JP2018096917A - Characteristics measuring device and method for flowing liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a characteristics measuring device for measuring the characteristics of a flowing liquid, the device requiring only a small installation space.SOLUTION: A characteristics measuring device 1 includes: a horizontal tube 20 forming a part of a flow passage in which a flowing liquid flows; a closed plate 60 through the lower part of the horizontal tube 20, the closed plate forming a liquid storage unit 22 for storing the flowing liquid in the horizontal tube 20 by closing the lower part of the horizontal tube 20; and a measurement unit 50 for measuring the characteristics of the flowing liquid, the measurement unit having a detection unit 53 in the liquid storage part 22. Because the horizontal tube 20, which forms a part of the flow passage, is provided with the measurement unit 50, the installation space can be reduced.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a characteristic measurement apparatus and characteristic measurement method for a fluid. More particularly, the present invention relates to an apparatus and method for measuring characteristics of a fluid flowing through a flow path, such as a redox potential, pH, and concentration.

  In a nickel sulfate crystal production plant, a raw material slurry containing nickel sulfide is supplied to an autoclave and nickel is leached under high temperature and pressure. Since the leachate discharged from the autoclave has a high temperature and a high pressure, it is reduced in pressure in the flash tank, cooled in the cooling tank, and then supplied to the next process apparatus.

  The redox potential of the leachate is used as an index of reactivity in the autoclave. When the redox potential of the leachate is lower than the control reference value, it is determined that the reactivity is reduced. In this case, the leaching reaction is promoted by reducing the supply amount of the raw material slurry to the autoclave and increasing the residence time of the raw material slurry in the autoclave. Further, an oxidizing agent is added to the leachate in the cooling tank to raise the redox potential of the leachate.

  Conventionally, the redox potential of the leachate has been measured by sampling the leachate discharged from the flash tank and measuring it with an offline desktop redox potential meter. In this measurement method, the redox potential of the leachate can be monitored only at predetermined time intervals. For this reason, it may take time until the oxidation-reduction potential of the leachate is detected and then detected. In this case, a state where the redox potential of the leachate deviates from the control reference value is left for a long time. Therefore, it is required to constantly monitor the redox potential of the leachate.

  Patent Document 1 discloses an acid concentration continuous measurement device that continuously measures the acid concentration of a pickling solution. Patent Document 2 discloses a measuring device for measuring the characteristics of a chemical solution. However, these measuring devices are relatively large devices and require an installation space. Since there is not enough space between the flash tank and the cooling tank, such a large measuring device cannot be installed.

JP 2000-313978 A JP 2003-185537 A

  In view of the above circumstances, an object of the present invention is to provide a characteristic measuring apparatus for a fluid having a small installation space and a characteristic measuring method using the characteristic measuring apparatus.

A fluid liquid characteristic measuring apparatus according to a first aspect of the present invention comprises a part of a flow path through which a liquid liquid flows, a horizontally disposed horizontal pipe, a downstream side of the horizontal pipe, and a lower portion of the horizontal pipe A measuring plate which is provided so as to be closed so as to form a liquid reservoir portion in which the fluid liquid is accumulated in the horizontal pipe, and a detection portion is disposed in the liquid reservoir portion, and measures the characteristics of the fluid fluid. And.
According to a second aspect of the present invention, there is provided the fluid liquid characteristic measuring apparatus according to the first aspect, further comprising a downstream pipe connected to the downstream side of the horizontal pipe, wherein the closing plate is interposed between the flange of the horizontal pipe and the flange of the downstream pipe. It is characterized by being pinched.
According to a third aspect of the invention, in the first or second aspect of the invention, the apparatus for measuring liquid fluid characteristics includes an upstream pipe connected to the upstream side of the horizontal pipe, and the upstream pipe is bent so that the upstream end is positioned above the downstream end. It is characterized by that.
A fluid liquid characteristic measuring apparatus according to a fourth aspect of the present invention is the first, second or third aspect of the present invention, comprising: a discharge pipe connected to the lower surface of the horizontal pipe for discharging solid matter from the liquid reservoir; and the discharge pipe. And a valve that opens and closes.
According to a fifth aspect of the present invention, there is provided a fluid liquid characteristic measuring apparatus comprising: the downstream pipe connected to the downstream side of the horizontal pipe; and the lower surface of the horizontal pipe and the downstream pipe. A discharge pipe for discharging an object and a valve for opening and closing the discharge pipe are provided.
According to a sixth aspect of the invention, in the first, second, third, fourth, or fifth invention, the flow path is configured to remove the liquid discharged from the flash tank that depressurizes the liquid discharged from the autoclave. It is a flow channel that flows.
According to a seventh aspect of the present invention, there is provided a method for measuring a property of a fluid, wherein the property of the fluid is measured using the property measuring device according to the first, second, third, fourth, fifth or sixth invention. To do.

