摘要
以承德铁矿矿集区不同类型的典型代表性铁矿原矿石、磁选尾矿、废石为对象进行放射性水平研究,研究发现承德地区各类型铁矿典型矿区铁矿石、尾矿、废石中238 U含量最大分别达到320 Bq kg、290 Bq kg、390 Bq kg,为接触交代型矿区;232 Th含量最大分别达到130 Bq kg、143 Bq kg、54 Bq kg;226 Ra含量最大分别达到97 Bq kg、80 Bq kg、45 Bq kg,为沉积变质型矿区、接触交代型矿区;铀(钍)系单个核素活度浓度均小于1000 Bq kg,建议可简化建设项目环境影响评价管理要求,豁免该地区铁矿开采、磁选项目环境影响评价书(表)开展铀(钍)系单个核素活度浓度检测。该地区铁矿石加工过程中的废石、尾砂放射性活度发生富集效应,产生的核素水平要大于原始伴生放射性矿。
In this paper,raw ore,magnetic separation tailings and waste rock of the typical mines of different types of iron ore in Chengde iron ore concentration area are selected as objects to research the radioactivity level.It is found that the maximum 238 U content of iron ore,tailings and waste rock in the typical mining areas of various types of iron ore in Chengde area reaches 320 Bq kg,290 Bq kg and 390 Bq kg respectively,which are contact metasomatic mining areas.The maximum 232 Th content is 130 Bq kg,143 Bq kg and 54 Bq kg respectively.The maximum content of 226 Ra reaches 97 Bq kg,80 Bq kg and 45 Bq kg respectively,which are depositional metamorphic mining area and contact metasomatic mining area.The activity concentration of single uranium(thorium)series nuclide is less than 1000 Bq k g.It is suggested that the environmental impact assessment management requirements of construction projects can be simplified,and the detection of single uranium(thorium)series nuclide activity concentration can be exempted from the environmental impact assessment(table)of iron mining and magnetic separation projects in this area.In the process of iron ore processing in this area,the radioactive activity of waste rock and tailings is enriched,and the level of nuclide produced is higher than that of the original associated radioactive ore.
作者
王洪斌
谌治
王宸
刘金林
WANG Hongbin;CHEN Zhi;WANG Chen;LIU Jinlin(Chengde Appraisal Center for Environment and Engineering,Chengde 067000,China;Formerly Hebei Environmental Engineering College,Qinhuangdao 066000,China;Beijing Puran Ecology and Environment Technology Co.,Ltd.,Beijing 100020,China)
出处
《环境影响评价》
2023年第6期76-80,共5页
Environmental Impact Assessment
关键词
承德铁矿矿集区
伴生矿
放射性
富集
Chengde iron ore concentration area
associated ore
radioactivity
enrichment
