JP3492272B2 - Fixing structure of heat exchange tube of heat exchanger - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a heat exchange tube of a heat exchanger, and more specifically, to a heat exchanger for fixing a heat exchange tube arranged in a tank in which a liquid is stored. The present invention relates to a heat exchange tube fixing structure.

[0002]

2. Description of the Related Art First, a general flow of main nonferrous metal smelting will be described. First of all, the ore as it is mined from the mine is called “coarse ore” and contains a large amount of non-valued substances (gangues) in addition to useful minerals. The stone is removed as a tailing and the high-grade concentrate is used for smelting. Beneficiation is carried out by utilizing the physical or physicochemical properties of minerals such as density, hardness, magnetism, conductivity, wettability, and the like.

The concentrate obtained is blown into a flash furnace at the same time as oxygen-enriched air or high-temperature hot air to cause a chemical reaction instantaneously and separate into a mat and a slag. The flash smelting furnace utilizes the heat of the oxidation reaction of the concentrate, and is characterized by a lower fuel consumption rate than other methods. The mat obtained here has 60 copper
~ 70% included. Further, since slag contains about 1% of copper, it is smelted in a smelting furnace, copper is recovered as a mat, and the copper is treated in a converter together with the mat from the smelting furnace.

[0004] The operation in the converter is divided into a slag-forming period (manufacturing period) and a copper-making period in batches, and iron in the mat is removed as slag during the slag-producing period. This slag generation period is 2
Repeated ~ 3 times, the produced white paste reaches a certain amount and then enters the copper making stage to obtain blister copper. Then, the obtained crude copper is subjected to adjustment of S and O in the crude copper in a refining furnace, then an anode is cast, and electrolytic refining is performed to obtain high-quality electrolytic copper. on the other hand,
On the bottom of the electrolytic cell, anode slime in which insoluble impurities contained in the anode are deposited in a mud form is deposited. Since this anode slime contains useful noble metals such as gold and silver in addition to copper, the precipitate after decopperization leaching with sulfuric acid or the like is chlorinated with hydrochloric acid to recover gold and silver. An analysis example of the composition of the concentrate used for chloride leaching is Au: 2.3.
0%, Se: 13.20%, Te: 3.50%, Pd:
0.03%, Ag: 26.00%, Pb: 6.40%,
Others: 48.57%.

"Chloride leaching" is about 35% of the above-mentioned impurities.
It dissolves at a temperature of 65 to 75 degrees Celsius with a concentrated hydrochloric acid solution, and the metal eluted from the hydrochloric acid is chemically or electrically reduced to collect the metal ion or the metal is collected, or a pure compound of the target metal is obtained. Is a method of crystallization precipitation.
As an example of analysis, the concentration of the substance at the start of leaching is shown as 8
It is 30 g / l (solid dry amount / solution volume), and becomes 306 g / l (solid dry amount / solution volume) after leaching.

[0006]

In such a chloride leaching step, when the metal is dissolved or suspended, the metal contained in the precipitate reacts with the hydrochloric acid solution to cause an exothermic reaction, and the temperature of the solution is increased. It may change rapidly. Therefore, a temperature of the solution is adjusted by placing a heat exchange tube inside the tank and cooling the solution by passing a heat exchange medium through the heat exchange tube. Since the solution is stirred in order to promote vibration and reaction of the heat exchange tube caused by flowing the heat exchange medium, the heat exchange tube needs to be firmly fixed in the tank.

As shown in FIGS. 4 and 5, the conventional fixing structure of the heat exchange tube in the chloride leaching is provided with a plurality of plate-like fixing plates 21 on the inner wall of the tank for storing the solution,
Four plate-shaped supports 23, 2 on the side surface of the fixed plate 21
Support 5, 27, 29. Notch 3 that substantially matches the shape of the outer peripheral surface of the heat exchange tube on a predetermined portion of the side surface
Supports 23, 25, 27, 29 with 0, 30 formed
The heat exchange tubes are clamped and fixed by the hole portions 33, 33 formed by combining the notches 30, 30 formed in the supports 23, 25, 27, 29 so that they face each other. It was a thing.

