ガーニエライト鉱の選択還元焙焼における鉱物変化の影響について

ラテライト鉱の石炭含有ペレット法による還元焙焼に関する研究 (第2報)

抄録

Selective reductive roasting have been conducted for garnieriticores by using a coal-containing pellet method. Influences of various fundamental factors were investigated on the reduction rateof nickel and the selective metallization of nickel againstiron, and the relation between these behaviors and the change of minerals contained in garnieritic ores during heating was discussed. Some results obtained are as follows.
Reduction rate for the nickel component in garnieritic ores was very low compared with that in limonitic ores. It was considered that the nickel oxide contained in garnieritic ores was a component of clay minerals such as serpentine, and the heating caused a change of these minerals to the silicate contained magnesia (forsterization), resulting in a decrease in the reduction rate of nickel above 800°C.
To improve the reduction rate of nickel in garnieritic ores, the addition of sulfur was effective for the coal-containing pellet method as well. It was considered that the addition of sulfur was effective for increasing the reductive power of atmosphere and decreasing the number of metallic nickel particles enclosed in the forsterite.