National Mineral Resources University, Saint Petersburg, Russia

V. I. Bolobov, Professor of the Mechanical Engineering Chair, e-mail: Boloboff@mail.ru

Scientific and Research Center “Hydrometallurgy” LLC, Saint Petersburg, Russia

Ya. M. Shneerson, Chief Executive Officer, Professor
A. Yu. Lapin, Technical Director
G. A. Bitkov, Researcher

In conditions simulating operation of autoclave equipment oxidation of pyrite gold concentrates (~3% aqueous solution of H₂SO₄ including, and in the presence of chloride ion), at 130 ^оC and an oxygen pressure of 1.0 MPa using a gravimetric -metric method analyzes the corrosion behavior of 3 foreign brands steels of different alloying systems (304L — of Cr – Ni, 2205 — of Cr – Ni – Mo, 904 L — of Cr – Ni – Mo – Cu), as well as Cr – Ni – Mo – Nb-alloy Inconel 625. According to test results de-barking the conclusion that all the tested materials have high corrosion resistance in the gas, oxygen-phase: the value of corrosion losses P does not exceed 0.1 mm/year and is located at a P similar alloys in pure oxygen. Similar high resistance have tested steel and alloy in the liquid phase of the working environment. However, their resistance point (I) significantly higher than that (II–V), established for the corrosion of these materials in a pure solution of sulfuric acid at low temperatures. This difference in the behavior of alloys authors explain pulp oxygen saturation, to give it the oxidizing properties, which preserves a passive state of metals. In this case, the introduction of the Cl^– at 100 mg/L did not appreciably affect the rate of corrosion of materials in the gas phase. In the case of the liquid phase, the rate of corrosion of the alloy Inconel 625 and Cr – Ni – Mo – Cu-steel 904L with the introduction of Cl^– remains unchanged, slightly enhanced for Cr – Ni – Mo-composition (steel 2205) and increases by 4 orders of magnitude with complete destruction of the samples for steel 304L, alloy only Cr and Ni.

1. Shneerson Ya. M., Chugaev L. V., Pleshkov M. A. Tsvetnye Metally – Non-ferrous metals. 2011. No. 3. pp. 62–67.
2. Naboychenko S. S., Ni L. P., Shneerson Ya. M., Kalashnikova M. I., Chugaev L. V. Avtoklavnaya gidrometallurgiya tsvetnykh metallov (Autoclave hydrometallurgy of nonferrous metals). Under the editorship of S. S. Naboychenko. Yekaterinburg : Ural State Technical University-Ural Polytechnical Institute, 2002. 940 p.
3. Shneerson Ya. M., Lapin A. Yu., Chugaev L. V., Bitkov G. A. Sposob pererabotki upornogo sulfidnogo zolotosoderzha shchego syrya (Processing method of hard sulphide gold-containing raw materials). Patent RF, No. 2434064. МPК С22В 11/08. Applied: July 26, 2010. Published: November 20, 2011. 9 p.
4. Lapin A. Yu., Bitkov G. A., Shneerson Ya. M. Tsvetnye Metally – Non-ferrous metals. 2011. No. 12. pp. 39–44.
5. Korroziya i zashchita khimicheskoy apparatury : spravochnoe rukovodstvo (Corrosion and protection of chemical equipment : reference guide). Tom 4. Proizvodstvo sernoy kisloty i fosfornykh udobreniy (Production of sulphuric acid and phosphorous ferlitizers). Under the editorship of A. M. Sukhotin. Leningrad : Khimiya, 1970. 272 p.
6. Klimov I. Ya. Korroziya khimicheskoy apparatury i korrozionnostoykie materialy (Corrosion of chemical equipment and corrosion resistance materials). Moscow : Mashinostroenie, 1967. 816 p.
7. Babakov A. A., Pridantsev M. V. Korrozionnostoykie stali i splavy (Corrosion resistance steels and alloys). Moscow : Metallurgiya, 1976. 320 p.
8. Shvarts G. L., Sidorkin Yu. S., Levi B. I. Osobye svoystva i korrozionnaya stoykost materialov, ispolzuemykh dlya oborudovaniya proizvodstva sernoy kisloty (Special properties and corrosion resistance of the materials, used for the production equipment of sulphuric acid). Korroziya i iznos. Vypusk 5 (Corrosion and wear. Issue 5). Moscow : Mashinostroenie, 1966. pp. 68–85.
9. Shvarts G. L., Makarova L. S., Svistunova G. V. et al. Korrozionnaya stoykost splavov na osnove nikelya v vysokoagressivnykh sredakh (Corrosion resistance of alloys on the basis of nickel in highly aggressive environments). Korroziya i iznos. Vypusk 5 (Corrosion and wear. Issue 5). Moscow : Mashinostroenie, 1966. pp. 11–21.
10. Vorobeva G. Ya. Korrozionnaya stoykost materialov v agressivnykh sredakh khimicheskikh proizvodstv (Corrosion resistance of materials in agressive environments of chemical productions). Moscow : Khimiya, 1975. 816 p.
11. Bolobov V. I., Makarov K. M. Zashchita metallov – Protection of Metals and Physical Chemistry of Surfaces. 1992. Vol. 28, No. 6. pp. 1007–1010.