Preparation of nano-iron oxide red pigment powders by use of cyanided tailings

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• 作者：Li Dengxin ; Gao Guolong ; Meng Fanling ; Ji Chong
• 关键词：Nano-iron oxide red ; Pigment ; Cyanided tailings ; Nitric acid ; Recycle
• 刊名：Journal of Hazardous Materials
• 出版年：2008
• 出版时间：30 June 2008
• 年：2008
• 卷：155
• 期：1-2
• 页码：369-377
• 全文大小：681 K

文摘

On one hand, cyanided tailings are one kind of pollutants. On the other hand, they contain a lot of valuable elements. So utilization of them can bring social and environmental benefits. In this paper, cyanided tailings were used to prepare nano-iron oxide red pigment powders by an ammonia process with urea as precipitant. At first, cyanided tailings were oxidized by nitric acid. Then, the oxidizing mixture was separated into solid and liquid parts. The liquid mixture was reduced by scrap iron and the impurity of it was removed by use of NH₃·H₂O. Then, the seed crystal of γ-FeOOH was obtained, when the pure liquid reacted with ammonia liquid at the selected experimental conditions. At last, nano-iron oxide red pigment powders were prepared. The structure, morphology and size distribution of seed crystal and iron oxide red were characterized systematically by means of X-ray diffraction (XRD), transmission electron microscope (TEM) and laser particle size analyzer (LPSA). The results revealed that typical iron oxide nanoparticles were -Fe₂O₃ with particle size of 50–70 nm. Furthermore, the factors that affected the hue and quality of the seed crystal and iron oxide red pigment were also discussed.