Transport kinetics of Pollutants in In-Situ Leaching of Ionic Type Rare-Earth Ore

Taking Ganzhou city longnan zudong in-situ leaching of ionic rare earth ore soil as the research object, (NH4) 2SO4 as the leaching agent,we forecast and analyze leaching residues pollutants’diffusion rule over time in the soil layer. Constructing pollutants dispersion model,fitting pollutant dispersion changes based on Matlab platform, results show: As time increases, both NO3--N concentration in two soil layers decreased. But the NO3--N migration rate in the soil layer without leaching was clearly slower than the other which had already been leached and extracted. As time increases, both NH4+-N concentration in two soil layers decreased. But the NH4+-N rate in the soil layer without leaching was clearly slower than the other which had already been leached and extracted. As time increases, both SO42-concention in two soil layer decreased, but the SO42-migration rate in the soil layer without leaching was clearly slower than the other which had already been leached and extracted.