JP5905191B2 - Flotation processing system - Google Patents

Description

The present invention is, from the processing object such as a cement kiln bleed dust relates floating遊選ore processing system for recovering particular recalled substances such as lead.

In recent years, a technique for recovering a specific recovery target substance such as lead by using a flotation processing technique using dust such as cement kiln extraction dust as a processing target has been developed.
As an example, (A) Calcium sulfate is obtained by mixing a fine powder containing a calcium component and a lead component, water, and sulfuric acid, adjusting the liquidity to pH 1 to 4, and obtaining a slurry containing calcium sulfate as a solid content. A generation step, a lead sulfide generation step in which a slurry containing calcium sulfate and lead sulfide as solid components is obtained by adding a sulfiding agent to the slurry obtained in step (A), and (C) step (B) The lead / calcium separation process of adding floatation agent and foaming agent to the slurry obtained in) and performing flotation to obtain floatation mainly composed of lead sulfide and sedimentation mainly composed of calcium sulfate. And a processing method of fine powder containing a calcium component and a lead component, which is characterized by containing (Patent Document 1).

  As another example, (A) a lead sulfide production step of obtaining a slurry containing lead sulfide, which is a solid component, by mixing fine powder containing a calcium component and a lead component, water, and a sulfurizing agent; B) Sulfuric acid obtained by adding sulfuric acid to the slurry obtained in step (A) to adjust the pH of the slurry to 1.5 to 7.5 to obtain a slurry containing lead sulfide and calcium sulfate as solid components A calcium generation step, a lead sulfide hydrophobization step of hydrophobizing lead sulfide in the slurry by adding a collector to the slurry obtained in (C) step (B), and (D) step (C). Contains a calcium component and a lead component characterized by including a floatation containing lead sulfide and a lead / calcium separation step to obtain a precipitate containing calcium sulfate A method for treating fine powder has been proposed (patent text) 2).

JP 2006-346512 A JP 2008-62169 A

In the flotation process, if the fluctuation in the content of the substance to be recovered in the processing target is not large, set the optimal operating condition at the beginning of the operation, and then collect it without changing the operating condition. It is always possible to obtain a float with high content of the target substance.
However, when the dust obtained by using waste as part of the raw material is treated as a processing target, such as cement kiln bleed dust, the type of waste changes, and the recovery target in the processing target The content of substances (eg lead) always varies, and can vary especially when switching dust lots.

  In the process of processing the material to be recovered as floating ore (for example, lead-containing material), if the content of the material to be recovered is high, a large amount of floating ore is generated in the treatment tank. descend. On the other hand, when the content rate of the recovery target substance is low, the amount of floated ore generated in the treatment tank decreases, so the level of the slurry level increases. When the slurry level rises, the slurry is scraped together with the float and the quality of the recovered material is lowered, so an overflow weir has been installed in the past, and the level of the slurry was limited so that it does not rise above a certain level. . Slurry overflowing from the overflow weir is transferred to the next flotation treatment tank and processed in the same manner.

However, since the slurry overflowing from the overflow weir contains a relatively high content of the recovery target substance, the recovery efficiency in one processing tank is not necessarily sufficient, and conventionally, a plurality of processing tanks are connected. The system separated the floatation containing the substance to be recovered and the sedimentation enriched with other components.

In this way, when the content rate of the recovery target substance in the processing target fluctuates, the floated ore recovered in one flotation treatment tank combines the high recovery rate (quality) and high recovery rate of the recovery target substance. The conventional method has not always been sufficient.
In the present invention, even when the content rate of the recovery target substance in the processing target fluctuates, the floated ore collected in one flotation treatment tank has a high content rate and a high recovery rate of the recovery target substance. and to provide a floating遊選ore processing system Do that shall have.

As a result of intensive investigations to solve the above problems, the present inventor has installed a discharge means capable of controlling the discharge amount of slurry in a diluted portion of the substance to be collected in the flotation treatment tank, and the level of the slurry liquid The present inventors have found that it is effective to control the slurry discharge amount while detecting the above. That is, the present invention is to provide a below.

