The Test
and Research on the Treatment of Cyanide-containing
Wastewater by Oxidation of Hydrogen Peroxide
1. Brief Introduction
Hydrogen peroxide oxidation process is a new technique
for treament of cyanide-containing wastewater.
Changchun Gold Research Institute has done a lot
of tests and research on this technique. Based
on large amount of technical data obtained, secondary
profound treatment of the acid tailing solution
of Shandong Sanshandao Gold Mine was conducted.
The acid tailing solution treatment of Sanshandao
Gold Mine in its original design was by means
of alkaline chloridatin process, which has the
following disadvantages: higher treatment cost,
unable to eliminate the ferrocyanides in the wasterwater
which can be easily decomposed into toxic free
cyanide under sunshine and produce extra chlorine,
causing secondary pollution; unstable indices
of treatment; and complicated operation. While
using hydrogen peroxide oxidization process, it
achieves good effect of cyanide removal with low
treatment cost, the ferrocyanides in the wastewater
being effectively eliminated without noxious intermediary
products, low investment, simple equipment, and
easy operation. Using this technology for further
oxidizing treatment of cyanide-containing wastewater
is the first in China.
2. Main Techno-economical Indices
The commercial application indices in Sanshandao
Gold Mine are: removal of cyanide reached at greater
than 99.5%, and the cyanide content at the discharging
outlet of the plant was less than 0.5mg/L after
a single treatment, fully conformable to the national
standard. The consumption of perhydol was 1~1.5L/m3,
and the operation cost was 7.9 yuan/m3, decreasing
by 55% compared with previous process, which may
save 490,000 yuan of treatment cost every year.
3. Application Prospects
At present this new technology has been applied
in Shandong Luoshan Gold Mine and made great economic
profits. It has also promising application prospects
in handling of the cyanide-containing wastewater
from the process of whole slurry cyanidation.
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