Low-alkalinity flotation separation method for pyrite activated by Cu2+ and chalcocite

Abstract

The invention discloses a low-alkalinity flotation separation method for pyrite activated by Cu2+ and chalcocite. The method comprises the steps that lime is firstly added in the ore grinding stage so as to keep low alkalinity, a composition of citric acid, sodium sulfite and pyrogallic acid is added as a composite inhibitor in the rougher flotation stage to inhibit the pyrite, copper rougher flotation is achieved under the condition of low alkalinity, then a dispersing agent is added for concentration, inhibition on gangue minerals is intensified, and copper concentrates are obtained. Compared with the traditional manner of inhibiting sulfur through lime, the inhibition effect of the composite inhibitor on the pyrite activated by Cu2+ is remarkable, wherein citric acid is used for removing the activation action of Cu2+ on the pyrite, so that natural floatability of the pyrite is restored, the inhibition effect on the pyrite is intensified through sodium sulfite and pyrogallic acid, meanwhile, the phenomenon of trough moving caused by foam viscosity is eliminated, and the index of the mineral processing technology is improved; and in addition, due to the fact that the flotation pH value is lowered, recycling of associated gold in ore is facilitated.

Description

technical field [0001] The invention relates to a low-grade copper ore beneficiation technology, in particular to a Cu 2+ Low-alkalinity flotation separation method of activated pyrite and chalcocite, this method is especially suitable for high sulfur content in ore, part of chalcocite is oxidized, pyrite is oxidized by Cu 2+ Low-grade secondary copper sulfide ores that are activated and difficult to separate copper and sulfur. Background technique [0002] The types of copper deposits with mining value in my country include magmatic copper-nickel sulfide deposits, porphyry copper deposits and sedimentary layered deposits, etc., and the copper grades of these deposits are relatively low. At present, many domestic mining grades are 0.4% to 0.5%, and the cut-off grade of individual large-scale open-pit mines is even reduced to 0.2%. It is imminent to improve the comprehensive utilization rate of copper ore resources and carry out research on the separation technology of low-...

AI Technical Summary

Problems solved by technology

Copper sulfide ore is mainly treated by flotation. Copper-sulfur separation is the key stage. The traditional copper-sulfur separation process is "mixed flotation-coarse concentrate regrinding" and "high alkalinity sulfur suppression floating copper". The former process is long. , and the regrinding operation increases the grinding cost; the latter usually needs to add a large amount of lime, resulting in serious stickiness of the flotation foam, and the flotation operation is prone to "slot running" phenomenon, and because chalcocite is easily oxidized, after oxidation Formed Cu 2+ Activate the pyrite. At this time, the lime can no longer effectively inhibit the pyrite, which affects the flotation effect, and the high lime dosage is not conducive to the recovery of the associated gold of the copper concentrate.

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