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6 • • <br />TABLE 2. - Mineralogical composition of U.S. cement kiln dust samplesl <br />-Continued <br />Sample Calcite Lime Anhydrite Quartz Dolomlce Mica Feldspar <br />95 Major Minor Minor <br />96 Major Low Low Low ery low <br />97 Major Low Low Very low <br />98 Major Very Low Low ery low <br />99 Major Low Low Very luw <br />100 Major Very Low Very low <br />101 Major Minot Very low Very Low ery low <br />102 Minor Major Low Very low <br />L03 Major Low Low Low <br />104 Major Minor Low <br />105 Major Low Very low <br />106 Major Minor Very Low Very low <br />L07 Major Very low Very low <br />108 Low Major Very low Very low <br />109 Major Minor Very low <br />110 Major Low Low Very low <br />111 Major Low Low Low Low <br />112 Major Minor Low <br />113 Vecy Low Major Very low <br />Major >30 wt-pct. <br />Minor 10-3U we-pct. <br />Low 5-10 wt-pct. <br />very Low <7 wC-pc[. <br />Blank Not detected. <br />Analysis by C. W. Huggins, research chemist, Avondale Research Center, Bureau <br />of Mines, Avondale, Md. <br />CHEMICAL ANALYSES <br />The chemical analyses of the CKD <br />samples are discussed in three sections <br />as follows: (1) Chemically bound water, <br />carbon dioxide and noncarbonate carbon <br />concentrations; (2) anion concentra- <br />tions; and (3) major, minor, and trace <br />element concentrations. The samples <br />used for the analyses were the blended <br />minus 100-mesh materials. <br />Chemically Bound Water, Carbon <br />Dioxide, and Noncarbonate Carbon <br />The amount of chemically bound <br />water and carbon dioxide (C02) present <br />in CKD was determined using thermogravi- <br />me[ric analysis (TGA). Chemically bound <br />water and C02 are defined as the water <br />and C02 requiring temperatures greater <br />than 1L0° C [o expel them from the <br />material being analyzed. The results of <br />the TGA analyses are shown in cable 3. <br />Chemically bound water was low in all <br />samples, ranging from 0.4 to 3.8 <br />wt-pc[. The C02 content ranged from <br />4.4 to 34.4 wt-pct. No data are report- <br />ed for chemically bound water aini C02 <br />for samples 17, 46, 57-59, 72, 82, and <br />84 because under the high-cemperatu re, <br />low-vacuum conditions of the analysis, <br />vapors from the samples repea[edty <br />corroded the 20-mil platinum-rhodium <br />hangdown wire [o the breaking point <br />before the determination could be made. <br />These samples contained high levels of <br />syLvite (KC1), which attacks platinum- <br />rhodium alloys. <br />