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GENERAL47956
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Last modified
8/24/2016 8:23:30 PM
Creation date
11/23/2007 3:58:14 PM
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Template:
DRMS Permit Index
Permit No
M1988112
IBM Index Class Name
General Documents
Doc Name
THE RECOVERY OF CYANIDE FROM SLURRIES
Media Type
D
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Page 20 <br />Once a sdutlon or slurry Is deposited In an Impoundment, every attempt should be made to configure the <br />impoundment to enhance natural degradation, thereby reducing the concentrations of cyanide and metals <br />requiring treatment The design of fallings Impoundments to enhance natural attenuation or degradation has <br />been practiced successfully In Canada for several years. <br />Iri the event excess,decant water must be discftarged and natural attenuation atone or in con)unction with <br />cyanide recovery cannot yield an acceptable effluent, addRiortal treatment Is required. in this Instance, the <br />residua! cyanide and metals concentrations wUl have been lowered sufficiently to allow the use of <br />conventional bldogical or chemical treatment to achieve the desired efftuant quality. The lust choice u <br />bldogicai treatment, where applicable, due to Ks simplicity, perfomtance, and low operating costs. In the <br />event bidoglcal treatment is not practical, due to tow temperatures, then selection d one of the chemical <br />treatment processes is necessary (i.e. hydrogen peroxide, sulfur dioxide, or chlorine). The use oT <br />conventional chemical treatment processes are expensNe when treating slurries or sdutioris containing <br />elevated cyanide levels. to addRlon, process performance is open not sufficient to reduce elevated Influent <br />concentrations to environmentally acceptable levels. However, these processes are welt suited as <br />downstream treatment alternatives once the cyanide and metals concentrations have been reduced through <br />cyanide recovery. <br />Water management and wastewater treatment at a mining operation demands an integrated approach, to <br />minimize the generation of poor quality water requiring treatment. No single solution can sdve every water <br />qualhy problem at a mining facility. <br />There are several additional cyanide recovery processes on the market or under development. In most <br />cases the processes Invdve an Intermediate cyanide concentration step (i.e. Ion exchange) which <br />slgn~cantly Increases both the cost and complexity of the recovery operation. Many of these processes <br />are In the pilot plant or bench scale testing phase and have not been utilized in a full-scale design. <br />The recovery of cyanide lrom solutions is a well established process, resulting in substantia capital and <br />operating cost savings while minimizing persistent cyanide disposal and environmental problems. Attention <br />has shifted to the recovery of cyanide from slurries, as this application provides significant environmental <br />as well as economical benefits. <br />Fdlowing detailed laboratory and pilot plant evaluations, the recovery of cyanide from slurries has been <br />~: ~.`-: demonstrated. The information would be employed In the first full-scale process for the recovery of cyanide <br />" from slurries at the Gdden Cross Mine operated by Cyprus Gdd of New Zealand. The Cyanisorb Process <br />~_.`:. _ .tor which a patent Is pending would be In operation at the mining facility In the fall of 1990. _ <br />REFERENCES <br />(1) Lawr, C. W., 'Cyanide Regeneration or Recovery as Practiced by the'Compania Beneficiadore de <br />Pachuca', Technical Report No. 208.8-20, American Institute of Min.. Metall.. and Pet Engineers, <br />1929. <br />(2) Davies, D., Robertson, D.J., Kirkwood, W., and Goodman, J.,'Cyanide and Regeneratic n Plant and <br />Practice at Flln Flon', ins. Can. Inst. Min. Metall., Vd. XL1X, pp. 130.142, 1946. <br />(3) McOulston, F.W. and Shoemaker, R.S, 'Gdd and Sliver Cyanldation Plant Practice Monograph', <br />Amer Inst. Min.. Metali.. and Pet. Engineers. <br />(4) Dorr, J., ~anldation and Concentration of Gdd and Silver Ores, McGraw Hill, New York, 1936. <br />
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