摘要
以南方某铀尾矿石为研究对象,探究pH、粒径、浸泡时间等因素对尾矿中铀、钍放射性元素释放的影响。将待测铀尾矿样分为-0.45 mm、0.45~8 mm、+8 mm三个粒度区间,设置三组pH分别为4.0、5.0、6.0的淋浸液,连续浸泡42 d。结果表明:三组粒度,在相同试验条件下,钍元素比铀元素更难从尾矿中酸泡浸出,其中粒度越小的尾矿,放射性元素(U、Th)的释放量越大。粒度-0.45 mm组中,U和Th最大释放量分别为8.42 mg/L和0.151 mg/L。
Effects of pH values,particle sizes and soaking time on release of uranium and thorium radioactive elements in waste uranium tailings were investigated.Tailings samples to be tested were divided into three particle size ranges,i.e.,-0.45 mm,0.45-8 mm and+8 mm,and continuously soaked for 42 days with pH values of 4.0,5.0 and 6.0 respectively.The results show that the smaller the size of tailings is,the greater the release amount of radioactive uranium and thorium is.Thorium is more difficult to be leached than uranium under the same environmental conditions.The maximum release amount of uranium and thorium with particle sizes of-0.45 mm is 8.42 mg/L and 0.151 mg/L,respectively.
作者
王文凤
陈功新
曾文淇
李稳
WANG Wen-feng;CHEN Gong-xin;ZENG Wen-qi;LI Wen(School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2019年第10期46-49,66,共5页
Nonferrous Metals（Extractive Metallurgy)
基金
国家自然科学基金资助项目(41662015,U1501231)
关键词
铀尾矿
静态浸泡
粒径
U
Th
pH
uranium tailings
static soaking
particle size
U
Th
pH
