Open AccessExperimental research on the laws of acidification and salinization under the conditions of Ionic rare earth leaching and water Leaching
Author(s) -
Bin Chen,
Guoqiang Chen,
Hanxin Huo,
Yibin Zhu,
Wenlong Zhai
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/804/2/022017
Subject(s) - leaching (pedology) , soil salinity , leaching model , chemistry , salinity , sulfate , environmental chemistry , rare earth , ammonium , soil water , ammonium sulfate , research object , environmental science , salt (chemistry) , soil science , geology , mineralogy , oceanography , organic chemistry , chromatography , regional science , geography
In the ionic rare earth mining,ammonium sulfate is used as a leaching agent for in-situ leaching, the concentration of ammonium sulfate is 2%∼3%, and the pH is 4∼5, leading to soil acidification and increased salt content. In this paper,taking a rare earth mining area in Guangdong as the research object, carried out soil column simulation test research. After leaching with water for the soil column that complete leaching, in condition of using different leaching agents of pH values and different water leaching process characteristics, the variation of pH and total salt content was studied. The results show that, after leaching ,the mineral sample changed from mild acidification to non-acidification, and the the salt content of the mineral sample was effectively reduced, the salt leaching rate is above 57%. The research conclusions laid a theoretical foundation for soil acidification and salinization control in ion-type rare earth mining areas.