method and device for utilization of metallurgical slag in blast furnace slag

摘要

Slag sand and slag wool are formed by a method wherein molten slag is poured at a temperature above 1300 DEG C. in a thin flowing stream onto a vaned drum rotating at a peripheral speed of at least 25 m/sec. This drum, which may have forwardly directed nozzles for mixing the falling slag stream with a cooling medium such as water, breaks the slag up into droplets and projects these droplets through the air so they cool and form filaments and granules. The granules are collected separately from the filaments so that the installation simultaneously produces slag sand and slag wool.