Sustainable recovery of critical elements from seawater saltworks bitterns by integration of high selective sorbents and reactive precipitation and crystallisation: Developing the probe of concept with on-site produced chemicals and energy

•Solar sea saltworks brines (bitterns) are secondary sources for elements recovery.•Sorption and reactive precipitation/crystallisation key enable technologies.•B evaporation/crystallisation and Sr, Co, Ge and Ga precipitation were performed.•Recovery processes were based on chemicals produced on-site.