Metallic products rarely have been dumped in final disposal sites because metals are recyclable materials. Slag and dust are generated when metallic scraps are melted and refined. The dust includes environmentally regulated substances, so it must be treated appropriately. The slags have been reused as construction materials, roadbed materials, and others. However, dissolution of regulated substances such as arsenic, cadmium, mercury, lead and others, from the slags becomes the problem for these uses. The leaching test is provided to check the dissolution quantities of the regulated substances. If the eluted concentrations of them are higher than the environmental quality standards, the slags cannot be used and dumped. The various leaching tests are summarized in this chapter. In addition the tramp elements, which cannot be removed from molten steel in a refining process for scraps, are described in this chapter.
KeywordsNitric Acid Solution Environmental Quality Standard Public Announcement Toxicity Characteristic Leach Procedure Steel Scrap
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