Method of roasting material containing at least one of V, Mo and Ni and rotary kiln for roasting the same
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United States of America Patent
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Mar 20, 2012
Grant Date -
May 21, 2009
app pub date -
Feb 21, 2006
filing date -
Oct 5, 2005
priority date (Note) -
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Abstract
Provided is a roasting method capable of reducing both C and S components in minerals down to 0.5% or less, respectively, and securing a yield ratio of 90% or more for the Mo component. In a rotary kiln 7, a V, Mo and Ni containing material containing C and S components is subjected to oxidizing roasting to remove the C and S components from the material before reducing the material by means of a reducing agent in order to recover valuable metals composed of V, Mo and Ni. The rotary kiln is equipped with a burner 11 disposed on a material charge side 8a of the roasting furnace 8 to which the material is charged. In the roasting furnace, a direction along which the material moves and a flow of oxygen-containing gas introduced into the roasting furnace 8 are set to be parallel with each other.
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