Abstract
The standard method of testing iron ores, due to its high labor intensity and low representativeness, cannot serve as a basis for controlling the quality of ores in the process of their extraction and processing. The proposed spectrometric modification of the gamma-albedo method makes it possible to exclude labor-intensive operations for grinding ores, preparing analytical samples (~0.1 mm) and directly chemical analysis for iron. Studies of the spectral distribution of the scattered gamma radiation of the radioisotope source Se-75 (~220 keV) on ores with different iron content revealed critical energies and zones of their displacement depending on the quality of the ore and the energy of the scattered gamma radiation. The found critical energies in the spectral distribution of the albedo of gamma radiation made it possible to choose the optimal energy intervals in the hard (above the critical energy) and soft (below the critical energy) regions of the spectrum in terms of the maximum contrast ratio Ψ of the scattered gamma radiation intensities measured in the selected energy intervals, with a change in the concentration of iron. In the process of testing the proposed modification of the method for monitoring the iron content in partially prepared samples weighing ~ 60 kg, with a particle size of 40 mm, a root-mean-square error of 1.32% abs was achieved.
Published Version
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