Chilean national mining company Enami's tests on direct lithium extraction (DLE) technology have shown reduced water consumption, improved lithium recoveries and a smaller surface-area footprint, the company said.
Eight international laboratories participated in the tests on brine samples from Enami's Altoandinos project, Chile's largest undeveloped lithium deposit.
On average, water consumption was 36m³/metric tonne (t) of lithium carbonate equivalent (LCE), 55 times less than traditional lithium extraction methods from evaporation ponds, according to Enami.
Lithium recoveries from brine also doubled from 42pc in ponds to an average of 92pc, while a 75,000 t/yr DLE plant would require a surface area of 10 hectares (25 acres) versus 1,020 hectares (2,520 acres) for traditional methods, it said.
Traditional extraction involves pumping lithium-rich brines from salt lakes into ponds to evaporate under northern Chile's fierce sun, thereby increasing lithium concentrations.
Enami plans to develop Altoandinos in northern Chile's Atacama region in partnership with Anglo-Australian miner Rio Tinto for an estimated $3bn. The proposed joint venture is still subject to regulatory and other approvals.
The state-run company has identified resources of 15mn t of LCE at Altoandinos, which is comprised of the Aguilar, La Isla and Grande salt lakes. It has also reached agreement with six nearby indigenous communities to develop the project.
Chile's national lithium strategy, launched in April 2023, aims to increase production of the white metal while reducing the environmental impacts on salt lakes' fragile ecosystems.
The strategy commits Chile to transitioning from traditional extraction methods to DLE and protecting at least 30pc of salt lake ecosystems.
Chile has the world's largest lithium reserves and is the second-largest lithium producer after Australia, with output of an estimated 261,000 t of LCE in 2024, according to the US Geological Survey.