CN112169973A - Steel slag integrated efficient grinding and iron recovery system and method - Google Patents

Steel slag integrated efficient grinding and iron recovery system and method Download PDF

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Publication number
CN112169973A
CN112169973A CN202010945366.1A CN202010945366A CN112169973A CN 112169973 A CN112169973 A CN 112169973A CN 202010945366 A CN202010945366 A CN 202010945366A CN 112169973 A CN112169973 A CN 112169973A
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China
Prior art keywords
iron
steel slag
scraper
grinding disc
shoveling
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CN202010945366.1A
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Chinese (zh)
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CN112169973B (en
Inventor
彭林山
刘建
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Chengdu Design & Research Institute Of Building Materials Industry Co ltd
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Chengdu Design & Research Institute Of Building Materials Industry Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/02—Feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/16—Rigid blades, e.g. scrapers; Flexible blades, e.g. wipers
    • B08B1/165—Scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2201/00—Codes relating to disintegrating devices adapted for specific materials
    • B02C2201/06—Codes relating to disintegrating devices adapted for specific materials for garbage, waste or sewage

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

The invention relates to the field of steel slag treatment and utilization, aims to solve the problems of low grinding efficiency, high energy consumption and low iron recovery rate in the conventional steel slag recovery process, and provides a steel slag integrated efficient grinding and iron recovery system and method, wherein in the steel slag integrated efficient grinding and iron recovery method, a steel slag material flow is fed into a steady flow bin through a steel slag feeding system; after the steel slag enters the roller press, the roller press extrudes and crushes the steel slag until steel slag particles generate microcracks; the steel slag material flow which generates micro-cracks through extrusion and crushing enters a vibrating screen to be screened and then enters a vertical mill to be crushed and ground, the crushed and ground steel slag has iron and iron-containing substances enriched at the internal corner between a material blocking ring and a grinding disc, and the iron and iron-containing substances are led out of the mill through an iron removal device. The invention has the advantages of high grinding efficiency, low energy consumption and high iron recovery rate.

Description

Steel slag integrated efficient grinding and iron recovery system and method
Technical Field
The invention relates to the field of steel slag treatment and utilization, in particular to a steel slag integrated efficient grinding and iron recovery system and a method.
Background
The steel slag is an industrial byproduct discharged in the steel making process, and has high iron content, poor grindability and poor volume stability.
At present, the annual steel production of China is over 3 hundred million tons, the steel slag yield is about 4000 million tons, the utilization rate is about 10 percent, and in addition, 2 hundred million tons of unprocessed steel slag are piled up for years, and the occupied area is 3 million mu.
Therefore, the treatment and the comprehensive utilization of the steel slag can not only generate huge economic benefits, but also generate huge social and environmental benefits. At present, the steel slag is mostly used for sea reclamation or road base material at home and abroad, has low added value, is limited by transportation radius and has low utilization rate. According to relevant standards such as GB/T51387-2019 Steel slag treatment and comprehensive utilization technical standard and investigation on terminal market, the method considers that a large amount of steel slag is efficiently utilized, and the method for producing steel slag micro powder by grinding the steel slag is an effective way for solving the problem of terminal utilization of the steel slag.
The existing steel slag micro powder production technology can roughly sum up as follows: crushing the steel slag into certain granularity by 2-3 sections by using a crusher (a jaw crusher, a cone crusher and the like), performing fine grinding by using a ball mill, and recovering iron in the steel slag by magnetic separation in the middle. The technical route generally has the problems of low grinding efficiency, high energy consumption and low iron recovery rate, and the large-scale comprehensive utilization of the steel slag is difficult. Therefore, the method for grinding steel slag and recycling iron, which is efficient, energy-saving and environment-friendly, is the work which needs to be carried out urgently at present.
Disclosure of Invention
The invention aims to provide a method for integrally and efficiently grinding steel slag and recovering iron, which aims to solve the technical problem.
The embodiment of the invention is realized by the following steps:
a steel slag integrated efficient grinding and iron recovery method comprises the steps of feeding a steel slag material flow to a steady flow bin through a steel slag feeding system; the steady flow bin buffers materials and forms a material column with a certain height so as to keep the feeding pressure and the feeding quantity of the roller press stable; after the steel slag in the material column form enters a roller press, the roller press extrudes and crushes the steel slag until steel slag particles generate microcracks; feeding the steel slag material flow which generates micro cracks through extrusion and crushing into a vibrating screen, feeding the fine material flow screened out by the vibrating screen into a magnetic separator, and returning the coarse material flow screened out by the vibrating screen to a steady flow bin to be extruded and crushed again through a roller press; the slag steel selected by the magnetic separator enters the slag steel storage for subsequent recovery, and the slag steel discharged by the magnetic separator enters the intermediate storage;
the steel slag flow is discharged from the middle storage chamber and enters a vertical mill, the steel slag flow is spirally scattered at the center of a grinding disc in the vertical mill through feeding, a rotating grinding disc generates centrifugal force, the steel slag moves to the edge of the grinding disc under the action of the centrifugal force, the grinding roller is also positioned at the edge of the grinding disc, the bottom of the grinding roller is engaged with the steel slag coming from the center of the grinding disc and is matched with the grinding disc to form a material bed, and the steel slag is crushed and ground; the crushed and ground steel slag passes over the material blocking ring under the action of the discharging and squeezing of the subsequent steel slag flow and the centrifugal force, and then flows out of the grinding disc to be sorted and dried, and the steel slag micro powder with qualified particle size is taken out of the vertical mill along with the airflow and is collected by a dust collector to be used as a product; the unqualified steel slag with larger grain size enters the vertical mill again to be crushed and ground again;
the steel slag is crushed and ground in a material bed formed by the grinding roller and the grinding disc, the grain size is further reduced, and iron-containing substances in the steel slag are further stripped; and (3) leading out the iron and the iron-containing substances enriched at the internal corner between the material blocking ring and the grinding disc from the grinding disc, and leading the iron and the iron-containing substances led out from the grinding disc out of the vertical mill and into a magnetic separator for further purification to produce an iron concentrate powder product.