A flotation processing system for recovering a specific recovery target substance from a slurry containing a processing target as a float, comprising a flotation processing tank that contains the slurry, and a center portion to a bottom of the flotation processing tank Slurry supply means for supplying slurry to the flotation treatment tank downward, air supply means for supplying air to the slurry downward from the center to the bottom of the flotation treatment tank, and the floating A scraping and collecting means provided at an upper portion of the beneficiation treatment tank and collecting the float in the flotation treatment tank, a detection means for detecting the liquid level of the slurry in the flotation treatment tank, and the flotation treatment tank A slurry discharge port installed at the center of the flotation processing tank, which is a dilute part of the recovery target substance, and a discharge amount control means capable of controlling the discharge amount of the slurry discharged from the slurry discharge port, Floating A diffuser provided in a beneficiation treatment tank, wherein air bubbles supplied to the slurry in the flotation beneficiation treatment tank are allowed to pass through the holes formed in the diffuser to allow the bubbles to pass through the slurry. And a partition plate provided in front of the slurry discharge port in the flotation processing tank, and prevents the slurry in the flotation processing tank from being directly discharged to the slurry discharge port, A flow control plate provided in the flotation processing tank and separating an upward flow and a downward flow in the slurry in the flotation processing tank; and the detecting means includes an upper limit liquid level sensor and a lower limit liquid level sensor. The discharge amount control means mixes and agitates the liquid level of the slurry in the flotation processing tank, and the slurry in the flotation processing tank and the air supplied to the slurry. The slurry by The liquid level of the slurry is maintained so that only a layer of levitated material including floats formed on the liquid level is maintained at a liquid level within a certain range so that the scraping and collecting means can scrape and collect. Increases the amount of slurry discharged from the slurry discharge port when the upper limit liquid level sensor is exceeded, and when the liquid level of the slurry falls below the lower limit liquid level sensor, A flotation processing system characterized by controlling to reduce emissions.

ADVANTAGE OF THE INVENTION According to this invention, the collection | recovery target substances (for example, lead) in a process target object (for example, cement kiln extraction dust) can be collect | recovered efficiently. Moreover, even if the content rate of the recovered material fluctuates, the recovered floatation always has a high content rate and high recovery rate of the material to be recovered, and is efficient with a small number of floatation treatment tanks. Can be processed.
The floated ore recovered in the present invention can be used as a non-ferrous refining raw material or the like. Further, the ore recovered in the present invention can be used as a cement raw material or the like.

It is sectional drawing which shows an example of the flotation processing machine used by the flotation process of this invention. It is sectional drawing which shows another example of the flotation processing machine used by the flotation process of this invention. It is a figure which shows notionally an example of the flotation processing system of this invention. It is sectional drawing which shows an example of the flotation processing machine which adjusts the level of the liquid level of a slurry using an overflow weir.

The flotation processing method in the present invention is a method for recovering a specific recovery target substance from a processing target as a flotation, and the liquid level of the slurry in the flotation processing tank is kept within a certain range. As described above, the discharge amount of the slurry discharged from the discharge port installed in the lean portion of the substance to be collected in the flotation processing tank is controlled.

The “dilute part” in the present invention refers to a part where the content rate (concentration) of the recovery target substance in the slurry is low in the flotation treatment tank. As a standard of the content rate, it is 1/2 or less of the content rate of the collection | recovery target substance in the slurry supplied to a flotation processing tank. About this diluted part, it can confirm that it has installed in the appropriate diluted part by measuring the density | concentration of the collection | recovery target substance in the slurry discharged | emitted from the installed discharge port.

Examples of the processing object of the present invention include cement kiln extraction dust, incineration ash, incineration fly ash, molten fly ash and the like. These forms are usually dust (powder).
Cement kiln extracted dust (hereinafter referred to as “extracted dust”) refers to fine powder obtained by cooling a high-temperature exhaust gas extracted from a part of the exhaust gas from the cement kiln. This fine powder is obtained, for example, by collecting the coarse powder in the extracted hot exhaust gas with a cyclone, cooling the exhaust gas not containing the coarse powder after passing through the cyclone, and collecting the cooled exhaust gas with a dust collector such as a bag filter. Obtained by collecting. This fine powder contains calcium, potassium, lead, chlorine and the like.

