Abstract
Comprehensive development of mineral resources is one of the main objectives of a state. An important role for its solution is the import substitution of expensive сolombian coals used in the production of industrial silicon, with shubarkol coals having similar characteristics. One of the main geological tasks is to study the distribution of iron oxide in coals, which affects to the technology of ore-thermal production of silicon. Researches have shown that expensive chemical analyzes of iron oxide, with high accuracy, do not allow them to be used promptly when forming a batch of coal at the enterprise. To solve the urgent task of an express assessment of the content of iron oxide in coal we have been developed a method and device that implements the induction principle of measuring the magnetic characteristics of coal. The method is based on the transition of the oxide of two-valence iron into a complex oxide of trivalent during ashing. The discrepancy between the measurement results according to the Kazakhstan state standard GOST 10538–87 and the developed method is within the permissible range of this standard. The device is being used at Shubarkol Komir JSC Company. It received certificate of metrological certification No. 9912 and is authorized as a measurement instrument in the Republic of Kazakhstan.