Alexander Salak was assigned to the Rockford IceHogs of the AHL.
The deal is for $600,000 and is a one-way deal, a source told ESPN.com's Pierre LeBrun.
"We're in the fortunate position to have to make a difficult decision on two netminders that impressed throughout our entire training camp," general manager Stan Bowman said in a statement. "Having both Ray Emery and Alexander Salak as a part of the Chicago Blackhawks organization makes us stronger in both the short term and long term."
The 29-year-old Emery has played for Ottawa, Philadelphia and Anaheim in seven seasons in the NHL. He spent last season with the Ducks, going 7-2-0 during the regular season with a 2.28 goals against average in 10 games. He also appeared in six postseason games with Anaheim.
The Blackhawks' training camp roster now stands at 26 players, including 16 forwards, eight defensemen, and two goalies.
Information from The Associated Press was used in this report.