| 摘要 |
<p>730,827. Matte processes; distilling zinc and lead. BERZELIUS METALLHUTTON-GES. April 2, 1953 [April 3, 1952; Dec. 30, 1952], No. 9265/53. Class 82 (1). [Also in Group XII] In a process for producing copper or lead mattes in a rotary furnace, the furnace walls are cooled by coils carrying a cooling fluid and secured to the inner wall of the furnace. The coils become covered with a protective layer of solidified slag, and allow the temperature at the discharge end of the furnace to be maintained in the preferred temperature range 1100-1400‹ C. As shown, a rotary furnace 1 is heated by a coal-dust burner 3 and fed with matte-forming materials at 2. Cooling coils 5 disposed on the furnace wall are supplied with cooling fluid at 11. Slag leaves the furnace over the edge of an annular baffle 7, and matte through an opening 9. Volatilized metals such as zinc and lead may be recovered from the gases leaving at 10.</p> |
