A method and apparatus for recovering gypsum from spent cement kiln dust for reuse within a cement making process as a filler for use in the production of Portland cement. The invention advantageously provides for a method of producing a fertilizer as a byproduct of the gypsum production process. The invention also provides a method of producing Portland cement using the gypsum derived from the cement kiln dust.
Jerry Key (1989-1993), James Dick (1964-1967), Robert Barnes (1986-1990), Gailynne Hammond (1978-1986), Cody Clayson (1992-1999), Mike Dela Vega (1969-1973)
Margaret Giddens (1960-1964), Eugene Danner (1964-1968), Collis Faniel (1963-1967), Mary Goods (1958-1962), Jerry Key (1963-1967), Marilyn Gamble (1970-1974)