| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for enhancing a volatilization rate of lead in steel dust without making the burning temperature higher than a normal burning temperature, even if the steel dust is a difficult material to be treated, when reduction-burning the steel dust in a rotary kiln. <P>SOLUTION: In a process of reduction-burning the steel dust of the difficult material to be treated containing zinc and lead, by adding a carbonaceous reducing agent to the steel dust to evaporate and recover zinc and lead, and further recovering iron as the residue, this reduction-burning method includes the steps of: adding iron oxide containing chlorine to the steel dust; mixing them and granulating the mixture to produce a pellet which has a chlorine grade of 3.5 to 4.5 wt.% and the iron grade of 20 to 30 wt.%; adding a carbonaceous reducing agent to the obtained pellet; and reduction-burning them. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
