment on the coarse ore materials left after screening to obtain particle steel and tailings, performing 10mm screen treatment on the tailings to obtain tailings and tailings sand, and performing jigging treatment on the tailings sand to obtain particle steel and coarse tailings sand. The invention respectively converts the wastes of steel making into recyclable resources such as particle steel, iron ore powder and the like after treatment, and the slurry, coarse tailings, extra fine sand and the like generated in the treatment process can be directly used as the preparation raw materials of the pavement brick or the foamed brick.
Description
Technical Field
The invention belongs to the field of comprehensive utilization of solid waste resources, and particularly relates to a treatment system for steelmaking solid waste.
Background
The pig iron is put into a steel-making furnace to be smelted according to a certain process, and the steel is obtained. The steel products include steel ingots, continuous casting slabs, and various directly cast steel castings. The steel-making process comprises the steps of feeding, slagging, deslagging, molten pool stirring, dephosphorization, electric furnace bottom blowing, melting period, oxidation period, refining period, reduction period, external refining, ladle wire feeding, ladle treatment, ladle refining, gas treatment, pre-alloying, component start-up, silicon increase, end point control, steel tapping and the like, and a large amount of solid wastes such as steel-making electric furnace slag, intermediate frequency electric furnace slag, pig iron tailing, desulfurization slag and the like can be generated in the steps.
If the solid waste is directly discarded, the environment is greatly polluted, and the waste contains rich resources such as iron ore and the like, which causes waste of resources, so that how to treat the waste through a proper treatment process and recycle the waste is a key point of research of steel-making enterprises.
Disclosure of Invention
Based on the above, the invention aims to provide a steelmaking solid waste integrated treatment system, which respectively converts steelmaking wastes into recyclable resources such as particle steel, iron ore powder and the like after treatment, and slurry, coarse tailings, extra fine sand and the like generated in the treatment process can be directly used as preparation raw materials of bricks or foamed bricks, so that the solid waste treatment cost is reduced, and meanwhile, the enterprise is created with income.
The technical purpose is realized by the following technical scheme:
the invention provides a steelmaking solid waste integrated treatment process, which comprises the following steps: crushing the steelmaking wastes into materials with the granularity less than 16 mm; screening the materials through a screen of 15-30 meshes after wet ball milling to obtain ore pulp and coarse mineral materials, performing magnetic separation treatment on the ore pulp to obtain iron ore powder and silt slurry, performing centrifugal sedimentation on the silt slurry to obtain tailings and slurry, performing dry discharge on the tailings to obtain extra-fine sand, and performing concentration and filter pressing on the slurry to obtain a mud cake; and performing magnetic rolling treatment on the coarse ore materials left after screening to obtain particle steel and tailings, performing 10mm screen treatment on the tailings to obtain tailings and tailings sand, and performing jigging treatment on the tailings sand to obtain particle steel and coarse tailings sand.
As an implementation mode of the invention, the process also comprises a pavement brick manufacturing process and a foaming brick manufacturing process, wherein raw materials used in the pavement brick manufacturing process comprise coarse tailings obtained after tailing sand treatment and ultrafine sand obtained after dewatering screen treatment, and raw materials used in the foaming brick manufacturing process comprise mud cakes obtained after filter pressing treatment and ultrafine sand obtained after dewatering screen treatment.
As one embodiment of the invention, the paving brick manufacturing process comprises the following steps: treating coarse tailings again by using a 10mm screen, removing tailings, adding 390-450 parts of the treated coarse tailings, 200-260 parts of extra-fine sand and 130-160 parts of cement into a stirrer, stirring and uniformly mixing to obtain a pavior brick matrix, manufacturing and molding the pavior brick matrix and a fabric in a brick making machine according to a mass ratio of (8-12) to 1, and naturally curing for 3-7 days by spraying water, wherein the fabric comprises cement, medium sand and pigment; the manufacturing process of the foaming brick comprises the following steps: ball-milling the filter-pressed mud cake by a ball mill, detecting the water content, adding superfine sand according to the proportion of (1-0.5) of a dry material 1, adding water to obtain slurry with the water content of 30-40%, detecting the water content of the slurry, adding cement, foaming ingredients and a water reducing agent into the slurry, uniformly stirring, controlling the water-material ratio to be below 0.43, injecting into a mold, standing and foaming for 30-75 min to obtain a blank, cutting and packaging the blank, and maintaining for more than 14 days to obtain the high-performance concrete.
