Gold - copper sulphide ores are primarily metallic minerals chalcopyrite, pyrite. In addition to arsenic pyrite, pyrrhotite, etc. in addition to chalcopyrite in copper minerals, there are also chalcopyrite, porphyrite, copper blue. Gold and chalcopyrite have a close relationship. In addition, gold is also present in pyrite and other sulfides, and the gangue contains less gold.
The main feature of the gold-copper sulfide ore sorting process is that the gold-copper concentrate is directly sent to the smelting plant for treatment by flotation. If the grinding product contains coarse gold, it can be recovered by amalgamation or re-election in the grinding-grading cycle. If there is gold-containing heavy metal sulfide in the flotation tailings, a re-election equipment shaker (or chute) should be used for sweeping. For example, a gold mine in China uses a chute to treat copper flotation tailings. 40% of the gold was recovered from it. The gold-copper ore principle process (Figure 1) has the following types:
Figure 1 Gold and copper ore flotation principle process
Process I only selects gold-copper concentrates to inhibit pyrite. Often because the gold grade of tailings cannot be discarded, this process can only be used under the following conditions: (1) the ore contains no particulate gold, (2) the ore associated with gold in the ore and the grade is low, most of the gold is present in pyrite. in. For example, the ore processed by a gold ore plant in China is associated with gold ore. First, about 40% of gold is selected by amalgamation method, and then flotation is carried out to enrich 40% to 50% of the gold into the copper concentrate. The flotation tailings contain 0.2-0.3 g/t of gold and are discarded. If abandoned tailings are not available, then re-cyanide in the flotation tailings should be considered. [next]
Process II is the priority flotation process. The gold-copper concentrate, the iron sulfide concentrate, and the tailings are finally selected from the ore.
Process III is a mixed flotation process. Compared with Process II, it is more likely that waste tailings will be obtained.
Process IV is an equal floatable process. It can separate the easy-floating gold-sulfide and the non-floating gold-sulfide two components. Obviously, due to the different floatability, the selection conditions required for each are different. As in Process IV, the easy-floating gold-copper mineral and pyrite particles can be selected into the mixed concentrate I by first adding only a small amount of the collector . When the mixed concentrate I is separated and floated, it is necessary to increase the amount of the inhibitor to suppress the pyrite and select the high-grade gold-copper concentrate I. In the case of refractory gold sulfide mixed flotation, the amount of collector should be increased in order to fully recover the useful mineral particles that are difficult to float. When mixing concentrate II for separation flotation, only a small amount of inhibitor can be added. Because at this time there is no easy to float pyrite particles in the concentrate. With the same floatable process, the required equipment is slightly more than Process II and Process III, but the flotation index is high and the consumption of chemicals is low.
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