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<br />~_ <br />cost effective process for cyanide destruction today and is the <br />only reliable process for slurry treatment. At the end of 1990, <br />there were 32 licenses for the Inco SO,/Air cyanide destruction <br />technology in North America. <br />PLANT PERFORMANCE <br />CIP. CIL or Reoulaed Tailings <br />The Into SO~lAir process is suited for the removal of <br />cyanide from carbon in pulp (CIP), or carbon in leach (CIL.) or <br />repulped leach tailings. This is because reagent consumption iS <br />virtually unaffected by sulfide and oxide ores. <br />Operations which ate currently using the Into process on <br />tailings vary ins size from 400 to 8,000 stpd of ore, In theca <br />operations cyanide destruction is usually carried out in singly <br />stage reactors equipped with suitable agitadoa mechanisms and <br />aeration. With a few exceptions, liquid SO2 is used as it is one <br />of the most economical and available SO2 sources. ~ For <br />maximum process efficiency, the pH is controlled in an <br />optimum range which is dependent on feed solution chemistry <br />and type of ore present in the feed pulp. Typical results are <br />shown in Table 1. <br />Table 1: Slurry Treatment Results <br />(35-50 wt 4o solids) <br />• Feed (mg(L) 100 - 50 CNT <br />10 -250 Cu <br />5-20 Fe <br />• Treated Sluny (mg/L) 0.1 - 10 CNT <br />0.2 - 10 Cu <br />0.1 - 0.5 Fe <br />• Reagents 3 - 6 g SO~(g CNT <br />2-4glime/g CNT <br />0 - 20 mg/L Cu~* <br />2 <br />