CN111375541A - Screening system and screening method for wet lump ore containing powder - Google Patents

Screening system and screening method for wet lump ore containing powder Download PDF

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Publication number
CN111375541A
CN111375541A CN202010205443.XA CN202010205443A CN111375541A CN 111375541 A CN111375541 A CN 111375541A CN 202010205443 A CN202010205443 A CN 202010205443A CN 111375541 A CN111375541 A CN 111375541A
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China
Prior art keywords
vibrating screen
lump ore
output end
lump
screening
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Granted
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CN202010205443.XA
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Chinese (zh)
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CN111375541B (en
Inventor
陈生利
包锋
陈小东
余骏
刘立广
邓晖
龚健方
蔡林
钟鸽荘
周密
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SGIS Songshan Co Ltd
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SGIS Songshan Co Ltd
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Priority to CN202010205443.XA priority Critical patent/CN111375541B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G65/00—Loading or unloading
    • B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
    • B65G65/32—Filling devices

Abstract

A screening system and a screening method for wet powder-containing lump ore belong to the field of lump ore screening. The screening system of the moist lump ore containing the powder comprises a feeder, a vibrating screen and a shunting mechanism; the input end of the vibrating screen is arranged below the discharge port of the feeder; the shunting mechanism comprises an elastic component and a shunting component, the elastic component is installed at the input end of the vibrating screen, and the shunting component is supported between the input end of the vibrating screen and the discharge hole of the feeding machine through the elastic component, so that lump ore output from the feeding machine can enter the vibrating screen from the shunting component when the vibrating screen is started. The method can avoid lump ore from being accumulated on the vibrating screen, and reduce the difficulty of screening powder by the vibrating screen.

Description

Screening system and screening method for wet lump ore containing powder
Technical Field
The application relates to the field of lump ore screening, in particular to a screening system and a screening method for wet powder-containing lump ores.
Background
In rainy season, the lump ore is high in powder content and moist, a vibrating screen is usually adopted in the field of blast furnaces to screen the lump ore, and the moist lump ore containing powder is easy to adhere to a screen, so that the powder cannot be effectively screened. Some of the prior art screens lump ore powder by increasing the screen area or changing the inclination angle of the screen. But this mode also has some problems to the lump ore powder screening, because generally transmit the lump ore through the batcher operation between shale shaker and the feed bin, all there is not control valve between batcher and the feed bin mouth, after the batcher stall, partial lump ore can drop to the batcher depending on the action of gravity, under the aftershock of batcher, can lead to partial lump ore to fall to the shale shaker sieve bed, the shale shaker stop operation this moment, lead to at every turn when the shale shaker operates, all there is the clout on the sieve bed, this has increased the degree of difficulty of sieve bed screening powder. In addition, some can carry out the water conservancy diversion through the guide plate that increases the slope setting before the shale shaker among the prior art, but when the shale shaker stopped operating, lump ore deposit on the guide plate that the slope set up also can drop to the shale shaker under the action of gravity on, this also can increase the degree of difficulty of sieve bed screening powder.
Disclosure of Invention
The embodiment of the application provides a screening system and a screening method for wet powder-containing lump ore, which can avoid the accumulation of the lump ore on a vibrating screen and reduce the difficulty of screening powder by the vibrating screen.
The embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a screening system for wet lump ore containing powder, including a feeder, a vibrating screen and a flow dividing mechanism;
the input end of the vibrating screen is arranged below the discharge port of the feeder;
the shunting mechanism comprises an elastic component and a shunting component, the elastic component is installed at the input end of the vibrating screen, and the shunting component is supported between the input end of the vibrating screen and the discharge hole of the feeding machine through the elastic component, so that lump ore output from the feeding machine can enter the vibrating screen from the shunting component when the vibrating screen is started.
In the above technical scheme, the reposition of redundant personnel part sets up between the output of the input of shale shaker and batcher, and the input of shale shaker sets up in the discharge gate below of batcher, then the lump ore that comes out from the discharge gate of batcher can fall on the reposition of redundant personnel part earlier, enters into the shale shaker again. Because the elastic component is arranged at the input end of the vibrating screen, when the vibrating screen stops running, the elastic component is in a static state without the action of external force, and lump ore stays on the flow dividing component; when the vibrating screen starts to operate, the elastic component can move along with the vibrating screen under the vibrating action of the vibrating screen, so that lump ores on the shunting component move and enter the vibrating screen, accumulation of the lump ores on the vibrating screen can be avoided, and the screening difficulty of the vibrating screen is reduced.
In a possible embodiment, the flow dividing part comprises a support plate and a protruding strip, the protruding strip is arranged on one surface of the support plate close to the feeding machine, and the protruding strip extends along the conveying direction of the vibrating screen.
In above-mentioned technical scheme, the sand grip divides into a plurality of splitter boxes with the backup pad, and when the shale shaker started, the lump ore that is arranged in different splitter boxes can enter into the different positions of shale shaker, has further avoided the accumulation of lump ore at the shale shaker.
