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<br />ff(C Corporation <br />Research and Dawlopment <br />Princeton, New Jarasy <br /> <br />CpCr/a=~7-012 <br />Paga• <br />cattle Ott Qoid dasirsa to raduos the high lavsl (290 ppa) of vaakly <br />acid disaoaiabia aayyaaaaidas (MSds CN') in Chair 37 aillioa gallon ban <br />Lui• Colorado tailiaQs goad to a target level O! batrasa a' ppm to ao <br />ppm t-ad. tx'. aamplaa o! tailings slurry and olaas poad 1-atar vara <br />seat to,!liC~• iaboratorias is Prinoatoa NJ !oz ari avaluatiba of 8202 <br />as a wl-~8 C!t' traatmtat option, <br />a~hi. mill ooa.aaa a, o0o ary toaa ore/day. satw•aa i, zoo~l,aoo 3p1[ <br />slarsy containing an awraga .o! a80 ppa 11ads Clf- + !r~a Cx' is <br />ditohargad to the taillrsga pond. ltowawr, a sample of tailings slurry <br />shipped to Prinaeton had a higher rhea awraga wads CN' co aatration <br />O! 76o ppm. <br />Uncatalyaad hydrogaa peroxide a!lectivaly datoxiliad the N1~Di CN' in <br />both the clear pond and tailings slurry saaplas race iattia Kt. Ooid. <br />Ccyyanide daatructien up to/or Haar non~datactabl• lava33JJc can be <br />obtaiaed b!' using au!!loiaat 8203. The wads CN- lawi vu r~uoad from <br />as initial lwal of 290 ppm in the nlaar pond avatar to batwr n 7a ppm- <br />8 ppm wAD/ C2T' naiaq S.a/1 and a/i wt ratios of $ZO13/CH' rar ativaly. <br />The Nads CN' lawl was reduced lrom ari Initial lawl o! 7so pm in the <br />tailiags slurry to batwan 7S ppLt~70 ppm~1 ppm uadar sti ad and/or <br />unstirred oonditlona using 1/1, 2.aJ1 and S/1 xt ratios of 8 03/CN'. <br />Concurrently with the raduotioa ist IP71Da CIP' lawis, solutlla aoppar <br />eonoantrations Ware reduced from laitial oonaaatrationa o! 1 0 ppm and <br />360 ppm in t)ss goad and slurry samples to 9 and eD ppm ra paotivaly <br />vaiaq a/1 et ratios 8301/CN'. 8y incraasinq the H2o2/CN" ratio to <br />b/1 with ttsa slurry ra~tpla, the copper aoneaatratlon was re uaad to i <br />pPm~ <br />Ph rsductione of only 0.5 to 0.9 units rasultad.trom 8202 aQditiOn to <br />the pond water and tailings alurry. . <br />1. Tv lower the a%ictinq w]-DS CN' convantration in th• ppnd, H2O <br />should ba added t0 the Clear pond water until an acceptalbla lava <br />of wADa CN' is reached. The quantity of 8 OZ viii dapa~d on the <br />amount of natural degradation and volatilisation ae wall as the <br />