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.
A large number of ions dissolve into the water from mold flux during the molten slag contacting with the secondary cooling water at the mold exit,leading to the water quality changed.So the acidic water accelerates the corrosion of continuous casting equipment,and significantly increasing F-content in the water also leads to water pollution.The fluorine-free,low fluorine and high fluorine mold flux were researched by the leach tests of molten slag for investigation of effects of mold flux on water quality.The results show that the pH of leaching water of fluorine-free mold flux varies from 7 to 10;the F-ions concentration of leaching water of low fluorine mold flux is about 5-7 mg/L and the pH ranges from 7 to 10;but the F-ions concentration of leaching water of high fluorine mold flux is up to 35 mg/L,the pH ranges from 4 to 10.Dissolving of cations from mold flux by ion exchange makes the water alkaline,while dissolving of F-ions by ion exchange makes the water acidic.So pH of the water is decided by the two kinds of ion exchange process.The dissolution of F-ion is inhibited in the fluorine-free and low fluorine mold flux,so the water pollution and the formation of corrosive acidic water caused by fluorine are inhibited.
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