CN115232963A - Method for producing fluxed pellets from steel slag tailings - Google Patents

Method for producing fluxed pellets from steel slag tailings Download PDF

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Publication number
CN115232963A
CN115232963A CN202210906944.XA CN202210906944A CN115232963A CN 115232963 A CN115232963 A CN 115232963A CN 202210906944 A CN202210906944 A CN 202210906944A CN 115232963 A CN115232963 A CN 115232963A
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shaft
steel slag
pellets
fixed
slag tailings
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CN115232963B (en
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于原浩
刘力永
吴香春
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Jiangsu Binxin Steel Group Co Ltd
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Jiangsu Binxin Steel Group Co Ltd
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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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention discloses a method for producing fluxed pellets by using steel slag tailings, which belongs to the technical field of steel smelting and comprises the following steps: s1: putting the steel slag tailings into a grinder, and carrying out fine grinding operation on the steel slag tailings through the grinder, wherein the proportion of the granularity of the steel slag tailings after fine grinding to be 200 meshes is more than or equal to 80%; 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 over the raw materials by using a mixing blade to uniformly mix the raw materials; s3: and transferring the uniformly mixed raw materials into a pelletizer, supplementing water into the pelletizer, pelletizing to produce pellets, and obtaining the pellets with the water content of 9.6-10.2% in percentage by weight. The method for producing the fluxed pellets by the steel slag tailings, disclosed by the invention, has the advantages that the fluxed pellets produced by the method are superior to the acid pellets in the aspects of reducibility, softening, melting temperature and the like, and a new path is provided for comprehensive utilization of the steel slag.

Description

Method for producing fluxed pellets from steel slag tailings
Technical Field
The invention relates to the technical field of steel smelting, in particular to a method for producing fluxed pellets by using steel slag tailings.
Background
The steel slag is a slag body which consists of slag-forming materials, smelting reactants, furnace bodies and fettling materials which are corroded and shed, impurities brought by metal furnace burden 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 in the steel production process. In production, 15% -20% of steel slag is generated every 1t of steel is produced. According to statistics, the yield of crude steel in China reaches 10.3 hundred million t in 2021 year, and the yield of the produced metallurgical slag reaches more than 1.6 hundred million t. However, the current situation of the current comprehensive utilization in China is far from the planning, and the utilization rate of the converter steel slag is only 10% -20%.
At present, the steel slag is mainly used for recovering iron in the steel slag, a multi-section crushing and multi-section dry magnetic separation method is generally adopted to obtain slag steel or iron-rich steel slag as a raw material for steel making or iron making, most of tailings are piled, a large amount of piled tailings not only occupy a large amount of cultivated land, but also pollute air due to flying of a large amount of fine particles, and harmful elements and heavy metal elements in the tailings pollute the surrounding ecological environment due to rain wash. Therefore, accelerating the comprehensive utilization of the magnetic separation tailings (hereinafter referred to as tailings) of the deepened steel slag is a problem to be solved at present.
Many scholars have studied the comprehensive utilization of tailings, the ginger scholars and the like have studied the magnetic separation tailings for manufacturing concrete pavement bricks, the Niwen and the like have studied the magnetic separation tailings for preparing high-strength artificial fish reef concrete, the Sunzhong and the like have developed the experimental study of the steel slag magnetic separation tailings for manufacturing building foundation, the Fanghou and the like have studied the tailings for preparing cementing materials, and the Yangtao and the like have carried out the experimental study of the tailings for preparing refractory spray coating materials. The tailings have large complex fluctuation of components and contain a large amount of f-CaO and f-MgO, so that the tailings are unstable in material performance and easy to crack when used for manufacturing roadbed materials and building materials, the technical difficulty of treating the tailings is high, the cost is high, and the tailings cannot be comprehensively recycled in a large amount.
The tailings contain high content of basic oxides such as calcium oxide, magnesium oxide and the like, when partial metallurgy sintering flux is replaced by the tailings, the addition amount of the sintering flux such as quick lime, limestone, dolomite, fluorite and the like can be reduced, the sintering production cost is reduced, and the non-magnetically-separated metal iron, feO, mgO, mnO and other beneficial components in the tailings can be recovered. Not only fully utilizes resources, but also lightens environmental pollution and reduces sintering production cost. Therefore, the tailings are used for the sintering process, and an economic and effective way for comprehensively utilizing the tailings is provided. However, there are few reports on the research of using steel slag tailings to produce the fluxing pellet, so that a method for producing the fluxing pellet by using the steel slag tailings is urgently needed, and a new path is provided for the 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 acid pellets in the aspects of reducibility, softening, melting temperature and the like, provides a new path for comprehensive utilization of steel slag, and solves the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for producing fluxed pellets by steel slag tailings comprises the following steps:
s1: putting the steel slag tailings into a grinder, and carrying out fine grinding operation on the steel slag tailings by the grinder, wherein the grinding time is 30-80min, and the proportion of the granularity of the steel slag tailings after fine grinding, which is 200 meshes, is more than or equal to 80%;
s2: transferring the finely ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, wherein the rotating speed of a mixing pot of the mixer is 600-800r/min, the rotating speed of mixing blades of the mixer is 700-1200r/min, and the mixing time is 52-84min, so that the raw materials are fully mixed to be uniform;
s3: transferring the uniformly mixed raw materials into a pelletizer, wherein the rotation speed of the pelletizer is 1400-1600r/min, supplementing water into the pelletizer, the water content of the fed material is 8-12%, pelletizing to produce pellets, and obtaining pellets with the water content of 9.6-10.2% in percentage by weight, wherein the average particle size of the pellets is 9-16mm;
s4: and transferring the pellets into rotary kiln roasting equipment, wherein the time for roasting the pellets by the rotary kiln roasting equipment is 10-15min, the roasting temperature is 1300-1500 ℃, the pellets are regularly distributed on the rotary kiln roasting equipment, the pellets are roasted, the proportion of the fluxed pellets produced by roasting, the granularity of 9-16mm 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 composition of the fluxed pellets produced by roasting in S4 is 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 amount.
