The merger of three aluminium companies will create the largest aluminum company in the world - combining Russian Aluminum, SUAL and the aluminum-related company of Glencore.The new company would be worth up to $30 billion, making the new company, `United Company RusAl`, bigger than the current No. 1 aluminum company, Alcoa. RusAl`s Oleg Deripaska (c), SUAL`s Viktor Vekselberg (l) and Glencore`s Ivan Glasenberg (r) shaking hands at the press conference announcing the merger.