Recrystallization of Lead Oxide from Molten Lead

Adsorption Mechanism of Lead on Wood/Nano-Manganese Oxide Composite

Discharge of untreated industrial wastewater containing heavy metals such as Pb2+ is hazardous to the environment due to their high toxicity. This study reports on the adsorption, desorption, and kinetic study on Pb2+ removal from aqueous solutions using wood/Nano-manganese oxide composite (WB-NMO). The optimum pH, contact time and temperature for adsorption were found...

Leaching of Lead and Zinc from a Low-Grade Oxide Ore in Citric Acid Media

Leaching of a low-grade lead and zinc oxide ore was studied by an organic reagent, citric acid. The quadratic mathematical models were developed for the relationship among the influential parameters and lead and zinc recoveries. Leaching rate was strongly affected by the interactive effects of factors. It was also found that the quadratic effects of stirring speed and linear<e...

Transient Heat Transfer from a Free-falling Molten Drop of Lead to a Cold Plate

The transient heat transfer rate from a free-falling large drop of molten lead to a cold plate surface maintained at about room temperature was experimentally estimated by solving the inverse heat conduction problem, taking into account the time variation of the area covered by the drop. Furthermore, the change with time in thickness of the solidification layer formed within the drop was estima...

Contribution of lead from calcium supplements to blood lead.

We conducted a case-control study to determine the contribution of lead to blood from consumption of calcium supplements approximating the recommended daily intakes over a 6-month period. Subjects were males and females ages 21 to 47 years (geometric mean 32 years) with a geometric mean blood lead concentration of 2.5 microg/dL. They were subdivided into three groups. One treatment group (n = 8...

Lead and Lead Compounds