REMOVAL OF LEAD, CADMIUM AND BORON FROM UM-GHEIG Pb-Zn SPENT ORE SAMPLE

摘要

Um-Gheig Pb-Zn representative sample was collected from the main adite of Um-Gheig mine along Red Sea coast in Egypt. Its chemical analysis shows that, it contains 16% Zn, 2.3% Pb, 0.1% Cd and 0.1% B as elements of interest. After H2SO4 agitation leaching, the chemical composition of Um-Gheig Pb-Zn deposit ore residue assayed 2.26% Pb, 1.5% Zn, 0.085 % B and 0.01% Cd. This residue was leached with 20% HC1 at S/L ratio 1/3 for 2 hours at 80°C. The chloride leach liquor was found to contain 18 g/l Pb, 13 g/l Zn, 0.1 g/l Cd and 0.75 g/l B with the corresponding leaching efficiencies 79%, 86%, 100% and 88% respectively.Lead was precipitated from the chloride leach liquor using concentrated H_2SO_4 to obtain PbSO_4 with precipitation efficiency 96%. While boron was extracted by the selective resin Amberlite IRA743 with loading efficiency of 80%. On the other hand, Zn and Cd were precipitated using solution with 86.7% and 100% recovery efficiencies respectively.