As an implementation mode of the invention, in the process for manufacturing the pavement brick, the mass ratio of cement, medium sand and pigment in the fabric is 1:1: 0.3;
as an implementation mode of the invention, the granularity of the mud cake after ball milling in the manufacturing process of the foaming brick is less than 0.3 mm;
as an embodiment of the invention, the mass ratio of cement, water reducing agent and foaming ingredients in the preparation process of the foaming brick is (500-600): 1.5-2.5): 1.
As an embodiment of the invention, the content of the more than 80-mesh fraction in the coarse mineral aggregate obtained after ball milling is below 30%;
in one embodiment of the present invention, the magnetic induction intensity during the magnetic rolling process is 200-600 mT;
in one embodiment of the present invention, the overflow particle size during centrifugal sedimentation is controlled to be less than 0.01mm, and the fraction content is controlled to be 80% or more.
As an embodiment of the invention, the mesh opening of the dewatering screen is 0.3mm when the tailings are drained in a dry mode.
As an implementation mode of the invention, the silt slurry is further subjected to sand washing treatment before centrifugal sedimentation, coarse-grained materials obtained after sand washing are directly subjected to tailing dry discharge to obtain extra-fine sand, heavy metals and silt slurry are obtained after overflow materials are subjected to shaking table treatment, the heavy metals enter an ore pond, and the silt slurry is subjected to centrifugal sedimentation;
as an embodiment of the invention, the content of the coarse material with the granularity of more than 0.2mm is controlled to be more than 90 percent, and the content of the overflow material with the granularity of less than 0.2mm is controlled to be less than 90 percent.
As an embodiment of the invention, the steelmaking waste is one or more of steelmaking electric furnace slag, intermediate frequency furnace steel slag, bar grinding material, pig iron tailing and desulphurization slag.
The invention also provides a steelmaking solid waste integrated treatment device, which comprises a crusher and a ball mill which are sequentially connected, wherein a discharge port of the ball mill is connected with the rotary screen, a discharge port at the bottom of the rotary screen is connected with the magnetic separator, a concentrate outlet of the magnetic separator obtains iron ore powder, a tailing outlet of the magnetic separator is connected with a cyclone, an outlet at the bottom of the cyclone is connected with a dewatering screen, superfine sand is obtained after the dewatering screen is treated, and an overflow port of the cyclone is connected with a filter press through a thickener; the discharge port of the tail part of the rotary screen is connected with the magnetic roller, the tailing outlet of the magnetic roller is connected with the screen, and the discharge port at the bottom of the screen is connected with the jigger.
As an implementation mode of the invention, a tailing outlet of the magnetic separator is connected through a spiral sand washer, a sand outlet of the spiral sand washer is connected with a dewatering screen, a flow port of the spiral sand washer is connected with a shaking table, and a water outlet of the shaking table is connected with a cyclone.
In one embodiment of the invention, four crushers are arranged in series, wherein the four crushers are 400 × 600mm, 250 × 1000mm, 150 × 400mm and 150 × 400mm in sequence, and the discharge port of each crusher is connected with the ball mill bin through a 16 × 16mm vibrating screen.
The integrated treatment system for steelmaking solid wastes provided by the invention can respectively convert steelmaking wastes into recyclable resources such as particle steel, iron ore powder and the like after treatment, and slurry, coarse tailings, extra fine sand and the like generated in the treatment process can be directly used as preparation raw materials of pavement bricks or foamed bricks, so that the solid waste treatment cost of steelmaking enterprises is reduced, and the enterprise can be created. For a steelmaking enterprise producing 250 ten thousand tons of steel per year, the system can add about 2000 ten thousand yuan to the enterprise each year.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with specific embodiments, the examples given are intended to illustrate the invention and are not intended to limit the scope of the invention. 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.
Example 1
The embodiment provides a steelmaking solid waste integrated processing system, which specifically operates as follows: adding steel-making waste, namely electric steel-making slag, intermediate frequency furnace steel slag, bar grinding materials, pig iron tailing, desulfurized slag and the like which enter a field into a 400 x 600mm crusher through a vibrating feeder to perform primary crushing (the waste with the granularity smaller than 16mm can also directly enter a ball mill bin without crushing), then sequentially performing secondary crushing through a 250 x 1000mm crusher, performing tertiary crushing and quartic crushing through a 150 x 400mm crusher, connecting a discharge port of each crusher with a 16 x 16mm vibrating screen, feeding fine materials screened by the vibrating screen into the ball mill through a ball mill bin and a chain plate machine to perform wet ball milling treatment, feeding the materials subjected to ball milling into a 24-mesh rotary screen through the discharge port of the ball mill to perform screening to obtain ore pulp and coarse ore materials, and controlling the granularity of the coarse ore materials to be more than 80 meshes and the content of the grain fraction to be below 30%.
