JP2946168B2 - Ore washing process - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for washing ore, and more particularly to a method for washing ore, which separates fine powder adhering to the surface of a lump ore such as iron ore by washing or sieving. Regarding the processing method.

[0002]

2. Description of the Related Art In a blast furnace, for example, if a large amount of fine powder adheres to the surface of an iron ore to be used, air permeability in the furnace may be impaired and the condition of the furnace may be impaired. Therefore, regulations are made such that the content of fine powder having a size of, for example, 5 mm or less contained in iron ore (lump ore) is reduced to 3% or less. For this reason,
In the blast furnace, when using imported ore sized to a particle size of 5 to 30 mm, fine powder is removed by sieving.

[0003]

The sieving for removing the fine powder adhering to the iron ore is carried out by using a dry type in which iron ore containing dry fine powder is dropped on a screen and sieved. In addition, for example, a wet type in which iron ore containing fine powder mixed in washing water to eliminate generation of dust is sieved through a screen is considered. The apparatus employing such wet sieving employs a thickener method for solid-liquid separation of a mixed liquid after washing as disclosed in Japanese Patent Application Laid-Open No. 49-25557, which is a prior art employing wet classification. It is preferable because the whole equipment is made compact and excellent separation / removal of fine powder is possible.
Then, the present inventor removed iron ore by removing fine powder adhering by a screen type jet washing machine, separated fine powder from the wastewater by a first screen dehydrator, and then separated liquid from the wastewater. A fine powder was separated by a cyclone, and the fine powder separated from the liquid cyclone was sieved by a second screen dehydrator to recover the fine powder step by step. However, in this method, when fine fine powder is sieved by the second screen dewatering machine, very fine ultrafine powder falls from the screen and accumulates at the bottom of the dewatering machine. And the operator must enter the dewatering machine and clean the bottom. In addition, in order to further reduce the size of the equipment, a lower screen for dewatering the washing water from the screen type jet water washer and an upper screen for dewatering the finely divided powder separated by the liquid cyclone are provided. It is also conceivable to employ a dehydrator in which the screen type dehydrators 1 and 2 are integrated vertically, but in this case, the ultrafine powder that has fallen from the upper screen was sieved on the lower screen. There is a concern that the fine particles may adhere to the surface of the fine particles and a circulating system of a relatively large amount of very fine particles may be formed in the facility, although partly. The present invention has been made in view of such circumstances, and it is possible to reduce the frequency of cleaning the bottom of the second screen type dehydrator to be used, improve the operation rate of the entire equipment, and to circulate the ultrafine powder in the equipment. It is an object of the present invention to provide an ore washing method capable of reducing ore.

[0004]

According to the present invention, there is provided a semiconductor device comprising:
In the ore washing method described above, the lump ore containing fine powder is washed by a screen type jet water washer, and the washing water is dehydrated by a first screen type dewaterer to recover fine powder. The discharged washing water from the screen type dehydrator is supplied to a liquid cyclone to separate fine particles, and then the separated fine particles are supplied to a second horizontal or quasi-horizontal screen type dehydrator, A horizontal or quasi-horizontal screen that oscillates while controlling the amplitude and speed is configured so that the fine powder is dewatered and collected while being quasi-granulated. The method for water-washing ore according to claim 2 is the method according to claim 1, wherein the first and second screen-type dewatering machines include a lower screen for dewatering cleaning water from the screen-type jet watering machine, The screen type dewatering machine having the horizontal or quasi-horizontal screen at the upper stage for dewatering the fine powder separated by the liquid cyclone is configured to be employed. The method for water-washing ore according to claim 3 is described in claim 1 or 2.
In the method described above, the washing water discharged from the hydrocyclone is stored in a circulation tank to precipitate contained ultrafine powder, and then recovered by a filter press. The method for washing ore according to claim 4 is as follows:
The method according to any one of claims 1 to 3, wherein the supernatant water in the circulating tank is set to a turbidity of 15% or less, and the circulating tank is circulated for use in the screen type jet washing machine. The method for washing ore according to claim 5 is as follows.
5. The method according to any one of items 4 to 4, wherein the lump ore is humidified by sprinkling water before the lump ore is washed by the screen type jet washing machine. The method for water-washing ore according to claim 6 is the method according to any one of claims 1 to 5, wherein a height of the ore of the second horizontal or quasi-horizontal screen dehydrator is set to the height of the horizontal or quasi-horizontal screen. It is configured to provide an adjustable weir.

