Waste battery treatment options: comparing their environmental performance

Area of Science:

• Environmental Science
• Materials Science
• Chemical Engineering

Background:

• Consumer batteries require effective recycling strategies.
• Existing recycling routes include hydrometallurgical and pyrometallurgical processes.
• The Batteries Directive mandates a 50% recycling rate.

Purpose of the Study:

• To compare the environmental performance and recycling rates of different waste consumer battery treatment scenarios.
• To evaluate the feasibility of achieving the 50% recycling target based on metal recovery.

Main Methods:

• Life Cycle Analysis (LCA) for environmental impact assessment.
• Mass balance calculations to determine recycling rates.
• Comparison of two hydrometallurgical and two pyrometallurgical treatment scenarios.

Main Results:

• No single treatment scenario is universally superior; each has distinct advantages and disadvantages.
• Hydrometallurgical routes primarily focus on zinc and iron, with increased energy demand if manganese is included.
• Pyrometallurgical routes can recycle zinc, iron, and manganese.
• Achieving the 50% recycling target solely through metal recovery is challenging.

Conclusions:

• The choice of battery recycling technology significantly impacts environmental performance and metal recovery.
• Tailored approaches are necessary as there isn't a 'typical' hydrometallurgical or pyrometallurgical process.
• Current metal recycling alone may not suffice to meet the EU's 50% battery recycling directive target.