JP2019135316A - Gutter-connecting structure and anti-corrosion tank - Google Patents

Abstract

To provide a gutter-connecting structure in which a liquid is hard to leak out.SOLUTION: A liquid-discharging part 13 has a first bottom part 30 consisting of: a first upper layer 31, on an upper surface of which a liquid flows; and a first lower layer 32. A gutter 113 has a second bottom part 40 consisting of: a second upper layer 41, on an upper surface of which the liquid flows; and a second lower layer 42. The liquid-discharging part 13 and the gutter 113 are connected with each other by: bringing an end face 31f of the first upper layer 31 into contact with an end face 41f of the second upper layer 41; and bringing an end face 32f of the first lower layer 32 into contact with an end face 42f of the second lower layer 42. The end face 31f of the first upper layer 31 is protruded closer to the side of the gutter 113 than the end face 32f of the first lower layer 32, and the end face 42f of the second lower layer 42 is protruded closer to the side of the liquid-discharging part 13 than the end face 41f of the second upper layer 41.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a basket connection structure and a corrosion-resistant tank. More specifically, the present invention relates to a connection structure between a liquid discharge part of a tank and a basket, and a corrosion-resistant tank in which the connection structure is adopted.

  In electrolytic refining of copper, a plurality of anodes and cathodes are alternately inserted into an electrolytic cell using crude copper containing impurities as an anode and a thin plate of pure copper, stainless steel, or titanium as a cathode. While supplying an electrolytic solution to the electrolytic cell, current is passed between the anode and the cathode, and copper is electrodeposited on the cathode to obtain electrolytic copper.

  Copper contained in the anode is eluted into the electrolyte as copper ions. At the same time, impurities such as arsenic, bismuth, antimony and nickel contained in the anode are also eluted into the electrolyte. At the cathode, only copper ions in the electrolyte are electrodeposited on the cathode. Therefore, high purity electrolytic copper can be obtained.

  Since the impurities eluted from the anode remain in the electrolytic solution, the impurity concentration of the electrolytic solution increases as electrolytic purification proceeds. If the concentration of impurities in the electrolyte increases, the impurities co-deposit with copper, reducing the copper quality of the electrolytic copper, causing scale in the electrolyte piping, hindering operation, and reducing the electrical conductivity of the electrolyte. Such as increasing the power cost. Therefore, the electrolytic solution is sent to the liquid purification process to remove impurities.

  The liquid purification process in the electrolytic purification of copper is performed as follows. The electrolyte discharged from the electrolytic cell is concentrated by evaporation in vacuo, and the supersaturated copper is precipitated and removed as crude copper sulfate by rapid cooling. Next, copper removal electrolysis is performed to remove residual copper, arsenic, bismuth, and antimony by depositing on the cathode. The obtained copper removal electrolytic solution is heated in an electric evaporation tank to evaporate the water and concentrated, and then cooled to precipitate crude nickel sulfate, which is separated and removed by filtration. The obtained post-nickel removal solution is supplied again to the electrolytic cell (for example, Patent Document 1).

  In the nickel removal step, the graphite electrode rod is immersed in the copper removal electrolyte supplied to the electric evaporation tank and energized, and the copper removal electrolyte is heated by Joule heat to evaporate the moisture. During the concentration process, the copper removal electrolyte becomes a high-temperature, high-concentration nickel sulfate aqueous solution, which is highly corrosive. The nickel sulfate aqueous solution is discharged from the liquid discharge portion of the electric evaporation tank, and is led to the cooling crystal tank through the soot. Here, since the nickel sulfate aqueous solution is highly corrosive, it is necessary to prevent the nickel sulfate aqueous solution from leaking from the connecting portion between the liquid discharge portion and the extension rod.

JP 2014-101546 A

  In view of the above circumstances, an object of the present invention is to provide a basket connection structure in which liquid does not easily leak, and a corrosion-resistant tank in which the basket connection structure is employed.

