Effect of Rare Earth Ions on Regular of Nitride Migration in Soil

Z. W. Liu, J. Zhang, C. B. Lu, C. H. Wen, F. J. Hu, X. Y. Yang

Ekoloji, 2018, Issue 106, Pages: 525-534, Article No: e106052

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Abstract

Ion-adsorption rare earth ore mining with ammonium sulfate as leaching agent in situ leaching is not perfect, due to seepage and other technical measure, which easily results in serious nitride pollution of soil and water in mining and surrounding areas. In this paper, the effect of rare earth ions of different species and different concentration on the migration of nitride in the soil was studied by using soil column simulation experiment. The results showed that the leaching loss of ammonium nitrogen in the school soil was higher than that in the mining soil under the action of leaching. The low concentration of exogenous rare earth could promote the accumulation of ammonium nitrogen in the soil, while the high concentration was inhibited. When the concentration of yttrium, lanthanum and mixed rare earth were 5-10 g/kg, 0-1 g/kg, 0-1 g/kg, the concentration of ammonium nitrogen reached the maximum. The trend of available nitrogen concentration was consistent with that of ammonium nitrogen. The effect of yttrium on the contents of nitrate nitrogen in the soil was not significant, but the lanthanum showed some inhibitory effect, and the mixed rare earth showed the characteristics of "low concentration-promoting and high concentration-inhibiting" in the soil. The conclusion will lay a theoretical foundation for the control of nitrification in soil and water body of ionic rare earth mine.

Keywords

rare earth ions, soil, ammonium nitrogen, migration regularity

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