Norddeutsche Affinerie Aktiengesellschaft

Werner Marnette

Gerhard Berndt

Uwe-Jens Hansen

A process and apparatus for granulating slag in which molten slag is charged into a drum and is solidified and granulated therein on cooled surfaces. To ensure a rapid cooling at a high thruput rate, the molten slag is applied to the inside surface of a drum, which rotates on a horizontal axis and has a cooled shell, and the solidified film of slag is mechanically detached from the inside surface after about three-quarters of a revolution of the drum and is discharged.

Process and apparatus for granulating molten slag

A method for the continuous pyrometallurgical processing of copper-lead matte having a high lead content relative to copper. In order to ensure an economical and ecologically satisfactory processing, the following steps are performed in a continuous sequence: (a) In one processing stage a suitable atmosphere is provided and temperatures above 1250.degree. C. and a high turbulence are maintained in a molten bath, volatile lead components are incorporated in a fine dust and liquid matte having a decreased lead content and metallic lead included in a copper-containing lead alloy are produced; (b) in another processing stage, gases which contain free oxygen are blown into or onto the liquid matte which has been produced in stage (a) and is at a temperature above 1250.degree. C. whereby a high-oxygen converter slag and a converter copper containing less than 1% by weight lead are produced and volatilizable impurities contained in the matte are incorporated in a fine dust; and (c) in a third processing stage the converter copper, which contains less than 1% by weight Pb and other impurities, such as Ni, As, Sb, is refined in that a gas which contains free oxygen is blown into or onto the molten bath. The impurities are slagged by a selective oxidation, and a prerefined copper is formed.

Growing community of inventors

Hollenstedt, Germany

Werner Marnette