According to the first aspect of the present invention, since the measuring instrument is provided in the horizontal pipe that constitutes a part of the flow path, the installation space can be reduced.
According to the second invention, since the closing plate is sandwiched between the flange of the horizontal pipe and the flange of the downstream pipe, the structure is simple and the apparatus can be miniaturized.
According to the third invention, since the upstream pipe is bent, a recess is formed between the blocking plate and the upstream pipe, and the state in which the liquid is stored in the liquid reservoir can be maintained.
According to the fourth aspect of the present invention, it is possible to suppress the solid matter from continuing to accumulate in the liquid reservoir even when the solid matter is contained in the fluid.
According to 5th invention, the solid substance discharged | emitted by the discharge pipe can be supplied to the apparatus of a post process with a fluid.
According to the sixth aspect of the invention, it is safe because the characteristics of the high-temperature fluid discharged from the flash tank can be measured without manual intervention.
According to the seventh aspect, since the characteristics of the fluid can be constantly monitored, it is possible to quickly cope with a case where the liquid crystal deviates from the management reference value.

It is explanatory drawing of a part of manufacturing plant of a nickel sulfate crystal | crystallization. It is a front view of the characteristic measuring apparatus of the fluid concerning one embodiment of the present invention. It is a fragmentary longitudinal cross-sectional view of the characteristic measuring apparatus. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. It is process drawing of the manufacturing process of a nickel sulfate crystal | crystallization.

Next, an embodiment of the present invention will be described with reference to the drawings.
The fluid liquid characteristic measuring apparatus 1 according to an embodiment of the present invention is an apparatus that measures the characteristics of a fluid liquid. Here, the “fluid” means a liquid that flows through the flow path. In addition to liquids that do not contain solids, fluids include slurries that are mixtures of liquids and solids. “Characteristic” means physical and chemical properties of the fluid and includes redox potential, pH, concentration, and the like. Although the use of the characteristic measuring apparatus 1 is not specifically limited, below, the case where it uses for the manufacturing plant of a nickel sulfate crystal | crystallization is demonstrated to an example.

(Nickel sulfate crystal production process)
Next, a process for producing nickel sulfate crystals will be described with reference to FIG.
A nickel-cobalt mixed sulfide (MS) is used as a raw material. Nickel-cobalt mixed sulfide is a high pressure acid leaching (HPAL) of nickel oxide ore such as low-grade laterite ore, removing impurities such as iron from the leachate, and then blowing hydrogen sulfide gas into the leachate It is obtained by causing a sulfurization reaction.

  The nickel / cobalt mixed sulfide is mainly composed of a sulfide such as NiS. The nickel / cobalt mixed sulfide is in the form of fine powder, and its particle size is D50 (number average 50% particle size) of 90 μm or less. The D50 is measured by a laser analysis / scattering method. The chemical composition of the nickel / cobalt mixed sulfide is 45 to 50% by weight of Ni, 4 to 6% by weight of Co, and 35 to 39% by weight of S (all based on the dry amount). The nickel / cobalt mixed sulfide contains impurities such as Fe, Cu, and Zn.

In the pressure leaching step, a slurry (raw material slurry) containing nickel / cobalt mixed sulfide is pressure leached with an autoclave. High pressure air is supplied to the autoclave. The leaching conditions are, for example, a gauge pressure of 1.8 to 2.0 MPa and a temperature of 140 to 180 ° C. By the pressure leaching, nickel, cobalt and other impurities contained in the nickel / cobalt mixed sulfide are leached to obtain a leachate. A part of iron contained in the nickel / cobalt mixed sulfide generates hematite (Fe ₂ O ₃ ) and becomes a leaching residue. Therefore, the leachate discharged from the autoclave is a slurry containing a leach residue that is a solid.

