Overview
Lithium is the anchor product of every brine project, and the reason the brine is at surface in the first place. It is also the cheapest thing dissolved in it. At Salton Sea a cubic metre of geothermal brine carries about 202 mg/l of lithium — more by mass than anything else of value — worth roughly $12, against roughly $180 in rubidium and roughly $60 in cesium in the same water.
The industry sees only lithium, and the technology it uses to see it is the problem. Direct lithium extraction targets a single ion, needs membranes, reagents and high-pressure reinjection, rejects 60–70 % of the flow as depleted brine, and carries the full cost burden on one product.
ARBOK takes the whole stream in one pass: near-complete clean water recovery with essentially no liquid tail, table salt as a commodity, lithium, and the rubidium and cesium that DLE returns underground. Water and salt alone pay for the unit; lithium remains the volume product, and the rest arrives at practically zero marginal cost. Deep underground waters treated today as a salinity problem are, in fact, liquid deposits.
> Core technology and architecture: see ARBOK-VC (Vacuum Cracking). Companion metals from the same stream: ARBOK-Rubidium and ARBOK-Cesium.
Applications
Energy storage. Electric-vehicle batteries, grid-scale storage, and backup power for AI data centres — the demand set that made lithium the oil of the 21st century. The more AI and renewable generation, the more lithium is required.
Feedstocks. Lithium brines; geothermal water of Salton Sea type — the "Lithium Valley" of California, where lithium runs in one stream with rubidium, cesium, manganese and zinc; oilfield brines of the Smackover Formation in Arkansas and East Texas, already developed for lithium and bromine; lepidolite tailings; produced waters that already reach surface in industrial volumes.
Co-products from the same pass. Clean technical water, table salt as a commodity, rubidium and cesium.
Scale: container-class units co-sited with existing brine, geothermal and oilfield operations — either replacing the DLE stage or working the stream ahead of and around it.
Operating Principle
Under deep vacuum the brine evaporates without heat being supplied — process temperature equals the temperature of the incoming stream, that is, of the feed and its surroundings; there is no separate heating circuit and no temperature setpoint anywhere in the process. Vapour condenses as clean water; all dissolved species remain as a low-moisture dry residue, which is then separated by density. Lithium, rubidium, cesium and sodium differ noticeably in density, so the dry salt stream divides into separate fractions.
The incumbent route does the opposite. DLE, sorption and high-pressure osmosis drive the water through a multi-stage chain of reagents, membranes, chemicals, coagulants, inhibitors and filters for the sake of one target ion, then push a large volume of depleted brine back underground under pressure — a second cost on top of the first. Equipment corrodes, membranes are replaced often, and 60–70 % of the flow leaves as a liability.
Bringing each salt to commercial purity is a second, chemical stage of compact refining. It is optional in the sense that a site may simply sell the separated salts from brines now read as raw material rather than waste; where the metal is the product, the refining stage is container-scale and can sit in any jurisdiction.
Key Parameters
| Parameter | Value |
|—|—|
| Operating pressure | deep vacuum, well below atmospheric |
| Process temperature | equal to the temperature of the incoming stream; no heat supplied, no separate temperature setpoint anywhere in the process |
| Specific electric energy | very low specific energy consumption — the only cost item, and among the lowest reported for the sector; renewable-compatible |
| Water recovery | near-complete water recovery, essentially no liquid tail |
| Dissolved-substance extraction | high recovery across the dissolved species in the stream |
| Salt residue moisture | low-moisture dry cake |
| Throughput per module | a modular containerized unit; capacity scales by adding units |
| Unit lifespan | 15–20 years — no corrosion, since there is no oxygen in vacuum |
| Consumables | none — no membranes, reagents, coagulants, inhibitors or filters |
| Lithium, Salton Sea geothermal brine | 202 mg/l (~200 mg/l, 0.02 % in the article sources) |
| Brine salinity, reference case | ~100 g/l |
| Lithium in stream, 1,000 m³/h (~8.8 million m³/year) | ~9,000–10,000 t Li₂CO₃/year at Salton Sea concentration; ~8,000 t Li₂CO₃/year in the post basket |
| Lithium in stream, 25 l/s (~405,000 m³/season) | ~82 t lithium (≈435 t LCE) per season at 202 mg/l, per ARBOK-GEYSER; a conservative recovery assumption applied to the selective stage |
| Notional value per m³ of Salton Sea brine | ~$12 in lithium — against ~$180 in rubidium and ~$60 in cesium |
| Lithium carbonate price | $10,000–15,000/t (≈$12/kg) after the collapse from peak; $10,000–20,000/t lower band, July 2026, per ARBOK-GEYSER |
| Table salt price | ~$40/t EXW; $60/t in the post basket |
| Clean water price, scarce California supply | ~$1.2/m³ |
Architecture and Components
Containerized vacuum separation module tied into the brine line: deep-vacuum evaporation stage; vapour condensation to near-complete technical water recovery; low-moisture dry residue collection; density separation into lithium, rubidium, cesium and sodium fractions; clean-water return path.
Compact second-stage chemical refining brings the lithium fraction to commercial purity — container-executable, deployable in any state.
Modular and scalable; capacity increases by adding units, combined into cascades as capacity requires. CAPEX is comparable to DLE for the same duty.
Advantages
Technical. Whole-stream processing rather than single-ion targeting; one pass fully purifies the water and separates every dissolved salt; no membranes to foul or replace; no corrosion, because the process runs in vacuum; 15–20 year service life.
Economic. Specific energy consumption is the only cost line and among the lowest reported extraction energy figures for the sector, so the unit can run on renewable power. Revenue is multi-stream — water and salt together are on the order of $45 million a year on a 1,000 m³/h stream and pay off the unit before any lithium is counted, which is exactly what DLE cannot do while selling one product and bearing the full cost set. OPEX is orders of magnitude lower at comparable CAPEX.
