2019 Volume 59 Issue 6 Pages 430-445
Estimating for leaching-mechanisms of heavy metals are important in order to understand the pollution state of peripheral environments of rock muck disposal sites.
This study examined the mechanisms of arsenic leaching from rock muck disposal sites at acid, alkaline and neutral conditions. The leaching-potential of heavy metals are from rock materials influenced by many parameters; e.g. the existing form of these elements in rock materials, the leaching mechanisms from rock materials, the advection/diffusion in aquifer and adsorption onto ground materials.
We examined the arsenic leaching mechanisms by two type experiments considering water-rock interaction; one is the static batch-leaching test and the other is the leaching te st under water flowing condition in soil tank test.
The results of the static leaching test show that water- rock interaction progresses under high Eh conditions is in constant solid-liquid proportion. It is suggested that the water flow condition leaching test can simulate the arsenite（H3AsO30） leaching mechanisms in reduction condition in aquifers.