[0005]

According to a first aspect of the present invention, there is provided a method for water-washing an ore, wherein in a screen-type jet washing machine, the washing water is vigorously jet-jetted onto a lump ore containing fine powder placed on a screen to remove fine powder. Since the fine ore is washed out, the lump ore from which the fine powder has been removed can be collected without generating dust. On the other hand, the washing water containing the fine powder discharged from the screen-type jet water washer is dehydrated by the first screen-type dehydrator to recover fine powder, and the fine water that could not be recovered by the first screen-type dewaterer is recovered. Wash water containing fine powder is supplied to the hydrocyclone, and fine powder is separated from the wash water. Thereafter, the fine powder is dropped on a horizontal or quasi-horizontal screen of a second horizontal or quasi-horizontal screen dehydrator, and the fine powder is dehydrated and collected here. The fine powder can be separated into solid and liquid according to the particle size with a small amount of water treatment. At this time, the amplitude and speed of the fine powder are controlled in accordance with the amount, moisture content, particle size, etc. of the supplied fine powder, for example, a straight line or a straight line parallel to the moving direction of the fine powder in the vertical plane. It vibrates so as to draw an elliptical trajectory, but during this movement, the surrounding very fine ultrafine particles adhere to the surface of the fine particles in the form of a snowball on the surface of the core. The amount of ultrafine particles falling to the bottom of the quasi-horizontal screen type dehydrator is reduced, and the frequency of cleaning the bottom of this dehydrator can be reduced. Can be improved. In the method for water-washing ore according to claim 2, the lower screen of the screen-type dehydrator uses a screen.
The washing water from the screen type jet washing machine is dewatered to collect fine powder, and the fine or fine powder separated by the liquid cyclone is recovered by dehydration using a horizontal or quasi-horizontal screen at the upper stage of the screen dewatering machine. Therefore, the two dehydrators can be used together to reduce the size of the dehydrator, and the pseudo-granulation of the fine powder causes the fine particles on the lower or horizontal screen to fall down from the upper screen. The amount of the ultrafine powder adhering to the powder is reduced, and the amount of the ultrafine powder circulating in the equipment downstream of the dehydrator can be reduced. In the method for washing ore according to claim 3, the washing water discharged from the liquid cyclone is temporarily stored in a circulation tank to precipitate contained ultrafine particles, and then the ultrafine particles in a slurry state are separated by a filter press. Since the microfine powder in the wash water discharged from the liquid cyclone can be satisfactorily recovered, the generation of the circulating system of the microfine powder in the facility can be almost completely eliminated. In the ore washing method according to claim 4, of the washing water from the hydrocyclone stored in the circulation tank,
By circulating the supernatant water having a turbidity of 15% or less to the screen type jet water washer, water for washing and sieving the lump ore can be effectively circulated and used in the system. In the ore washing method according to the fifth aspect, since the lump ore is humidified by sprinkling water before the lump ore is washed with the screen type jet washing machine, the water content of the lump ore is increased, and the lump ore is subjected to the screen method. The time required for washing with a jet washing machine and sieving with the first and second screen dehydrators is reduced. In the ore washing treatment method according to claim 6, when the washing water from the hydrocyclone is dropped on the horizontal or quasi-horizontal screen of the second horizontal or quasi-horizontal screen dehydrator, the sieved fine particles are removed. The powder moves on a horizontal or quasi-horizontal screen, but hits a weir on the way and stays for a predetermined time. Since this stagnation time is the dewatering time in the horizontal or quasi-horizontal screen dehydrator, a good dehydration effect can be obtained even with a dehydrator having a relatively short screen. In addition, by adjusting the height of the weir, a dewatering time suitable for the properties of the fine powder to be sieved can be freely selected.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; Here, FIG. 1 is an overall configuration diagram of an ore washing apparatus according to an embodiment of the present invention, FIG. 2 is a schematic side view of a screen dehydrator used in the ore washing apparatus, and FIG. FIG. 4 shows a partially cutaway perspective view of a hydrocyclone used in an ore washing apparatus.

