CN115232963B - Method for producing fluxed pellets from steel slag tailings - Google Patents
Method for producing fluxed pellets from steel slag tailings Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/216—Sintering; Agglomerating in rotary furnaces
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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Abstract
The invention discloses a method for producing fluxed pellets from steel slag tailings, which belongs to the technical field of steel smelting and comprises the following steps: s1: placing the steel slag tailings into a mill, and carrying out fine grinding operation on the steel slag tailings by the mill, wherein the granularity of the fine ground steel slag tailings is 200 meshes, and the proportion of the granularity of the fine ground steel slag tailings is more than or equal to 80 percent; s2: transferring the finely ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, and stirring and turning the raw materials by using mixing blades to uniformly mix the raw materials; s3: and (3) transferring the uniformly mixed raw materials into a pelletizer, supplementing water into the pelletizer, and pelletizing to produce pellets, thereby obtaining pellets with the water content of 9.6-10.2% in percentage by weight. The method for producing the fluxed pellets from the steel slag tailings is superior to the acidic pellets in the aspects of reducibility, softening, melting temperature and the like, and provides a new path for comprehensive utilization of the steel slag.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a method for producing fluxed pellets from steel slag tailings.
Background
The steel slag is a slag body formed by slag forming materials, smelting reactants, a furnace body and a furnace supplementing material which are corroded and fallen, impurities brought by metal furnace charges and slag forming materials which are specially added for adjusting the properties of the steel slag in the steel production process, and is a byproduct of the steel production process. In production, 15% -20% of steel slag is produced every 1t of steel is produced. It is counted that the coarse steel yield in 2021 reaches 10.3 hundred million t, and the metallurgical slag is produced at the same time and reaches more than 1.6 hundred million t. However, the current situation of comprehensive utilization in China is far from the planning, and especially the utilization rate of converter steel slag called inferior cement clinker is only 10% -20%.
At present, the utilization of the steel slag is mainly to recycle iron in the steel slag, the steel slag or the iron-rich steel slag is generally obtained by adopting a multi-section crushing multi-section dry magnetic separation method and is used as a raw material for steelmaking or ironmaking, most of tailings are piled and discarded, a large amount of piled and discarded tailings occupy a large amount of cultivated land, a large amount of fine particles fly to pollute air, and harmful elements and heavy metal elements in the tailings pollute the surrounding ecological environment through rain wash. Therefore, accelerating the comprehensive utilization of the deepened steel slag magnetic separation tailings (hereinafter referred to as tailings) is a problem to be solved urgently at present.
Many students have studied comprehensive utilization of tailings, jiang Xuedong and the like on the use of magnetic separation tailings for manufacturing concrete pavement bricks, ni Wen and the like on the preparation of high-strength artificial fish reef concrete from the magnetic separation tailings, sun Jigong and the like on the experimental study of building foundation transformation from steel slag magnetic separation tailings, fang Honghui and the like on the preparation of cementing materials from the tailings, yang Qi and the like on the experimental study of refractory spray coatings from the tailings. Because the components in the tailings have large complex fluctuation and contain a large amount of f-CaO and f-MgO, the materials are unstable in performance and easy to crack when being used for manufacturing roadbed materials and building materials, so that the technical difficulty for treating the tailings is high, the cost is high, and the tailings cannot be comprehensively recycled in a large amount.
When the tailings are used for replacing part of metallurgical sintering flux, the addition amount of the sintering flux such as quicklime, limestone, dolomite, fluorite and the like can be reduced, the sintering production cost is reduced, and the beneficial components such as non-magnetically selected metallic iron, feO, mgO, mnO and the like in the tailings can be recovered. Not only fully utilizes resources, but also reduces environmental pollution and reduces sintering production cost. Therefore, the use of tailings in the sintering process is an economical and efficient way of comprehensively utilizing tailings. However, there are few reports on the research of using the steel slag tailings to produce fluxed pellets, so a method for producing fluxed pellets by using the steel slag tailings is urgently needed, and a new path is provided for comprehensive utilization of the steel slag.
Disclosure of Invention
The invention aims to provide a method for producing fluxed pellets from steel slag tailings, which is superior to acidic pellets in terms of reducibility, softening, melting temperature and the like, and provides a new path for comprehensively utilizing steel slag so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a method for producing fluxed pellets from steel slag tailings comprises the following steps:
s1: placing the steel slag tailings into a mill, and carrying out fine grinding operation on the steel slag tailings by the mill, wherein the grinding time is 30-80min, and the proportion of the granularity of the fine ground steel slag tailings is 200 meshes and is more than or equal to 80 percent;
s2: transferring the finely ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, wherein the rotation speed of a mixing pot of the mixer is 600-800r/min, the rotation speed of mixing blades is 700-1200r/min, and the mixing time is 52-84min, so that the raw materials are fully mixed to be uniform;
s3: the evenly mixed raw materials are transferred into a pelletizer, the rotational speed of the pelletizer is 1400-1600r/min, water is supplemented into the pelletizer, the water content of the feed is 8-12%, pellets are produced by pelletizing, and the pellets with the water content of 9.6-10.2% in percentage by weight are obtained, wherein the average grain diameter of the pellets is 9-16mm;
S4: transferring the pellets into rotary kiln roasting equipment, roasting the pellets for 10-15min at 1300-1500 ℃, orderly distributing the pellets on the rotary kiln roasting equipment, roasting the pellets, wherein the proportion of the granularity of the fluxed pellets produced by roasting is more than or equal to 85%, and the compressive strength is more than or equal to 2000N. .
Preferably, the mill used in S1 is a ball mill.
Preferably, the components of the fluxed pellets produced by the roasting in S4 are as follows:
Fe：63-66%；SiO2：1.5-4%；CaO：0.8-1.1%；MgO：0.1-1.5%。
preferably, when the steel slag tailings, the iron powder, the limestone, the dolomite and the bentonite are mixed together, the proportion of the steel slag tailings accounts for 1-5% of the total material.
Preferably, the ball mill comprises base, rotary drum, feed end, discharge end, gyration bull gear, pinion gear, speed reducer and motor, the speed reducer with the motor is all fixed through the bolt on the base, the output of motor pass through the shaft coupling with the input shaft fixed connection of speed reducer, the output shaft of speed reducer pass through the shaft coupling with pinion gear's axis fixed connection, pinion gear's axis both sides all rotate and are connected with the gap bridge bearing seat, the feed end with the discharge end sets up respectively the left and right sides of rotary drum, the feed end with the discharge end all rotates and is connected with spacing bearing seat, spacing bearing seat is fixed on the base, gyration bull gear fixes the outside of rotary drum and be close to the position of discharge end, pinion gear with gyration bull gear meshing connection, one side of rotary drum is equipped with and is used for right the gyration bull gear with carry out the proper lubrication between the tooth face that pinion gear meshed, through the ball mill has material adaptability, crushing big, simple structure, reliable operation, and convenient to carry out long-term maintenance operation.
