Dewatering: Thickening, Filtering, CCD, Water Treatment & Tailings Disposal

Dewatering: Thickening, Filtering, CCD, Water Treatment & Tailings Disposal2017-04-04T06:57:46-04:00
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Cyanide Loss in Ponds (2 replies and 1 comment)

Billy
3 years ago
Billy 3 years ago

Hi all, anyone could share how to quantify cyanide loss in ponds due to UV and HCN volatilisation!? Thanks

Paul Morrow
3 years ago
Paul Morrow 3 years ago

A UV light shined on top of the liquid being ozonized caused some increase in reaction rates, but substantially faster reactions occurred when the UV bulb was totally immersed in the aqueous medium being ozonized. The UV light source used drew 4 watts and produced 253.7 nm wavelength UV light. Using this combination of UV with ozone at various concentrations (from 1% to 5% by weight) in the carrier gas, substantial increases in cyanide destruction rates were obtained. For example, the initial reaction rate of VI ozone with UV light in a solution containing 53 mg/1 of bleach cyanide was about equal to that obtained with 5% ozone without UV light, until a cyanide concentration of about 16 mg/1 (70% conversion) was obtained, after which the reaction rate with 1% ozone with UV was far superior to that of 5% ozone without UV (Figure 19).

Read https://macsphere.mcmaster.ca/bitstream/11375/12095/1/fulltext.pdf

and https://books.google.ca/books?id=X30KtbGpEwgC&dq=cyanide%20destruction%20rate%20uv%20light&pg=PA213#v=onepage&q&f=false

https://books.google.ca/books?id=W3-vHD3bUQEC&lpg=PA194&dq=cyanide%20destruction%20rate%20uv%20light&pg=PA194#v=onepage&q=cyanide%20destruction%20rate%20uv%20light&f=false

https://books.google.ca/books?id=q3PLBQAAQBAJ&lpg=PA461&dq=cyanide%20degradation%20rate%20uv%20light&pg=PA461#v=onepage&q=cyanide%20degradation%20rate%20uv%20light&f=false

Billy
3 years ago

Thanks Paul....actually I am looking information about cyanide loss due to UV from the sun....

David
3 years ago
David 3 years ago

Billy, you certainly did not read the 389 PDF nor any of the links Paul gave you.

The 1st PDF mentions 'sunlight' 10 time and UV over 100x.

KINETICS OF NATURAL DEGRADATION OF CYANIDE FROM GOLD MILL EFFLUENTS

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