Preferably, the ball mill comprises base, revolving drum, feed end, discharge end, gyration bull gear, little drive gear, speed reducer and motor, the speed reducer with the motor all passes through the bolt fastening 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 the axis fixed connection of little drive gear, the axis both sides of little drive gear all rotate and are connected with the gap bridge bearing frame, the feed end with the discharge end sets up respectively both ends about the revolving drum, the feed end with the discharge end all rotates and is connected with spacing bearing frame, spacing bearing frame is fixed on the base, gyration bull gear is fixed the outside of revolving drum and be close to the position of discharge end, little drive gear with gyration bull gear meshes the connection, one side of revolving drum is equipped with and is used for carrying out the abrasionproof subassembly that suitably lubricates between the tooth face that gyration bull gear and little drive gear mesh, has material, crushing than big, simple structure, firm, operation through the ball mill, and convenient maintenance management, can carry out the long-term operation tail sediment advantage of long-term operation by the strong adaptability to steel slag.
Preferably, the abrasionproof decreases the subassembly and includes storage cylinder, baffle, intermittent type nature oil feeding subassembly and oil outlet pipe way, the baffle is established the inside of storage cylinder, the baffle will the inner chamber of storage cylinder divide into main oil pocket and vice oil pocket two parts, set up the oil outlet channel that is linked together with main oil pocket and vice oil pocket on the baffle, sliding contact has the seal block in the oil outlet channel, the top of seal block is fixed with the piston through the connecting rod, seted up a plurality of through-holes on the piston, the inner wall sliding contact of piston and main oil pocket, the piston with be fixed with return spring between the baffle, the intermittent type nature oil feeding subassembly with the bottom transmission of seal block is connected, oil outlet pipe's one end is inserted the bottom of storage cylinder and is communicate with the inside of vice oil pocket, oil outlet pipe's the other end extends to gyration big ring gear with little drive gear mesh position directly over, can prevent through the meshing face interval of the gyration transmission portion of ball mill from injecting the emollient, can prevent metal direct contact, reduce friction loss, can also dispel the heat and rust-resistant and rust.
Preferably, the intermittent type nature oil feeding assembly includes reciprocal push rod, gyro wheel, cam, primary shaft, bearing frame, first fixed plate and drive assembly, the top of reciprocal push rod with the bottom fixed connection of sealed piece, the bottom of reciprocal push rod slides and runs through the bottom of storage cylinder and with gyro wheel fixed connection, the cam with gyro wheel sliding fit, the primary shaft is fixed in the centre bore of cam, the both sides of primary shaft are all rotated and are connected with the bearing frame No. one, first fixed plate is fixed the bottom of bearing frame, the outside of storage cylinder is fixed with the link, the bottom of link with first fixed plate fixed connection, drive assembly with the speed reducer with shaft drive between the little drive gear is connected, can conveniently supply with emollient through the intermittent type nature oil feeding assembly.
Preferably, the transmission assembly comprises a driving belt pulley, a synchronous belt and a driven belt pulley, the driving belt pulley is fixed on a shaft between the speed reducer and the small transmission gear, the driven belt pulley is in transmission connection with the driving belt pulley through the synchronous belt, a transmission shaft is fixed in a middle hole of the driven belt pulley, one side of the transmission shaft is rotatably connected with a second bearing seat, one end of the second bearing seat is fixedly connected with a gap bridge bearing seat, inner splines are 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, far away from the first shaft, of the transmission shaft, a first bevel gear is fixed in the middle of the second shaft, an outer spline matched with the outer spline is also arranged at one end, far away from the speed reducer, three bearing seats are rotatably connected at two sides of the second shaft, a second fixing plate is fixed at the bottom of the third bearing seat, a driving assembly for engaging and disengaging the first shaft and the second shaft is arranged at the bottom of the second fixing plate, a cleaning assembly for cleaning dust at the tail end of the motor is further arranged above the first bevel gear, and the ball mill can supply intermittent power to the motor assembly.
Preferably, drive assembly includes mounting panel, driving motor, two-way lead screw and 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 thread piece is equipped with two, and two the thread piece is fixed respectively first fixed plate with the bottom of second fixed plate, two-way lead screw with 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 thread piece is fixed with the stopper, the gag lever post has been cup jointed in the inboard slip of stopper, the one end of gag lever post with No. four outer wall fixed connection of bearing frame can carry out the combination of power with intermittent type nature oil feeding component and clean subassembly through 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 rotating gear ring and a brush, the second bevel gear is fixed at the bottom end of the third shaft, the fifth bearing seat is rotatably connected to the middle of the third shaft, one end of the fifth bearing seat is fixedly connected to the outer side of the speed reducer, the third bevel gear is fixed to the top of the third shaft, the fourth bevel gear is connected to the third bevel gear in a meshing manner, the driving gear and the fourth bevel gear are respectively fixed to two ends of the fourth shaft, the sixth bearing seat is rotatably connected to the outer side of the fourth shaft, the bottom of the sixth bearing seat is fixedly connected to the top of the speed reducer, the rotating gear ring is rotatably connected to the outer side of the tail end of the motor through a bearing, the brush is fixed to the circumference of one side of the rotating gear ring through a bolt, the brush is equal to the radius of the tail end face of the motor, the inner side of the brush is attached to the vent hole of the tail end of the motor, the driving gear is engaged with the rotating gear ring, dust on the tail end of the cleaning assembly can be cleaned, dust on the vent hole of the motor, and the dust collector can be prevented from being attached to the dust collector, and further cause the dust collector to reduce the life 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 by using 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 by using the ball mill, wherein the grinding time is 30-80min, the proportion of the granularity of the finely ground steel slag tailings to be 200 meshes is more than or equal to 80%, transferring the finely ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, stirring and turning the raw materials by using a mixing blade to fully mix the raw materials to be uniform, transferring the uniformly mixed raw materials into a pelletizer, supplementing water into the pelletizer, pelletizing to produce pellets, obtaining pellets with the water content of 9.6-10.2% in percentage by weight, transferring the pellets into a rotary kiln roasting device, and roasting the pellets on the rotary kiln roasting device in order to roast the pellets to produce the fluxed pellets, wherein the fluxed pellets produced by the method are superior to the flux pellets comprehensively utilizing a new path of the rotary kiln pellets.
