別子鉱山における優先浮選方式の改善について
1955 年 71 巻 807 号 p. 515-522
詳細
1955 年 71 巻 807 号 p. 515-522
In the beneficiation of Besshi ores, bulk-differential flotation system had formerly beer adopted. However in October last year a new process, called by us “Bulk-Stage Differential Flotation”, was developed in our mill to better our results.
In this newly contrived method slaked lime and sodium cyanide are added to bulk concentrate before it undergoes regrinding in order to depress the middlling copper and pyrite. And the chalcopyrite isolated by first grinding is first floated and reclaimed by the first-stage flotation process. Then the sink undergoes regrinding in order to have its middling copper liberated, after which chalcopyrite is reclaimed by the secondary flotaiton process.
The resultant grade of the copper concentrate is 20-22% Cu, and that of the pyrite concentrate is 0.21-0.25% Cu. In this way satis factory results by far better than that of the bulk differential flotation method have been achieved.