In a possible embodiment, the support plate has an angle of-5 to 5 ° with the horizontal plane.
In the technical scheme, the inventor researches and tests show that the included angle between the supporting plate and the horizontal plane is-5 degrees, and when the vibrating screen stops moving, lump ore on the shunting part can be better ensured not to fall to the vibrating screen to cause the accumulation of the lump ore on the vibrating screen.
In one possible embodiment, the area of the vibrating screen is 1.8 to 2.2m 2.8 to 3.2 m.
In the technical scheme, the area of the vibrating screen is 1.8-2.2 m x 2.8-3.2 m, so that the vibrating screen is ensured to have a larger area, the thickness of lump ore on the vibrating screen is thinned, and the powder screening is facilitated.
In a possible embodiment, the screening system further comprises a receiving hopper for collecting large-particle lump ores in the lump ores, the receiving hopper is arranged below the output end of the vibrating screen, the height difference between the top end of the receiving hopper and the output end of the vibrating screen is 450-550 mm, and the horizontal distance between the edge of the receiving opening of the receiving hopper close to the output end of the vibrating screen and the output end of the vibrating screen is 45-55 mm.
In the technical scheme, after the lump ore is subjected to vibration screening by the vibrating screen, a certain speed is achieved along the inclination angle direction of the vibrating screen, the lump ore can bounce by a certain height along the amplitude direction of the vibrating screen, when the lump ore flows through the tail end of a sieve bed of the vibrating screen, the parabola motion radian of the lump ore with large granularity is large, and the powder radian of the lump ore with small granularity is small. Research and test of an applicant show that the height difference between the top end of the receiving hopper and the output end of the vibrating screen is 450-550 mm, the horizontal distance between the edge of the receiving port of the receiving hopper close to the output end of the vibrating screen and the output end of the vibrating screen is 45-55 mm, and large-particle lump ore can be better collected.
In a possible implementation scheme, a guide chute is arranged below the output end of the vibrating screen, one end of the guide chute, which is far away from the output end of the vibrating screen, has a projection on the vibrating screen, the height difference between the end of the guide chute, which is close to the output end of the vibrating screen, and the output end of the vibrating screen is 10-15mm, the projection of the guide chute on the horizontal plane comprises a first dead point and a second dead point, the second dead point is overlapped with the projection of the vibrating screen on the horizontal plane, and the horizontal distance between the first dead point and the output end of the vibrating screen is less than or equal to 20 mm.
In the technical scheme, the radian of the powder with small granularity is small when the powder flows through the tail end of the sieve bed of the vibrating sieve, and the guide chute is used for collecting lump ore powder with small granularity. The applicant researches and tests to find that the height difference between one end of the guide chute close to the output end of the vibrating screen and the output end of the vibrating screen is 10-15mm, the horizontal distance between the first dead point and the output end of the vibrating screen is less than or equal to 20mm, lump ore with the granularity less than 5mm can basically enter the guide chute, and the lump ore with small particle size is collected by the guide chute, so that the powder entering the furnace can be reduced.
In a possible embodiment, the included angle between the bottom surface of the guide chute and the horizontal plane is 60-65 degrees.
In the technical scheme, the included angle between the bottom surface of the guide chute and the horizontal plane is 60-65 degrees, and small-particle-size lump ores collected by the guide chute can be conveniently guided to equipment corresponding to the next procedure.
In a second aspect, the present application provides a method for screening wet lump ore containing fine powder, which is mainly performed by using the lump ore screening system for wet lump ore containing fine powder of the first aspect, and includes:
lump ore falls to the flow dividing part through an outlet of the feeder, and the lump ore stays in the flow dividing part when the vibrating screen stops running; when the vibrating screen is started, lump ore is conveyed to the vibrating screen in the flow dividing part under the action of the elastic part.
In the technical scheme, when the vibrating screen stops running, lump ore stays on the flow dividing component; when the vibrating screen starts to operate, the elastic component can move along with the vibrating screen under the vibrating action of the vibrating screen, so that lump ore on the shunting component moves and enters the vibrating screen, the phenomenon that the lump ore directly falls to the vibrating screen from the feeder to cause mineral accumulation can be avoided, and the screening difficulty of the vibrating screen is reduced.
In a possible embodiment, the method further comprises adjusting the inclination angle of the vibrating screen, including:
calculating the theoretical running time of the lump ore on the vibrating screen as tTheory 1Measuring the actual running time of the lump ore on the vibrating screen as tPractice 1Wherein, tTheory 1/tPractice 1K, where K is the coefficient of friction;
determining the running time of lump ore needing to be on a vibrating screen as t according to the production requirement of the blast furnace;calculating the theoretical running time t of the lump ore on the vibrating screen through K and tTheory 2；
According to the formula tTheory 2＝S/V2Calculating the speed V of lump ore along the length direction of the vibrating screen2Wherein S is the length of the vibrating screen;
according to formula V2The inclination angle β of the shaker was calculated as V Sin β, where V is the speed at which the lump ore falls to the input end of the shaker.
