Experiments dealing with the dielectric separation of mineral grains indicate that the best results may be obtained by using ordinary 60-cycle alternating current stepped up to 880 volts. Furfural and benzene, mixed in varying proportions, supply the most satisfactory media. Grains of a given mineral may be separated quite effectively from others that have a distinctly higher or lower dielectric constant. The dielectric constants of 38 minerals determined in the above media are tabulated.

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