Joint magnetic flotation sorting method for complex magnetic pyrite copper-containing pyrite ore

Abstract

The invention relates to a joint magnetic flotation sorting method for complex magnetic pyrite copper-containing pyrite ore, which comprises the following steps: primary ore grinding, prior floating copper, re-grinding for de-reagent, magnetic separation desulfurization iron from copper rough concentrates, copper selection from magnetic tailings and pyrite selection. A part of single square magnetic pyrites which have stronger magnetism and play a great role in copper selection interference is separated from the prior floating copper rough concentrates by the adoption of a magnetic method so as to reduce the interference to the copper selection process, and when the prior floating copper is roughly selected, iron pyrite is inhibited in low-alkali mediums by the adoption of lime and DB-5 combined inhibitors, so that the consumption of the lime is reduced, and the iron pyrite can be efficiently collected without the use of activators in the subsequent process flow of selecting pyrite from prior floating copper tailings; and by the adoption of the joint magnetic flotation sorting method, the grade of copper is larger than 18 percent and the recovery rate is larger than 74 percent in the copper concentrates; and the grade of sulfur is larger than 40 percent and the recovery rate is larger than 86 percent in pyrite concentrates.

Description

Technical field [0001] The present invention belongs to the field of mineral selection technology, involving a complicated mines in copper -sulfur and iron ore containing complicated magnetic pyrite, which specializes in a copper sulfur ore ore containing complex magnetic yellow iron ore with priority floating copper and magnetic selection.Mining method. Background technique [0002] For the sorting process of copper sulfur minerals, the key is how to achieve the problem of efficient recovery of copper minerals and the problem of effective suppression or exclusion of iron sulfide minerals.When the sulfide ore minerals in the ore are both pyrite (FES 2 ), And magnetic pyrine (Fe 1-x S), especially due to the uneven magnetic and floating resistance of magnetic yellow iron ore, it has a great effect on the sulfur sorting effect.In previous practice, the amount of inhibitors of sulfur ore was increased to ensure the copper concentrate index, but this method brought difficulties to th...

AI Technical Summary

Problems solved by technology

However, it is more difficult to activate pyrrhotite after such a high alkali suppression, especially for pyrrhotite ores with complex crystal structure types, because some Fe in pyrrhotite 2+ Ions are covered by Fe 3+ ions instead, in order to maintain the balance of electricity prices, iron atom vacancies appear

With Fe 3+ The increase of ions and the number of vacancies (x value) determine that pyrrhotite has monoclinic, hexagonal, and polymorphic variants that exist in the ore to be sorted at the same time. This change in crystal chemical properties makes pyrrhotite magnetic and floatability are uneven, and it is difficult to effectively eliminate the interference of pyrrhotite in a changing state on the floating copper process under a single separation condition or separation method, thereby seriously affecting the recovery rate of pyrite, making A large amount of pyrite is lost in the abandoned tailings, which not only causes a huge waste of resources, but also seriously pollutes the environment with sulfur-containing waste

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