Conventional flotation of copper sulfide ore

Many copper-containing natural minerals, industrial value dozen. The main copper minerals for flotation treatment are chalcopyrite, chalcopyrite, copper blue, and porphyrite. Most of the copper ore processed in China is chalcopyrite ore. All copper sulfide ore contains iron ore (pyrite) more or less, so the flotation task of copper sulfide is separated from iron sulfide and gangue minerals to obtain copper concentrate. If the content of iron sulfide is large, it should be recycled at the same time. Copper ore sometimes contains gold , silver , cobalt , nickel, etc., and comprehensive recovery of these symbiotic ore can be considered.

1. Classification of copper sulfide ore

The industrial types of copper ore in China are: layered copper ore, fine vein disseminated copper, skarn copper, pyrite copper and porphyry copper. About 60% of the world's copper is currently from porphyry copper ore.

The difficulty of copper ore flotation is closely related to the content of iron sulfide in the ore. According to the content of iron sulfide, copper sulfide ore is divided into two types, one is dense brittle copper ore and the other is disseminated copper ore. The former is characterized by high content of pyrite in the ore, sometimes up to 80% to 85%, gangue content is very small, and copper sulfide and iron sulfide minerals are densely symbiotic. The tailings remaining after the ore is selected from the copper sulfide minerals are usually iron sulfide concentrates. If the gangue content is high, the pyrite should be sorted to obtain a pyrite concentrate. The latter's ore body is mainly composed of gangue minerals, and the content of copper sulfide and iron sulfide is low, and it is distributed in the gangue. The majority of our copper ore processing plant is disseminated copper ore.

2. The floatability of copper sulfide ore

The most common copper mineral in China's copper ore is chalcopyrite (CuFeS ₂ , containing 66.49% copper, followed by chalcopyrite (Cu ₂ S, containing 79.83% copper), copper blue (CuS, containing 66.49% copper) Copper ore (Cu ₃ FeS ₃ , 55.5% copper). From the perspective of floatability, the copper ore and copper blue are the most easy to float. They are secondary copper mines with low hardness and easy to mud. chalcopyrite is the most widespread native minerals, flotability or, a typical collector type xanthate, cyanide, it is possible to suppress flotation, heavy chromate, sulfites not inhibit it. plaque The floatability of copper ore is between the copper ore and chalcopyrite.

In summary, the floatability of copper sulfide ore has the following rules:

1 Iron-free minerals, such as chalcopyrite, copper blue, etc., have similar buoyancy. It is less effective when they are inhibited by cyanide or lime.

2 Iron-containing minerals, such as chalcopyrite, porphyrite, etc., are susceptible to cyanide and lime suppression in alkaline media.

3 When harvested with xanthate, the order of its harvesting ability is: chalcopyrite>copper blue>bronite>chalcite. Because the anthocyanin and cations of xanthate are mainly chemisorbed by Cu2+, the more Cu2+ on the surface, the stronger the effect with xanthate.

4 The higher the content of oxidized minerals and copper salts, the more difficult it is to sort. This reduces the recovery of copper minerals; on the other hand, it is difficult to separate from iron sulfide.

5 The coarser the ingot size, the less the slime content, the easier it is to float, and the higher flotation index. Copper sulfide minerals and iron sulfide minerals are densely symbiotic, and the content of slime increases during fine grinding, which causes separation difficulties and deterioration of flotation indexes.

The 6-time raw copper mineral itself is buoyant, but Cu ^{2+ in the} slurry is easy to activate other minerals. Secondary copper minerals have a higher degree of mud formation, are prone to oxidation, cause fine-grained loss, and increase the difficulty of flotation.

When ⑦ When ore containing talc, kaolin, sericite gangue, floating or better, or ease of mud, easily contaminated concentrate is difficult to obtain a high-quality concentrate.

3. Copper ore flotation

There are two options, priority flotation and hybrid flotation.

(1) Priority flotation

Always float copper first, then float sulfur. The collector can be used with xanthate or with black medicine. For dense massive copper-bearing pyrite, in order to suppress a large amount of pyrite during floating copper, it should be carried out in a strong alkaline medium with pH=11-12, and the free CaO in the slurry is controlled at about 700-1000 g/L. For disseminated ores with low pyrite content, copper ore flotation can be carried out at pH=8-9.

(2) Mixed flotation

Copper-sulfur mixed concentrate is usually selected from a neutral medium with a pH of about 7 to 8. The free CaO in the slurry is controlled at about 100 to 150 g/L. The copper-sulfur mixed concentrate is then separated. The separation of the mixed concentrate is a lime method, a lime plus cyanide method, and a heating method.

1 Lime method - increase the pH of the medium to make it alkaline, inhibit pyrite.

2 lime plus cyanide method - used when pyrite is more active and not easily inhibited by lime.

3 heating method - used for copper and sulfur mixed concentrates that are difficult to separate to accelerate the surface oxidation of pyrite.

The above copper-sulfur separation method can also be used for preferential flotation of copper.

4. Examples of flotation of copper ore

(1) Flotation of disseminated copper ore

Generally, a relatively simple process is adopted. After a period of grinding, the fineness-200 mesh accounts for about 50% to 70%, one rough selection, two to three times, and one or two sweeps. If the particle size of the copper mineral is relatively fine, a stage grinding process may be considered. Most of the concentrating plants that deal with the porphyry ore are re-grinding with coarse concentrates—a selective stage grinding process, which is essentially a mixing-priority flotation process. After a rough grinding, rough selection, sweeping, and then re-grinding the coarse concentrate to obtain high-grade copper concentrate and sulfur concentrate. Rough grinding fineness - 200 mesh accounts for about 45% to 50%, and regrind fineness - 200 mesh accounts for about 90% to 95%.

(2) Flotation of dense copper ore

Dense copper ore Due to the dense symbiosis of chalcopyrite and pyrite, pyrite is often activated by secondary copper minerals. The content of pyrite is high, it is difficult to suppress, and sorting is difficult. Copper concentrate and sulfur concentrate are required to be obtained simultaneously during the sorting process. The tailings usually selected after copper are sulfur concentrates. If the gangue content in the ore exceeds 20% to 25%, it is necessary to sort again to obtain the concentrate. For the treatment of dense copper ore, two-stage grinding or stage grinding is often used, and the fineness of grinding is required to be fine. The dosage of the drug is also relatively large, and the yellow drug dosage is 100 g/(t ore) or more, and the lime is 8 to 10 kg (t ore).

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