However, with this fixing structure alone, heat is generated due to the vibration generated when the heat exchange medium flows through the heat exchange tube due to the slight gap existing between the heat exchange tube and the fixing member and the vibration due to the stirring of the solution. The replacement tube and the fixing member may slide and be damaged. Also,
When the heat exchange medium flows through the heat exchange tube, the heat exchange tube undergoes a thermal change and expands and contracts, thereby creating a gap between the heat exchange tube and the fixing member, which may cause the above problem. is there. Further, the existing insoluble matter in the solution may become hard and small particles and may pass through the gap between the heat exchange tube and the fixing member due to the liquid flow generated by stirring. Since the width of the gap is so narrow that the insoluble matter passes through the gap at a high speed, the surface of the heat exchange tube and the fixing member may be scraped by the insoluble matter. On the other hand, the insoluble matter may not pass through the gap and may be clogged. In that case, the insoluble matter and the heat exchange tube or the fixing member may be slid and damaged due to vibration caused by flowing the heat exchange medium or vibration caused by stirring the solution.

When the heat exchange tube is damaged, the heat exchange medium flows into the solution and contaminates the solution. Further, if the solution in the tank mixes into the heat exchange tube, the heat exchange equipment will break down. Furthermore, if the fixing member is damaged, it becomes difficult to hold the heat exchange tube, and the leaching operation must be interrupted. Therefore, an object of the present invention is to provide a fixing structure for a heat exchange tube of a heat exchanger, which can be firmly fixed without forming a gap between the heat exchange tube and a fixing member for fixing the heat exchange tube. And

[0010]

In order to solve the above-mentioned problems, the invention according to claim 1 is arranged in a tank in which a liquid is stored, and heat flowing a heat exchange medium for heating or cooling the liquid. A heat exchange tube, which is made of synthetic resin having heat resistance and chemical resistance, and whose outer peripheral surface is covered with a cushioning material having elasticity at predetermined intervals on its side surface. For heat exchange with holes formed by combining a plurality of plate-shaped supports with cutouts that almost match the shape of the outer peripheral surface of the heat exchange tube so that the cutouts face each other (EN) Provided is a fixing structure of a heat exchange tube of a heat exchanger, which tightly clamps and fixes a cushion material portion of the tube.

In order to solve the above-mentioned problems, a second aspect of the present invention provides a heat exchange tube fixing structure for a heat exchanger according to the first aspect, in which a cushion material is provided around the cushion material.
Further, a protective member is coated so as to cover the cushion material.

In order to solve the above-mentioned problems, the invention according to claim 3 is the fixing structure of the heat exchange tube of the heat exchanger according to claim 1 or 2, wherein the cushion material and / or
Alternatively, the protective member is formed of a synthetic resin having heat resistance and chemical resistance.

In order to solve the above-mentioned problems, the invention according to claim 4 is the fixing structure of the heat exchange tube of the heat exchanger according to any one of claims 1 to 3, wherein the liquid is a metal. It is characterized in that it is a solution and / or suspension containing a valuable metal in the leaching step of smelting.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a fixing structure of a heat exchange tube of a heat exchanger according to the present invention will be described in more detail based on a preferred embodiment shown in the drawings. First,
As shown in FIGS. 1 (a) and 2, the heat exchanger 1 is formed in a spiral shape having different diameters in a cylindrical tank 10 in which a solution for heating or cooling by heat exchange is stored. Three heat exchange tubes 11a, 11b, 11
c is arranged and configured.

Heat exchange tubes 11a, 11b, 11c
Pipes 13a, 13b, 1 connected to the lower end of the
3c is a flexible tube 15a, 15b, 15c for supplying a heat exchange medium sent from a pump (not shown) into the heat exchange tubes 11a, 11b, 11c.
Are connected. On the other hand, the heat exchange tubes 11a, 11
connection pipes 17a, 17 connected to the upper side of b, 11c
Flexible tubes 19a, 19b and 19c for discharging the heat exchange medium are connected to b and 17c so that the heat exchange medium flowing in the heat exchange tubes 11a, 11b and 11c is discharged. The heat exchange medium sent from a pump (not shown) is supplied to the flexible tubes 15a, 15b, 15c by the branch pipe 12, and the flexible tubes 19a, 19b, 19 are also supplied.
The heat exchange medium discharged from c is collected by the branch pipe 18 at one place and then discharged. In the present embodiment, “water” is used as the heat exchange medium, but it is not limited to this.

