赤泥中氟迁移转化的影响因素分析

Analysis on the influence factors to fluorine transfer in red mud

为了研究赤泥中氟向下运移过程中的影响因素,根据堆场周围的水文地质条件,设计了7组动态淋溶试验,并对试验数据进行了灰色关联度分析。结果表明,排放7天后的赤泥表面以下700mm处的温度仍达78℃,而刚排放到堆场的冲灰水温度更高,可达87.5℃,高温赤泥和冲灰水有利于氟的迁移;赤泥的pH值为10.29~11.83,浸出液的pH值为12.00~13.20,碱性很大,致使氟易随水迁移;赤泥的其它污染组分,如总硬度、Cl-、SO42-、K＋、Na＋、Ca2＋、Mg2＋,均对氟的迁移有一定的影响,且Na＋、SO42-和Ca2＋为主要控制因素,即溶液中Na＋、SO42-、Ca2＋含量越高,赤泥中的F-离子越易淋出。

In order to study the influence factors to fluorine transference in red mud,the paper designs seven groups of dynamic leaching experiments on the basis of hydrogeological conditions around the piled field of the red mud,and carries on grey relationship analysis on the tentative data.The results prove that the temperature is 78℃ from the surface under 700 mm position of the red mud that discharged after seven days and the temperature is 87.5℃ of the ash water that is discharging just now;high temperature is of advantage to fluorine transfer; the pH value of the red mud is 10.29 to 11.83 and the pH value of the leaching solution is 12.00 to 13.20;high alkalinity is propitious to fluorine transfer;the other components of the red mud is as follows： total hardness,Cl-,SO2-4,K＋,Na＋,Ca2＋,Mg2＋ are all influence factor to fluorine transfer,and Na＋,SO2-4 and Ca2＋ are the primary control factors.