classified by the European Union as a critical raw material. About half of this
precious mineral is used to produce hydrofluoric acid, which is used in various
industries: It is an auxiliary material in the semiconductor, metal and glass
industries, is used to etch microelectronic silicon wafers and glass, to pickle
stainless steel and for alkylation in the petrochemical industry. Hydrofluoric
acid is considered non-replaceable or only partly replaceable in these sectors.
The “FCycle” project recycles hydrofluoric acid, removing this dangerous substance from waste flows and the environment. In the process, hydrofluoric acid is turned back into fluorite. The recovered mineral is easier and more cost-efficient to transport to the users than the acid. Furthermore, it can then be used to produce hydrofluoric acid again. This makes the project an innovation in both economic and ecological terms. It creates a closed, resource-efficient loop.
project developed a process (patent pending) to transform residue flows
containing fluoride into synthetic fluorite in a cost- and energy-efficient way
and recycle this directly as a secondary raw material for value added
processes. The objective of the follow-up project is to scale up the method
that has been successfully tested in the laboratory to a demonstration plant.
Over the course of the three-year project, a plant will be constructed and
tested to manufacture fluorite with a capacity of up to 900 metric tonnes per
The project consortium is made up of three partners
and is being coordinated by the company Dyneon GmbH. The second industrial
partner is Fluorchemie Stulln GmbH. The demonstration plant will be tested on
their premises. The scientific partner is the Institute InVerTec e.V.
© Fraunhofer ISI 2020