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UK's CleanTech nears lithium DFS at Laguna Verde

  • Spanish Market: Battery materials, Metals
  • 24/07/26

UK-listed lithium developer CleanTech Lithium has produced lithium carbonate grading up to 99.91pc purity from its Laguna Verde project in Chile, as it carries out final process checks before a definitive feasibility study (DFS).

US lithium processing firm Empower converted around 55,000 litres of eluate from CleanTech's direct lithium extraction (DLE) pilot plant in Copiapo into 330kg of lithium carbonate, CleanTech said.

The campaign follows CleanTech's first pilot-scale production of lithium-rich eluate in Chile, which was shipped to the US for conversion into lithium carbonate. It also follows the award of a 40-year lithium operating contract for Laguna Verde in Chile.

The ongoing process work is intended to confirm, not revise, the assumptions in CleanTech's pre-feasibility study, head of communications Nick Baxter told Argus. Assumed operating costs of $5,768/t, capital costs of $748mn, overall lithium recovery of 85.5pc and target commercial production of 15,000 t/yr remain unchanged at this stage.

Focus shifts to scaling up

The firm's focus is less about proving DLE can produce high-purity lithium carbonate and more about showing that the process assumptions used in the pre-feasibility study hold up ahead of the next stage of project development.

Part of the latest campaign tested how effectively impurities could be removed from Laguna Verde brine. Boron is one of the main impurities that lithium-brine projects must remove to make a battery-grade product. Boron was initially present at Laguna Verde in relatively high levels, but Empower removed around 97pc of it during processing, the firm said.

Part of the material was also processed by Chinese DLE technology firm Lanshen, whose flowsheet underpins the pre-feasibility study. Additional processing with Lanshen is under way to validate the study, and CleanTech expects to report those results shortly, Baxter said.

CleanTech is also carrying out environmental studies and engineering work while seeking a partner to help fund and develop Laguna Verde. Several firms are reviewing the project.


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