Stabilization/Solidification Treatment of Cadmium-Bearing-Residue with Magnesium Slag.

Stabilizing/Solidifying cadmium in residue is a great challenge to the treatment of solid waste. In this work, a new stabilization process was proposed to dispose of simulated cadmium-bearing-residue (CBR) by using magnesium slag of the same high-hydration and gelling properties as a binder. A sharp decline in cadmium leaching contraction from 1415 mg·L-1 to less than 1 mg·L-1 was obtained in this new process. The XRD, FT-IR and XPS results indicated it was hydration products and silicates produced by magnesium slag that could promote cadmium (Cd) to take place of calcium (Ca) and immobilize cadmium in the residue. The European Community Bureau of Reference (BCR) experiment also discovered that more reducible, oxidizable and residual fraction in favour of restrained environmental availability was produced in the process. [ABSTRACT FROM AUTHOR]