Evaluation of Melting Temperature of the Freeze Slag in Reaction Shaft of Flash Smelting Furnace

Abstract:

According to the reaction shaft operation characteristics during the flash smelting process, 15 groups of slag samples containing high Fe₃O₄ were prepared by some chemical reagents, and the slag melting temperatures were measured using a ZDHR-200 type intelligent test instrument for ash melting point by means of hemisphere point. Then, the mathematical formula between the melting temperature and the chemical composition of freeze slag were acquired by means of nonlinear regression analysis. The effects of the Fe/SiO₂ ratio (m_Fe/m_SiO2), CaO/SiO₂ ratio (m_CaO/m_SiO2), Fe₃O₄ content (ω_Fe3O4), Cu₂O content (ω_Cu2O) and MgO content (ω_MgO) on the slag melting temperature were also studied. Results show that the melting temperatures calculated by the regression formula reproduce the experimental data in molten freeze slag with high precision. The slag melting temperature ascends rapidly with increasing ω_Fe3O4 when ω_Fe3O4>18%, and descends quickly when ω_Cu2O raises from 3 % to 7 %, but descends slowly with increasing ω_MgO. The melting temperature tend to go down first and then rise up with the increase of m_Fe/m_SiO2 and m_CaO/m_SiO2, arriving at the minimum when m_Fe/m_SiO2=1.3 and m_CaO/m_SiO2=0.8, respectively.

• Periodical: Advanced Materials Research (Volume 402)
• Pages: 277-282
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.402.277
• Online since: November 2011
• Authors: Jin Liang Wang, Yan Xin Wu, Li Wei Liang
• Keywords: Flash Smelting Furnace, Freeze Slag, Melting Temperature, Reaction Shaft

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