Examples of the substance to be collected of the present invention include heavy metals such as lead, copper, and zinc, gypsum, and carbon. For example, if lead contained in extracted dust is separated and recovered, it can be used as a non-ferrous refining raw material or the like. Further, if calcium is separated and recovered, it can be used as a cement raw material or the like. In the present invention, since the flotation processing technology is used, lead can be recovered as a float and calcium can be recovered as a deposit.

In this specification, the “floating ore” means particles including a specific substance to be collected that floats on the surface of the foam by flotation.
“Float” means an aggregate of bubbles that floats by flotation. The “floating material” is a layered body formed above the slurry in the liquid tank of the flotation processing machine. “Floating matter” includes liquids forming bubbles and floating ore.
“Precipitation” means solid particles other than “floating ore”.
“Flotation” means a process of separating particles in a slurry into flotation and sedimentation using a flotation processing machine, pretreatment such as hydrophobization before introducing the slurry into the flotation processing machine Not included.
“Flotation treatment” includes flotation and pretreatment such as hydrophobization before the slurry is introduced into the flotation processing machine.

The object to be treated is mixed with water to prepare a slurry. In addition, a flotation aid is added to the slurry. Examples of the flotation aid include a pH adjuster, a sulfiding agent, a hydrophobizing agent, a foaming agent, a flocculant, and a dispersing agent.

Next, a flotation process method according to an embodiment of the present invention will be described with reference to the drawings. In addition, the flotation processing machine shown in FIG.1, FIG2 and FIG.4 is a Fahrenwald type flotation machine. Moreover, the arrow shown as a continuous line shows the flow of a slurry, and the arrow shown with a broken line shows the flow of air.

First, the case where a discharge port is installed in the lower peripheral part which becomes the diluted part of the collection target substance in the flotation processing tank will be described with reference to FIG.
The adjusted slurry S1 is supplied to the liquid tank 2 of the flotation processing machine 1 through the slurry supply pipe 5. At that time, the slurry S1 is supplied downward from the center of the liquid tank 2 toward the bottom. At the same time, the air A1 supplied from the air supply pipe 7 is also jetted downward from the center of the liquid tank toward the bottom through a pipe different from the supplied slurry S1, and becomes air bubbles in the slurry 4. The bubbles are broken at the projections of the air diffuser 8 and become fine, and most of them rise through the holes made in the air diffuser 8. With this mechanism, the bubbles are uniformly dispersed. Since the slurry 4 in the liquid tank 2 is constantly stirred by the stirring blade 6, the bubbles rise mainly along the peripheral edge of the liquid tank 2 while being stirred by the vortex of the slurry 4. In this ascending process, the substance to be collected and the bubbles are combined, and floats as a float. The floated ore forms a layer of levitated material 3 above the slurry. The boundary between the layer of the levitated material 3 and the slurry 4 is the liquid surface 4a of the slurry.

In the present invention, the discharge port 11 of the slurry 4 is installed in the diluted portion of the material to be collected in the flotation processing tank, but one of the diluted portions of the material to be collected in FIG. The outlet 11 for the slurry 4 is installed at the lower peripheral edge of the liquid tank 2. As a result, the slurry S2 discharged from the liquid tank 2 has a lower content rate of the recovery target substance than the conventional overflow weir method, and therefore, the recovery target substance can be efficiently recovered using the flotation processing machine 1. Processing can be performed.

In addition, another diluted portion of the substance to be collected in this embodiment is formed at the center of the flotation treatment tank. The case where the discharge port 11 is installed here is shown in FIG. As for the flow of the slurry 4 in the liquid tank 2, the peripheral part of the liquid tank 2 becomes an upward flow, whereas the central part becomes a downward flow. In the slurry 4 that has risen with the recovery target substance, the recovery target substance is separated as a floatation near the liquid surface 4a of the slurry, so that a lean portion with a low content of the recovery target substance is formed in the downward flow at the center. Is done. It is preferable that a discharge port is installed at the center. In addition, it is effective to install the flow control plate 22 in order to separate the upward flow and the downward flow of the slurry and stably form the lean portion.