Preferably, the anti-wear assembly comprises a storage cylinder, a partition plate, an intermittent oil feeding assembly and an oil outlet pipeline, wherein the partition plate is arranged in the storage cylinder, the inner cavity of the storage cylinder is divided into a main oil cavity and an auxiliary oil cavity by the partition plate, an oil outlet channel communicated with the main oil cavity and the auxiliary oil cavity is formed in the partition plate, a sealing block is in sliding contact with the oil outlet channel, a piston is fixed at the top of the sealing block through a connecting rod, a plurality of through holes are formed in the piston, the piston is in sliding contact with the inner wall of the main oil cavity, a return spring is fixed between the piston and the partition plate, the intermittent oil feeding assembly is in transmission connection with the bottom of the sealing block, one end of the oil outlet pipeline is inserted in the bottom of the storage cylinder and is communicated with the inside of the auxiliary oil cavity, and the other end of the oil outlet pipeline extends to the position right above the meshing position of the rotary large gear ring and the small transmission gear.
Preferably, the intermittent oil feeding assembly comprises a reciprocating push rod, rollers, cams, a first shaft, a first bearing seat, a first fixing plate and a transmission assembly, wherein the top end of the reciprocating push rod is fixedly connected with the bottom end of the sealing block, the bottom end of the reciprocating push rod penetrates through the bottom of the storage cylinder in a sliding mode and is fixedly connected with the rollers, the cams and the rollers are in sliding fit, the first shaft is fixed in a central hole of the cams, the first bearing seat is rotationally connected to two sides of the first shaft, the first fixing plate is fixed at the bottom of the first bearing seat, a connecting frame is fixed on the outer side of the storage cylinder, the bottom end of the connecting frame is fixedly connected with the first fixing plate, and the transmission assembly is in shaft transmission connection with the speed reducer and the small transmission gear.
Preferably, the transmission assembly comprises a driving belt wheel, a synchronous belt and a driven belt wheel, wherein the driving belt wheel is fixed on a shaft between the speed reducer and the small transmission gear, the driven belt wheel is connected with the driving belt wheel in a transmission way through the synchronous belt, a transmission shaft is fixed in a middle hole of the driven belt wheel, a second bearing seat is rotationally connected to one side of the transmission shaft, one end of the second bearing seat is fixedly connected with a gap bridge bearing seat, inner splines are respectively arranged at two ends of the transmission shaft, an outer spline matched with the outer spline is arranged at one end of the first shaft, a second shaft is arranged at one side of the transmission shaft, a first bevel gear is fixed at the middle part of the second shaft, one end of the second shaft is also provided with an outer spline matched with the outer spline, three bearing seats are rotationally connected to two sides of the second shaft, a second fixing plate is fixedly arranged at the bottom of the third bearing seat, a driving assembly for clutching the first shaft and the second shaft is fixedly connected with the gap bridge bearing seat, a bevel gear assembly is arranged at the bottom of the second fixing plate, a motor is further provided with a motor, and the motor is further provided with a motor for cleaning the intermittent motor assembly by using the power, and the motor assembly can be used for cleaning the motor assembly.
Preferably, the drive assembly includes mounting panel, driving motor, two-way lead screw and screw thread piece, the mounting panel is fixed one side of speed reducer, driving motor fixes on the mounting panel, two-way lead screw pass through the shaft coupling with driving motor's output fixed connection, the screw thread piece is equipped with two, and two the screw thread piece is fixed respectively first fixed plate with the bottom of second fixed plate, two-way lead screw with screw thread piece threaded connection, the middle part of two-way lead screw is rotated and is connected with No. four bearing frames, no. four bearing frames are fixed on the mounting panel, the bottom of screw thread piece is fixed with the stopper, the inboard slip of stopper has cup jointed the gag lever post, the one end of gag lever post with No. four bearing frame's outer wall fixed connection can carry out the combination of power with intermittent type oil feeding subassembly and cleaning assembly through the drive assembly.
Preferably, the cleaning assembly comprises a second bevel gear, a third shaft, a fifth bearing seat, a third bevel gear, a fourth bevel gear, a sixth bearing seat, a fourth shaft, a driving gear, a rotary gear ring and a brush, wherein the second bevel gear is fixed at the bottom end of the third shaft, the fifth bearing seat is rotationally connected at the middle part of the third shaft, one end of the fifth bearing seat is fixedly connected with the outer side of the speed reducer, the third bevel gear is fixed at the top of the third shaft, the fourth bevel gear is meshed with the third bevel gear and connected with the driving gear and the fourth bevel gear are respectively fixed at two ends of the fourth shaft, the sixth bearing seat is rotationally connected at the outer side of the fourth shaft, the bottom of the sixth bearing seat is fixedly connected with the top of the speed reducer, the rotary gear ring is rotationally connected with the outer side of the tail end of the motor through a bearing, the brush is fixedly arranged on one side circumference of the rotary gear ring, the radius of the tail end face of the motor is equal to that of the brush, the inner side of the brush is attached to the tail end orifice of the motor, the driving gear is fixedly connected with the tail end orifice of the motor, and the tail end of the motor is rotationally fixed at the tail end of the fourth bevel gear, the fourth bevel gear is respectively at two ends of the fourth bevel gear, and the fourth bevel gear are respectively fixed at two ends of the fourth bevel gear, and the fourth bevel gear and the top and the speed reducer is fixedly connected with the top of the motor.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a method for producing fluxed pellets from steel slag tailings, which comprises the steps of putting the steel slag tailings into a ball mill, carrying out fine grinding operation on the steel slag tailings through the ball mill for 30-80min, wherein the granularity of the fine ground steel slag tailings is more than or equal to 80%, transferring the fine ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, stirring and overturning raw materials by utilizing mixing blades, fully mixing the raw materials uniformly, transferring the uniformly mixed raw materials into a pelletizer, supplementing water into the pelletizer, and pelletizing to produce pellets, wherein the average grain diameter of the pellets is 9.6-10.2%, transferring the pellets into a roasting device, orderly distributing the pellets on the rotary kiln roasting device, roasting the pellets to produce fluxed pellets, and providing a new path for comprehensively utilizing the steel slag in the aspects of reducibility, softening and melting temperature and the like.
2. The anti-abrasion component can be used for filling lubricant between gear tooth meshing surfaces of the rotary transmission part of the ball mill, preventing metal from directly contacting, reducing friction loss, radiating heat, preventing rust, improving the working condition of the rotary transmission part of the ball mill, and keeping normal operation and expected service life.
3. According to the invention, dust on the vent hole at the tail end of the motor can be cleaned through the designed cleaning component, so that a large amount of dust can be prevented from being accumulated on the dust screen at the tail end of the motor, the ventilation quantity is reduced, the heat dissipation of the motor is further influenced, and the service life of the motor is not long.
Drawings
FIG. 1 is a flow chart of a method for producing fluxed pellets from steel slag tailings according to the present invention;
FIG. 2 is a schematic diagram of the whole structure of the ball mill according to the invention;
FIG. 3 is a schematic view of a partial structure of the present invention;
FIG. 4 is a side view of the overall structure of the ball mill of the invention;
FIG. 5 is a schematic view of the wear assembly of the present invention;
FIG. 6 is a schematic view of an intermittent oil feed assembly according to the present invention;
FIG. 7 is a schematic view of a transmission assembly according to the present invention;
FIG. 8 is a schematic diagram of a driving assembly according to the present invention;
FIG. 9 is a schematic view of a cleaning assembly according to the present invention;
fig. 10 is an enlarged view of area a in fig. 7.
