盐酸浸出白云鄂博选铁尾矿中经钙化焙烧的稀土

白云鄂博选矿厂现弱磁选-强磁选-浮选工艺的弱磁选尾矿再经钙化焙烧-弱磁选选铁后的尾矿REO含量为12.27%，主要成分为稀土氧化物和萤石，氟磷灰石、石英等少量。对盐酸浸出其中稀土氧化物的工艺条件进行了研究。结果显示，在盐酸浓度为1.5 mol/L，浸出温度为 45 ℃，液固比为10∶1 mL/g，浸出时间为60 min，搅拌速度为300 r/min情况下，稀土浸出率可达93.15%，氟浸出率仅为0.23%，表明在控制氟浸出的前提下稀土得到了高效浸出。

After Calcium Roasting Rare Earths of Bayan Obo Iron Tailings Leaching by Hydrochloric Acid

REO content of tailings from calcium roasting-low intensity magnetic separation tailings from Bayan Obo Plant low intensity magnetic separation-high intensity magnetic separation-flotation was 12. 27%. Main components is rare earth ox-ides,fluorite,small quantity of fluorapatite and quartz. Hydrochloric acid was adopted to study leaching rare earths in material and relevant processing parameters were studied. The results indicated that:when hydrochloric acid concentration is 1. 5 mol/L,leaching temperature is 45 ℃, ratio of liquid to solid is 10 : 1 mL/g, leaching time is 60 min, stirring rate is 300 r/min,leaching rate of rare earths could reach 93. 15% and the leaching ratio of fluorine was only 0. 23%. Under the low leaching ratio of fluorine premise,the rare earth could be efficiently leached.