Khabarovsk Federal Research Center (Khabarovsk, Russia)

A. V. Rasskazova, PhD (Eng.), Leading Researcher, annbot87@mail.ru

Pacific National University (Khabarovsk, Russia)

E. M. Doroshenko, Postgraduate Student of the Higher School of Engineering at Pacific National University, email: dorekami@yandex.ru

Since the reduction of reserves of non-ferrous metal ores with low content of impurities, such as arsenic, the metallurgical industry is faced with the need to process concentrates, where the arsenic content exceeds the standard indicators. Material composition of rough tin concentrate was determined by methods of chemical and mineralogical analysis, and granulometric analysis was carried out using a laser particle analyzer. Sulfuric acid leaching with the use of oxidizers was studied as a method of dearsenization: iron (III) and a combination of iron (III) and sodium nitrate. The process was carried out at a temperature of 80 °C and a S/L ratio of 1/10, the leaching duration was 5 hours. Comparative studies of the efficiency of arsenopyrite leaching with and without ultrasonic treatment (40 kHz, 180 W) were carried out. In the conducted study, the variable factors are: the type of reagent leaching system, the duration of leaching (0.5-5 h), the presence or absence of ultrasonic treatment; the controlled parameters are: temperature (80±0.5°C), the S:L ratio (1:10). The results of sulfuric acid leaching of arsenic from rough tin concentrate using iron(III) and nitrate anion as a combination of oxidizing agents are presented. Using ultrasonic intensification of the arsenopyrite leaching process, 66.07 % of the arsenic was recovered into the solution. The arsenic content in the concentrate is reduced to 2.67 %. In the absence of ultrasonic intensification, the arsenic extraction into the solution was 2.64 %. The use of ultrasound and a combination of oxidizers in sulfuric acid leaching of arsenopyrite demonstrates the potential of the hydrometallurgical method for industrial processing of arsenic-containing concentrates.

Technological and analytical studies were carried out using the resources of the Center for Collective Use "Center for the Study of Mineral Raw Materials" of the Khabarovsk Federal Research Center of the Far Eastern Branch of the Russian Academy of Sciences, funded by the Russian Federation represented by the Ministry of Science and Higher Education of Russia under agreement No. 075-15-2025-621. The research was conducted with the financial support of the Ministry of Science and Education of the Russian Federation within the framework of the State Assignment No. FEME-2024-0006 "Theoretical and technological substantiation of activation effects in beneficiation and hydrometallurgical processes of processing polycomponent mineral raw materials."

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