In the figure: 1-a base; 2-a rotary drum; 3-a feeding end; 4-a discharge end; 5-turning a large gear ring; 6-small transmission gears; 7-a speed reducer; 8-an electric motor; 9-an anti-wear assembly; 10-a storage cylinder; 11-a separator; 12-intermittent oil feed assembly; 13-an oil outlet pipeline; 14-an oil outlet channel; 15-a sealing block; 16-a piston; 17-a return spring; 18-a reciprocating push rod; 19-a roller; 20-cam; 21-a first shaft; 22-a first bearing seat; 23-a first fixing plate; 24-a transmission assembly; 25-connecting frames; 26-driving a pulley; 27-a synchronous belt; 28-driven pulleys; 29-a transmission shaft; 30-a second bearing seat; 31-internal splines; 32-external splines; 33-second axis; 34-a first bevel gear; 35-third bearing seat; 36-a second fixing plate; 37-a drive assembly; 38-cleaning assembly; 39-mounting plate; 40-driving a motor; 41-a bidirectional screw rod; 42-thread blocks; 43-fourth bearing seat; 44-limiting blocks; 45-limiting rods; 46-a second bevel gear; 47-third axis; 48-a fifth bearing seat; 49-a third bevel gear; 50-fourth bevel gear; 51-a sixth bearing seat; 52-fourth axis; 53-drive gear; 54-rotating the gear ring; 55-hairbrush.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, a method for producing fluxed pellets from steel slag tailings comprises the following steps:
s1: the steel slag tailings are put into a mill, fine grinding operation is carried out on the steel slag tailings through the mill, the grinding time is 30-80min, the granularity of the fine ground steel slag tailings is 200 meshes, the proportion is more than or equal to 80%, and the mill is a ball mill;
s2: transferring the finely ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, stirring and overturning the raw materials by using mixing blades, fully mixing the raw materials to be uniform, wherein the rotating speed of a mixing pot of the mixer is 600r/min, when the mixer is used for mixing the raw materials, the rotating speed of the mixing blades is 700r/min, the mixing time is 52min, and when the steel slag tailings, the iron powder, the limestone, the dolomite and the bentonite are mixed together, the proportion of the steel slag tailings accounts for 1-5% of the total material amount;
S3: the evenly mixed raw materials are transferred into a pelletizer, the rotational speed of the pelletizer is 1400-1600r/min, water is supplemented into the pelletizer, the water content of the feed is 8-12%, pellets are produced by pelletizing, and the pellets with the water content of 9.6-10.2% in percentage by weight are obtained, wherein the average grain diameter of the pellets is 9-16mm;
s4: transferring the pellets into rotary kiln roasting equipment, roasting the pellets for 10-15min at 1300-1500 ℃, orderly distributing the pellets on the rotary kiln roasting equipment, roasting the pellets, wherein the proportion of the granularity of the fluxed pellets produced by roasting is more than or equal to 85%, and the compressive strength is more than or equal to 2000N.
The slag is a slag body formed by slag forming materials, smelting reactants, erosion and falling furnace bodies, furnace supplementing materials, impurities brought by metal furnace charges and slag forming materials specially added for adjusting the properties of the steel slag in the steel production process, is a byproduct of the steel production process, and is formed by various oxides formed by oxidizing impurities such as silicon, manganese, phosphorus, sulfur and the like in pig iron in the smelting process and salts generated by the reaction of the oxides and solvents, wherein the main components of the steel slag tailings are shown in table 1:
table 1: typical value of slag tailing component
| TFe | CaO | MgO | SiO 2 | Al 2 0 3 | P | S | K 2 O | Na 2 O | Zn |
| 11-20 | 20-45 | 5-10 | 10-20 | 2-4 | 0.5-3 | <0.1 | <0.1 | <0.1 | <0.1 |
Iron powder is an aggregate of iron particles with a size of less than 1mm, is a main raw material for powder metallurgy, and is conventionally classified into five grades of coarse powder, medium powder, fine powder, micro-fine powder and ultrafine powder according to particle size; the iron powder with the particle composition in the range of 150-500 μm is coarse powder, the iron powder with the particle composition in the range of 44-150 μm is medium powder, the iron powder with the particle composition in the range of 10-44 μm is fine powder, the iron powder with the particle composition in the range of 0.5-10 μm is superfine powder, and the particle size is less than 0.5 μm is superfine powder. Powders that pass through a 325 mesh quasi-sieve, i.e., having a particle size less than 44 μm, are generally referred to as subsieve powders, and if a higher precision sieving is desired, only air classification equipment is used, but for some readily oxidizable iron powders only JZDF nitrogen protection classifiers are used. Iron powder mainly comprises reduced iron powder and atomized iron powder, which are named for different production modes.
Lime and limestone are a large amount of raw materials for building materials and industry, the limestone can be directly processed into stone and burned into quicklime, the quicklime CaO absorbs moisture or is added with water to form slaked lime, the slaked lime mainly comprises Ca (OH) 2 and can be called calcium hydroxide, and the slaked lime is prepared into lime slurry, lime paste and the like to be used as coating materials and tile adhesives.
The average thermal expansion coefficient of the microcrystal limestone is (4.5-5.0) multiplied by 10 < -6 >/DEG C within the range of below 800 ℃, coarse crystals are increased to 10.1 multiplied by 10 < -6 >/DEG C, the heating experiment of the limestone has important healing in lime production, the limestone crystals expand at 800 ℃ below the decomposition point of the limestone, cracks are formed in the highly crystallized limestone, and the larger crystals are broken into powder by heating, so that the limestone containing a plurality of compact calcites has serious pulverization for the limestone with good crystal development.
The chemical component of dolomite is CaMg (CO 3) 2, the crystal belongs to a trigonal carbonate mineral, the crystal structure of the dolomite is similar to that of calcite, the crystal form is rhombohedron, the crystal face is often bent into saddle shape, and the dolomite can be used as a fireproof inner layer of a converter used in steelmaking, a slag former, a cement raw material, a glass flux, kiln industry, fertilizer, stone for building and decoration, paint, insecticide, medicine and other various purposes. Can be used in the fields of building materials, ceramics, glass, refractory materials, chemical industry, agriculture, environmental protection, energy conservation and the like.
Bentonite is a nonmetallic mineral product with montmorillonite as a main mineral component, and the montmorillonite structure is 2 composed of two silicon oxygen tetrahedrons which are sandwiched by one layer of aluminum oxygen octahedrons: the type 1 crystal structure has better ion exchange property because the layered structure formed by the montmorillonite cells has certain cations, such as Cu, mg, na, K, and the cations and the montmorillonite cells have unstable action and are easy to be exchanged by other cations.