The spear connection structure of the first invention is a connection structure between a liquid discharge portion of a tank and a spear, wherein the liquid discharge portion includes a first upper layer through which liquid flows on an upper surface, a first lower layer below the first upper layer, A first bottom portion comprising: a second bottom layer composed of a second upper layer through which liquid flows on an upper surface; and a second lower layer below the second upper layer; Is connected in a state where the end surface of the first upper layer and the end surface of the second upper layer are in contact with each other, and the end surface of the first lower layer and the end surface of the second lower layer are in contact with each other. The end surface protrudes to the heel side from the end surface of the first lower layer, and the end surface of the second lower layer protrudes to the liquid discharger side from the end surface of the second upper layer. .
The scissor connection structure according to a second aspect of the present invention is the first aspect, wherein the first bottom portion and the second bottom portion have an inclination that descends from the liquid discharge portion toward the scissors, and the end surface of the first upper layer The upper edge is arranged at a position lower than the upper edge of the end face of the first lower layer.
The spear connection structure of the third invention is a connection structure of a liquid discharge part of a tank and a spear, wherein the liquid discharge part includes a first upper layer through which liquid flows on an upper surface, a first lower layer below the first upper layer, A first bottom portion comprising: a second bottom layer composed of a second upper layer through which liquid flows on an upper surface; and a second lower layer below the second upper layer; Is connected in a state where the end surface of the first upper layer and the end surface of the second upper layer are in contact with each other, and the end surface of the first lower layer and the end surface of the second lower layer are in contact with each other. The end surface protrudes to the heel side from the end surface of the first upper layer, and the end surface of the second upper layer protrudes to the liquid discharger side from the end surface of the second lower layer. .
The corrosion-resistant tank according to a fourth aspect of the present invention includes a liquid discharge portion connected to a basket having a second bottom portion composed of a second upper layer through which liquid flows on the upper surface and a second lower layer below the second upper layer, and the liquid discharge portion Has a first bottom part composed of a first upper layer through which liquid flows and a first lower layer below the first upper layer, and the liquid discharge part has end faces of the first upper layer and end faces of the second upper layer. And the end surface of the first lower layer and the end surface of the second lower layer are in contact with each other, and the end surface of the first upper layer is the first surface. It protrudes in the said heel side rather than the said end surface of a lower layer, It is characterized by the above-mentioned.
According to a fifth aspect of the corrosion-resistant tank, in the fourth aspect, the first bottom portion has an inclination that descends from the liquid discharge portion toward the ridge, and the upper edge of the end surface of the first upper layer is It is arrange | positioned in the position lower than the upper edge of the said end surface of a 1st lower layer.
A corrosion-resistant tank according to a sixth aspect of the present invention includes a liquid discharge portion connected to a basket having a second bottom portion composed of a second upper layer through which liquid flows on an upper surface and a second lower layer below the second upper layer, and the liquid discharge portion Has a first bottom part composed of a first upper layer through which liquid flows and a first lower layer below the first upper layer, and the liquid discharge part has end faces of the first upper layer and end faces of the second upper layer. And the end surface of the first lower layer and the end surface of the second lower layer are in contact with each other, and the end surface of the first lower layer is connected to the first layer. It protrudes in the said heel side rather than the said end surface of an upper layer, It is characterized by the above-mentioned.

  According to the present invention, since the connection surface between the upper layers and the connection surface between the lower layers of the liquid discharge part and the ridge are separated from each other, even if the liquid enters the gap generated in the connection surface between the upper layers, It is difficult to reach the connection surface between lower layers. As a result, it is difficult for the liquid to leak from the connecting portion between the liquid discharge portion and the ridge.

It is a longitudinal cross-sectional view of the corrosion-resistant tank which concerns on one Embodiment of this invention. It is explanatory drawing of the laminated structure of the bottom part of the corrosion-resistant tank of FIG. 1, a side wall, and a liquid discharge part. It is the III section enlarged view in FIG. It is the IV section enlarged view in FIG. It is an enlarged view of the connection part of a liquid discharge part and a ridge. It is an enlarged view of the connection part of a liquid discharge part in another embodiment. It is an enlarged view of the connection part of a liquid discharge part and a ridge in other embodiment. 4 is a longitudinal sectional view of a corrosion resistant tank of Comparative Example 1. FIG. It is explanatory drawing of a nickel removal installation.

Next, an embodiment of the present invention will be described with reference to the drawings.
In the electrolytic purification of copper, a liquid purification process for removing impurities from the electrolytic solution is performed. The liquid purification process includes a nickel removal process. The corrosion-resistant tank which concerns on one Embodiment of this invention is used for the nickel removal installation which performs a nickel removal process.

