For more than 30 years, QC Corporation and its affiliate company Add-Iron Corporation, has been North America's leading processor of dried Ferrous Sulfate. QC Corporation began Ferrous Sulfate drying operations in Baltimore, MD in 1971. In 1981, QC Corporation moved to Cape Girardeau, Missouri to meet anticipated growth and reduce transportation costs. Our 140,000 sq. ft. production and warehouse facility has undergone 5 expansions since its startup. Add-Iron Corporation's 96,000-sq. ft. produc...