| Description |
vi, 47 leaves : illustrations ; 28 cm |
| Summary |
"There is no satisfactory method of concentrating the finely disseminated oxide ores of zinc. Gravity methods of concentrating such ores may be used for coarsely crystalline materials in which the zinc material is free at approximately 10- to 35-mesh or coarser. In addition, gravity methods of concentration do not give a satisfactory separation on those ores in which the gangue mineral is small. As a result there is need for a method of beneficiating various deposits of oxidized zinc ores. The two commercially important oxidized zinc minerals under consideration are smithsonite, the zinc carbonate and hemimorphite, frequently referred to as calamine, the silicate of zinc. Deposits of the oxide minerals are numerous but unless the ore is selectively mined or amenable to concentration by hand picking or gravity methods, it has not been possible to produce concentrate of a satisfactory grade and recovery. The combined factors led to the selection of this subject as a research problem. The object of the present investigation has been to investigate various reagents and conditions in an attempt to produce, by flotation, concentrates of satisfactory grade and recovery from some oxidized zinc ores of Missouri. Since the selling price of zinc silicates and zinc carbonate concentrates is based on a zinc content of 40 percent the goal of this investigation was to produce a concentrate of at least 40 percent zinc at a maximum recovery"--Introduction, leaf 1. |
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