In the field of precious metal extraction, while the traditional cyanide method is widely employed, it faces significant bottlenecks—specifically, low leaching rates for refractory ores (such as those containing carbon or arsenic) and the inherent toxicity risks associated with cyanide. Chlorination volatilization technology, an innovative pyrometallurgical process, is emerging as a compelling alternative due to its unique advantages, proving particularly effective for the high-efficiency recovery of precious metals from complex resources.

Core Technical Advantages

The most prominent feature of this technology is its exceptional adaptability. For gold ores containing carbon or arsenic—which pose significant challenges to conventional cyanide methods—as well as for complex metallurgical intermediate materials, chlorination volatilization enables the effective separation of precious metals without the need for fine grinding prior to leaching, thereby significantly streamlining the overall process. Its recovery performance is outstanding; volatilization recovery rates for gold, platinum, and palladium can exceed 95%, making it particularly well-suited for the enrichment and extraction of Platinum Group Metals (PGMs).

From an environmental perspective, the technology is entirely cyanide-free throughout the process, thereby eliminating the risks associated with highly toxic chemicals at the source and ensuring compliance with increasingly stringent environmental regulations. Furthermore, the technology boasts a high enrichment ratio; a single-step operation can concentrate precious metals—initially present at levels of just a few grams per ton—to concentrations reaching tens of percent, thereby drastically reducing the volume of material requiring subsequent processing. Additionally, the technology facilitates the synergistic recovery of multiple metals, allowing gold, platinum, palladium, copper, zinc, and other elements to simultaneously volatilize into the flue gas, where they can be subsequently separated to achieve comprehensive resource utilization.

Key Application Scenarios

In the extraction of gold from refractory ores, this technology effectively resolves issues such as low cyanide leaching rates and gold losses due to adsorption by carbonaceous matter—problems commonly encountered with Carlin-type and carbon- or arsenic-bearing gold deposits. In the field of electronic waste processing, it enables the highly efficient recovery of gold and palladium from discarded circuit boards and microchips, effectively separating these precious metals from their plastic and ceramic substrates. Regarding metallurgical intermediate materials, the technology can process anode slimes, flue dusts, and slags generated during copper and lead smelting operations, extracting associated precious metals and thereby opening up new avenues for resource recycling.

With its characteristics of being green, highly efficient, and broadly applicable, chlorination volatilization technology is rapidly becoming a pivotal direction for future development within the field of precious metal extraction.