The scheme has the advantages and positive effects that: the roller press is used as a section of grinding device to form a four-side limited material bed, and the energy rate is high. Under high pressure, the particle size of the steel slag is further reduced, and the steel slag particles generate micro cracks, so that iron-containing substances can be more fully stripped by a subsequent vertical mill; in the grinding and grinding stage of the vertical mill, a material bed with two limited side surfaces is formed between the grinding roller and the grinding disc, steel slag particles with microcracks are circulated in the mill in a large amount, and repeatedly enter the material bed for multiple times to be gradually ground and ground to form steel slag micro powder. Meanwhile, the inventor researches and discovers that the steel slag is crushed and ground in the material bed, the particle size is further reduced, iron and iron-containing substances in the steel slag can be further stripped, however, the iron and the iron-containing substances have higher true density and smaller friction force between particles and cannot easily cross the material blocking ring, so that the steel slag can be enriched at the internal corner between the material blocking ring and the grinding disc; after a certain degree of enrichment, the grinding efficiency is reduced, and the abrasion of the abrasion-resistant materials of the grinding rolls and the grinding discs is increased. Through leading out iron and the iron-containing substance in the mill in this scheme, can avoid iron and iron-containing substance enrichment and reduce grinding efficiency and aggravate the wearing and tearing of grinding roller and mill wear-resisting material, and reduced the grinding energy consumption. The other remarkable effect is that in the process of forming steel slag micro powder from steel slag, the particle size is reduced to be less than 100 mu m, iron and iron-containing substances can be completely stripped from the steel slag, and the particle size of the stripped iron and iron-containing substances is also less than 100 mu m, the fine iron micro powder is difficult to separate and take out from the steel slag micro powder by using the traditional magnetic separation equipment, the iron micro powder has the characteristic of being enriched at the inner side of the edge of a grinding disc, the iron in the steel slag is further recovered by taking out the iron micro powder, and the vicious circle process that the iron and the iron-containing substances repeatedly enter grinding is effectively avoided. Finally, the grinding and stripping, the enrichment at the specific position and the extraction are carried out simultaneously, so that the continuous and integrated grinding and iron recovery operation is realized.
In conclusion, the scheme can efficiently realize the grinding recovery of the steel slag through the arrangement of the structure, and compared with the prior art, the energy consumption is obviously reduced.
In one embodiment:
the steel slag material flow from the steel slag feeding system has the particle size of 0-31.5mm and the flow rate of 215 t/h; after the steel slag material flow is stabilized by a steady flow bin, the steel slag material flow enters a roller press by the material flow with the flow rate of 520 t/h;
after being screened by the vibrating screen, a material flow with the particle size of 0-5mm and the flow rate of 215t/h and a material flow with the particle size of 5-31.5mm and the flow rate of 305t/h are generated; wherein, the material flow with the particle size of 5-31.5mm and the flow rate of 305t/h returns to the steady flow bin, and the material flow with the particle size of 0-5mm and the flow rate of 215t/h enters a magnetic separator for iron removal;
after iron is removed by the magnetic separator, a slag steel material flow with the particle size of 0-5mm and the flow rate of 3t/h and a material flow with the particle size of 0-5mm and the flow rate of 212t/h are generated; wherein the slag steel material flow with the particle size of 0-5mm and the flow rate of 3t/h enters slag steel for storage; the material flow with the particle size of 0-5mm and the flow rate of 212t/h enters an intermediate storage bin for storage;
the middle storage bin generates a material flow with the particle size of 0-5mm and the flow rate of 212t/h, the material flow enters a vertical mill, iron is removed in the mill of the vertical mill to generate the material flow with the particle size of 0-1mm and the flow rate of 2t/h, and the material flow subsequently enters a magnetic separator for purification and is stored in iron powder after purification;
the material flow with the particle size of 0-45 mu m and the flow rate of 210t/h generated by the vertical mill enters a dust collector, and the steel slag micro powder is collected and stored.
In one embodiment:
the iron and iron-containing substances enriched at the internal corner between the material blocking ring and the grinding disc are led out from the grinding disc in a way of adopting a new mechanical structure for removing iron, namely, an in-mill mechanical device is arranged in the vertical mill and is used for leading out the enriched iron or iron-containing substances;
the in-mill mechanical device comprises a bracket, a spiral conveying mechanism and a movable scraper group;
the spiral conveying mechanism is horizontally and fixedly connected to the support, a conveying inlet end of the spiral conveying mechanism is positioned on the inner side of a grinding disc of the vertical mill and corresponds to the position above an internal corner between a material blocking ring and the grinding disc of the vertical mill, and a conveying outlet end of the spiral conveying mechanism is used as an outlet of iron or iron-containing substances;
the movable scraper group comprises a material blocking scraper and a material shoveling scraper; the material blocking scraper is fan-shaped, and the central point of the fan-shaped is used as the rotation center of the material blocking scraper; the material shoveling scraper is enclosed into a material cavity which is communicated from the radial outer end to the radial inner end of the material shoveling scraper, and the radial inner end of the material shoveling scraper is provided with a rotating center; the radial outer end of the material cavity forms a shoveling inlet, and the radial inner end forms a shoveling outlet;
the material blocking scraper and the material shoveling scraper are coaxially and rotatably arranged on the support through respective rotation centers and can be driven to respectively rotate along the same horizontal axis to a first position enabling the radial outer end of the material blocking scraper to be located on the upper side to be far away from the grinding disc or a second position located on the lower side to be close to the grinding disc; when the material shoveling scraper is in the first position, the shoveling outlet of the shoveling scraper corresponds to the conveying inlet end of the spiral conveying mechanism;
wherein, in the first position: the material blocking scraper and the material shoveling scraper are far away from the steel slag on the grinding disc and cannot block the steel slag and the iron or iron-containing substances enriched at the lower layer from moving along with the grinding disc;
in the second position: the radial outer end of the material blocking scraper is positioned at the upstream of the movement direction of the grinding disc and blocks the movement of the steel slag positioned at the upper layer, and the iron or iron-containing substances enriched at the lower layer can pass through the gap between the radial outer end of the material blocking scraper and the upper surface of the grinding disc; meanwhile, the radial outer end of the shoveling scraper is positioned at the downstream of the motion direction of the grinding disc, and a shoveling inlet at the radial outer end of the shoveling scraper extends into the lower layer of iron or iron-containing substance so as to scrape the iron or iron-containing substance which is not blocked by the material blocking scraper and moves along with the grinding disc into a material cavity of the material blocking scraper.
