JSC “Chepetsky Mechanical Plant”, Glazov, Udmurt Republic, Russia

A. A. Talanov, Leading Engineer of the Central Scientific and Research Laboratory, е-mail: taalek@rambler.ru

E. V. Ilenko, Head of the Central Scientific and Research Laboratory
R. T. Abashev, Master of the Calcium Production

JSC “Leading Scientific-Research Institute of Chemical Technology”, Moscow, Russia

M. L. Kotsar, Head of Laboratory
V. N. Kaplenkov, Leading Researcher

Metal calcium and its alloys are used as reducing agents for obtaining а number of radioactive and rare metals. Each of consumers puts forward specific requirements to the chemical composition and to the particle-size distribution of this material. One of prospective materials for metallo-thermic processes is calcium granules derived from a melt. The results of mastering a method for the granulation of metal calcium from a melt in conditions of calcium manufacture in JSC “Chepetsky Mechanical Plant” are summarized. Engineering solutions directed towards the elimination of deviations from the normal course of the process, revealed during tests of the equipment are described. It is shown that the reason of depressurization of the pipeline for melt is interaction of the calcium melt of with steel St3ps (Ст3пс) at 860–900 ^оС. After performance of recommendations on replacement of the material of the tube by steel 20, decrease in pressure difference between the melter and the chamber for granulation and restriction of the resource of exploitation of the metal pipeline to 30 melts this deviation has been eliminated. It is also noted that the granules obtained had unsteady fractional composition because of an increase in the sizes of perforation holes of the loading container as a result of wear and tear of its material as a result of interaction of the material of the disperser (steel St3ps (Ст3пс)) with the calcium melt at 860–900 ^оС. Replacement of the material of the loading container by steel 5ХНМ increased the resource of exploitation of the container from 2–4 to 10 cycles of granulation. It is shown that an increase in the diameter of the chamber from 2.8 to 4.2 m allows to raise the yield of calcium to granules at the production of grained alloy calcium–aluminium (11.0% Al) from 81.5 up to 96.8% because of an increase in the flying time of drops. Besides, alloys of calcium with nickel, magnesium and lead have been produced. An engineering design for the elimination of pyroeffect during unsealing of the installation is presented. Due to changes in the installation design of allowing to eliminate the formation of inflammable sublimates of calcium it became possible to increase the mass of calcium loading from 240 to 900 kg.

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