WO2015156009A1 - 上澄み水排出装置 - Google Patents
上澄み水排出装置 Download PDFInfo
- Publication number
- WO2015156009A1 WO2015156009A1 PCT/JP2015/051509 JP2015051509W WO2015156009A1 WO 2015156009 A1 WO2015156009 A1 WO 2015156009A1 JP 2015051509 W JP2015051509 W JP 2015051509W WO 2015156009 A1 WO2015156009 A1 WO 2015156009A1
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- WIPO (PCT)
- Prior art keywords
- submersible pump
- water level
- water
- supernatant water
- supernatant
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2444—Discharge mechanisms for the classified liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0018—Separation of suspended solid particles from liquids by sedimentation provided with a pump mounted in or on a settling tank
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2427—The feed or discharge opening located at a distant position from the side walls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/30—Control equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/30—Control equipment
- B01D21/307—Passive control mechanisms without external energy, e.g. using a float
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/30—Control equipment
- B01D21/34—Controlling the feed distribution; Controlling the liquid level ; Control of process parameters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
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- 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
Definitions
- the present invention relates to a supernatant water discharging apparatus. More specifically, for example, the present invention relates to a supernatant water discharge device for discharging the supernatant water of a tailing dam to a return water pound.
- High-pressure pressurization is a high-pressure acid leaching method (HPAL: High Pressure Pressure Acid Leaching) using sulfuric acid as a hydrometallurgical process for recovering valuable metals such as nickel and cobalt from low-grade nickel oxide ores such as limonite ore.
- HPAL High Pressure Pressure Acid Leaching
- a sulfuric acid leaching method is known.
- slurry to be discharged outside the system generated in the manufacturing process is processed in a large sedimentation basin such as a tailing dam (mineral dam).
- a tailing dam the solid content in the slurry is gravity settled and deposited at the bottom of the dam.
- the supernatant water of the tailing dam is discharged into a return water pond (static pond), further left still, and discharged outside the system.
- thickener is known as an apparatus for processing slurry.
- the thickener includes a thickener main body having a cylindrical outer frame and a conical bottom having a deep central portion, and a rake that rotates inside the thickener main body.
- the solid content in the slurry supplied to the thickener body is agglomerated, settled and compressed by the addition of a flocculant, gravity sedimentation, and the stirring action of the lake, and is deposited at the bottom. Solids are withdrawn from the bottom and the supernatant is withdrawn from the overflow line.
- the thickener can efficiently process the slurry in a relatively short time.
- nickel grade is about 1% by weight
- most of the treated ore is discharged, so a large amount of slurry is generated and the amount of supernatant water discharged is very high. To be more.
- a thickener is used to process a large amount of slurry in this way, the equipment cost increases.
- the hydrometallurgical plant selects a valley-like topography that is almost the same size as the production area, for example, builds a tailing dam by blocking the exit of the valley, and creates a tailing dam. Smelting facilities will be constructed adjacent to each other. And the slurry discharged
- tailing dam deposits solids in the slurry only by gravity sedimentation, a sufficient residence time is required. For this reason, it is not possible to adopt an overflow method used for thickeners for discharging supernatant water.
- a pump is used to discharge the supernatant water of the tailing dam to the return water pond.
- tailing dams and return water ponds are constructed outdoors, they are greatly affected by weather fluctuations.
- guerrilla heavy rains concentrated heavy rains that are difficult to predict with weather forecasts
- rainfall of several hundred mm / hour continues for several hours. If there is a heavy rain, the water level of the return water pound rises and overflows, and the surrounding facilities may be flooded.
- Patent Document 1 discloses a technique for lowering a submersible pump following a drop in water level by providing a floating member in the submersible pump. Since the submersible pump follows the water level, the height of the submersible pump can be adjusted accurately. However, it is not considered that the return water pound constructed outdoors will overflow due to torrential rain.
