Flotation of non-ferrous metals from pyrite-arsenic pyrite ore abroad

Pyrite and arsenopyrite ore symbiosis, which contain dispersed non-ferrous metal sulfide, precious metals and rare metals containing both, at the fine grinding conditions, using the amino acid collector, direct flotation method, a Recycle these metals.

A more suitable method is to first sort the mixed concentrate of the sulfide mineral under the condition of coarse grinding, and then mix the concentrate and re-grind to carry out the separation flotation of the non-ferrous metal sulfide.

Re-grinding pyrite and arsenic pyrite concentrate with a fineness of -0.044 mm and adding a fixed amount of sodium salt (NaCl, Na ₂ SO ₄ , Na ₂ under liquid: solid = 3:1) CO ₃ ), stirring was carried out, and then 300 g/ton of sodium anthranilate was added in a concentrate to carry out flotation.

Table 1 Mixed concentrate flotation test results

As can be seen from the table, sodium ortho-aminobenzoate is a highly selective collector for the separation of non-ferrous metal sulfides from the mixed concentrate of pyrite.

In the presence of a collector, the addition of an electrolyte (NaCl, Na ₂ SO ₄ ) or the like will affect the yield of the concentrate.

Under the condition of no collector, the flotation of non-ferrous metal sulfides in the electrolyte solution was always unsatisfactory. In the separation flotation concentrate, the recovery rates of copper and silver were 6.9% and 6.2%, respectively.

It is also not enough to use only one amino acid collector to float the fine-grained sulfide minerals of these metals, and the recovery rate is only 12% to 12.5%.

In this case, the effect of the combination of the selective collector and the low concentration electrolyte solution (0.1 eq/L or less) on the flotation index must be studied, as the prior test has identified that high concentrations of salt in the slurry phase hinder The attachment of the amino acid collector to the surface of the selected mineral.

Reducing the initial concentration of the electrolyte to 0.05 gram equivalents per liter causes a decrease in the recovery of non-ferrous metal sulfides in the foam product.

The main copper-bearing mineral - chalcopyrite, in sodium carbonate solution, has a floating ability even without a collector, while in sodium sulfate and sodium chloride solution, no collector can not float. The main sulfide minerals - pyrite and arsenopyrite, do not float in Na ₂ SO ₄ and NaCl solutions even at the corresponding saturation concentrations; in Na ₂ CO ₃ solution, only These minerals float in a concentrated solution close to saturation.

The use of these properties promotes the better separation of pyrite, arsenopyrite and non-ferrous metal minerals during flotation.

The hydrophobic interaction of the collector and the coordination of the electrolyte solution can only separate the dissociated non-ferrous sulfide minerals from pyrite and arsenopyrite. At the same time, the grade and recovery of non-ferrous metals in foam products depends on the extent of mineral dissociation.

Thus, in this case, the recovery of silver and copper selected from the arsenic pyrite and pyrite concentrate is 40.5% to 44%. A finished copper concentrate with a grade of more than 26% can be obtained from the pyrite concentrate.

It can be seen that in the flotation process, the combined use of selective collector and electrolyte solution can improve the recovery of non-ferrous metals in the separation flotation concentrate, and can remove a small amount of non-ferrous metals and precious metals from pyrite and arsenic. The pyrite is sorted out from the main ore.

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