In the technical scheme, the inclination angle of the vibrating screen is related to the running time of the lump ore on the vibrating screen, the running time of the lump ore on the vibrating screen is determined according to the production requirement of the blast furnace, and the inclination angle of the vibrating screen obtained through calculation can enable the lump ore to run on the vibrating screen for enough time to better screen the lump ore under the condition that the use efficiency of the lump ore is not influenced.
In one possible embodiment, the theoretical run time of the lump ore on the vibrating screen is calculated as tTheory 1Comprises the following steps:
the height from one end of the flow dividing component close to the vibrating screen to the input end of the vibrating screen is h, and the height is obtained through the formula h-1/2 g t2Calculating the falling time t of the lump ore falling from the shunting part to the input end of the vibrating screen, and calculating the speed V of the lump ore falling to the input end of the vibrating screen according to a formula V which is gt;
presetting the inclination angle of the vibrating screen to α according to the formula V1V Sin α calculates the speed V of lump ore along the length direction of the vibrating screen1Assuming that the friction resistance coefficient of the vibrating screen is 0, according to the formula tTheory 1＝S/V1Calculating to obtain tTheory 1And S is the length of the vibrating screen.
In the technical scheme, t can be accurately calculated through the stepsTheory 1。
In a possible embodiment, the powder content of the lump ore is more than 20%, the included angle between the vibrating screen and the horizontal plane is 20-30 degrees, and the running time of the lump ore on the vibrating screen is 6-8 s.
In the technical scheme, the inventor researches and tests show that the included angle between the vibrating screen and the horizontal plane is 20-30 degrees, the running time of the lump ore on the vibrating screen is 6-8 s, and the lump ore can run on the vibrating screen for enough time to better screen the lump ore with the powder content of more than 20% under the condition of not influencing the use efficiency of the lump ore.
In a possible embodiment, a material guiding groove is arranged below the output end of the vibrating screen, one end of the material guiding groove far away from the output end of the vibrating screen has a projection on the vibrating screen, the projection of the material guiding groove on the horizontal plane comprises a first stop point and a second stop point, the second stop point is overlapped with the projection of the vibrating screen on the horizontal plane, and the determination of the horizontal distance between the first stop point and the output end of the vibrating screen comprises the following steps:
according to the amplitude of the vibrating screen, the height difference between one end of the guide chute close to the output end of the vibrating screen and the output end of the vibrating screen is determined, and the horizontal distance between the first stop point and the output end of the vibrating screen is determined by enabling only lump ores with the powder granularity smaller than 5mm to completely enter the guide chute.
In above-mentioned technical scheme, the lump ore has certain speed along shale shaker inclination direction after the shale shaker vibration screening, and the lump ore can bounce certain height along shale shaker amplitude direction, and when flowing through shale shaker sieve bed end, the parabola motion radian can be big for the big lump ore of granularity, and the powder radian that the granularity is little, and the baffle box is used for collecting the lump ore powder that the granularity is little. The horizontal distance between the first dead point and the output end of the vibrating screen determined by the method can ensure that only lump ores with the powder granularity of less than 5mm enter the guide chute, and the lump ores with the powder granularity of more than 5mm cannot enter the guide chute, so that the lump ores with the granularity of less than 5mm are reduced from entering the blast furnace.
The screening system and the screening method for the wet powder-containing lump ore have the following beneficial effects:
the elastic component is arranged at the input end of the vibrating screen, so that when the vibrating screen stops running, the elastic component is in a static state without the action of external force, and lump ore stays on the flow dividing component; when the vibrating screen starts to operate, under the action of the elastic component, lump ores on the shunting component move and enter the vibrating screen, the lump ores can be prevented from being accumulated on the vibrating screen, and the screening difficulty of the vibrating screen is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic structural diagram of a screening system provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a flow dividing member according to an embodiment of the present application.
Icon: 10-a screening system; 11-a feeder; 111-a silo; 112-a silo mouth; 12-a vibrating screen; 121-input terminal; 122-an output terminal; 13-a flow splitting mechanism; 131-an elastic member; 132-a flow splitting component; 1321-a support plate; 1322-convex strips; 14-a material guide groove; 15-a receiving hopper; 151-receiving port.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
In the description of the present application, it should be noted that the terms "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when products of the application are used, and are used only for convenience in describing the application and simplifying the description, but do not indicate or imply that the devices or elements to be referred must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal" and the like do not mean that the components are required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "mounted" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The above terms are understood in a concrete manner to those of ordinary skill in the art.
