calciner

The calciner was developed from metal-ore purification apparatus.

These are whisked to the third receptacle, called a calciner.

Brunton’s calciner, used in the “burning” of the pyritic minerals associated with tin ore, is a familiar example of this type.

In some processes of lead-smelting, where the minerals treated contain sand, the long calciner is provided with a melting bottom close to the fire-place, so that the desulphurized ore leaves the furnace as a glassy slag or silicate, which is subsequently reduced to the metallic state by fusion with fluxes in blast furnaces.

It is obtained commercially by roasting arsenical pyrites in either a Brunton’s or Oxland’s rotatory calciner, the crude product being collected in suitable condensing chambers, and afterwards refined by resublimation, usually in reverberatory furnaces, the foreign matter being deposited in a long flue leading to the condensing chambers.