The pressure leaching reaction is expressed by the following formulas 1 and 2.
NiS + 2O ₂ → Ni ²⁺ + SO ₄ ^2- (Formula 1)
CoS + 2O ₂ → Co ²⁺ + SO ₄ ²⁻ (Formula 2)

  The leachate discharged from the autoclave is depressurized to atmospheric pressure by the flash tank and then cooled to below 60 ° C. by the cooling tank. The pH of the leachate is 1.0-1.5. The composition of the leachate is 110 to 130 g / L for Ni, 5 to 15 g / L for Co, and 0.5 to 1.5 g / L for Fe.

  Since pressure leaching in an autoclave is an oxidation reaction, the reactivity of pressure leaching is monitored by measuring the redox potential of the leaching solution. The management reference value of the redox potential of the leachate is set to 450 mV (Ag / AgCl electrode reference), for example. When the redox potential of the leachate is lower than the control reference value, it is determined that the reactivity is reduced. In this case, the leaching reaction is promoted by reducing the supply amount of the raw material slurry to the autoclave and increasing the residence time of the raw material slurry in the autoclave. Further, an oxidizing agent is added to the leachate in the cooling tank to raise the redox potential of the leachate.

  In the iron removal step, neutralization is performed by adding a neutralizing agent to the leachate to remove impurities contained in the leachate, mainly iron as neutralized starch. As the neutralizing agent, for example, slaked lime is used. The crude nickel sulfate aqueous solution after iron removal contains cobalt and the like.

  In the solvent extraction step, cobalt and impurities are removed from the crude nickel sulfate aqueous solution by solvent extraction to obtain a high purity nickel sulfate aqueous solution. The solvent extraction step includes an extraction stage, a washing stage, an exchange stage, a nickel recovery stage, a cobalt recovery stage, and a back extraction stage. In the extraction stage, nickel in the high-purity nickel sulfate aqueous solution is extracted into an organic phase to obtain a nickel-retaining organic phase. In the washing stage, the nickel-retaining organic phase is washed with a washing solution containing nickel. In the exchange stage, the washed nickel-retaining organic phase is brought into contact with the crude nickel sulfate aqueous solution to replace nickel in the nickel-retained organic phase and impurities in the crude nickel sulfate aqueous solution, thereby obtaining a high-purity nickel sulfate aqueous solution. The organic phase obtained in the exchange stage is sent to a nickel recovery stage, a cobalt recovery stage, and a back extraction stage to recover nickel supported on the organic phase, recover cobalt, and remove impurities. The cleaned organic phase is fed to the extraction stage.

  In the crystallization process, a high-purity nickel sulfate aqueous solution is concentrated using a crystallization facility, and nickel sulfate crystals are recovered.

(Characteristic measuring device)
Next, the characteristic measuring apparatus 1 of the present embodiment will be described.
As shown in FIG. 1, the nickel sulfate crystal manufacturing plant includes a flash tank F and a cooling tank T. The supply port Fa of the flash tank F is supplied with high-temperature and high-pressure leachate discharged from an autoclave (not shown). The leachate pressure-lowered in the flash tank F is discharged from the discharge port Fb.

  The cooling tank T is disposed below the flash tank F. The leachate discharged from the flash tank F is supplied to the supply port Ta of the cooling tank T through the flow path. Here, the leachate flows from the flash tank F toward the cooling tank T by the water head. This is because it is difficult to use the pump for transferring the leachate because cavitation occurs when the boiled leachate is transferred by the pump.

  The characteristic measuring apparatus 1 of this embodiment is provided between the flash tank F and the cooling tank T, and constitutes a part of the flow path of the leachate. Here, the “flow path” is a flow path for flowing the leachate discharged from the flash tank F. Further, the leachate corresponds to the “fluid” described in the claims.

  As shown in FIG. 2, the characteristic measuring apparatus 1 includes an upstream pipe 10, a horizontal pipe 20, and a downstream pipe 30. These pipes 10, 20, and 30 are connected in this order from the upstream side to the downstream side, and constitute a part of the flow path through which the leachate flows.

  The horizontal tube 20 is arranged so that the central axis is horizontal. Here, the term “horizontal” is not limited to the meaning of being strictly horizontal, but includes a case where the liquid storage portion 22 described later is formed to be substantially horizontal.

  The upstream pipe 10 is connected to the upstream side of the horizontal pipe 20. The upstream pipe 10 includes a first upstream pipe 11 and a second upstream pipe 12. The horizontal pipe 20 has a larger diameter than the first upstream pipe 11. The second upstream pipe 12 has a tapered shape with a small diameter at the upstream end and a large diameter at the downstream end, and connects the first upstream pipe 11 and the horizontal pipe 20 without a step.

