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Information Circular
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Minerals & Materials
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Postdisaster Survival and Rescue Research
These proceedings consist of papers presented at a Bureau of Mines technology transfer seminar on post disaster survival and rescue research: (1) an overview of oxygen self-rescuer technology, (2) laboratory environmental testing of chemical oxygen self-rescuers for ruggedness and reliability, (3) chemical oxygen self-contained self-rescuer escape study, (4) medium frequency radio communication system for mine rescue, (5) finding and communicating with trapped miners, (6) Bureau of Mines borehole probes program, and (7) mine personnel locator and in-mine activity controller. Several technology transfer seminars are held each year to bring the latest results of Bureau research to the attention of the mining industry as quickly as possible. (Out of print.).
Cobalt and Nickel Removal from Zinc Sulfate Electrolyte by Solvent Extraction and Precipitation Techniques
Sphalerite concentrates prepared during processing of Missouri lead ores contain small percentages of cobalt and nickel which adversely affect zinc electrolysis. The Bureau of Mines has evaluated solvent extraction and precipitation techniques to remove and recover cobalt and nickel from zinc sulfate solution prior to zinc electrolysis. Prepared zinc sulfate solutions containing about 190 gpl of zinc and 50 ppm of both cobalt and nickel were treated using various combinations of complexing reagents, solvent, pH, concentration, time, and temperature. The following complex reagents gave the best results a-nitroso-ßnaphthol, ß-nitrosos-a-napthol, 1,2 cyclohexane dione dioxime (nioxime), di-2-pyridyl ketone oxime, and dimethglyoxime. These reagents in suitable solvents lowered the cobalt and nickel levels to
