A Silica/Fly Ash-Based technology for Controlling Pyrite Oxidation. Page: 4 of 22
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The leaching columns were placed in a field located close to our laboratory at the University
of Kentucky in Lexington, Kentucky. The leaching columns were constructed from polyvinyl
chloride pipe with a height of 46 cm and inside diameter of 15 cm. All columns were fitted with
drain tubes and one gallon polypropylene jugs to collect the leachate and supported in the field by
wood benches (Fig. 1).
K,- 15 cm - .
/ Spoil or Tailings
uz - - - ---
Drain Drain tube
Figure 1. Diagram of an outdoor leaching - column.
All of the columns were filled with a 50 mm layer of sharp sand on the bottom, followed by
either the spoil or tailings mixture described below, and a 50 mm layer of sharp sand on top. For
the 113.5% potential acid neutralization column group using the Canadian tailings, control
columns were filled with a uniform mixture of 0.5 kg Canadian mine tailings and 9.5 kg of sharp
sand. All other columns in this group used a uniform mixture of 0.5 kg tailings, 9.5 kg sharp
sand, and 0.8 kg agricultural limestone. The purpose of the sand was to improve hydraulic flow
through the columns and the limestone was the amount required to neutralize 113.5% of the
potential pyritic acidity.
Wood bench support
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A Silica/Fly Ash-Based technology for Controlling Pyrite Oxidation., report, September 21, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc691633/m1/4/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.