2. The invention can fill lubricant between gear teeth mesh surfaces of the rotary transmission part of the ball mill through the designed anti-abrasion component, can prevent metal from directly contacting, reduces friction loss, can radiate heat and prevent corrosion, improves the working condition of the rotary transmission part of the ball mill, and keeps normal operation and expected service life.
3. According to the invention, the 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 is prevented from being attached and 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 short.
Drawings
FIG. 1 is a flow chart of the method for producing fluxed pellets from steel slag tailings of the present invention;
FIG. 2 is a schematic view of the overall structure of the ball mill of the present invention;
FIG. 3 is a partial schematic view of the present invention;
FIG. 4 is a side view of the overall structure of the ball mill of the present 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 feeding assembly according to the present invention;
FIG. 7 is a schematic view of the structure of the transmission assembly of the present invention;
FIG. 8 is a schematic view of a driving assembly according to the present invention;
FIG. 9 is a schematic view of a cleaning assembly of the present invention;
fig. 10 is an enlarged view of the area a in fig. 7.
In the figure: 1-a base; 2-a rotary drum; 3-a feed end; 4-a discharge end; 5-turning a large gear ring; 6-a small transmission gear; 7-a speed reducer; 8-an electric motor; 9-a wear assembly; 10-a storage cylinder; 11-a separator; 12-an intermittent oil feed assembly; 13-an oil outlet pipeline; 14-an oil outlet channel; 15-sealing block; 16-a piston; 17-a return spring; 18-a reciprocating push rod; 19-a roller; 20-a cam; 21-a first shaft; 22-bearing seat I; 23-a first fixing plate; 24-a transmission assembly; 25-a connecting frame; 26-a drive pulley; 27-a synchronous belt; 28-a driven pulley; 29-a drive shaft; 30-bearing seat II; 31-internal splines; 32-external splines; 33-a second axis; 34-a first bevel gear; 35-third bearing seat; 36-a second fixing plate; 37-a drive assembly; 38-a cleaning assembly; 39-mounting plate; 40-a drive motor; 41-bidirectional screw rod; 42-a threaded block; 43-bearing seat number four; 44-a stop block; 45-a limiting rod; 46-a second bevel gear; 47-a third axis; a No. 48-five bearing seat; 49-third bevel gear; 50-a fourth bevel gear; bearing seat No. 51-six; 52-fourth axis; 53-a drive gear; 54-a rotating ring gear; 55-brush.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example one
Referring to fig. 1, a method for producing a fluxed pellet from steel slag tailings comprises the following steps:
s1: putting 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, the proportion of the granularity of the steel slag tailings after fine grinding to 200 meshes 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 turning the raw materials by using a mixing blade to fully mix the raw materials to be uniform, wherein the rotating speed of a mixing pot of the mixer is 600r/min, when the raw materials are mixed by using the mixer, the rotating speed of the mixing blade 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: transferring the uniformly mixed raw materials into a pelletizer, wherein the rotating speed of the pelletizer is 1400-1600r/min, supplementing water into the pelletizer, the water content of the fed material is 8-12%, pelletizing to produce pellets, and obtaining pellets with the water content of 9.6-10.2% in percentage by weight, wherein the average particle size of the pellets is 9-16mm;
s4: and transferring the pellets into rotary kiln roasting equipment, wherein the time for roasting the pellets by the rotary kiln roasting equipment is 10-15min, the roasting temperature is 1300-1500 ℃, the pellets are regularly distributed on the rotary kiln roasting equipment, the pellets are roasted, the proportion of the fluxed pellets produced by roasting, the granularity of 9-16mm is more than or equal to 85%, and the compressive strength is more than or equal to 2000N.
The steel slag is a slag body which consists of slag-making materials, smelting reactants, furnace bodies and fettling materials which are eroded and shed, impurities brought by metal furnace charges and slag-making materials specially added for adjusting the properties of the steel slag in the production process of steel, is a byproduct in the production process of steel, and consists of various oxides formed by oxidizing impurities in pig iron, such as silicon, manganese, phosphorus, sulfur and the like in the smelting process and salts generated by the reaction of the oxides and a solvent, wherein the main components of the steel slag tailings are shown in a table 1:
table 1: typical value of steel slag tailings
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
The iron powder is a particle aggregate of iron with the size less than 1mm, is a main raw material of powder metallurgy, and is conventionally divided into five grades of coarse powder, medium powder, fine powder, micro powder and ultra-fine powder according to the particle size; the iron powder consisting of particles with a particle size in the range of 150-500 μm is a coarse powder, the iron powder consisting of particles with a particle size in the range of 44-150 μm is a medium powder, the iron powder consisting of particles with a particle size in the range of 10-44 μm is a fine powder, the iron powder consisting of particles with a particle size in the range of 0.5-10 μm is a very fine powder, and the iron powder with a particle size less than 0.5 μm is an ultra fine powder. The powder which can pass through a standard sieve with 325 meshes, namely, the powder with the particle size of less than 44 mu m is generally called sub-sieve powder, and if the sieving is carried out with higher precision, only airflow classification equipment can be used, but for some iron powder which is easy to oxidize, only a JZDF nitrogen protective classifier can be used. The iron powder mainly includes reduced iron powder and atomized iron powder, which are known for their different production modes.
The main component of limestone is calcium carbonate, lime and limestone are used as raw materials of building material and industry, limestone can be directly processed into stone material and calcined into quicklime, the quicklime CaO absorbs moisture or is added with water to form hydrated lime, the hydrated lime is Ca (OH) 2 which can be called as calcium hydroxide, and the hydrated lime is blended into lime slurry, lime paste and the like to be used as coating material and tile adhesive.
