科研之友
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摘要
The occurrence state of the critical metal cobalt is one of the core issues in the study of critical metal mineralization. Due to the small grain size of the cobalt -bearing minerals, it is difficult to determine the types, contents, grain sizes, distribution characteristics and symbiotic relationships with other ore minerals and vein minerals of key metal minerals at the deposit scale. Therefore, there is an urgent need to establish a low-cost and efficient research process for the occurrence state of cobalt. In this study, taking the Longqiao iron deposit as an example, a new sampling and sample preparation process was established to improve the representativeness of the samples and significantly reduce the time required for sample pre-treatment and preparation. Through comprehensive mineral analysis using the Time -of-Flight Ion Microprobe Analysis (TIMA) technique, the content of minerals in three types of ore samples with different cobalt contents was determined. A total of 753 cobalt minerals, including skutterudite, arsenopyrite, cobalt -bearing pyrite and cobalt -bearing chalcopyrite, were identified in six experimental ore samples. Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy ( SEM-EDS) was used to verify and semi -quantitatively analyze the cobalt minerals. Finally, in situ spot analysis of magnetite and pyrrhotite was conducted using Laser Ablation -Inductively Coupled Plasma Mass Spectrometry ( LA-ICP-MS) on the same resin target to further determine the occurrence state of cobalt in the samples. This study has established a research method and technical process for the occurrence state of key metal cobalt in ore, which has many advantages, such as simple and convenient sample preparation, short analysis time, low analysis cost and high analysis accuracy. It provides reliable technical support for the study of the spatial distribution patterns and occurrence states of key metals at the deposit scale.
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