Improvements in and relating to the agglomeration of finely-divided ferruginous ores, concentrates and the like

摘要

In a process for agglomerating finely divided ferruginous ores, concentrates, &c. in which a thin layer of material is fed through a chamber and subjected in admixture with fuel to the action of air under pressure heated to about 650-800 DEG C., the ore &c. if not containing sulphur is mixed in the first place with the necessary fuel and the layer is subjected to the hot air jets over only a comparatively short length near the point of discharge. In the case or ores containing sulphur, the fuel is added only in the last zone and the air blast is applied to that zone and to a zone of limited length adjacent thereto. In the case of materials containing sulphides of arsenic, lead, zinc, &c., the process may be carried out in a rotary kiln such as that described in Specification 337,636, [Class 82 (i), Metals, Extracting &c.].