Vacuum Harrow(Rake) Dryers Emerge as the “Safety Lock” for Lithium-Ion Battery Recycling

Vacuum Harrow(Rake) Dryers Emerge as the “Safety Lock” for Lithium-Ion Battery Recycling; Efficient Electrolyte Recovery Becomes the Industry’s New Favorite

With the surging number of end-of-life lithium-ion batteries, how to safely and efficiently handle the hazardous substances they contain has become a focal point for the industry. Recently, vacuum Harrow(Rake) drying technology has quietly gained popularity within the recycling sector and is regarded as the key equipment for addressing the safety issues associated with “black powder.”

During the crushing and recycling of lithium-ion batteries, the resulting “black powder” contains residual electrolyte solvents that are flammable and explosive. If not handled properly, this poses significant safety risks and leads to resource waste. Traditional processing methods often struggle to completely separate these substances at low temperatures. In contrast, vacuum Harrow(Rake) dryers create a negative-pressure environment within a sealed system and, combined with the unique stirring design of the paddles, can rapidly evaporate and recover the electrolyte at relatively low temperatures.

It is reported that this equipment not only addresses safety concerns but also delivers an “unexpected bonus.” Data from a certain equipment supplier indicates that its highly efficient condensation recovery system achieves an electrolyte recovery rate exceeding 96%. This means that recycling plants can earn additional revenue from selling the recovered solvents while extracting metals such as nickel, cobalt, and lithium. Currently, several international technology groups, including ANDRITZ, are continuously optimizing this technology, with some models achieving solvent extraction rates as high as 99.5% for complex materials.

Industry experts note that as environmental regulations tighten, this “dry process”—which combines environmental and economic benefits—is becoming the standard configuration for lithium-ion battery recycling lines.

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