- an object of the present invention is to provide a supernatant water discharge device that can prevent a sedimentation basin from overflowing due to heavy rain. It is another object of the present invention to provide a supernatant water discharge device that can prevent a pump failure due to suction or emptying of solid content.
- the supernatant water discharge device is a supernatant water discharge device for discharging the supernatant water of the first sedimentation basin to the second sedimentation basin, and includes a submersible pump, an anemometer, and humidity provided in the first sedimentation basin.
- a weather observation device comprising one or more of a gauge, a thermometer, and a rain gauge, and a control device for stopping the submersible pump when a measurement value of the weather observation device reaches a weather threshold.
- the supernatant water discharge device according to a second aspect of the present invention is characterized in that, in the first aspect, the meteorological observation device is provided in the submersible pump.
- a supernatant water discharge device includes, in the first aspect of the invention, a water level sensor that measures the water level of the second settling basin, and the control device is configured to perform the above operation when the measured value of the water level sensor reaches a water level threshold value. The submersible pump is stopped.
- a supernatant water discharging apparatus according to the first aspect, further comprising a levitation member that causes the submersible pump to float so as to be positioned below the water surface of the first settling basin.
- a supernatant water discharge device is the first invention, wherein the submersible pump floats on the water surface of the first settling basin, and is provided in the submersible pump, up to the deposit of the first settling basin.
- a distance sensor for measuring a distance wherein the control device stops the submersible pump when a measured value of the distance sensor reaches a distance threshold value.
- the distance sensor is a non-contact type sensor.
- the submersible pump since the submersible pump is stopped when the measured value of the weather observation device reaches the weather threshold value, it is possible to predict concentrated heavy rain and stop the discharge of the supernatant water to the second sedimentation basin. Therefore, it is possible to prevent the second sedimentation basin from overflowing due to torrential rain.
- the weather observation device and the submersible pump are integrated, so that handling is easy.
- the submersible pump is stopped when the measured value of the water level sensor reaches the water level threshold value, so that it is possible to keep a margin for the rise of the water level under normal conditions, and the second precipitation due to the heavy rain.
- the submersible pump moves up and down following the water level of the first settling basin by the levitation member, so that the suction port does not come out of the liquid level, and failure of the submersible pump due to emptying can be prevented. Moreover, since the submersible pump is located in water, the temperature rise by direct sunlight can be suppressed and the malfunction of a submersible pump can be suppressed.
- the submersible pump moves up and down following the water level of the first sedimentation basin by the levitation member, so that the suction port does not come out of the liquid level, and the malfunction of the submersible pump due to emptying can be prevented. Further, since the submersible pump is stopped when the measured value of the distance sensor reaches the distance threshold value, the submersible pump can be stopped when deposits approach the submersible pump due to a decrease in water level or an increase in deposition height. Therefore, the failure of the submersible pump due to the suction of the solid content can be prevented. According to the sixth aspect of the invention, since it is a non-contact type distance sensor, it is possible to accurately measure the distance to a very soft deposit.
- High pressure acid leaching is a high pressure acid leaching method (HPAL) as a hydrometallurgical process for recovering valuable metals such as nickel and cobalt from low-grade nickel oxide ores such as limonite ore.
- a sulfuric acid leaching method is known.
- the pretreatment step (1), the high temperature pressurized sulfuric acid leaching step (2), the neutralization step (3), and the impurity removal step (4), a sulfurization step (5), and a final neutralization step (6) are included.
- nickel oxide ore is crushed and classified to produce ore slurry.
- sulfuric acid leaching step (2) sulfuric acid is added to the ore slurry obtained in the pretreatment step (1), and stirred at 220 to 280 ° C. to obtain high temperature pressure acid leaching to obtain a leaching slurry.
- the neutralization step (3) the leaching slurry is neutralized and the leaching residue is discharged.
- the impurity removal step (4) hydrogen sulfide gas is added to the leachate obtained in the neutralization step (3) to precipitate and remove zinc as zinc sulfide, and the impurities are discharged as impurity residues.
