An inflatable PFD has less bulk and interference than a foam unit, but is ready to provide flotation during an unexpected entry into the water.
可膨胀的PFD有较少的体积和没有了干扰泡沫单位,但在想不到的进入水后实时提供漂浮。
2
In technology, four process schemes, such as crude ore cyanide leaching, flotation -cyanide leaching of flotation concentrate, fractional bulkflotation and selective flotation, were put forward.
The defect of sampling methods of bulkflotation zinc concentrates in the real application is expounded. Meanwhile, improvement methods is put forward and it is a good effect.