The components of the fluxed pellets produced by roasting are as follows:
Fe：63-66%；SiO2：1.5-4%；CaO：0.8-1.1%；MgO：0.1-1.5%。
the basicity and CaO and MgO components of the fluxed pellets were adjusted with limestone and dolomite to ensure the values in table 2 of fluxed pellet component loadings, which table 2 is as follows:
table 2: design value of fluxed pellet
| Fe% | SiO 2 % | CaO% | MgO% | R 2 | Particle size of 9-16mm | Compressive Strength (N/ball) |
| 63-66 | 1.5-4 | 0.8-1.1 | 0.1-1.5 | 0.7-1.3 | ≥85% | ≥2000 |
Practice proves that: the alkaline pellets are superior to the acidic pellets in terms of reducibility, softening and melting temperature, etc.
Example two
Referring to fig. 1, a method for producing fluxed pellets from steel slag tailings comprises the following steps:
s1: the steel slag tailings are put into a mill, fine grinding operation is carried out on the steel slag tailings through the mill, the grinding time is 80min, the proportion of the granularity of the fine ground steel slag tailings is 200 meshes and is more than or equal to 80%, and the mill is a high-pressure roller mill;
s2: transferring the finely ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, stirring and overturning the raw materials by using mixing blades, fully mixing the raw materials to be uniform, wherein the rotating speed of a mixing pot of the mixer is 800r/min, when the mixer is used for mixing the raw materials, the rotating speed of the mixing blades is 1200r/min, the mixing time is 84min, and when the steel slag tailings, the iron powder, the limestone, the dolomite and the bentonite are mixed together, the proportion of the steel slag tailings accounts for 1-5% of the total material amount;
S3: the evenly mixed raw materials are transferred into a pelletizer, water is added into the pelletizer, pellets are produced by pelleting, the pellets with the water content of 9.6-10.2% in percentage by weight are obtained, the average particle size of the pellets is 9-16mm, the pelleting rotating speed of the pelletizer is 1600r/min, and the water content of the feed is 12%;
s4: the pellets are transferred into rotary kiln roasting equipment, the pellets are orderly distributed on the rotary kiln roasting equipment, the pellets are roasted to produce fluxed pellets, the time for roasting the pellets by the rotary kiln roasting equipment is 15min, the roasting temperature is 1500 ℃, the proportion of the granularity of the fluxed pellets produced by roasting is 9-16mm and is more than or equal to 85%, and the compressive strength of the fluxed pellets is more than or equal to 2000N.
The components of the fluxed pellets produced by roasting are as follows:
Fe：63-66%；SiO2：1.5-4%；CaO：0.8-1.1%；MgO：0.1-1.5%。
example III
Referring to fig. 1, a method for producing fluxed pellets from steel slag tailings comprises the following steps:
s1: the steel slag tailings are put into a mill, fine grinding operation is carried out on the steel slag tailings through the mill, the grinding time is 55min, the proportion of the granularity of the fine ground steel slag tailings is 200 meshes and is more than or equal to 80%, and the mill is a high-pressure roller mill;
s2: transferring the finely ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, stirring and overturning the raw materials by using mixing blades, fully mixing the raw materials to be uniform, wherein the rotating speed of a mixing pot of the mixer is 700r/min, when the mixer is used for mixing the raw materials, the rotating speed of the mixing blades is 950r/min, the mixing time is 67min, and when the steel slag tailings, the iron powder, the limestone, the dolomite and the bentonite are mixed together, the proportion of the steel slag tailings accounts for 1-5% of the total material amount;
S3: the evenly mixed raw materials are transferred into a pelletizer, water is added into the pelletizer, pellets are produced by pelleting, the pellets with the water content of 9.6-10.2% in percentage by weight are obtained, the average particle size of the pellets is 9-16mm, the pelleting rotating speed of the pelletizer is 1500r/min, and the water content of the feed is 10%;
s4: transferring the pellets into rotary kiln roasting equipment, uniformly distributing the pellets on the rotary kiln roasting equipment, roasting the pellets to produce fluxed pellets, wherein the time for roasting the pellets by the rotary kiln roasting equipment is 13min, and the roasting temperature is 1400 ℃.
The slag is a slag body formed by slag forming materials, smelting reactants, erosion and falling furnace bodies, furnace supplementing materials, impurities brought by metal furnace charges and slag forming materials specially added for adjusting the properties of the steel slag in the steel production process, is a byproduct of the steel production process, and is formed by various oxides formed by oxidizing impurities such as silicon, manganese, phosphorus, sulfur and the like in pig iron in the smelting process and salts generated by the reaction of the oxides and solvents, wherein the main components of the steel slag tailings are shown in table 1:
table 1: typical value of slag tailing component
| TFe | CaO | MgO | SiO 2 | Al 2 0 3 | P | S | K 2 O | Na 2 O | Zn |
| 11-20 | 20-45 | 5-10 | 10-20 | 2-4 | 0.5-3 | <0.1 | <0.1 | <0.1 | <0.1 |
Iron powder is an aggregate of iron particles with a size of less than 1mm, is a main raw material for powder metallurgy, and is conventionally classified into five grades of coarse powder, medium powder, fine powder, micro-fine powder and ultrafine powder according to particle size; the iron powder with the particle composition in the range of 150-500 μm is coarse powder, the iron powder with the particle composition in the range of 44-150 μm is medium powder, the iron powder with the particle composition in the range of 10-44 μm is fine powder, the iron powder with the particle composition in the range of 0.5-10 μm is superfine powder, and the particle size is less than 0.5 μm is superfine powder. Powders that pass through a 325 mesh quasi-sieve, i.e., having a particle size less than 44 μm, are generally referred to as subsieve powders, and if a higher precision sieving is desired, only air classification equipment is used, but for some readily oxidizable iron powders only JZDF nitrogen protection classifiers are used. Iron powder mainly comprises reduced iron powder and atomized iron powder, which are named for different production modes.
Lime and limestone are a large amount of raw materials for building materials and industry, the limestone can be directly processed into stone and burned into quicklime, the quicklime CaO absorbs moisture or is added with water to form slaked lime, the slaked lime mainly comprises Ca (OH) 2 and can be called calcium hydroxide, and the slaked lime is prepared into lime slurry, lime paste and the like to be used as coating materials and tile adhesives.
The average thermal expansion coefficient of the microcrystal limestone is (4.5-5.0) multiplied by 10 < -6 >/DEG C within the range of below 800 ℃, coarse crystals are increased to 10.1 multiplied by 10 < -6 >/DEG C, the heating experiment of the limestone has important healing in lime production, the limestone crystals expand at 800 ℃ below the decomposition point of the limestone, cracks are formed in the highly crystallized limestone, and the larger crystals are broken into powder by heating, so that the limestone containing a plurality of compact calcites has serious pulverization for the limestone with good crystal development.
The chemical component of dolomite is CaMg (CO 3) 2, the crystal belongs to a trigonal carbonate mineral, the crystal structure of the dolomite is similar to that of calcite, the crystal form is rhombohedron, the crystal face is often bent into saddle shape, and the dolomite can be used as a fireproof inner layer of a converter used in steelmaking, a slag former, a cement raw material, a glass flux, kiln industry, fertilizer, stone for building and decoration, paint, insecticide, medicine and other various purposes. Can be used in the fields of building materials, ceramics, glass, refractory materials, chemical industry, agriculture, environmental protection, energy conservation and the like.