When the mechanical device in the mill is arranged, the movable scraper group can rotate from the first position to the second position and stop at the second position so that the material blocking scraper blocks the upper layer of steel slag and scrapes the lower layer of enriched iron or iron-containing substances into the material cavity of the material shoveling scraper; after scraping the materials for a certain time, the movable scraper group rotates from the second position to the first position to finish the material shoveling, and simultaneously, iron or iron-containing substances scraped by the material shoveling scraper are poured into the conveying inlet end of the spiral conveying mechanism from the material shoveling outlet along with the material shoveling scraper rotating to the upper first position, and then are conveyed to the conveying outlet end by the spiral conveying mechanism to finish the iron removal in the mill.
In one embodiment:
the spiral conveying mechanism is driven by a driving part.
The invention also provides a steel slag integrated efficient grinding and iron recovery system, which comprises a steady flow bin, wherein the steady flow bin is provided with a steel slag feeding port; the steady flow bin is communicated with the roller press, the roller press is communicated with the vibrating screen, and a feed back port of the vibrating screen is communicated with the roller press and a discharge port is communicated with the magnetic separator; one path of the magnetic separator is communicated to the middle storage bin, and the other path of the magnetic separator is communicated to the slag steel for storage; the middle storage bin is communicated with a vertical mill, one path of the vertical mill is communicated with another magnetic separator, one path of the magnetic separator is communicated with iron powder for storage, the other path of the vertical mill is communicated with an inlet of the vertical mill, the other path of the vertical mill is communicated with a dust collector, and the dust collector collects the dust and then communicates the dust and the steel slag micro powder for storage; and an in-mill mechanical device is arranged in the vertical mill and used for discharging iron enriched in the vertical mill.
In one embodiment:
and an outlet of the dust collector is communicated with a fan, one path of the fan is discharged in a jet-air mode, and the other path of the fan is connected to the inside of the vertical mill in a return mode.
In one embodiment:
the in-mill mechanical device comprises a bracket, a spiral conveying mechanism and a movable scraper group;
the spiral conveying mechanism is horizontally and fixedly connected to the support, a conveying inlet end of the spiral conveying mechanism is positioned on the inner side of a grinding disc of the vertical mill and corresponds to the position above an internal corner between a material blocking ring and the grinding disc of the vertical mill, and a conveying outlet end of the spiral conveying mechanism is used as an outlet of iron or iron-containing substances;
the movable scraper group comprises a material blocking scraper and a material shoveling scraper; the material blocking scraper is fan-shaped, and the central point of the fan-shaped is used as the rotation center of the material blocking scraper; the material shoveling scraper is enclosed into a material cavity which is communicated from the radial outer end to the radial inner end of the material shoveling scraper, and the radial inner end of the material shoveling scraper is provided with a rotating center; the radial outer end of the material cavity forms a shoveling inlet, and the radial inner end forms a shoveling outlet;
the material blocking scraper and the material shoveling scraper are coaxially and rotatably arranged on the support through respective rotation centers and can be driven to respectively rotate along the same horizontal axis to a first position enabling the radial outer end of the material blocking scraper to be located on the upper side to be far away from the grinding disc or a second position located on the lower side to be close to the grinding disc; when the material shoveling scraper is in the first position, the shoveling outlet of the shoveling scraper corresponds to the conveying inlet end of the spiral conveying mechanism;
wherein, in the first position: the material blocking scraper and the material shoveling scraper are far away from the steel slag on the grinding disc and cannot block the steel slag and the iron or iron-containing substances enriched at the lower layer from moving along with the grinding disc;
in the second position: the radial outer end of the material blocking scraper is positioned at the upstream of the movement direction of the grinding disc and blocks the movement of the steel slag positioned at the upper layer, and the iron or iron-containing substances enriched at the lower layer can pass through the gap between the radial outer end of the material blocking scraper and the upper surface of the grinding disc; meanwhile, the radial outer end of the shoveling scraper is positioned at the downstream of the motion direction of the grinding disc, and a shoveling inlet at the radial outer end of the shoveling scraper extends into the lower layer of iron or iron-containing substance so as to scrape the iron or iron-containing substance which is not blocked by the material blocking scraper and moves along with the grinding disc into a material cavity of the material blocking scraper.
When the in-mill mechanical device in the scheme is used, the movable scraper set can rotate from the first position to the second position and stop at the second position so that the material blocking scraper blocks the upper layer of steel slag and scrapes the lower layer of enriched iron or iron-containing substances into the material cavity of the material shoveling scraper; after scraping the materials for a certain time, the movable scraper group rotates from the second position to the first position to finish the material shoveling, and simultaneously, iron or iron-containing substances scraped by the material shoveling scraper are poured into the conveying inlet end of the spiral conveying mechanism from the material shoveling outlet along with the material shoveling scraper rotating to the upper first position, and then are conveyed to the conveying outlet end by the spiral conveying mechanism to finish the iron removal in the mill.
