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从结晶器下口出来的含氟连铸保护渣熔渣与二冷水接触过程中,大量的离子释放到水中导致水质发生改变,呈酸性的二冷水不仅加速了连铸设备的腐蚀,水中大幅增加的F-还会导致水污染。为了研究连铸保护渣熔渣对水质产生影响的机制,通过熔渣水浸实验研究了无氟、低氟和高氟连铸保护渣水浸过程中水质的变化规律。水浸实验结果表明,无氟保护渣熔渣水浸实验过程中水样的pH值在7~10之间;低氟保护渣水样的F-质量浓度为5~7 mg/L,pH值在7~10之间;而高氟保护渣水样的F-质量浓度高达35 mg/L,pH值在4~10之间。保护渣中阳离子通过离子交换溶出导致水样呈碱性,而F-的交换溶出则会导致水样呈酸性,因此,水样的pH值则是由两类离子交换过程共同决定。无氟或低氟保护渣中由于氟的降低而减少了F-的交换溶出,从而抑制了氟造成的水污染及强腐蚀性的酸性二冷水的生成。
In the process of contact between molten slag and secondary cooling water, the release of a large amount of ions into the water leads to the change of water quality. The acidic secondary cooling water not only accelerates the corrosion of the continuous casting equipment, but also greatly increases the water content F- can also cause water pollution. In order to study the mechanism of continuous casting mold slag on water quality, the variation of water quality in the process of water immersion of non-fluorine, low fluorine and high fluorine continuous casting mold flux was studied by the slag immersion test. The results of water immersion test showed that the pH value of water samples during the immersion test of non-Fluoride flux slag was between 7 and 10; the F-mass concentration of low-fluoride flux water samples was 5 ~ 7 mg / L, pH value In the range of 7 to 10; however, the F-mass concentration of high-fluoride mold flux water sample is as high as 35 mg / L and the pH value is between 4 and 10. Cationic ions in the flux are eluted by ion exchange, resulting in the alkalinity of the water sample. However, exchangeable dissolution of F-1 results in acidity of the water sample. Therefore, the pH value of the water sample is determined by both types of ion exchange processes. Fluorine-free or low-fluoride mold fluxes are reduced by F-exchange and dissolution, thereby suppressing fluorine-induced water contamination and formation of highly corrosive acidic secondary cooling water.