Preparation of nano-iron oxide red pigment powders by use of cyanided tailings
Cyanided tailings had been used to prepared nano-iron oxide red pigment powders by using homogenous precipitation method 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 iron and the impurity of it was removed by use of additives. Then, the precursor of 4α-FeOOH was obtained, when the pure liquid reacted with ammonia liquid at the selected experimental conditions. At last, high pure nano-iron oxide red pigment powders were obtained. The structure, size and morphology of crystal seed and iron oxide red were characterized systematically by means of XRD, TEM and LPSA (Laser Particle Size Analyzer). The results revealed that typical iron oxide nanoparticles were α-Fe<,2>O<,3> with particle size of 50-70nm. Furthermore, the parameters that affect the hue and quality of the crystal seed and iron oxide red pigment were also discussed.
Nano-iron oxide red Cyanided tailings Nitric acid Recycle
Deng-xin Li Guo-long Gao Fan-ling Meng Chong Ji
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
国际会议
北京
英文
48-55
2007-08-20（万方平台首次上网日期，不代表论文的发表时间）