The following is a detailed description of the screening system 10 and the screening method for wet lump ore containing fine powder according to the embodiment of the present application:
referring to fig. 1, fig. 1 shows a schematic structural diagram of a screening system 10 for wet powder-containing lump ore, wherein the screening system 10 includes a feeder 11, a vibrating screen 12 and a diversion mechanism 13.
The shaker 12 is provided with a vibration motor to enable the shaker 12 to generate vibrations, the shaker 12 including an input 121 and an output 122, the lump ore being conveyed at the shaker 12 through the input 121 to the output 122. Wherein, the input end 121 of the vibrating screen 12 is arranged below the discharge port of the feeder 11. Illustratively, the area of the shaker 12 is 1.8-2.2 m 2.8-3.2 m. The vibrating screen 12 is ensured to have a larger area, so that the thickness of the lump ore on the vibrating screen 12 is reduced, and the sieving of the powder is facilitated.
The diversion mechanism 13 comprises an elastic component 131 and a diversion component 132, the elastic component 131 is mounted at the input end 121 of the vibrating screen 12, and the diversion component 132 is supported between the input end 121 of the vibrating screen 12 and the discharge port of the feeder 11 through the elastic component 131, so that the lump ore output from the feeder 11 can enter the vibrating screen 12 from the diversion component 132 when the vibrating screen 12 is started. The elastic member 131 is exemplarily a buffer spring, and the buffer spring may be provided in plural. Illustratively, the buffer spring of the embodiment of the present application is 70-85 mm, for example, 70mm, 73mm, 75mm, 78mm, 80mm, 83mm or 85 mm. It is to be understood that the elastic member 131 is not limited to a buffer spring, and may be a bent elastic piece or the like.
The shunting part 132 is arranged between the input end 121 of the vibrating screen 12 and the discharge port of the feeder 11, and the input end 121 of the vibrating screen 12 is arranged below the discharge port of the feeder 11, so that lump ore discharged from the discharge port of the feeder 11 falls on the shunting part 132 firstly and then enters the vibrating screen 12. Since the elastic member 131 is installed at the input end 121 of the vibrating screen 12, when the vibrating screen 12 stops operating, the elastic member 131 is in a static state without an external force, and the lump ore stays on the diverting member 132. In addition, the diversion member 132 is disposed between the input end 121 of the vibrating screen 12 and the discharge port of the feeder 11, that is, the diversion member 132 is not in contact with the feeder 11, so that the vibration after the feeder 11 is stopped can be prevented from being transmitted to the diversion member 132. When the vibrating screen 12 is started to operate, the elastic component 131 moves along with the vibrating screen 12 under the vibrating action of the vibrating screen 12, so that lump ore on the flow dividing component 132 moves and enters the vibrating screen 12, the lump ore can be prevented from being accumulated on the vibrating screen 12, and the screening difficulty of the vibrating screen 12 is reduced.
Illustratively, the feeder 11 includes a bin 111 and a bin nozzle 112, the bin nozzle 112 is disposed below an outlet of the bin 111, and the diversion component 132 is disposed below a discharge port of the bin nozzle 112. The mineral enters the bin 111 and then passes through the bin mouth 112 to the diversion member 132.
Further, referring to fig. 2, the flow dividing member 132 includes a supporting plate 1321 and a protruding strip 1322, the protruding strip 1322 is disposed on a surface of the supporting plate 1321 close to the feeder 11, and the protruding strip 1322 extends along the conveying direction of the vibrating screen 12. The raised line 1322 divides the support plate 1321 into a plurality of splitter boxes, the extension direction of the splitter boxes is the same as the conveying direction of the vibrating screen 12, lump ore can enter different splitter boxes from the discharge port of the feeder 11, when the vibrating screen 12 is started, the lump ore in different splitter boxes can enter different positions of the vibrating screen 12, the lump ore is promoted to be reasonably distributed on the vibrating screen 12, the accumulation of the lump ore on the vibrating screen 12 is further avoided, and the screening effect is improved.
In addition, with reference to fig. 1, when the area of the vibrating screen 12 is 1.8-2.2 m × 2.8-3.2 m, the width of the supporting plate 1321 is 1.8-2.2 m, and the width of the supporting plate 1321 is substantially equal to that of the vibrating screen 12, so that the minerals in the diversion channel can be prevented from scattering outside the vibrating screen 12 when entering the vibrating screen 12, the minerals on both sides of the diversion component 132 can fall to the edge of the vibrating screen 12, and the minerals can be more reasonably distributed on the vibrating screen 12.
