Chlorination yields gallium from zinc by-products

image of preliminary flowsheet  and model for Ga extraction from zinc plant residue via chlorination roasting. 
Preliminary flowsheet  and model for Ga extraction from zinc plant residue via chlorination roasting. 

CMI researchers from Colorado School of Mines conducted the research for this highlight.

Innovation 
Recovery of Ga, Ge, and In from Zn by-products by chlorination. 

Achievement 

  • Up to 60% recovery of Ga from smelting residues has been achieved by chlorination, an alternative to hydrometallurgy that requires relatively low temperatures.
  • Development of preliminary flowsheet and model. 
  • Co-production of Ga, Ge, and In with greater yield of Zn. 

Significance and Impact
Potential to lower the importation of Ga into the United States by opening a domestic supply from industrial waste with co-production of Ge and In. 

Hub Target Addressed 
Develop highly selective separation from complex sources; recover and convert CMs into high-value refined products.