- a sulfiding agent is added to the leaching solution after removing the impurities obtained in the impurity removing step (4) to obtain a nickel / cobalt mixed sulfide, and the nickel poor solution is discharged.
- the slurry obtained by mixing the leaching residue discharged in the neutralization step (3), the impurity residue discharged in the impurity removal step (4), and the nickel poor solution discharged in the sulfidation step (5) is the final neutralization step ( 6).
- the final neutralization step (6) the slurry is neutralized and then discharged as the final slurry.
- the final slurry discharged from the final neutralization step (6) is solid-liquid separated by a tailing dam.
- the solid content in the final slurry is gravity settled and deposited at the bottom of the dam.
- the supernatant water of the tailing dam is discharged to the return water pond, left still, and discharged outside the system. Waste water discharged from the return water pond is repeatedly recycled to the hydrometallurgical recycle water or discharged.
- the tailing dam D (also referred to as an ore dam) is a large sedimentation basin constructed by damming a valley-shaped terrain exit.
- the slurry discharged from the smelting equipment (final slurry in FIG. 4) is first processed by the tailing dam D.
- the slurry is solid-liquid separated into the sediment S and the supernatant water W by gravity sedimenting the solid content in the slurry and depositing it on the bottom of the dam. Since the deposit S deposited at the bottom of the dam is not discharged, the height of the deposit S (deposition height) gradually increases. Further, the water level of the tailing dam D always fluctuates depending on the amount of wastewater treated (the amount of slurry supplied to the tailing dam D, the amount of supernatant water discharged from the tailing dam D).
- the supernatant water W of the tailing dam D is discharged by the supernatant water discharge device A and supplied to the return water pound P.
- the return water pound P (also referred to as a stationary pond) is a settling pond constructed outdoors.
- the supernatant water W is left outside by the return water pump P and then discharged out of the system.
- the tailing dam D and the return water pond P correspond to the “first sedimentation basin” and the “second sedimentation basin” described in the claims, respectively.
- the first sedimentation basin and the second sedimentation basin are not limited to the tailing dam D and the return water pound P, and may be any sedimentation basins that perform solid-liquid separation by sedimenting solids by gravity sedimentation.
- the supernatant water discharge device A is preferably applied to discharge the supernatant water W as described above to the return water pound P.
- the supernatant water discharging device A includes a submersible pump 10 provided in the tailing dam D and a flexible hose 20 connected to the submersible pump 10.
- the supernatant water W sucked by the submersible pump 10 is guided by the flexible hose 20, discharged outside the tailing dam D, and supplied to the return water pound P.
- the submersible pump 10 moves up and down following the water level of the tailing dam D.
- the flexible hose 20 is made of a flexible material such as hard vinyl.
- the submersible pump 10 includes a suction port 11, a discharge pipe 12, and a motor 13. By driving the motor 13, the supernatant water W can be sucked from the suction port 11 and discharged from the discharge pipe 12.
- the discharge pipe 12 is connected to one end of the flexible hose 20 via the connection pipe 21.
- the submersible pump 10 is provided with a levitation member 30 and is levitated on the water surface of the tailing dam D.
- the levitation member 30 includes a housing 31 in which the submersible pump 10 is housed, and a float 32 fixed to the housing 31.
- the casing 31 is made of a material through which a liquid such as a wire mesh can flow, and the supernatant water W flows into the casing 31.
- the float 32 is not particularly limited as long as a desired buoyancy can be obtained. Styrofoam, a metal can, or the like is used.
- the shape of the float 32 is not particularly limited, and may be cylindrical or spherical.
- the levitation member 30 only needs to have a buoyancy that causes the submersible pump 10 to float so that at least the suction port 11 is positioned below the water surface.
- the supernatant water W can be sucked by positioning the suction port 11 below the water surface.