(Nickel removal equipment)
The nickel removal step is performed with the equipment shown in FIG. The nickel removal equipment has an electric evaporation tank 110. A copper removal electrolyte is supplied to the electric evaporation tank 110. The copper removal electrolytic solution is a solution obtained by removing copper from the electrolytic solution, and is a crude nickel sulfate aqueous solution. The copper removal electrolytic solution is preheated to 50 to 90 ° C. and then supplied to the electric evaporation tank 110.

  The electric evaporation tank 110 is a cylindrical tank whose upper part is covered with a lid 111. The lid 111 is provided with a supply port for supplying a copper removal electrolyte into the electric evaporation tank 110. The lid 111 is formed with insertion holes at a plurality of positions with a predetermined interval, and a graphite electrode rod 112 is inserted into each of the holes. Each graphite electrode rod 112 is immersed in a copper removal electrolytic solution in the electric evaporation tank 110. An electric wire (not shown) is connected to the graphite electrode rod 112. By passing a current between the graphite electrode rods 112 through the electric wires, the copper removal electrolyte in the electric evaporation tank 110 is energized. Thus, the copper removal electrolyte is heated by Joule heat to evaporate and concentrate the water. The heating temperature of the copper removal electrolytic solution in the electric evaporation tank 110 may be a temperature equal to or higher than the boiling point of the copper removal electrolytic solution, but is usually 150 to 200 ° C.

  A trough 113 is connected to the side wall of the electric evaporation tank 110. In the concentrated copper removal electrolyte, crude nickel sulfate crystals are deposited to form a slurry. This slurry is guided to the cooling crystal tank 120 through the basket 113.

  The slurry discharged from the electric evaporation tank 110 is cooled in the cooling crystal tank 120. As a result, the solubility is remarkably lowered, and crude nickel sulfate crystals are further precipitated in the slurry. The slurry is discharged from the cooling crystal tank 120 and separated into solid and liquid by the filter 130 to recover the crude nickel sulfate crystals.

  The recovered crude nickel sulfate crystals are stored in a container 140. On the other hand, the filtrate is stored in the receiver tank 150. The filtrate stored in the receiver tank 150 is discharged out of the system or reused as sulfuric acid to replenish the electrolyte.

(Corrosion-resistant tank)
In the electric evaporation tank 110, a high-temperature and high-concentration crude nickel sulfate aqueous solution is produced. Therefore, the electric evaporation tank 110 needs to have corrosion resistance against high temperature and high concentration sulfuric acid. A corrosion-resistant tank 1 according to an embodiment of the present invention is used for the electric evaporation tank 110.

  As shown in FIG. 1, the electric evaporation tank 110 includes a corrosion-resistant tank 1 as a tank body and a lid 111 that covers an upper opening of the corrosion-resistant tank 1. The corrosion-resistant tank 1 is a substantially cylindrical tank composed of a bottom 11 and a side wall 12 standing on the periphery of the bottom 11.

  A part of the side wall 12 is provided with a liquid discharge portion 13 that protrudes outward from its outer surface. The liquid discharge part 13 is formed with a flow path 14 through which the content liquid (crude nickel sulfate aqueous solution) of the corrosion-resistant tank 1 flows. The flow path 14 reaches the inner surface of the side wall 12 and communicates the inside and the outside of the corrosion-resistant tank 1. The concentrated crude nickel sulfate aqueous solution is discharged out of the corrosion-resistant tank 1 through the flow path 14 together with the crystals. A flange 113 is connected to the tip of the liquid discharger 13.

  The flow path 14 of the liquid discharge part 13 has an inclination that decreases toward the outside of the corrosion-resistant tank 1. Further, the ridge 113 also has an inclination that decreases toward the outside of the corrosion-resistant tank 1. Therefore, the content liquid naturally flows down according to the inclination of the flow path 14 and the ridge 113.

  The liquid discharge portion 13 may have a cylindrical shape in which a hole-like flow path 14 is formed, or may have a bowl shape in which an upper portion of the groove-shaped flow path 14 is opened. In any shape, the liquid discharge part 13 has a bottom part 30 that comes into contact with the content liquid.

  The trough 113 is connected to the corrosion-resistant tank 1 at a position away from the outer surface of the side wall 12. Therefore, even if the liquid discharge part 13 and the flange 113 do not sufficiently adhere to each other and a gap is generated in the connecting part, the crude nickel sulfate aqueous solution leaking from the connecting part does not travel along the outer surface of the side wall 12, There is no risk of corroding a wide area.

