JP2003222408A - Combustion device in liquid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion device in a liquid capable of preventing its corrosion caused by a concentrated liquid received from a pure liquid electrolysis process for copper electrolysis and having excellent productivity and workability. <P>SOLUTION: This combustion device in the liquid has a first vessel 1 which receives the liquid 10 supplied from the pure liquid electrolysis process for copper electrolysis and heats and evaporates it by a combustion flame 3A in the liquid to concentrate it and a second vessel 2 from which the liquid is discharged from a bottom part under liquid circulation with the first vessel. An outer shell 20 of the vessel is lined by fluororesin lining 23. Furthermore, the device has a fluororesin-made tube 30 which is wound around the first vessel and/or the second vessel, whose liquid inlet 30A is connected to a liquid supply outlet in the pure liquid electrolysis process, and whose liquid outlet 30B is connected to a liquid receive port 1A of the first vessel. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged combustion apparatus, and more particularly to a submerged combustion apparatus for concentrating an electrolytic solution prior to recovering Ni from a solution obtained by electrolysis of a copper electrolytic solution.

[0002]

2. Description of the Related Art FIG. 3 is a schematic side sectional view showing a conventional example of a submerged combustion apparatus. This equipment was supplied from the clean electrolytic process of copper electrolysis, the Cu concentration was about 1 g / L or less, and the sulfuric acid concentration was 250 g / L.
Liquid, which is composed of an aqueous solution having a Ni concentration of about 15 g / L, is received from the liquid receiving port 1A at 10 to 25 L / min, and heated to 135 to 160 ° C by the submerged combustion flame 3A from the submerged combustion device 3. A first container (concentrating can) 1 that is concentrated to about 4 times the Ni concentration by evaporation, and a second container (setler) from which liquid is extracted from the bottom under liquid circulation between the first container 1 and the first container 1. ) 2 and.

The submerged combustion device 3 mixes air 13 and fuel (kerosene, etc.) 14 and ignites it with ignition fuel (LPG, etc.) 12 to generate submerged combustion flame 3A. The exhaust gas 11 generated by evaporation is
It is sent from the dilute sulfuric acid scrubber to the cyclone via the gas-liquid separation chamber 5. The liquid circulation between the first and second containers 1 and 2 is
It is performed through the air lift pipe 6 and the overflow pipe 7. The internal pressure of the first container 1 is controlled to be constant and uniform, and the liquid inside the first container 1 is pushed up into the air lift pipe 6 by this internal pressure and flows into the second container 2, and the second container 1 The excess amount of the liquid flowing into 2 is returned to the first container 1 from the overflow pipe 7.

About 130 to 150 ° C. stored in the second container 2
A certain amount of concentrated liquid is withdrawn from the bottom of the container via the extraction pipe 8 and supplied to the cooling tank 4. In the cooling tank 4,
About 40-60 while stirring the supplied concentrate with the impeller 9.
After cooling to about 0 ° C., Ni in the concentrated liquid is crystallized as crude nickel sulfate, and the crystallized liquid 15 is subjected to solid-liquid separation in a centrifuge (not shown) to recover crude nickel sulfate crystals. At this time, it is possible to increase the crystallization of crude nickel sulfate by strengthening the cooling in the cooling tank.

In the first container, an outer shell 20 is made of a SUS304 steel plate having a plate thickness of 8 to 20 mm, and a lead lining 21 is formed on the inner surface thereof.
The acid-resistant brick 22 is lined with a thickness of 150 to 250 mm. The outer shell 20 of the second container has a plate thickness of 5 to 15
It is made of SUS304 steel plate of about mm, and the inner surface is lined with acid resistant brick 22 through lead lining 21 with a thickness of about 80 to 200 mm.

[0006]

In the conventional submerged combustion apparatus, acid resistant bricks are used for the lining of the first and second containers as described above. However, although it is an acid-resistant brick, the deterioration of the brick is unexpectedly severe, probably because the liquid during treatment becomes high temperature and strong acid, and the corrosion of the brick due to the penetration of the liquid
There was a problem that the repair period was short due to the rapid progress of falling and corrosion of outer wall plates. In addition, there is a problem in that the bricks fallen off due to the corrosion and the deposits adhere to various pipes connected to the first and second containers to cause clogging, which deteriorates productivity and workability.

It is an object of the present invention to solve this problem and to provide a submerged combustion apparatus which is less likely to be corroded by a concentrated liquid received from a purified electrolytic process of copper electrolysis and which is excellent in productivity and workability. To do.

[0008]

DISCLOSURE OF THE INVENTION The present invention is directed to a first container for receiving a liquid provided from a purified electrolytic process of copper electrolysis, concentrating it by heating and evaporating it in a submerged combustion flame, and the first container. 1
In a submerged combustion device having a second container from which a liquid is extracted from the bottom under liquid circulation with the container, the outer shell of the container is lined with a fluororesin lining. is there. In the present invention, a fluororesin wrapped around the first container and / or the second container, the liquid inlet being connected to the liquid supply outlet of the purified liquid electrolysis step, and the liquid outlet being connected to the liquid receiving port of the first container. It is preferable to have a manufacturing tube.

[0009]

1 is a schematic side sectional view showing a first example of the present invention. In FIG. 1, reference numeral 23 denotes a fluororesin lining, and the same or corresponding members as those in FIG. As shown in FIG. 1, in the submerged combustion apparatus of the present invention, the linings of the first and second containers 1 and 2 are replaced by a conventional lead lining + acid-resistant brick and a fluororesin lining 23 is used. This was done by the inventors' earnest studies and experiments, and the fluororesin lining was concentrated by receiving the liquid delivered from the liquid electrolysis process of copper electrolysis and heating and evaporating it in a submerged combustion flame. This is because it was found that the corrosion resistance to the above-mentioned liquid is large and it is difficult to deteriorate.