In one embodiment:
the support is fixedly connected to the shell of the vertical mill.
In one embodiment:
and the spiral mandrel of the spiral conveying mechanism is coaxial with the rotating axis of the movable scraper group.
In one embodiment:
the spiral conveying mechanism is driven by a driving part.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings referred to in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from these drawings without inventive effort.
FIG. 1 is a schematic view of an integrated steel slag efficient grinding and iron recovery system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the mechanism inside the mill;
a schematic view of the movable blade set of fig. 2 in direction B is shown in fig. 3 (the movable blade set in a second position);
a schematic view of the movable blade set in the first position is shown in fig. 4.
Icon: the system comprises a steel slag integrated efficient grinding and iron recovery system 10, a steady flow bin 11, a steel slag feeding port 12, a roller press 13, a vibrating screen 14, a magnetic separator 16, an intermediate storage bin 17, a steel slag storage 18, a vertical mill 19, a magnetic separator 20, an iron powder storage 21, a dust collector 22, a steel slag micro powder storage 23, an in-mill mechanical device 24, a fan 25, a support 27, a spiral conveying mechanism 28, a movable scraper group 29, a conveying inlet end 30, a grinding disc 31, a material blocking ring 32, an internal corner 33, a conveying outlet end 34, a material blocking scraper 35, a material shoveling scraper 36, a material cavity 39, a rotation center 40, a material shoveling inlet 41, a material shoveling outlet 42, a first position 43, a second position 44, steel slag 45, iron or iron-containing substances 46, a grinding disc movement direction 47, a gap 48, a driving part 49 and a shell 50.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1, the present embodiment provides a steel slag integrated efficient grinding and iron recovery system 10, which includes a steady flow bin 11, wherein the steady flow bin 11 has a steel slag feeding port 12; the steady flow bin 11 is communicated with a roller press 13, the roller press 13 is communicated with a vibrating screen 14, a feed back port of the vibrating screen 14 is communicated with the roller press 13, and a discharge port is communicated with a magnetic separator 16; one path of the magnetic separator 16 is communicated with the intermediate storage bin 17, and the other path is communicated with the slag steel storage 18; the middle storage bin 17 is communicated with a vertical mill 19, one path of the vertical mill 19 is communicated with another magnetic separator 20, one path of the magnetic separator 20 is communicated with an iron powder storage 21, the other path of the magnetic separator is communicated with an inlet of the vertical mill 19, the other path of the vertical mill 19 is communicated with a dust collector 22, and the dust collector 22 is communicated with a steel slag micro powder storage 23 after being collected; the steel slag micro powder vertical mill 19 is internally provided with an in-mill mechanical device 24 for discharging iron enriched in the vertical mill 19. Optionally, an outlet of the steel slag micro-powder dust collector 22 is communicated with a fan 25, one path of the fan 25 is discharged in a jet mode, and the other path of the fan is connected back to the vertical mill 19.
In this embodiment, the in-mill mechanism 24 includes a holder 27, a screw conveying mechanism 28, and a movable blade group 29; the steel slag micro powder screw conveying mechanism 28 is horizontally and fixedly connected to the steel slag micro powder bracket 27, a conveying inlet end 30 of the screw conveying mechanism 28 is positioned on the inner side of a grinding disc 31 of the vertical mill 19 and corresponds to the position above an internal corner 33 between a material stopping ring 32 and the grinding disc 31 of the vertical mill 19, and a conveying outlet end 34 thereof is used as an outlet of iron or an iron-containing substance 46; the steel slag micro powder movable scraper group 29 comprises a material blocking scraper 35 and a material shoveling scraper 36; the steel slag micro powder material blocking scraper 35 is fan-shaped, and the center point of the fan-shaped is used as the rotation center 40 of the steel slag micro powder material blocking scraper; the steel slag micro powder shoveling scraper 36 is enclosed into a material cavity 39 which is through from the radial outer end to the radial inner end, and the radial inner end is provided with a rotating center 40; the radial outer end of the material cavity 39 forms a material shoveling inlet 41, and the radial inner end forms a material shoveling outlet 42; the steel slag micro powder blocking scraper 35 and the steel slag micro powder shoveling scraper 36 are coaxially and rotatably arranged on the steel slag micro powder support 27 through respective rotating centers 40, and can be driven to respectively rotate along the same horizontal axis to enable the radial outer ends of the steel slag micro powder blocking scraper and the steel slag micro powder shoveling scraper to be located at an upper first position 43 to be far away from the grinding disc 31 or a lower second position 44 to be close to the grinding disc 31; in the first position 43, the scooping outlet 42 of the steel slag micro powder scooping blade 36 corresponds to the conveyance inlet end 30 of the screw conveyor 28.
Wherein, at the first position 43 of the steel slag micro powder: the steel slag micro powder blocking scraper 35 and the steel slag micro powder shoveling scraper 36 are far away from the steel slag 45 on the grinding disc 31 and cannot block the steel slag 45 and the lower layer enriched iron or iron-containing substance 46 from moving along with the grinding disc 31;
at the second position 44 of the steel slag micro powder: the radial outer end of the steel slag micro powder material blocking scraper 35 is positioned at the upstream of the motion direction of the grinding disc 31 and blocks the motion of the steel slag 45 positioned at the upper layer, and the iron or iron-containing substances 46 enriched at the lower layer can pass through a gap 48 between the radial outer end of the material blocking scraper 35 and the upper surface of the grinding disc 31; meanwhile, the radial outer end of the steel slag micro powder shoveling scraper 36 is located at the downstream of the motion direction of the grinding disc 31, and the shoveling inlet 41 at the radial outer end extends into the lower layer of iron or iron-containing substance 46, so that the iron or iron-containing substance 46 which does not block by the blocking scraper 35 and moves along with the grinding disc 31 is scraped into the material cavity 39.