  The bottom part 11 and the side wall 12 are each comprised from the outer shell 21 which comprises the outermost layer, and the brick layer 24 which comprises the innermost layer. In addition, the bottom 30 of the liquid discharge unit 13 includes an outer shell 21 that forms the lowermost layer and a brick layer 24 that forms the uppermost layer. The outer shell 21 is formed of a metal such as stainless steel or a resin such as FRP (fiber reinforced plastic), and constitutes the outer shape of the corrosion-resistant tank 1.

  The brick layer 24 is formed by stacking acid-resistant bricks. The brick layer 24 may be formed by laminating a plurality of bricks or may be formed by one layer. In addition, joint material is applied and filled around each brick in order to fix the adhesive and prevent liquid from entering.

  As shown in FIG. 2, a fluororesin layer 22 and a heat insulating layer 23 are disposed between the outer shell 21 and the brick layer 24 that constitute the bottom portion 11, the side wall 12, and the liquid discharge portion 13. That is, the outer shell 21, the fluororesin layer 22, the heat insulation layer 23, and the brick layer 24 are laminated in this order.

  The fluororesin layer 22 is applied to the inner surface (upper surface) of the outer shell 21. The fluororesin layer 22 is made of a fluororesin such as PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), PTFE (tetrafluoroethylene), FEP (tetrafluoroethylene / hexafluoropropylene copolymer). Has been. Among fluororesins, it is preferable to use PFA and PTFE having high heat resistance.

  If the fluororesin layer 22 is too thin, the strength becomes weak. On the other hand, if it is too thick, the fluororesin layer 22 is easily peeled off from the outer shell 21 due to the difference in thermal expansion coefficient between the outer shell 21 and the fluororesin layer 22. Therefore, the thickness of the fluororesin layer 22 is preferably 1 to 10 mm.

  As a method of forming the fluororesin layer 22, there are sheet lining and coating lining. Sheet lining is a method of attaching a plurality of fluororesin sheets to the outer shell 21. Coat lining is a method of coating the outer shell 21 with a fluororesin by applying a fluororesin agent having a low degree of polymerization such as a monomer with a brush or the like to cause a polymerization reaction. Since the polymerization reaction requires a certain temperature, after applying the fluororesin agent, it is heated with a hair dryer or the like to cause the polymerization reaction. It is also possible to cause a polymerization reaction with heat accompanying use of the electric evaporation tank 110.

  In the case of sheet lining, a seam is generated between the fluororesin sheets. This seam is a chemically, mechanically and thermally weak part, and is the starting point for deformation, deterioration and breakage. Specifically, since the fluororesin sheet does not have enough activity to start the reaction, the joint of the fluororesin sheet becomes a chemically weak part without bonding. Further, only a flat sheet of fluororesin sheet is distributed, and it is necessary to make a curved surface or a bent side in accordance with the shape of the outer shell 21. When a curved surface or a bent side is formed on the fluororesin sheet, stress is applied to the seam of the fluororesin sheet, resulting in a mechanically weak portion. Furthermore, since it is difficult to line the fluororesin sheet and the adhesive with the same components and purity, and the difference in average molecular length and density occurs, the seam of the fluororesin sheet becomes a portion that is vulnerable to thermal expansion. Therefore, when adopting sheet lining, it is preferable to lining the fluororesin sheet with a plurality of layers.

  On the other hand, in the case of coating lining, since the application of the fluororesin agent to the entire outer shell 21 is completed before the polymerization is substantially completed, no seam is formed in the fluororesin layer 22. In addition, since deformation such as bending of the sheet is not required, the fluororesin is welded to the outer shell 21. Furthermore, even if the production lots of the fluororesin agent are different, the characteristics related to thermal expansion such as average molecular length and density can be kept uniform by stirring and mixing. Therefore, a portion where stress concentrates on the fluororesin layer 22 does not occur, and deformation, deterioration, and breakage of the fluororesin layer 22 can be suppressed. As a result, the corrosion resistance of the corrosion-resistant tank 1 can be further increased.