On the other hand, in order to stably obtain a high-quality recovery target substance, it is desirable that the scraping blade 9 always rotates above the liquid surface 4a of the slurry so that only the levitated matter is scraped. For this purpose, it is necessary that the liquid level 4a of the slurry is always kept at a constant level. Usually, the supply amount of the slurry 4 is constant and the continuous operation is performed. However, since the content of the collection target substance in the supplied slurry S1 fluctuates, the production amount of the float is increased or decreased accordingly. As a result, the liquid level 4a of the slurry also fluctuates. In order to keep the level of the liquid level 4a of the slurry within a certain range, a method of controlling the discharge amount of the slurry 4 is used.

In the present invention, means for detecting the liquid level 4a of the slurry is provided. On the upper part of the liquid tank 2, a liquid level sensor 10 is provided at an appropriate position according to the scraping position. Usually, the liquid level sensor 10 is provided with two sensors, an upper limit liquid level sensor 10 a and a lower limit liquid level sensor 10 b, so that the level of the slurry liquid level 4 a is maintained between the two liquid level sensors 10. Controlled.
That is, when the liquid level of the slurry exceeds the upper limit liquid level sensor 10a, the discharge amount of the slurry 4 is increased, and the liquid level 4a of the slurry is controlled to fall. Conversely, when the slurry liquid level 4a falls below the lower limit liquid level sensor 10b, the discharge amount of the slurry is reduced and the slurry liquid level is controlled to rise.

As a result, even if the substance to be collected in the supplied slurry S1 fluctuates, the level of the liquid level 4a of the slurry is kept in a certain range in advance, and a high-quality collected substance can be stably obtained as a float. Is possible. Furthermore, since the discharged slurry S2 is a slurry having a low concentration of the recovered substance, it is possible to recover the processing object more efficiently in a small flotation processing tank.

The slurry S2 discharged from the liquid tank 2 is supplied to the next liquid tank arranged in series and processed in the same manner. Finally, the sediment is separated and removed, and then treated as waste water.

The flotation processing system in the present invention is a flotation processing system for recovering a specific recovery target substance from a slurry containing a processing target as a flotation, the flotation processing tank containing the slurry, and the flotation processing tank Slurry supply means for supplying slurry to the beneficiation treatment tank, air supply means for supplying air to the slurry, recovery means for recovering the float ore, detection means for detecting the liquid level of the slurry, and the flotation process A slurry discharge port provided in the lower part of the tank and a discharge amount control means capable of controlling the discharge amount of the slurry are provided.

In the present invention, one flotation processing tank or a plurality of flotation processing tanks arranged in series is used. According to the method of the present invention, it is possible to process with high recovery efficiency even in one flotation processing tank, but it is necessary to recover the recovery target substance in the slurry with a higher recovery rate, or to process the deposit with high quality. When there is, a plurality of flotation processing tanks can be used. Note that “arranged in series” means that the slurry containing the processing object is floated in the first tank and then guided to the second tank and floated in the second tank. Flotation beneficiation can be repeated sequentially from the first tank located on the most upstream side toward the other downstream flotation treatment tanks, such as being led to three tanks and being subjected to flotation in the third tank. This means that a plurality of flotation processing tanks are arranged.

The slurry supply means includes means (not shown) for sending a predetermined amount of slurry S1 and a slurry supply pipe 5. As a means for sending the slurry S1, a liquid feed pump or the like can be used, but a means using gravity may be used and is not particularly limited.
The slurry supply pipe 5 is connected to a pipe installed in the central part of the liquid tank 2, and the slurry S1 is installed so as to be supplied from the central part of the tank bottom through this pipe. The installation position of the slurry supply pipe 6 is not particularly limited, and the slurry supply pipe 6 is installed so as to efficiently generate floating ore by mixing with air.