Bentonite is a nonmetallic mineral product with montmorillonite as a main mineral component, and the montmorillonite structure is 2 composed of two silicon oxygen tetrahedrons which are sandwiched by one layer of aluminum oxygen octahedrons: the type 1 crystal structure has better ion exchange property because the layered structure formed by the montmorillonite cells has certain cations, such as Cu, mg, na, K, and the cations and the montmorillonite cells have unstable action and are easy to be exchanged by other cations.
The components of the fluxed pellets produced by roasting are as follows:
Fe：63-66%；SiO2：1.5-4%；CaO：0.8-1.1%；MgO：0.1-1.5%。
the proportion of the granularity of the fluxed pellets produced by roasting is more than or equal to 85 percent, and the compressive strength of the fluxed pellets is more than or equal to 2000N.
Example IV
Referring to fig. 1, a method for producing fluxed pellets from steel slag tailings comprises the following steps:
s1: the steel slag tailings are put into a mill, fine grinding operation is carried out on the steel slag tailings through the mill, the grinding time is 42min, the proportion of the granularity of the fine ground steel slag tailings is 200 meshes and is more than or equal to 80%, and the mill is a high-pressure roller mill;
s2: transferring the finely ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, stirring and overturning the raw materials by using mixing blades, fully mixing the raw materials to be uniform, wherein the rotating speed of a mixing pot of the mixer is 640r/min, when the mixer is used for mixing the raw materials, the rotating speed of the mixing blades is 860r/min, the mixing time is 56min, and when the steel slag tailings, the iron powder, the limestone, the dolomite and the bentonite are mixed together, the proportion of the steel slag tailings accounts for 1-5% of the total material amount;
S3: the evenly mixed raw materials are transferred into a pelletizer, water is added into the pelletizer, pellets are produced by pelleting, the pellets with the water content of 9.6-10.2% in percentage by weight are obtained, the average particle size of the pellets is 9-16mm, the pelleting rotating speed of the pelletizer is 1430r/min, and the water content of the feed is 9%;
s4: transferring the pellets into rotary kiln roasting equipment, uniformly distributing the pellets on the rotary kiln roasting equipment, roasting the pellets to produce fluxed pellets, wherein the time for roasting the pellets by the rotary kiln roasting equipment is 12min, and the roasting temperature is 1350 ℃.
The components of the fluxed pellets produced by roasting are as follows:
Fe：63-66%；SiO2：1.5-4%；CaO：0.8-1.1%；MgO：0.1-1.5%。
the proportion of the granularity of the fluxed pellets produced by roasting is more than or equal to 85 percent, and the compressive strength of the fluxed pellets is more than or equal to 2000N.
Example five
Referring to fig. 1, a method for producing fluxed pellets from steel slag tailings comprises the following steps:
s1: the steel slag tailings are put into a mill, fine grinding operation is carried out on the steel slag tailings through the mill, the grinding time is 64min, the proportion of the granularity of the fine ground steel slag tailings is 200 meshes and is more than or equal to 80%, and the mill is a wet mill;
s2: transferring the finely ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, stirring and overturning the raw materials by using mixing blades, fully mixing the raw materials to be uniform, wherein the rotating speed of a mixing pot of the mixer is 730r/min, when the mixer is used for mixing the raw materials, the rotating speed of the mixing blades is 1034r/min, the mixing time is 72min, and when the steel slag tailings, the iron powder, the limestone, the dolomite and the bentonite are mixed together, the proportion of the steel slag tailings accounts for 1-5% of the total material amount;
S3: the evenly mixed raw materials are transferred into a pelletizer, water is added into the pelletizer, pellets are produced by pelleting, the pellets with the water content of 9.6-10.2% in percentage by weight are obtained, the average particle size of the pellets is 9-16mm, the pelleting rotating speed of the pelletizer is 1543r/min, and the water content of the feed is 12%;
s4: transferring the pellets into rotary kiln roasting equipment, uniformly distributing the pellets on the rotary kiln roasting equipment, roasting the pellets to produce fluxed pellets, wherein the time for roasting the pellets by the rotary kiln roasting equipment is 14min, and the roasting temperature is 1430 ℃.
The components of the fluxed pellets produced by roasting are as follows:
Fe：63-66%；SiO2：1.5-4%；CaO：0.8-1.1%；MgO：0.1-1.5%。
the proportion of the granularity of the fluxed pellets produced by roasting is more than or equal to 85 percent, and the compressive strength of the fluxed pellets is more than or equal to 2000N.
Comparative example
The acid pellet ore is produced by adopting the prior art.
After the fluxed pellets are produced by adopting the method for producing the fluxed pellets by adopting the steel slag tailings, detecting each performance of the fluxed pellets, wherein the detection conditions are as follows:
1. fluxed pellet reducibility detection
Preparing a fluxed pellet sample, wherein the fluxed pellet sample is reduced under the conditions that the reduction temperature is 500 ℃ +/-10 ℃, the reduction time is 60min, the reduction gas comprises 20% of CO, 220% of CO and 260% of N, the concentration of H2 is less than 0.2%, the fluxed pellet sample after reduction is cooled by introducing N2, then the fluxed pellet sample is fully loaded into a small rotary drum (phi 130mm multiplied by 200 mm), the rotary drum is rotated for 10min at the rotating speed of 30r/min, the rotary drum sample is screened, and the percentage of the mass of +6.3mm, +3.15mm, -0.5mm particle size fraction to the total mass of the sample after reduction is used as the reduction pulverization index.
2. Detection of softening temperature of fluxed pellets
Loading flux pellets with qualified granularity into a crucible, compacting by a standard method, taking a silicon carbide rod with the diameter of 50mm as a compression rod, taking the load of 2 kg/cm < 2 >, heating a sample to 800 ℃ under the condition of introducing nitrogen, slowly heating, starting to reach 1350 ℃ at the temperature of 5 ℃ per minute, reducing the temperature rising speed to 0.5 ℃ per minute, and observing the softening temperature of the flux pellets.
3. Detection of melting temperature of fluxed pellets
Loading flux pellets with qualified granularity into a crucible, compacting by a standard method, taking a silicon carbide rod with the diameter of 50mm as a compression rod, taking the load of 2 kg/cm < 2 >, heating a sample to 800 ℃ under the condition of introducing nitrogen, slowly heating, starting to reach 1350 ℃ at the temperature of 5 ℃ per minute, reducing the temperature rising speed to 0.5 ℃ per minute, and observing the melting temperature of the flux pellets.
After the reducibility, softening temperature and melting temperature of the fluxed pellets were measured, the measurement conditions are shown in table 3, and table 3 is as follows:
table 3: fluxed pellet property detection
| Reduction of the degradation index RDI | Softening temperature | Melting temperature | |
| Example 1 | 34% | 1167℃ | 1192℃ |
| Example two | 33% | 1173℃ | 1197℃ |
| Example III | 38% | 1123℃ | 1164℃ |
| Example IV | 35% | 1158℃ | 1184℃ |
| Example five | 36% | 1136℃ | 1173℃ |
| Comparative example | 23% | 1123℃ | 1123℃ |
As is clear from Table 3, the basic pellets were superior to the acidic pellets in terms of reducibility, softening and melting temperature.
