Phase Transformation and Leaching Property of Low-Lime Calcium Aluminate Clinker

doi:10.12068/j.issn.1005-3026.2016.01.013

Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (1): 59-63.DOI: 10.12068/j.issn.1005-3026.2016.01.013

• Materials & Metallurgy • Previous Articles Next Articles

Phase Transformation and Leaching Property of Low-Lime Calcium Aluminate Clinker

ZHANG Di^1,2， YU Hai-yan¹， PAN Xiao-lin¹， ZHAI Yu-chun¹

1. School of Materials & Metallurgy， Northeastern University， Shenyang 110819， China; 2. School of Materials Science and Engineering， Hebei University of Science and Technology， Shijiazhuang 050018， China.

Received:2014-11-11 Revised:2014-11-11 Online:2016-01-15 Published:2016-01-08
Contact: PAN Xiao-lin
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Abstract

Abstract: The melting temperature， mineral phases， pulverization and alumina-leaching properties of clinkers were studied by using analytical reagent CaCO₃， Al₂O₃ and SiO₂ as raw materials. The molar ratio of CaO to Al₂O₃ is 1.0 and the mass ratio of Al₂O₃ to SiO₂ is 3.0. The results showed that the melting temperature of the sample is 1392℃. The clinker sintered at 1350℃ is composed of CaAl₂O₄， Ca₁₂Al₁₄O₃₃ and γ-Ca₂SiO₄， which has good pulverization property and alumina leaching rate of 93.37%. The materials melt locally and turn into heterogeneous phases at 1400℃， which blocks the elemental diffusion， results in non-homogeneous phases， and inhibits the conversion of β-Ca₂SiO₄ to γ-Ca₂SiO₄. The formation of Ca₂Al₂SiO₇ and deterioration of pulverization property sintered at 1400℃ are the main reasons for the low alumina leaching rate of 74.50%. The clinker sintered at 1450℃ melts completely， which improves the pulverization property and the alumina leaching property of clinker.

Key words: melting temperature, lime sintering, CaAl₂O₄, Ca₁₂Al₁₄O₃₃, particle size

CLC Number:

TF821

ZHANG Di， YU Hai-yan， PAN Xiao-lin， ZHAI Yu-chun. Phase Transformation and Leaching Property of Low-Lime Calcium Aluminate Clinker[J]. Journal of Northeastern University Natural Science, 2016, 37(1): 59-63.

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Phase Transformation and Leaching Property of Low-Lime Calcium Aluminate Clinker

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