Recovery Of Waste Electroplating Solution Introduction
Plating platinum group metals (Pt, Pd, and Rh) onto other metal substrates to replace monolithic Pt group metal parts can significantly reduce material usage. Pt, Pd, and Rh plating are particularly common. Early platinum plating was primarily used in jewelry, tableware, medical devices, and scientific instruments; it is now widely used in chemical engineering, cathodic protection (platinum-titanium anodes), electronics, aerospace, and other fields. Palladium plating is mainly used for electrical contacts, jewelry, watches, and eyeglass frames. Rhodium plating is primarily used in scientific instruments, microscopes, searchlight reflectors, and electrical contact devices. These chemical and other industries generate waste plating solutions during production. These waste solutions include rinsing water, cooling water, and waste plating solution from plating components. Plating wastewater contains heavy metal ions and harmful substances such as cyanide. Waste plating solution refers to plating solution containing impurities generated during the plating process. Waste plating solution typically contains multiple metal ions, including precious metals such as palladium (Pd), platinum (Pt), and rhodium (Rh).
Applications of Platinum Group Metal (PGM) Electroplating
Recovery of Pt Pd and Rh from Spent Automotive Exhaust Catalysts Process
The treatment of spent automotive exhaust catalysts is challenging due to their variable composition and high impurity content. Current recovery methods for Pt, Pd, and Rh from these catalysts are divided into two categories: pyrometallurgical smelting and hydrometallurgical leaching, with large-scale recycling plants predominantly adopting pyrometallurgical methods.
1. Hydrometallurgical Leaching
Direct oxidative acid leaching for Pt, Pd, and Rh extraction
The use of HCl + Cl₂ to dissolve PGMs (known as “aqueous chlorination”) is a common technique in precious metal metallurgy. The spent catalyst is finely ground, and an oxidizing agent or chlorine gas is introduced into a hydrochloric acid medium under heating and stirring to dissolve the PGMs. Advantages include simple technology and scalability in acid-resistant enamel reactors. The leachate can undergo secondary enrichment via displacement or precipitation to yield a PGM concentrate, which is then separated and refined into final products.
2. Pyrometallurgical Smelting
Pyrometallurgical processes utilize molten lead, copper, iron, nickel, or sulfides (e.g., CuS, NiS, FeS) to capture PGMs through their strong affinity for these metals. A complete process for treating spent catalysts includes three stages: enrichment, separation, and refining, to achieve PGM recovery.
Pyrometallurgical enrichment technologies, such as phase reconstruction smelting, plasma smelting, copper smelting, and lead smelting, vary in terms of resource utilization efficiency and technical performance.
Process
— Pretreatment: Mechanical shredding and magnetic separation of metals from non-metals.
— Leaching: Dissolving precious metals with solvents (e.g., nitric acid for silver).
Separation and Purification
— Chemical Precipitation: Adding reducing agents (e.g., sodium sulfite) to precipitate metals.
— Solvent Extraction: Selectively isolating metal ions with extractants.
Main Equipment
— Reactor: Acid/alkali-resistant containers (e.g., FRP reaction tanks).
— Filtration Equipment: Filter press, centrifuge.
— Extraction Equipment: Centrifugal extractors, mixer-settlers.
3. Mechanical-Physical Separation
Working Principle
Separates precious metal particles based on physical properties (density, magnetism, conductivity).
Process
— Crushing: Shredding e-waste into fine particles.
— Eddy Current Separation: Isolates non-ferrous metals (e.g., copper, aluminum).
— Electrostatic Separation: Leverages conductivity differences to sort precious metals.
— Gravity Separation: Uses density differences (e.g., shaking tables, centrifuges).
Main Equipment
— Eddy Current Separator: Separates non-ferrous metals.
— High-Voltage Electrostatic Separator: Sorts micron-level metal particles.
— Centrifugal Shaking Table: Density-based sorting.
4. Electrolysis
Working Principle
Electrochemically deposits precious metals from ionic solutions (commonly used in refining).
Process
— Pretreatment: Dissolving precious metals into ionic solutions (e.g., cyanide gold solution).
— Electrolysis: Applying electric current in an electrolytic cell to deposit metals onto the cathode.
Main Equipment
— Electrolytic Cell: Corrosion-resistant materials (e.g., titanium or graphite electrodes).
— DC Power Supply: Provides stable current.
If you are planning to start a business recycling precious metals from e-waste, we, as a professional precious metal recycling equipment supplier, can provide you with customized solutions.
Technical Parameter
If you have other requrement and want to know more details, please contact us.(The data in this table are for reference only)
| Capacity | Recommended Solution |
| 0.05-100ton/day | Pyrometallurgy |
| 0.1-1000ton/day | Hydrometallurgy |
| 0.1-1000ton/day | Electrolysis |
| 0.1-5ton/day | Mechanical-Physical Separation |
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- Recovery of gold and silver from anode slime
- Recovery of precious metals from e-waste
- Recovery of platinum palladium and rhodium from spent automotive exhaust catalysts
- Recovery of waste electroplating solution
- Recovery of platinum from fuel cell catalysts
- Regeneration and recovery of platinum and silver from waste slag
- Extraction of precious metals from lead-zinc ores
- Recovery of platinum from hydrogen peroxide production anode slime
- Recovery of silver from solar panel silicon wafers
- Recovery of platinum and palladium from various types of spent catalysts and other waste residues
- Recovery of platinum and rhodium from waste refractory bricks and glass slag in the glass fiber industry
- Recycling of platinum- and silver-containing waste residues
- Recovery of ruthenium from various ruthenium-containing wastes
- Recycling of platinum group metal alloy wastes
- Recovery of palladium from spent catalysts in the coal chemical industry
