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Translated from Metallurg, No. 11, pp. 90–95, November, 2017.
Under conditions for maintaining a stable demand for aluminum in the world, the problem of providing basic high-quality raw material for its preparation, i.e., alumina, remains unresolved. In this connection, work is important aimed at finding ways of improved efficiency for preparing alumina, in particular, by an alkaline sintering method. Experimental data are presented for the defective nature of the structure of different modifications of (α′-, β-) dicalcium silicate 2CaО·SiO2 (С2S), comprising the basis of nepheline sinters. A thermoluminescence method (TSL) is used for C2S specimens prepared with different heat treatment regimes in the range from 1270 to 25°C, and different spectra are established that point to correlation of crystal lattice defect concentration and the degree of test C2S specimen cooling. A correlation is established between the degree of decomposition of different forms of C2S in aluminate-alkaline solution and structural defectiveness evaluated by TSL. It is shown that C2S crystal lattice defectiveness decreases with a reduction in the cooling rate. It is established that β-C2S formed with slow cooling exhibits less defectiveness compared with α′-C2S. Introduction of measures based on results of these studies makes it possible to increase alumina yield and quality used in primary aluminum production.
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V. M. Sizyakov, A. A. Vlasov, and V. Y. Bazhin, “Strategic tasks for the metallurgical complex of Russia,” Tsvet. Met., No. 1, 32–38 (2016).
X. L. Wang, Alumina Production Theory & Technology, Central South University, Changsha (2010).
S. Skaarup, Y. Gordeev, V. Volkov, and V. Sizyakov, “Dry sintering of nepheline – a new more energy efficient technology,” Light Metals, 111–117 (2014).
V. Smirnov, “Alumina production in Russia. P. I: Historical background,” JOM, 48, No. 8, 24–26 (1996). CrossRef
V. A. Lipin and A. Yu. Baimarkov, “Ways of improving technology for treating aluminosilicate raw material for alumina and associated products,” Tsvet. Met., No. 4, 64–68 (2014).
V. V. Sizyakov, Increase in the Efficiency of Comprehensive Processing of Nepheline Based on Using Carbo-Aluminate Compounds: Auth. Abstr. Dissert. Cand. Techn. Sci., St. Petersburg (2007).
B. A. Arlyuk, Comprehensive Treatment for Alkali-Aluminum-Containing Raw Material, Metallurgiya, Moscow (1994).
V. Ya. Abramov, Physicochemical Bases of Comprehensive Treatment of Aluminum Raw Material: Handbook, Metallurgiya, Moscow (1985).
A. V. Aleksandrov and R. Ya. Dashkevich, “Study of conditions for forming polymorphic modifications of dicalcium silicate and their behavior during leaching of aluminum-containing sinters,” Proc. 13th Int. Conf. Aluminum Siberia-2007, Krasnoyarsk (2007), pp. 460–463.
Lesley E. Smart and A. Elaine, Solid State Chemistry: An Introduction, CRC Press (2005).
Ch. N. R. Rao and J. Gopolakrishnan, New Directions in Solid Chemistry, Nauka, Novosibirsk (1990).
M. N. Sychev and E. N. Kazanskaya, “Study of elementary acts of element hydration,” Zh. Prikl. Khim., No. 4, 736–748 (1982).
T. V. Kuznetsova, “Reaction capacity of calcium silicates,” Zh. Prikl. Khim., No. 4, 945–948 (1986).
G. A. Lushcheikin, Polymeric Electrets, Khimiya, Moscow (1984).
H. A. Borbón-Nuñez and C. Furetta, “Activation energy of modified peak shape equations,” World J. Nucl. Sci. Technol., Nо. 07:04, 274–283 (2017).
G. A. Vagner, Scientific Dating Methods in Geology, Archaeology, and History, Tekhnosfera, Moscow (2006).
G. M. Polozov, Impurity Defectiveness, Thermal Stimulation of Luminescence and Activity of Dicalcium Silicate: Diss. Cand. Techn. Sci., Leningrad (1991).
K. R. Sature, B. J. Patil, S. S. Dahiwale, et al., “Development of computer code for deconvolution of thermoluminescence glow curve and DFT simulation,” J. Luminesc., Nо. 192, 486–495 (2017).
- Evaluation of the Effect of Nepheline Sinter Structure on Hydration Activity During Alumina Production
A. V. Aleksandrov
N. V. Nemchinova
G. G. Mineev
A. A. Yakovleva
- Springer US
in-adhesives, MKVS, Hellmich GmbH/© Hellmich GmbH, Zühlke/© Zühlke