南方离子型稀土原地溶浸土壤氮化物分布特征  

Distribution Characteristics of Nitrides in Soil of South China Ion-adsorption Rare Earth Ore Mining Area

作　　者：刘祖文[1] 王华生[1] 朱强 肖子捷 张念[1] 

机构地区：[1]江西理工大学建筑与测绘工程学院,江西赣州341000 [2]河北煜环环保科技有限公司土壤修复部,河北石家庄050000

出　　处：《稀土》2015年第1期1-5,共5页Chinese Rare Earths

基　　金：国家自然科学基金项目资助(51464014);江西省自然科学基金项目资助(20144BAB206034)

摘　　要：由于南方离子型稀土在开采中使用大量铵盐作为浸矿剂,导致矿区土壤中氮化物含量严重超标,附近水体严重污染。通过建立土柱实验模型,测定不同时间、不同深度稀土采区表层土壤中铵态氮、硝态氮和总氮的含量,研究了稀土采区土壤中氮化物的时间分布特征。实验结果表明,在不同淋洗水量条件下,稀土采区土壤中铵态氮和总氮含量降低明显,而硝态氮含量变化不明显,但在深层土壤中则反之。该发现为有效控制南方尤其是赣南离子型稀土矿土壤及水体氮化物污染奠定理论与技术基础。Because of using large amounts of ammonium as a leaching agent during mining South China ion-adsorption rare earth ore,soil in mining area contains excessive levels of nitride,and water around the area is polluted. Through establishment of experimental model of soil column and determination of ammonium nitrogen,nitrate nitrogen and total nitrogen content in soil at different washing times in different depth,the temporal distribution characteristics of nitrogen in the soil was studied. The results showed that,under the condition of different washing water,contents of ammonium nitrogen and total nitrogen in surface soil reduce significantly,and nitrate-nitrogen content does not change significantly,but changes of nitrogen contents at the bottom of the column are the opposite. These results will provide theoretical and technological foundation to control soil and water contamination by nitride in South China ion-adsorption rare earth mining area.

关 键 词：离子型稀土 原地溶浸 氮化物 时间分布 特征分析 

分 类 号：X53[环境科学与工程—环境工程]