Preparation of nano-iron oxide red pigment powders by use of cyanided tailings.
Preparation of nano-iron oxide red pigment powders by use of cyanided tailings.
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DOI：
10.1016/j.jhazmat.2007.11.070
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发表时间：
2008-06
影响因子：
13.6
通讯作者：
Dengxin Li;Guolong Gao;Fanling Meng;J. Chong
中科院分区：
文献类型：
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作者：
Dengxin Li;Guolong Gao;Fanling Meng;J. Chong
一方面，氰化尾渣是一种污染物。另一方面，它们包含了很多有价值的元素。因此，对它们的利用可以带来社会效益和环境效益。以氰化尾渣为原料，采用尿素为沉淀剂，采用氨法制备纳米氧化铁红颜料。首先用硝酸氧化氰化尾渣。然后，将氧化混合物分离成固体和液体部分。混合液用铁屑还原，用氨水除杂。然后，在选定的实验条件下，将纯液与氨水反应，得到γ-FeOOH晶种。最后制备了纳米氧化铁红颜料粉体。采用X射线衍射仪（XRD）、透射电子显微镜（TEM）和激光粒度分析仪（LPSA）对晶种和氧化铁红的结构、形态和粒度分布进行了系统表征。结果表明，典型的氧化铁纳米粒子为α-Fe2O3，粒径为50-70 nm。并对影响晶种和氧化铁红颜料色相和质量的因素进行了讨论。
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 α-Fe2O3with particle size of 50–70nm. Furthermore, the factors that affected the hue and quality of the seed crystal and iron oxide red pigment were also discussed.