In summary, the method for producing fluxed pellets from the steel slag tailings is characterized in that the steel slag tailings are placed into a mill, the fine grinding operation is carried out on the steel slag tailings through the mill for 30-80min, the granularity of the fine ground steel slag tailings is more than or equal to 80% in proportion to 200 meshes, the fine ground steel slag tailings are transferred into a mixer, iron powder, limestone, dolomite and bentonite are added into the mixer, the raw materials are fully and uniformly mixed by utilizing mixing blades, the raw materials are transferred into a pelletizer, water is supplemented into the pelletizer, pellets with the water content of 9.6-10.2% in percentage by weight are produced, the average grain size of the pellets is 9-16mm, the pellets are transferred into rotary kiln roasting equipment, the pellets are orderly distributed on the rotary kiln roasting equipment, and are roasted, and the fluxed pellets produced by the method are superior to acidic pellets in reducing property, softening and melting temperature and the like, and a new path is provided for comprehensively utilizing the steel slag.
As shown in fig. 2 and 3, in order to improve the efficiency of fine grinding operation on the steel slag tailings, the ball mill is composed of a base 1, a rotary drum 2, a feed end 3, a discharge end 4, a rotary large gear ring 5, a small transmission gear 6, a speed reducer 7 and a motor 8, wherein the speed reducer 7 and the motor 8 are fixed on the base 1 through bolts, an output end of the motor 8 is fixedly connected with an input shaft of the speed reducer 7 through a shaft coupling, an output shaft of the speed reducer 7 is fixedly connected with a middle shaft of the small transmission gear 6 through the shaft coupling, two sides of the middle shaft of the small transmission gear 6 are respectively and rotatably connected with a bridge bearing seat, the feed end 3 and the discharge end 4 are respectively arranged at the left end and the right end of the rotary drum 2, the feed end 3 and the discharge end 4 are respectively and rotatably connected with limit bearing seats, the limit bearing seats are fixed on the base 1, the rotary large gear ring 5 is fixed at the outer side of the rotary drum 2 and near the discharge end 4, one side of the rotary drum 2 is provided with a tooth surface component 9 for properly lubricating the tooth surfaces of the rotary large gear ring 5 and the small transmission gear 6, and the tooth surface component meshed with the small transmission gear 6 is arranged on one side of the rotary drum 2.
In addition, as shown in fig. 4-6, in order to fill lubricant between gear tooth engagement surfaces of a rotary transmission part of the ball mill, the anti-wear assembly 9 comprises a storage cylinder 10, a partition plate 11, an intermittent oil feeding assembly 12 and an oil outlet pipeline 13, wherein the partition plate 11 is arranged in the storage cylinder 10, the storage cylinder 10 is made of transparent plastic materials, an inner cavity of the storage cylinder 10 is divided into a main oil cavity and an auxiliary oil cavity by the partition plate 11, an oil outlet channel 14 communicated with the main oil cavity and the auxiliary oil cavity is formed in the partition plate 11, a sealing block 15 is in sliding contact with the oil outlet channel 14, a piston 16 is fixed on the top of the sealing block 15 through a connecting rod, a plurality of through holes are formed in the piston 16, the piston 16 is in sliding contact with the inner wall of the main oil cavity, a return spring 17 is fixed between the piston 16 and the partition plate 11, the intermittent oil feeding assembly 12 is in transmission connection with the bottom of the sealing block 15, one end of the oil outlet pipeline 13 is inserted in the bottom of the storage cylinder 10 and is communicated with the inside the auxiliary oil cavity, and the other end of the oil outlet pipeline 13 extends to a position right above the engagement position of the rotary large gear ring 5 and the small transmission gear 6.
Meanwhile, as shown in fig. 4 and 5, in order to facilitate the supply of the lubricant, the intermittent oil feeding assembly 12 includes a reciprocating push rod 18, a roller 19, a cam 20, a first shaft 21, a first bearing seat 22, a first fixing plate 23 and a transmission assembly 24, the top end of the reciprocating push rod 18 is fixedly connected with the bottom end of the sealing block 15, the bottom end of the reciprocating push rod 18 slidably penetrates through the bottom of the storage cylinder 10 and is fixedly connected with the roller 19, the cam 20 is slidably matched with the roller 19, the first shaft 21 is fixed in a central hole of the cam 20, the first bearing seat 22 is rotatably connected to both sides of the first shaft 21, the first fixing plate 23 is fixed at the bottom of the first bearing seat 22, a connecting frame 25 is fixed at the outer side of the storage cylinder 10, the bottom end of the connecting frame 25 is fixedly connected with the first fixing plate 23, and the transmission assembly 24 is in shaft transmission connection with the speed reducer 7 and the pinion 6.
In addition, as shown in fig. 3 and 7-10, in order to utilize the motor 8 of the ball mill to provide power for the intermittent oil feeding assembly 12, the transmission assembly 24 comprises a driving belt pulley 26, a synchronous belt 27 and a driven belt pulley 28, the driving belt pulley 26 is fixed on a shaft between the speed reducer 7 and the small transmission gear 6, the driven belt pulley 28 is in transmission connection with the driving belt pulley 26 through the synchronous belt 27, a transmission shaft 29 is fixed in a middle hole of the driven belt pulley 28, one side of the transmission shaft 29 is rotatably connected with a second bearing seat 30, one end of the second bearing seat 30 is fixedly connected with a gap bridge bearing seat, both ends of the transmission shaft 29 are provided with internal splines 31, one end of the first shaft 21 is provided with external splines 32 matched with the external splines 32, one side of the transmission shaft 29 away from the first shaft 21 is provided with a second shaft 33, the middle part of the second shaft 33 is fixedly provided with a first bevel gear 34, one end of the second shaft 33 away from the speed reducer 7 is also provided with external splines 32 matched with the external splines 32, both sides of the second shaft 33 are rotatably connected with a third bearing seat 35, the bottom of the third bearing seat 35 is fixedly provided with a second fixing plate 36, the bottom of the second fixing plate 36 is provided with a vent hole for cleaning the first bevel gear 34 and the first bevel gear assembly 8 on the first bevel gear assembly is further provided with the tail end of the first bevel gear assembly 37.
Meanwhile, as shown in fig. 8, in order to combine the intermittent oil feeding assembly 12 and the cleaning assembly 38 in power, the driving assembly 37 comprises a mounting plate 39, a driving motor 40, a bidirectional screw rod 41 and a threaded block 42, wherein the mounting plate 39 is fixed on one side of the speed reducer 7, the driving motor 40 is fixed on the mounting plate 39, the bidirectional screw rod 41 is fixedly connected with the output end of the driving motor 40 through a coupler, the threaded block 42 is provided with two, the bottoms of the first fixing plate 23 and the second fixing plate 36 are respectively fixed on the two threaded blocks 42, the bidirectional screw rod 41 is in threaded connection with the threaded block 42, a fourth bearing seat 43 is rotationally connected with the middle part of the bidirectional screw rod 41, the fourth bearing seat 43 is fixed on the mounting plate 39, a limiting block 44 is fixed on the bottom of the threaded block 42, a limiting rod 45 is sleeved on the inner side of the limiting block 44 in a sliding manner, and one end of the limiting rod 45 is fixedly connected with the outer wall of the fourth bearing seat 43.
