重油を燃料源とした硫酸焼鉱の塩化揮発について (第3報)

硫酸焼鉱ペレットの還元性状に関する実験的考察

抄録

The present paper describes the results of experiments on the physical properties of the sintered pellet made of pyrite cinder.
The physical properties of the pellet as a blast furnace feed have a great effect on the out-put rate of the blast furnaces. Especially, reducibility is of the most importance, and it depends on gas permeability of the pellet. Reduction tests under compressive load on the pellet in a reducing gas stream were employed as a method of permeability measurement, i. e., a extent of pressure drop of the gas stream indicates the permeability of the pellet in this case.
The test pellet were made of pyrite cinder and magnetite iron ores or lime stone. The lime stone was added to increase the basicity (CaO/SiO₂) of the pellets.
The results obtained are as follows;
(1) The extent of the pressure drop was 500mmaq in the case of regular pellets, and 50mmaq for pellets having a basicity of 1. 3, furthermore, volatility of chlorides of non-ferrous metals was accelerated by increasing basicity.
(2) The non-ferrous metal contents of the sinterd pellets were less than 0.04% for copper and 0.03% for zinc, and sulphur content was less than 0.05%. Moreover, compressive strength of the sintered pellets was more than 300kg/pellet and the porosity of the sintered pellets was less than 20%.