[0007] As shown in FIG.
No. 0 has a screen-type jet water washer 15 for washing ore dropped by conveyors 12 to 14 from an existing sizing plant 11 for crushing and sizing iron ore, for example. The ore contains, in order of particle size, lump ore A used in a blast furnace, fine powder B, fine powder C, and ultrafine powder D used as sintering raw materials.
Nos. 2 to 14 are sequentially arranged downward in a stepwise manner. On the conveyor 13, since the amount of water and the time from humidification to washing and sieving affect the separation / removal effect of the fine powder, the water content of the ore being transported is increased by 1-2%. A means for spraying humidified water is provided so as to improve the effect of separating and removing the fine powder. According to the findings of the inventors, 1-2%
It is preferable to perform water washing and sieving within 10 minutes after watering the ore to increase the water content of the ore.

In the screen type jet washing machine 15, an upper screen 15a having a coarse mesh and a lower screen 15b having a dense mesh are horizontally arranged. A number of nozzles for jetting a water jet at a predetermined inclination angle with respect to the screens 15a and 15b from the opposite direction are arranged. The nozzle is provided with an angle adjusting means so that the angle with respect to the surface of the screens 15a and 15b can be changed. The size of the mesh of the upper screen 15a depends on the grain size of the supplied ore.
a and 15b are, for example, about 10 mm in consideration of the washing efficiency and sieving efficiency, and the mesh of the lower screen 15b is, for example, the minimum mesh supplied to the blast furnace as lump ore. Has a roughness of, for example, about 5 mm so that the lump ore A having a size of can be sieved.

[0009] The amount of water of the water jet injected from the nozzle is 0.2 to 0.8 m ³ / t · ore, preferably 0.1 to 0.8 m ³ / t · ore.
4 to 0.6 m ³ / t · ore, and 0.2 m ³ / t ·
If it is less than ore, the separation and removal of the fine powder B is insufficient,
If it exceeds 0.8 m ³ / t · ore, the cost increases. In this embodiment, the upper and lower screens 15a, 15
In the first half of b, it is 0.6 m ³ / t · ore. The water pressure of the water jet is preferably in the range of 196 to 245 kPa, and is set to 245 kPa in the embodiment.
Further, the angle between the nozzle and the surface of the screen 15a, 15b is 20 to 90 degrees, preferably 30 to 60 degrees,
If it is less than 20 degrees or more than 90 degrees, the cleaning efficiency is significantly reduced.

In the latter half of the screens 15a and 15b, draining is performed exclusively, and lump ore A having a water content of, for example, 10% or less and a particle size of 5 mm or more is sieved from the screens 15a and 15b, and conveyers 16 and 17 are removed. Is deposited in the lump ore yard 18. The distance between the tip of the nozzle and the ore on the upper screen 15a is an interval at which the water pressure does not decrease. Thus, the upper and lower screens 15a,
Since the fine powder B is washed away by jetting the washing water from the nozzle to the lump ore 15b on the 15b, no dust is generated when the fine powder B is removed. Next, the solid-liquid separation process of the fine powder group (fine powder B, fine powder C, and ultrafine powder D) separated from the lump ore A by the screen type jet washing machine 15 will be described in detail with reference to FIGS. Will be described.

As shown in FIG. 1, equipment used for the solid-liquid separation step of the fine powder group mainly includes a screen type dehydrator 1 disposed below a screen type jet water washer 15.
9 and the particle size 74 discharged from the screen dehydrator 19
A liquid cyclone 21 comprising a water collecting tank 20 for storing washing water containing fine particles C of not less than μm and a Laval separator for separating the fine particles C precipitated at the bottom of the water collecting tank 20.
A circulating tank 22 for storing washing water containing the ultrafine powder D discharged from the liquid cyclone 21; and a filter press 23 for vacuum-dehydrating the ultrafine powder D precipitated at the bottom of the circulator 22. .

As shown in FIGS. 1 and 2, the screen type dehydrator 19 is a vibration transfer type dehydrator disposed below the screen type jet water washer 15, and is provided with a liquid cyclone 2.
The upper horizontal or quasi-horizontal screen 19a for dehydrating and collecting the fine fine powder C separated in 1 and the washing water containing the fine powder B having a particle diameter of 2 mm or more discharged from the washing machine 15 are dewatered. Thus, a horizontal lower screen 19b for collecting the fine powder B is disposed. In the screen type dehydrator 19, while the amplitude and speed are controlled in accordance with the amount of fine fine powder C supplied, the water content, the particle size, and the like,
For example, a vibrator 19A that simultaneously vibrates the upper and lower screens 19a and 19b so as to draw a straight line or a small elliptical locus in a vertical plane parallel to the moving direction of the fine powder C.
Is attached. Upper and lower screens 19a, 1
The amplitude of 9b is 9-12 mm, preferably 9-10 mm, and the speed is 15-20 m / min, preferably 1-20.
It is 5 to 17 m / min. The frequency of the upper and lower screens 19a and 19b is 600 to 800 times / minute, preferably 600 to 680 times / minute.