- the levitation member 30 is configured to float so that the entire submersible pump 10 is positioned directly below the water surface. Since the tailing dam D is outdoors, the submersible pump 10 is exposed to sunlight. However, with such a configuration, since the submersible pump 10 is located in the water, the temperature rise due to direct sunlight can be suppressed and the water can be cooled, and failure of the submersible pump 10 can be suppressed. Moreover, even if an unexpected overheating phenomenon occurs in the submersible pump 10, the water pump is cooled, so that the malfunction of the submersible pump 10 can be suppressed.
- the water level of the tailing dam D always fluctuates depending on the wastewater treatment amount.
- the submersible pump 10 since the submersible pump 10 is levitated on the water surface of the tailing dam D by the levitation member 30, it moves up and down following the water level of the tailing dam D. Therefore, the suction port 11 does not come out of the liquid level, and the submersible pump 10 can be prevented from malfunctioning due to emptying.
- a distance sensor 41 is fixed to the casing 31 of the levitation member 30 near the bottom thereof. That is, the distance sensor 41 is fixed to the submersible pump 10 via the levitation member 30 and moves up and down together with the submersible pump 10.
- “provided in the submersible pump” described in the claims means that the distance sensor 41 is indirectly provided through another member such as the floating member 30 in addition to the form in which the distance sensor 41 is provided directly in the submersible pump 10. Forms provided are also included.
- the measuring direction of the distance sensor 41 is directed downward, and the distance sensor 41 is configured to measure the distance to the deposit S deposited on the bottom of the tailing dam D. Therefore, the distance between the submersible pump 10 and the deposit S can be measured by the distance sensor 41.
- the distance sensor 41 is not particularly limited as long as it can measure the distance to the deposit S, and may be a non-contact type such as an optical type or a sonic type, or a contact type. However, it is preferable to use a non-contact type distance sensor 41.
- the deposit S formed by depositing solid content in the discharged slurry is very fine clay, and the surface of the deposit S is very It is weak. This is because the distance to the very soft deposit S can be accurately measured by using the non-contact type distance sensor 41.
- the controller 50 is connected to the submersible pump 10 and can control the on / off of the motor 13, that is, the drive / stop of the submersible pump 10.
- the control device 50 and the distance sensor 41 are connected by wire or wirelessly, and the measurement value of the distance sensor 41 is input to the control device 50.
- the control device 50 stores a lower limit value (distance threshold value) of the distance between the submersible pump 10 and the deposit S.
- the control device 50 stops the submersible pump 10 when the measured value of the distance sensor 41 reaches the distance threshold (when the distance is below the distance threshold). Therefore, when the submersible pump 10 gets too close to the deposit S, the submersible pump 10 can be stopped.
- the water level of the tailing dam D constantly fluctuates, and the submersible pump 10 moves up and down following the water level of the tailing dam D. Further, the height (deposition height) of the deposit S deposited on the bottom of the tailing dam D gradually increases. For this reason, if the submersible pump 10 gets too close to the deposit S due to a decrease in the water level or an increase in the deposition height, the solid content is sucked and causes a failure.
- the submersible pump 10 since the submersible pump 10 is stopped when the measured value of the distance sensor 41 reaches the distance threshold value, the submersible pump 10 can be stopped when the deposit S approaches the submersible pump 10 due to a decrease in the water level or an increase in the deposition height. . Therefore, failure of the submersible pump 10 due to the suction of the solid content can be prevented.
- the distance threshold is set to a sufficient distance that the submersible pump 10 does not suck the solid content.
- the distance from the suction port 11 of the submersible pump 10 to the deposit S is set to 30 cm.
- control apparatus 50 drives the submersible pump 10 when the measured value of the distance sensor 41 exceeds a distance threshold value.
- An anemometer 42 is provided at the top of the casing 31 of the levitation member 30. That is, the anemometer 42 is provided in the submersible pump 10 via the levitation member 30.
- “provided in the submersible pump” described in the claims means that the anemometer 42 is indirectly provided through another member such as the levitation member 30 in addition to the form in which the anemometer 42 is provided directly in the submersible pump 10. Forms provided are also included.
- the wind speed (wind force) around the submersible pump 10 can be measured by the anemometer 42.
