Gold-锑 ore sorting characteristics

Gold - bismuth ore usually contains not less than 1.5 to 2 g/ton of gold, and contains 1 to 10% of antimony. Antimony minerals mainly stibnite present in a native ore (Sb ₂ S _2), the oxide ore except stibnite, there antimony China (Sb ₂ O _3), antimony germanium stone (Sb ₂ O _4), An oxide such as bismuth ore (Sb ₂ O ₃ ). This type of ore often uses a re-election-flotation-baking-cyanide combination process. In the treatment of gold-rhenium ore, mixed flotation can be achieved with xanthate and a foaming agent in a neutral or alkaline medium (pH = 8). Conventional flotation separation of lime or caustic soda, sodium sulfide, antimony minerals suppressed, separation flotation gold sulfide activated with copper sulfate, may be alkaline pulp, gold sulfide inhibition with cyanide, lead to activation salt The bismuth mineral is subjected to separation flotation. If mixed tailings are not available for mixed flotation, it is best to use stage flotation or to recover gold from the flotation tailings by cyanidation.
A selected plant in China processes gold-bismuth- sinter-tungsten ore. Metallic minerals mainly gold, stibnite, scheelite, pyrite, which is the other metal sulfide. The main gangue of quartz, followed by calcite, apatite, sericite and the like. The ore contains 3% mud. The useful mineral is present in the gangue with a non-uniform inlay. The scheelite coarse particles have been dissociated at 6 mm, and the fine particles have a basic solution at 0.074 to 0.10 mm. The gold starts to appear from 1 mm, and when it is -0.1 to 0.2 mm, the dissociation is more complete. The plant adopts a re-election-flotation joint process, and the flow chart is shown in the figure below. Production indicators and operating conditions are as follows:
Gold flotation: xanthate 46 g / t of coal oil 8.2 g / t of sulfuric acid 46 g / ton, 91 g sodium fluoride / t.
Gold-锑 flotation operation: 200g/ton of xanthate, 80g/ton of black medicine, 2# oil, 100g/ton of lead nitrate, 70g/ton of copper sulfate.
The scheelite flotation operation: oleic acid 120 g / ton, sodium carbonate 3000 ~ 4000 g / ton, water glass 1000 g / ton.
The qualified antimony concentrate contains 61.94% of antimony, 17.6 g/ton of gold, the recovery of rhodium is 91.4%, and the recovery rate of gold is 53.5%.
Heterogeneous gold: The recovery rate of gold is 34%.
The tailings contain 1.2% bismuth, the recovery rate is 8.6%; the gold content is 0.87 g/ton, and the recovery rate is 12.5%.
The ore contains 11.59% bismuth and 5.63 g/ton gold. The recovery rate is 11.5%.

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