As a result, many advantages are obtained as follows. (1) Since no acid-resistant bricks are used in the container, clogging of the pipes due to the falling of bricks and the adhesion of sediment does not occur, and productivity and workability are improved. (2) The fluororesin lining has a smoother surface than acid-resistant bricks, which facilitates regular cleaning, shortens work time, and improves workability. (3) Whereas the conventional lead lining + acid-resistant brick required a thickness of about 200 mm (there were still the above problems), the fluororesin lining had a thickness of about 2 mm to provide a sufficient outer shell. Can be protected. Therefore, the thickness of the lining can be greatly reduced and the container can be made compact.
The installation space can be reduced. (4) For acid-resistant bricks, if somewhere is damaged, the surroundings of the damaged area will be deteriorated due to the permeation of the liquid.
Due to the subsequent damage, partial repair cannot be done and the entire surface will be repaired. On the other hand, with the fluororesin lining, the liquid is less likely to permeate, so that partial repair is possible when damaged.

Further, in the present invention, as shown as a second example in FIG. 2, the second container 2 is wrapped around, the liquid inlet 30A is connected to the liquid supply / outlet of the solution electrolysis process, and the liquid outlet 30B is the first. Container 1
It is preferable to have a fluororesin tube 30 connected to the liquid receiving port 1A. As a result, the heat dissipated in the second container 2 can be used to preheat the liquid before it is received in the first container 1, and the same evaporation efficiency can be obtained even if the heating power of the submerged combustion flame is reduced. Since it can be maintained, the amount of kerosene 14 supplied to the submerged combustion device 3 can be reduced. Further, since the tube through which the liquid is passed is a fluororesin tube, it has a large corrosion resistance to the liquid, is not clogged with the sediment, and can have a long exchange period.

The fluororesin tube has a second
It may be wound around the first container instead of the above container, or may be wound around both the first and second containers.

[0013]

[Example] Purified solution in copper electrolysis Solution after electrolysis (Cu: 1.0 g / L
Hereinafter, in the step of recovering Ni from an aqueous solution of Ni: 12.4 g / L and H ₂ SO ₄ : 273 g / L, the submerged combustion apparatus shown in FIG. 3 has been conventionally used. This device operates at a receiving liquid amount of about 550 L / h, a heating temperature due to a submerged combustion flame of about 145 ° C., and a concentrated liquid amount of about 140 L / h. The outer shell of the concentration can (first container) and setler (second container) has a plate thickness of 12 mm (the setler has a plate thickness of 9 mm).
It was made of SUS304 steel plate, and the inner lining was made of lead lining + acid-resistant brick with a thickness of 200 mm (120 mm for setler), but there were the problems mentioned above.

Therefore, according to the present invention, as shown in FIG. 1, the linings of the concentration can and the setler are changed to a Teflon lining having a thickness of 2 mm. Teflon is a polymer of tetrafluoroethylene C ₂ F ₄ (a kind of fluororesin; originally a trade name). As a result, the clogging of the pipes was almost eliminated, and the in-container repair cycle was extended to about twice that of the conventional case. Therefore, according to the present invention, as shown in FIG. 2, a tube made of Teflon is wound around a setler, and the liquid is passed through the setler before being introduced into a concentration can. As a result, the liquid is effectively preheated, the amount of kerosene used per hour is reduced, and the amount of Ni recovered per liter of kerosene is reduced from 1186.6kg to 1554.8kg, which is about 31%.
I was able to increase the amount.

[0015]

EFFECTS OF THE INVENTION According to the present invention, there is an excellent effect that workability and productivity in the step of recovering Ni from a solution after purified electrolysis in copper electrolysis are remarkably improved.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view showing a first example of the present invention.

FIG. 2 is a schematic side sectional view showing a second example of the present invention.

FIG. 3 is a schematic side sectional view showing a conventional example.

[Explanation of symbols]

1 First container (concentrated can) 1A liquid receiving port 2 Second container (setler) 3 Submerged combustion equipment 3A Liquid combustion flame 5 gas-liquid separation chamber 6 Air lift pipe 7 overflow pipe 8 Extraction pipe 9 Impeller 10 liquid 11 Exhaust gas 12 Ignition fuel (LPG, etc.) 13 air 14 Fuel (kerosene, etc.) 15 Crystallized liquid 20 outer shell 21 Lead lining 22 Acid-resistant brick 23 Fluorine resin lining 30 Fluororesin tube 30A liquid inlet 30B liquid outlet

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // C22B 7/00 C22B 7/00 G (72) Inventor Yasushige Araki 6-Hibichi, Tamano-shi, Okayama − 1-1 Mitsui Mining & Smelting Co., Ltd. F-term in Hibi refinery (reference) 4G075 AA13 AA37 AA53 BB01 BB02 BB10 CA02 DA02 EA05 EB01 FB12 FC09 4K001 AA09 BA21 DB38 4K058 AA22 BA21 BB03 BB04 CA04 DD30 FC12

Claims (2)

[Claims] 1. A first container for concentrating by receiving a liquid supplied from a purified liquid electrolysis step of copper electrolysis and heating and evaporating it in a submerged combustion flame, and under liquid circulation between the first container and the first container. In a submerged combustion device having a second container for extracting the liquid from the bottom part thereof, the outer shell of the container is lined with a fluororesin lining. 2. Fluorine wrapped around the first container and / or the second container, the liquid inlet of which is connected to the liquid supply outlet of the purification electrolysis step and the liquid outlet of which is connected to the liquid receiving port of the first container. The submerged combustion device according to claim 1, further comprising a resin tube.