The fire broke out inside Sims Metal Management on Linden Avenue just after 11 p.m. Monday.
Firefighters were battling the flames from land and from a marine vessel, and crews in claw cranes have been moving debris out of the way in an effort to aid the fight.
No firefighters were injured, but even after more than eight hours, there was no word on when the fire would be under control.
The complex one of the world's largest recycling plants. The plant recycles 4,000 tons of scrap each day.