When properly lubricating the tooth surfaces of the rotary large ring gear 5 and the small transmission gear 6, the following steps are performed: firstly, the driving motor 40 is started to work, the driving motor 40 drives the bidirectional screw rod 41 to rotate, the bidirectional screw rod 41 drives the two thread blocks 42 to move close to each other, the first shaft 21 and the second shaft 33 on the first fixing plate 23 and the second fixing plate 36 slide to enter the two ends of the transmission shaft 29, the motor 8 can be started to work at the moment, the motor 8 transmits power to the speed reducer 7 to enable the shaft between the speed reducer 7 and the small transmission gear 6 to rotate, thereby driving the driving belt pulley 26 to rotate, the driving belt pulley 26 drives the driven belt pulley 28 to rotate through the synchronous belt 27, the driven belt pulley 28 drives the transmission shaft 29 to rotate, the transmission shaft 29 drives the first shaft 21 to rotate, the first shaft 21 drives the cam 20 to rotate, the cam 20 and the idler wheel 19 are matched, the reciprocating push rod 18 connected with the idler wheel 19 can reciprocate up and down, the sealing block 15 can be driven to reciprocate up and down, the intermittent opening and closing of the oil outlet channel 14 is carried out, lubricant in the main oil cavity can flow into the auxiliary oil cavity 13 and flow out from the auxiliary oil cavity, the lubricant continuously drops to the ball mill 5 and the small transmission gear 6, the friction is prevented from continuously from dropping to the gear face between the ball mill and the tooth face, the automatic transmission assembly is not required to be in contact with the friction between the ball mill and the ball mill, the friction assembly is prevented, the friction loss can be reduced, the friction loss can be prevented, the ball mill assembly can be directly run, and the friction loss can be prevented, and the friction loss can be directly caused, and the friction loss can be prevented, and the friction loss can be caused, and the friction can be prevented.
In addition, as shown in fig. 9, the cleaning assembly 38 includes a second bevel gear 46, a third shaft 47, a fifth bearing seat 48, a third bevel gear 49, a fourth bevel gear 50, a sixth bearing seat 51, a fourth shaft 52, a driving gear 53, a rotary gear ring 54 and a brush 55, the second bevel gear 46 is fixed at the bottom end of the third shaft 47, the fifth bearing seat 48 is rotationally connected at the middle part of the third shaft 47, one end of the fifth bearing seat 48 is fixedly connected with the outside of the speed reducer 7, the third bevel gear 49 is fixed at the top of the third shaft 47, the fourth bevel gear 50 is in meshed connection with the third bevel gear 49, the driving gear 53 and the fourth bevel gear 50 are respectively fixed at two ends of the fourth shaft 52, the sixth bearing seat 51 is rotationally connected at the outside of the fourth shaft 52, and the bottom of the speed reducer 7 is fixedly connected with the top of the speed reducer 8, the rotary gear ring 54 is rotationally connected with the outside of the tail end of the motor 8 through a bearing, the brush 55 is rotationally fixed on one side circumference of the rotary gear ring 54 through a bolt, the inside of the brush 55 is meshed with the tail end vent of the motor 8, the driving gear 53 is meshed with the tail end vent of the rotary gear ring 54, the tail end 8 of the motor 8, the tail end 55 and the tail end 8 of the motor 8 are radially equal to the tail end 8 of the motor 8, the tail end 8 can not have a great influence on the dust and dust can be accumulated on the tail end 8.
When cleaning dust on the vent hole at the tail end of the motor 8: firstly, the driving motor 40 is started to work, the driving motor 40 drives the bidirectional screw 41 to rotate, the bidirectional screw 41 drives the two threaded blocks 42 to move close to each other, the first shaft 21 and the second shaft 33 on the first fixing plate 23 and the second fixing plate 36 slide to enter two ends of the transmission shaft 29, at this time, the first bevel gear 34 on the second shaft 33 is meshed with the second bevel gear 46, the motor 8 is started to work, the motor 8 transmits power to the speed reducer 7 to enable a shaft between the speed reducer 7 and the small transmission gear 6 to rotate, thereby driving the driving belt pulley 26 to rotate, the driving belt pulley 26 drives the driven belt pulley 28 to rotate through the synchronous belt 27, the driven belt pulley 28 drives the transmission shaft 29 to rotate, the transmission shaft 29 drives the second shaft 33 to rotate, the second shaft 33 drives the first bevel gear 34 to rotate, the first bevel gear 34 drives the second bevel gear 46 to rotate, the second bevel gear 46 drives the third shaft 47 to rotate, the third bevel gear 49 rotates, the third bevel gear 49 drives the fourth bevel gear 50 to rotate, the fourth shaft 52 drives the bevel gear 53 to rotate, the driving gear 53 rotates, the driving gear 53 drives the rotating the tail gear 54 to rotate, finally the tail gear 54 rotates the tail gear 8 to rotate, the tail end of the tail gear 8 is driven by the motor to rotate, dust can not accumulate, and the dust can not accumulate on the motor 8 is prevented from being a circle center, and the dust can be accumulated on the tail end surface is prevented, and dust can be accumulated on the motor 8 has a long dust-proof effect.