  The heat insulation layer 23 is formed of a material having heat insulation properties such as fibers such as glass cloth. The heat insulating layer 23 may be formed of an air layer. Fluoropolymers are vulnerable to relatively high temperatures. By disposing the heat insulating layer 23 between the fluororesin layer 22 and the brick layer 24, the heat of the content liquid transmitted from the brick layer 24 can be blocked by the heat insulating layer 23. Therefore, the fluororesin layer 22 can be maintained at a temperature close to the temperature of the outer shell 21 and the outside air, and deterioration of the fluororesin layer 22 can be suppressed. In addition, the brick layer 24 has heat insulation similarly to the heat insulation layer 23, and can maintain the heat insulation layer 23, the fluororesin layer 22, and the outer shell 21 at low temperature. The brick layer 24 can improve heat insulation, so that thickness is increased.

  Since the bottom part 11, the side wall 12 and the liquid discharge part 13 of the corrosion-resistant tank 1 have the laminated structure as described above, it is assumed that the content liquid in the corrosion-resistant tank 1 has permeated the brick layer 24 located inside the fluororesin layer 22. In addition, the content liquid can be prevented from reaching the outer shell 21 by the fluororesin layer 22. Moreover, since the content liquid of the corrosion-resistant tank 1 cools in the process of permeating the brick layer 24, the corrosivity becomes weak. Therefore, the outer shell 21 is hardly corroded, and the corrosion resistance of the corrosion-resistant tank 1 can be increased.

  As shown in FIG. 3, the outer shell 21 constituting the side wall 12 has a flange portion 21a at the upper edge. The lid 111 is connected to the flange portion 21a. The fluororesin layer 22 constituting the side wall 12 extends to the flange portion 21a and covers the seating surface of the flange portion 21a. Thus, by covering the seating surface of the flange portion 21a with the fluororesin layer 22, corrosion of the flange portion 21a can be suppressed.

  As shown in FIG. 4, the outer shell 21 constituting the liquid discharge portion 13 has a flange portion 21 b at the tip. A flange 113 is connected to the liquid discharge part 13 via a flange part 21b. The fluororesin layer 22 constituting the liquid discharge portion 13 extends to the flange portion 21b and covers the seating surface of the flange portion 21b. Thus, by covering the seating surface of the flange portion 21b with the fluororesin layer 22, corrosion of the flange portion 21b can be suppressed.

  The electric evaporation tank 110 may be intermittently supplied with a crude nickel sulfate aqueous solution. In this case, the discharge of the crude nickel sulfate aqueous solution from the flow path 14 is also intermittent. Since the period during which the heated crude nickel sulfate aqueous solution is discharged and the period during which it is not discharged are repeated, the liquid discharge unit 13 is repeatedly heated and allowed to cool. For this reason, the liquid discharge unit 13 is subjected to a load due to repeated thermal expansion and contraction, which causes the liquid discharge unit 13 to deteriorate.

As shown in FIG. 1, in the corrosion-resistant tank 1 of the present embodiment, the thickness T ₁ of the brick layer 24 constituting the bottom 30 of the liquid discharge unit 13 is approximately the same as the thickness T ₂ of the brick layer 24 of the side wall 12. It is secured. Specifically, the thickness T ₁ is 0.5 to 1.5 times the thickness T ₂ . Thus, since the brick layer 24 of the liquid discharge part 13 is comparatively thick, the liquid discharge part 13 can endure the load by thermal expansion and thermal contraction.

  As described above, the corrosion-resistant tank 1 has a high corrosion resistance, and the liquid discharger 13 can withstand a load caused by thermal expansion and contraction. Therefore, the corrosion resistant tank 1 has a long service life. Therefore, the opportunity loss by the operation stop accompanying the update of the corrosion-resistant tank 1 and the cost concerning the update of the corrosion-resistant tank 1 can be reduced.

  In addition, the use of the corrosion-resistant tank 1 is not limited to the electric evaporation tank 110, but is suitably used as a tank for treating a highly corrosive liquid such as high temperature and high concentration sulfuric acid.

(樋 connection structure)
Below, the connection structure of the liquid discharge part 13 of the corrosion-resistant tank 1 and the ridge 113 is demonstrated.
As shown in FIG. 5, the liquid discharge part 13 has a bottom part 30 through which the liquid flows on the upper surface and side parts 33 constituting the side walls. The bottom portion 30 has an inclination that descends from the liquid discharge portion 13 toward the ridge 113. Hereinafter, for convenience of explanation, the bottom 30 of the liquid discharger 13 is referred to as a “first bottom 30”.

  The first bottom portion 30 includes a first upper layer 31 and a first lower layer 32. The liquid flows on the upper surface of the first upper layer 31. A first lower layer 32 is disposed below the first upper layer 31. The first upper layer 31 and the first lower layer 32 may be physically separate layers, or may be a single member virtually separated. The ratio of the thickness of the first upper layer 31 and the first lower layer 32 is not particularly limited.

