Papers by Keyword: Reaction Shaft

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.

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 then the slag surface tensions were measured using a RTW-10 type synthetic test instrument for melt physical property by means of suspension link. The effects of temperature ( T ), basicity ( B ), the Fe/SiO₂ ratio (m_Fe/m_SiO2), Fe₃O₄ content (ω_Fe3O4), Cu₂O content (ω_Cu2O), MgO content (ω_MgO) and CaO content (ω_CaO) on the slag surface tension (δ) were also studied. Results show that δ fluctuate between 0.3N/m to 0.8 N/m, and is increased with the increase of T, B, m_Fe/m_SiO2, ω_Cu2O, ω_MgO and ω_CaO, and with the decrease of ω_Fe3O4, under the range of slag contents: m_Fe/m_SiO21.36~1.78, ω_Fe3O4 17.83%~21.18%,ω_Cu2O 3.51%~8.34%,ω_MgO 2.21%~6.57%,ω_CaO 6.22%~9.87% and the temperature range of 1380°C to 1500°C. To make the freeze slag adhere to the reaction shaft inner wall easily, the Fe₃O₄ content in freeze slag should be increased and the inner chamber temperature of reaction shaft should be controlled appropriately.