In one possible embodiment, the support plate 1321 is angled from-5 to 5 ° from horizontal. The inventor researches and tests to find that the included angle between the support plate 1321 and the horizontal plane is-5 degrees, and when the vibrating screen 12 stops moving, lump ores on the flow dividing part 132 can be better ensured not to fall to the vibrating screen 12 to cause the accumulation of the lump ores on the vibrating screen 12. Optionally, the angle of support plate 1321 with the horizontal is-5 °, -3 °, -1 °, 0 °, 1 °, 3 °, or 5 ° -degrees
Further, in order to collect large-particle lump ores screened by the vibrating screen 12, the screening system 10 further includes a receiving hopper 15 for collecting large-particle lump ores in the lump ores, the receiving hopper 15 is disposed below the output end 122 of the vibrating screen 12, a height difference H2 between the top end of the receiving hopper 15 and the output end 122 of the vibrating screen 12 is 450-550 mm, and a horizontal distance L2 between an edge of the receiving port 151 of the receiving hopper 15, which is close to the output end 122 of the vibrating screen 12, and the output end 122 of the vibrating screen 12 is 45-55 mm. Illustratively, H2 is 450mm, 470mm, 490mm, 500mm, 510mm, 530mm, or 550 mm. Exemplary L2 is 45mm, 47mm, 49mm, 50mm, 51mm, 53mm or 55 mm.
After the lump ore is subjected to vibration screening by the vibrating screen 12, a certain speed is achieved along the inclination angle direction of the vibrating screen 12, the lump ore can bounce by a certain height along the amplitude direction of the vibrating screen 12, when the lump ore flows through the tail end of the sieve bed of the vibrating screen 12, the parabola motion radian of the lump ore with large granularity is large, and the powder radian of the lump ore with small granularity is small. The applicant researches and tests that the height difference between the top end of the receiving hopper 15 and the output end 122 of the vibrating screen 12 is 450-550 mm, the horizontal distance between the edge of the receiving port 151 of the receiving hopper 15 close to the output end 122 of the vibrating screen 12 and the output end 122 of the vibrating screen 12 is 45-55 mm, and large-particle lump ores can be better collected. The receiving port 151 of the receiving hopper 15 may have a circular cross section or a square cross section, and the shape of the receiving port 151 of the receiving hopper 15 is not limited in this embodiment.
Illustratively, a conveying belt is arranged below the discharge end of the receiving hopper 15, and the collected large-particle lump ore can be conveyed to a blast furnace for use through the conveying belt.
Further, in order to collect lump ore powder having a small particle size, a material guide chute 14 is exemplarily provided below the output end 122 of the vibrating screen 12. In the height direction, the end of the material guide chute 14 far away from the output end 122 of the vibrating screen 12 has a projection on the vibrating screen 12, the height difference H1 between the end of the material guide chute 14 close to the output end 122 of the vibrating screen 12 and the output end 122 of the vibrating screen 12 is 10-15mm, the projection of the material guide chute 14 on the horizontal plane comprises a first dead point and a second dead point, the second dead point is overlapped with the projection of the vibrating screen 12 on the horizontal plane, the horizontal distance L1 between the first dead point and the output end 122 of the vibrating screen 12 is not more than 20mm, and L1 is, for example, 5mm, 8mm, 10mm, 12mm, 14mm, 15mm, 17mm, 18mm or 20 mm.
The applicant researches and tests show that the height difference between one end of the guide chute 14 close to the output end 122 of the vibrating screen 12 and the output end 122 of the vibrating screen 12 is 10-15mm, the horizontal distance between the first dead point and the output end 122 of the vibrating screen 12 is less than or equal to 20mm, lump ore with the granularity of less than 5mm can basically enter the guide chute 14, lump ore with the powder granularity of more than 5mm cannot enter the guide chute 14, and the lump ore with the small particle size is collected through the guide chute 14, so that the powder entering into the furnace can be reduced. Illustratively, H1 is 10mm, 11mm, 12mm, 13mm, 14mm, or 15 mm.
In addition, when the receiving hopper 15 and the guide chute 14 are arranged simultaneously, the receiving hopper 15 and the guide chute 14 collect large-particle lump ore and lump ore powder respectively, so that the conveying is convenient, the lump ore powder can be reduced from being mixed in the large-particle lump ore, and the powder entering the furnace is further reduced.
Alternatively, a powder returning belt is provided at the lower end of the guide chute 14, and the lump ore powder collected by the guide chute 14 can be transported to other places through the powder returning belt. Illustratively, the included angle between the bottom surface of the material guide chute 14 and the horizontal plane is 60-65 °, and the arrangement can facilitate guiding the small-particle-size lump ore collected by the material guide chute 14 to the powder return belt. Illustratively, the angle between the bottom surface of the chute 14 and the horizontal is 60 °, 62 °, 64 °, or 65 °.
The embodiment of the present application further provides a method for screening wet lump ore containing powder, which is mainly performed by using the above lump ore screening system 10 for wet lump ore containing powder, and includes:
the lump ore falls to the flow dividing part 132 through the outlet of the feeder 11, and when the vibrating screen 12 stops operating, the lump ore stays in the flow dividing part 132; when the vibrating screen 12 is started, lump ore is sent to the vibrating screen 12 at the diversion part 132 by the elastic part 131.