In addition, the amount of fine powder C supplied on the screen 19a increases, the water content increases,
When the particle size becomes small, control is performed so that the amplitude is increased and the frequency (speed) is increased.
When the amount of the fine fine powder C supplied above is reduced, the water content is reduced, or the particle size is increased, control is performed so that the amplitude is reduced and the frequency is reduced. It is to be noted that known means such as weight adjustment of an amplitude control counterweight can be applied to control the amplitude of the screens 19a and 19b, and the frequency can be controlled by adjusting the rotation speed of a drive motor of the vibrator 19A. Known means can be applied. By controlling the amplitude and speed in such a range, the fine powder C having a particle size of 74 μm or more can be moved so as to slightly jump on the upper screen 19a. As a result, during the movement of the fine fine powder C, the surrounding extremely fine fine powder D adheres to the surface of the fine fine powder C serving as a core in a snowball manner, and the fine fine powder C becomes pseudo-granules that gradually become larger. Can be changed.

As shown in FIG. 3, the upper screen 19
a is a weir 25 whose height can be adjusted by a bolt connection structure 24 through an elongated hole 24a at three positions, an intermediate portion and an unloading portion.
By adjusting the height of the weir 25, the residence time (dewatering time) of the fine powder C on the screen 19a can be changed. The upper screen 19a is constituted by a plurality of partial screens,
The residence time of the fine powder C on the screen 19a may be changed by inclining each partial screen with an ascending gradient (for example, about ± 5 degrees).

As shown in FIG. 2, the washing water containing fine powder C from the hydrocyclone 21 is supplied to the screen type dehydrator 1.
9, the upper screen 1 passing through the upper inlet 19c.
The fine powder C dropped onto the carry-in portion 9a and sieved is moved by a vibrator 19A while vibrating in a direction parallel to the moving direction of the fine powder C and in a vertical plane so as to draw a straight line or a small elliptical locus. On the way, the residence time, which is a determining factor of the dewatering time, is adjusted by each weir 25, and the sieved fine powder C is carried out from the upper discharge port 19d (see also FIG. 3). In addition, screen type jet water washing machine 1
The washing water containing the fine powder B discharged from 5 falls on the lower screen 19b from the lower input port 19e of the screen type jet water washer 19, and the fine powder B similarly sieved by vibrating conveyance becomes lower. It is discharged from the discharge port 19f.

As shown in FIG. 1, the separated fine powder B and fine powder C are accumulated in the fine powder group yard 28 via the conveyors 26 and 27 together with the fine powder discharged from the sizing plant 11. Is done. Further, the washing water containing the fine and fine powder C discharged from the screen dehydrator 19 is supplied to the collecting tank 2.
Water is stored at 0, and fine powder C precipitates at the bottom. Next, the hydrocyclone 21 will be described in detail with reference to FIGS.

As shown in FIG. 1, as the liquid cyclone 21, two Laval separators, which are solid-liquid separators, are used in series. This hydrocyclone 21
The washing water containing the finely divided powder C precipitated at the bottom of the water collecting tank 20 is caused to flow into the upper chamber 30 shown in FIG.
1 and is adjusted to a rotating vortex having a force of about 7 G by a rotating mechanism. This vortex flows into the separation tube 32
And the fine powder C is primarily separated by a speed difference from the washing water. Furthermore, the vortex is instantaneously decelerated by the lower guide vane mechanism 33, where it is secondarily separated by a difference in shape, a difference in specific gravity, or the like. The separated fine powder C is deposited in the collection chamber 34 while rotating at a low speed, and is dropped on the upper screen 19 a of the screen dehydrator 19. In addition, the vortex of the washing water after the secondary separation simultaneously changes from velocity energy to pressure energy, passes through a low pressure central portion of the downflow, forms a vortex having a different peripheral velocity, and then rises rapidly. And is stored in the circulation tank 22. The washing water stored in the circulation tank 22 contains extremely fine and fine powder D having a particle diameter of less than 74 μm.