Plate-like fixing plates 21 having a length from the bottom to the top are provided at six locations on the inner wall 10c of the tank 10 at equal intervals and project toward the center, and four plate-like plates are formed. The supports 23, 25, 27, 29 are supported by the fixed plates 21, 21 (see FIG. 5). Supports 23, 2
Cutouts 30, 30 are formed on predetermined side surfaces of 5, 27, 29 so as to substantially match the shape of the outer peripheral surfaces of the heat exchange tubes 11a, 11b, 11c formed in a spiral shape. The cutouts 30, 30 are heat exchange tubes 11a, 11
It is provided by the number corresponding to the number of turns of b and 11c. Of course, the number and position of the fixing plates 21 are not limited to this, and the shape and number of the heat exchange tubes are not limited to those of this embodiment.
The fixing plates 21 and 21 are heat exchange tubes 11a and 11b,
The height position is adjusted so as to maintain the spiral shape of 11c.

Then, as shown in FIG. 4, each support 2
The heat exchange tube 11 is formed by the holes 33, 33 formed by combining the cutouts 30, 30 formed in 3, 25, 27, 29 so as to face each other.
A, 11b and 11c are sandwiched. That is, the support 23 is fixed by a fastener (not shown) such as a screw so that one end of the side surface where the notches 30 and 30 are not formed is located substantially in the center of the fixing plate 21. Then, the notch 30, 30 on one side of the support 25 and the support 23 having the notch 30, 30 on both side surfaces are formed.
When the holes 33, 33 are formed at positions where the holes 33, 33 are formed by combining with the notches 30, 30 formed in the above, the both are fixed by the fastener. Similarly, the notches 30, 30 formed in the support 25 and the support 29.
The holes 33 and 33 are fixed at positions where the holes 33 and 33 are formed, and the positions where the holes 33 and 33 are formed by the notches 30 and 30 formed in the support 29 and the support 27. By the way, both are fixed.

Although various solutions can be stored in the tank 10, when the heat exchanger 1 is a solution and / or suspension containing valuable metals in the leaching process of metal smelting as in the present embodiment. The acid or alkaline solution is stored in the heat exchange tube, and a rapid temperature change may occur due to an exothermic reaction or an endothermic reaction. Therefore, the heat exchange tubes 11a, 11b, 11c.
Including fixed plate 21 and supports 23, 25, 27, 29
Is preferably formed of a material having excellent chemical resistance and heat resistance. For example, heat exchange tubes 11a, 1
1b and 11c are preferably made of synthetic resin such as Teflon or polyflon, and the fixing plate 21 and the supports 23, 25, 27 and 29 are made of, for example, glass fiber reinforced plastic (FRP), Teflon or polypropylene. It is preferable.

Heat exchange tubes 11a, 11b, 11c
The notch 3 of each support 23, 25, 27, 29
A cushion material 40 having elasticity is coated on the outer peripheral surface located in the portion sandwiched by the holes 33, 33 formed by 0, 30 (see FIG. 3A). The cushion material 40 is also preferably made of a material having excellent chemical resistance and heat resistance, for example, a thickness of about 1 mm.
A Teflon soft seal or a Teflon seal tape having a thickness of about 0.1 mm can be used. Specifically, the product name "Dragonfly NO. 9096" manufactured by Nichias Co., Ltd. can be used for the soft seal, and the product name "Dragonfly NO. 9082" manufactured by the same company can be used for the seal tape. The thickness of the heat exchange tubes 11a, 11b, 11c is 0.1 m due to the clearance between the outer peripheral surface and the holes 33, 33.
It is possible to properly select and use a thickness of about m to 2 mm.

Further, a protective member 41 is covered from above the cushion material 40 so as to cover the cushion material 40 (see FIG. 3B). The protection member 41 is covered from above the cushion material 40 by making a cut on the side surface of the tube having a diameter slightly larger than that of the heat exchange tubes 11a, 11b, 11c. The protection member 41 is used to prevent the cushion material 40 from being displaced or peeled off. The protective member 41 is also preferably made of a material having excellent chemical resistance and heat resistance, for example, synthetic resin such as Teflon.

Heat exchange tubes 11a, 11b, 11c
In order to fix the inside of the tank 10, first, each fixing plate 21, 21
After attaching the supports 23, 23, respectively, a portion where the cushion material 40 and the protection member 41 are coated on the outer peripheral surface of the heat exchange tube 11a is located in the notches 30, 30 formed on the side surfaces of the support 23. The interior of the tank 10 is as described above. Then, the notches 30, 30 formed on the side surface of the support 25 are brought into close contact with the protection member 41 covered with the heat exchange tube 11a, and the support 25 is attached to the support 23 in this state. Next, the heat exchange tube 11b is attached to the notches 30 and 30 of the support 25 formed on the side opposite to the above.
Inside the tank 10 so that the protection member 41 covered by the outer peripheral surface thereof is located, and supports the support 29 in a state where the notches 30 formed on the side surfaces of the support 29 are in close contact with the protection member 41. Attach to 25. Finally, the heat exchange tube 11c is internally provided in the tank 10 in the notches 30 and 30 of the support 29 formed on the opposite side to the position described above so that the protection member 41 covered by the outer peripheral surface thereof is located, and the support 27 The support 27 is attached to the support 29 in a state where the notches 30 formed on one side surface of the support member 41 are in close contact with the protection member 41. As a result, the gap between the protective member 41 and the holes 33, 33 is eliminated, and the protective member 41 and the holes 33 are closely fixed.

