System for treating suspended matter in copper electrolyte

Abstract

The present application belongs to the field of copper smelting, and particularly relates to a system for processing suspended matter in copper electrolyte. Overflow liquid pipes and high-end liquid discharge pipes of electrolytic cells are respectively connected to supernatant overflow of a sedimentation tank after sedimentation to a circulating electrolyte low tank. A low-end liquid discharge pipe of the electrolytic cell is connected to a thickening tank. A supernatant overflow port of the thickening tank is connected to a liquid inlet of a first filter press. A liquid outlet of the first filter press enters the circulating electrolyte low tank. A liquid outlet of the circulating electrolyte low tank is connected to a liquid inlet of the electrolytic cell. The above scheme processes electrolyte containing suspended matter produced by different stages of electrolysis and different liquid outlets according to the properties and content of the suspended matter, greatly improves the electrolyte circulation efficiency, and avoids the enrichment of suspended matter in the electrode liquid to affect the electrolysis process and the quality of cathode copper.

Description

Technical Field

[0001] This invention belongs to the field of copper smelting, and specifically relates to a system for treating suspended solids in copper electrolyte. Background Technology

[0002] During the copper electrolytic refining stage, the anode plate has a complex composition, containing various insoluble substances and impurities. During electrolysis, these impurities continuously form anode sludge (mainly containing insoluble substances such as copper, gold, silver, lead, antimony, and bismuth) and other fine suspended solid particles (collectively referred to as suspended matter) in the electrolyte. These suspended matter adheres to the surface of the electrolytic copper, thus reducing its quality. Therefore, during copper electrolysis, the electrolyte in the electrolytic cell is always in a circulating state; that is, the electrolyte overflows at a certain flow rate, enters the electrolyte circulation and purification system for treatment, and is then recycled. However, the overflow contains a small amount of suspended matter with small particle size and poor settling properties. This overflow directly enters the electrolyte circulation system, where these suspended matter continuously accumulates, leading to problems such as decreased cathode copper quality, reduced electrolysis efficiency, equipment wear and blockage, and increased additive consumption.

[0003] Therefore, solving the problem of increased suspended solids content in circulating electrolyte is of great significance to electrolysis cost, electrolysis efficiency, and cathode copper quality. Summary of the Invention

[0004] The purpose of this invention is to provide a system for treating suspended solids in copper electrolyte, which can treat electrolytes with different suspended solids contents in a targeted manner to improve electrolyte circulation efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a system for treating suspended solids in copper electrolyte, wherein the overflow pipe and the high-end drain pipe of the electrolytic cell are respectively connected to the supernatant overflowing from the settling tank to the low-level circulating electrolyte tank, the low-end drain pipe of the electrolytic cell is connected to the thickening tank, the overflow port of the supernatant of the thickening tank is connected to the inlet of the first filter press, the outlet of the first filter press enters the low-level circulating electrolyte tank, and the outlet of the low-level circulating electrolyte tank is connected to the electrolyte inlet of the electrolytic cell.

[0006] The above scheme treats the electrolyte containing suspended solids produced at different stages of electrolysis and from different outlets according to the nature and content of the suspended solids. Overflow and small-scale blockage solutions contain only small amounts of fine, slow-settling suspended solids, which can be directly recycled into the electrolyte after settling. Large-scale blockage solutions, which are slurry-like and contain larger, faster-settling particles, are first treated in a thickener. Overflow solutions still containing a small amount of suspended solids are then filtered before being recycled into the electrolyte. Because large-scale blockage solutions have high but small amounts of suspended solids, while overflow and small-scale blockage solutions have large volumes but low suspended solids, this targeted treatment scheme significantly improves the electrolyte recycling efficiency and prevents the accumulation of suspended solids in the electrode solution, which could affect the electrolysis process and the quality of the cathode copper. Attached Figure Description

[0007] Appendix Figure 1 This invention relates to a system for treating suspended solids in copper electrolyte. Detailed Implementation

[0008] The invention will now be described in further detail with reference to the accompanying drawings.

[0009] A system for treating suspended solids in copper electrolyte is provided, wherein the overflow pipe 11 and the high-end drain pipe 12 of the electrolytic cell 10 are respectively connected to the supernatant overflowing from the settling tank to the low-level circulating electrolyte tank 21, the low-end drain pipe 13 of the electrolytic cell 10 is connected to the thickening tank 30, the supernatant overflow port 31 of the thickening tank is connected to the inlet of the first filter press 50, the effluent from the first filter press 50 enters the low-level circulating electrolyte tank 21, and the outlet of the low-level circulating electrolyte tank 21 is connected to the electrolyte inlet of the electrolytic cell 10.

[0010] Electrolytic cell 10 is a sloping-bottomed tank with one end higher than the other. Each end of the bottom has an outlet. When electrolysis is finished and the electrolytic cell 10 is drained, the higher outlet drains first. The electrolyte discharged at this time is called the small plugging liquid, which contains suspended solids with fine particles and slow settling. After the high outlet drains, only the electrolyte remaining at the bottom of the electrolytic cell remains. Because the heights at the two ends of the bottom are different, this part of the electrolyte cannot be discharged from the high outlet. At this time, the lower outlet can be opened to drain the electrolyte. The electrolyte discharged at this time is called the large plugging liquid. The large plugging liquid is a slurry with faster settling and larger particles. Its concentration and properties are different from the small plugging liquid and the overflow liquid, so it is collected and treated separately.