The ore pulp enters a magnetic separator from a discharge hole at the bottom of the drum sieve, wherein the magnetic separator used in the embodiment is a permanent magnet drum magnetic separator, a semi-countercurrent bottom box and magnetic induction intensity of 200-600 mT, and iron ore powder (recyclable resource) and silt slurry are obtained after magnetic separation treatment. The silt slurry is discharged from a tailing outlet of a magnetic separator and then enters a cyclone, the overflow granularity of the cyclone is controlled to be less than 0.01mm, the content of the size fraction is more than 80%, tailings and slurry are obtained after the treatment of the cyclone, the tailings are discharged from an outlet at the bottom of the cyclone and then enter a dewatering screen through a sand pump for dry discharge treatment of the tailings, the aperture of a screen mesh of the dewatering screen is 0.3mm, superfine sand (raw materials of pavior bricks and foaming bricks) is obtained after the treatment of the dewatering screen, a mud cake (raw material of the foaming bricks) is obtained after the treatment of the slurry from an overflow port of the cyclone through a thickener and a filter press, and the silt slurry after the treatment of the dewatering screen can also directly enter the thickener for treatment.
The coarse ore materials after being sieved by the drum sieve are subjected to magnetic rolling treatment by a magnetic roller to obtain particle steel (recyclable resources) and tailings, wherein the tailings are discharged from a tailing outlet of the magnetic roller and enter a 10mm screen, the tailings are sieved by the screen to obtain tailings (recyclable resources) and tailings sand, the tailings sand is discharged from a discharge port at the bottom of the screen and enters a jigger to be subjected to jigging treatment, the jigger used in the embodiment is a sawtooth wave jigger, and the particle steel (recyclable resources) and the coarse tailings (pavement brick raw materials) are obtained after the jigging treatment.
In this embodiment, the silt slurry is further subjected to sand washing treatment and shaking table treatment by a spiral sand washer before entering the cyclone, the spiral sand washer is used for treatment to obtain coarse material and overflow material, wherein the content of the coarse material is controlled to be more than 90% when the size of the coarse material is more than 0.2mm, the content of the overflow material is controlled to be less than 90% when the size of the overflow material is less than 0.2mm, the coarse material enters the dewatering screen for dry discharge treatment of tailings, the overflow material enters the shaking table through a flow port of the spiral sand washer, heavy metals screened on the shaking table after the shaking table treatment enter the ore pond, and a water outlet during the shaking table treatment is connected with the cyclone for centrifugal sedimentation.
According to the method, a large amount of waste materials generated in the steelmaking process can be recycled, and the iron ore powder obtained through recycling can be used as a raw material of the steel industry; the superfine sand can be directly used for preparing pavement bricks and foamed bricks; the particle steel can be used for circuit steel casting and billet smelting, is easy to melt, saves electric power and has the cost lower than that of scrap steel by 300-300 yuan; the coarse tailings can be used for preparing the pavement bricks; the tailing stone can be used for producing building materials; the mud cake can be directly used for preparing the foaming brick.
Example 2
The coarse tailings obtained after the tailings sand treatment in the embodiment 1 and the extra-fine sand obtained after the dewatering screen treatment are directly used for manufacturing the pavior brick, and the specific manufacturing process is as follows: and (2) treating the coarse tailings obtained in the example 1 again by using a 10mm screen, removing tailings, adding 420 parts of the treated coarse tailings, 230 parts of extra-fine sand and 160 parts of cement into a stirrer, uniformly stirring to obtain a pavior brick base material, molding the pavior brick base material and the fabric in a brick making machine according to the mass ratio of 10:1, and naturally curing for 5 days by spraying water, wherein the mass ratio of the cement, the medium sand and the pigment in the fabric is 1:1: 0.3.
The mud cake after the pressure filtration treatment and the extra-fine sand after the dewatering screen treatment in the example 1 are directly used for manufacturing the foaming brick, and the specific manufacturing process is as follows: ball-milling the filter-pressed mud cake by a ball mill, detecting the water content, adding superfine sand according to the proportion of 1:0.8 of dry materials into the mud cake after ball milling by the ball mill for producing the mud cake with the granularity of less than 0.3mm, adding water to obtain slurry with the water content of 30-40%, detecting the water content of the slurry, adding cement, a water reducing agent and a foaming ingredient with the mass ratio of 500:2:1.5 into the slurry, uniformly stirring, controlling the water-material ratio to be less than 0.43, injecting into a mould, standing and foaming for 60min to obtain a blank body, cutting and packaging the blank body, and maintaining for more than 14 days to obtain the product, wherein the water reducing agent can be selected from lignosulfonate or naphthalene sulfonate or sulfonated melamine resin, and the foaming ingredient can be selected from aluminum paste alkali with the molar ratio of 1: 1.
