The Arizona Department of Environmental Quality (ADEQ) is taking comment until Feb. 29 on a draft air permit that would allow Drake Cement LLC to combust petroleum coke in the kiln at its facility in Paulden, Yavapai County, Arizona.
This Class I Significant Revision to Operating Permit #53336 would be issued to Drake Cement to authorize petroleum coke (petcoke) as a fuel for the cement kiln. Additionally, this revision authorizes the facility to use filter cake as a non-hazardous secondary material to blend in with the raw materials.
This cement plant is compromised of equipment used for raw material receiving/processing, coal preparation/processing, pyroprocessing/clinker production, and final product finishing.
“This revision authorizes the facility to combust petroleum coke in combination with coal in the cement kiln,” said the agency. “This revision also allows the facility to blend in filter cake with the raw materials as a nonhazardous secondary material. … The filter cake is mainly comprised of calcium fluoride which is a valuable ingredient in the cement process, and has been shown to improve combustion and quality of the product produced in the cement process.”