The Magnetic Characteristics of Pyrrhotite

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  • 磁硫鉄鉱の磁性に関する2, 3の問題について
  • ジリュウテッコウ ノ ジセイ ニ カンスル 2 , 3 ノ モンダイ ニ ツイテ

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Abstract

The author separated many kinds of pyrrhotite in Japan by Franz isodynamic separator, and studied some magnetic characteristics of them. The main results are as follows:<BR>1) From the magnetic distribution curve obtained by isodynamic separation, two types are found. One is strongly magnetic of mono-peak type, and the other is weakly magnetic of di-peak type.<BR>2) It is shown by the results of isodynamic separation on the samples from two deposits at Akagane mine, that one gives mono-peak curve, and the other gives di-peak curve. It is also considered that magnetic distribution on the samples from the same deposit have similar tendencies.<BR>3) Most of the mono-peak type pyrrhotite are found in fissure filling deposit and most of di-peak ones occurr in metasomatic deposit. It means that magnetic property of pyrrhotite relates to its crystallization temperature.<BR>4) As regard to thermo-magnetic curve of pyrrhotite, three types are found. One is of Weiss type, the second is of the peak type having a peak at 220-230°C, and the third is of the flat type which is independent of temperature.<BR>5) The thermo-remanent magnetism of pyrrhotite is very strong, i. e. ten cr twenty times stronger than its natural magnetism.<BR>Using the above character, weakly magnetic pyrrhotite can be recovered 90% by magnetic separation (800 Gauss) after it was heated at 300°C for half an hour.

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