  The second upstream pipe 11 is bent upward. Therefore, the upstream pipe 10 has an upstream end located above the downstream end. The upstream end of the upstream pipe 10 is connected to the discharge port Fb of the flash tank F (see FIG. 1). The upstream end of the upstream pipe 10 and the discharge port Fb of the flash tank F may be directly connected without passing through other pipes, or may be indirectly connected through other pipes.

  The downstream pipe 30 is connected to the downstream side of the horizontal pipe 20. The downstream pipe 30 includes a first downstream pipe 31 and a second downstream pipe 32. The horizontal pipe 20 has a larger diameter than the second downstream pipe 32. The first downstream pipe 31 has a tapered shape with a large diameter at the upstream end and a small diameter at the downstream end, and connects the horizontal pipe 20 and the second downstream pipe 32 without a step.

  The second downstream pipe 32 is bent halfway and droops. The downstream end of the downstream pipe 30 is connected to the supply port Ta of the cooling tank T (see FIG. 1). The downstream end of the downstream pipe 30 and the supply port Ta of the cooling tank T may be directly connected without passing through other pipes, or may be indirectly connected through other pipes.

  The upstream end of the discharge pipe 40 is connected to the lower surface of the horizontal pipe 20. The downstream end of the discharge pipe 40 is connected to the hanging part of the second downstream pipe 32. That is, the discharge pipe 40 connects the lower surface of the horizontal pipe 20 and the downstream pipe 30. The discharge pipe 40 is provided with a valve 41 that opens and closes the discharge pipe 40.

  The horizontal tube 20 is provided with a measuring device 50. The measuring device 50 is not particularly limited as long as it measures liquid properties, and examples thereof include an oxidation-reduction potentiometer, a pH meter, and an ion concentration meter. As will be described later, the measuring device 50 measures the characteristics of the leachate by immersing the detector in the leachate. Therefore, as the measuring instrument 50, an immersion type measuring instrument, in particular, an immersion type electrode measuring instrument is used. The submerged electrode type meter has a detection unit in which a metal electrode and an aqueous solution for forming a salt bridge are enclosed in a glass cell. An electrode-type measuring instrument measures the characteristics of a liquid from a potential difference generated between electrodes. Electrode measuring instruments include oxidation-reduction potentiometers and conductivity meters that directly measure the liquid characteristics from the potential difference, as well as the measured potential difference based on the correlation between the potential difference and the liquid characteristics. There are a pH meter and an ion concentration meter for conversion.

  As shown in FIG. 3, a closing plate 60 is provided on the downstream side of the horizontal pipe 20. The closing plate 60 is sandwiched between the flange 21 of the horizontal pipe 20 and the flange 33 of the first downstream pipe 31. A pair of packings 61 and 61 are provided between the flange 21 of the horizontal pipe 20 and the flange 33 of the first downstream pipe 31. The closing plate 60 is sandwiched between a pair of packings 61 and 61. Thereby, the liquid-tightness of the connection part of the horizontal pipe 20 and the 1st downstream pipe 31 is ensured.

  As shown in FIG. 4, the closing plate 60 has a disc shape as a whole. The diameter of the blocking plate 60 is larger than the inner diameter of the horizontal tube 20 and has a size for closing the horizontal tube 20. A semicircular opening 63 is formed in the upper portion of the closing plate 60. The leachate flows from the horizontal pipe 20 to the first downstream pipe 31 through the opening 63. Therefore, the flow of the leachate is not completely obstructed by the closing plate 60. The shape of the opening 63 is not limited to a semicircle, and may be a circle or a rectangle. On the other hand, a lower portion of the closing plate 60 is a weir portion 64. The lower portion of the horizontal pipe 20 is closed by the weir portion 64.

  The closing plate 60 is provided with an arm 65. When assembling the characteristic measuring apparatus 1, specifically, when the closing plate 60 is assembled between the horizontal pipe 20 and the first downstream pipe 31, the arm 65 is used to align the closing plate 60.

  As shown in FIG. 3, the lower part of the horizontal pipe 20 is closed by the closing plate 60, thereby forming a liquid reservoir 22 in which the leachate is stored inside the horizontal pipe 20. Here, the liquid reservoir 22 means a portion of the internal space of the horizontal pipe 20 that is lower than the upper edge of the weir portion 64 of the closing plate 60.

