Problem Laboratory MMC Norilsk Nickel

A. G. Kitay, Senior Research Officer
V. A. Bryukvin, Head of Laboratory, ph.: (499) 135- 87-30

A. O. Bolshikh, Principal Engineer
V. A. Korneev, Senior Researcher

MMC Norilsk Nickel

V. T. Dyachenko, Chief of Scientific and Technical Direction

Degree of hydrolysis of ferrous (III) sulphate and also iron and sulphur contents in residuals and its phase and granulometric content have been determined on model solutions of iron ferro-sulphate under the conditions of its autoclave oxidation. Changeable parameters was: temperature (100–200 ^oC) and content of basic iron (II) sulphate in solution (~10 and 40 g/l). Partial pressure of oxygen is 1 MPa, duration is 1 hour. By obtained results it has been determined that hematite has been stable formed in hydrolysis process in temperatures interval, equals to 180–200 ^oC, under the conditions of temperature as 120–160 ^oC gothite has been formed. Temperature raising in process of Fe (II) oxidation and iron (III) sulphate hydrolysis lead to reducing of iron content in settling and degree of hydrolysis. With 200 ^oC sulphur content in settling was ~1%, iron was 62%, raising of iron (II) content in basic solution was since ~10 until 40 g/l leads to forming more fine particles in settling. With 200 ^oC, average size of settling particles, obtained from solutions, which contained ~10 g/l of Fe (II) was 14.4 μm, and from solutions, contained ~40 g/l of Fe (II) was 1.7 μm.

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