Investigation of chemical associations and leaching behavior of heavy metals in sodium sulfide hydrate stabilized stainless steel pickling sludge
This article presents an original study on stabilization of heavy metals in SSPS using sodium
sulfide hydrate. The speciation and pH dependent leaching of the target heavy metals (Cr,
Cu, Ni and Zn) based on GB 5085.3 and GB 16889 in both raw SSPS and stabilized
products were examined. Results indicated that Cr and Ni are the two main toxic elements in
SSPS. The BCR sequential extraction indicated that 55.2% of Cr in raw SSPS exist as Fe-Mn
oxides, while water soluble Cr which is mainly consists of Cr (VI) accounts for 3.50%. After …
sulfide hydrate. The speciation and pH dependent leaching of the target heavy metals (Cr,
Cu, Ni and Zn) based on GB 5085.3 and GB 16889 in both raw SSPS and stabilized
products were examined. Results indicated that Cr and Ni are the two main toxic elements in
SSPS. The BCR sequential extraction indicated that 55.2% of Cr in raw SSPS exist as Fe-Mn
oxides, while water soluble Cr which is mainly consists of Cr (VI) accounts for 3.50%. After …
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