Microporous copper dissolving and liquid preparing device for producing ultra-thin lithium battery copper foil

Abstract

The invention discloses a micropore copper dissolving and liquid preparing device for producing ultra-thin lithium battery copper foil, which comprises a copper dissolving tank tower body, a dirty liquid tank, a copper supplementing pump, a copper supplementing pump, a copper supplementing pump, a copper supplementing pump, a copper supplementing pump, a copper supplementing pump, a copper supplementing pump, a copper supplementing pump, a copper supplementing pump, a copper supplementing pump, a copper supplementing pump, a copper supplementing pump and a copper supplementing pump, wherein the top inlet of the dirty liquid tank is connected with a liquid returning opening of a foil generating machine; the top liquid returning opening is connected with the copper dissolving tank tower body; the water return port is connected with the liquid outlet in the bottom of the copper dissolving tank tower body through the circulating pump, and the water outlet is connected with the liquid inlet of the copper dissolving tank tower body; the sieve plate is horizontally arranged at the bottom of the inner wall of the copper dissolving tank tower body; the liquid inlet pipe is arranged in the copper dissolving tank tower body, an annular pipe is arranged at the outlet end of the liquid inlet pipe, the annular pipe is arranged at the bottom of the copper dissolving tank tower body and located on the lower portion of the sieve plate, liquid outlet holes are evenly distributed in the pipe wall of the annular pipe, and the inlet end of the annular pipe is connected with a liquid inlet of the copper dissolving tank tower body; the air inlet pipe is arranged in the copper dissolving tank tower body, the inlet end of the air inlet pipe is connected with an external air supply system, and the outlet end is arranged at the bottom of the copper dissolving tank tower body.

Description

Technical Field

[0001] The invention relates to the technical field of copper dissolving and liquid making equipment for ultra-thin lithium battery copper foil, and in particular to a microporous copper dissolving and liquid making device for producing ultra-thin lithium battery copper foil. Background Art

[0002] The copper dissolving and liquid making process of lithium battery copper foil is a prerequisite for the production of lithium battery copper foil, and the efficiency of copper dissolving and liquid making is one of the key factors affecting the production of lithium battery copper foil. At present, with the thinning of lithium battery copper foil and the increase of production load, especially the production of 3.5μm~4.5μm copper foil, there are higher requirements for the impurity content of the solution and the copper dissolving efficiency. At present, the copper dissolving devices for preparing copper foil are mostly immersion type and spray type. The immersion type copper dissolving device can meet the solution cleanliness requirements, but it is necessary to increase the copper raw material to meet the high load operation. Although the spray type copper dissolving device has less copper material input, the cleanliness of the solution must meet the requirements of raw foil, and the pinholes on the surface of the copper foil are difficult to control. Summary of the invention

[0003] In view of the above technical problems, the present invention provides a microporous copper dissolving liquid preparation device for producing ultra-thin lithium battery copper foil.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows: A microporous copper dissolving liquid making device for producing ultra-thin lithium battery copper foil, comprising: Copper dissolving tank tower: The top inlet of the dirty liquid tank is connected to the liquid return port of the raw foil machine, the top liquid return port is connected to the copper dissolving tank tower body through the liquid return pipe, and the bottom outlet is connected to the copper replenishing pipe in the copper dissolving tank tower body through the copper replenishing pump; The heat exchanger, the water return port is connected to the bottom liquid outlet of the copper dissolving tank tower body through a circulating pump, and the water outlet is connected to the liquid inlet of the copper dissolving tank tower body; The sieve plate is horizontally arranged at the bottom of the inner wall of the copper dissolving tank tower body; The liquid inlet pipe is arranged in the copper dissolving tank tower body, and an annular pipe is arranged on the outlet end thereof. The annular pipe is arranged at the bottom of the copper dissolving tank tower body and is located at the lower part of the sieve plate. Liquid outlet holes are evenly distributed on the wall of the annular pipe; and the inlet end thereof is connected to the liquid inlet of the copper dissolving tank tower body; An air inlet pipe is arranged in the copper dissolving tank tower body, an inlet end of which is connected to an external air supply system, and an outlet end is arranged at the bottom of the copper dissolving tank tower body; The first membrane tube and the second membrane tube are arranged at the bottom of the inner wall of the copper dissolving tank tower body and located at the lower part of the annular tube, and their inlet ends are respectively communicated with the outlet ends of the air inlet pipe.

