The Hillgrove antimony deposit in New South Wales, Australia is an early-exploited deposit with an average width of only 300-400 mm. In 1969, the New East Australian Mining Company (NEAM) operated a small mine and plant.
Mine-containing quartz vein type gold deposits stibnite, mainly associated minerals as pyrite, pyrrhotite, arsenopyrite, and chlorite scheelite ore containing Sb ~ 4.5%, Au ~ 9g / t. The produced ore is subjected to grinding, re-election and flotation, and the produced ore concentrate is sold to the smelting plant. The concentrate contains 30-40 g of gold, and the smelter does not pay any compensation. In order to extract the gold, the factory has been tested by the cyanidation method, and the effect is not good. Later, when testing other solvents, it was found that thiourea can quickly leach the bare gold in the concentrate. In March 1982, a small batch thiourea leaching workshop for 1t∕h was established.
The workshop's treatment of antimony concentrates is only to recover the monomer dissociation gold, and does not seek higher gold recovery. Therefore, using higher concentrations of thiourea and Fe 3 + and premixing the immersion liquid with the concentrate, the pure leaching time of each batch of concentrate can be shortened to no more than 15 minutes. The gold in the leaching solution is adsorbed by activated carbon, and the gold-loaded charcoal containing 6-8 kg of gold is directly sold. After adsorbing gold, the thiourea solution is added with H 2 O 2 to adjust the oxidation-reduction potential and then returned to the leaching process for recycling.
In the first few months of leaching with thiourea, there has been a loss of dissolved gold deposits which have been identified as being adsorbed on chlorite in the concentrate. Therefore, an air inhibitor 633 is added during flotation to suppress chlorite, and a small amount of diesel is added to the slurry before leaching. After taking these measures, the bare gold can be leached, the gold recovery rate in the concentrate is 50% to 80%, and the thiourea consumption is usually below 2kg∕t.
The company also found that the arsenopyrite in the flotation tailings contains a large amount of gold, so it increased the arsenopyrite flotation circuit, and the produced arsenic concentrate contains As15%-20%, Sb5%, Au150～200g∕t, tail. The recovery rate of gold in the mine is ~70%. To this end, in 1983, a 600t∕d early tailings reprocessing plant was built, which can recover 1~2.5g of gold per ton of tailings.
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