Adjusting system and adjusting method for copper and zinc ion concentration in steel cord drawing liquid tank liquid

Abstract

The invention discloses a system and a method for adjusting the concentration of copper and zinc ions in a steel cord drawing liquid bath solution, which can effectively shorten the aging time of a newly prepared steel cord drawing liquid so as to improve the processing efficiency. The problem that non-system anions are introduced into the system due to the existing method for improving the zinc ion concentration can be effectively avoided; according to the method disclosed by the invention, the lubricating property of the steel cord drawing liquid is effectively prolonged by timely and quickly reducing the copper ion concentration, and the problems of high consumption of the drawing liquid and high drainage treatment cost caused by a liquid drainage and liquid supplement mode are avoided.

Description

Technical Field

[0001] This invention relates to a system for adjusting the concentration of copper and zinc ions in a steel cord drawing solution bath, and also to a method for adjusting the concentration of copper and zinc ions in a steel cord drawing solution bath based on the above-mentioned system. Background Technology

[0002] Steel cord drawing fluid is used for drawing steel cords used in automobile tires. Steel cords are high-carbon steel with a brass-clad structure. During the drawing process, zinc and copper ions from the brass on the surface of the steel cord enter the drawing fluid in ionic form. The entry of zinc ions into the drawing fluid improves and maintains its lubrication performance; however, an increase in copper ions in the fluid leads to a decrease in its lubrication performance.

[0003] Currently, the main methods for controlling copper and zinc ions in steel cord drawing solutions include: increasing the zinc ion concentration by adding chemical reagents to the solution, thereby accelerating the aging of the steel cord drawing solution; this method introduces non-system anions into the system; reducing the copper ion content in the steel cord drawing solution by draining and adding new solution; this method significantly increases the amount of drawing solution used and the cost of draining; or using the new steel cord drawing solution at a low speed initially to increase the zinc ion content in the solution; when a certain amount is reached, the drawing speed is gradually increased. This method is time-consuming, and the process generally takes about one week. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a system for adjusting the concentration of copper and zinc ions in a steel cord drawing solution. This system can effectively regulate the concentration of copper and zinc ions in the steel cord drawing solution, thereby accelerating the aging of the solution (rapidly increasing the concentration of zinc ions in the solution) and effectively extending the lubrication performance of the steel cord drawing solution (controlling the concentration of copper ions).

[0005] Technical Solution: The copper and zinc ion concentration adjustment system in the steel cord drawing solution of the present invention includes a first electrolytic cell, a second electrolytic cell, a pH adjustment tank, and a purification tank; wherein, the drawing solution tank sends the drawing solution to be adjusted into the first electrolytic cell, and the purification tank returns the adjusted drawing solution to the drawing solution tank; the first electrolytic cell includes a first outlet pipe, a second outlet pipe, and a third outlet pipe, the first electrolytic cell is connected to the second electrolytic cell through the first outlet pipe, the first electrolytic cell is connected to the purification tank through the second outlet pipe, and the first electrolytic cell is connected to the pH adjustment tank through the third outlet pipe; the second... The electrolytic cell includes outlet pipe I and outlet pipe II. The second electrolytic cell is connected to the purified liquid tank through outlet pipe I and to the pH adjustment tank through outlet pipe II. The pH adjustment tank is connected to the purified liquid tank through outlet pipe III. Both the first and second electrolytic cells are equipped with online copper-zinc ion content detectors. The pH adjustment tank, the first electrolytic cell, and the second electrolytic cell are all equipped with online pH monitors (pH sensors). All outlet pipes are equipped with electrically controlled valves, and the electrically controlled valves, the online copper-zinc ion content detectors, and the online pH monitors are all connected to a PLC control box.

[0006] A filter is also installed on the connecting pipeline between the drawing liquid tank and the first electrolytic cell. The filter is used to filter the tank liquid and remove solid impurities in the tank liquid. It uses a filter cartridge and the filtration accuracy is no higher than 20 microns.

[0007] The pH adjustment tank is connected to an external alkanolamine storage tank, and the pH of the tank solution is adjusted by pumping alkanolamine solution into the pH adjustment tank; the pH adjustment tank is also equipped with a stirring device.

[0008] Feeding pumps are installed on the connecting pipes between the drawing liquid tank and the first electrolytic cell, as well as on the connecting pipes between the amine storage tank and the pH adjustment tank.

