C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/12 (2006.01) C22B 3/14 (2006.01) C22B 11/08 (2006.01)
Patent
CA 2051698
The recovery of noble metals by sodium cyanide leaching from complex refractory gold and silver bearing ores containing such complex silver sulphides as polybasite, pearcite, pyrargyrite, tetrahedrite and argentite presents difficulties in that the precious metal is trapped inside the refractory matrix of the mineral. Pretreatments such as roasting, acid pressure leaching and biological leaching are capital intensive and to obviate this disadvantage, the use of an alkali/alkaline earth metal peroxide is applied as an additive, in an amount ranging from 0.1 to 5.0 kg/t. Preference is for calcium peroxide, which is more stable, consumes less cyanide, is simple to use and monitor, and enhances the process and recovery by improvement in leach kinetics.
La récupération de métaux nobles par lessivage au cyanure de sodium à partir de minerais réfractaires complexes d'or et d'argent, renfermant des sulfures complexes d'argent - polybasite, pearcéite, pyrargyrite, tétraédrite et argentite - présente certaines difficultés du fait que le métal précieux est piégé à l'intérieur de la matrice réfractaire du minéral. Les prétraitements, comme le grillage, le lessivage acide sous pression et le lessivage biologique, sont des procédés coûteux; pour contourner cet inconvénient, on fait appel à un peroxyde de métal alcalin ou alcalino-terreux, qui est appliqué comme additif à raison de 0,1 à 5,0 kg/t. On privilégie le peroxyde de calcium, plus stable, consommant moins de cyanure, plus simple à utiliser et à contrôler, et facilitant le procédé et la récupération grâce à l'amélioration de la cinétique de lessivage.
Chouzadjian Kevork Avadis
Roden Stephen James
Smith Trevor John
Spieth Michelle Anne
Cra Services Limited
Kirby Eades Gale Baker
LandOfFree
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