スズ石を含む複雑硫化鉱の選択的粉砕について

抄録

Generally the grinding of ore for mineral separation is conducted as aiming liberation. However, the ore consisting of various minerals is very difficult to grind ideally, for liberation size and grindability of composing minerals do not give always the same value. Especially it is required to avoid overgrinding of heavy minerals, e. g. cassiterite, sheelite, etc, when gravity separation is applied in the process.
On the ore composing of pyrrhotite, marmatite, galena, cassiterite, chalcopyrite, calcite and quartz, we conducted mill grinding on the laboratory scale and investigated size distribution of these minerals in the products.
The results obtained are as follows.
(1) Product with the ball milling shows a tendency that cassiterite remains at a size coarser than sulfide minerals.
(2) In the rod milling both cassiterite and sulfide minerals are ground to the almost same size.
Thus the authors recognized that the ball mill possesses more suitable character than rod mill for selective grinding of the complex sulfide ore containing cassiterite, i, e. cassiterite at coarse size and sulfide minerals at fine size.