Abstract
This chapter illustrates that soluble Cr(VI) and salt contained in BFD generated in the South African ferrochrome industry can be immobilized in cured cement blocks and fired clay bricks. The latter option is more effective. Water, Acid Rain and TCLP leaching tests conducted on crushed samples of both solid-stabilized products have indicated that more than the permitted (according to DWAF Guidelines) amount of Cr(VI) leached from these solids. Only water leaching tests on whole cured cement blocks have indicated that less Cr(VI) than the permitted values are released and can therefore be disposed of in this manner without posing a threat to the environment.
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