Referring to fig. 2, 3 and 4, when the in-mill mechanical device 24 in the present embodiment is used, the steel slag micro-powder movable scraper set 29 can rotate from the first position 43 to the second position 44, and stop at the second position 44, so that the material blocking scraper 35 blocks the upper layer of steel slag 45, and scrapes the lower layer of enriched iron or iron-containing substance 46 into the material cavity 39 of the material shoveling scraper 36; after a certain time of scraping, the steel slag micro powder movable scraper set 29 rotates from the second position 44 to the first position 43 to finish the material shoveling, and at the same time, the iron or iron-containing substances 46 scraped by the material shoveling scraper 36 are poured into the conveying inlet end 30 of the screw conveying mechanism 28 from the material shoveling outlet 42 thereof along with the material shoveling scraper 36 rotating to the upper first position 43, and then are conveyed to the conveying outlet end 34 thereof by the screw conveying mechanism 28 to finish the in-mill iron removal.
In one embodiment, optionally, the steel slag micropowder support 27 is fixedly attached to the housing 50 of the vertical mill 19.
The spiral mandrel of the steel slag micro powder spiral conveying mechanism 28 and the rotating axis of the steel slag micro powder movable scraper set 29 are coaxial. The steel slag micro powder screw conveying mechanism 28 is driven by a driving member 49.
The embodiment also provides a steel slag integrated efficient grinding and iron recovery method, wherein a steel slag material flow is fed into the steady flow bin 11 through a steel slag feeding system; the steady flow bin 11 buffers materials and forms a material column with a certain height so as to keep the feeding pressure and the feeding quantity of the roller press 13 stable; after the steel slag 45 in the form of material columns enters the roller press 13, the roller press 13 extrudes and crushes the steel slag 45 until steel slag particles generate microcracks; the steel slag material flow which generates micro cracks through extrusion and crushing enters a vibrating screen 14, the fine material flow screened out by the vibrating screen 14 enters a magnetic separator 16, and the coarse material flow screened out by the vibrating screen 14 returns to a steady flow bin 11 and is extruded and crushed through a roller press 13 again; the slag steel selected by the magnetic separator 16 enters a slag steel storage 18 for subsequent recovery, and the slag steel 45 discharged by the magnetic separator 16 enters an intermediate storage;
stable steel slag 45 is discharged from the middle storage bin and flows into the vertical mill 19, the steel slag 45 flows through the feeding spiral and is scattered at the center of the grinding disc 31 in the vertical mill 19, the rotating grinding disc 31 generates centrifugal force, the steel slag 45 moves to the edge of the grinding disc 31 under the action of the centrifugal force, the grinding roller is also positioned at the edge of the grinding disc 31, the bottom of the grinding roller is engaged with the steel slag 45 from the center of the grinding disc 31 and is matched with the grinding disc 31 to form a material bed, and the steel slag 45 is crushed and ground; the crushed and ground steel slag 45 passes over the material blocking ring 32 under the extrusion of subsequent steel slag 45 flow and the action of centrifugal force, and then gushes out of the grinding disc 31 to be sorted and dried, and the steel slag micro powder with qualified particle size is taken out of the vertical mill 19 along with air flow and is collected by the dust collector 22 to be used as a product; the unqualified steel slag 45 with larger grain size enters the vertical mill 19 again for crushing and grinding again;
the steel slag 45 is crushed and ground in a material bed formed by the grinding rolls and the grinding disc 31, the particle size is further reduced, and iron-containing substances in the steel slag 45 are further stripped; the iron and iron-containing substances enriched at the internal corner 33 between the material baffle ring 32 and the grinding disc 31 are led out from the grinding disc 31, and the iron and iron-containing substances led out from the grinding disc 31 leave the vertical mill 19 and enter the magnetic separator 20 for further purification to produce fine iron powder products.
The scheme has the advantages and positive effects that: the roller press 13 is used as a section of grinding device to form a four-side limited material bed, and the energy rate is high. Under high pressure, the particle size of the steel slag 45 is further reduced, and the steel slag particles generate micro cracks, so that the subsequent vertical mill 19 can more fully strip out iron-containing substances; in the crushing and grinding stage of the vertical mill 19, a material bed with two limited side surfaces is formed between the grinding roller and the grinding disc 31, steel slag particles with microcracks are circulated in the mill in a large amount, and enter the material bed repeatedly for many times to be crushed and ground gradually to form steel slag micro powder. Meanwhile, the inventor researches and discovers that the steel slag 45 is crushed and ground in the material bed, the particle size is further reduced, iron and iron-containing substances in the steel slag 45 can be further stripped, however, the iron and the iron-containing substances have higher true density and smaller friction force among particles, and cannot easily cross the material stopping ring 32, so that the iron and the iron-containing substances can be enriched at the internal corner 33 between the material stopping ring 32 and the grinding disc 31; after a certain enrichment, the grinding efficiency is reduced, and the abrasion of the abrasive materials of the grinding rolls and the grinding disc 31 is increased. In the scheme, by leading out iron and iron-containing substances in the mill, the enrichment of the iron and the iron-containing substances can be avoided, the grinding efficiency is reduced, the abrasion of the grinding roller and the grinding disc 31 wear-resistant material is aggravated, and the grinding energy consumption is reduced. Another significant effect is that in the process of forming steel slag micropowder from steel slag 45, the particle size is reduced to below 100 μm, iron and iron-containing substances can be stripped from steel slag 45 relatively completely, and the particle size of the stripped iron and iron-containing substances is also smaller than 100 μm, so that the fine iron micropowder is difficult to separate and take out from the steel slag micropowder by using the traditional magnetic separation equipment, and the iron micropowder has the characteristic of being enriched at the inner side of the edge of grinding disc 31, and by taking out the iron micropowder, the iron in steel slag 45 is further recovered, and the vicious circle process that the iron and iron-containing substances repeatedly enter grinding is effectively avoided. Finally, the grinding and stripping, the enrichment at the specific position and the extraction are carried out simultaneously, so that the continuous and integrated grinding and iron recovery operation is realized.
