1. Shenzhen Entry-Exit Inspection and Quarantine Bureau, Shenzhen 518067, China 2. Fangchenggang Entry-Exit Inspection and Quarantine Bureau, Fangchenggang 538001, China
Abstract：The iron-containing materials have extensive sources and complicated components, and include the solid wastes those are restricted in China or prohibited to be imported. During the import of iron-containing materials, the use of shoddy or mixing of wastes is possibly conducted for some unscrupulous traders. The properties of these materials are hardly distinguished only from iron content and appearance. The characteristics and sources of iron-containing materials from different regions were analyzed in experiments to find out the identification method of solid wastes in imported iron-containing materials. This method mainly included five steps as follows: (1) the investigation of sample appearance characters, including color, state, hand feeling, magnet adsorption or not, and microscope observation; (2) the analysis of physicochemical composition, including X-ray fluorescence spectrometry (XRF), X-ray diffraction (XRD) and other necessary tests, to obtain the elemental composition and content information of sample as well as the composition and content of phases in sample; (3) the literature review, i.e., the possible resource and process of sample were analyzed via relevant literatures, survey and expert consultation based on the sample information obtained above; (4) the confirmation of sample source, i.e., the source of sample was deduced and confirmed based on the investigation, analysis and verification above; (5) the discrimination of solid waste property of sample, i.e., whether the sample belonged to solid waste or not was judged according to the <Identification standards for solid wastes: General rules> (tentative). If the sample belonged to solid waste, the restriction category could be given according to <Imported waste management directory>. Based on the identification steps above, the iron-containing dust slime, leaching residue, abrasive dust and tailings were identified. The results indicated that these samples were solid wastes those were prohibited to be imported at present in China.
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