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Carbonaceous gold ores, containing carbonaceous matters which rob gold, is a kind of refractory gold ore. Humic acids are one of the gold-robbing carbons. In this paper, humic acids were extracted by mixed alkali heating leaching method from the gold concentrate of a carbonaceous gold mine in Guizhou, and the extraction rate was determined by the potassium dichromate oxidation-titration method. The influencing factors which were researched, were sodium hydroxide concentration, sodium pyrophosphate concentration, solid-liquid ratio, leaching temperature and stirring leaching time. The results showed that the optimum extraction conditions were sodium hydroxide concentration 0.3 mol/L, sodium pyrophosphate concentration 0.06 mol/L, solid-liquid ratio 1:4, leaching temperature 70°C, stirring leaching time 24 h, and the productivity of humic acids was 1.1049%.

Extraction and determination of humic acids in carbonaceous gold ores