- An increase in wind speed is an indication that heavy rains will occur in areas around the tailing dam D and the return water pond P.
- wind speed increases when torrential rain occurs. Therefore, the anemometer 42 can predict the occurrence of torrential rain.
- the control device 50 and the anemometer 42 are connected by wire or wirelessly, and the measured value of the anemometer 42 is input to the control device 50.
- the control device 50 stores an upper limit value of the wind speed (wind speed threshold).
- the control device 50 stops the submersible pump 10 when the measured value of the anemometer 42 reaches the wind speed threshold value (when the wind speed threshold value is exceeded). Therefore, the submersible pump 10 can be stopped in advance when concentrated heavy rain is predicted.
- the tailing dam D and the return water pond P are constructed outdoors, rainwater flows in and the water level rises when a heavy rain occurs.
- the return water pound P is managed with a high water level in order to make the residence time as long as possible. Therefore, when the water level of the return water pound P rises due to the heavy rain, the water overflows and the surrounding facilities may be flooded.
- the submersible pump 10 is stopped when the measured value of the anemometer 42 reaches the wind speed threshold value, the discharge of the supernatant water W to the return water pound P can be stopped by predicting the heavy rain. Therefore, it is possible to prevent the return water pound P from overflowing due to the heavy rain.
- the wind speed threshold is set to a wind force that is expected to blow during heavy rain, for example, a wind speed of 15 m / sec.
- control apparatus 50 drives the submersible pump 10 when the measured value of the anemometer 42 falls below the wind speed threshold value.
- the anemometer 42 and the wind speed threshold correspond to the “meteorological observation device” and the “weather threshold” described in the claims, respectively.
- a weather observation apparatus a hygrometer, a thermometer, a rain gauge, etc. other than the anemometer 42 may be used.
- the control device 50 stores an upper limit value of humidity (humidity threshold value).
- humidity threshold value an upper limit value of humidity
- the control device 50 stops the submersible pump 10 when the measured value of the hygrometer reaches the humidity threshold value (when the humidity threshold value is exceeded).
- thermometer When using a thermometer as a meteorological observation device, a drop in temperature is used as a sign that a torrential rain will occur.
- the control device 50 stores a lower limit value (temperature threshold value) of the temperature.
- the control device 50 stops the submersible pump 10 when the measured value of the thermometer reaches the temperature threshold (when the temperature falls below the temperature threshold).
- a sudden increase in rainfall is used as a criterion for torrential rain.
- the upper limit of rainfall is stored in the control device 50.
- the control device 50 stops the submersible pump 10 when the measurement value of the rain gauge reaches the rainfall threshold value (when the rainfall threshold value is exceeded).
- an anemometer 42, a hygrometer, a thermometer, and a rain gauge may be used alone as the weather observation device, or a plurality of these may be used in combination.
- the meteorological observation device may be provided near the tailing dam D or the return water pond P, and may be provided, for example, on the embankment of the tailing dam D. If the submersible pump 10 is provided as in the present embodiment, the meteorological observation device and the submersible pump 10 are integrated, so that handling is easy. However, when the weather observation device is provided in the submersible pump 10, it is preferable to use the anemometer 42 as the weather observation device. If a hygrometer, a thermometer, or a rain gauge is installed near the water surface, there is a risk of malfunction. Because.
- the return water pound P is provided with a water level sensor 43 for measuring the water level.
- the type of the water level sensor 43 is not particularly limited as long as the water level of the return water pound P can be measured.
- the control device 50 and the water level sensor 43 are connected by wire or wirelessly, and the measurement value of the water level sensor 43 is input to the control device 50.
- the control device 50 stores an upper limit value (water level upper limit value) of the return water pound P.
- the “water level upper limit value” corresponds to the “water level threshold value” recited in the claims.
- the control device 50 stops the submersible pump 10 when the measured value of the water level sensor 43 reaches the water level upper limit value (when the water level upper limit value is exceeded).
