Material Ratio Optimization of Low Mass Ratio of Alumina to Silica of Calcium Aluminate Slag Based on Thermodynamic Calculation Method

Abstract:

For the low m(Al₂O₃)/m(SiO₂) (mass ratio, for short A/S) calcium aluminate slag obtained from smelting reduction Pingguo red mud, the impact of different n(CaO)/n(Al₂O₃))(molar ratio, for short C/A) and A/S on the separateing out phase of slag in cooling and solidification process was studied by FactSage thermodynamic calculation software, and the material ratio of the slag was optimized. The physical-chemical properties of slag prepared in the experiment were analyzed by means of XRD, EMS, EDS, Particle size analysis and Chemical analysis. The thermodynamic calculation results indicate that the effect of C/A on the phase composition of the slag is great, but the influnce of A/S from 0.5 to 1.0 is small, the material ratio optimized is C/S=2, A/S=0.5～1.0, C/A=1.61～1.81, under the conditions, the phase composition is mainly Ca₂SiO₄, Ca₁₂Al₁₄O₃₃ and even a small amount of less than 5% of CaAl₂O₄ or Ca₃Al₂O₆. The phase composition of experimental slag is consistant with that of thermodynamic calculation. In the material proportion optimized scope, the calcium aluminate slag has better the self-disintegrating and the alumina leaching performance, and satisfies completely the technological requirements of extracting alumina. The results provide the scientific basis for using the low A/S calcium aluminate slag obtained from smelting reduction Pingguo red mud producting alumina.

• Periodical: Advanced Materials Research (Volume 402)
• Pages: 288-292
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.402.288
• Online since: November 2011
• Authors: Zhi Fang Tong, Sen Lin Xie, Li Heng Zhang, Tao Chen, Wei Liu, Gui Huan An
• Keywords: Ca₁₂Al₁₄O₃₃, Calcium Aluminate Slag, Mass Ratio of Alumina to Silica, Thermodynamic

References

[1] J.D. ZHANG, Y.T. LI, S.W. BI: Light Metal.Vol.8(1992),pp.16-18

[2] Z.F. TONG: Study of Comprehensive utilization of high-iron bauxite of Guigang in Guangxi province.Northeastern Univ.(2005)

[3] C.X. LI: Min. and Metallurgical Eng.Vol.20(2000),p.58

[4] S.W. BI, Y.H. YANG, Y.T. LI: Light Metal.Vol.6(1992),pp.10-15

[5] J.Grymek: Light Metals.Vol.9(1987),pp.91-97

[6] B. WANG, H.Y. YU, H.L. SUN, S.W. BI: Process Eng.Vol. 5(2008),pp.949-953

[7] Y.J. JIANG, P. NING: Environmental Sci. & Technol. Vol.1(2003), p.23

[8] C.W. Bale, P. Chartrand S.A. Degterov: Calphad.Vol.26(2002),pp.189-228.

[9] Z.M. CAO, X.Y. SONG: rare metal.Vol. 4( 2008),pp.216-219

[10] Wenjia Song, Lihua Tang, Xuedong Zhu, Yongqiang Wu, Yongqiao Rong, Zibin Zhu, Shuntarou Koyama: Fuel.Vol. 88(2009),p.297–304