The limestone is in the range of below 800 ℃, the average thermal expansion coefficient of microcrystal limestone is (4.5 to 5.0) multiplied by 10 < -6 >/DEG C, the coarse crystal is increased to 10.1 multiplied by 10 < -6 >/DEG C, the heating experiment of the limestone has important significance in lime production, when the temperature is below the decomposition point of the limestone 800 ℃, limestone crystals expand, cracks are formed in the highly crystallized limestone, the crystals are larger and are broken into powder by heating, and the limestone which has good crystal development and contains a lot of compact calcite is seriously pulverized.
The chemical component of the dolomite is CaMg (CO 3) 2, the crystal belongs to carbonate mineral of trigonal crystal system, the crystal structure of the dolomite is similar to calcite, the crystal form is rhombohedral, the crystal face is often bent into saddle shape, and the dolomite can be used as a refractory inner layer of a converter used in steel making, a slagging agent, a cement raw material, a glass flux, kiln industry, fertilizer, building and decorative stone, paint, an 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.
The bentonite is a non-metal mineral product with montmorillonite as a main mineral component, and the montmorillonite structure is 2: the crystal structure of the type 1 has better ion exchange performance because certain cations such as Cu, mg, na, K and the like exist in a layered structure formed by montmorillonite unit cells, and the cations have unstable action with the montmorillonite unit cells and are easy to exchange with 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%。
limestone and dolomite are used for adjusting the alkalinity of the fluxed pellets and the CaO and MgO components, so as to ensure the values in the component load table 2 of the fluxed pellets, and the table 2 comprises the following steps:
table 2: design value of melting pellet
Fe% SiO 2 % CaO% MgO% R 2 The granularity is 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 pellet is superior to the acid pellet in reducing property, softening temperature, melting temperature and other aspects.
Example two
Referring to fig. 1, a method for producing a fluxed pellet from steel slag tailings comprises the following steps:
s1: putting 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 80min, the proportion of the granularity of the steel slag tailings after fine grinding being 200 meshes 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 turning the raw materials by using a mixing blade to fully mix the raw materials until the raw materials are uniform, wherein the rotating speed of a mixing pot of the mixer is 800r/min, when the raw materials are mixed by using the mixer, the rotating speed of the mixing blade 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: transferring the uniformly mixed raw materials into a pelletizer, supplementing water into the pelletizer, pelletizing to produce pellets, and obtaining the pellets with the water content of 9.6-10.2% in percentage by weight, wherein the average particle size of the pellets is 9-16mm, the pelletizing rotation speed of the pelletizer is 1600r/min, and the water content of the fed material is 12%;
s4: the pellets are transferred into rotary kiln roasting equipment, the pellets are evenly distributed on the rotary kiln roasting equipment, the pellets are roasted to produce the 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, which is 9-16mm, is not less than 85%, and the compressive strength of the fluxed pellets is not less than 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 a flux pellet from steel slag tailings comprises the following steps:
s1: putting 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 55min, the proportion of the granularity of the steel slag tailings after fine grinding being 200 meshes 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 turning the raw materials by using a mixing blade to fully mix the raw materials until the raw materials are uniform, wherein the rotating speed of a mixing pot of the mixer is 700r/min, when the raw materials are mixed by using the mixer, the rotating speed of the mixing blade 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: transferring the uniformly mixed raw materials into a pelletizer, supplementing water into the pelletizer, pelletizing to produce pellets, and obtaining the pellets with the water content of 9.6-10.2% in percentage by weight, wherein the average particle size of the pellets is 9-16mm, the pelletizing speed of the pelletizer is 1500r/min, and the water content of the fed materials is 10%;
s4: and transferring the pellets into rotary kiln roasting equipment, wherein the pellets are distributed on the rotary kiln roasting equipment in order, roasting the pellets, and producing fluxed pellets by roasting, wherein the time for roasting the pellets by the rotary kiln roasting equipment is 13min, and the roasting temperature is 1400 ℃.
The steel slag is a slag body which consists of slag-making materials, smelting reactants, furnace bodies and fettling materials which are eroded and shed, impurities brought by metal furnace charges and slag-making materials specially added for adjusting the properties of the steel slag in the production process of steel, is a byproduct in the production process of steel, and consists of various oxides formed by oxidizing impurities in pig iron, such as silicon, manganese, phosphorus, sulfur and the like in the smelting process and salts generated by the reaction of the oxides and a solvent, wherein the main components of the steel slag tailings are shown in a table 1:
table 1: typical value of steel slag tailings
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
The iron powder is a particle aggregate of iron with the size less than 1mm, is a main raw material of powder metallurgy, and is conventionally divided into five grades of coarse powder, medium powder, fine powder, micro powder and ultra-fine powder according to the particle size; the iron powder consisting of particles with the particle size within the range of 150-500 mu m is coarse powder, the iron powder consisting of particles with the particle size within the range of 44-150 mu m is medium powder, the iron powder consisting of particles with the particle size within the range of 10-44 mu m is fine powder, the iron powder consisting of particles with the particle size within the range of 0.5-10 mu m is ultrafine powder, and the iron powder with the particle size less than 0.5 mu m is ultrafine powder. The powder which can pass through a standard sieve with 325 meshes, namely, the powder with the particle size of less than 44 mu m is generally called sub-sieve powder, and if the sieving is carried out with higher precision, only airflow classification equipment can be used, but for some iron powder which is easy to oxidize, only a JZDF nitrogen protective classifier can be used for the sieving. The iron powder mainly includes reduced iron powder and atomized iron powder, which are named because of different production methods.
The main component of limestone is calcium carbonate, lime and limestone are used as raw materials of building material and industry, limestone can be directly processed into stone material and calcined into quicklime, the quicklime CaO absorbs moisture or is added with water to form hydrated lime, the hydrated lime is Ca (OH) 2 which can be called as calcium hydroxide, and the hydrated lime is blended into lime slurry, lime paste and the like to be used as coating material and tile adhesive.
