--- title: SELMEXT Selective Metal Extraction | Chromafora description: SELMEXT is Chromafora's selective separation technology for removing unwanted metals and recovering valuable resources from water and process streams. image: https://chromafora.com/hubfs/HEADERS/header-SELMEXT-2026.jpg --- [Skip to content](https://chromafora.com/selmext-selective-metal-extraction#main-content) [![chromafora-logo-white](https://chromafora.com/hs-fs/hubfs/LOGOS%20and%20ICONS/chromafora-logo-white.png?width=150&height=30&name=chromafora-logo-white.png) ![chromafora-logo-green](https://chromafora.com/hs-fs/hubfs/LOGOS%20and%20ICONS/chromafora-logo-green.png?width=150&height=30&name=chromafora-logo-green.png)](https://chromafora.com) Turning wastewater into renewable resources - [TECHNOLOGIES](https://chromafora.com/technology) - [ABOUT CHROMAFORA](https://chromafora.com/about-us) - [INSIGHTS](https://chromafora.com/insights) - [CONTACT](https://chromafora.com/contact-us?purpose_of_inquiry=General) - [TECHNOLOGIES](https://chromafora.com/technology) - [ABOUT CHROMAFORA](https://chromafora.com/about-us) - [INSIGHTS](https://chromafora.com/insights) - [CONTACT](https://chromafora.com/contact-us?purpose_of_inquiry=General) - [Home](https://chromafora.com) / - [Our Technologies](https://chromafora.com/water-treatment-technologies) / - SELMEXT Selective Metal Extraction # SELMEXT [Contact an expert](https://chromafora.com/contact-us) ## Advanced selective metal extraction  SELMEXT is Chromafora's technology platform for selectively separating metals from water and hydrometallurgical process streams. The technology can be used to remove unwanted metals or recover valuable resources, with current development focused on gold, uranium, scandium and mercury. **Selectivity changes the process** Conventional metal treatment often separates several substances together, generating large amounts of sludge and potentially losing metals that still have economic value. SELMEXT is designed around selective separation. The chemistry and process are adapted to the target metal and water matrix, allowing unwanted substances to be removed while other metals remain in solution – creating opportunities for both cleaner water and resource recovery. **Two objectives. One technology platform** Remove unwanted metals – selectively remove targeted metals from industrial water, mining effluents and other process streams, while limiting unnecessary separation. Recover valuable metals – use the same selective approach to extract metals with economic or strategic value for further processing and reuse.   ## The SELMEXT process ![SMX-schematics-horizontal](https://chromafora.com/hubfs/OTHER%20IMAGES/SMX-schematics-horizontal.svg) ![SMX-schematics-vertical](https://chromafora.com/hubfs/OTHER%20IMAGES/SMX-schematics-vertical.svg) [CONTACT AN EXPERT](https://chromafora.com/contact-us) VALIDATED AT PILOT SCALE ## A new approach to gold leaching and recovery Chromafora has developed a process combining thiosulfate gold leaching with SELMEXT-based selective gold recovery – an alternative to conventional cyanide leaching. The process has been tested and validated at pilot scale in cooperation with a Swedish gold mine, and is now being advanced towards system prototype demonstration. [LEARN MORE](https://chromafora.com/insights/thiosulfate-gold-leaching-by-chromafora-high-yield-and-low-costs-confirmed-in-pilot) ![puff-selmext-pilot](https://chromafora.com/hs-fs/hubfs/PUFFS/puff-selmext-pilot.jpg?width=900&height=500&name=puff-selmext-pilot.jpg) ## From laboratory to full scale [**LAB** Laboratory-scale leaching and recovery testing for gold ores and concentrates, starting from approximately 100 grams of representative ground material.](https://chromafora.com/) [**PILOT** Pilot-scale campaigns of up to 2 tonnes per batch at Chromafora's testing facility in Sweden, replicating a future full-scale process as closely as possible.](https://chromafora.com/) [**FULL-SCALE** Delivered through a licensing model, with engineering and project implementation. Chromafora provides process support and SELMEXT chemistry.](https://chromafora.com/) ## Resources [![puff-selmext-rapport-resource](https://chromafora.com/hs-fs/hubfs/PUFFS/puff-selmext-rapport-resource.jpg?width=900&height=500&name=puff-selmext-rapport-resource.jpg) **TS-Selmext Project Report** Executive summary of the three-year pilot with Björkdalsgruvan, validating cyanide-free gold extraction with strong recovery rates. **Download