Mining of Mineral Deposits

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Using a combined electromagnetic conversion method to determine iron ore characteristics

Volodymyr Morkun1, Natalia Morkun1, Tetiana Oliinyk2, Svitlana Hryshchenko3

1Bayreuth University, Bayreuth, Germany

2Kryvyi Rih National University, Kryvyi Rih, Ukraine

3State Tax University, Irpin, Ukraine


Min. miner. depos. 2025, 19(4):22-30


https://doi.org/10.33271/mining19.04.022

Full text (PDF)


      ABSTRACT

      Purpose. Determination of characteristic parameters of electromagnetic eddy current conversion for the recognition of mineralogical varieties of iron ore.

      Methods. The work uses methods of analysis of domestic and foreign experience, mathematical analysis, and computer modeling to determine the influence of specific physicochemical properties and textural and structural features of iron-bearing rocks on the characteristics of eddy current conversion of a probing electromagnetic signal. To determine the frequency of the probing signal at which the real and imaginary components of the impedance of the sensor’s measuring coil are equal to each other, it is approximated using a Foster network.

      Findings. Variations in the electrical conductivity and magnetic permeability of iron ore, associated with its mineralogical composition and physical structure, lead to changes in the conditions of formation and flow of eddy currents, which is reflected in the phase, amplitude, and spectral composition of the signal in the receiving circuit of the eddy current sensor. The measured impedance values of the sensor’s measuring coil characterize the unique properties of the rock sample under study and, together with the frequency value of the probing electromagnetic signal, are a characteristic feature of the mineralogical variety of rock.

      Originality. It has been established for the first time that the values of the real and imaginary components of the impedance of the measuring coil and the frequency at which they are equal to each other, determined by the results of eddy current conversion in a ferromagnetic medium of a probing electromagnetic signal of variable frequency, correspond to the unique physicochemical properties of the mineralogical varieties of the iron-bearing rock under study and are effective characteristic features for their recognition.

      Practical implications. The dependencies obtained as a result of modeling eddy current conversion are used in the implementation of the method of non-contact non-destructive measurement of iron ore characteristics and recognition of its mine-ralogical varieties. The results of testing and practical application of the proposed method demonstrate its high efficiency, which allows us to recommend the developed scientific and technical solutions for wide industrial application in mining enterprises.

      Keywords: eddy current transformation, rock modeling, characterization, measurement of characteristics


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