STUDY OF THE PHASE-AND-CHEMICAL COMPOSITION OF SILICON PRODUCTION FURNACE SLAGS
https://doi.org/10.17073/0021-3438-2017-1-31-39
Abstract
Metallurgical grade silicon produced in ore-smelting furnaces (OSF) generates a negligible amount of a furnace slag compromising the valuable smelted product quality. The purpose of the study was to analyze the factors of furnace slag formation with its further passing into silicon when released from the ore-smelting furnace, as well as to study the chemical composition of samples. The computer program was developed to forecast the yield of smelting products (crude silicon, dust-gas mixture, furnace slag) depending on the amount and chemical composition of loaded charge material, i.e. siliceous raw ore and carbonaceous reductants. The paper provides the results of studying OSF slag samples from the existing plant by metallographic, X-ray, and X-ray diffraction methods and electron probe microanalysis. The study showed the presence of entrapped silicon prills with intermetallic inclusions (Fe(Ti)Si, CaSi2), silicon carbide SiC, incompletely reduced α-SiO2-cristobalite and Al2O3, and formed complex oxides of impurity elements (CaO·SiO2). It was found that the amount of formed furnace slag and thus the chemical composition of smelted silicon depend on the optimal excess of solid carbon in charge (within 103–111 %) and stable electrical operation of the ore-smelting furnace.
About the Authors
N. V. Nemchinovа
Irkutsk National Research Technical University
Russian Federation
Russian Federation
Dr. Sci. (Tech.), prof., head of Department «Metallurgy of non-ferrous metals»,
664074, Irkutsk, Lermontov str., 83
T. A. Buzikova
Irkutsk National Research Technical University
Russian Federation
master student, Department «Metallurgy of non-ferrous metals»
Russian Federation
master student, Department «Metallurgy of non-ferrous metals»
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Review
For citations:
Nemchinovа N.V., Buzikova T.A. STUDY OF THE PHASE-AND-CHEMICAL COMPOSITION OF SILICON PRODUCTION FURNACE SLAGS. Izvestiya. Non-Ferrous Metallurgy. 2017;(1):31-39. (In Russ.) https://doi.org/10.17073/0021-3438-2017-1-31-39
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