The air supply means includes means (not shown) for feeding a predetermined amount of air A1 and an air supply pipe 7. As a means for sending air A1, a compressed air cylinder, a compressor, or the like can be used.
The air supply pipe 7 is connected to a pipe installed in the center of the liquid tank 2 separately from the pipe through which the slurry passes, and the air is supplied to the bottom of the liquid tank 2 through this pipe. It is installed to be. In addition, although an air supply position is not specifically limited, In order to mix appropriately with the slurry 4 and to generate floating ore efficiently, supplying from the lower part of the liquid tank 2 is preferable.
In addition, fine air bubbles (such as microbubbles) that have been adjusted in advance can be used as the supplied air. In that case, the air supply position is set as appropriate. It can also be supplied in advance to the slurry S1 before being introduced into the flotation processing tank.

The air diffuser 8 is for making the supplied air A1 into fine bubbles, like a flange, with several holes opened at the same distance from the center of the disk, and several convexes attached downward. It consists of parts. Further, the air diffuser 8 is designed to be sufficiently large with respect to the inner diameter of the liquid tank 2. However, it is not always necessary to install fine bubbles adjusted in advance.

The means for collecting the floating ore is not particularly limited as long as it is a means that can collect the floating ore in the floated material, but the scraping blade 9 or the like is suitable. The position of the scraping blade 9 is preferably adjustable as appropriate.

The liquid level detecting means is not particularly limited as long as it can know the liquid. For example, a capacitive pencil liquid level sensor, an ultrasonic liquid level sensor, a float type liquid level sensor, or the like is used. . Usually, the liquid level sensor 10 is composed of an upper limit liquid level sensor 10a for detecting the upper limit of the slurry liquid level 4a and a lower limit liquid level sensor 10b for determining the lower limit. The liquid level sensor 10 is connected to the discharge amount control means, and the level information 4a on the liquid level of the slurry is transmitted to the discharge amount control device 15.
In addition to the liquid level sensor 10, an overflow weir (not shown) may be provided at a position higher than the liquid level sensor 10 in order to prevent the slurry from overflowing from the liquid tank 2.

The discharge port 11 of the slurry 4 is installed in a lean portion of the substance to be collected in the flotation processing tank. Depending on the configuration of the flotation processing machine such as supply of slurry or air, generally, the lower part or the central part of the flotation processing tank is often a lean part. In the embodiment of the present invention, the lower peripheral edge portion or the central portion is a lean portion. In addition, the discharge port 11 can also be attached to two places, the lower peripheral part and center part of a flotation processing tank.

Further, a partition plate 13 is provided in front of the discharge port 11 as necessary. (See FIG. 1) Thereby, even if the supply port of the slurry S1 is near, it is possible to prevent a part of the slurry 4 with insufficient separation of the recovery target substance from being discharged directly.
Moreover, when installing the discharge port 11 in the lean part of a center part, it is suitable for the flow control board 22 (refer FIG. 2) to be installed. Thereby, the slurry upward flow at the peripheral portion and the slurry downward flow at the central portion are clearly separated, and more efficient processing can be performed. The structure of the flow control plate 22 is not particularly limited, and a combination of several plates or a cylindrical shape can be used. Further, as shown in the figure, it is more preferable to install it obliquely with a predetermined inclination angle.

The discharge amount control means 12 may be any device that can control the slurry discharge amount by receiving information from the liquid level sensor 10, and an inverter-controlled liquid feed pump or the like is suitable. Also, a combination of a valve that can be opened and closed and a flow meter may be used.

