Coral dust

Ambler (I960) found that humidity and temperature in the tropics magnify effects (Table 2.6) but reported no apparent direct correlation between corrosion and the presence of these three chemical compounds. Airborne chlorides responsible for increased corrosion in tropical and desert areas were reported by Compton (1947) and Machu (1954). Compton noted that corrosion caused by condensed moisture in some tropical islands is aggravated by chlorides from coral dust. Machu noted a similar effect on zinc in Egypt about 225 km from the sea. The desert sand and dust at this location... 

Einsteinium (Z = 99) and fermium (Z = 100) were identified in 1952 and 1953, respectively, by Ghiorso and others in the radioactive debris of the first thermonuclear explosion. Hints of the formation of these elements were found in dust samples from the remotely controlled aircrafts used in this test. Then, the elements were isolated by processing larger amounts of the radioactive coral material from the test site and named in honour of Einstein and Feimi. The elements had been formed by multineutron capture,... 

Red-mud primary settlers Red-mud washers Red-mud final thickener Trihydrate seed thickener Cement, West process Cement kiln dust Coral... 

Nevertheless, when we add up all the metals which have been measured with some degree of confidence up to now, we find that they account for no more than ss 10 — 15% of what we expect to have been produced by z = 2.5 (last column of Table 3). Where are these missing metals Possibly, U (DLA) has been underestimated, if the dust associated with the most metal-rich DLAs obscures background QSOs sufficiently to make them drop out of current samples. However, preliminary indications based on the CORALS survey by Ellison et al. (2001) suggest that this may be a relatively minor effect (see also Prochaska Wolfe 2002). The concordance in the values of U (IGM)... 

Spent foundry sand consists chemically of siUca sand coated with a thin film of burnt carbon, residual binder (bentonite, sea coral, resins), and dust. Figure 3 shows the chemical composition of a typical sample of spent foundry sand as determined by x-ray fluorescence. 

Examples of a few are alpha cellulose, ash, calcium carbide, calcium carbonate, carborundum, channel black, china clay, coral, coke dust, diatomaceous earth, dolomite [double carbonate of lime and magnesia filler having the formula (CaCOg) and (MgCOg)], ferrite, flint, fixller s earth, glass spheres, hemp, keratin, lampblack, leather-dust, macerate... 

The adhesive forces may also vary with the roughness of the particle. Thus, the adhesive force between the particles of coke shape [152] possessing microscopic surface roughness and a plane surface is smaller than that of smooth spherical particles of the same material. This is because contact between the coke-shaped particles and the plane is effected at individual points, which reduces the contact area and hence the adhesive force. Coke-shaped powders include coal and silica gel particles [153] as well as particles of dust and ashes formed in nuclear explosions in carbonate soils (coral reefs), when the soil particles are decarburized and acquire a flocculent shape [157] similar to that of coke. In general, powders of coke shape may be obtained by combustion of the volatile components from the particle surface. 

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