Product Data Sheet of Environmental-Friendly Cyanide-Free Gold Stripping Solution
I. Product Overview
The environmental-friendly cyanide-free gold stripping solution is a new generation of special reagent for precious metal stripping without cyanide and high toxicity. It is specially designed for the removal and recovery of gold layers on gold-plated workpieces such as PCBs, connectors, terminals, IC frames and electronic waste. It replaces the traditional cyanide process, featuring safety, environmental protection, fast stripping and no damage to the substrate, meeting the needs of electroplating rework and precious metal resource recovery.
II. Core Features
Safety and Environmental Protection
It does not contain controlled toxic substances such as cyanide, hexavalent chromium and heavy metals, has no pungent odor and no toxic gas emission, complying with RoHS and environmental emission requirements.
Excellent Selectivity
It can quickly strip pure gold/hard gold/soft gold plating, without corroding substrates such as copper, nickel, silver, iron and ABS, ensuring the workpiece remains free from deformation and discoloration.
High Efficiency and Speed
The gold stripping rate is 0.5–2μm/min, and it can work at room temperature to medium temperature, with high rework and recovery efficiency.
High Gold Loading Capacity
The gold loading capacity of per liter of working solution can reach 5–15g, with long service life and low comprehensive cost.
Easy Gold Recovery
The gold ions in the gold stripping solution are stable, and the gold recovery rate can reach ≥98% with the matching gold precipitant, featuring simple recovery process.
III. Technical Parameters
- Appearance: Pale yellow to brown transparent liquid
- Specific Gravity: 1.15–1.25 g/cm³
- pH Value: 3–7 (depending on model)
- Working Temperature: Room temperature – 60℃ (recommended 40–55℃)
- Corrosion to Copper: ＜0.1μm/hr
- Corrosion to Nickel: ＜0.05μm/hr
- Effective Gold Loading Capacity: 5–15g/L
- Packaging: 25L/barrel, 200L/barrel
IV. Application Scope
- Rework and gold stripping of defective gold-plated workpieces
- Gold stripping of PCB gold fingers, connectors and terminals
- Gold layer stripping of IC frames and semiconductor components
- Precious metal recovery from electronic waste and gold-plated jewelry
- Gold tank cleaning and gold plating equipment maintenance
V. Usage Process
- Use the original solution for tank opening without dilution; stirring can improve the speed.
- After degreasing and cleaning the workpiece, immerse it in the working solution, with 40–55℃ as the optimal temperature.
- Take out the workpiece after the gold layer is completely stripped, rinse it thoroughly with clean water, and blow dry or bake dry.
- Add new solution when the efficiency of the solution decreases; centrally recover and extract gold when the gold loading upper limit is reached.
VI. Gold Recovery Method
- Filter the gold stripping waste liquid to remove impurities.
- Add the special gold precipitant in proportion, stir and let it stand.
- Filter to obtain gold sludge, and obtain pure gold through roasting and smelting.
- The treated waste liquid can be neutralized and discharged or recycled.
VII. Safety, Storage and Transportation
- Wear acid-resistant gloves and goggles during operation, and keep ventilation.
- Avoid contact with skin and eyes; rinse immediately with clean water if contact occurs accidentally.
- Store in a cool, dry and sealed place, away from strong acids, food and children.
- Transport as general chemicals; it is not a dangerous chemical.
VIII. Summary of Product Advantages
- Say goodbye to the high-risk control of cyanide, safe and compliant
- Fast stripping, no damage to the substrate, high qualified rate
- High gold loading capacity, simple recovery, lower cost
- Environmentally friendly with no emission pressure, suitable for factory environmental assessment