[0022]

According to the present invention, since the heat exchange tube and the support can be fixed in close contact with each other without causing a gap, the heat exchange tube and the support are slid and damaged. This has the effect of preventing this.
In addition, such a fixing structure has an effect that the heat exchange tube can be easily installed inside the tank.

Further, according to the present invention, since the protection member is coated around the cushion material, it is possible to prevent the cushion material from being displaced or peeled off.

Further, according to the present invention, even when the solution is heated to a high temperature due to an exothermic reaction, such as a solution and / or a suspension containing a valuable metal in the leaching step of metal smelting, expansion and contraction due to thermal change occurs. Even if it occurs, it does not create a gap between the heat exchange tube and the support, and it prevents hard particles from entering the gap and can firmly fix them firmly, so that the heat exchange tube and the support can be fixed. There is an effect that it is possible to prevent scratches from being scratched and damaged.

[Brief description of drawings]

1A is a plan view of a heat exchanger, and FIG. 1B is a plan view in which a fixed portion of a heat exchange tube is enlarged.

FIG. 2 is a side sectional view of the heat exchanger of FIG.

FIG. 3A is a perspective view showing a cushion material covered with a heat exchange tube, and FIG. 3B is a perspective view showing a protection member put on the cushion material.

FIG. 4 is an exploded perspective view showing an embodiment of a fixing structure of a heat exchange tube of a heat exchanger according to the present invention.

FIG. 5 is a perspective view showing a fixing plate and a support.

FIG. 6 is a flow chart of hydrometallurgy.

[Explanation of symbols]

1 heat exchanger 10 tanks 10c inner wall 11a, 11b, 11c Heat exchange tube 12 branch pipes 13a, 13b, 13c Connection pipe 15a, 15b, 15c Flexible tube 17a, 17b, 17c Connection pipe 18 Branch pipe 19a, 19b, 19c Flexible tube 20 Fixed part 21 Fixed plate 23, 25, 27, 29 support 30 notch 33 holes 40 cushion material 41 Protective member

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-11-230692 (JP, A) JP-A-58-164997 (JP, A) JP-A-54-36653 (JP, A) Sankaihei 1- 117469 (JP, U) Actual opening 2-122985 (JP, U) Actual opening Sho 49-126653 (JP, U) Actual opening Sho 53-103970 (JP, U) Actual opening Sho 42-21079 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F28F 9/00 311

Claims (4)

(57) [Claims] 1. A heat exchange tube which is disposed in a tank in which a liquid is stored and which flows a heat exchange medium for heating or cooling the liquid, the tube being formed of a synthetic resin having heat resistance and chemical resistance. At the same time, the heat exchange tubes, which are covered with a cushioning material having elasticity at predetermined positions on the outer peripheral surface thereof, are provided on their side surfaces at predetermined intervals with notches so as to substantially match the shape of the outer peripheral surface of the heat exchange tube. Heat exchange in which the cushion material portion of the heat exchange tube is tightly clamped and fixed by holes formed by combining a plurality of plate-shaped supports formed so that the notches face each other. Tube heat exchange tube fixing structure. 2. The fixing structure for a heat exchange tube of a heat exchanger according to claim 1, wherein a protective member is further coated around the cushion material so as to cover the cushion material. Characteristic heat exchanger tube fixing structure for heat exchanger. 3. The heat exchange tube fixing structure for a heat exchanger according to claim 1 or 2, wherein the cushion material and / or the protection member is formed of a synthetic resin having heat resistance and chemical resistance. The fixing structure of the heat exchange tube of the heat exchanger, which is characterized in that 4. The fixing structure for a heat exchange tube of a heat exchanger according to claim 1, wherein the liquid is a solution containing a valuable metal in a leaching step of metal smelting and / or Alternatively, the fixing structure of the heat exchange tube of the heat exchanger, which is a suspension.