Akshat RathiLondon — Breakthrough Energy Ventures, headed by Bill Gates, and MIT’s The Engine fund are leading an investment round of $20m for Lilac Solutions, a US start-up aimed at making the extraction of lithium less water-intensive and more sustainable.
About 75% of the world’s lithium is trapped in underground deposits of briny water that contain a mixture of salts. The typical way to recover lithium is to pump the water to the surface into miles-long salt ponds and let the water evaporate. What remains is then treated with chemicals, processed, washed, and filtered to leave behind the lithium.
The process does away with the need for large evaporation ponds and is able to return the lithium-depleted brine back underground, according to the company. It also cuts down the amount of time needed to extract lithium from brine to mere hours. And the beads are selective enough to recover about 90% of lithium in brines.
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