摘要
辽宁凤城硼铁矿是大型硼、铁、铀共生的多金属矿床,采用露天开采—选矿—冶金工艺得到铁精矿、五水硼砂和重铀酸盐产品,生产过程中产生采矿废石、选矿尾矿、水冶尾渣等多种不同性质的固体废物。对全流程工艺过程、产品和固体废物的放射性特征进行了调查,并对固体废物资源化利用进行了计算分析。结果表明,铁精矿、硼砂产品的放射性达标,铀产品为天然放射性物质;采矿废石、选矿尾矿、碎石、粗砂和硼泥可作为普通固体废物处理处置,其中碎石和粗砂可作为建筑砂石料使用;硼泥掺量不超过50%的亚纳米硅晶石,满足《建筑材料放射性核素限量》(GB 65660—2010)规定的不同建筑材料放射性核素限量要求,其使用不受限制;水冶尾渣属于极低放废物,应建立独立的尾矿库进行处置。
Fengcheng paigeite deposit is a large scale multi-metal deposit containing boron,iron and uranium,which is developed by open-pit mining,following by beneficiation(gravity separation,magnetic separation,and flotation)and hydrometallurgical treatment to obtain iron concentrate,sodium borate,and diuranate as products.In this process,several kinds of solid waste are produced such as mining waste rock,beneficiation tailing,and leached uranium tailing.Through detailed investigation of the radioactive characteristics of product and solid waste in the full process,it is indicated that iron concentrate and sodium borate meet their radioactivity quality standard.Mining waste rocks,beneficiation tailing,gravel and coarse sand produced by crushing of ore,and boron mud can be treated and disposed as ordinary solid waste other than radioactive waste.Gravel and coarse sand can be used as building materials.Boron mud is used to produce sub-nanomater silica stone without any limitation related to radioactivity,in case of the boron mud addition not exceeding 50%.Leached uranium tailing should be disposed as extremely low level radioactive waste.
作者
李建华
王亮
程威
周越
陈希
逄海骋
LI Jianhua;WANG Liang;CHENG Wei;ZHOU Yue;CHEN Xi;PANG Haicheng(Beijing Research Institute of Chemical Engineering and Metallurgy,CNNC,Beijing 101149,China)
出处
《铀矿冶》
CAS
2024年第2期73-79,共7页
Uranium Mining and Metallurgy
基金
国家重点研发计划(2020YFC1909800)。
关键词
硼铁矿
固废
放射性
铀
paigeite
solid waste
radioactivity
uranium
