Journal of Metals, Materials and Minerals

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Strength and leachability of the solidified plating sludge using OPC and BHA as solidification binders were investigated. BHA was used to replace OPC at 0, 20 and 30 wt.%, and was used to solidify 30 and 50 wt.% of the plating sludge. Results showed that no strength was observed during the first 7 days of curing when OPC was used to solidify the plating sludge. But when 20 and 30 wt.% of BHA were used to substitute OPC, the solidified wastes containing 50 wt.% of the plating sludge gave strength of 4.5 kg/cm2 at the age of 3 and 4.1 kg/cm2 at the age of 7 days, respectively. Leachability of Zn and Cr from the solidified wastes containing all level of the plating sludge did not exceed the criteria for waste acceptable at landfills, which is regulated at 100 and 25 mg/m2 by NEN 7375;2004. The dominant leaching mechanism for all samples was surface wash-off.

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