The limestone is in the range of below 800 ℃, the mean thermal expansion coefficient of microcrystal limestone is (4.5 to 5.0) multiplied by 10 < -6 >/DEG C, the coarse crystal is increased to 10.1 multiplied by 10 < -6 >/DEG C, the heating experiment of limestone has important significance in lime production, when the temperature is below 800 ℃ of the decomposition point of the limestone, the limestone crystal is expanded, cracks can be formed in the limestone with high crystallization, and the larger crystal can be broken into powder by heating, and the limestone with good crystal development and a lot of compact calcite is seriously pulverized.
The chemical component of the dolomite is CaMg (CO 3) 2, the crystal belongs to carbonate mineral of trigonal crystal system, the crystal structure of the dolomite is similar to calcite, the crystal form is rhombohedral, the crystal face is often bent into saddle shape, and the dolomite can be used as a refractory inner layer of a converter used in steel making, a slagging agent, a cement raw material, a glass flux, kiln industry, fertilizer, building and decorative stone, paint, an 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.
The bentonite is a non-metal mineral product with montmorillonite as a main mineral component, and the montmorillonite structure is 2: the crystal structure of the type 1 has better ion exchange performance because certain cations, such as Cu, mg, na, K and the like, exist in a layered structure formed by montmorillonite unit cells, and the cations have unstable effects with the montmorillonite unit cells and are easy to exchange with 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 being 9-16mm is more than or equal to 85 percent, and the compressive strength of the fluxed pellets is more than or equal to 2000N.
Example four
Referring to fig. 1, a method for producing a fluxed pellet from steel slag tailings comprises the following steps:
s1: putting the steel slag tailings into a mill, and performing fine grinding operation on the steel slag tailings by the mill, wherein the grinding time is 42min, the proportion of the granularity of the steel slag tailings after fine grinding to 200 meshes 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 turning the raw materials by using a mixing blade to fully mix the raw materials until the raw materials are uniform, wherein the rotating speed of a mixing pot of the mixer is 640r/min, when the raw materials are mixed by using the mixer, the rotating speed of the mixing blade 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: transferring the uniformly mixed raw materials into a pelletizer, supplementing water into the pelletizer, pelletizing to produce pellets, and obtaining the pellets with the water content of 9.6-10.2% in percentage by weight, wherein the average particle size of the pellets is 9-16mm, the pelletizing rotation speed of the pelletizer is 1430r/min, and the water content of the fed material is 9%;
s4: the pellets are transferred into rotary kiln roasting equipment, the pellets are distributed on the rotary kiln roasting equipment in order, the pellets are roasted, fluxed pellets are produced through roasting, 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 being 9-16mm 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 a fluxed pellet from steel slag tailings comprises the following steps:
s1: putting the steel slag tailings into a mill, and finely grinding the steel slag tailings by the mill for 64min, wherein the proportion of the granularity of the finely ground steel slag tailings with the granularity of 200 meshes is more than or equal to 80 percent, and the mill is a moistening 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 a mixing blade to fully mix the raw materials until the raw materials are uniform, wherein the rotating speed of a mixing pot of the mixer is 730r/min, when the raw materials are mixed by using the mixer, the rotating speed of the mixing blade 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: transferring the uniformly mixed raw materials into a pelletizer, supplementing water into the pelletizer, pelletizing to produce pellets, and obtaining the pellets with the water content of 9.6-10.2% in percentage by weight, wherein the average particle size of the pellets is 9-16mm, the pelletizing rotating speed of the pelletizer is 1543r/min, and the water content of the fed material is 12%;
s4: and transferring the pellets into rotary kiln roasting equipment, wherein the pellets are distributed on the rotary kiln roasting equipment in order, roasting the pellets, and producing fluxed pellets by roasting, 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 being 9-16mm 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 existing technology is adopted to produce the acid pellets.
After the method for producing the fluxed pellets by using the steel slag tailings is adopted to produce the fluxed pellets, various performances of the fluxed pellets are detected, and the detection conditions are as follows:
1. detection of reducibility of melting agent pellet
Preparing a fluxed pellet sample, reducing the fluxed pellet sample at the reduction temperature of 500 +/-10 ℃ for 60min under the condition that the concentration of reducing gas components is less than 0.2 percent, reducing the fluxed pellet sample by introducing N2 for cooling, then completely loading the fluxed pellet sample into a small rotary drum (phi 130mm multiplied by 200 mm), rotating the rotary drum for 10min at the rotating speed of 30r/min, screening the sample after the rotary drum, and taking the percentage of the mass of the plus 6.3mm, plus 3.15mm and minus 0.5mm grain fraction to the total mass of the sample after reduction and entering the drum as a reduction index.
2. Detection of softening temperature of melting agent pellet
Flux pellets of a qualified particle size were loaded into a crucible, compacted by a standard method, a silicon carbide rod of 50mm diameter was used as a pressure bar with a load of 2 kg/cm 2, the sample was heated to 800 ℃ under nitrogen feed, then slowly heated up to 5 ℃ per minute, then the temperature was decreased to 0.5 ℃ per minute to 1350 ℃ at a rate, and then the softening temperature of the flux pellets was observed.
3. Detection of melting temperature of melting agent pellet
The flux pellet ore with qualified grain size is loaded into a crucible, is compacted by a standard method, a silicon carbide rod with the diameter of 50mm is used as a pressure rod, the load is 2 kg/cm < 2 >, a sample is heated to 800 ℃ under the condition of introducing nitrogen, then the temperature is slowly increased to 5 ℃ per minute, then the temperature is increased to 1350 ℃ at the speed of decreasing to 0.5 ℃ per minute, and then the melting temperature of the flux pellet ore is observed.