[0011] An anode mud storage tank 40 is installed between the upper overflow port 31 of the thickening tank and the inlet of the first filter press 50 to stabilize the operating efficiency of the first filter press 50. Due to the high suspended solids content in the large plugging liquid, even after sedimentation treatment in the thickening tank 30, the upper overflow liquid remains turbid. Further treatment by the first filter press 50 separates the suspended solids, allowing the effluent to enter the circulating electrolyte low-level tank 21. The electrolyte in the circulating electrolyte low-level tank 21, after impurity removal treatment, is recycled into each electrolytic cell 10.

[0012] The thickening tank bottom outlet 32 ​​is connected to the second filter press 60, and the outlet of the second filter press 60 is connected to the inlet of the anode mud storage tank 40. The discharge from the thickening tank bottom outlet 32 ​​is anode mud slurry. After solid-liquid separation by the second filter press 60, the anode mud is transferred to the anode mud treatment system. The turbid filtrate enters the first filter press 50 for solid-liquid separation treatment after passing through the anode mud storage tank 40 to remove residual suspended solids. The effluent enters the circulating electrolyte low-level tank 21.

[0013] The overflow pipe 11 of the electrolytic cell 10 is connected to the inlet of the first settling tank 70. The supernatant overflow from the first settling tank 70 enters the circulating electrolyte low-level tank 21. The bottom outlet of the first settling tank 70 is connected to the precision filter press 90. The outlet of the precision filter press 90 enters the circulating electrolyte low-level tank 21. Because the overflow volume is extremely large and the suspended solids content is low, in the prior art, waste electrolyte is generally directly subjected to impurity removal processes such as electrowinning and copper removal before recycling. Therefore, suspended solids accumulate continuously during the electrolyte circulation process. However, this invention performs sedimentation treatment on the overflow. The supernatant after sedimentation enters the electrolyte circulation, and the sediment at the bottom of the settling tank is filtered by the precision filter press 90 before entering the electrolyte circulation. Since the suspended solids content in the overflow is very small, only a small precision filter press is needed to meet the operation requirements, which is very small in terms of both cost and space.

[0014] The high-end drain pipe 12 of the electrolytic cell 10 is connected to the second settling tank 80. The supernatant in the second settling tank 80 enters the low-level circulating electrolyte tank 21, and the underflow enters the first filter press 50. Similar to the overflow liquid, in the prior art, the small blockage liquid in the upper layer of the electrolytic cell, which has a very large volume and a small suspended solids content, is generally directly sent to the electrolyte impurity removal system for treatment and recycling. The suspended solids gradually accumulate in the electrolyte, which will affect the electrolysis operation and the quality of the cathode copper. The above solution introduces the small blockage liquid into the second settling tank 80 for settling. The supernatant after settling enters the electrolyte circulation, and the lower layer of sediment, which is smaller in volume, is treated by the first filter press 50 on the large blockage liquid treatment line. Preferably, the underflow of the second settling tank 80 enters the anode mud storage tank 40.

[0015] The outlet of the circulating electrolyte low-level tank 21 is connected to the high-level tank 22 via a pump-connected pipeline. The outlet pipe of the high-level tank 22 is connected to the electrolyte inlet pipe of the electrolytic cell 10. The bottom of the high-level tank 22 is higher than the edge of the electrolytic cell 10. During electrolysis, replenishing the electrolyte requires avoiding excessive flow rate that could disturb the electrolyte in the electrolytic cell 10. Therefore, the circulating electrolyte can first be pumped to the high-level tank 22 at the high level, and then naturally guided into the electrolytic cell 10 to control the flow rate and volume.

Claims

1. A system for treating suspended solids in copper electrolyte, characterized in that: The overflow pipe (11) and the high-end drain pipe (12) of the electrolytic cell (10) are respectively connected to the supernatant after sedimentation in the settling tank and overflow to the low-level circulating electrolyte tank (21). The low-end drain pipe (13) of the electrolytic cell (10) is connected to the thickening tank (30). The supernatant overflow port (31) of the thickening tank is connected to the inlet of the first filter press (50). The effluent from the first filter press (50) enters the low-level circulating electrolyte tank (21). The outlet of the low-level circulating electrolyte tank (21) is connected to the electrolyte inlet of the electrolytic cell (10).

2. The system for treating suspended solids in copper electrolyte according to claim 1, characterized in that: An anode mud storage tank (40) is provided between the upper overflow port (31) of the thickening tank and the inlet of the first filter press (50).

3. The system for treating suspended solids in copper electrolyte according to claim 1, characterized in that: The thickening tank bottom outlet (32) is connected to the second filter press (60), and the outlet of the second filter press (60) is connected to the inlet of the anode mud storage tank (40).

4. The system for treating suspended solids in copper electrolyte according to claim 1, characterized in that: The overflow pipe (11) of the electrolytic cell (10) is connected to the inlet of the first settling tank (70). The supernatant overflow of the first settling tank (70) enters the circulating electrolyte low-level tank (21). The bottom outlet of the first settling tank (70) is connected to the precision filter press (90). The liquid outlet of the precision filter press (90) enters the circulating electrolyte low-level tank (21).

5. The system for treating suspended solids in copper electrolyte according to claim 2, characterized in that: The high-end drain pipe (12) of the electrolytic cell (10) is connected to the second settling tank (80). The supernatant of the second settling tank (80) enters the low-level circulating electrolyte tank (21), and the underflow enters the first filter press (50).

6. The system for treating suspended solids in copper electrolyte according to claim 5, characterized in that: The underflow from the second settling tank (80) enters the anode mud storage tank (40).

7. The system for treating suspended solids in copper electrolyte according to claim 1, characterized in that: The outlet of the circulating electrolyte low-level tank (21) is connected to the high-level tank (22) via a pump-connected pipeline. The outlet pipe of the high-level tank (22) is connected to the electrolyte inlet pipe of the electrolytic cell (10). The bottom of the high-level tank (22) is higher than the edge of the electrolytic cell (10).

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