Solid neutral grounding systems

Solid neutral grounding system (also known as effectively grounded system) 20/664... 

When the neutral of the system is grounded solidly or through a small impedance (Section 20.4),... 

When the system is grounded through its neutral, either solidly through a resistance or through an arc suppression coil (inductor), it becomes a grounded neutral system. This type of system grounding may be classified as follows ... 

Figure 11 Measured dissolution rate for plagioclase from Panola granite, Georgia, USA compared to published dissolution rates of other plagioclase samples. Panola plagioclase was dissolved either as fresh unweathered samples, or as naturally pre-weathered samples (see text). Also plotted are dissolution rates for plagioclase under ambient conditions in the laboratory at near-neutral pH for freshly ground samples from other localities (solid symbols) and for samples weathered naturally in other field localities and then dissolved in the laboratory (open symbols). All rates were normalized by BET surface area. Dashed line is a fit to all field and laboratory data, including field data from systems weathering for periods of time 1 yr (data not shown). Figure adapted from White and Brantley (2003), and all data are attributed in that paper.

In agitated tank leaching systems, finely ground ore must be mixed with the lixiviant until the reaction is complete. Liquid/solid separation processes are used to recover the solution and prepare the waste for disposal in a tailing impoundment. Unlike percolation leaching operations, these operations require a large impoundment area to not only handle the solids, but also to neutralize the chemistry and pH of the solutions used to extract the metal value. 

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