It happened at about 7 am Tuesday at the business off Cedar and Central avenues in southwest Fresno.
Fire crews say two workers were on the top of the silo at the time of the blast.
One of the workers was burned.
The silo is 100 feet tall, but both workers were able to get down on their own.
The injured person was taken to the hospital.
The company plans to unload the material out of the silo to figure out what caused the explosion.