摘要
铀矿石堆浸浸出液用沉淀法回收铀时 ,对最终沉淀黄饼产品质量影响最大的杂质元素是 Fe和 Al等。首先 ,浸出液在 p H=1 .8左右以铁矾沉淀法除铁 ,产生的铁矾沉淀物为结晶体 ,易于过滤和洗涤 ,铀的夹带损失小。除铁后的浸出液在 p H为 2 .8～ 3 .5范围内用过氧化氢选择性地沉淀铀 ,此时铝不沉淀 ,从而使铀与包括铝在内的其它杂质离子有效地分离。所得到的黄饼为结晶的水合过氧化铀 ,过滤性能好 ,铀含量高 ,杂质含量低 ,产品质量能满足新的黄饼一级品标准。新工艺经工业生产验证 ,具有投资省 ,操作简单 ,总回收率高 ,处理量大 ,试剂消耗低 。
In this paper a novel method is presented for recovering uranium from leaching solution of uranium ore heap leaching by jarosite hydrogen peroxide two step precipitation.The iron in leaching solution is precipitated as jarosite crystal at about pH=1.8 while the uranium is kept in solution.The uranium is then precipitated as yellowcake product (uranium peroxide) by adding hydrogen peroxide at pH=2.8~3.5,further separated from aluminum and other impurities.The yellowcake is a high quality precipitate with high uranium content ( w (U)>65%) and good filtration properties.The overall recovery of the process exceeds 98%.
出处
《铀矿冶》
CAS
2002年第2期74-79,共6页
Uranium Mining and Metallurgy