When the vibrating screen 12 stops operating, lump ore stays on the diversion part 132; when the vibrating screen 12 starts to operate, the elastic component 131 moves along with the vibrating screen 12 under the vibrating action, so that lump ore on the flow dividing component 132 moves and enters the vibrating screen 12, the lump ore can be prevented from directly falling to the vibrating screen 12 from the feeder 11 to cause mineral accumulation, and the screening difficulty of the vibrating screen 12 is reduced.
Further, the angle of inclination of the vibrating screen 12 may also be adjusted in order to better screen the lump ore. It should be noted that the inclination angle of the vibrating screen 12 refers to the angle of the vibrating screen 12 with respect to the horizontal plane. The step of adjusting the angle of inclination of the shaker 12 includes:
(1) calculating the theoretical running time t of the lump ore on the vibrating screen 12Theory 1The actual running time of the measured lump ore on the vibrating screen 12 is tPractice 1Wherein, tTheory 1/tPractice 1Is K, wherein K isCoefficient of friction;
(2) determining the running time of lump ore on the vibrating screen 12 as t according to the production requirement of the blast furnace; calculating the theoretical running time t of the lump ore on the vibrating screen 12 through K and tTheory 2；
(3) According to the formula tTheory 2＝S/V2Calculating the speed V of the lump ore along the length direction of the vibrating screen 122Wherein S is the length of the vibrating screen 12;
(4) according to formula V2The inclination angle β of the shaker 12 is calculated as V Sin β, where V is the speed at which the lump ore falls to the input end 121 of the shaker 12.
The inclination angle of the vibrating screen 12 is related to the running time of the lump ore on the vibrating screen 12, the running time of the lump ore on the vibrating screen 12 is determined according to the production requirement of the blast furnace, and the finally calculated inclination angle of the vibrating screen 12 can ensure that the lump ore can run on the vibrating screen 12 for enough time to better screen the lump ore without influencing the use efficiency of the lump ore.
Further, the theoretical running time of the lump ore on the vibrating screen 12 is calculated as tTheory 1Comprises the following steps:
s1, the height from the end of the diversion member 132 close to the vibrating screen 12 to the input end 121 of the vibrating screen 12 is h, which is represented by the formula h 1/2 g t2Calculating the falling time t of the lump ore falling from the flow dividing component 132 to the input end 121 of the vibrating screen 12, and calculating the speed V of the lump ore falling to the input end 121 of the vibrating screen 12 according to the formula V-gt;
s2, presetting the inclination angle of the vibrating screen 12 to α according to the formula V1The velocity V of the lump ore along the length of the vibrating screen 12 is calculated as V + Sin α1Assuming that the friction resistance coefficient of the vibration sieve 12 is 0, the formula t is givenTheory 1＝S/V1Calculating to obtain tTheory 1Where S is the length of the shaker 12.
T can be calculated more accurately through the stepsTheory 1。
Illustratively, in one possible embodiment, the wet lump ore has a fines content of more than 20%, the vibrating screen 12 has an angle of 20 to 30 ° with the horizontal plane, and the lump ore runs on the vibrating screen 12 for 6 to 8 seconds. The inventor researches and tests show that the included angle between the vibrating screen 12 and the horizontal plane is 20-30 degrees, the running time of the lump ore on the vibrating screen 12 is 6-8 s, and the lump ore can run on the vibrating screen 12 for enough time to better screen the lump ore with the powder content of more than 20% under the condition of not influencing the use efficiency of the lump ore. Optionally, the lump ore has a fines content of 21%, 23%, 25%, or 30%. Additionally, the shaker 12 may optionally be at an angle of 20 °, 22 °, 24 °, 25 °, 26 °, 28 °, or 30 ° to the horizontal. The run time of the lump ore on the shaker 12 is optionally 6s, 7s or 8 s.
Further, when the chute 14 is included in the screening system 10, the projection of the chute 14 onto the horizontal plane includes a first dead point and a second dead point, and the determination of the horizontal distance from the first dead point to the output end 122 of the vibrating screen 12 includes the steps of: the height difference between the end of the material guide chute 14 close to the output end 122 of the vibrating screen 12 and the output end 122 of the vibrating screen 12 is determined according to the amplitude of the vibrating screen 12, and the horizontal distance between the first dead point and the output end 122 of the vibrating screen 12 is determined by using the fact that only lump ores with the powder granularity smaller than 5mm completely enter the material guide chute 14.
The horizontal distance between the first dead point and the output end 122 of the vibrating screen 12 determined by the method can ensure that all lump ores with the powder granularity of less than 5mm enter the material guide groove 14, and the lump ores with the powder granularity of more than 5mm cannot enter the material guide groove 14, so that the lump ores with the powder granularity of less than 5mm enter the blast furnace.
The wet lump ore containing screening system 10 and the screening method according to the embodiment of the present application will be described in further detail with reference to the following examples.
