Title:
METHOD FOR REFINING CRUDE LEAD
Document Type and Number:
Japanese Patent JP2009299118
Kind Code:
A
Abstract:
To provide a method for refining crude lead, which greatly shortens an operating period of time compared to a conventional method and saves energy.
This refining method includes: heating and melting the crude lead which has been produced in a blast furnace employing an ISP process and contains copper as impurities, at a heating rate of 0.8 to 1.3C/min; keeping a temperature of the molten metal in a range of 350 to 410C throughout the subsequent step, simultaneously stirring the molten metal with a stirring power of 2.0 to 2.2 kW/m3, and thereby bringing air into contact with the impurities including copper to form dross; and separating and collecting the dross from the molten metal. Thus refined lead has a copper grade of 0.1% or less.
Inventors:
INOUE HIROSHI
KUDO KAZUO
TSUCHIOKA KAZUHIKO
KUDO KAZUO
TSUCHIOKA KAZUHIKO
Application Number:
JP2008153751A
Publication Date:
December 24, 2009
Filing Date:
June 12, 2008
Export Citation:
Assignee:
SUMITOMO METAL MINING CO
International Classes:
C22B13/06
Attorney, Agent or Firm:
Kameda Tetsuaki