Centrifugal classifier sizes up fly ash
A fly ash marketer installs a centrifugal classifier to meet an ash fineness specification.
Western Ash, with headquarters in Phoenix, purchases and markets fly ash precipitated from flue gas streams created during coal combustion at power generating stations. When Western Ash began in 1975, fly ash was already in use on the East Coast as a partial substitute for portland cement in concrete construction and was just beginning to be used in the Southwest for that purpose. Western Ash contracted to buy class F fly ash from Southern California Edison's Mohave generating station at Laughlin, Nev., which had been disposing of its fly ash as waste. From Laughlin, Western Ash could transport the fly ash and sell it at a competitive price in the Southern California market.