Hyperspectral magnetite grade based on characteristic band screening inversion study.

From the analysis of the changes in the spectral curves of different grades of magnetite, it can be seen that the spectral reflectance of magnetite shows a decreasing trend in the range of 400–520 nm, and gradually increases in the range of 520–620 nm, and forms a weak valley near 520 nm, which is due to the formation of the weak absorption characteristics of Fe 3+ ; in the range of 620–2100 nm, the changes in the spectral reflectance of magnetite are smaller, but the spectral reflectance of different grades of magnetite is lower than 0.45 17 , 18 .

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