Pacific National University, Khabarovsk, Russia

E. M. Doroshenko, Postgraduate Student, Higher School of Industrial Engineering, e-mail: dorekami@yandex.ru

Pacific National University, Khabarovsk, Russia¹ : Khabarovsk Federal Research Center, Khabarovsk, Russia²
A. V. Rasskazova, Associate Professor, Higher School of Industrial Engineering¹, Leading Researcher², Candidate of Technical Sciences, e-mail: annbot87@mail.ru

The problem of reducing the arsenic content in concentrates of tin-containing ores is relevant. The article considers different approaches to solving this problem, including: standard beneficiation methods, roasting with the conversion of arsenic compounds into volatile forms, autoclave oxidation and sublimation processes. In order to reduce the arsenic concentration in the tin ore concentrate, ferric chloride was used as an oxidizer to implement its leaching into the productive solution. Electron microscopy, chemical and X-ray fluorescence analysis were used to study the material composition of the original ore and concentrates. The possibility of hydrometallurgical finishing of tin ore concentrate to reduce the arsenic content was investigated. The effect of the leaching solution composition at different temperatures (23 and 80 ^оС) and mixing intensity was studied. The concentrate with the highest arsenic concentration was taken for the experiments. The introduction of a combination of oxidizers (ferric iron and sodium nitrate) turned out to be the most effective. Increasing the temperature of the reaction system from 23 to 80 ^оС increases the efficiency of the arsenic leaching process into the liquid phase. The maximum achieved concentration of arsenic in the productive solution is 1180 ppm (1 ppm = 10^–6) (at a temperature of 80 ^оС). Further research at higher concentrations of oxidizers in the solution, with an increase in the duration of the process and at other temperature conditions seems relevant.

The studies were conducted at the Applied Materials Science Collective Use Center of the FSBEI HE PNU with the financial support of the Ministry of Science and Education of the Russian Federation within the R&D framework of the state assignment No. FEME-2024-0006 Theoretical and technological substantiation of activation effects in beneficiation and hydrometallurgical processes for processing polycomponent mineral raw materials.

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