Journals →  Non-ferrous Metals →  2014 →  #1 →  Back

HEAVY NON-FERROUS METALS
ArticleName Conversion of nickel sulfates into hidroxide (II)
ArticleAuthor Bakirov A. R., Nizov V. A., Katyshev S. F.
ArticleAuthorData

Ural Federal University named after the first President of Russia B. N. Yeltsin, Ekaterinburg, Russia:

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 Nonorganic Substances’ Technology

Abstract

There was researched the conversion of nickel-ammonium sulfate to nickel (II) hydroxide. Periodical and uninterrupted methods were used for realization of conversion. Periodical method was realized in apparatus with blending machine, while uninterrupted method was realized in pulsator column. The target product was washed in ascending flow with varied hydrodynamic mode. Wipping of nickel hydroxide was carried out on laboratory vacuum filter at constant rarefaction. Nickel (II) hydroxide was dried in convective furnace with electromagnetic microwaved frequency field. Three modifications of nickel (II) hydroxide (two crystalline and one pseudo-amorphous) can be formed during the conversion process. The shape of nickel hydroxide is determined by the excess of precipitant and process temperature. Usage of the precipitant with concentration of less than 1.25 mol/l leads to formation of “spherical” nickel (II) hydroxide. Crystalline phase is mostly formed in the time of increasing of concentration of precipitant by more then 2.5 mol/l. With the precipitant concentration from 1.25 to 2.5 mol/l, the shape of nickel (II) hydroxide grains has a transition structure from spherical to crystalline shape and is mostly shown by scale-layered structure. Yield of crystalline phases mostly depends on precipitant temperature and rarely depends on the method of synthesis. Crystalline shapes of nickel hydroxide are characterized by lesser value of total specific surface and are released from the solution with lesser content of water phase. As a result of realization of developed technical methods, the total period of obtaining of nickel (II) hydroxide can be decreased by more than a half.

keywords Сrystalline nickel (II) hydroxide, spherical nickel (II) hydroxide, conversion, hexahydrate nickel-ammonium sulfate, pulsator column, fractioning, filtration, microwave drying
References

1. Dasoyan M. A. Khimicheskie istochniki toka. Vtoroe izdanie, pererabotannoe i dopolnennoe (Chemical sources of current. Second edition, revised and enlarged). Leningrad : Energiya, 1969. 588 p.
2. Rutshteyn V. E., Gorskaya L. N. Sposob polucheniya nikelya (II) gidroksida (Method of nickel (II) hydroxide obtaining). Patent RF, No. 2138447, MPK 6 С 01 G 53/04. Applied: May 26, 1998. Published: September 27, 1999.
3. Gellershteyn I. R., Klementev M. V. Sposob izgotovleniya gidrata zakisi nikelya dlya akkumulyatornoy promyshlennosti (Method of obtaining of nickelous hydroxide for accumulator industry). Patent RF, No. 2178931, MPK 7 H 01 M 4/26, H 01 M 4/52. Applied: November 08, 2000. Published: January 27, 2002.
4. Volynskiy V. V. et al. Elektrokhimicheskaya energetika – Electrochemical energetics. 2006. Vol. 6, No. 3. pp. 150–156.
5. Stepin B. D. et al. Metody polucheniya osobo chistykh neorganicheskikh veshchestv (Methods of obtaining of high purity nonorganic substances). Leningrad : Khimiya, 1969. 480 p.
6. Chalyy V. P. Gidrookisi metallov (Metal hydroxides). Kiev : Naukova Dumka, 1972. 154 p.
7. Sviridov V. M., Sviridov A. V. Sposob polucheniya gidroksida nikelya (II) (Approach of obtaining of nickel (II) hydroxide). Patent RF, No. 2208585, MPK 6 С 01 G 53/04. Applied: March 11, 2002. Published: July 20, 2003.
8. Nikolskiy B. P., Grigorov O. N., Pozin M. E. Spravochnik khimika. Tom 2. Trete izdanie, ispravlennoe (Chemist`s reference book. Volume 2. Third edition, corrected). Leningrad : Khimiya, 1971. 1168 p.
9. GOST 4465-74. Reaktivy. Nikel (II) sernokislyy semivodnyy. Tekhnicheskie usloviya. Vveden: 01 Yanvarya 1975 (State Standard 4465-74. Reagents. Heptahydrate nickel sulfate (II). Technical conditions. Introduced: January 01, 1975). Moscow : Russian State Standard : Standards` Publishing House, 1974. 11 p.
10. Karpacheva S. M., Ryabchikov B. E. Pulsatsionnaya apparatura v khimicheskoy tekhnologii (Pulsation apparatuses in chemical technology). Moscow : Chemistry, 1983. 224 p.

Language of full-text english
Full content Buy
Back