Browse

This paper deals with the effect of the addition of lead nitrate and ultra-fine grinding on the cyanidation of an antimonial refractory gold and silver ore. The results indicated that the recovery of gold was enhanced by 10\%, but, silver extraction did not improve with adding lead nitrate or increasing its concentration. Fine grinding (e.g. down to-5$\mu$m) did not produce the desired effect on the extraction of Au and Ag.

In this study, the effect of roasting and alkaline sulphide leaching pre-treatments on gold and silver recoveries by cyanidation from an antimonial refractory ore was investigated. Alkaline sulphide leach test for decomposition of antimonial sulphides were performed using Na2S and NaOH solution as leachant. Up to 85\% of antimony was removed by suitably adjusting the molar concentration of the leachant solution over two hours of leach time. Gold recovery in cyanidation was low (≤50\%) without pretreatment, but i...

This paper presents the results of magnetic separation tests for the recovery of colemanite from the ore and the tailings produced in Kestelek (Turkey) Processing Plant. Crushed ore (30.76\% B2O3) and tailings (31.76\% B2O3) samples were wet screened and classified into different size fractions. Size fractions coarser than 75 $\mu$m were subjected to three-stage magnetic separation using a high intensity permanent magnetic separator. The mineralogical composition of the ore and the tailings appears to enable gangu...

In this study, the mineralogical properties and the amenability of Mastra (G\"um\"uşhane-Turkey) gold ore to gravity recovery using a Knelson Concentrator were examined. The mineralogical analysis of the ore has shown that gold occurs as particles of 1-300 mm in size. In the gravity tests performed on the ground ore (-74 •m) a concentrate containing 771.95 g/t Au was produced at 47.15 \% recovery and 1.58\% yield. Enrichment ratios of Au, Ag, Cu, Pb, Zn, Ni and As were found to be 29.7; 16.7; 2.9; 1.58; 3.15; 1...