In the circulation tank 22, the ultrafine powder D precipitates at the bottom, and the precipitated ultrafine powder D is supplied to the filter press 23 by a pump 36, where the water is removed almost completely by vacuum dehydration. . Filter press 2
3, a small vacuum dehydrator is employed. The ultrafine powder D, which has been dehydrated by the apparatus 23 to form an ultrafine powder cake, is transferred to the fine powder B via conveyors 23a and 27.
The fine powder C is deposited together with the fine powder C in the fine powder group yard 28 and used as a sintering raw material. As described above, since the filter press 23 is used, extremely fine ore can be reliably separated and removed from the washing water. On the other hand, supernatant water having a turbidity of 15% or less in the circulating tank 22 (content ratio of solids in the mixed solution) is sent to the screen type jet washing machine 15 by a pump 37 under pressure, and jet water is jetted from a nozzle. Used as circulation. Such a value of turbidity of 15% or less is a value obtained as a result of various experimental studies. If the turbidity is maintained at 15% or less, it can be recycled as washing water, and continuous operation of the process can be performed. it can.
The turbidity is preferably uniformed by appropriately stirring the circulating water so that the turbidity does not exceed 15% due to the turbidity variation.

Next, an ore washing method according to the present invention using the ore washing apparatus 10 will be described. FIG.
As shown in (1), the ore crushed or sized in the sizing plant 11 is dropped into the screen type jet washing machine 15 by the conveyors 12 to 14. The fine powder group within a range that can be separated in the factory is conveyed by the conveyor 27 to the fine powder group yard 2.
8 is deposited. In the screen type jet water washer 15, jet water is jetted by a nozzle, and the upper and lower screens 15a and 15b provide a water content of 15% or less and a particle size of 5%.
lump ore A having a diameter of not less than 1 mm is sieved, and
Is deposited in the lump ore yard 18. In the example, 44.1% of the fines are separated at this stage.

The washing water containing the fine powder B discharged from the screen type jet water washer 15 is supplied to the screen type dehydrator 1.
9, falls on the lower screen 19 b, is sieved, and is deposited on the fine powder group yard 28 via the conveyors 26 and 27. The washing water containing the fine powder C discharged from the screen dehydrator 19 is temporarily stored in a water collecting tank 20 and stirred so as to have a uniform concentration. It is fed to the cyclone 21 and separated into solid and liquid. The solids discharged from the hydrocyclone 21 are transferred to a screen 19 a in the upper stage of the screen dehydrator 19.
The fine powder C is sieved. The fine-grained powder C has an amplitude,
The speed is controlled, the vibrator 19A moves while slightly jumping on the upper screen 19a which vibrates in a vertical plane and in a straight line or a small elliptical trajectory in parallel with the moving direction of the fine powder C, and moves in the middle. Since the surrounding ultrafine powder D adheres to the surface of the fine powder C in a snowball manner and is quasi-granulated, it passes through this screen 19a and falls on the fine powder B sieved by the lower screen 19b. The amount of the ultrafine powder D to be reduced is reduced. Thereafter, the quasi-granulated fine fine powder C is discharged from the screen type dewatering machine 19 and travels along the same route as the fine powder B to the fine powder group yard 28.
Deposited on

On the other hand, the liquid discharged from the liquid cyclone 21 is stored in a circulation tank 22, and a slurry of ultrafine powder D precipitated at the bottom is supplied to a filter press 23 by a pump 36. Here, the slurry is vacuum-dehydrated to form a very fine powder cake, and is deposited on the fine powder group yard 28 via the conveyors 23a and 27. In addition, the circulation tank 22
The supernatant water having a turbidity of 15% or less is supplied to the screen type jet washing machine 15 by the pump 37 and is circulated and used as washing water, so that water for washing or sieving ore can be effectively circulated and used in the system. .

