All biogenic solids contain > 1000 mg/kg P, roughly 5 times more than tailings collected at the waterline or above the water line at Lost Lake or the Frog Pond (LL2; 300-400 mg/kg P), and 100 times that of tailings from Lost Lake sediment cores and most of the ore samples (< 100 mg/kg P; LCD-4 was the exceptional ore sample with 450 mg/kg P).
Till 2012, China has accumulated more than 12,000 tailings impoundments, 3000 of which are with a volume greater than 106 m3.
In samples from the acidic tailings, more than 15% of the Zn and 55% of the Cd were extractable with 0.1 M NaNO3, and distilled water.
Currently in China there are more than 12,000 tailings impoundments and almost 95% of them use the upstream method for the construction of the dam.
Besides densifying and dewatering tailings more efficiently, the PAM-PPO copolymers had molecular weights ten times smaller than the reference anionic PAM flocculant, which reduced their viscosities and shear-sensitivities.
A similarly analyzed RNA Polymerase II profile showed a more diffuse and tailing distribution, which might reflect the progression of the polymerase along transcribed genes.
Further, current mineral processing techniques produce more and more fine tailings.
4) As the load increased, the motion of the particles near the interface of the coarse and fine tailings was more obvious than the motion of the other particles, which is supported by the observation that the fine particles moved into the pores of the coarse tailings.
The price of uranium has risen since 2001, so enrichment tailings containing more than 0.35% uranium-235 are being considered for re-enrichment, driving the price of depleted uranium hexafluoride above $130 per kilogram in July 2007 from $5 in 2001.
The company says that it had the permits and that the tailings are nothing more than ground-up rock and sand.
