Federal State Autonomous Educational Institution of Higher Professional Education «Ural Federal University named after the first President of Russia B.N.Yeltsin»

A. R. Bakirov, Post Graduate Student, e-mail: bakirov.al@yandex.ru

V. A. Nizov, Assistant Professor

S. F. Katyshev, Professor, Head of a Chair of Technology of Non-organic Substances

Conversion of nickel-ammonium sulfate to hydroxide (II) was studied. To realize it two methods were used: periodical and uninterrupted. Periodical one was done in an apparatus with blender and uninterrupted one was performed in a pulsating column. The target product was washed in an ascending flow with a varied hydrodynamic regime. Nickel hydroxide was wringed on a laboratory vacuum filter at a constant rarefaction. Drying of nickel hydroxide was done in a convective stove with putting electro-magnetic field of microwaved frequency. It is shown that three modifications of nickel (II) hydroxide can be formed during the conversion process: two crystalline and one pseudo-amorphous. The form of nickel hydroxide is determined by the excess of the precipitant and the temperature of the process. The usage of the precipitant with concentration less 1.25 mol/l leads to formation of “spherical” nickel hydroxide. With concentration more 2.5 mol/l crystalline phase is formed. At the precipitant concentration from 1.25 to 2.5 mol/l the shape of nickel (II) hydroxide particles has a transition structure from “spherical” shape to “crystalline” and represented mainly by a scale-layered structure. The appearance of crystalline phases depends much on temperature of precipitant and very little from the method of synthesis. Cristalline forms of nickel hydroxide are characterized by lower total specific area and are produced from the solutions with lower water content. As a result of developed technical contrivances the total time required for production of nickel (II) hydroxide can be decreased by more than a half.

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