Next, a cement extraction dust processing system including the above-described flotation processing system will be described with reference to FIG.
In FIG. 3, the extraction dust processing system of the present invention includes a slurry preparation tank 31 for preparing extraction slurry by mixing extraction dust and water, and sulfide such as sodium hydrosulfide in the slurry obtained in the slurry preparation tank 31. The sulfuric acid is added to the slurry obtained in the sulfiding agent addition tank 32 and the sulfiding agent addition tank 32 for obtaining a slurry containing lead sulfide, which is a solid component, and the pH is adjusted to 2-7. The sulfuric acid addition tank 33 for obtaining a slurry containing calcium sulfate and lead sulfide, and the hydrophobicity for hydrophobizing the lead sulfide by adding a hydrophobizing agent such as xanthate to the slurry obtained in the sulfuric acid addition tank 33 From the flotation processing units 35, 36, 37 arranged in series and the flotation processing units 36, 37 for the flotation of the slurry obtained in the hydrophilizing agent addition tank 34 and the hydrophobizing agent addition tank 34 In the slurry preparation tank 31, And a floating object returning means for returning the yield has been floated (e.g., conduit with the pump).

Hereinafter, the present invention will be described based on examples. However, the present invention is not limited to these examples, and various modifications can be made within the scope of the claims.

[Example 1]
(1) Processing object Extraction dust (Ca: 20 mass%, Pb: 5.4 mass%) was used as a processing object.
(2) Flotation process The flotation process was performed as follows using the processing system shown in FIG.
In the slurry preparation tank 31, the extracted dust was suspended in water so that the solid-liquid ratio (dust: water mass ratio) was 1:10 to prepare a slurry.
Next, pretreatment of flotation was performed on the obtained slurry. Specifically, the slurry was guided to the sulfiding agent addition tank 32, and sodium hydrosulfide (NaSH) corresponding to the amount of lead contained in the extracted dust was added to produce lead sulfide in the slurry. Next, the obtained slurry was introduced into the sulfuric acid addition tank 33, and sulfuric acid was added to adjust the pH to 3. Thereafter, the obtained slurry was guided to a hydrophobizing agent addition tank 34, and xanthate was added as a hydrophobizing agent to hydrophobize the surface of the lead sulfide particles.
Next, the slurry S1 is placed in a 200-liter capacity flotation processing machine (first tank) 35 (having the structure shown in FIG. 1) having a slurry discharge port installed at the lower peripheral edge, and 500 liters / hr. At a flow rate of. When the slurry 4 in the liquid tank 2 (refer to the reference numeral in FIG. 1) reached about 1/3, the air A1 was supplied from the air supply pipe 7, and the stirring blade 6 and the diffuser panel 8 were operated. When the level 4a of the slurry exceeded the level of the lower limit level sensor, the discharge amount control of the slurry S2 was started. The rotational speed of the scraping blade collected by the levitated material 3 was set to 20 rpm.
The slurry discharged from the discharge port of the flotation processing machine (first tank) 35 is introduced into the flotation processing machine (second tank) 36 having the same structure as the flotation processing machine (first tank) 35, Similarly, flotation was performed. Furthermore, the slurry discharged from the discharge port of the flotation processing machine (second tank) 36 was introduced into a flotation processing tank machine (third tank) 37 having the same structure, and flotation was similarly performed. The floated material scraped by the flotation processing machine (second tank) 36 and the flotation processing machine (third tank) 37 was returned to the slurry preparation tank 31.
Then, the mass per unit time and the content of lead in the floated matter (dry matter) in the floated material collected by the flotation processing machine (first tank) 35 were measured, and the recovered floated ore was determined from these measured values. The quality (lead content) was calculated. Moreover, the mass per unit time of the sedimentation (dry matter) recovered by the flotation processing machine (first tank) 35, the flotation processing machine (second tank) 36, and the flotation processing machine (third tank) 37 And the content of lead was measured, and the content rate of lead in the collected sediment was calculated from these measured values. In addition, the recovery rate of lead is the floatation (dry matter) in the levitated matter collected by the flotation processing machine (first tank) 35 and the sedimentation (drying) collected by the flotation treatment machine (third tank) 37. The mass per unit time and the lead content were measured and calculated from these measured values. The results are shown in Table 1.

[Example 2]
An experiment was conducted in the same manner as in Example 1 except that a flotation treatment tank having a slurry discharge port 11 installed at the center of the flotation treatment tank (having the structure shown in FIG. 2) was used. The results are shown in Table 1.