Example 1
The embodiment provides a screening system 10 for wet powder-containing lump ore, and the screening system 10 comprises a feeder 11, a vibrating screen 12, a flow dividing mechanism 13, a material guide chute 14 and a material receiving hopper 15. The supporting plate 1321 of the flow dividing mechanism 13 is horizontally arranged, the height difference between the end of the supporting plate 1321 and the input end 121 of the vibrating screen 12 is 180mm, the height difference between one end of the guide chute 14, which is close to the output end 122 of the vibrating screen 12, and the output end 122 of the vibrating screen 12 is 12mm, the horizontal distance between the first dead point and the output end 122 of the vibrating screen 12 is 20mm, the inclination angle of the vibrating screen 12 is 26 °, the height difference between the top end of the receiving hopper 15 and the output end 122 of the vibrating screen 12 is 500mm, and the horizontal distance between the edge of the receiving port 151 of the receiving hopper 15, which is close to the output end 122 of the vibrating screen 12, and the output end 122 of the vibrating screen 12.
The present embodiment also provides a method for screening wet lump ore containing powder, which includes: lump ore having a powder content of 20% was sieved by the sieving system 10 described above.
Example 2
The embodiment provides a screening system 10 for wet powder-containing lump ore, and the screening system 10 comprises a feeder 11, a vibrating screen 12, a flow dividing mechanism 13, a material guide chute 14 and a material receiving hopper 15. The supporting plate 1321 of the flow dividing mechanism 13 is horizontally arranged, the height difference between the end of the supporting plate 1321 and the input end 121 of the vibrating screen 12 is 180mm, the height difference between one end of the guide chute 14, which is close to the output end 122 of the vibrating screen 12, and the output end 122 of the vibrating screen 12 is 10mm, the horizontal distance between the first dead point and the output end 122 of the vibrating screen 12 is 15mm, the inclination angle of the vibrating screen 12 is 20 °, the height difference between the top end of the receiving hopper 15 and the output end 122 of the vibrating screen 12 is 500mm, and the horizontal distance between the edge of the receiving port 151 of the receiving hopper 15, which is close to the output end 122 of the vibrating screen 12, and the output end 122 of the vibrating screen 12.
The present embodiment also provides a method for screening wet lump ore containing powder, which includes: lump ore with a fines content of 25% was screened using the screening system 10 described above.
Example 3
The present embodiment provides a screening system 10 and method for wet dust-laden lump ore, the screening system 10 being substantially the same as the screening system 10 of embodiment 1 except that the horizontal distance between the first dead point and the output end 122 of the vibrating screen 12 is 25 mm.
Test examples
(1) The large-particle lump ores collected in the receiving hoppers 15 of examples 1 to 3 were analyzed, and the weight of the lump ore having a particle size of 5mm or more was M1, and the weight of the lump ore powder having a particle size of 5mm or less was M2, where M2/(M1+ M2) is the charging rate of the lump ore powder, and the results are shown in table 1.
(2) The lump ores collected in the material guide chute 14 of examples 1 to 3 were analyzed to obtain a lump ore weight of 8mm or more in m1 and a lump ore powder weight of 8mm or less in m2, wherein m1/(m1+ m2) is the return fines run rate, and the results are shown in table 1.
TABLE 1 test results of examples 1 to 3
Example 1 Example 2 Example 3
Charging rate of lump ore powder 1.5％ 1.25％ 1.47％
Powder return and coarse rate 0.28％ 0.42％ 1.05％
And (4) analyzing results: as can be seen from the results in table 1, the wet lump ore screening system 10 according to the embodiment of the present application has a small lump ore powder charging rate and a small return powder leakage rate, and can effectively screen lump ores with a wet powder content of 20% to 25% and reduce the waste of large-particle-size lump ores.
The foregoing is illustrative of the present application and is not to be construed as limiting thereof, as numerous modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (12)

1. A wet dust-laden lump ore screening system, comprising: the device comprises a feeding machine, a vibrating screen and a shunting mechanism;
the input end of the vibrating screen is arranged below the discharge port of the feeder;
the flow dividing mechanism comprises an elastic component and a flow dividing component, the elastic component is mounted at the input end of the vibrating screen, and the flow dividing component is supported between the input end of the vibrating screen and the discharge port of the feeding machine through the elastic component, so that lump ore output from the feeding machine can enter the vibrating screen from the flow dividing component when the vibrating screen is started.
2. A screening system according to claim 1, wherein the diverter component includes a support plate and a rib, the rib being disposed on a face of the support plate adjacent the feeder and extending in the conveying direction of the shaker.
3. A screening system according to claim 2, wherein the support plate is angled from-5 to 5 ° to the horizontal.
4. A screening system according to claim 1, wherein the area of the vibrating screen is 1.8 to 2.2m x 2.8 to 3.2 m.
5. A screening system according to any one of claims 1 to 4, further comprising a receiving hopper for collecting large-particle lump ore in the lump ore, wherein the receiving hopper is arranged below the output end of the vibrating screen, the height difference between the top end of the receiving hopper and the output end of the vibrating screen is 450-550 mm, and the horizontal distance between the edge of the receiving port of the receiving hopper close to the output end of the vibrating screen and the output end of the vibrating screen is 45-55 mm.
