New Oak Dayton Tal (New Occidental) gold mine, the original use of slate and sandstone silicide processing ore containing fine gold cyanidation. Containing ore consumes about 1% of the cyanide brass ore and 1% to 2% of pyrrhotite. The latter requires careful control of the alkalinity of the solution to reduce cyanide consumption and increase gold recovery.
Although the plant has been discontinued, the process of using lead oxide to reduce the consumption of cyanide and improve the extraction rate of gold (Fig. 1) in the original operation is of practical significance.
Figure 1 New Oakton Gold Mine Process
The plant's original capacity to treat ore was 8,000 tons per month. The ore is broken to -9.5mm, and lime, cyanide and lead oxide are added to the two-stage closed-circuit process to 90% -0.074mm (200 mesh). The slurry concentrated by the classifier was stirred and cyanated for 30 h in 4 Defro mixers connected in series. The solution was kept to contain 0.06% NaCN and 0.007% CaO. The consumption of the medicament was NaCN 1.14 kg ∕t, CaO 1.4 kg ∕t, and PhO 300 g ∕t.
The precipitate produced by cyanidation is calcined and then oxidized with an oxidant to produce a high-copper gold ingot, which is then smelted together with sulfur to remove some copper, producing 86% gold, 4% silver and base metal (mainly It is copper) 10% of the combined gold ingot.
The ore contains 8.7 g of gold and the recovery of gold is 91%.
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