The pavement bricks and the foamed bricks prepared in the example 2 are tested for the compressive strength, the dry bulk density and the like, and the test results are shown in the following tables 1 and 2:
TABLE 1 results of Cc50 pavior brick performance tests prepared in example 2
Table 2 results of performance test of the foamed bricks obtained in example 2
As can be seen from tables 1 and 2, the extra-fine sand, the coarse tailings, the slurry and the like obtained by the method provided by the invention are directly used for preparing the pavior brick or the foamed brick, and the performance index of the prepared pavior brick can reach the C index in GB/T28635-c50, the performance index of the prepared foaming brick can meet the requirement of A2.5B07 in JC/T1062-2007 foam concrete block, and the foaming brick is widely applied to the market.
The applicant adjusts the proportion of the raw materials, and finds that when the using amount of coarse tailings is 390-450 parts, the using amount of extra-fine sand is 200-260 parts, the using amount of cement is 130-160 parts, and the mass ratio of the base material to the fabric of the pavement brick is (8-12): 1, the prepared pavement brick can meet the requirements;
when the granularity of the ball-milled mud cake is less than 0.3mm, extra-fine sand is added to ensure that the dry material ratio is 1 (1-0.5), the mass ratio of mud ash (the mixture of the mud cake and the extra-fine sand), cement, a water reducing agent and foaming ingredients is (750-850): (500-600): 1.5-2.5): 1-1.6), and the water-material ratio is below 0.43, so that the prepared foamed brick can meet the requirements.
The steelmaking solid waste treatment system is adopted to treat steelmaking solid waste, about 50 ten thousand tons of steel slag are generated in a steel plant with the annual output of 250 ten thousand tons of steel, 5000 tons of iron ore powder, 10 ten thousand tons of superfine sand, 5000 tons of particle steel, 15 ten thousand tons of coarse tailings and 24 ten thousand tons of mud cakes can be recovered and obtained through solid waste treatment, the requirements for producing 30 ten thousand square road bricks and 70 ten thousand square foamed bricks can be met, and the additional value can be increased by 2000 ten thousand yuan for enterprises.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The integrated treatment process for steelmaking solid wastes is characterized by comprising the following steps of:
crushing the steelmaking wastes into materials with the granularity less than 16 mm;
screening the materials through a screen of 15-30 meshes after wet ball milling to obtain ore pulp and coarse mineral materials, performing magnetic separation treatment on the ore pulp to obtain iron ore powder and silt slurry, performing centrifugal sedimentation on the silt slurry to obtain tailings and slurry, performing dry discharge on the tailings to obtain extra-fine sand, and performing concentration and filter pressing on the slurry to obtain a mud cake; and performing magnetic rolling treatment on the coarse ore materials left after screening to obtain particle steel and tailings, performing 10mm screen treatment on the tailings to obtain tailings and tailings sand, and performing jigging treatment on the tailings sand to obtain particle steel and coarse tailings sand.
2. The integrated steelmaking solid waste treatment process as claimed in claim 1, further comprising a pavior brick manufacturing process and a foaming brick manufacturing process, wherein raw materials used in the pavior brick manufacturing process comprise coarse tailings obtained after tailing sand treatment and ultrafine sand obtained after dewatering screen treatment, and raw materials used in the foaming brick manufacturing process comprise filter-pressed mud cakes and ultrafine sand obtained after dewatering screen treatment.
3. The steelmaking solid waste integrated treatment process as claimed in claim 1, wherein the pavior brick manufacturing process comprises the steps of: treating coarse tailings again by using a 10mm screen, removing tailings, adding 390-450 parts of the treated coarse tailings, 200-260 parts of extra-fine sand and 130-160 parts of cement into a stirrer, stirring and uniformly mixing to obtain a pavior brick matrix, manufacturing and molding the pavior brick matrix and a fabric in a brick making machine according to a mass ratio of (8-12) to 1, and naturally curing for 3-7 days by spraying water, wherein the fabric comprises cement, medium sand and pigment;
the manufacturing process of the foaming brick comprises the following steps: ball-milling the filter-pressed mud cake by a ball mill, detecting the water content, adding superfine sand according to the proportion of (1-0.5) of a dry material 1, adding water to obtain slurry with the water content of 30-40%, detecting the water content of the slurry, adding cement, foaming ingredients and a water reducing agent into the slurry, uniformly stirring, controlling the water-material ratio to be below 0.43, injecting into a mold, standing and foaming for 30-75 min to obtain a blank, cutting and packaging the blank, and maintaining for more than 14 days to obtain the high-performance concrete.
