The results of studies on the precipitation of arsenic sulfide (III) from multi-component 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 As2 S3) 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 600 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 As2 S3 precipitation rate becomes higher, and the rate of oxidation of sulfide ions to elemental sulfur by iron (III) ions changes insignificantly, which, in turn, en-ables 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). © 2023, Ore and Metals Publishing house. All rights reserved.
Translated title of the contributionPurification of arsenic-containing nitric acid solutions using sodium hydrosulfide in the presence of oxidizing agents
Original languageRussian
Pages (from-to)34-40
Number of pages7
JournalTsvetnye Metally
Issue number7
Publication statusPublished - 31 Jul 2023

    ASJC Scopus subject areas

  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Ceramics and Composites
  • Physical and Theoretical Chemistry
  • Condensed Matter Physics

    Level of Research Output

  • VAK List

ID: 43606755