The use of copper sulphide

1. Activation of sodium sulfide

One non-ferrous metal oxide ore flotation process, is to use mineral surface Na2S after vulcanization, with a xanthate flotation.

Malachite green and white lead ore colorless and transparent dark surface color, or even black, described sulfide mineral surface generated film, and has a certain thickness, can xanthate collector.

The role and concentration of sodium sulfide, mixing time, pulp pH and slurry temperature are closely related. If the amount is too small, it is not enough to make the minerals sufficiently vulcanized; if the amount is too large, it will cause inhibition. In order to avoid excessive pH, in order to avoid excessive pH, NaHS may be used instead of Na ₂ S or FeSO ₄ and H ₂ SO ₄ may be appropriately added during vulcanization. The vulcanization time is long, and the sulfide film formed on the mineral surface is thick, which is favorable for flotation. However, if the time is too long, Na ₂ S will decompose and fail, and strong cracking will cause the vulcanized film to fall off, so it should be avoided.

    Second, the inhibition of sodium sulfide

(1) When sodium sulphide is inhibited by sodium sulfide, the optimum pH is 7-11 (the most effective is about 9.5). At this time, the HS ^- concentration is the largest, and the HS ^-- the side excretes the xanthate adsorbed on the surface of the galena. It itself adsorbs on the mineral surface, making the mineral surface hydrophilic.

(2) When the amount of sodium sulfide is large, most of the sulfide ore will be inhibited. Sodium sulfide inhibition descending order of sulfide ore is roughly: galena, sphalerite, yellow copper ore, bornite, blue copper, pyrite, chalcocite.

(3) Sodium sulfide is easily oxidized in the slurry. Its concentration is not easy to control, and the inhibition of minerals is often time-dependent. Therefore, single sodium sulfide is rarely used as a selective inhibitor of sulfide minerals. At present, sodium sulfide is mainly used for the following three aspects when it is suppressed:

1. Deodorization of polymetallic sulfide ore mixed gold ore;

2. Suppressing chalcopyrite and other minerals with sodium sulfide when copper- molybdenum is separated;

3. Separation of copper-lead mixed concentrate. Sodium sulfide combined with sulfurous acid inhibits galena flotation of chalcopyrite. This method has been replaced by heavy chromate method.