  For example, when the brick layer 24 is formed by laminating a plurality of bricks, the first upper layer 31 may be constituted by the upper brick, and the first lower layer 32 may be constituted by the lower brick. When the brick layer 24 is formed of one brick layer, the bricks may be virtually divided into upper and lower layers to form the first upper layer 31 and the first lower layer 32. In the present embodiment, the first upper layer 31 is constituted by the upper part of the brick layer 24, and the first lower layer 32 is constituted by the lower part of the brick layer 24 and the outer shell 21. On the other hand, the first upper layer 31 may be constituted by the entire brick layer 24, and the first lower layer 32 may be constituted by the outer shell 21.

  The end surface 31f on the liquid discharge side of the first upper layer 31 protrudes closer to the flange 113 than the end surface 32f on the liquid discharge side of the first lower layer 32. That is, the first upper layer 31 protrudes closer to the ridge 113 than the first lower layer 32. Hereinafter, the protruding portion of the first upper layer 31 is referred to as a protruding portion 31a.

  The flange portion 21 b of the liquid discharge portion 13 is provided outside the first lower layer 32. The seating surface of the flange portion 21 b is along the end surface 32 f of the first lower layer 32.

  As with the liquid discharge portion 13, the ridge 113 is composed of an outer shell 21 that constitutes the lowermost layer and a brick layer 24 that constitutes the uppermost layer. Between the outer shell 21 and the brick layer 24, the fluororesin layer 22 and the heat insulating layer 23 may be disposed, or may not be disposed.

  The eaves 113 have a bottom 40 through which liquid flows on the upper surface and side portions 43 constituting side walls. The bottom portion 40 has an inclination that descends from the liquid discharge portion 13 toward the ridge 113. Hereinafter, for convenience of explanation, the bottom 40 of the ridge 113 is referred to as a “second bottom 40”.

  The second bottom portion 40 includes a second upper layer 41 and a second lower layer 42. The liquid flows on the upper surface of the second upper layer 41. A second lower layer 42 is disposed below the second upper layer 41. The second upper layer 41 and the second lower layer 42 may be physically separate layers, or may be a single member virtually separated. The thickness of the second upper layer 41 is substantially the same as the thickness of the first upper layer 31, and the thickness of the second lower layer 42 is substantially the same as the thickness of the first lower layer 32.

  An end surface 42f on the liquid inflow side of the second lower layer 42 protrudes closer to the liquid discharger 13 than an end surface 41f on the liquid inflow side of the second upper layer 41. That is, the second lower layer 42 protrudes closer to the liquid discharger 13 than the second upper layer 41. Thereby, the hollow 41a in which the protrusion part 31a fits is formed in the upper part of the 2nd bottom part 40. As shown in FIG. The protruding width of the second lower layer 42 is substantially the same as the protruding width of the first upper layer 31.

  The flange portion 21 c of the flange 113 is provided outside the second lower layer 42. The seating surface of the flange portion 21 c is along the end surface 42 f of the second lower layer 42.

  The liquid discharge part 13 and the flange 113 are connected by fitting the protrusion 31 a of the liquid discharge part 13 into the recess 41 a of the flange 113. When the liquid discharge portion 13 and the ridge 113 are connected, the end surface 31f of the first upper layer 31 and the end surface 41f of the second upper layer 41 are in surface contact, and the end surface 32f of the first lower layer 32 and the second lower layer 42 are in contact with each other. The end surface 42f comes into surface contact. Further, the lower surface of the protruding portion 31a and the upper surface of the recess 41a are in surface contact. The upper surface of the first bottom portion 30 and the upper surface of the second bottom portion 40 are substantially flush with each other.

  The flange portion 21b of the liquid discharge portion 13 and the flange portion 21c of the flange 113 are fastened by a bolt, a vise, or the like. Thereby, the clearance gap between the liquid discharge part 13 and the collar 113 can be minimized. However, a slight gap may occur at the connection portion between the liquid discharge portion 13 and the ridge 113. Moreover, when the liquid which has corrosiveness penetrate | invades into the slight clearance gap, the structural member of the liquid discharge part 13 and the ridge 113 may be corroded, and a clearance gap may spread.

