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Stabilization of Chromium(VI) from Chromic Slag with Two Types of Thiol Collectors

Two thiol collectors, sodium diethyldithiocarbamate (DDTC) and potassium ethyl xanthate (EXT), were adopted to stabilize hexavalent chromium from chromic slag. The average usage of each thiol collector is 62.5 μmol∙g-1 in chromic slag. The leaching characteristic of Cr6+ in chromic slag was analyzed according to the acidic extraction process with the toxicity characteristic leaching procedure (TCLP) and the procedures of extraction in water with the horizontal vibration method (HMV). Under the 0.1 mol∙L-1 TCLP and HMV conditions, we compared them with FeSO4 and found that two thiol collectors presented better stabilization effects for Chromium (VI) from chromic slag, especially the effect by DDTC is more stabilized than that by EXT. The rate of their stabilized treatments is 78.42% and 83.18%, respectively, which both are obviously higher than that by FeSO4. Heavy metal-thiol collectors such as flocculent mass is more stabilized under the neutral and alkalized conditions (pH>8), but it may be partly dissolved under the acidic conditions (pH<6) and the leaching amount of Cr6+ from chromic slag will increase quickly with pH decreasing.