[0005] The aperture of the liquid outlet is 8 mm.

[0006] The invention also comprises a bracket which is arranged at the bottom of the inner wall of the copper dissolving tank tower body, and the sieve plate is horizontally installed on the bracket.

[0007] The pore size of the first membrane tube and the second membrane tube is 0.1 μm.

[0008] The first membrane tube and the second membrane tube are both made of polypropylene.

[0009] The beneficial effects of the present invention are as follows: the present invention utilizes the micropores of the membrane tube to disperse bubbles into the copper dissolving tank, and simultaneously transports the solution after external self-circulation heating to the bottom of the tank, so that the oxygen introduced from the bottom and the heated solution are in an upward flow direction and form an S-shaped flow route, slowly moving from bottom to top, and realizing uniform alternating contact between oxygen and sulfuric acid and metallic copper, so that the copper in the copper dissolving tank participates in the dissolution reaction, thereby ensuring the balance of copper, acid and temperature. The present invention further increases the contact area between the copper material and oxygen and sulfuric acid, improves the copper dissolving efficiency, reduces the copper storage tank, reduces energy loss, and improves economic benefits. The present invention realizes uniform alternating contact between oxygen and sulfuric acid and metallic copper, so that the copper in the copper dissolving tank participates in the dissolution reaction. When the copper dissolving temperature is controlled at 50-60°C and the compressed air volume is controlled at 400-500Nm3 / h, the copper ion concentration growth rate of the copper dissolving tank is 8-9g / Lh, and the copper dissolving rate is 3-5 times that of the existing domestic copper dissolving technology, which reduces the consumption of steam and air volume, improves the copper dissolving efficiency, reduces the frequency of equipment maintenance, and improves production benefits. At the same time, the small flow copper filling method and immersion structure can effectively solve the generation of copper foil pinholes. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention is further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the present invention; Figure 2 It is a schematic diagram of the internal structure of the copper dissolving tank tower body of the present invention.

[0011] Figure 3 It is a cross-sectional view of the bottom of the copper dissolving tank tower body of the present invention. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0013] like Figures 1 to 3As shown, a microporous copper dissolving liquid making device for producing ultra-thin lithium copper foil comprises: a copper dissolving tank tower body 7: a dirty liquid tank 10, the top inlet of which is connected to the liquid return port of the raw foil machine, the top liquid return port is connected to the copper dissolving tank tower body 7 through a liquid return pipe, and the bottom outlet is connected to the copper replenishing pipe in the copper dissolving tank tower body 7 through a copper replenishing pump 11; a heat exchanger 9, the water return port is connected to the bottom liquid outlet 12 of the copper dissolving tank tower body 7 through a circulating pump 8, and the water outlet is connected to the liquid inlet of the copper dissolving tank tower body 7; a sieve plate 5 is horizontally arranged at the bottom of the inner wall of the copper dissolving tank tower body 7; a liquid inlet pipe 4 is arranged in the copper dissolving tank tower body 7, and an annular pipe is arranged on the outlet end of the copper dissolving tank tower body 7, and the annular pipe is arranged at the bottom of the copper dissolving tank tower body 7 and is located at the lower part of the sieve plate 5. Liquid outlet holes are evenly distributed on the wall of the annular tube; its inlet end is connected to the liquid inlet of the copper dissolving tank tower body 7; the air inlet pipe 3 is arranged in the copper dissolving tank tower body 7, its inlet end is connected to the external air supply system, and the outlet end is arranged at the bottom of the copper dissolving tank tower body 7; the first membrane tube 1 and the second membrane tube 2 are arranged at the bottom of the inner wall of the copper dissolving tank tower body 7, and are located at the lower part of the annular tube, and their inlet ends are respectively connected to the outlet end of the air inlet pipe 3, and the aperture of the liquid outlet hole is 8mm. The present invention also includes a bracket 6, which is arranged at the bottom of the inner wall of the copper dissolving tank tower body 7, and the sieve plate 5 is horizontally installed on the bracket 6. The aperture of the first membrane tube 1 and the second membrane tube 2 is 0.1μm, and the first membrane tube 1 and the second membrane tube 2 are both polypropylene membrane tubes.