[0009] The anode of the first electrolytic cell is a zinc plate and the cathode is a copper plate; the anode of the second electrolytic cell is graphite and the cathode is a copper plate.

[0010] The method for adjusting the concentration of copper and zinc ions in the steel cord drawing solution based on the above-mentioned adjustment system is as follows: In the initial stage of the drawing solution (when it is first used), the zinc ion concentration in the drawing solution tank is less than 200 ppm. After filtration, the solution is pumped into the first electrolytic cell. In the first electrolytic cell, the solution is used as the electrolyte, and the anode material is a soluble zinc plate, which dissolves into the solution during electrolysis. Copper is deposited from the solution on the cathode, thereby rapidly increasing the zinc ion concentration. The solution then flows into the clean solution tank through the second outlet pipe, and then back into the drawing solution tank. This process is repeated until the zinc ion concentration in the solution reaches 700-800 ppm, at which point the circulation is stopped. After a period of use, such as 10-15 days, the solution is filtered and pumped into the first electrolytic cell. In the first electrolytic cell, the solution is used as the electrolyte. After the reaction in the first electrolytic cell, if the copper ion concentration is below 1000 ppm and the pH value of the solution is < 8.2, the solution enters the pH adjustment tank through the third outlet pipe. After the pH value is adjusted to > 8.2 in the pH adjustment tank, it enters the clean solution tank and then flows back to the drawing solution tank through the clean solution tank. If the copper ion concentration is below 1000 ppm and the pH value of the solution is > 8.2, the solution enters the clean solution tank through the second outlet pipe and then flows back to the drawing solution tank through the clean solution tank. After a period of use, such as 15-20 days, the solution is filtered and pumped into the first electrolytic cell. In the first electrolytic cell, the solution is used as the electrolyte. After the reaction in the first electrolytic cell, if the copper ion concentration is still higher than 1000 ppm, the solution is transferred to the second electrolytic cell through the first outlet pipe. In the second electrolytic cell, the solution is used as the electrolyte. The anode reaction provides electrons, and the cathode reaction converts divalent copper ions into metallic copper, thereby rapidly reducing the copper ion content in the solution. After the reaction in the second electrolytic cell, if the pH value of the solution is <8.2, it is transferred to the pH adjustment tank through outlet pipe II. After the pH value is adjusted to >8.2 in the pH adjustment tank, it is transferred to the clean solution tank and then returned to the drawing solution tank through the clean solution tank. If the pH value of the solution is >8.2, it is transferred to the clean solution tank through outlet pipe I and then returned to the drawing solution tank through the clean solution tank.

[0011] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The method of the present invention can effectively shorten the aging time of newly prepared steel cord drawing fluid, thereby improving processing efficiency, and can also effectively avoid the problem of introducing non-system anions into the system caused by the existing method of increasing zinc ion concentration; The method of the present invention can effectively extend the lubrication performance of steel cord drawing fluid by timely and rapidly reducing copper ion concentration, avoiding the problems of large consumption of drawing fluid and high cost of handling drainage caused by the draining and replenishing method. Attached Figure Description

[0012] Figure 1 This is a system schematic diagram of the regulating system of the present invention. Detailed Implementation

[0013] like Figure 1As shown, the system for adjusting the concentration of copper and zinc ions in the steel cord drawing solution of the present invention includes a first electrolytic cell, a second electrolytic cell, a pH adjustment tank, and a purification tank; wherein, the drawing solution tank sends the drawing solution to be adjusted into the first electrolytic cell, and the purification tank returns the adjusted drawing solution to the drawing solution tank; the first electrolytic cell includes a first outlet pipe, a second outlet pipe, and a third outlet pipe, the first electrolytic cell being connected to the second electrolytic cell through the first outlet pipe, the first electrolytic cell being connected to the purification tank through the second outlet pipe, and the first electrolytic cell being connected to the pH adjustment tank through the third outlet pipe; the second electrolytic cell contains... The system includes outlet pipe I and outlet pipe II. The second electrolytic cell is connected to the purified liquid tank via outlet pipe I, and the second electrolytic cell is connected to the pH adjustment tank via outlet pipe II. The pH adjustment tank is connected to the purified liquid tank via outlet pipe III. Both the first and second electrolytic cells are equipped with online copper-zinc ion content detectors. The pH adjustment tank, the first electrolytic cell, and the second electrolytic cell are all equipped with online pH monitors (pH sensors). All outlet pipes are equipped with electrically controlled valves, and the electrically controlled valves, the online copper-zinc ion content detectors, and the online pH monitors are all connected to a PLC control box.

