KIEV, Dec. 21 - Dmytro Firtash's Group DF plans to invest about $2.5 billion in its titanium business over the next seven years, the group said in a statement.

The modernization of the Zaporizhia Titanium and Magnesium Plant (ZTMK), in which Group DF has become an investor and shareholder, will begin in 2013, along with the construction of new facilities for production of titanium sponge.