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This paper demonstrates a simple environment-friendly synthesis route of iron oxide yellow (α-FeOOH) using spent pickling solutions as raw material. After abundant laboratory experiments, we finally pinned down the best procedure. The research showed that α-FeOOH nanometer material with average diameter of 50nm and average length of 400 nm was prepared at the optimal technique. And the FeOOH content of the sample was as high as 90%, which is higher than the 86% of GB/T1863-2008. The structure, morphology and size distribution of the product was characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM), Scanning electron microscope (SEM) and Malvern lazer particle analyzer, respectively. The test results show that all the indices of as-prepared iron oxide yellow are completely in conformity with and even better than national primes standard.

A simple and green hydrothermal stripping synthesis route has been successfully developed for synthesis of α-LiFeO 2 nanoparticles from the organic phase containing Fe (III) and Li (I), which was prepared by mixing Qinghai salt lake brine, industrial FeCl 3 ·6H 2 O and tributyl phosphate (TBP). The influence of synthesis conditions, such as Li/Fe molar ratio, time and temperature, on the samples was investigated, and spheroidal α-LiFeO 2 nanoparticles with diameter of about 150 nm have been synthesized at 210 °C with Li/Fe molar ratio of 30. Qinghai salt lake brine, as an important lithium resource, is supposed to be fully studied and utilized. Here, the application range of salt lake brine was expanded innovatively.