ガーニエライト鉱より析出するニッケルのセグリゲーション機構について
1971 年 87 巻 995 号 p. 103-108
詳細
1971 年 87 巻 995 号 p. 103-108
This paper presents the reducing mechanism of recovering nickel from garnierite ores by the Segregation-Magnetic Separation Process from both side for viewpoints viz. chemical reactions and physical phenomena.
By segregation roasting, metallic nickel as well as iron and cobalt are reduced in two ways of direct reduction in situ and of turning steps combining chlorination, volatilization and hydrogen reduction of these vapors.
The ratio of the earned metal amounts by two ways depend on the operating conditions including temperature, retention time and blended reagents, such as reductants, water vapor and mixed chlorides.
For optimum segregation, garnierite ores calcined at about 900°C are in preference to raw ores, by reason of higher speed chlorination rate compared with a lower speed of direct reduction at the processing temperature range from 950°C to 1000°C.
Physical phenomena, for example, formation of some fused mixed chlorides, vaporization bf them, mineralizing effects of vapor and melts, adsorption of chloride vapors upon carbon, metels, alloys or gangue preferentially, formation of metallic whiskers and growth of them, were studied by XMA and an electron beam scanning microscope refered to the segregated particles after separation by means of magnetic concentration method.