The reduction property, softening temperature and melting temperature of the fluxed pellets were measured, and the measurement results are shown in table 3, and table 3 is as follows:
table 3: detection of performance of melting pellet ore
Reduction degradation index RDI Softening temperature Melting temperature
Example one 34% 1167℃ 1192℃
Example two 33% 1173℃ 1197℃
EXAMPLE III
38% 1123℃ 1164℃
Example four 35% 1158℃ 1184℃
EXAMPLE five 36% 1136℃ 1173℃
Comparative example 23% 1123℃ 1123℃
As can be seen from table 3, the basic pellets are superior to the acid pellets in reducing property, softening temperature, melting temperature, etc.
In summary, the method for producing the fluxed pellets from the steel slag tailings comprises the steps of putting the steel slag tailings into a mill, finely grinding the steel slag tailings by the mill for 30-80min, wherein the granularity of the finely ground steel slag tailings is more than or equal to 80% in a proportion of 200 meshes, transferring the finely ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, stirring and turning the raw materials by using a mixing blade to fully mix the raw materials to be uniform, transferring the uniformly mixed raw materials into a pelletizer, supplementing water into the pelletizer, pelletizing to produce pellets, obtaining pellets with the water content of 9.6-10.2% in percentage by weight, wherein the average particle size of the pellets is 9-16mm, transferring the pellets into rotary kiln roasting equipment, uniformly distributing the pellets on the roasting equipment, roasting the pellets, and roasting the pellets to produce the fluxed pellets.
As shown in fig. 2 and 3, in order to improve the efficiency of fine grinding operation on steel slag tailings, the ball mill is composed of a base 1, a rotary drum 2, a feeding end 3, a discharging end 4, a large rotary 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 both fixed on the base 1 through bolts, the output end of the motor 8 is fixedly connected with the input shaft of the speed reducer 7 through a coupler, the output shaft of the speed reducer 7 is fixedly connected with the middle shaft of the small transmission gear 6 through a coupler, both sides of the middle shaft of the small transmission gear 6 are rotatably connected with gap bearing seats, the feeding end 3 and the discharging end 4 are respectively arranged at the left end and the right end of the rotary drum 2, the feeding end 3 and the discharging end 4 are rotatably connected with limit bearing seats, the limit bearing seats are fixed on the base 1, the large rotary gear ring 5 is fixed at the outer side of the rotary drum 2 and close to the discharging end 4, the small transmission gear ring 6 is engaged with the large rotary gear ring 5, one side of the rotary drum 2 is provided with a wear-preventing assembly 9 for proper lubrication between the tooth surfaces meshed with the large rotary gear ring 5 and the small transmission gear ring 6, the rotary drum has the advantages of convenient and reliable operation and reliable maintenance, and the ball mill is more stable and has the advantages of long-time of being capable of continuous maintenance.
In addition, as shown in fig. 4-6, in order to fill lubricant between gear teeth meshing surfaces of a rotary transmission part of the ball mill, the anti-abrasion assembly 9 includes a storage cylinder 10, a partition plate 11, an intermittent oil supply assembly 12 and an oil outlet pipeline 13, the partition plate 11 is arranged inside the storage cylinder 10, the storage cylinder 10 is made of transparent plastic materials, the partition plate 11 divides an inner cavity of the storage cylinder 10 into a main oil cavity and an auxiliary oil cavity, 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, the intermittent oil supply 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 communicated with the inside of the auxiliary oil cavity, and the other end of the oil outlet pipeline 13 extends to a position right above a meshing 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 conveniently supply the lubricant, the intermittent oil supply 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, 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 slidably penetrates through the bottom of the storage cylinder 10 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 rotatably connected to both sides of the first shaft 21, the first fixing plate 23 is fixed to the bottom of the first bearing seat 22, a connecting frame 25 is fixed to 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 small transmission gear 6.
In addition, as shown in fig. 3 and fig. 7-fig. 10, in order to provide power to the intermittent oil supply assembly 12 by using the motor 8 of the ball mill, the transmission assembly 24 includes a driving pulley 26, a synchronous belt 27 and a driven pulley 28, the driving pulley 26 is fixed on the shaft between the speed reducer 7 and the small transmission gear 6, the driven pulley 28 is in transmission connection with the driving pulley 26 through the synchronous belt 27, a transmission shaft 29 is fixed in a middle hole of the driven 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 carrier 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 an external spline 32 adapted to the external spline 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 fixed with a first bevel gear 34, one end of the second shaft 33 away from the speed reducer 7 is also provided with an external spline 32 adapted to the second shaft, both sides of the second shaft 33 are rotatably connected with a third bearing seat 35, the bottom of the third shaft 35 is fixed with a second fixing plate 36, the bottom of the second fixing plate 36 is provided with a dust cleaning assembly for cleaning the dust-cleaning bearing seat 38 above the first shaft 33, and the motor assembly for cleaning the dust-cleaning assembly above the second shaft 8.
Meanwhile, as shown in fig. 8, in order to combine the intermittent oil supply assembly 12 with the cleaning assembly 38, the driving assembly 37 includes a mounting plate 39, a driving motor 40, a bidirectional screw rod 41 and two screw blocks 42, 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, two screw blocks 42 are provided, the two screw blocks 42 are respectively fixed at 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 screw blocks 42, the middle part of the bidirectional screw rod 41 is rotatably connected with a fourth bearing seat 43, the fourth bearing seat 43 is fixed on the mounting plate 39, a limiting block 44 is fixed at the bottom of the screw block 42, a limiting rod 45 is slidably sleeved on the inner side of the limiting block 44, and one end of the limiting rod 45 is fixedly connected with the outer wall of the fourth bearing seat 43.
