冷冻条件下高氟水氟离子迁移规律研究  

Study on Rules of Fluorine Migration in High-fluorine Water by Freeze-dephlegmation

作　　者：郝亚超[1] 费学宁[1] 姜远光[1] 姜川[1] 

机构地区：[1]天津城市建设学院环境与市政工程系,天津300384

出　　处：《天津城市建设学院学报》2009年第4期276-279,共4页Journal of Tianjin Institute of Urban Construction

摘　　要：冷冻分凝是溶液中溶质溶剂分离的一种有效方法.文章以高氟水溶液为研究对象,考察了冷冻条件下,氟离子在固液两相中迁移的分布规律.研究结果表明:在-10.℃冷冻条件下,处理氟离子含量为2～6.mg/L的高氟水,成冰率为50%时,冰融水中F-浓度可达到0.66.mg/L以下.高氟水在冷冻过程中所形成的固相中F-浓度随冷冻时间成"U"型分布.冰融水中F-浓度呈先增加,后随冰层厚度的增加其浓度开始降低,冷冻结束时又升高的规律,依次形成微污染层、纯净层和混合层.当固相总量占溶液体积的70%时,各层冰融水混合后F-离子浓度总量在1.mg/L以下.种冰的加入能够使冰融水中F-含量降低至0.05～0.14.mg/L,电导率在8.7～9.8.μS/cm之间.Freeze-dephlegmation is an effective way to separate the solute or solvent from solution. With high fluoride water solution as research object, this study explores the migration and distribution rules of fluorine both in solid phase and liquid phase under frozen conditions. Under the freezing condition at -10℃, after being treated the high-fluorine water with the fluorine of 2 - 6 mg/L and then ice rate of 50% has the concentration of F- in melted ice water under the 0.66 mg/L. In a range of freezing time within the solid phase formed in the freezing process, the fluorine concentration in high-fluorine water shows itself in a U-type distribution. In the melted ice water, the concentration of F- varies in the following rule： at first it increases, and then as the thickness of the ice layer increases it begins to decline, at last when the freezing is over it is on the rise again, which in turn brings about the formation of slightly polluted layer,clean layer ,mixed layer. When the rate of ice is 70 percent, the total fluoride concentration of the mixture of all levels of melted ice water is under 1 mg/L. Moreover, with the use of seed ice, the content of F- can be reduced to 0.05 - 0.14 mg/L, and the conductance of ice melted water is between 8.7 and 9.8 μS/cm.

关 键 词：高氟水 冷冻分凝 氟离子浓度 

分 类 号：P641[天文地球—地质矿产勘探]