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<br />ferrcus sulphate reach 97.20 and 98,8; respectively. Again, one can see that <br />' soluble Fe remains at 40 ppm when ferrous sulphate is used but drops to ? ppm <br />' when V6 is used. <br />~ Figure 3 compares V11 to ferrous sulphate when the starting slurry contained 75 <br />' ppm CN Even though, after 24 hours the results are similar, in the initial <br />stages ferrous sulphate is more effective as a kill agent. <br />' One field test was run with the same gold producer at their plant in Nevada. <br />Unfortunately their tailings pond is very small, with an estimated 4-6 hour <br />retention time, so the eventual ppm CN remaining in the pond is higher than <br />might normally be expected. In addition, the field trial was run Hith V11 when <br />' V6 would have given much lower CN levels. However, the results Of the 3~ day <br />field trial are very close to those predicted from the laboratory results, see <br />Table 1. <br />Using V6 instead of V11 would have lowered the CN ppm to approximately 10-15 at <br />the pond exit. <br />' USE IN HEAP DETOX <br />Leach column tests will commence in late February 1992 in three laboratories, two <br />' of which will be in the laboratories of gold producers. <br />For this application, where CN kill time is less important than it is in <br />' tailings ponds, BEI shall use V11 because it is non-oxidizing amd lowers Fe <br />levels, in addition perhaps to lowering other heavy metal levels. <br />1 <br /> <br /> <br /> <br /> <br />J <br /> <br />