Researchers at American enterprise Battelle have developed a biotechnology-based rare earth element separation process capable of isolating lanthanum and neodymium in a single step with over 90% purity and yield, circumventing traditional multi-stage toxic acid refining methods highlighted in a study published in Chemical Science.
Battelle Researchers Unveil Single-Step Rare Earth Extraction
The Environmental Cost of Conventional Supply Chains
Rare earth elements comprise a group of 17 metals critical for our daily lives. Despite their name, these elements are not rare within the Earth’s crust. However, they are very dispersed and mixed with other minerals, often radioactive.
Mining operations yield raw ore mixtures containing multiple elements. Isolating each material requires a very selective treatment. According to specialized outlet Interesting Engineering, separating rare earth elements represents one of the most complex steps in the mining supply chain.
Traditional extraction and refining procedures carry a catastrophic environmental and human cost. Conventional separation relies on highly toxic acid baths to separate the metals. This process also causes the contamination of soils and water tables by toxic residues.
Targeted Peptides Replace Toxic Acids
To secure the supply of these materials essential to modern economies amid accelerating demand, the scientific team at Battelle engineered calcium-binding peptides (a small molecule) designed to interact selectively with specific rare earths. This biological mechanism allows for a very targeted separation approach capable of distinguishing between chemically similar materials without requiring traditional multi-stage treatments or chelators.
During experimental testing on simulated leachates and industrial feedstocks, the peptide-based technique successfully isolated lanthanum and neodymium in a single step, without a chelator. The method achieved purity and yield superior to 90% while simultaneously eliminating ions other than rare earths from the mixture.
Kate H. Kucharzyk, research leader in the operational biotechnology division at Battelle, emphasized the implications of these findings to Businesswire. The research demonstrates how modified proteins can recognize and separate rare earth elements with remarkable precision. Harnessing biological mechanisms gives us the possibility to create more efficient and potentially more sustainable approaches to recover these vital resources.
