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SELMEXT

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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

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How TS-SELMEXT works

Gold is first leached from ore or concentrate using a thiosulfate-based process. The resulting pregnant leach solution is then treated with proprietary SELMEXT chemistry to selectively recover the gold, ahead of cementation and doré production.

The process is designed to enable reuse of water, lixiviant, copper catalyst and SELMEXT reagent – important factors in improving overall process economics.

read about the pilot
gold-nugget

Why SELPAXT?

Long, short
and ultra-
short PFAS

Removes PFAS across a broad range of chain lengths, including compounds that are challenging for conventional treatment technologies.

Minimal
residual
waste

Concentrates PFAS by up to 1,000x, corresponding to a residual waste volume of approximately 0.1% under appropriate operating conditions.

Built for complex
water

Designed for demanding streams with high PFAS concentrations and low sensitivity to TOC and pH variation.

Continuous
and reliable operation

Automatic regeneration and remote monitoring support reliable, uninterrupted treatment.

Where SELPAXT fits

Landfill
leachate

Treatment of PFAS-contaminated leachate with complex, variable water chemistry. 

Industrial wastewater

PFAS removal from industrial process and wastewater streams. 

RO reject 
streams 

Further concentration of PFAS-rich reject streams to reduce the volume requiring final destruction. 

Contaminated groundwater

Treatment of PFAS-contaminated water from firefighting activities and training sites.

PERFORMANCE DATA

Proven in real water

SELPAXT has been demonstrated on several PFAS-contaminated water matrices, including landfill leachate, industrial wastewater, airport-related water and water from firefighting training grounds – with sustained reductions of more than 90% across multiple applications.

See performance data
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Resources

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SELPAXT White Paper
Technology, performance and experience from real-world applications.

Download report
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SELPAXT Performance Data
Verified PFAS reduction results from different contaminated water streams.


See performance data
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SELPAXT Product Info
Technology and system overview, from concentration principle to system integration.

Download PDF

 What does your PFAS water look like?  

Every water stream is different. Water matrix, flow rate, PFAS profile and treatment requirements all influence the right solution. Share your water data with us, and we'll help determine whether SELPAXT is the right approach.

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Technology insights

Chromafora appoints new Country Manager to drive growth in Denmark
Chromafora appoints new Country Manager to drive growth in Denmark
Press release Aug 6, 2026
Chromafora acquires Montrose Environmental Group Denmark
Chromafora acquires Montrose Environmental Group Denmark
Press release Jan 20, 2026
Thiosulfate Gold Leaching by Chromafora – High Yield and Low Costs Confirmed in Pilot
Thiosulfate Gold Leaching by Chromafora – High Yield, Low Costs
Press release Dec 29, 2025
Chromafora to tackle widespread chemical pollution with €22.5 million EU backing
EIB funding fuels Chromafora’s growth – strong performance in Q1 and Q2
Press release Jul 2, 2025
Chromafora recognized for award-winning breakthrough in PFAS treatment
Chromafora recognized for award-winning breakthrough in PFAS treatment
Press release Jun 16, 2025
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