When the tooth surfaces of the rotary big gear ring 5 and the small transmission gear 6 which are meshed with each other are properly lubricated: firstly, the driving motor 40 is started to work, the driving motor 40 drives the two-way screw rod 41 to rotate, the two-way screw rod 41 drives the two thread blocks 42 to move close to each other, so that 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 the moment, the motor 8 can be started to work, the motor 8 transmits power to the speed reducer 7 to rotate the shaft between the speed reducer 7 and the small transmission gear 6, so as to drive the driving belt wheel 26 to rotate, the driving belt wheel 26 drives the driven belt wheel 28 to rotate through the synchronous belt 27, the driven belt wheel 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 is matched with the roller 19, so that the reciprocating push rod 18 connected with the roller 19 can reciprocate up and down, the reciprocating push rod 18 can drive the sealing block 15 to reciprocate up and down, so that the oil outlet channel 14 is intermittently opened and closed, the lubricant in the main oil cavity can flow into the auxiliary oil cavity when the ball mill is opened and flow out of the oil outlet pipeline 13, and the lubricant is continuously dripped between the tooth surfaces of the rotary large gear ring 5 and the small transmission gear 6 which are meshed with each other, so that the lubrication between the main oil cavity and the small transmission gear is completed, the lubrication operation can be carried out along with the operation of the ball mill, the stop operation is not needed, the working efficiency of the ball mill is improved, meanwhile, the power between the motor 8 and the wear-resistant assembly 9 can be automatically cut off when the lubrication is not needed, and in conclusion, the wear-resistant assembly 9 can fill the lubricant between the tooth meshing surfaces of the rotary transmission part of the ball mill, the direct contact of metal can be prevented, the friction loss is reduced, and the heat dissipation and rust prevention can be realized.
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 rotating ring gear 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 rotatably connected to the middle portion of the third shaft 47, one end of the fifth bearing seat 48 is fixedly connected to the outer side of the reducer 7, the third bevel gear 49 is fixed at the top portion of the third shaft 47, the fourth bevel gear 50 is connected to the third bevel gear 49 in a meshing manner, the driving gear 53 and the fourth bevel gear 50 are respectively fixed at both ends of the fourth shaft 52, the sixth bearing seat 51 is rotatably connected to the outer side of the fourth shaft 52, and the bottom portion thereof is fixedly connected to the top portion of the reducer 7, the rotating ring gear 54 is rotatably connected to the outer side of the tail end of the motor 8 through a bearing, the brush 55 is fixed on the circumference of the rotating ring gear 54 by a bolt, the inner side of the brush 55 is attached to the vent hole of the tail end of the motor 8, the driving gear 53 is engaged with the rotating ring gear 54, the driving gear is engaged with the rotating ring gear 54, the tail end of the brush, the brush 38, the brush is capable of cleaning assembly, the cleaning vent hole is capable of cleaning brush, thereby preventing dust from being attached to cause the dust on the motor 8, and further prevent the dust collecting net from being reduced, and the dust collecting net 8, thereby preventing the dust collecting net from being reduced.
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 rod 41 to rotate, the bidirectional screw rod 41 drives the two screw blocks 42 to move close to each other, so that the first shaft 21 and the second shaft 33 on the first fixing plate 23 and the second fixing plate 36 slide into 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, so that the shaft between the speed reducer 7 and the small transmission gear 6 rotates, the driving belt wheel 26 drives the driven belt wheel 28 to rotate through the synchronous belt 27, the driven belt wheel 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 third shaft 46 drives the third shaft 47 to rotate the third bevel gear 49, the third bevel gear 49 drives the fourth bevel gear 50 to rotate, the fourth bevel gear 50 drives the fourth shaft 52 to rotate, the fourth shaft 52 drives the driving gear 53 to rotate, the rotary gear 54 drives the rotary gear 54, finally, the tail end of the rotary gear 54 drives the motor 8 to drive the motor to clean the dust on the dust-removing brush 8, and the dust removing brush.
In conclusion, through the designed anti-abrasion assembly 9, not only can lubricant be injected between gear tooth meshing surfaces of a rotary transmission part of the ball mill, but also dust on a vent hole at the tail end of the motor 8 can be cleaned during lubrication.
It should be noted that, in this document, 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. Also, 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 (10)

1. The method for producing the fluxed pellets by the steel slag tailings is characterized by comprising the following steps of:
s1: putting the steel slag tailings into a grinder, and carrying out fine grinding operation on the steel slag tailings by the grinder, wherein the grinding time is 30-80min, and the proportion of the granularity of the steel slag tailings after fine grinding, which is 200 meshes, is more than or equal to 80%;
s2: transferring the finely ground steel slag tailings into a mixer, adding iron powder, limestone, dolomite and bentonite into the mixer, wherein the rotating speed of a mixing pot of the mixer is 600-800r/min, the rotating speed of mixing blades of the mixer is 700-1200r/min, and the mixing time is 52-84min, so that the raw materials are fully mixed to be uniform;
s3: transferring the uniformly mixed raw materials into a pelletizer, wherein the rotating speed of the pelletizer is 1400-1600r/min, supplementing water into the pelletizer, the water content of the fed material is 8-12%, pelletizing to produce pellets, and obtaining pellets with the water content of 9.6-10.2% in percentage by weight, wherein the average particle size of the pellets is 9-16mm;
s4: and transferring the pellets into rotary kiln roasting equipment, wherein the time for roasting the pellets by the rotary kiln roasting equipment is 10-15min, the roasting temperature is 1300-1500 ℃, the pellets are regularly distributed on the rotary kiln roasting equipment, the pellets are roasted, the proportion of the fluxed pellets produced by roasting, the granularity of 9-16mm is more than or equal to 85%, and the compressive strength is more than or equal to 2000N.
2. The method for producing the fluxed pellets from the steel slag tailings as claimed in claim 1, wherein the method comprises the following steps: the mill adopted in the S1 is a ball mill.
3. The method for producing the fluxed pellets from the steel slag tailings as claimed in claim 1, wherein the method comprises the following steps: the fluxed pellets produced by roasting in S4 have the following composition:
Fe：63-66%；SiO2：1.5-4%；CaO：0.8-1.1%；MgO：0.1-1.5%。
4. the method for producing the fluxed pellets from the steel slag tailings as claimed in claim 1, wherein the method comprises the following steps: 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.
