Oxidised leaching selenium from Ni-Mo ore smelter dust in mixing solution system of H2SO4-HCl-H2O.

The thermodynamics were studied of the oxidation leaching of Se in H2SO4-HCl solutions from Ni-Mo smelter dust grading 5.47% Se. Under optimum conditions a Se leaching rate of 98% was obtained with the leach residue containing only 0.16 wt% Se. In the smelter dust Se occurred in elemental form but no Se or its compounds were detected in the leach residue, which consisted mainly of SiO2, CaSO4, Al2SiO5, As2O3 and KAlSi3O8.
The thermodynamics were studied of the oxidation leaching of Se in H2SO4-HCl solutions from Ni-Mo smelter dust grading 5.47% Se. Under optimum conditions a Se leaching rate of 98% was obtained with the leach residue containing only 0.16 wt% Se. In the smelter dust Se occurred in elemental form but no Se or its compounds were detected in the leach residue, which consisted mainly of SiO2, CaSO4, Al2SiO5, As2O3 and KAlSi3O8.