- the water level can be managed with a margin for the rise in the water level.
- the maximum rising water level is assumed to be 1 m.
- the water level upper limit value is set to a water level that is lower than the upper end of the return water pound P (upper limit of water overflow) by the maximum rising water level (1 m). If it does so, since it maintains with the water level which has a margin to the upper end of the return water pound P in normal time, even if a heavy rain occurs and water level rises, it can prevent that water overflows.
- the control device 50 stores the lower limit value (water level lower limit value) of the return water pound P, and the measured value of the water level sensor 43 is the water level lower limit value. It is only necessary to drive the submersible pump 10 when the pressure reaches the lower limit (when the water level falls below the lower limit).
- the water level lower limit value is set to a lower water level than the water level upper limit value. Further, the water level lower limit value is set as high as possible in order to lengthen the residence time of the return water pound P.
- the water level of the return water pound P can be maintained between the water level upper limit value and the water level lower limit value by setting the water level upper limit value and the water level lower limit value.
- the set values of the water level upper limit value and the water level lower limit value are not particularly limited, and may be determined in consideration of the size of the tailing dam D and the return water pound P and the climate in the surrounding area.
- the water level upper limit value and the water level upper limit value may be set to 90% and 80% of the capacity of the return water pound P, respectively.
- control device 50 controls the driving / stopping of the submersible pump 10 based on the measured values of the distance sensor 41, the anemometer 42, and the water level sensor 43.
- the control device 50 includes an electronic circuit such as a CPU, and includes an input unit from each sensor 41, 42, 43 and an output unit to the submersible pump 10.
- measured values of the distance sensor 41, the anemometer 42, and the water level sensor 43 are input to the control device 50.
- the control device 50 drives the submersible pump 10 when all the measured values of the distance sensor 41, the anemometer 42, and the water level sensor 43 are values that may drive the submersible pump 10.