  The liquid flowing through the liquid discharge unit 13 and the ridge 113 enters through a gap generated on the connection surface (the connection surface between the end surface 31f and the end surface 41f) between the upper layers 31 and 41 of the liquid discharge unit 13 and the ridge 113. Here, in the present embodiment, the connection surface between the upper layers 31 and 41 and the connection surface between the lower layers 32 and 42 (connection surface between the end surface 32f and the end surface 42f) are not flush with each other and are separated from each other. It is arranged at the position. Therefore, even if the liquid enters the gap generated on the connection surface between the upper layers 31 and 41, the liquid hardly reaches the connection surface between the lower layers 32 and 42. As a result, it is difficult for the liquid to leak from the connecting portion between the liquid discharge portion 13 and the flange 113.

  In the present embodiment, the upper surface of the recess 41 a has an inclination that rises from the connection surface between the upper layers 31 and 41 toward the connection surface between the lower layers 32 and 42. Therefore, even if the liquid enters from the connection surface between the upper layers 31 and 41, the liquid is blocked by the inclination of the upper surface of the recess 41 a and hardly reaches the connection surface between the lower layers 32 and 42.

  In addition, as shown in FIG. 6, you may make the protrusion width | variety of the 1st upper layer 31 long. Then, the upper edge A of the end surface 31 f of the first upper layer 31 is disposed at a position lower than the upper edge B of the end surface 32 f of the first lower layer 32. That is, the upper edge B of the connection surface between the lower layers 32 and 42 is arranged at a higher position than the upper edge A of the connection surface between the upper layers 31 and 41 of the liquid discharger 13 and the ridge 113. The liquid that has entered the connection surface between the upper layers 31 and 41 due to the difference in height between the upper edges A and B hardly reaches the connection surface between the lower layers 32 and 42. This is because the liquid that has entered from the upper edge A does not flow to a higher position unless an external force is applied.

  Further, as shown in FIG. 7, the first lower layer 32 may be protruded toward the ridge 113, and the second upper layer 41 may be protruded toward the liquid discharge unit 13. In the embodiment shown in FIG. 7, the end surface 32 f of the first lower layer 32 protrudes closer to the flange 113 than the end surface 31 f of the first upper layer 31. Further, the end surface 41 f of the second upper layer 41 protrudes toward the liquid discharger 13 than the end surface 42 f of the second lower layer 42. The second upper layer 41 constitutes the protruding portion 41b. A recess 31 b into which the protruding portion 41 b is fitted is formed on the upper portion of the first bottom portion 30.

  Even in such a configuration, the connection surface between the upper layers 31 and 41 and the connection surface between the lower layers 32 and 42 are separated from each other. Therefore, even if the liquid enters the gap generated on the connection surface between the upper layers 31 and 41, the liquid hardly reaches the connection surface between the lower layers 32 and 42. As a result, it is difficult for the liquid to leak from the connecting portion between the liquid discharge portion 13 and the flange 113.

  In particular, in the electric evaporation tank 110, the slurry heated to the atmospheric temperature or higher is discharged from the liquid discharge unit 13. When this high-temperature slurry enters a gap formed on the connection surface between the upper layers 31 and 41, the liquid phase is evaporated before the slurry reaches the connection surface between the lower layers 32 and 42, and a solid content is generated. This solid content adheres to the gap between the liquid discharger 13 and the ridge 113, and can fill the gap.

  In addition, the saddle connection structure is not limited to the corrosion-resistant tank 1 and can be applied to various tanks.

Next, examples will be described.
The operation using the nickel removal equipment shown in FIG. 9 was performed. The copper removal electrolytic solution supplied to the electric evaporation tank 110 has a nickel concentration of 30 to 35 g / L, a copper concentration of 0.05 g / L or less, and an arsenic concentration of 1.0 g / L or less. The copper removal electrolyte was preheated to 90 ° C. and then supplied to the electric evaporation tank 110. The set value of the heating temperature of the electric evaporation tank 110 is 160 ° C.

Example 1
The corrosion resistant tank 1 shown in FIG. As shown in FIG. 2, the bottom part 11, the side wall 12, and the liquid discharge part 13 are each configured by laminating an outer shell 21, a fluororesin layer 22, a heat insulating layer 23, and a brick layer 24 in this order. The fluororesin layer 22 was formed by coating lining. Moreover, the connection structure of the liquid discharge part 13 and the ridge 113 is as shown in FIG.