In summary, by means of the designed wear protection assembly 9, not only can lubricant be filled between the gear tooth engagement surfaces of the rotary transmission part of the ball mill, but also dust on the tail end vent hole of the motor 8 can be cleaned during lubrication.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Claims (3)
1. The method for producing the fluxed pellets from the steel slag tailings is characterized by comprising the following steps of:
s1: placing the steel slag tailings into a mill, and carrying out fine grinding operation on the steel slag tailings by the mill, wherein the grinding time is 30-80min, and the proportion of the granularity of the fine ground steel slag tailings is 200 meshes and is more than or equal to 80 percent;
S2: transferring the finely ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, wherein the rotation speed of a mixing pot of the mixer is 600-800r/min, the rotation speed of mixing blades is 700-1200r/min, and the mixing time is 52-84min, so that the raw materials are fully mixed to be uniform;
s3: the evenly mixed raw materials are transferred into a pelletizer, the rotational speed of the pelletizer is 1400-1600r/min, water is supplemented into the pelletizer, the water content of the feed is 8-12%, pellets are produced by pelletizing, and the pellets with the water content of 9.6-10.2% in percentage by weight are obtained, wherein the average grain diameter of the pellets is 9-16mm;
s4: transferring the pellets into rotary kiln roasting equipment, roasting the pellets for 10-15min at 1300-1500 ℃, orderly distributing the pellets on the rotary kiln roasting equipment, roasting the pellets, wherein the proportion of the granularity of the fluxed pellets produced by roasting is more than or equal to 85%, and the compressive strength is more than or equal to 2000N;
the grinding machine adopted in the S1 is a ball mill, the ball mill is composed of a base (1), a rotary cylinder (2), a feeding end (3), a discharging end (4), a rotary large gear ring (5), a small transmission gear (6), a speed reducer (7) and a motor (8), the speed reducer (7) and the motor (8) are all fixed on the base (1) through bolts, the output end of the motor (8) is fixedly connected with an input shaft of the speed reducer (7) through a coupling, an output shaft of the speed reducer (7) is fixedly connected with a central shaft of the small transmission gear (6) through the coupling, two sides of the central shaft of the small transmission gear (6) are respectively and rotatably connected with a gap bridge bearing seat, the feeding end (3) and the discharging end (4) are respectively arranged at the left end and the right end of the rotary cylinder (2), the feeding end (3) and the discharging end (4) are respectively and rotatably connected with a limit bearing seat, the limit bearing seat is fixed on the base (1), the large rotary gear ring (5) is fixed on the outer side of the rotary cylinder (2) and is close to the small transmission gear ring (6), an anti-wear assembly (9) is arranged on one side of the rotary cylinder (2) and used for properly lubricating tooth surfaces meshed with the rotary large gear ring (5) and the small transmission gear (6);
The anti-wear assembly (9) comprises a storage cylinder (10), a partition plate (11), an intermittent oil feeding assembly (12) and an oil outlet pipeline (13), wherein the partition plate (11) is arranged in the storage cylinder (10), an inner cavity of the storage cylinder (10) is divided into a main oil cavity and an auxiliary oil cavity by the partition plate (11), an oil outlet channel (14) communicated with the main oil cavity and the auxiliary oil cavity is formed in the partition plate (11), a sealing block (15) is in sliding contact with the oil outlet channel (14), a piston (16) is fixed at the top of the sealing block (15) through a connecting rod, a plurality of through holes are formed in the piston (16), the piston (16) is in sliding contact with the inner wall of the main oil cavity, a return spring (17) is fixed between the piston (16) and the partition plate (11), one end of the intermittent oil feeding assembly (12) is in transmission connection with the bottom of the sealing block (15), one end of the oil outlet pipeline (13) is inserted into the bottom of the storage cylinder (10) and is in sliding contact with the auxiliary oil cavity, and is communicated with the inner part of the auxiliary oil cavity, and the other end of the oil outlet channel is meshed with a large gear (6) and a small gear (6) is meshed with the small gear (6);
the intermittent oil feeding assembly (12) comprises a reciprocating push rod (18), a roller (19), a cam (20), a first shaft (21), a first bearing seat (22), a first fixing plate (23) and a transmission assembly (24), wherein the top end of the reciprocating push rod (18) is fixedly connected with the bottom end of the sealing block (15), the bottom end of the reciprocating push rod (18) penetrates through the bottom of the storage cylinder (10) in a sliding manner and is fixedly connected with the roller (19), the cam (20) is in sliding fit with the roller (19), the first shaft (21) is fixed in a central hole of the cam (20), the first bearing seat (22) is rotationally connected to two sides of the first shaft (21), the first fixing plate (23) is fixed at the bottom of the first bearing seat (22), a connecting frame (25) is fixed on the outer side of the storage cylinder (10), the bottom end of the connecting frame (25) is fixedly connected with the first fixing plate (23), and the transmission assembly (24) is connected with a transmission shaft between the speed reducer (7) and the transmission pinion (6).
The transmission assembly (24) comprises a driving belt wheel (26), a synchronous belt (27) and a driven belt wheel (28), wherein the driving belt wheel (26) is fixed on a shaft between the speed reducer (7) and the small transmission gear (6), the driven belt wheel (28) is in transmission connection with the driving belt wheel (26) through the synchronous belt (27), a transmission shaft (29) is fixed in a middle hole of the driven belt wheel (28), one side of the transmission shaft (29) is rotationally connected with a second bearing seat (30), one end of the second bearing seat (30) is fixedly connected with a gap bridge bearing seat, two ends of the transmission shaft (29) are respectively provided with an internal spline (31), one end of the first shaft (21) is provided with an external spline (32) matched with the internal spline (31), one side of the transmission shaft (29) away from the first shaft (21) is provided with a second shaft (33), the middle part of the second shaft (33) is fixedly provided with a first bevel gear (34), one end of the second shaft (33) away from the speed reducer (7) is also provided with a third bearing seat (35) which is fixedly connected with a third spline (35), the bottom of the second fixing plate (36) is provided with a driving assembly (37) for clutching the first shaft (21) and the second shaft (33), and a cleaning assembly (38) for cleaning dust on a vent hole at the tail end of the motor (8) is further arranged above the first bevel gear (34);
The driving assembly (37) comprises a mounting plate (39), a driving motor (40), a bidirectional screw rod (41) and threaded blocks (42), wherein the mounting plate (39) is fixed on one side of the speed reducer (7), the driving motor (40) is fixed on the mounting plate (39), the bidirectional screw rod (41) is fixedly connected with the output end of the driving motor (40) through a coupler, the threaded blocks (42) are provided with two, the two threaded blocks (42) are respectively fixed on the bottoms of the first fixing plate (23) and the second fixing plate (36), the bidirectional screw rod (41) is in threaded connection with the threaded blocks (42), a fourth bearing seat (43) is rotationally connected in the middle of the bidirectional screw rod (41), a limiting block (44) is fixed on the mounting plate (39), the inner side of the limiting block (44) is sleeved with a limiting rod (45) in a sliding manner, and one end of the limiting rod (45) is fixedly connected with the outer wall of the fourth bearing seat (43);
the cleaning component (38) comprises a second bevel gear (46), a third shaft (47), a fifth bearing seat (48), a third bevel gear (49), a fourth bevel gear (50), a sixth bearing seat (51), a fourth shaft (52), a driving gear (53), a rotary gear ring (54) and a brush (55), wherein the second bevel gear (46) is fixed at the bottom end of the third shaft (47), the fifth bearing seat (48) is rotationally connected to the middle part of the third shaft (47), one end of the fifth bearing seat (48) is fixedly connected with the outer side of the speed reducer (7), the third bevel gear (49) is fixedly connected to the top of the third shaft (47), the fourth bevel gear (50) is meshed with the third bevel gear (49), the driving gear (53) and the fourth bevel gear (50) are respectively fixed at two ends of the fourth shaft (52), the sixth bearing seat (51) is rotationally connected to the outer side of the fourth shaft (52), the bottom of the fifth bearing seat (48) is rotationally connected to the top of the speed reducer (7) and rotationally connected to the outer side of the brush (54) through a rotary bearing (55) on one side of the rotary gear ring (8), the inner side of the brush (55) is attached to a tail end vent hole of the motor (8), the driving gear (53) is meshed with the rotary gear ring (54), and the radius of the brush (55) is equal to that of the tail end surface of the motor (8).
2. The method for producing fluxed pellets from steel slag tailings according to claim 1, wherein the method comprises the steps of: the components of the fluxed pellets produced by roasting in the step S4 are as follows:
Fe：63-66%；SiO2：1.5-4%；CaO：0.8-1.1%；MgO：0.1-1.5%。
3. the method for producing fluxed pellets from steel slag tailings according to claim 1, wherein the method comprises the steps of: when the steel slag tailings, the iron powder, the limestone, the dolomite and the bentonite are mixed together, the proportion of the steel slag tailings accounts for 1-5% of the total material.
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