Abstract
From the results obtained from the sintering and volatilising experiments, the following conclusions may be stated:
(1) Under oxidizing atmosphere the ferro-manganese ores from Kemaman are not melted at 1, 250°C, while under reducing atmosphere, they are melted in heating at that temperature for a while with addition of carbonaceous fuels.
(2) The ores are sintered well in heating at 1, 200°C with or without addition of carbonaceous fuels.
(3) The elimination of lead and zinc by volatilisation and the strength of sintered ores increase according to the increase of anthracite added.
(4) In general lead is easily eliminated by volatilisation, but that of zinc is comparatively difficult.
(5) On roasting at 1, 100°C for 2 hours with addition of 5% anthracite the eliminating rates of lead and zinc run up to 98·7% and 82·5% respectively and then the contents of lead and zinc in the sintered ores are decreased to 0·1%. Pb and 0·4% Zn respectively.
(6) On roasting at 1, 100°C and 1, 200°C respectively with addition of 5% anthracite and 5% BaCO3, the eliminating rates of lead and zinc both run up to 91·0-96·5% and the contents of lead aud zinc are both decreased to 0·1-0·2%,
(7) To eliminate lead and zinc contained in the ferro-manganese ores by volatilisation in practice, the ores should be roased in a long rotary kiln with addition of at least more 5% powdered anthracite or coke, so that the carbonaceous fuels added may be completely burnt until they reach the discharging end of the kiln, where they should be sintered at 1, 200°-1, 250°C under oxidizing atmosphere.
