The explosion and fire occurred around 12:30 p.m. at the Noranda Aluminum plant near the town of Marston in New Madrid County, about 170 miles south of St. Louis.
Noranda spokesman John Parker said all workers had been accounted for and there were no life-threatening injuries. He said some people suffered what appeared to be non-critical burns and smoke inhalation.
Parker said one of the injured workers was taken to a hospital for treatment. Others were treated at the scene.