[0014] When the present invention is in use, the copper dissolving tank body 7 to the dirty liquid tank 10 is controlled by the copper replenishing pump 11 to replenish the amount of copper for production, and the copper material is attached to the sieve plate 5. At the same time, the dirty liquid tank 10 to the copper dissolving tank body 7 is replenished with acid at a small flow rate, and the acid liquid continuously flows into the copper dissolving tank body 7 through the liquid outlet holes evenly distributed on the wall of the annular pipe. The copper dissolving tank body 7, the circulating pump 8 and the heat exchanger 9 form a large-flow self-circulating heating, and the air supply system enters the copper dissolving tank tower body 7 through the air inlet pipe 3, and realizes oxygen supply to the copper dissolving tank tower body 7 through the first membrane tube 1 and the second membrane tube 2. The above-mentioned process reaction conditions are ready, so that the copper material is in contact with oxygen and sulfuric acid to the greatest extent and reacts, thereby improving the copper dissolving efficiency, reducing the copper storage tank, reducing energy loss, and improving economic benefits.

[0015] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A microporous copper dissolving liquid preparation device for producing ultra-thin lithium battery copper foil, characterized in that: include: Copper dissolving tank tower (7): The top inlet of the dirty liquid tank (10) is connected to the liquid return port of the foil machine, the top liquid return port is connected to the copper dissolving tank tower body (7) through a liquid return pipe, and the bottom outlet is connected to the copper replenishing pipe in the copper dissolving tank tower body (7) through a copper replenishing pump (11); The heat exchanger (9) has a water return port connected to a bottom liquid outlet (12) of the copper dissolving tank tower body (7) through a circulation pump (8), and a water outlet connected to a liquid inlet of the copper dissolving tank tower body (7); The sieve plate (5) is horizontally arranged at the bottom of the inner wall of the copper dissolving tank tower body (7); A liquid inlet pipe (4) is arranged in the copper dissolving tank tower body (7), and an annular pipe is arranged on the outlet end thereof. The annular pipe is arranged at the bottom of the copper dissolving tank tower body (7) and is located at the lower part of the sieve plate (5), and liquid outlet holes are evenly distributed on the wall of the annular pipe; and an inlet end thereof is connected to the liquid inlet of the copper dissolving tank tower body (7); An air inlet pipe (3) is arranged in the copper dissolving tank tower body (7), the inlet end of which is connected to an external air supply system, and the outlet end of which is arranged at the bottom of the copper dissolving tank tower body (7); The first membrane tube (1) and the second membrane tube (2) are arranged at the bottom of the inner wall of the copper dissolving tank tower body (7) and located at the lower part of the annular tube, and their inlet ends are respectively connected to the outlet ends of the air inlet pipe (3).

2. The microporous copper dissolving liquid making device for producing ultra-thin lithium battery copper foil according to claim 1 is characterized in that: The aperture of the liquid outlet is 8 mm.

3. The microporous copper dissolving liquid making device for producing ultra-thin lithium battery copper foil according to claim 1, characterized in that: It also includes a bracket (6) arranged at the bottom of the inner wall of the copper dissolving tank tower body (7), and the sieve plate (5) is horizontally mounted on the bracket (6).

4. The microporous copper dissolving liquid making device for producing ultra-thin lithium battery copper foil according to claim 1, characterized in that: The pore diameter of the first membrane tube (1) and the second membrane tube (2) is 0.1 μm.

5. The microporous copper dissolving liquid making device for producing ultra-thin lithium battery copper foil according to claim 1, characterized in that: The first membrane tube (1) and the second membrane tube (2) are both membrane tubes made of polypropylene.

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