6. A screening system according to any one of claims 1 to 4, wherein a material guide chute is arranged below the output end of the vibrating screen, a projection is formed on the vibrating screen at one end of the material guide chute, which is far away from the output end of the vibrating screen, the height difference between one end of the material guide chute, which is close to the output end of the vibrating screen, and the output end of the vibrating screen is 10-15mm, the projection of the material guide chute on the horizontal plane comprises a first dead point and a second dead point, the second dead point is overlapped with the projection of the vibrating screen on the horizontal plane, and the horizontal distance between the first dead point and the output end of the vibrating screen is less than or equal to 20 mm.
7. A screening system according to claim 6, wherein the angle between the bottom surface of the chute and the horizontal is 60-65 °.
8. A method of screening moist lump ore containing fines, substantially using the moist lump ore screening system of any one of claims 1 to 7, comprising:
lump ore falls to the flow dividing part through an outlet of the feeder, and when the vibrating screen stops operating, the lump ore stays in the flow dividing part; when the vibrating screen is started, lump ore is conveyed to the vibrating screen through the flow dividing part under the action of the elastic part.
9. A screening method according to claim 8, further comprising adjusting the inclination angle of the vibrating screen, including:
calculating the theoretical running time of the lump ore in the vibrating screen as tTheory 1Measuring the actual running time of the lump ore on the vibrating screen as tPractice 1Wherein, tTheory 1/tPractice 1K, where K is the coefficient of friction;
determining the running time of lump ore required by the vibrating screen as t according to the production requirement of the blast furnace; calculating the theoretical running time t of the lump ore on the vibrating screen through the K and the tTheory 2；
According to the formula tTheory 2＝S/V2Calculating the speed V of the lump ore along the length direction of the vibrating screen2Wherein S is the length of the vibrating screen;
according to formula V2The inclination angle β of the shaker was calculated as V Sin β, where V is the speed at which the lump ore falls to the input end of the shaker.
10. A screening method according to claim 9, wherein the calculated lump ore theoretical run time on the vibrating screen is tTheory 1Comprises the following steps:
the height from one end of the flow dividing component close to the vibrating screen to the input end of the vibrating screen is h, and the height is 1/2 g t2Calculating the falling time t of the lump ore from the shunting part to the input end of the vibrating screen, and calculating the speed V of the lump ore falling to the input end of the vibrating screen according to a formula V ═ gt;
presetting the inclination angle of the vibrating screen to α according to a formula V1Calculating the speed V of the lump ore along the length direction of the vibrating screen by V Sin α1Assuming that the friction resistance coefficient of the vibrating screen is 0, according to the formula tTheory 1＝S/V1Calculating to obtain tTheory 1And S is the length of the vibrating screen.
11. A screening method according to claim 9, wherein the lump ore contains more than 20% of fines, the vibrating screen forms an angle of 20 to 30 ° with the horizontal plane, and the running time of the lump ore on the vibrating screen is 6 to 8 s.
12. A screening method according to claim 8, wherein a material guide chute is arranged below the output end of the vibrating screen, the end of the material guide chute far from the output end of the vibrating screen has a projection on the vibrating screen, the projection of the material guide chute on the horizontal plane includes a first stop point and a second stop point, the second stop point overlaps with the projection on the horizontal plane of the vibrating screen, and the determination of the horizontal distance between the first stop point and the output end of the vibrating screen comprises the following steps:
and determining the height difference between one end of the guide chute close to the output end of the vibrating screen and the output end of the vibrating screen according to the amplitude of the vibrating screen, and determining the horizontal distance between the first dead point and the output end of the vibrating screen by using the guide chute to enable only lump ores with the powder granularity smaller than 5mm to completely enter the guide chute.
CN202010205443.XA 2020-03-20 2020-03-20 Screening system and screening method for wet lump ore containing powder Active CN111375541B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205925927U (en) * 2016-07-13 2017-02-08 山东诚铭建设机械有限公司 Shunting crushing and screening production line
CN208555022U (en) * 2018-06-11 2019-03-01 中国矿业大学 Open coal mine combined sieving device
CN209952981U (en) * 2019-04-24 2020-01-17 广州市同泽实业有限公司 Slag rough grinding system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205925927U (en) * 2016-07-13 2017-02-08 山东诚铭建设机械有限公司 Shunting crushing and screening production line
CN208555022U (en) * 2018-06-11 2019-03-01 中国矿业大学 Open coal mine combined sieving device
CN209952981U (en) * 2019-04-24 2020-01-17 广州市同泽实业有限公司 Slag rough grinding system

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