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NOBLE METALS AND ITS ALLOYS
Название Purification of arsenic-containing nitric acid solutions using sodium hydrosulfide in the presence of oxidizing agents
DOI 10.17580/tsm.2023.07.04
Автор Karimov K. A., Dizer O. A., Kuzas E. A., Rogozhnikov D. A.
Информация об авторе

Ural Federal University named after the first President of Russia B. N. Yeltsin, Scientific Laboratory of Advanced Technologies for Complex Processing of Mineral and Technogenic Raw Materials of Nonferrous and Ferrous Metals, Yekaterinburg, Russia:

K. A. Karimov, Senior Researcher, Candidate of Technical Sciences, e-mail: kirill_karimov07@mail.ru
O. A. Dizer, Researcher, Candidate of Technical Sciences

D. A. Rogozhnikov, Head of Laboratory, Doctor of Technical Sciences

 

Research Center “Hydrometallurgy”, St. Petersburg, Russia:
E. A. Kuzas, Head of Research and Technology Department, Candidate of Technical Sciences

Реферат

The results of studies on the precipitation of arsenic sulfide (III) from multicomponent solutions of nitric acid leaching of refractory sulfide raw materials of non-ferrous metals containing iron (III) ions, using sodium hydrosulfide as a precipitant, are presented. The effect of temperature, pH solution, NaHS consumption, and seed (arsenic sulfide As2S3) on this process was studied. The highest degree of precipitation of arsenic sulfide (III) (95–99%) from nitric acid solutions containing iron (III) ions without seeding occurs at pH from 1.8 to 2.0 and the NaHS/As molar ratio = 2.8. An increase in temperature leads to a significant decrease in the degree of precipitation of arsenic sulfide (III). With an increase in temperature from 25 to 60 °C, the degree of arsenic transition to the precipitate decreases almost by half for the entire studied range of pH = 1–2. This is due to an increase in the degree of oxidation of the sulfide ion by iron (III) ions to elemental sulfur, which is also confirmed by a decrease in the Fetot/Fe2+ ratio in solution to 1.05–1.01. The introduction of the seed significantly improves the precipitation of arsenic sulfide (III). Increasing the seed consumption from 0 to 34 g/dm3 solution increases the degree of arsenic transfer to the precipitate from 36.2 to 98.1% at pH = 1. The addition of the seed probably accelerates the crystallization of arsenic sulfide (III) by increasing the number of crystallization centers, as a result of which the As2S3 precipitation rate becomes higher, and the rate of oxidation of sulfide ions to elemental sulfur by iron (III) ions changes insignificantly, which, in turn, enables to reduce the molar flow rate of NaHS/As to 2.25 and to obtain the precipitate with a lower amount of elemental sulfur and a high content of arsenic.

The study was carried out within the framework of the Russian Science Foundation project No. 22-79-10290. Analytical studies were carried out with the financial support of the State Task of the Russian Federation under Grant No. 075-03-2021-051/5 (FEUZ-2021-0017).

Ключевые слова Arsenic, trisulfide, precipitation, nitric acid leaching, sodium hydrosulfide, mathematical model, multicomponent solutions, iron (III)
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