There are two options for the separation of copper- molybdenum mixed concentrate: one is copper-suppressing molybdenum, which is the most important method of mineral processing . The second is to suppress molybdenum floating copper. The latter method was adopted by only a few selection plants and inhibited molybdenite with dextrin.
Inhibitors for the separation of copper and molybdenum from molybdenum and copper are:
(1) sodium sulfide method;
(2) sodium sulfide + steam heating method;
(3) a single cyanide method;
(4) cyanide + sodium sulfide method;
(5) Knox Pharmacy (or its combination with sodium cyanide);
(6) ferricyanide and ferrocyanide method;
(7) sodium hypochlorite or hydrogen peroxide method;
(8) Organic inhibitor method such as thioethanol.
Copper-molybdenum separation: Sodium sulfide, cyanide, arsenic or phosphonox is effective in inhibiting copper minerals mainly composed of chalcopyrite and porphyrite; ammonium sulfide, ferricyanide and ferrocyanide, oxidant, secondary Chlorate and hydrogen peroxide are more effective in inhibiting secondary copper sulfide minerals. Organic inhibitors such as mercaptoethanol are newly developed non-toxic and highly effective molybdenum inhibitors of molybdenum and are being promoted. The measures commonly used to improve the separation of copper and molybdenum are:
(1) Concentrated drug removal. Before the separation of the concentrate, the concentrate is removed and the excess agent entering the mixed concentrate is removed to ensure that the stirring and rough selection are carried out at a suitable concentration.
(2) Steam heating. Some copper and molybdenum plants abroad have steamed copper-molybdenum mixed concentrates (85-90 °C) before copper-molybdenum separation, and sometimes added appropriate amount of lime (0.8-1.2 kg/t concentrate) to drum in oxygen or air. . The purpose is to destroy the collector film on the surface of the mixed concentrate by desorption and decomposition. In many countries, the sodium sulfide + heating (steaming) method is considered as the best solution for the separation of copper and molybdenum concentrate. This method is to use a sulfide to suppress copper minerals and directly heat the steam along the flotation line. (60 ~ 75 ° C) pulp, which not only accelerates the desorption and decomposition of the collector, but also slows the oxidation of sulfides, greatly reducing the amount of sulfides and improving the separation index.
(3) Add sodium sulfide in stages. Sodium sulfide is the most commonly used copper-molybdenum separation method, it is possible to suppress all non-molybdenum-gold metal sulfide minerals, a large amount fluctuation range, can fluctuate within 2 ~ 30kg / t. Sodium sulphide is advantageously added in stages, often adding a portion of the sodium sulphide solution to the stirred tank, while another portion of the sodium sulphide is placed in a solid form in the rough and selected foam tanks, using the heat generated by the dissolution of the sodium sulphide. The temperature of the pulp rises to enhance its inhibition.
(4) Flotation with nitrogen. Inhibitors used in copper-molybdenum separation flotation, such as sodium sulfide, sodium sulfite, sodium sulfide in Knox's agent or phosphorus pentasulfide, are easily oxidized and lose their inhibitory effect. Due to the copper-molybdenum separation cycle, the number of selections is large (6-8 times), and the line length is long. These agents are more prominent due to oxidation. In order to avoid oxidation and reduce the dosage of the chemical, the copper-molybdenum selection plant uses nitrogen instead of air as the aeration medium to obtain a significant economic effect of the copper-molybdenum separation flotation, which can reduce the dosage of Knox by 50% to 70%.
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