- the control device 50 stops the submersible pump 10 when any of the measured values of the distance sensor 41, the anemometer 42, and the water level sensor 43 is a value at which the submersible pump 10 should be stopped. That is, the control device 50 controls the driving / stopping of the submersible pump 10 based on the result of the AND operation.
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Abstract
Description
スラリー中の固形分はダム底部に徐々に堆積するため、堆積高さは徐々に上昇する。ポンプの吸込口に堆積物が接近すると、ポンプが固形分を吸引してしまい故障の原因となる。また、テーリングダムの水位は排水処理量によって常に変動する。水位が低下してポンプの吸引口が液面から出てしまうと、ポンプが空気を吸い込む空引き状態となり故障の原因となる。
しかし、屋外に構築されるリターンウォーターポンドが集中豪雨により溢れ出すことは考慮されていない。
また、固形分の吸引や空引きによるポンプの故障を防止できる上澄み水排出装置を提供することを目的とする。
第2発明の上澄み水排出装置は、第1発明において、前記気象観測装置は、前記水中ポンプに設けられていることを特徴とする。
第3発明の上澄み水排出装置は、第1発明において、前記第2沈殿池の水位を測定する水位センサを備え、前記制御装置は、前記水位センサの測定値が水位閾値に達した場合に前記水中ポンプを停止させることを特徴とする。
第4発明の上澄み水排出装置は、第1発明において、前記水中ポンプが前記第1沈殿池の水面下に位置するように浮揚させる浮揚部材を備えることを特徴とする。
第5発明の上澄み水排出装置は、第1発明において、前記水中ポンプを前記第1沈殿池の水面に浮揚させる浮揚部材と、前記水中ポンプに設けられ、前記第1沈殿池の堆積物までの距離を測定する距離センサと、を備え、前記制御装置は、前記距離センサの測定値が距離閾値に達した場合に前記水中ポンプを停止させることを特徴とする。
第6発明の上澄み水排出装置は、第5発明において、前記距離センサは、非接触式のセンサであることを特徴とする。
第2発明によれば、気象観測装置と水中ポンプが一体になっているので、取り扱いが容易である。
第3発明によれば、水位センサの測定値が水位閾値に達した場合に水中ポンプを停止させるので、平常時では水位の上昇に対して余裕をもたせた状態にでき、集中豪雨により第2沈殿池の水位が上昇しても溢れ出すことを防止できる。
第4発明によれば、浮揚部材により水中ポンプが第1沈殿池の水位に追従して上下動するので、吸引口が液面から出ることがなく、空引きによる水中ポンプの故障を防止できる。また、水中ポンプが水中に位置しているため、直射日光による温度上昇を抑えることができ、水中ポンプの故障を抑制できる。
第5発明によれば、浮揚部材により水中ポンプが第1沈殿池の水位に追従して上下動するので、吸引口が液面から出ることがなく、空引きによる水中ポンプの故障を防止できる。また、距離センサの測定値が距離閾値に達した場合に水中ポンプを停止させるので、水位の低下や堆積高さの上昇により水中ポンプに堆積物が接近すると水中ポンプを停止できる。そのため、固形分の吸引による水中ポンプの故障を防止できる。
第6発明によれば、非接触式の距離センサであるので、非常に軟弱な堆積物までの距離を正確に測定できる。
<湿式製錬>
まず、ニッケル酸化鉱石からニッケル・コバルト混合硫化物を得る湿式製錬を説明する。
リモナイト鉱等に代表される低品位ニッケル酸化鉱石からニッケル、コバルト等の有価金属を回収する湿式製錬法として、硫酸を用いた高圧酸浸出法(HPAL: High Pressure Acid Leaching)である高温加圧硫酸浸出法が知られている。
つぎに、テーリングダムおよびリターンウォーターポンドを説明する。
図1に示すように、テーリングダムD(鉱滓ダムとも称される。)は、谷状の地形の出口を堰き止めて構築された大型の沈殿池である。製錬設備から排出されたスラリー(図4における最終スラリー)は、まずテーリングダムDで処理される。テーリングダムDではスラリー中の固形分を重力沈降させてダム底部に堆積させることにより、スラリーを堆積物Sと上澄み水Wとに固液分離する。ダム底部に堆積した堆積物Sは排出されないため、堆積物Sの高さ(堆積高さ)は徐々に上昇する。また、テーリングダムDの水位は排水処理量(テーリングダムDへのスラリー供給量、テーリングダムDからの上澄み水排出量)によって常に変動する。
本発明の一実施形態に係る上澄み水排出装置Aは、上記のようなテーリングダムDの上澄み水WをリターンウォーターポンドPに排出するのに好ましく適用される。
水中ポンプ10は、浮揚部材30が設けられており、テーリングダムDの水面に浮揚されている。浮揚部材30は、水中ポンプ10が納められる筐体31と、筐体31に固定された浮き32とからなる。筐体31は金網等の液体が流入できる素材で構成されており、筐体31の内部に上澄み水Wが流入するようになっている。浮き32は所望の浮力が得られるものであれば特に限定されず、発泡スチロールや金属缶等が用いられる。浮き32の形状も特に限定されず、円柱状であってもよいし、球状であってもよい。
浮揚部材30の筐体31にはその底部付近に距離センサ41が固定されている。すなわち、距離センサ41は浮揚部材30を介して水中ポンプ10に固定されており、水中ポンプ10とともに上下動する。なお、特許請求の範囲に記載の「水中ポンプに設けられ」は、距離センサ41が水中ポンプ10に直接的に設けられる形態のほかに、浮揚部材30等の他の部材を介して間接的に設けられる形態も含まれる。
