Mechanism Analysis of Casting Wheel Crystallizer Scaling Produced by SCR 7000 Copper Rod
The scaling layer on the surface of a SCR 7000 casting wheel crystallizer was analyzed by SEM,EDS and XRD,and the scaling mechanism was investigated combined with the interaction between spray cooling water and high temperature casting wheel.The results indicate that the scale layer in the groove of inner cavity of crystallizer is com-posed of carbon black,Cu,Cu2O and CaO,which is formed by the combination of enrichment of carbon black gener-ated by incomplete combustion of acetylene,concentration and precipitation of CaCO3 in the slag flushing water,high-temperature decomposition,and high-temperature diffusion of Cu crystallizer and copper billet.The scale layer at the bottom and outside of the crystallizer is mainly composed of CaCO3,which is attributed to great hardness of spray water caused by evaporation of cooling water and insufficient water treatment capacity.CaCO3 crystals are supersatu-rated and precipitated on the surface of the high temperature casting wheel,and CaCO3 particles attached to the spray water film at the bottom of the circular motion casting wheel are subject to centrifugal force,accelerating the formation of CaCO3 crystal scale.The difference in the phase,thickness and uniformity of scale layer on each side of crystallizer leads to the abnormal solidification structure of inverted trapezoidal copper billet.By reducing the hardness of the turbid circulating water and adopting the technology of flushing slag with clean circulating water,the scaling degree of casting wheel and the solidification structure of the copper billet is significantly improved.
Casting Wheel CrystallizerSolidification Structure of Copper BilletScaling Mechanism
NETL
NSTL
万方数据
维普
