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<br />CHARACTERIZATION OF U.S. CEMENT KILN DUST <br />By Benjamin W. Haynesl and Gary W. Kramer2 <br />ABSTRACT <br />Cement kiln dust (CKD) produced in the contiguous United States and <br />Hawaii was characterized as part of the Bureau of Mines' program in <br />minerals environmental technology. The mineralogical and chemical compo- <br />sition was determined for 113 CKD samples from 102 plants that normally <br />send CKD waste to landfill. Characterization included the determination <br />of 28 elements, 7 anion species, carbon dioxide, noncarbonate carbon, and <br />chemically bound water. Mercury was determined in 16 samples. Interele- <br />ment correlation coefficients were determined for 23 elements, 5 anions, <br />C02, noncarbonate carbon, and chemically bound water. <br />To assess the hazardous waste potential of CKD, the U.S. Environ- <br />mental Protection Agency Extraction Procedure (EP) toxicity test was <br />performed on all 113 CKD samples. All but one sample rere in compliance <br />with the test; the noncomplying sample slightly exceeded the EP toxicity <br />test criterion for lead. <br />!Supervisory research chemist, Avondale Research Center, Bureau of <br />Mines, Avondale, Md. <br />2Research chemist, Avondale Research Center, Bureau of Mines, Avondale, <br />Md. <br />