Wherein, the iron and iron-containing substances enriched at the internal corner 33 between the material baffle ring 32 and the grinding disc 31 are led out from the grinding disc 31 by adopting a new mechanical structure for removing iron, namely, an in-mill mechanical device 24 is arranged in the vertical mill 19 for leading out the enriched iron or iron-containing substances 46; wherein, the in-mill mechanical device 24 comprises a bracket 27, a spiral conveying mechanism 28 and a movable scraper group 29;
the steel slag micro powder screw conveying mechanism 28 is horizontally and fixedly connected to the steel slag micro powder bracket 27, a conveying inlet end 30 of the screw conveying mechanism 28 is positioned on the inner side of a grinding disc 31 of the vertical mill 19 and corresponds to the position above an internal corner 33 between a material stopping ring 32 and the grinding disc 31 of the vertical mill 19, and a conveying outlet end 34 thereof is used as an outlet of iron or an iron-containing substance 46;
the steel slag micro powder movable scraper group 29 comprises a material blocking scraper 35 and a material shoveling scraper 36; the steel slag micro powder material blocking scraper 35 is fan-shaped, and the center point of the fan-shaped is used as the rotation center 40 of the steel slag micro powder material blocking scraper; the steel slag micro powder shoveling scraper 36 is enclosed into a material cavity 39 which is through from the radial outer end to the radial inner end, and the radial inner end is provided with a rotating center 40; the radial outer end of the material cavity 39 forms a material shoveling inlet 41, and the radial inner end forms a material shoveling outlet 42;
the steel slag micro powder blocking scraper 35 and the steel slag micro powder shoveling scraper 36 are coaxially and rotatably arranged on the steel slag micro powder support 27 through respective rotating centers 40, and can be driven to respectively rotate along the same horizontal axis to enable the radial outer ends of the steel slag micro powder blocking scraper and the steel slag micro powder shoveling scraper to be located at an upper first position 43 to be far away from the grinding disc 31 or a lower second position 44 to be close to the grinding disc 31; in the first position 43, the shoveling outlet 42 of the steel slag micro powder shoveling scraper 36 corresponds to the conveying inlet end 30 of the screw conveying mechanism 28;
wherein, at the first position 43 of the steel slag micro powder: the steel slag micro powder blocking scraper 35 and the steel slag micro powder shoveling scraper 36 are far away from the steel slag 45 on the grinding disc 31 and cannot block the steel slag 45 and the lower layer enriched iron or iron-containing substance 46 from moving along with the grinding disc 31;
at the second position 44 of the steel slag micro powder: the radial outer end of the steel slag micro powder material blocking scraper 35 is positioned at the upstream of the motion direction of the grinding disc 31 and blocks the motion of the steel slag 45 positioned at the upper layer, and the iron or iron-containing substances 46 enriched at the lower layer can pass through a gap 48 between the radial outer end of the material blocking scraper 35 and the upper surface of the grinding disc 31; meanwhile, the radial outer end of the steel slag micro powder shoveling scraper 36 is located at the downstream of the motion direction of the grinding disc 31, and the shoveling inlet 41 at the radial outer end extends into the lower layer of iron or iron-containing substance 46, so that the iron or iron-containing substance 46 which does not block by the blocking scraper 35 and moves along with the grinding disc 31 is scraped into the material cavity 39.
When the in-mill mechanical device 24 is arranged, the steel slag micro-powder movable scraper set 29 can rotate from the first position 43 to the second position 44 and stop at the second position 44, so that the material blocking scraper 35 blocks the upper layer of steel slag 45, and scrapes the lower layer of enriched iron or iron-containing substance 46 into the material cavity 39 of the material shoveling scraper 36; after a certain time of scraping, the steel slag micro powder movable scraper set 29 rotates from the second position 44 to the first position 43 to finish the material shoveling, and at the same time, the iron or iron-containing substances 46 scraped by the material shoveling scraper 36 are poured into the conveying inlet end 30 of the screw conveying mechanism 28 from the material shoveling outlet 42 thereof along with the material shoveling scraper 36 rotating to the upper first position 43, and then are conveyed to the conveying outlet end 34 thereof by the screw conveying mechanism 28 to finish the in-mill iron removal.
The screw conveyor 28 in this embodiment is driven by a drive member 49. Alternatively, the driving member 49 may be configured to include a motor and a speed reducer, wherein the motor drives the spiral mandrel of the spiral conveying mechanism 28 to rotate through the speed reducer, so as to drive the spiral conveying mechanism 28 to convey the substance.
In conclusion, the steel slag micro powder can efficiently realize grinding and recycling of the steel slag 45 through the arrangement of the structure, and the energy consumption is remarkably reduced compared with the prior art.
In the embodiment, the steel slag material flow from the steel slag feeding system has the particle size of 0-31.5mm and the flow rate of 215 t/h; after the steel slag material flow is stabilized by the steady flow bin 11, the steel slag material flow enters the roller press 13 with the material flow of 520 t/h;
after being screened by the vibrating screen 14, a material flow with the particle size of 0-5mm and the flow rate of 215t/h and a material flow with the particle size of 5-31.5mm and the flow rate of 305t/h are generated; wherein, the material flow with the particle size of 5-31.5mm and the flow rate of 305t/h returns to the steady flow bin 11, and the material flow with the particle size of 0-5mm and the flow rate of 215t/h enters the magnetic separator 2016 for iron removal;
after iron is removed by the magnetic separator 2016, a slag steel material flow with the particle size of 0-5mm and the flow rate of 3t/h and a material flow with the particle size of 0-5mm and the flow rate of 212t/h are generated; wherein the slag steel material flow with the particle size of 0-5mm and the flow rate of 3t/h enters a slag steel storage 18; the material flow with the particle size of 0-5mm and the flow rate of 212t/h enters the intermediate storage bin 17 for storage;
the intermediate storage bin 17 generates a material flow with the particle size of 0-5mm and the flow rate of 212t/h, the material flow enters a vertical mill 19, iron is removed in the mill of the vertical mill 19 to generate a material flow with the particle size of 0-1mm and the flow rate of 2t/h, and the material flow subsequently enters a magnetic separator 2016 for purification and is stored in iron powder 21 after purification;
the material flow with the particle size of 0-45 mu m and the flow rate of 210t/h generated by the vertical mill 19 enters a dust collector 22, and the steel slag micro powder is stored after being collected.
