Laserfiche WebLink
<br />FMC Carparation <br />Rerearoh and,Development <br />Priricicton, Ner Jersly . <br /> <br />-:~` cpcJs-as-cis <br />' _ page 6 <br />system or by lajaatioA o! H~oa direotly into flee top layer of the pond <br />preterablY ab its deepest point. <br />The rats o! the It71D8 Cx' detoxiliaation reaction was rill{tiveiy last <br />ae~pared to several other tailings Mates's !!SC has teste4 In the last <br />!w years. This hel trw in both the clear .soiatioa aAd the slurry. <br />Table i. ITO oatalys~ vas seeded. The . high oopper level ! the pond <br />rater and •IurrY uadoubttdiy aontribated to the last rsaet~on rates. <br />Ths pR was reduced Eros 9.0 to 8.i~i.6 Sn the slurrioa and from i.i to <br />7.4-T.6 Sn the pond watsr altar H~Oa treatme»t. <br />COODer <br />Mhil• the olear coiorlaae pond rater vas being detoxdfiod rith <br />hydrogen peroxide, a turbid ~eeriish Aafe developed. Ait~i standing <br />for a few hours, the •elu ioa becese Discs again cold a gqreen <br />precipitate settled to the bottola of the ooAtainer. The ~rsaipitate <br />contained Di.D• copper (atonl.o amisaion aethod) and th aolutian <br />aAowed a dramatic drop in copper ion aonasAtration. Thi• p enosena is <br />the result of the H2oZ attacking and doatseying the cope r cyanide <br />((NADi C1P-). OACS the cyaaids xas destroyed, the copper i na formed <br />insoluble copper hydroxide. The a~apunt o! copper reatovsd fr solution <br />ra• proportional to the amount of Rloz adaeodd and oorrelatedl rail rich <br />the amount of cyanide removed. Compare ligura 1 rith Piqure 2. <br />Teets ooriduatsd on the clear tap layer of the tailings slurry shored <br />only i ppm Dapper ramaininq altar treatment rith a SJi rt ratio of <br />8109/C!Q- compared to an initial copper concentration of ?60 ppm <br />(Pigure 2). <br />The support end aoopsration of the various Eattl• lit. Gold psrsonnel <br />is eppreoiatsd. <br />lrrepared bye <br />l-pproved by: <br />Deltas `~~, F, 1~ p~- <br />Datet L ! t L <br />fTer as an a• <br />