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Datetime:2016/7/19 22:26:09hit:10500


It is in the laundering or cleaning banks where the present polyoxyethylene glycol esters are utilized to suppress foam. In the subsequent molybdenum flotation steps sufficient copper depressants may be utilized such as alkali sulfides, cyanides, cuprocyanides, ferrocyanides, or ferricyanides. It has been found that the utilization of the present antifoams in the cleaning stages assists in reducing the amount of copper passing through to the final recovery of molybdenum sulfide, and it is for this reason that multiple cleaning or launderer stages are utilized.


In a molybdenum flotation process utilizing in the molybdenum cycle two stages of launderer, an antifoam composition consisting of 20 parts by weight P.E.G. 400 dioleate and 80 parts by weight of deoderized kerosene in a concentration of 250 ppm was introduced into each launderer stage. Visual inspection at intervals during the 30-day period showed that there was a significant reduction in foam concomitant with a more even visual surface in the launderer. Recovery downstream of molybdenite showed that the percent copper in the molybdenum flotation stage was about 1 percent through the entire period. It is noted that increasing levels of copper in the froth are indicated by an increase in a greenish tint, whereas a rich moly froth is indicated by a brighter gray luster.


In a moly sulfide cycle or circuit following the flotation of the copper values, a circuit was utilized consisting of one rougher bank, two scavenger banks, and six cleaner banks. The final product molybdenum is the froth from No. 6 cleaner. In the process, sodium hypochlorite was utilized to render the xanthate ion inactive which had been previously utilized for copper recovery and potassium ferricyanide was utilized to depress the copper in this moly cycle. Additionally, sulfuric acid was utilized for pH control and 50 ppm of polyoxyethylene 400 dilaurate was added as an antifoam in the circuit. The result was a decrease in the amount of copper recovered in the latter stages evidenced by the visual appearance of a gray color substituted for a previous greenish color in the cleaning or launderer stage of a surfeit of foam.