Metallurgical dust

Fig. 8.26 Effect of binder type on the crushing strength of briquettes made from metallurgical dust [8.2.1]. Amounts of binder added waste paper, 2% molasses, 6% lime, 6% starch, 6%...

Metal distribution among fractions 1-7 depended obviously on the metal itself, i.e. on its chemical properties, and on its origin in the soil (geogenic or anthropogenic, i.e. from metallurgical dust, see Tables 6.4, 6.5, and 6.6). Among the el-... 

In the end, it is worth mentioning that another kind of approach could still be undertaken to determine copper and lead forms in soils polluted with metallurgical dust. This is namely the direct electron microprobe analysis (Hiller and Bruemmer 1989 Weber and Kowaliiiski 1987 Weber 1989). However, some attempts to apply this method to the soils from copper smelter neighbour-... 

VasiPchenko Yu.M., Akhmetshina L. F., Shklyeva D. A. et al. Synthesis of carbon metal containing nanostructures in PVC and PVAc gels with metallurgical dust, in Nanomaterials Yearbook - 2009. From nanostructures, nanomaterials and nanotechnologies to nanoindustry. -N. Y Nova Sci. Publ. Inc., 2010. - Pp. 283-288. 

Metallurgical dust, fumes— — Ammonium chloride fumes... 

Zinc dust is used in the sherardizing process where work pieces are tumbled with zinc dust in rotating steel dmms which are heated electrically or by gas to 370—420°C (149). The steel parts are uniformly coated with zinc. In the chemical and metallurgical industries, zinc dust is used as a reducing agent, in the manufacture of hydrosulfite compounds for the textile and paper industries, and to enhance the physical properties of plastics and lubricants (2). 

Safety- or health-hazard ehmination, as in collection of siliceous and metalhc dusts around grinding and drilling equipment and in some metallurgical operations and flour dusts from milling or bagging operations... 

Metallurgical equipment has long been an obvious source of air pollution. The effluents from metallurgical furnaces are submicron-size dusts and fumes and hence are highly visible. The emissions from associated coke ovens are not only visible but odorous as well. 

Fabric filters can be more costly to operate and maintain than electrostatic precipitators, cyclones, and scrubbers however, fabric filters are more practicable for filtration of specific dusts. For example fabric systems are the typical control method for toxic dusts from insecticide manufacturing processes, salt fumes from heat treating, metallic fumes from metallurgical processes, and other applications. Any other control method may not be as efficient, nor economically feasible for such applications. 

Solid effluents arising from metallurgical operations occur principally in two forms fine particulate solids or dusts, and solid wastes. As an example, blast furnace gas may contain up to 170 kg of dust per ton of pig iron produced. Suitable methods must be devised for processing the solid effluents for two reasons (i) to prevent pollution of the environment and (ii) to recover their valuable content, if any. As far as the latter is concerned, reference may be drawn, as an example, to the recovery of rhenium from the exit gas from molybdenite roasting in a multiple-hearth furnace. 

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