The use of titanium anodes is a common choice in the process of copper recovery in etching fluids.Titanium anode is widely used in PCB (printed circuit board) manufacturing and waste etching fluid treatment and other fields, through the electrolysis method of efficient recovery of copper, which not only saves resources, but also reduces environmental pollution.
Products Description
1. Application:
PCB industry production process produces a large number of micro-etching liquid, etching liquid, copper nitrate and other containing different concentrations of copper.
2. Application system:
| System Category | Coating Type |
| Micro etching fluid | Titanium-Iridium-Tantalum |
| Alkaline etching fluid | Titanium-Iridium-Tantalum |
| Acid etching fluid | Titanium-Ruthenium-Iridium |
3. Current density: (200-400) A/m2
4. Service life: 12-24 months
5. Process Flow:
A. Microetching liquid (Cu2SO4+H2O2) oxygen lysis cell (decomposition H2O2) electrodeposition copper
B. Alkaline etching liquid extraction process copper sulfate + sulfuric acid electrodeposition copper
C. Acid etching liquid ion film electrolysis (electrodeposition copper) tail gas treatment (absorption of chlorine)
6. Electrochemical performance and life test (reference HG/T2471-2007 Q/CLTN-2012)
| Name | Enhanced weight loss mg | Polarizability mv | Oxygen evolution/chlorine potential V | Test condition |
|
Iridium-Tantalum Coated Titanium Anode |
≤1 | <40 | <1.45 | 1mol/L H2SO4 |
|
Ruthenium-Iridium Coated Titanium Anode |
≤10 | <40 | <1.13 | 1mol/L H2SO4 |
7. Product background and introduction:
PCB industry production process produces a large number of micro-etching liquid, etching liquid, copper nitrate and other metals containing different concentrations of copper and other metals, high recovery value, and the effluent will also have a small amount of copper heavy metals exist, such as not reasonable environmental protection treatment, on the one hand caused a serious waste of resources, on the other hand heavy metals after discharge into the soil and water sources. It will cause serious pollution and harm to the natural environment on which we live and our own health.
1) Microetching solution Microetching solution including sodium persulfate/sulfuric acid system and hydrogen peroxide/sulfuric acid system, in recent years, widely used in PCB surface treatment process, such as: copper deposition (PTH) process, plating process, inner layer pretreatment, green oil pretreatment, OSP treatment and other production lines, direct electrolysis on the anode coating damage.
2) Etching solution During the etching process of electronic circuit plate (PCB), the copper content in the etching solution gradually increases. For optimal etching results, the etching solution should contain 120 to 180 grams of copper per litre and the corresponding amount of etching salt (NH4CI) and ammonia (NH3). Etching fluid recycling system has acid and alkaline, the two systems can be divided into extraction method and direct electrolysis method. A large amount of post-use etching fluid that originally needed to be discharged can be reduced and regenerated into regenerated etching fluid that can be used again. Thus, the discharge of production waste liquid is reduced, the reuse reduces the production cost, and the high-purity electrolytic metal copper can be extracted.
Patent Certificate
Application of titanium anode in copper recovery from etching solution
In the process of etching, a large number of copper ions are dissolved in the etching solution. Recycling these copper not only helps to reduce environmental pollution, but also can achieve economic benefits through recycling copper resources. The specific process of electrolytic copper recovery using titanium anodes usually includes the following steps:
- Preparation of an electrolytic cell: an etching solution containing copper ions is placed in an electrolytic cell with a titanium anode and cathode (usually a copper plate or other suitable material).
- Electrolytic process: After the power is turned on, copper ions are reduced and deposited on the cathode into metallic copper, while the titanium anode remains stable and is not corroded.
- Copper collection: After a certain period of electrolysis, copper ions are gradually deposited on the cathode, and the cathode can be removed regularly and the deposited metal copper can be scraped.
- Etching solution treatment: The etching solution after electrolytic recovery of copper can continue to be used or further treated to remove impurities and be recycled.
some application cases of titanium anodes for copper recovery by etching fluid
1. Application in PCB manufacturing industry
In the manufacturing process of printed circuit boards (PCBS), copper is used extensively as a conductive material. A large amount of waste liquid containing copper is produced in the etching process. The following is a typical application case:
Case description:
Company: A large PCB manufacturer.
Background: The company produces large amounts of copper-containing etching fluids every day and requires efficient copper recovery to reduce production costs and environmental pollution.
Solution: Copper recovery by titanium anode electrolysis method.
Process: The copper-containing etching liquid is introduced into the electrolytic cell, the titanium anode is used as the positive electrode, and the stainless steel cathode is used as the negative electrode. After electricity is applied, copper ions are deposited on the cathode as metallic copper.
Result: With this method, the company managed to recover about 90 percent of the copper, which can be reused. At the same time, the etching liquid can be recycled after treatment, which greatly reduces the waste liquid discharge.
2. Application of waste etching liquid treatment plant
The waste etching fluid processing plant is specialized in processing the waste etching fluid generated by the electronics manufacturing industry and recovering the copper resources in it.
Case description:
Company: a waste etching liquid treatment company.
Background: The company processes a large amount of waste etching fluid from various electronics manufacturing plants every day, with the goal of efficiently recovering copper and ensuring that the treated liquid meets environmental emission standards.
Solution: Recycle copper by titanium anode electrolysis.
Process: After pretreatment, the waste etching liquid enters the electrolytic cell, and the titanium anode and cathode system are arranged according to the design requirements. In the electrolytic process, the current density and temperature are controlled to achieve efficient copper ion deposition.
Results: Through titanium anode electrolysis, the company recovered 98% of the copper in the waste liquid and made the treated liquid comply with environmental discharge standards. The recycling of copper not only brings economic benefits, but also reduces environmental pollution.
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