As described above, the amplitude and speed of the fine fine powder C are controlled in accordance with the amount, water content, particle size, etc. of the fine fine powder C to be supplied. Moreover, while moving while jumping on the upper screen 19a of the screen type dehydrator 19 which vibrates so as to draw a straight line or an elliptical locus in the vertical plane, the surface of the fine powder C which becomes the core is snowballed on the surface. Since the ultrafine powder D adheres and pseudo-granulation as if the particle size of the fine powder C is large is performed, the ultrafine powder D that passes through the upper screen 19a and falls to the bottom of the screen type dehydrator 19 is dropped. The amount of
As a result, the ultrafine powder D which falls down from the upper screen 19a and adheres to the fine powder B on the lower screen 19b
And the amount of ultrafine powder D circulating in the equipment downstream of the screen dehydrator 19 can be reduced. In addition,
A screen dehydrator having a screen 19a at the upper stage (a second horizontal or quasi-horizontal screen dehydrator);
When a screen type dehydrator having the lower screen 19b (first screen type dehydrator) is provided side by side,
By quasi-granulating the fine powder C in this manner, the frequency of cleaning the bottom of the dehydrator can be reduced, and the operation rate of the entire equipment whose operation is stopped every time cleaning can be improved.

In the process of collecting the fine powder group, the fine powder B discharged from the screen-type jet washing machine 15 is recovered by a dewatering process using a lower screen 19b of a screen-type dehydrator 19, and the lower screen 19b is used. The fine powder C that could not be recovered is separated by the liquid cyclone 21 and then recovered by dewatering the upper screen 19a of the screen type dehydrator 19, and the ultrafine powder D in the wash water discharged from the liquid cyclone 21 is filtered. 2
Since the powder is recovered by vacuum dehydration in step 3, solid-liquid separation is performed according to the particle size with a small amount of water treatment, from fine powder B having a relatively large particle size removed from lump ore A to fine powder D having a very fine particle size. In addition, it is possible to make the equipment configuration more compact than the conventional one in which the thickener method is employed for the solid-liquid separation equipment.

Further, since the weir 25 is provided on the upper screen 19a of the screen type dehydrator 19, the fine powder C collides with the weir 25 during the movement and stagnates. Even with the short screen 19a, a good dewatering effect can be obtained. Moreover, this weir 25
Since the height can be adjusted, the dehydration time can be freely selected according to the properties of the finely divided powder C to be sieved. Furthermore,
The lower screen 19b for dewatering the washing water from the screen type jet water washer 15 and the upper screen 1 for dewatering the finely divided powder C separated by the liquid cyclone 21.
By adopting the screen type dehydrator 19 having the components 9b and 9b, two dehydrators can be used as one, and the size of the dehydrator can be reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and any changes in design without departing from the scope of the present invention are included in the present invention. For example, in the embodiment, as the first and second screen dehydrators, a lower screen for dewatering the washing water from the screen type jet water washer and a horizontal or dehydrating fine powder separated by the liquid cyclone are used. Although a screen type dehydrator having a quasi-horizontal upper screen is employed, the present invention is not limited to this, and a second horizontal or quasi-horizontal type having a first screen type dehydrator and a horizontal or quasi-horizontal screen. A screen type dehydrator may be provided side by side.

[0026]

According to the ore washing method of the present invention, the amplitude and speed are controlled according to the amount, moisture content, particle size, etc. of the fine powder to be supplied. The fine powder moves on a horizontal or quasi-horizontal screen that vibrates in a vertical or parallel plane and oscillates in a vertical plane. Since the surrounding ultrafine powder adheres to the surface in the form of a snowball and pseudo-granulation in which the particle size of the fine powder becomes large is performed, the powder passes through a horizontal or quasi-horizontal screen and passes through a second horizontal or quasi-horizontal screen The amount of ultrafine particles falling to the bottom of the dewatering machine is reduced, so that the frequency of cleaning the bottom of the dewatering machine can be reduced, and the operation rate of the whole equipment whose operation is stopped every time cleaning can be improved . In particular, in the ore washing method according to claim 2, a lower screen for dewatering washing water from a screen type jet washing machine, and an upper or horizontal screen for dewatering fine powder separated by the liquid cyclone. By employing a screen type dehydrator having a horizontal screen, one of the two dehydrators can also serve as one, and the size of the dehydrator can be reduced. In addition, the pseudo-granulation of the fine powder reduces the amount of ultrafine powder that falls from the upper horizontal or quasi-horizontal screen and adheres to the fine powder on the lower screen. Ultrafine powder circulating in the equipment can be reduced. In the ore washing method according to the third aspect, the washing water containing the ultrafine particles discharged from the liquid cyclone is stored in the circulation tank, and the ultrafine particles in a slurry state precipitated at the bottom of the tank are collected by a filter press. Therefore, very fine powder can be satisfactorily recovered. In the ore washing method according to the fourth aspect, the supernatant water having the turbidity of 15% or less in the circulation tank is circulated and used in the screen type jet washing machine. Can be used effectively within the circulation. In the ore washing method according to the fifth aspect, since the lump ore is humidified before washing with the screen type jet washing machine, the water content of the lump ore is increased, and then the washing with the screen type jet washing machine is performed. The time for sieving by the screen dehydrator can be reduced. In the ore washing method according to claim 6, since the weir is provided on the horizontal or quasi-horizontal screen of the screen dehydrator, the fine powder sieved by the horizontal or quasi-horizontal screen moves. Since it collides with the weir and stagnates on the way, and the dehydration time becomes longer, a good dehydration effect can be obtained even with a dehydrator having a relatively short screen. In addition, since the height of the weir is adjustable, the dewatering time can be freely selected according to the properties of the fine powder to be sieved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an ore washing treatment apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a screen type dehydrator used in the ore washing treatment apparatus.