  As a result, the service life of the electric evaporation tank 110 was 5 years or more. Moreover, in the operation for 5 years, the leakage of the liquid was not confirmed from the connection part of the liquid discharge part 13 and the basket 113.

(Comparative Example 1)
The corrosion resistant tank 2 shown in FIG. The configuration of the corrosion-resistant tank 2 is basically the same as the configuration of the corrosion-resistant tank 1 shown in FIG. 1, but the thickness T ₁ of the brick layer 24 that forms the bottom of the liquid discharge unit 13 is the brick layer 24 of the side wall 12. of 0.2 times the thickness T _2. The fluororesin layer 22 was formed by sheet lining. As a result, the service life of the electric evaporation tank 110 was about 2.5 years.

DESCRIPTION OF SYMBOLS 1 Corrosion-resistant tank 11 Bottom part 12 Side wall 13 Liquid discharge part 30 1st bottom part 31 1st upper layer 32 1st lower layer 40 2nd bottom part 41 2nd upper layer 42 2nd lower layer 113 樋

Claims (6)

It is a connection structure between the liquid discharge part of the tank and the tank,
The liquid discharge part has a first bottom part composed of a first upper layer through which liquid flows on the upper surface and a first lower layer below the first upper layer,
The scissors have a second bottom part composed of a second upper layer through which liquid flows on the upper surface and a second lower layer below the second upper layer,
The liquid discharge part and the ridge are connected in a state in which the end surface of the first upper layer and the end surface of the second upper layer are in contact with each other, and the end surface of the first lower layer and the end surface of the second lower layer are in contact with each other And
The end surface of the first upper layer protrudes toward the heel side from the end surface of the first lower layer,
The scissor connection structure, wherein the end surface of the second lower layer protrudes closer to the liquid discharger than the end surface of the second upper layer. The first bottom part and the second bottom part have an inclination that descends from the liquid discharge part toward the bowl,
The hook connection structure according to claim 1, wherein an upper edge of the end surface of the first upper layer is disposed at a position lower than an upper edge of the end surface of the first lower layer. It is a connection structure between the liquid discharge part of the tank and the tank,
The liquid discharge part has a first bottom part composed of a first upper layer through which liquid flows on the upper surface and a first lower layer below the first upper layer,
The scissors have a second bottom part composed of a second upper layer through which liquid flows on the upper surface and a second lower layer below the second upper layer,
The liquid discharge part and the ridge are connected in a state in which the end surface of the first upper layer and the end surface of the second upper layer are in contact with each other, and the end surface of the first lower layer and the end surface of the second lower layer are in contact with each other And
The end surface of the first lower layer protrudes toward the heel side from the end surface of the first upper layer,
The end surface of the second upper layer projects from the end surface of the second lower layer to the liquid discharger side. A liquid discharge part connected to a ridge having a second bottom part composed of a second upper layer through which liquid flows on the upper surface and a second lower layer below the second upper layer;
The liquid discharge part has a first bottom part composed of a first upper layer through which liquid flows on the upper surface and a first lower layer below the first upper layer,
The liquid discharge portion is connected to the flange in a state where an end surface of the first upper layer and an end surface of the second upper layer are in contact with each other, and an end surface of the first lower layer and an end surface of the second lower layer are in contact with each other. Configured to be
The said end surface of the said 1st upper layer protrudes in the said heel side rather than the said end surface of the said 1st lower layer, The corrosion-resistant tank characterized by the above-mentioned. The first bottom portion has an inclination that descends from the liquid discharge portion toward the ridge,
The corrosion-resistant tank according to claim 4, wherein an upper edge of the end surface of the first upper layer is disposed at a position lower than an upper edge of the end surface of the first lower layer. A liquid discharge part connected to a ridge having a second bottom part composed of a second upper layer through which liquid flows on the upper surface and a second lower layer below the second upper layer;
The liquid discharge part has a first bottom part composed of a first upper layer through which liquid flows on the upper surface and a first lower layer below the first upper layer,
The liquid discharge portion is connected to the flange in a state where an end surface of the first upper layer and an end surface of the second upper layer are in contact with each other, and an end surface of the first lower layer and an end surface of the second lower layer are in contact with each other. Configured to be
The said end surface of the said 1st lower layer protrudes in the said ridge side rather than the said end surface of the said 1st upper layer, The corrosion-resistant tank characterized by the above-mentioned.

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