A recycling plant never receives a battery in the condition its maker intended. Packs arrive crushed, swollen, wet, or with a state of charge nobody recorded. That single fact moves the protective equipment decision upstream, away from the furnace and the leach tank, to the door where the container is opened.
Intake Is the Hazardous Area
A punctured cell can sit quietly for hours before it enters thermal runaway, so the receiving bay and the quarantine area are the places where an incident actually starts. In late October, a fire broke out in a storage area of recovered material at a scrap recovery plant in the Gello industrial district of Pontedera, in Tuscany, producing a smoke column visible across the lower Valdarno. Fire teams brought it under control the following day, no casualties were reported, and local reporting described a lithium battery as the suspected ignition source while the investigation remained open.
For a plant manager the sequence matters more than the cause. By the time smoke is visible the exposure has already changed from electrolyte chemistry to combustion products, and the crew at the door is dressed for the wrong event. Intake staff need hand and forearm protection that tolerates both, plus a rule that a damaged pack is quarantined in a container rather than sorted on the floor.
The Salt Outlasts the Solvent
The electrolyte salt in common lithium cells hydrolyses when it meets moisture, releasing hydrogen fluoride. That moisture does not have to come from a spill. Sweat inside a glove is enough, which is why salt residue trapped in a cuff or a boot lining keeps generating acid after the visible spill has been wiped away.
The solvents are the easier half. Carbonate electrolytes are esters, and thin disposable nitrile - the default choice at most receiving desks - swells and passes them within minutes. Butyl and laminated film last longer and cost dexterity. The question for a supplier is a permeation table for the actual electrolyte at the temperature of the task, not a generic chemical-resistant claim.
Black Mass Travels
Black mass is fine, adhesive and loaded with nickel, cobalt and manganese compounds. It does not stay where it falls: boot treads carry it to the changing room, cuffs carry it to the forearm, and a glove pulled off by the fingers hands it to the next person. Dry powder also destroys grip, which is how cells get dropped.
The answers are unglamorous. Change gloves at the boundary rather than at the end of the shift. Keep one pair of boots inside the process area and wash or cover them at the door. Give the clean side its own flooring. Add cut resistance, because cell cans and module frames are sharp, and a thin glove sends more hands to the first-aid box than any chemical does.
Acid and Caustic in the Same Building
Hydrometallurgical lines leach with sulfuric acid and hydrogen peroxide, then neutralise with sodium hydroxide; thermal lines run furnaces and slag handling. A worker can cross from an acid mist zone to a caustic wash bay in twenty steps, which means a glove chosen for one side is wrong on the other, and a boot that survives the drip may not survive the spray down the shaft. Look for a shaft above the splash line, a compound covering the full range from strong acid to strong alkali, and a sole that sheds slurry instead of holding it.
Buyers get more from asking which pair is issued at which door, and how often it is replaced, than from any single resistance rating.