FIG. 3 is an enlarged sectional view of a main part of the screen dehydrator.

FIG. 4 is a partially cutaway perspective view of a hydrocyclone used in an ore washing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ore washing treatment apparatus 11 Sizing plant 12 Conveyor 13 Conveyor 14 Conveyor 15 Screen type jet washing machine 15a Upper screen 15b Lower screen 16 Conveyor 17 Conveyor 18 Lump ore yard 19 Screen type dehydrator 19a Upper screen 19b Lower Screen 19c Upper inlet 19d Upper outlet 19e Lower inlet 19f Lower outlet 19A Vibrator 20 Water collecting tank 21 Liquid cyclone 22 Circulating tank 23 Filter press 24 Connection structure 24a Long hole 25 Weir 26 Conveyor 27 Conveyor 28 Fine particle group Yard 29 Pump 30 Upper chamber 31 Straightening hole 32 Separation cylinder 33 Lower guide vane mechanism 34 Collection chamber 35 Separator 36 Pump 37 Pump

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Akinori Kami 1-1-36 Makiyama, Tobata-ku, Kitakyushu-city, Fukuoka Prefecture Inside Hamada Heavy Industries Co., Ltd. (72) Kumi Mitarai 2-1-26-1 Takamatsu, Oita City, Oita Prefecture Room 203, Yamato Building Hamada Heavy Industries, Ltd. Oita Branch (58) Field surveyed (Int.Cl. ⁶ , DB name) B03B 1/00-13/06 C22B 1/00

Claims (6)

(57) [Claims] 1. A lump ore containing fine powder is washed by a screen type jet washing machine, the washing water is dehydrated by a first screen dehydrator to recover fine powder, and then the first screen dewatering is performed. The washing water discharged from the machine is supplied to a liquid cyclone to separate fine powder, and then the separated fine powder is supplied to a second horizontal or quasi-horizontal screen dehydrator so that the amplitude and speed are reduced. A method for washing ore with water, characterized in that the fine or fine powder is dewatered and collected while being quasi-granulated by a horizontal or quasi-horizontal screen which vibrates while being controlled. 2. The first and second screen dehydrators include a lower screen for dewatering washing water from the screen jet water washer and an upper screen for dewatering fine powder separated by the liquid cyclone. The ore washing method according to claim 1, wherein a screen dehydrator having the horizontal or quasi-horizontal screen is employed. 3. The ore according to claim 1, wherein the washing water discharged from the hydrocyclone is stored in a circulation tank to precipitate ultrafine powder contained therein, and then recovered by a filter press. Water treatment method. 4. The ore according to any one of claims 1 to 3, wherein the supernatant water in the circulation tank is turbidized to 15% or less, and is circulated for use in the screen type jet washing machine. Water treatment method. 5. The ore washing method according to claim 1, wherein the lump ore is humidified by sprinkling water before the lump ore is washed by the screen type jet washing machine. . 6. The horizontal or quasi-horizontal screen dehydrator of the second horizontal or quasi-horizontal screen dehydrator is provided with a height-adjustable weir. A water washing treatment method for the ore described in the above.