  The flow rate of the leachate flowing through the horizontal tube 20 is such that a gas phase portion is generated inside the horizontal tube 20. Moreover, the liquid level in the horizontal pipe 20 may be lowered depending on the flow rate of the leachate. However, in this embodiment, since the lower part of the horizontal pipe 20 is closed by the closing plate 60, the liquid level in the horizontal pipe 20 can be maintained higher than the upper edge of the weir part 64. That is, the leachate can be stored in the liquid reservoir 22. The liquid level in the horizontal pipe 20 can be adjusted by changing the size and shape of the opening 63 of the closing plate 60.

  Further, in the present embodiment, since the upstream pipe 10 is bent upward, a recess is formed between the closing plate 60 and the upstream pipe 10. Therefore, the state where the leachate is stored in the liquid reservoir 22 can be maintained. Even if the upstream pipe 10 is not bent upward, the liquid reservoir 22 is formed on the upstream side of the closing plate 60 by the flow of the leachate. Therefore, the configuration in which the upstream pipe 10 is bent upward is not essential.

  On the upper surface of the horizontal pipe 20, a measuring instrument pipe 23 for attaching the measuring instrument 50 is provided. A fixture 51 of the measuring instrument 50 is fixed to the flange at the upper end of the measuring instrument pipe 23 with bolts and nuts. A main body 52 of the measuring instrument 50 attached to the fixture 51 hangs down through the measuring instrument piping 23. A detection unit 53 at the tip of the main body 52 is disposed in the liquid reservoir 22. Therefore, the detector 53 can be immersed in the leachate stored in the liquid reservoir 22, and the characteristics of the leachate can be measured by the measuring device 50.

  In addition, the attachment structure of the measuring device 50 is not limited to the above, and any structure may be used as long as the detection unit 53 is disposed in the liquid reservoir 22. For example, the loose structure which has a clearance gap between the measuring device 50 and the horizontal pipe | tube 20 like the measuring device 50 simply suspended from the upper part may be sufficient.

  As described above, the leachate is a slurry containing leach residues. Therefore, solid matter accumulates in the liquid reservoir 22. However, by opening the valve 41 provided in the discharge pipe 40, the solid matter deposited together with the leachate in the liquid reservoir 22 can be discharged. Therefore, even if solid matter is contained in the leachate, it is possible to prevent the solid matter from continuing to accumulate in the liquid reservoir 22 by periodically opening the valve 41. The valve 41 is normally closed.

  The position of the valve 41 is preferably close to the horizontal pipe 20. This is because the amount of solid deposits can be reduced. Moreover, it can suppress that the discharge pipe 40 is obstruct | occluded with solid substance. The opening and closing of the valve 41 may be performed manually or automatically. If an automatic valve is used as the valve 41 and the valve 41 is opened at a predetermined time interval by setting a timer, solids can be discharged periodically.

  The downstream end of the discharge pipe 40 is connected to the downstream pipe 30. Therefore, the solid substance discharged | emitted by the discharge pipe 40 can be supplied to the cooling tank T with a leaching solution. In the first place, the solid matter is contained in the leachate, and the leachate flowing through the downstream pipe 30 contains the solid matter. Therefore, it is not necessary to separately process the solid matter discharged from the discharge pipe 40. By adopting a configuration in which the discharge pipe 40 is connected to the downstream pipe 30, it is not necessary to separately provide a device for processing solid matter.

  As described above, the characteristic measuring device 1 has a configuration in which the measuring device 50 is provided in the horizontal tube 20 that constitutes a part of the flow path, and thus the installation space can be reduced. Moreover, since the closing plate 60 is sandwiched between the flange 21 of the horizontal pipe 20 and the flange 33 of the downstream pipe 30, the structure is simple and the apparatus 1 can be miniaturized.

  In addition, the measurement target of the characteristic measuring apparatus 1 is not a liquid stored in a tank or the like, but a flowing liquid flowing through a pipe. Therefore, the instantaneous characteristics of the fluid can be measured, and it is easy to monitor changes in characteristics over time. In general, since the volume in the pipe is smaller than the volume of the tank, the liquid in the pipe is uniform with little variation in characteristics. Since a uniform fluid can be measured, accurate characteristics can be specified.

  Further, the characteristics of the leachate flowing from the flash tank F toward the cooling tank T can be constantly monitored by the characteristic measuring device 1. Since the characteristics of the leachate can be monitored at all times, it can be quickly dealt with when it deviates from the control standard value.

