BARC Extracts Lithium From Seawater
Why in News?
- On 20 October 2026, Down To Earth reported that scientists at the Bhabha Atomic Research Centre (BARC) have developed a new way to extract lithium from seawater.
- The method recovered nearly 90 per cent of the lithium dissolved in natural seawater, according to a study in the journal Talanta.
- The work was done at BARC's National Centre for Compositional Characterization of Materials in Hyderabad.
- India relies entirely on imports for raw lithium and battery-grade lithium-ion cells, which matters for its electric vehicle and energy-storage plans.
Key Terminologies
- Solvent Extraction
- A method that uses a liquid solvent to pull a chosen substance out of water. In the BARC study, dibenzoyl methane dissolved in methyl isobutyl ketone captured the lithium.
- Stripping
- The step that moves the captured metal from the solvent into a separate solution. BARC used dilute nitric acid, which leaves the solvent free to be used again.
- Magnesium-to-Lithium Ratio
- A measure of how much magnesium accompanies lithium in a source. In seawater it exceeds 6,000, which makes selective lithium extraction difficult.
- Critical Minerals
- Minerals that are vital for the economy and hard to secure, such as lithium used in batteries. The Ministry of Mines runs a mission to build supply chains for them.
Key Issues
- Dilute Source: Seawater holds an estimated 230 billion tonnes of lithium, but at only about 0.17 mg per litre, so a method has to separate a very small amount from a huge volume.
- Selectivity Problem: The magnesium-to-lithium ratio above 6,000 makes extraction hard. BARC raised the pH with sodium hydroxide and sodium carbonate, which removed over 99 per cent of interfering elements such as magnesium and calcium.
- Reusable Solvent: Lithium was pulled out with dibenzoyl methane in methyl isobutyl ketone and stripped with dilute nitric acid. Recovery stayed near 90 per cent over five cycles, with solvent loss of about 10 per cent per cycle.
- Import Dependence: India imports all of its raw lithium and battery-grade lithium-ion cells, a vulnerability for electric vehicles and storage, as the report notes.
- Unproven at Scale: The authors say long-term performance, energy use, chemical costs, marine ecosystem effects and industrial feasibility remain to be assessed, and prolonged mixing may cause persistent foam.
Key Implications
Positive/Pros/Merits
- New Domestic Source: Seawater could add a source of lithium for India, which has a long coastline, if the method scales, which is an inference.
- High Recovery: Nearly 90 per cent recovery from natural seawater shows that the chemistry works on real samples and not only on lab solutions.
- Lower Chemical Use: The solvent also stabilises the lithium complexes, so fewer separate additives are needed.
- Research Capacity: The work by a government laboratory adds to the technology base for the Ministry of Mines' critical minerals efforts.
Negative/Cons/Demerits
- Early Stage: The result is a laboratory study, and the authors list major questions on cost, energy and scale-up, so it is not a ready supply source.
- Solvent Loss: Physical solvent losses of about 10 per cent per cycle need replenishing, which adds cost.
- Marine Risk: Effects on marine ecosystems have not been assessed, so large-scale use cannot yet be judged.
- Competition from Other Sources: Seawater lithium is far more dilute than mined sources, so cost will decide its role, which is an analytical point.
Key Initiatives
- National Critical Mineral Mission: Approved by the Union Cabinet on 29 January 2025 with Rs 16,300 crore of government expenditure and Rs 18,000 crore of expected PSU and other investment, run by the Ministry of Mines.
- Full Value Chain: The mission covers exploration, mining, beneficiation, processing and recovery from end-of-life products, with a domestic stockpile, processing parks and a proposed Centre of Excellence.
- Overseas Assets: Khanij Bidesh India Limited (KABIL), a joint venture of the Ministry of Mines, acquired about 15,703 hectares in Argentina's Catamarca province for lithium exploration and mining.
- Geological Survey of India: It undertook 368 exploration projects over three years, with 195 under way in 2024-25, and planned 227 for 2025-26.
The Ministry of Mines says the National Critical Mineral Mission builds the whole chain from exploration to recycling and overseas assets. The Geological Survey of India and KABIL are the main executing bodies named in the reports. The BARC seawater method is a research result and the reports reviewed describe no government programme to scale it.
Director's Perspective
Way Forward
- Test the BARC method on larger seawater volumes at a coastal pilot plant, and report energy use and chemical cost per tonne of lithium.
- Study marine effects and brine disposal before any scale-up, so that the process does not trade one import problem for an ecological one.
- Fund solvent recycling research to cut the roughly 10 per cent loss per cycle, which is the main cost lever the study points to.
- Link the pilot to the National Critical Mineral Mission's processing parks, so that recovered lithium has a route to battery-grade material.
The BARC result is a promising scientific step but not yet a supply solution. Nearly 90 per cent recovery from natural seawater, a reusable solvent and a clear need given import dependence are strong points, while cost, energy, scale and marine effects are unanswered. In a Mains answer, credit indigenous research aimed at a strategic mineral, then conclude that pilot-scale proof and environmental safeguards will decide whether seawater lithium becomes real.
GS Relevance
Frequently Asked Questions
How have Indian scientists extracted lithium from seawater?
Scientists at the Bhabha Atomic Research Centre in Hyderabad raised seawater's pH to remove interfering elements, then used dibenzoyl methane in methyl isobutyl ketone to capture lithium. Dilute nitric acid stripped it out, giving nearly 90 per cent recovery, as reported on 20 October 2026.
Why is lithium from seawater important for India?
India imports all of its raw lithium and battery-grade lithium-ion cells, so a domestic source would reduce a key vulnerability for electric vehicles and energy storage. Seawater holds an estimated 230 billion tonnes of lithium, though at only about 0.17 mg per litre.
What is the National Critical Mineral Mission?
The National Critical Mineral Mission was approved by the Union Cabinet on 29 January 2025 and is run by the Ministry of Mines. It has Rs 16,300 crore of government expenditure and covers exploration, processing, recycling, a stockpile and overseas assets.
PYQ Practice — Statement Analysis
1 The BARC seawater method recovered nearly 90 per cent of dissolved lithium.
Recovery stayed near 90 per cent over five extraction cycles.
2 India produces enough raw lithium to meet all its domestic demand.
India relies entirely on imports for raw lithium and battery-grade lithium-ion cells.
3 Khanij Bidesh India Limited acquired lithium-related land in Argentina's Catamarca province.
It acquired about 15,703 hectares for lithium exploration and mining.