風化花闇岩の乾式解砕
風化花崗岩の乾式選鉱に関する基礎的研究 (第1報)
1980 年 96 巻 1108 号 p. 397-402
詳細
1980 年 96 巻 1108 号 p. 397-402
To investigate the possibility of effective disintegration of weathered granite in dry system, the continuous disintegration tester was newly designed. The tumbler tester was also used as disintegrator for comparison to the result from the disintegration tester. The results obtained are as follows:
1) From the results of particle size distribution of treated samples and mineral composition of the product under 74μm, the following optimum disintegration conditions for both testers were determined.
The designed tester: Feed rate=5.7kg/min. Height of outlet=80cm. Impeller speed=100 rpm.
Tumbler tester: Amount of feed=10kg/batch. Total number of revolution=400 (16.7 minutes).
2) The designed tester can disintegrate the sample continuously. In spite of increasing the weight ratio of the product under 74μm in treated sample, the mineral composition of the product in the treated sample is almost same as that in the untreated sample.
3) In the present experiment, seven samples were examined. Especially, highly weathered sample from Iizuka-shi, Fukuoka-ken gave the silica sand with rather high quality in coaser part and the clay with almost same quality as the decanted one in finer part (-37μm)
