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<br />loco process. For temporan installa• S+CI,i(I/t (SCI.It; per sU. One n( the centspcrlhtS(L. These costs are highly <br />'ions such as required (or heap rinsing. main advantaees of the Into SOJAir competitive with the costs of hydrogat <br />ne capital cost can he minimized M' ,, which is <br />process is the low cost of S(1 peroxide. chlorine, sodium or calcium + <br />converting the existing barren solution _ <br />available in mam fomu. The least h~~pochlorite or chlorine dioxide. <br />Hood into the SOJAir reactor. -fhe S0, expensive is roaster gas (when aVall- <br />,elivery system can be leased aid onlj able) and. in increasing order of cost. Licensing fees <br />requires the ins[allation of a Deliver elemental sulfurbumine, hyuid S0, and and Inco services <br />line. Airblowerscan also be leased and sodium sulrue or sodium metabisulfite. The Inco SO,/Air process is proptie- <br />existinglime(orcausticisystemscanbe Hope Brook implemented theSOJAir tar) technologj and does require a li- <br />used for pH control. process in late ] 990 converting from a tense before use. The licensing fees are <br /> previous H.O, s~ stem. It is the first structured such that they do not offset <br />Operatingrnsls plantusin~anelemenralsulfurbumerto the cost benefits of the Inco SOJAir <br />Operating costs including reagents. produce 50:. The capital cost of the process relative to o[heroxidationpra:- <br />fabour,electricpower.maintenance and sulfur burner should be recovered in six esses. <br />licensing fees vary between 10 cents to months as a resul[ of reduced operatin_ Licensinn fees are negotiated based <br />~C1.75/t (9 cents to 5C 1 SS per st i of costs over the use of liquid SO,. on the lower of reagent consumption or <br />Jre. Prices vary depending on location. In a small traction of the gold and silver <br />Theloweropera[ingcos[sarefortreat- Canada, though. liquid S0. can be ob- extracted b~• cyanidation. <br />mentofpondwa[erwherctheadvanta~e rained at [2 to 2~ cents/kg (5.5 to 11 <br />~f na[unl degradation can be [aken. A cents per Ibl SO,: S0, from elemental References <br />:~~pical operating cost for a plant treat- sulfur at 7 cents%kg SG. (3 cents per Ibl Bam.nY~GJ.. s:si.. t79< -Crmm.nmovetnomaoverus , <br />' <br />mg CIP tailin s using li uid S0. is <br />g y _ and metabisulLte at 77 centslk~ (35 <br />r Gnaa~an omen L+65.O~. apr111t1. 1Yea.Gm <br />sveams. <br />ens ov us worn asazoea. rwp. zr, toes. <br />~~O Rcprintedfrmn MINING ENCINEli:R1NC. February 1991 <br />