浮揚部材30の筐体31にはその上部に風速計42が設けられている。すなわち、風速計42は浮揚部材30を介して水中ポンプ10に設けられている。なお、特許請求の範囲に記載の「水中ポンプに設けられ」は、風速計42が水中ポンプ10に直接的に設けられる形態のほかに、浮揚部材30等の他の部材を介して間接的に設けられる形態も含まれる。
図1に示すように、リターンウォーターポンドPにはその水位を測定する水位センサ43が設けられている。水位センサ43はリターンウォーターポンドPの水位を測定できれば、その種類は特に限定されない。
以上のように、制御装置50は、距離センサ41、風速計42、水位センサ43の測定値を元に、水中ポンプ10の駆動/停止を制御する。制御装置50は、CPUなどの電子回路等で構成されており、各センサ41、42、43からの入力部、および水中ポンプ10への出力部を備える。
P リターンウォーターポンド
A 上澄み水排出装置
10 水中ポンプ
11 吸引口
12 吐出管
13 モータ
20 フレキシブルホース
21 接続管
30 浮揚部材
31 筐体
32 浮き
41 距離センサ
42 風速計
43 水位センサ
50 制御装置
Claims (6)
- 第1沈殿池の上澄み水を第2沈殿池に排出する上澄み水排出装置であって、
前記第1沈殿池に設けられた水中ポンプと、
風速計、湿度計、温度計、雨量計のうちの一または複数からなる気象観測装置と、
前記気象観測装置の測定値が気象閾値に達した場合に前記水中ポンプを停止させる制御装置と、を備える
ことを特徴とする上澄み水排出装置。 - 前記気象観測装置は、前記水中ポンプに設けられている
ことを特徴とする請求項1記載の上澄み水排出装置。 - 前記第2沈殿池の水位を測定する水位センサを備え、
前記制御装置は、前記水位センサの測定値が水位閾値に達した場合に前記水中ポンプを停止させる
ことを特徴とする請求項1記載の上澄み水排出装置。 - 前記水中ポンプが前記第1沈殿池の水面下に位置するように浮揚させる浮揚部材を備える
ことを特徴とする請求項1記載の上澄み水排出装置。 - 前記水中ポンプを前記第1沈殿池の水面に浮揚させる浮揚部材と、
前記水中ポンプに設けられ、前記第1沈殿池の堆積物までの距離を測定する距離センサと、を備え、
前記制御装置は、前記距離センサの測定値が距離閾値に達した場合に前記水中ポンプを停止させる
ことを特徴とする請求項1記載の上澄み水排出装置。 - 前記距離センサは、非接触式のセンサである
ことを特徴とする請求項5記載の上澄み水排出装置。
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AU2015245133A AU2015245133B2 (en) | 2014-04-11 | 2015-01-21 | Supernatant water discharge device |
CA2922389A CA2922389C (en) | 2014-04-11 | 2015-01-21 | Supernatant water discharge device |
EP15776056.2A EP3034144B1 (en) | 2014-04-11 | 2015-01-21 | Supernatant water discharge device |
US14/909,999 US9950283B2 (en) | 2014-04-11 | 2015-01-21 | Supernatant water discharge device |
CN201580001772.XA CN106413835B (zh) | 2014-04-11 | 2015-01-21 | 上清水排出装置 |
PH12016500363A PH12016500363B1 (en) | 2014-04-11 | 2016-02-23 | Supernatant water discharge device |
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JP2014081529A JP5790825B1 (ja) | 2014-04-11 | 2014-04-11 | 上澄み水排出装置 |
JP2014-081529 | 2014-04-11 |
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EP (1) | EP3034144B1 (ja) |
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CN (1) | CN106413835B (ja) |
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CN113562786A (zh) * | 2021-07-20 | 2021-10-29 | 浙江浙能嘉华发电有限公司 | 一种移动浸没式清液回收装置及方法 |
CN114562008A (zh) * | 2022-03-01 | 2022-05-31 | 济南市章丘区市政工程处 | 一种市政道路排水系统 |
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AU2015245133B2 (en) | 2016-04-21 |
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EP3034144A4 (en) | 2017-05-31 |
CA2922389C (en) | 2016-08-16 |
PH12016500363A1 (en) | 2016-05-02 |
JP5790825B1 (ja) | 2015-10-07 |
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PH12016500363B1 (en) | 2016-05-02 |
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