발간논문

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It seems to us that the soluble starch, gum arabic are strong modifier of carbonate minerals such as dolomite limestone rhodochrosite etc. Therefore, Rhodochrosite ore which contain limestone is almost impossible to separate each other by soap flotation. But in the case of apatite ore which is associated with dolomite or gangue mineral, we can effectively separate each other by using soluble starch, Gum arabic as modifier. We can obtain the result having the concentrate of 32.6 to 34.79 percent P₂O_5 under 80 to 87.79 percent recovery from 5 to 12 percent P₂O_5 original ore containing much dolomite as gangue mineral, by using soluble starch or Gum arabic as modifier of the dolomite. The most of suitable conditions of the soap flotation of the apatite are as follows; ore size...100 mesh pulp concentration...20% solid starch 800 g/ton or Gum-arabic...400 g/t sodium maleate...200 to 250 g/t Na₂CO₃...2,000 / PH...9 to 10 pulp temperature...24 to 25℃ flotation time...20 minutes

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The concentration of Bi-wet dross is a questionable problem in order to recover Bismuth metal from Bi-dross produced in the debismuthizing process. We could concentrated this Bi-dross up to 50% of Bismuth by cupellation, then oxidized the lead selectively. This is a reverse utilization of the principle that Bismuth metal in lead is not eliminated by oxidation. So we could produced high grade and salable Bismuth metal by using the Chlorination method which not only eliminated the traces of lead, but zinc and other impurities as well in addition to cupellation.

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