4. The steelmaking solid waste integrated treatment process as claimed in claim 1, wherein in the pavior brick manufacturing process, the mass ratio of cement, medium sand and pigment in the facing material is 1:1: 0.3;
preferably, the granularity of the mud cake after ball milling in the manufacturing process of the foaming brick is less than 0.3 mm;
preferably, the mass ratio of the cement to the water reducing agent to the foaming ingredients in the preparation process of the foaming brick is (500-600): 1.5-2.5): 1.
5. The steelmaking solid waste integrated treatment process as claimed in claim 1, wherein the content of the more than 80 mesh fraction in the coarse ore obtained after ball milling is below 30%;
preferably, the magnetic induction intensity during the magnetic rolling treatment is 200-600 mT;
preferably, the overflow particle size is controlled to be less than 0.01mm during centrifugal sedimentation, and the content of the particle fraction is controlled to be more than 80 percent;
preferably, the mesh opening of the dewatering screen is 0.3mm when the tailings are drained in a dry mode.
6. The steelmaking solid waste integrated treatment process as claimed in claim 1, wherein the slurry is further subjected to sand washing treatment before centrifugal settling, coarse-grained materials obtained after sand washing are directly subjected to tailing dry discharge to obtain extra-fine sand, heavy metals and slurry are obtained after overflow materials are subjected to table shaking treatment, the heavy metals enter an ore pond, and the slurry is subjected to centrifugal settling;
preferably, the content of the coarse material with the granularity of more than 0.2mm is controlled to be more than 90 percent, and the content of the overflow material with the granularity of less than 0.2mm is controlled to be less than 90 percent.
7. The integrated treatment process for steelmaking solid waste according to claim 1, wherein the steelmaking waste is one or more of steelmaking electric furnace slag, medium frequency furnace slag, rod grinding material, pig iron tailing and desulphurization slag.
8. The integrated treatment device for the steelmaking solid waste is characterized by comprising a crusher and a ball mill which are sequentially connected, wherein a discharge port of the ball mill is connected with a rotary screen, a discharge port at the bottom of the rotary screen is connected with a magnetic separator, a concentrate outlet of the magnetic separator obtains iron ore powder, a tailing outlet of the magnetic separator is connected with a cyclone, an outlet at the bottom of the cyclone is connected with a dewatering screen, superfine sand is obtained after the dewatering screen is treated, and an overflow port of the cyclone is connected with a filter press through a thickener; the discharge port of the tail part of the rotary screen is connected with the magnetic roller, the tailing outlet of the magnetic roller is connected with the screen, and the discharge port at the bottom of the screen is connected with the jigger.
9. The integrated steelmaking solid waste treatment device as claimed in claim 8, wherein the tailings outlet of the magnetic separator is connected through a spiral sand washer, the sand outlet of the spiral sand washer is connected with a dewatering screen, the spout of the spiral sand washer is connected with a shaking table, and the water outlet of the shaking table is connected with a cyclone.
10. The integrated steelmaking solid waste treatment device as claimed in claim 8, wherein four crushers are arranged in series, the four crushers are 400 x 600mm, 250 x 1000mm, 150 x 400mm and 150 x 400mm in sequence, and the discharge port of each crusher is connected with the bin of the ball mill through a 16 x 16mm vibrating screen.
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| CN111571768A (en) * | 2020-05-19 | 2020-08-25 | 绵阳市固坤新型墙体材料有限公司 | Method for producing fine iron powder waste residue foamed brick |
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| JPS59123706A (en) * | 1982-12-28 | 1984-07-17 | Kawasaki Steel Corp | Treatment of desulfurized slag |
| CN101412634A (en) * | 2008-11-10 | 2009-04-22 | 西安理工大学 | Method for manufacturing foaming brick from waste construction material |
| CN101693928A (en) * | 2009-10-16 | 2010-04-14 | 首钢总公司 | Method for purifying primarily selected slag steel |
| CN106824513A (en) * | 2017-03-28 | 2017-06-13 | 响水恒生不锈钢铸造有限公司 | Slag crushing screening plant |
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