Method for processing steelmaking dust, method for producing zinc, method for producing iron- and steelmaking raw material, and raw material of iron and steel

A method for producing zinc, comprising:

• adding a calcium compound containing Ca to steelmaking dust containing zinc, the number of moles of Ca being equivalent to or more than the number of moles of Fe in the steelmaking dust,
• heating and reducing, in a furnace, the steelmaking dust to which the calcium compound has been added, without generating melt, and
• recovering a zinc component therefrom.

A method for producing an iron- and steelmaking raw material, which separates zinc from steelmaking dust to recover zinc as the iron- and steelmaking raw material, the method comprising:

• adding a calcium compound containing Ca to steelmaking dust containing zinc, the number of moles of Ca being equivalent to or more than the number of moles of Fe in the steelmaking dust,
• heating and reducing, in a furnace, the steelmaking dust to which the calcium compound has been added, without generating melt, and
• separating zinc from the steelmaking dust.

A raw material of iron and steel, comprising:

• zinc whose amount is not more than 0.1% by weight;
• and
• dicalcium ferrite (2CaO.Fe2O3) whose amount (% by weight) is large and iron (II) oxide (FeO) whose amount (% by weight) is small.