The steel slag micropowder is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications and variations. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A steel slag integrated efficient grinding and iron recovery method is characterized in that:
feeding a steel slag material flow to a steady flow bin through a steel slag feeding system; the steady flow bin buffers materials and forms a material column with a certain height so as to keep the feeding pressure and the feeding quantity of the roller press stable; after the steel slag in the material column form enters a roller press, the roller press extrudes and crushes the steel slag until steel slag particles generate microcracks; feeding the steel slag material flow which generates micro cracks through extrusion and crushing into a vibrating screen, feeding the fine material flow screened out by the vibrating screen into a magnetic separator, and returning the coarse material flow screened out by the vibrating screen to a steady flow bin to be extruded and crushed again through a roller press; the slag steel selected by the magnetic separator enters the slag steel storage for subsequent recovery, and the slag steel discharged by the magnetic separator enters the intermediate storage;
the steel slag flow is discharged from the middle storage chamber and enters a vertical mill, the steel slag flow is spirally scattered at the center of a grinding disc in the vertical mill through feeding, a rotating grinding disc generates centrifugal force, the steel slag moves to the edge of the grinding disc under the action of the centrifugal force, the grinding roller is also positioned at the edge of the grinding disc, the bottom of the grinding roller is engaged with the steel slag coming from the center of the grinding disc and is matched with the grinding disc to form a material bed, and the steel slag is crushed and ground; the crushed and ground steel slag passes over the material blocking ring under the action of the discharging and squeezing of the subsequent steel slag flow and the centrifugal force, and then flows out of the grinding disc to be sorted and dried, and the steel slag micro powder with qualified particle size is taken out of the vertical mill along with the airflow and is collected by a dust collector to be used as a product; the unqualified steel slag with larger grain size enters the vertical mill again to be crushed and ground again;
the steel slag is crushed and ground in a material bed formed by the grinding roller and the grinding disc, the grain size is further reduced, and iron-containing substances in the steel slag are further stripped; and (3) leading out the iron and the iron-containing substances enriched at the internal corner between the material blocking ring and the grinding disc from the grinding disc, and leading the iron and the iron-containing substances led out from the grinding disc out of the vertical mill and into a magnetic separator for further purification to produce an iron concentrate powder product.
2. The integrated efficient steel slag grinding and iron recovery method according to claim 1, characterized in that:
the steel slag material flow from the steel slag feeding system has the particle size of 0-31.5mm and the flow rate of 215 t/h; after the steel slag material flow is stabilized by a steady flow bin, the steel slag material flow enters a roller press by the material flow with the flow rate of 520 t/h;
after being screened by the vibrating screen, a material flow with the particle size of 0-5mm and the flow rate of 215t/h and a material flow with the particle size of 5-31.5mm and the flow rate of 305t/h are generated; wherein, the material flow with the particle size of 5-31.5mm and the flow rate of 305t/h returns to the steady flow bin, and the material flow with the particle size of 0-5mm and the flow rate of 215t/h enters a magnetic separator for iron removal;
after iron is removed by the magnetic separator, a slag steel material flow with the particle size of 0-5mm and the flow rate of 3t/h and a material flow with the particle size of 0-5mm and the flow rate of 212t/h are generated; wherein the slag steel material flow with the particle size of 0-5mm and the flow rate of 3t/h enters slag steel for storage; the material flow with the particle size of 0-5mm and the flow rate of 212t/h enters an intermediate storage bin for storage;
the middle storage bin generates a material flow with the particle size of 0-5mm and the flow rate of 212t/h, the material flow enters a vertical mill, iron is removed in the mill of the vertical mill to generate the material flow with the particle size of 0-1mm and the flow rate of 2t/h, and the material flow subsequently enters a magnetic separator for purification and is stored in iron powder after purification;
the material flow with the particle size of 0-45 mu m and the flow rate of 210t/h generated by the vertical mill enters a dust collector, and the steel slag micro powder is collected and stored.