Environmental. Zero waste discharge; no depleted brine returned to the formation; the salt-discharge problem is removed rather than relocated, along with the salts, arsenic and heavy metals these brines otherwise carry; residual solids are ordinary debris.
Strategic. The US pumps its own brine yet sends the lithium to be refined where about 65–70 % of world lithium processing sits. Compact local refining closes that gap on the same site as the extraction.
Integrations
ARBOK-VC (Vacuum Cracking) · ARBOK-GEYSER · ARBOK-CRYSTALLIZER · ARBOK-Rubidium · ARBOK-Cesium · ARBOK-CHLORIDE · Arbok-BioLi · ARBOK-SODA · ARBOK LIGHT-SALT · LiGra-BATTERY(Lithium-Graphene)
Co-locates with lithium-brine, oilfield-brine and geothermal operations and cascades on the platform with other metal-recovery stages. On geothermal projects the lithium fraction rides on the heat business of ARBOK-GEYSER, where the operator keeps wells, heat offtake and energy revenue while ARBOK processes the stream and takes the mineral basket.
Deployment & Operation
Steps: brine assay for lithium and companion species → recovery configuration → install on the brine or geothermal stream → commissioning → handover. Container-class, automated, minimal operator involvement; installation typically 2–6 weeks depending on scale. Serviceable by standard oilfield crews on produced-water and geothermal sites.
Commercial models. 15–20 year off-take paid per operation; franchise for brine operators with 5–7 year payback; global service network. Leasing and BOOM structures require no capital investment from the operator. Produced-water sites give the shortest market entry — the wells exist, the water is already at surface, and the infrastructure is amortized.
TRL
TRL 9 confirmed for the integrated Li/Rb/Cs recovery case, built on the industrially validated recovery platform, with selective recovery defined across the brine, geothermal, lepidolite-tailings and pollucite routes. The post sources rate the deployed brine module at TRL 8.
Remaining steps: field reference site on a lithium brine; validation of the selective-stage recovery assumption on the specific feed; offtake and grade qualification for battery-grade product.
Market Potential
Demand. Lithium demand grows exponentially with electric vehicles, grid storage and AI data-centre backup power. Prices have fallen from their peak to roughly $10,000–15,000/t Li₂CO₃, with the July 2026 lower band at $10,000–20,000/t — which makes the economics of a unit that does not depend on lithium alone the relevant question.
Refining concentration. China accounts for approximately 65–70 % of world lithium processing. America can extract lithium from its own land and still send it to be refined abroad; compact local refining removes that step.
Resource. Salton Sea is one of the most mineralized geothermal basins on the planet, with a lithium resource estimated at up to 4 million t — enough for a large share of world demand — alongside approximately 1.88 million t of rubidium and approximately 340,000 t of cesium in the same water. Smackover brines in Arkansas and East Texas are already being pumped for lithium and bromine. Many deep waters written off today for salinity are liquid deposits.
Typical Project Economics
Full-stream case, 1,000 m³/h (~8.8 million m³/year):
| Item | Value |
|—|—|
| Lithium, ~8,000 t Li₂CO₃ × $12/kg | ~$96 million/year |
| Lithium, article basis: ~9,000–10,000 t Li₂CO₃/year | anchor product volume at Salton Sea concentration |
| Water, 8.7 million m³ × $1.2/m³ | ~$10 million/year |
| Salt, 880,000 t × $40/t EXW | ~$35 million/year (~$53 million at the $60/t post basis) |
| Water and salt combined | ~$45 million/year — pays off the unit before lithium |
| Reinjection and disposal avoided | ~$5 million/year |
Salinity at Salton Sea is higher than the 100 g/l reference used for the salt line, so that figure is an understatement rather than a target. Where rubidium and cesium are taken from the same stream the combined basket reaches approximately $980 million per year — see ARBOK-Rubidium and ARBOK-Cesium.
Geothermal co-production, per ARBOK-GEYSER. At Salton Sea chemistry (Li 202 mg/l) the same hydraulics — 25 l/s, 405,000 m³ per season — carry approximately 82 t of lithium, or about 435 t LCE, through the module per season. At the conservative recovery assumption and the lower price band, lithium alone contributes $3–6 million per season — three to six times the entire heat effect of the well, and the reason the monetization ladder runs from about $0.22 million for the electricity route to $5–10+ million per year for heat plus metals on the same water, wells and crews.
Risk Factors
Price exposure. Lithium carbonate has already collapsed from its peak; a project whose economics rest on lithium alone is exposed, which is precisely the structural weakness of the DLE route and the reason the multi-stream basket matters.
Technology and scale-up. Selective-recovery scale-up and the compact refining stage need field validation; the recovery assumption for the selective stage must be proven on each specific feed — whole-stream retention in the dry residue is architectural, but finished-product yield is feed-dependent.
Feed variability. Brine concentration and salinity vary between wells by orders of magnitude; the reference numbers above are Salton Sea chemistry and do not transfer to other fields without assay.
Commercial. Battery-grade offtake and specification qualification; incumbent DLE vendors and operators defending installed process chains; a field reference site is still required.
Salt merchantability. Salt price bands are wholesale indications; realizable value depends on fraction purity and local logistics.
Related Technologies
ARBOK-Rubidium · ARBOK-Cesium · ARBOK-GEYSER · ARBOK-VC (Vacuum Cracking) · ARBOK-CRYSTALLIZER · ARBOK-CHLORIDE · Arbok-BioLi · ARBOK-SODA · LiGra-BATTERY(Lithium-Graphene) · ARBOK-Lithium