[0014] The system includes a filter on the connecting pipe between the drawing solution tank and the first electrolytic cell. This filter removes solid impurities from the solution using a filter cartridge, with a filtration accuracy of no more than 20 micrometers. Feed pumps are installed on both the connecting pipe between the drawing solution tank and the first electrolytic cell, as well as on the connecting pipe between the amine storage tank and the pH adjustment tank. The pH adjustment tank is connected to an external amine storage tank, and the pH of the solution is adjusted by pumping amine solution into it. A stirring device is also installed inside the pH adjustment tank. The anode of the first electrolytic cell is a zinc plate, and the cathode is a copper plate; the anode of the second electrolytic cell is graphite, and the cathode is a copper plate.

[0015] The method for adjusting the concentration of copper and zinc ions in the steel cord drawing solution based on the above-mentioned adjustment system is as follows: For steel cord drawing fluid (product model: Solvay), in the initial stage of new fluid application (just starting out), when the zinc ion concentration in the drawing fluid tank is below 200 ppm, the fluid is filtered and pumped into the first electrolytic cell. In the first electrolytic cell, the fluid is used as the electrolyte, and the anode material is a soluble zinc plate, which dissolves into the solution during electrolysis. Copper is deposited from the solution on the cathode. The flow rate of the fluid is 100 L / min, and the total electrode area is 5.22 m². 2 The electrode spacing is 1~4cm, the voltage is 3~6V, and the current density is 300~600A / m. 2After the reaction in the first electrolytic cell, the zinc ion concentration in the solution reaches 190-250 ppm (the anodic reaction converts metallic zinc into divalent zinc ions; the cathodic reaction converts divalent copper ions into metallic copper, thereby rapidly increasing the zinc ion concentration). The solution then flows through the second outlet pipe into the purification tank, and from there back into the drawing solution tank. This process is repeated until the zinc ion concentration in the solution reaches 700-800 ppm, at which point the circulation stops. This achieves the goal of rapidly increasing the zinc ion concentration. One cycle is completed at a flow rate of 100 L / min. Compared to the aging time of existing new steel cord drawing solutions, this invention saves one week in aging time.

[0016] After 15-20 days of use, the tank solution is filtered and pumped into the first electrolytic cell. In the first electrolytic cell, the tank solution is used as the electrolyte, the flow rate of the tank solution is 100 L / min, and the total electrode area is 5.22 m². 2 The electrode spacing is 1~4cm, the voltage is 3~6V, and the current density is 300-600A / m. 2 After the reaction in the first electrolytic cell, the copper ion concentration in the solution reaches 1200 ppm. Since the copper ion concentration is still higher than 1000 ppm, the solution is then introduced into the second electrolytic cell through the first outlet pipe. In the second electrolytic cell, the solution is used as the electrolyte, and the total electrode area is 2.16 m². 2 The electrode spacing is 1~4cm, the voltage is 3~6V, and the current density is 300~800A / m. 2 After the reaction in the second electrolytic cell, the copper ion concentration in the solution reaches 900 ppm (the anodic reaction provides electrons, and the cathode reaction converts divalent copper ions into metallic copper, thereby rapidly reducing the copper ion content in the solution). If the pH value of the solution is <8.2 at this point, it enters the pH adjustment tank through outlet pipe II, where the pH value is adjusted to >8.2 before entering the purification tank, and then flowing back to the drawing solution tank via the purification tank. If the pH value of the solution is >8.2 at this point, it enters the purification tank through outlet pipe I, and then flows back to the drawing solution tank via the purification tank. Compared to existing draining and replenishing methods, the method of this invention does not require draining; it only requires replenishing the consumed solution with new solution.

