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Selective Recovery of Lithium from Geothermal Brines

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Selective Recovery of Lithium from Geothermal Brines ( selective-recovery-lithium-from-geothermal-brines )

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Market Transfer Activities SRI’s lithium-extraction process is based on a patent pending, selective, low-cost, and reusable sorbent processed in the form of microporous beads that allows rapid and selective capture of lithium ions from brines. The sorbent is then regenerated to produce lithium carbonate. SRI’s technical and business development project staff worked closely to promote outreach of the newly developed process with the public and commercial entities. Public outreach was planned by online dissemination of project information and by presenting technical progress to geothermal stakeholders at appropriate scientific meetings. The project was highlighted on SRI’s webpage: https://www.sri.com/work/projects/lithium- recovery-geothermal-operations. In 2018, SRI presented a paper on the technology developed under this contract at the 43rd Workshop on Geothermal Reservoir Engineering at Stanford University held on February 12 – 14. The paper, entitled “Selective Recovery of Lithium From Brines,” was published online in the workshop proceedings shortly after the workshop ended. SRI filed two pending patents that cover the lithium-extraction process technology. 1. “Metal ion extraction from brines,” WO 2018035463, was filed on August 18, 2017. The disclosure describes hybrid sorbent beads for the selective extraction of lithium from brines prepared from nanostructured ion sieves and lithium-imprinted polymers. A process to regenerate the sorbent by direct treatment with CO2(gas) is also described. 2. “Concentrating lithium carbonate after regeneration of lithium sorbent” was filed on December 21, 2018. The disclosure describes systems and techniques for selectively extracting metal ions from metal-containing liquid media, such as geothermal brine. Methods to concentrate lithium bicarbonate solutions and enable the production of high-purity lithium carbonate are described. For SRI’s lithium-extraction process to be successful, it should be scalable to a commercial- scale plant and generate profit after accounting for all expenses and investments. ASPENTM software was used to model the process based on data obtained from lab-scale adsorption/regeneration experiments and assumptions for polishing and concentrating lithium in subsystems. The process was scaled to produce 20,000 tons per year of lithium carbonate equivalent. Major equipment sizes were determined from the model, and the cost of equipment was estimated based on data available from various websites and literature. The Chemical Engineer’s Plant Cost Index (CEPCI) was used to update the estimated equipment costs where applicable. In addition to the capital expenditure (CAPEX) for acquiring the equipment, various other factors required for setting up a commercial scale production facility were taken in account based on accepted industry practices and included in the cost estimates. Factors like equipment installation costs, piping and interconnects, instrumentation and controls, electrical services, and others, are included in the cost estimates along with engineering design costs, supervision costs, and legal and contractual costs. Utilities like electricity, process water, steam, waste treatment, and consumables were estimated based on the process information, and costs were estimated based on industry practices for such utilities. In addition, operating labor costs were taken in account using published information on similar processes to estimate 23

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Product and Development Focus for Infinity Turbine

ORC Waste Heat Turbine and ORC System Build Plans: All turbine plans are $10,000 each. This allows you to build a system and then consider licensing for production after you have completed and tested a unit.

Redox Flow Battery Technology: With the advent of the new USA tax credits for producing and selling batteries ($35/kW) we are focussing on a simple flow battery using shipping containers as the modular electrolyte storage units with tax credits up to $140,000 per system.

Our main focus is on the salt battery. This battery can be used for both thermal and electrical storage applications.

We call it the Cogeneration Battery or Cogen Battery.

One project is converting salt (brine) based water conditioners to simultaneously produce power.

In addition, there are many opportunities to extract Lithium from brine (salt lakes, groundwater, and producer water).

Salt water or brine are huge sources for lithium. Most of the worlds lithium is acquired from a brine source. It's even in seawater in a low concentration. Brine is also a byproduct of huge powerplants, which can now use that as an electrolyte and a huge flow battery (which allows storage at the source).

We welcome any business and equipment inquiries, as well as licensing our turbines for manufacturing.

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