風化花崗岩に含まれる雲母鉱物の2, 3の選鉱特性
1975 年 91 巻 1047 号 p. 341-346
詳細
1975 年 91 巻 1047 号 p. 341-346
The authors have investigated the difference in specific gravity, magnetic separability and floatability of micas containedi n the samples which are made from various kind and weathering degree of granitic rocks through attrition, grinding and sieving. The reaults obtained are summarized as follows;
(1) As weathering proceeds, biotite changes into chrolite, hydrobiotite, vermiculite, kaoline, gibbsite etc., remainning its appearance, and same time its specific gravity decreases. So it becomes difficult to separate mica from quartz and feldspar by “Sink and Float Separation”.
(2) As biotite is weathered, the density of magnetic flux necessary for attraction of it becomes higher. Muscovite is less affected by weathering and it needs higher density of magnetic flux than biotite
(3) Since there are many factors which affect the result of mica flotation, the degree of weathering could not be related strictly to the difficulty of flotation. However, it was found that the finer and thinner particles of mica are, the easier it is to float, and, comparing mica in froth with that in tailing, the latter has been altered than the former.
(4) It was easy to perform the mica flotation rather satisfactorily on the samples made from the so called “Masa-tsuchi” of muscovite-granite and biotite-granite, but was not so easy on all weathered products of granodiorite.
