Find the total number of steps in the following used during the extraction of spelter from zinc blende: Poling, Electrorefining, Roasting, Froth floatation method, Smelting, Magnetic separation.

Spelter contains mainly Cu and Zn (impure zinc) Froth floatation, Roasting, and Smelting.

By first roasting, the zinc, zinc blende is made of zinc. During roasting, a reduction process is conducted in the presence of carbon, which results in the creation of zinc-containing free metal.
Because zinc blende is a sulfide ore, it is concentrated by froth flotation (ZnS)
The process of turning zinc concentrates (ore containing zinc) into pure zinc is known as zinc smelting.