  For example, the deviation from the management reference value can be detected up to 4 hours earlier than when the redox potential of the leachate is measured every 4 hours by hand. If the state in which the oxidation-reduction potential of the leachate deviates from the control reference value is left for a long time, the reactivity in the autoclave is further lowered, and thus it takes a long time to recover to a normal state. In this regard, if it can be detected early, the time required for recovery can be shortened. Moreover, the addition amount of the oxidizing agent to the cooling tank T can be reduced, and the operating cost can be reduced.

  In addition, it is safe because the characteristics of the high-temperature fluid discharged from the flash tank F can be measured without human intervention.

  A nickel sulfate crystal production plant was operated. The raw material slurry was supplied to the autoclave at 80 L / min, and the leachate discharged from the autoclave was depressurized with a flash tank and cooled with a cooling tank.

Example 1
The characteristic measuring apparatus 1 shown in FIG. 1 was installed in the flow path between the flash tank and the cooling tank, and the oxidation-reduction potential of the leachate was measured.
When the redox potential of the leachate (Ag / AgCl electrode standard, the same applies hereinafter) is reduced to less than 450 mV, when the supply amount of the raw slurry to the autoclave is reduced to 50 L / min, the redox potential is restored to 450 mV or higher. It took 2 hours to do. Meanwhile, 35% by weight of hydrogen peroxide water was added to the cooling tank at a flow rate of 34 L / min.

(Comparative Example 1)
By measuring the leachate from the pipe between the flash tank and the cooling tank, the redox potential of the leachate was measured every 4 hours.
When the oxidation-reduction potential of the leachate decreased to less than 450 mV, when the supply amount of the raw slurry to the autoclave was reduced to 50 L / min, it took 4 hours for the oxidation-reduction potential to recover to 450 mV or more. Meanwhile, 35% by weight of hydrogen peroxide water was added to the cooling tank at a flow rate of 34 L / min.

  In Example 1, compared with Comparative Example 1, the time during which the flow rate of the raw material slurry was reduced could be shortened by 2 hours. Therefore, a reduction in processing efficiency could be suppressed. In addition, compared with Comparative Example 1, Example 1 was able to reduce the amount of hydrogen peroxide water added by 2 hours.

DESCRIPTION OF SYMBOLS 1 Characteristic measuring apparatus 10 Upstream pipe 20 Horizontal pipe 22 Reservoir part 30 Downstream pipe 40 Outlet pipe 41 Valve 50 Measuring instrument 53 Detection part 60 Blocking plate

Claims (7)

A part of the flow path through which the fluid flows, and a horizontal pipe arranged horizontally;
A closing plate that is provided on the downstream side of the horizontal pipe, closes a lower part of the horizontal pipe, and forms a liquid storage part in which the fluid liquid is stored inside the horizontal pipe;
An apparatus for measuring liquid fluid characteristics, comprising: a measuring device that is provided so that a detector is disposed in the liquid reservoir, and measures the characteristics of the liquid fluid. A downstream pipe connected to the downstream side of the horizontal pipe,
2. The fluid liquid characteristic measuring device according to claim 1, wherein the closing plate is sandwiched between a flange of the horizontal pipe and a flange of the downstream pipe. An upstream pipe connected to the upstream side of the horizontal pipe,
3. The fluid liquid characteristic measuring apparatus according to claim 1, wherein the upstream pipe is bent so that the upstream end is located above the downstream end. A discharge pipe connected to the lower surface of the horizontal pipe and discharging solid matter from the liquid reservoir;
4. The fluid liquid characteristic measuring device according to claim 1, further comprising a valve for opening and closing the discharge pipe. A downstream pipe connected to the downstream side of the horizontal pipe;
A discharge pipe for connecting the lower surface of the horizontal pipe and the downstream pipe, and discharging solid matter from the liquid reservoir;
The fluid-liquid characteristic measuring device according to claim 1, further comprising: a valve that opens and closes the discharge pipe. 6. The fluid liquid characteristic measuring apparatus according to claim 1, wherein the flow path is a flow path for flowing the liquid discharged from a flash tank that depressurizes the liquid discharged from the autoclave. . A method for measuring characteristics of a fluid, comprising measuring the characteristics of the fluid using the characteristic measuring device according to claim 1, 2, 3, 4, 5 or 6.

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