Zh. Abishev Chemical and Metallurgical Institute (Karaganda, Kazakhstan):

E. N. Makhambetov, Dr. Eng., Head of the Laboratory of Ferroalloys and Recovery Processes

A. S. Baisanov, Cand. Eng., Prof., Head of Laboratory of Pyrometallurgical Processes

Zh. Abishev Chemical and Metallurgical Institute (Karaganda, Kazakhstan)¹ ; Abylkas Saginov Karaganda Technical University (Karaganda, Kazakhstan)²:
N. R. Vorobkalo, Master Eng., Researcher, Laboratory of Pyrometallurgical Processes¹ ; Doctoral Student², e-mail: nina.timirbaeva23@gmail.com

Karaganda Industrial University (Karaganda, Kazakhstan):
E. A. Mynzhasar, Master Eng., Doctoral Student

The object of the study in this work is the process of smelting of vanadium alloying composition and vanadium ferroalloy using non-standard reducing agents, such as silicon-aluminum ferroalloy (ferrosilicoaluminum) and high-ash coal. Within the framework of this work, it is proposed to use silicon-aluminum reducing agents and highash coal as a replacement for expensive aluminum powder, ferrosilicon, and metallurgical coke which are used in conventional technologies for smelting of vanadium alloys and alloying compositions. To develop the technology for smelting of vanadium alloying composition using a silicon-aluminum reducing agent, a series of large-scale laboratory tests was carried out in the smelting furnace with provided installation for temperature recording, which was specially assembled by employees of the Zh. Abishev Chemical and Metallurgical Institute (ChMI). Tests on the smelting of a vanadium-containing ferroalloy using vanadium slag obtained by smelting of vanadium alloying composition by ladle treatment method, as well as converter vanadium slag, quartzite and high-ash coal (ash content 45-50 %) as a reducing agent, were also carried out in large-scale laboratory conditions in the ore smelting furnaces with 200 kVA transformer power. Experimental tests have shown positive results on the use of these non-conventional reducing agents in the composition of charge materials for smelting of vanadium-containing alloys and alloying compositions. Vanadium alloying composition was obtained by ladle treatment method using ferrosilicoaluminum, the average chemical composition of this alloying composition was, %: V 55; Si 10-24; Al 4-9 and Fe 10-30. Extraction of vanadium in the alloy was 70-80 %. Vanadium alloy was obtained by carbothermal method using high-ash coal and is characterized by the following average composition, %: V 4-10; Si 40-55; Al 15-20 and Fe 13-25. The degree of vanadium extraction makes 70 %.

The research was conducted within the framework of program-aimed financing of the scientific and technical program “Creation of the new composite materials with high operating properties on the base of rare and rareearth elements” of the Committee of industrial development of the Ministry of industry and infrastructure development of Kazakhstan Republic.

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