Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1979-04-23
1981-03-17
Halper, Robert
Classifying, separating, and assorting solids
Fluid suspension
Liquid
B03D 102
Patent
active
042562279
ABSTRACT:
Froth flotation method for recovering copper, nickel, silver, mercury, bismuth, and lead values from their ores by applying thiourea or any substituted thiourea in conjunction with hydrochloric, nitric, sulfuric, phosphoric, oxalic, hexacyanoferric (II), thiocyanic, or cyanic acids to obtain pure copper, nickel, silver, mercury, bismuth, and lead concentrates, which comprises; adding to a water suspension of finely divided ore of thiourea, or substituted thiourea, and an adequate amount of the above said acids, and especially for recovering of copper minerals the addition comprises hydrochloric, nitric at a pH 6.5, sulfuric, phosphoric, oxalic, hexacyanoferric (II), cyanic at a pH 7.0 of the mineral slurry; for recovering nickel minerals, thiocyanic acid, i.e., potassium thiocyanate in a neutral pulp of mineral slurry; for recovering silver mineral or native silver, hydrochloric, nitric, or oxalic acid in a slightly acid pulp of mineral slurry at a pH 6-6.5; for recovering mercury minerals hydrochloric or nitric acid, or potassium thiocyanate at a pH 7.0 of the mineral slurry; for recovering bismuth minerals or native bismuth, hydrochloric or nitric acid in a slightly alkaline pulp of mineral slurry at a pH 8.0, by adding sodium hydroxide, ammonia, or alkyl amine, and adding a small amount of sodium chloride; for recovering of lead minerals, nitric acid at a pH 6.5, or potassium thiocyanate in a neutral pulp of mineral slurry, which acting in conjunction activate and levitate in the froth developed by an usual frother and by usual froth flotation procedure the metal values of copper, nickel, silver, mercury, bismuth, and lead minerals are recovered from respective mineral slurries of unaffected gangue minerals as froth concentrates.
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Handbook of Chem. & Physics, 31st Edition, 1949, pp. 412, 413, 510, 511, 512, 513.
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