Lab Method Recovers 90% of Antimony From Plastic

The rapid-heating process from Rice University could help recyclers recover a scarce metal, but it has only been demonstrated in the laboratory.

Updated on Nov. 3, 2026 in Materials Science

Bold flat-color editorial illustration of two charcoal sheets clamping plastic crumb, with a bright electrical arc between them above a steel collector plate. — Rice University researchers reported a laboratory method that recovers 90% of antimony from flame-retardant plastics, though it has not yet been tested at commercial scale. AI Illustration. Upload story photo >

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Rice University researchers developed a rapid-heating method that recovers 90% of antimony from flame-retardant plastics. The method, called isothermal-clamped flash joule heating, uses brief electrical heating and converted 83% of the waste's bromide into hydrogen bromide, a useful industrial chemical. The work is at the research stage; commercial-scale deployment and cost savings were not addressed.

Why it matters

Nearly 39% of global antimony supplies go toward flame-retardant plastics, and electronic waste adds tens of millions of tons of plastic each year. Conventional heating releases antimony in a hard-to-collect form and creates hazardous organic bromide compounds, so a method that recovers both materials cleanly targets a recycling gap that is growing as flame-retardant production rises.

The laboratory tests recovered 90% of antimony and converted 83% of waste bromide into hydrogen bromide, with the plastic held at 392-932 degrees for 9.4 milliseconds per pulse. The results were demonstrated on housings for power supplies, circuit boards, and electrical connectors across several flame-retardant plastic varieties, but not at industrial scale.

The players

Rice University

A Houston-based private research university whose researchers developed the rapid-heating recovery method.

The details

Researchers placed ground-up plastic between two electrically heated carbon-paper sheets and applied several ultrafast heating pulses. Flash joule heating passes a short, intense electrical current through a material to heat it almost instantly, and the team's isothermal-clamped variant holds the temperature in a set range so the antimony evaporates. A collection area then captures the antimony as it condenses, while the bromide is converted into hydrogen bromide, a chemical used in industry.

The results are reported without a specific publication or event date.
Worldwide flame-retardant production is projected to reach 82 million metric tons by 2030.

The Tech Race

The method adapts flash-heating techniques to recover antimony and capture bromide from flame-retardant plastics, a materials-recycling problem that conventional thermal processing handles poorly. The results remain at the laboratory stage and have not been benchmarked against competing recovery approaches.

The method remains at the research stage, so no consumer product or recycling service is available yet and its timeline for commercial use has not been announced. Recyclers and electronics manufacturers are the groups most likely to feel the effect if the process scales.

The takeaway

Watch for a commercial-scale trial or a cost analysis that would show whether the 90% antimony recovery holds outside the laboratory. The research is also worth tracking against the projected 82 million metric tons of flame-retardant production by 2030.