5. The method for producing the fluxed pellets from the steel slag tailings as claimed in claim 2, wherein the method comprises the following steps: the ball mill consists 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 fixed on the base (1) through bolts, the output end of the motor (8) is fixedly connected with the input shaft of the speed reducer (7) through a coupling, an output shaft of the speed reducer (7) is fixedly connected with a middle shaft of the small transmission gear (6) through a coupler, both sides of the middle shaft of the small transmission gear (6) are rotatably connected with a gap 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 feeding end (3) and the discharging end (4) are both rotationally connected with a limiting bearing seat, the limiting bearing block is fixed on the base (1), the rotary large gear ring (5) is fixed on the outer side of the rotary cylinder (2) and is close to the discharge end (4), the small transmission gear (6) is meshed with the large rotary gear ring (5), and an anti-abrasion assembly (9) for properly lubricating tooth surfaces meshed with the rotary large gear ring (5) and the small transmission gear (6) is arranged on one side of the rotary cylinder (2).
6. The method for producing the fluxed pellets from the steel slag tailings as claimed in claim 5, wherein the method comprises the following steps: abrasionproof damage subassembly (9) are established including storage cylinder (10), baffle (11), intermittent type nature give oil subassembly (12) and oil outlet pipe way (13), baffle (11) are established the inside of storage cylinder (10), baffle (11) will the inner chamber of storage cylinder (10) divide into main oil pocket and vice oil pocket two parts, set up oil outlet channel (14) that are linked together with main oil pocket and vice oil pocket on baffle (11), sliding contact has sealing block (15) in oil outlet channel (14), the top of sealing block (15) is fixed with piston (16) through the connecting rod, a plurality of through-holes have been seted up on piston (16), piston (16) and the inner wall sliding contact of main oil pocket, piston (16) with be fixed with return spring (17) between baffle (11), intermittent type nature oil subassembly (12) with the bottom transmission of giving sealing block (15) is connected, the one end of oil outlet pipe way (13) is inserted the bottom of storage cylinder (10) and with the inside intercommunication of vice oil pocket, the other end of oil outlet pipe way (13) extends to ring gear (5) and the positive meshing of gyration position mutually.
7. The method for producing the fluxing pellet ore from the steel slag tailings as claimed in claim 6, wherein the method comprises the following steps: 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), the top end of the reciprocating push rod (18) is fixedly connected with the bottom end of a sealing block (15), the bottom end of the reciprocating push rod (18) penetrates through the bottom of the storage cylinder (10) in a sliding mode 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 bearing seats (22) are rotationally connected to two sides of the first shaft (21), the first fixing plate (23) is fixed to the bottom of the first bearing seat (22), a connecting frame (25) is fixed to 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 shaft between the speed reducer (7) and the small transmission gear (6).
8. The method for producing the fluxed pellets from the steel slag tailings as claimed in claim 7, wherein the method comprises the following steps: the transmission assembly (24) comprises a driving belt wheel (26), a synchronous belt (27) and a driven belt wheel (28), 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 rotatably connected with a second bearing seat (30), one end of the second bearing seat (30) is fixedly connected with a bridge bearing seat, inner splines (31) are arranged at two ends of the transmission shaft (29), one end of the first shaft (21) is provided with an outer spline (32) matched with the outer spline (32), one side of the transmission shaft (29) far away from the first shaft (21) is provided with a second shaft (33), a first bevel gear (34) is fixed in the middle of the second shaft (33), one end of the second shaft (33) far away from the speed reducer (7) is also provided with the outer spline (32) matched with the outer spline, a third shaft (35) is connected with a second bearing seat (36), and a third shaft (35) is connected with a fixing plate (36), and a third shaft (35) is fixed plate (36) And a driving component (37) which is clutched with the second shaft (33), and a cleaning component (38) which is used for cleaning dust on a vent hole at the tail end of the motor (8) is also arranged above the first bevel gear (34).
9. The method for producing the fluxed pellets from the steel slag tailings as claimed in claim 8, wherein the method comprises the following steps: drive assembly (37) includes mounting panel (39), driving motor (40), two-way lead screw (41) and screw block (42), mounting panel (39) are fixed one side of speed reducer (7), driving motor (40) are fixed on mounting panel (39), two-way lead screw (41) pass through the shaft coupling with driving motor (40)'s output fixed connection, screw block (42) are equipped with two, and two screw block (42) are fixed respectively first fixed plate (23) with the bottom of second fixed plate (36), two-way lead screw (41) with screw block (42) threaded connection, the middle part of two-way lead screw (41) is rotated and is connected with No. four bearing frame (43), no. four bearing frame (43) are fixed on mounting panel (39), the bottom of screw block (42) is fixed with stopper (44), stopper (44) inboard slip has cup jointed gag lever (45), the one end of gag lever (45) with the outer wall fixed connection of No. four bearing frame (43).
10. The method for producing the fluxed pellets from the steel slag tailings as claimed in claim 8, wherein the method comprises the following steps: the cleaning assembly (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 hairbrush (55), the second bevel gear (46) is fixed at the bottom end of the third shaft (47), the fifth bearing seat (48) is rotatably connected to the middle 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 fixed at the top of the third shaft (47), the fourth bevel gear (50) is connected with the third bevel gear (49) in a meshing manner, 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 rotatably connected to the outer side of the fourth shaft (52), the bottom of the fourth bevel gear (50) is fixedly connected with the top of the speed reducer (7), the tail end of the rotary gear ring (54) is rotatably connected to the outer side of the bearing (8), and the rotary gear ring (55) is fixed to one side of the motor through a bolt hole (8), and the hairbrush (55), the driving gear (53) is meshed with the rotating gear ring (54), and the radius of the brush (55) is equal to that of the tail end face of the motor (8).
CN202210906944.XA 2022-07-29 2022-07-29 Method for producing fluxed pellets from steel slag tailings Active CN115232963B (en)

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