Claims

1. A system for adjusting the concentration of copper and zinc ions in a steel cord drawing solution, characterized in that: The system includes a first electrolytic cell, a second electrolytic cell, a pH adjustment tank, and a purification tank. The drawing liquid tank feeds the drawing liquid to be adjusted into the first electrolytic cell, and the purification tank returns the adjusted drawing liquid to the drawing liquid tank. The first electrolytic cell includes a first outlet pipe, a second outlet pipe, and a third outlet pipe. The first electrolytic cell is connected to the second electrolytic cell via the first outlet pipe, to the purification tank via the second outlet pipe, and to the pH adjustment tank via the third outlet pipe. The second electrolytic cell includes an outlet pipe I and an outlet... Pipeline II connects the second electrolytic cell to the purified liquid tank via outlet pipeline I, and the second electrolytic cell is connected to the pH adjustment tank via outlet pipeline II. The pH adjustment tank is connected to the purified liquid tank via outlet pipeline III. Both the first and second electrolytic cells are equipped with online copper-zinc ion content detectors. The pH adjustment tank, the first electrolytic cell, and the second electrolytic cell are all equipped with online pH monitors. All outlet pipelines are equipped with electrically controlled valves, and the electrically controlled valves, the online copper-zinc ion content detectors, and the online pH monitors are all connected to a PLC control box.

2. The system for adjusting the concentration of copper and zinc ions in the steel cord drawing solution according to claim 1, characterized in that: A filter for filtering solid impurities in the bath is also installed on the connecting pipeline between the drawing liquid tank and the first electrolytic cell.

3. The system for adjusting the concentration of copper and zinc ions in the steel cord drawing solution according to claim 1, characterized in that: The filter uses a filter cartridge and has a filtration accuracy of no more than 20 micrometers.

4. The system for adjusting the concentration of copper and zinc ions in the steel cord drawing solution according to claim 1, characterized in that: The pH adjustment tank is connected to an external alkanolamine storage tank, and the pH of the tank solution is adjusted by pumping alkanolamine solution into the pH adjustment tank.

5. The system for adjusting the concentration of copper and zinc ions in the steel cord drawing solution according to claim 1, characterized in that: The pH adjustment tank is also equipped with a stirring device.

6. The system for adjusting the concentration of copper and zinc ions in the steel cord drawing solution according to claim 1, characterized in that: Feeding pumps are installed on the connecting pipes between the drawing liquid tank and the first electrolytic cell, as well as on the connecting pipes between the amine storage tank and the pH adjustment tank.

7. The system for adjusting the concentration of copper and zinc ions in the steel cord drawing solution according to claim 1, characterized in that: The anode of the first electrolytic cell is a zinc plate and the cathode is a copper plate; the anode of the second electrolytic cell is graphite and the cathode is a copper plate.

8. A method for adjusting the concentration of copper and zinc ions in the steel cord drawing solution bath based on the adjustment system described in claim 7, characterized in that, Specifically: In the initial stage of the drawing solution, when the zinc ion concentration in the drawing solution tank is below 200 ppm, the solution is filtered and pumped into the first electrolytic cell. In the first electrolytic cell, the solution is used as the electrolyte. After the electrolytic reaction, the solution enters the clean solution tank through the second outlet pipe, and then flows back to the drawing solution tank through the clean solution tank. The above operation is repeated until the zinc ion concentration in the solution reaches 700~800 ppm, at which point the circulation is stopped. After a period of use, the tank solution is filtered and pumped into the first electrolytic cell. In the first electrolytic cell, the tank solution is used as the electrolyte. After the reaction in the first electrolytic cell, if the copper ion concentration is still higher than 1000 ppm, the tank solution is introduced into the second electrolytic cell through the first outlet pipe. In the second electrolytic cell, the tank solution is used as the electrolyte. The anode reaction provides electrons, and the cathode reaction converts divalent copper ions into metallic copper. After the reaction in the second electrolytic cell, if the pH value of the tank solution is <8.2, it is introduced into the pH adjustment tank through outlet pipe II. After the pH value is adjusted to >8.2 in the pH adjustment tank, it enters the clean liquid tank and then flows back to the drawing liquid tank through the clean liquid tank. If the pH value of the solution is >8.2 at this time, it will enter the clean solution tank through the outlet pipe I, and then flow back to the drawing solution tank through the clean solution tank.

9. The adjustment method according to claim 8, characterized in that: During the electrolysis reaction in the first electrolytic cell, the total electrode area is 5.22 m². 2 The electrode spacing is 1~4cm, the voltage is 3~6V, and the current density is 300~600A / m. 2 .

10. The adjustment method according to claim 8, characterized in that: During the electrolysis reaction in the second electrolytic cell, the total electrode area is 2.16 m². 2 The electrode spacing is 1~4cm, the voltage is 3~6V, and the current density is 300~800A / m. 2 .

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