[Comparative example]
An experiment was conducted in the same manner as in Example 1 except that a flotation treatment tank having a liquid level adjusted by the overflow weir 43 (having the structure shown in FIG. 4) was used. The results are shown in Table 1.

From Table 1, it can be seen that in Example 1, the lead recovery rate in the first tank is 99% by mass, and the lead content in the float in the first tank is as high as 60% by mass. Moreover, it turns out that the content rate of lead in the sedimentation in the 1st tank is as low as 0.2 mass%.
Also in Example 2, it turns out that the recovery rate of the lead in a 1st tank is as high as 99 mass% and the content rate of the lead in the float in the 1st tank is as high as 64 mass%. Moreover, it turns out that the content rate of lead in the sedimentation in the 1st tank is as low as 0.2 mass%.
On the other hand, in the comparative example, it can be seen that the lead recovery rate in the first tank is as low as 95% by mass, and the lead content in the float in the first tank is as low as 44% by mass. Moreover, the content rate of the lead in the sedimentation in the 1st tank is as high as 1.1 mass%. The lead content in the ore is almost the same in the third tank.
From this result, it was found that the flotation processing method in the present invention can efficiently recover lead with a small number of flotation processing tanks.

DESCRIPTION OF SYMBOLS 1 Flotation processing machine 2 Liquid tank 3 Floating matter 4 Slurry 4a Slurry liquid level 5 Slurry supply pipe 6 Stirring blade 7 Air supply pipe 8 Diffuser 9 Scraping blade 10 Liquid level sensor 10a Upper limit liquid level sensor 10b Lower limit Liquid level sensor 11 Slurry outlet
12 Slurry discharge adjustment device 13 Partition plate 21 Flotation processing machine 22 Flow control board 31 Slurry preparation tank 32 Sulfide addition tank 33 Sulfuric acid addition tank 34 Hydrophobic agent addition tank 35 Flotation process machine (first tank)
36 Flotation processing machine (second tank)
37 Flotation processing machine (3rd tank)
41 Flotation processing machine 42 Opening 43 Overflow weir S1 Slurry supplied S2 Slurry discharged A1 Air supplied

Claims (1)

A flotation processing system for recovering a specific recovery target substance as a float from a slurry containing a processing target,
A flotation processing tank containing the slurry;
Slurry supply means for supplying the slurry to the flotation processing tank downward from the center to the bottom of the flotation processing tank;
Air supply means for supplying air to the slurry downward from the center of the flotation processing tank toward the bottom ;
Scraping and collecting means provided at an upper portion of the flotation processing tank and recovering the flotation in the flotation processing tank;
Detecting means for detecting the liquid level of the slurry in the flotation processing tank;
A slurry discharge port installed at the center of the flotation processing tank, which is a dilute portion of the substance to be collected in the flotation processing tank ;
A discharge amount control means capable of controlling the discharge amount of the slurry discharged from the slurry discharge port;
An air diffuser provided in the flotation processing tank, wherein the air bubbles supplied to the slurry in the flotation processing tank are passed through holes formed in the air diffuser to pass the bubbles. A diffuser to disperse in the slurry;
A partition plate provided in front of the slurry discharge port in the flotation processing tank, and preventing the slurry in the flotation processing tank from being directly discharged to the slurry discharge port;
A flow control plate provided in the flotation treatment tank and separating an upward flow and a downward flow in the slurry in the flotation treatment tank ;
The detection means includes an upper limit liquid level sensor and a lower limit liquid level sensor,
The discharge amount control means mixes and agitates the liquid level of the slurry in the flotation processing tank and the slurry in the flotation processing tank and the air supplied to the slurry. The liquid level of the slurry is maintained so that only a layer of levitated material including floats formed on the liquid level is maintained at a liquid level within a certain range so that the scraping and collecting means can scrape and collect. There increased emissions slurry from the slurry outlet port in the case of exceeding the upper limit liquid level sensor, the liquid level of the slurry in the slurry from the slurry outlet port when falls below the lower limit liquid level sensor A flotation processing system characterized by controlling to reduce emissions.

Images