By Thomas Michel, Hugo Fournier
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Coal affinity indexes By analyzing ranges of the coalphile indexes (the latest column in the table 1), one can divide the elements in four groups: (a) non-coalphile elements (coal affinity indexes are <1) : I, Cl, Mn, Br, Rb, Cs; (b) weakly or moderately coalphile elements (coal affinity indexes range from 1 to 2): Ti, Zr, F, Cd, V, Ta, Cr, Y, Li, P; (c) coalphile elements (coal affinity indexes range from 2 to 5): Ni, Hf, Sn, La, Co, Ba, Sc, Nb, Sr, Th, Ga, Cu, REE, Zn, W, Au, In, Pb, U, B, Be; (d) highly coalphile elements (coal affinity indexes >5): Ag, Sb, Tl, As, Mo, Ge, Hg, Bi, Se.
1998) analyzed the content of fluorine in the ash water of Kaifeng coal-fired power plant in Henan province from April to July, 1998 (Table 16) [43]. They found that the concentration of fluorine in ash water exceeded the class Ċ of the national integrated wastewater discharge standard (GB 8978-1996) sometimes, and the pH of ash water always exceeded the class Ċ standard too. The conclusion they gained is the concentration of fluorine in ash water may exceed the class Ċ of the national integrated wastewater discharge standard when the content of fluorine in coal is more than 190 ȝg/g.
Ketris and Ya. E. Yudovich 1. W. S. Geol. Survey), who first calculated average composition of various rocks, and later, the earth’s crust. 1. Meaning of the Russian Term “Clarke” Fersman gave the name “Clarke” to the average content of given chemical elements in the Earth’s crust and also in the hydrosphere. This term very soon took root in Russian literature, but, up to now, has been nearly unknown to Western researchers2. , including “coal Clarkes”, i. e. average trace element contents in the World coals.