Shandong a gold-containing ore pyrite ore by roasting calcine gold output 8.34g / t of. The gold in the calcination is fine-grained, and the particle size is less than 0.074 mm. Among them, 0.074～0.053mm accounted for 20.30%, 0.053～0.037mm accounted for 23.20%, 0.037～0.010mm accounted for 24.50%, and less than 0.010mm accounted for 32.00%. As the ore is oxidized and roasted, the texture is loose and the cleavage is increased. The gold particles just lose the knocking mineral (sulfurized mineral) and are more dissociated into monomers, which provides conditions for flotation and enrichment of gold.
The flotation of gold uses three-stage grinding and three-time flotation operations, each producing a rough gold concentrate. In order to fully disperse minerals and inhibit oxides such as slime and hematite, sodium carbonate (2000-5000g∕t), carboxymethylcellulose (100-900g∕t) and 20% solids are added to each section of the grinding. Mineral pulp. The flotation collector uses ammonium black medicine and foaming agent 2 # oil, and adopts divided dosing and batch scraping. The results of the flotation test of the obtained concentrate containing up to 324 g of calcined sand are listed in the table below. The total recovery of gold in the three concentrates was 88.90%, and the average gold content was 100.42g∕t. The tailings and slime contain 1g ∕t of gold.
Table Trial ore flotation process test results of pyrite concentrate
product | Yield ∕% | Gold grade ∕g·t -1 | Gold distribution rate ∕% | |||
One concentrate | 1.96 | 7.395 | 281.86 | 100.42 | 66.22 | 88.90 |
Secondary concentrate | 2.615 | 44.15 | 13.84 | |||
Three concentrates | 2.82 | 26.14 | 8.84 | |||
Tailings | 44.84 | 92.605 | 1.00 | 1.00 | 5.38 | 11.10 |
Mud | 47.765 | 1.00 | 5.72 | |||
total | 100.00 | 100.00 | 100.00 | 100.00 | ||
The test results show that in order to obtain good indicators, the sludge and oxide should be inhibited before flotation, and sufficient flotation time (the total time of three flotations is 48 minutes) should be ensured, and the pesticides should be added in several stages. In this way, the gold particles can be floated evenly and for a long time, and the concentration of the chemical agent in the initial stage of the flotation can be prevented from being excessively increased.
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