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HEAVY NON-FERROUS METALS
ArticleName Granulation of cooper-nickel converter mattes: dispersity, microstructure and reactive capacity
ArticleAuthor Udoeva L. Yu., Selivanov E. N., Klyayn S. E., Selmenskikh N. I.
ArticleAuthorData

Institute of Metallurgy of Ural Branch of Russian Academy of Sciences, Ekaterinburg, Russia:

L. Yu. Udoeva, Senior Researcher

E. N. Selivanov, Director, e-mail: pcmlab@mail.ru

N. I. Selmenskikh, Researcher

 

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

S. E. Klyayn, Assistant Professor

Abstract

According to the flowsheet of autoclave processing of high-copper converter matte, designers of this technology offer the preliminary granulation of this intermediate product. The purpose of this work was to study the influence of method and mode of granulation on granulometric characteristics, phase composition and microstructure of particles. The test samples were manufactured from the converter matte melt, using the following methods:
— spraying of melt by water jet under the pressure;
— quenching of melt by discharging into water pool.
The melt temperature, used as indirect indicator of cooling rate, varied in the range of 1150–1300 °C. Screen fractionation and optical microscopy have shown that chemical composition and particle size of sprayed samples are sufficiently homogeneous, while quenched samples have a wide particle size distribution and high porosity. Phase composition and microstructure of samples were investigated by methods of metallography and X-ray structure microanalysis on the granules with –2.5+1.25 mm fraction. Two phases, which composition is closed to Ni3S2 and Cu1.96S, were defined in sprayed samples. These phases form a fine dendrite structure. The samples of converter matte, obtained by discharge of melt into water, had ternary structure due to release of metallic phase (Cu – Ni solid solution), allocated inside pores and along the boundaries of sulfide phases. Influence of cooling rate on reactive capacity of granular converter matte was estimated by behavior of the test samples in the whole cycle of autoclave leaching, including three stages: atmospheric copper purification, autoclave oxidation leaching and refining of nickel-cobalt solution. In the event, extraction of Ni and Cu is increased with a rise of melt temperature, what makes it possible to carry out more efficient separation of metals during autoclave refining process. Results of the carried out investigations can be used for development of new technologies of hydrometallurgical processing of Cu – Ni sulfide alloys.

This work was carried out, according to the project of General Committee of Russian Academy of Sciences No. 12-P-3-1031 (12-П-3-1031).

keywords High-copper converter matte, overheat temperature of melt, granulometric composition, phase composition, dendrite parameters, autoclave leaching
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