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flotation machine for copper lead nickel cobalt

flotation machine for copper lead nickel cobalt

and sodium cyanide, 0.10 lb/st. All but the frother were added to the ball mill; the frother was added down the cell bank as needed. The grind was targeted at a minimum of 50 wt pct passing 10µm. Prior tests indicated that the siegenite should be sufficiently liberated at this point to give satisfactory rougher recovery.

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During the short duration tests, it was discovered that some of the chalcopyrite was of such a refractory nature that additional collection would be needed. Both Minerac B and Z 200 proved effective in floating this more refractory fraction of chalcopyrite. The Z 200 was chosen because it was available on site. The flotation flowsheet developed from these short duration tests is compared in figure 5 to the classic rougher scavenger cleaner configuration. For lack of a better term, this flowsheet was dubbed successive cleaning. Table 3 shows the results of laboratory cleaning of rougher concentrates produced from a short duration test. Two successive flotation tests were done in the laboratory at bench scale on a rougher concentrate, and the data from each tailing assay were combined into a hypothetical cobalt product. In each test, recoveries approached or exceeded 80 pct and the grades exceeded 3.5 wt pct Co on a starting grade of 0.5 wt pct Co. This flotation flowsheet appeare...

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Extended roughing tests were run to optimize the initial flotation step in order to maximize cobalt grade. These were continuous tests, run around the clock, usually of 3 days to 1 week in duration. Tables 4 and 5 list some typical conditions and data from one of these series of extended tests. Results were evaluated in 8 h periods numbered from one to nine. The objective was to remove 30 to 50 wt pct of the cobalt at as high a grade as possible and leave the successive steps to make a high recovery. As can be seen from table 5, tests 2, 4, 5, and 9 met these standards. One very interesting result from these tests was a correlation between the nonchalcopyrite iron fraction of the feed and the lead grade of the cobalt product. Earlier work had indicated that there was a relationship between the amount of marcasite pyrite present in the ore and the extent of galena oxidation. It was also noted that the marcasite was the particularly unstable component. This marc...

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To run the extended roughing tests with cleaning, some modifications to the continuous test unit were necessary. A large agitation tank was used to hold rougher concentrate, until it was later refloated using a launder configuration that divided the six cells into two sets of three. The tailings from these two steps were added together with the original rougher tailings to form a cobalt product. Tables 6 and 7 list the parameters and summarize the results of a typical test.

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Figure 7 plots cobalt improvement ratios versus mean particle size for the successive cleaning tests. The improvement ratios show an upward trend with diminishing particle size in the rougher stage but the line is virtually flat for the cleaning stages. This could indicate either a lack of liberation of the siegenite or entrainment of the siegenite in the froth. Scanning electron microscope studies tended to confirm the idea that the liberation of the siegenite from the chalcopyrite was incomplete. These data are summarized in table 8. The first series of these studies was done in an attempt to determine the degree of liberation of the siegenite from the chalcopyrite. The samples of flotation test unit products were searched for nickel by using X ray mapping. When nickel was found the area was then remapped for cobalt and copper. The occurrence of cobalt and nickel without the copper would indicate a free siegenite particle. Indications were that the siegenite particles were n...

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The copper concentrate is exposed to as many as seven separate reagents prior to cobalt separation. Several methods of reagent removal had been tried previously with little success. These included steaming, Na2S addition, and oxidation with H2O2 and ozone. It was postulated that attritioning or scrubbing with a ceramic medium might produce a cleaner, more responsive mineral surface with which to work. With this in mind, a series of laboratory tests were initiated to evaluate the effect of attritioning. Bench testing was done with an opposed impeller scrubber with glass and ceramic media of sizes ranging from 500 to 3,000 µm for 2 h. Table 9 lists sizing data from cyclosizer tests of the attritioned products. For comparison, a typical float cell feed prepared by closed circuit grinding had the distribution in table 10. Using the attrition mechanism for primary grinding was ruled out because of energy considerations but it was determined that a scrubber improved flotation results. In...

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The final series of tests involved configuring the continuous test unit to obtain engineering data for the flowsheet and parameters developed from the prior tests. In order to be as realistic as possible, the feed for this series of tests was filtered copper concentrate taken from Magmonts storage pad. It was felt that this offered the worst case for feed material and would best simulate the feed of any future circuit to recover cobalt. The concentrate was reslurried in an agitated tank at approximately 60 pct solids. A peristaltic pump was used to feed the slurry to the ball mill sump at approximately 0.16 gal/min . From the sump, the combined feed and ball mill overflow was pumped to the 3 in cyclone with the underflow going to the mill and the overflow back to the divided ball mill sump. The overflow then fed by gravity to the attrition machine and from there to the float cells. This setup resulted in a heavy recycling of undersize through the cyclone, giving, in eff...

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