3. The integrated efficient steel slag grinding and iron recovery method according to claim 1, characterized in that:
the iron and iron-containing substances enriched at the internal corner between the material blocking ring and the grinding disc are led out from the grinding disc in a way of adopting a new mechanical structure for removing iron, namely, an in-mill mechanical device is arranged in the vertical mill and is used for leading out the enriched iron or iron-containing substances;
the in-mill mechanical device comprises a bracket, a spiral conveying mechanism and a movable scraper group;
the spiral conveying mechanism is horizontally and fixedly connected to the support, a conveying inlet end of the spiral conveying mechanism is positioned on the inner side of a grinding disc of the vertical mill and corresponds to the position above an internal corner between a material blocking ring and the grinding disc of the vertical mill, and a conveying outlet end of the spiral conveying mechanism is used as an outlet of iron or iron-containing substances;
the movable scraper group comprises a material blocking scraper and a material shoveling scraper; the material blocking scraper is fan-shaped, and the central point of the fan-shaped is used as the rotation center of the material blocking scraper; the material shoveling scraper is enclosed into a material cavity which is communicated from the radial outer end to the radial inner end of the material shoveling scraper, and the radial inner end of the material shoveling scraper is provided with a rotating center; the radial outer end of the material cavity forms a shoveling inlet, and the radial inner end forms a shoveling outlet;
the material blocking scraper and the material shoveling scraper are coaxially and rotatably arranged on the support through respective rotation centers and can be driven to respectively rotate along the same horizontal axis to a first position enabling the radial outer end of the material blocking scraper to be located on the upper side to be far away from the grinding disc or a second position located on the lower side to be close to the grinding disc; when the material shoveling scraper is in the first position, the shoveling outlet of the shoveling scraper corresponds to the conveying inlet end of the spiral conveying mechanism;
wherein, in the first position: the material blocking scraper and the material shoveling scraper are far away from the steel slag on the grinding disc and cannot block the steel slag and the iron or iron-containing substances enriched at the lower layer from moving along with the grinding disc;
in the second position: the radial outer end of the material blocking scraper is positioned at the upstream of the movement direction of the grinding disc and blocks the movement of the steel slag positioned at the upper layer, and the iron or iron-containing substances enriched at the lower layer can pass through the gap between the radial outer end of the material blocking scraper and the upper surface of the grinding disc; meanwhile, the radial outer end of the shoveling scraper is positioned at the downstream of the motion direction of the grinding disc, and a shoveling inlet at the radial outer end of the shoveling scraper extends into the lower layer of iron or iron-containing substance so as to scrape the iron or iron-containing substance which is not blocked by the material blocking scraper and moves along with the grinding disc into a material cavity of the material blocking scraper.
4. The integrated efficient steel slag grinding and iron recovery method according to claim 3, characterized in that:
the spiral conveying mechanism is driven by a driving part.
5. The utility model provides a high-efficient grinding of slag integration and indisputable recovery system which characterized in that:
comprises a steady flow bin, wherein the steady flow bin is provided with a steel slag feeding port; the steady flow bin is communicated with the roller press, the roller press is communicated with the vibrating screen, and a feed back port of the vibrating screen is communicated with the roller press and a discharge port is communicated with the magnetic separator; one path of the magnetic separator is communicated to the middle storage bin, and the other path of the magnetic separator is communicated to the slag steel for storage; the middle storage bin is communicated with a vertical mill, one path of the vertical mill is communicated with another magnetic separator, one path of the magnetic separator is communicated with iron powder for storage, the other path of the vertical mill is communicated with an inlet of the vertical mill, the other path of the vertical mill is communicated with a dust collector, and the dust collector collects the dust and then communicates the dust and the steel slag micro powder for storage; and an in-mill mechanical device is arranged in the vertical mill and used for discharging iron enriched in the vertical mill.
6. The steel slag integrated efficient grinding and iron recovery system according to claim 5, characterized in that:
and an outlet of the dust collector is communicated with a fan, one path of the fan is discharged in a jet-air mode, and the other path of the fan is connected to the inside of the vertical mill in a return mode.
7. The steel slag integrated efficient grinding and iron recovery system according to claim 5, characterized in that:
the in-mill mechanical device comprises a bracket, a spiral conveying mechanism and a movable scraper group;
the spiral conveying mechanism is horizontally and fixedly connected to the support, a conveying inlet end of the spiral conveying mechanism is positioned on the inner side of a grinding disc of the vertical mill and corresponds to the position above an internal corner between a material blocking ring and the grinding disc of the vertical mill, and a conveying outlet end of the spiral conveying mechanism is used as an outlet of iron or iron-containing substances;
the movable scraper group comprises a material blocking scraper and a material shoveling scraper; the material blocking scraper is fan-shaped, and the central point of the fan-shaped is used as the rotation center of the material blocking scraper; the material shoveling scraper is enclosed into a material cavity which is communicated from the radial outer end to the radial inner end of the material shoveling scraper, and the radial inner end of the material shoveling scraper is provided with a rotating center; the radial outer end of the material cavity forms a shoveling inlet, and the radial inner end forms a shoveling outlet;
the material blocking scraper and the material shoveling scraper are coaxially and rotatably arranged on the support through respective rotation centers and can be driven to respectively rotate along the same horizontal axis to a first position enabling the radial outer end of the material blocking scraper to be located on the upper side to be far away from the grinding disc or a second position located on the lower side to be close to the grinding disc; when the material shoveling scraper is in the first position, the shoveling outlet of the shoveling scraper corresponds to the conveying inlet end of the spiral conveying mechanism;
wherein, in the first position: the material blocking scraper and the material shoveling scraper are far away from the steel slag on the grinding disc and cannot block the steel slag and the iron or iron-containing substances enriched at the lower layer from moving along with the grinding disc;
in the second position: the radial outer end of the material blocking scraper is positioned at the upstream of the movement direction of the grinding disc and blocks the movement of the steel slag positioned at the upper layer, and the iron or iron-containing substances enriched at the lower layer can pass through the gap between the radial outer end of the material blocking scraper and the upper surface of the grinding disc; meanwhile, the radial outer end of the shoveling scraper is positioned at the downstream of the motion direction of the grinding disc, and a shoveling inlet at the radial outer end of the shoveling scraper extends into the lower layer of iron or iron-containing substance so as to scrape the iron or iron-containing substance which is not blocked by the material blocking scraper and moves along with the grinding disc into a material cavity of the material blocking scraper.
8. The steel slag integrated efficient grinding and iron recovery system according to claim 7, characterized in that:
the support is fixedly connected to the shell of the vertical mill.
9. The steel slag integrated efficient grinding and iron recovery system according to claim 7, characterized in that:
and the spiral mandrel of the spiral conveying mechanism is coaxial with the rotating axis of the movable scraper group.
10. The steel slag integrated efficient grinding and iron recovery system according to claim 7, characterized in that:
the spiral conveying mechanism is driven by a driving part.
CN202010945366.1A 2020-09-10 2020-09-10 Steel slag integrated efficient grinding and iron recovery system and method Active CN112169973B (en)

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