Cascade, an alumina feed solution

Printable Version

Fives Aluminium GTC cascade alumina feeding solution visuel 3D-FIVES

Fives has developed a proprietary technology suitable to modern high amperage smelter to further reduce Gas Treatment Center (GTC) emissions and to meet the highest regulations at lower cost. The patented Cascade Feed system is designed for reducing HF emissions both in summer and winter seasons by reverting to conventional feed mode during winter.
In existing installations, this solution allows aluminium producers to boost their production without increasing stack emissions. 

From 30% to 40% HF emission reduction

Cascade Feed technology

GTC HF emissions increase when gas temperature and enriched alumina fluoride content get higher.

To benefit from the relation between HF emissions versus fluoride content of the scrubbing alumina, Fives’ solution is the rearrangement of the conventional alumina distribution systems into a Cascade Feed system. It consists in:

  • Injecting a maximum quantity of fresh reagent in the first scrubber unit of a scrubbing module series installed in parallel, each treating an equivalent quantity of raw gases,
  • Then redirecting the overflow material to the next modules in series, until the material flows out of the last module to ultimately be reused as enriched alumina into the electrolysis cells. 

Conventional technology

In opposition, the conventional alumina feed technology is based on an even fresh alumina distribution among GTC operating modules and equal fluorination levels in each scrubber module. This leads to having approximately the same fluoride concentration at each module: from 1.5% to 2.2% for modern smelters.

HF Abatment & Alumina enrichment

Discover our technologies for Gas Treatment Center

Filtration Technologies

Ozeos, TGT, Vibrair are the various types of filtering solutions

Potroom emissions processing

Yprios or S-yprios, two alternatives technologies to reduce emissions

⇒ For recruitment-related matters (application, etc.), please do not use this form. Make your requests on this page.

In order to address your request, we need to collect the information listed in the form below


Despatch of these emails is managed by a FIVES partner located in the United States, an active member of Privacy Shield. The partner guarantees processing compliant with European requirements for personal data protection. Unsubscribe with a single click on a link in the message received.

* required fields

Your message has been sent and will be treated as soon as possible. Thank you for contacting Fives.

Sorry, we encountered a problem, your message was not sent