summary**](https://chromafora.com/) [![puff-selmext-resourde](https://chromafora.com/hs-fs/hubfs/PUFFS/puff-selmext-resourde.jpg?width=900&height=500&name=puff-selmext-resourde.jpg) **SELMEXT Product Info** Technology and system overview, from concentration principle to system integration. **Download PDF**](https://chromafora.com/) ## More SELMEXT applications #### **Uranium**  Selective extraction from uranium-contaminated water and process solutions. Currently at TRL 5, with field testing completed and further pilot development planned. #### **Scandium** Selective recovery from suitable mining wastewater and process streams. Currently at TRL 5, with laboratory testing available and pilot testing possible on request. #### **Mercury** Selective removal from gold-cyanide process solutions, without removing gold or silver. Currently at TRL 5.  ##  Have a metal separation challenge?  Whether the objective is removing an unwanted contaminant or recovering a valuable metal, the first step is understanding the material and the process. Chromafora offers laboratory testing and selected pilot programs to evaluate whether SELMEXT is suitable for your application. [CONTACT AN EXPERT](https://chromafora.com/contact-us) ## Technology insights [![Chromafora appoints new Country Manager to drive growth in Denmark](https://chromafora.com/hs-fs/hubfs/INSIGHTS/insight_ahmed_natural.jpg?height=245&name=insight_ahmed_natural.jpg) Chromafora appoints new Country Manager to drive growth in Denmark Press release Aug 6, 2026](https://chromafora.com/insights/chromafora-appoints-new-country-manager-to-drive-growth-in-denmark) [![Chromafora acquires Montrose Environmental Group Denmark](https://chromafora.com/hs-fs/hubfs/INSIGHTS/insight_seijmer_2601.jpg?height=245&name=insight_seijmer_2601.jpg) Chromafora acquires Montrose Environmental Group Denmark Press release Jan 20, 2026](https://chromafora.com/insights/chromafora-acquires-montrose-environmental-group-denmark) [![Thiosulfate Gold Leaching by Chromafora – High Yield and Low Costs Confirmed in Pilot](https://chromafora.com/hs-fs/hubfs/INSIGHTS/insight-gold-pilot.jpg?height=245&name=insight-gold-pilot.jpg) Thiosulfate Gold Leaching by Chromafora – High Yield, Low Costs Press release Dec 29, 2025](https://chromafora.com/insights/thiosulfate-gold-leaching-by-chromafora-high-yield-and-low-costs-confirmed-in-pilot) [![Chromafora to tackle widespread chemical pollution with €22.5 million EU backing](https://chromafora.com/hs-fs/hubfs/INSIGHTS/insight-EIB.jpg?height=245&name=insight-EIB.jpg) EIB funding fuels Chromafora’s growth – strong performance in Q1 and Q2 Press release Jul 2, 2025](https://chromafora.com/insights/eib-funding-fuels-chromaforas-growth-strong-performance-in-q1-and-q2) [![Chromafora recognized for award-winning breakthrough in PFAS treatment](https://chromafora.com/hs-fs/hubfs/insight-chromafora-FandS.jpg?height=245&name=insight-chromafora-FandS.jpg) Chromafora recognized for award-winning breakthrough in PFAS treatment Press release Jun 16, 2025](https://chromafora.com/insights/chromafora-recognized-for-award-winning-breakthrough-in-pfas-treatment) [MORE INSIGHTS](https://chromafora.com/insights) [![chromafora-logo-white](https://chromafora.com/hs-fs/hubfs/LOGOS%20and%20ICONS/chromafora-logo-white.png?width=120&height=24&name=chromafora-logo-white.png "chromafora-logo-white")](https://chromafora.com) ### CONTACT Chromafora AB Vretensborgsvägen 20 126 30 Hägersten, Sweden +46 8 23 53 50 Kildemarksvej 3 4200 Slagelse Denmark BluePoint Brussels Blvd Auguste Reyers 80 1030 Brussels, Belgium [Get in touch](https://chromafora.com/contact-us?purpose_of_inquiry=General) ### INSIGHTS Stay up-to-date with the latest news, articles, videos and more [Go to Insights](https://chromafora.com/insights) ### NEWSLETTER Get the latest Chromafora news to your inbox Chromafora is an innovative cleantech company offering water treatment technologies for removing contaminants while reducing waste through selectivity. The company’s portfolio includes unique, patented water treatment technologies –SELPAXT and SELMEXT – based on proprietary chemistry. Chromafora’s PFAS removal technologies eliminate ultra-short-, short-, and long-chain PFAS from water streams, while its metal extraction technologies target the removal of heavy metals and contribute to the conservation of critical raw materials by enabling the recovery and recycling of valuable metals from waste. © Copyright Chromafora 2026. All Rights Reserved Website by [Orange Bird](https://orange-bird.agency/) [Privacy Policy](https://chromafora.com/privacy-policy) [Cookie Policy](https://chromafora.com/cookie-policy)