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Research
and Commerical Application of Gold Extraction
by Bacteria Oxidization and Cyanidation
The gold extraction process by
bacteria oxidization and cyanidation is to oxidize
the sulphide minerals in the ore under suitable
conditions by microbes that exist in nature and
are cultivated and acclimatized to liberate the
gold minerals, and then cyanidatiion gold extraction
is carried out. It is one of the effective methods
for the pretreatment of refractory gold ore with
arsenic content.
This achievement was completed depending on our
own technical strength under the National Key
Scientific and Technology Project of The Ninth
Five Year Plan, “Research on the Development and
Utilization of Refractory (for Mining, Mineral
Processing and Smelting) Gold Mine Resource”.
Based on the characteristics of the refractory
arsenic gold ore in this country, HY35-1 ferrous
oxide thiobacilli with higher vitality, stronger
adaptability, and quicker oxidation was selected,
cultivated and accliminated. During the course,
12 kinds of refractory arsenic gold concentrates
were studied for bio-oxidation gold extraction,
through which lots of technical data and parameters
were obtained, and the two step oxidation method
that may be used to quickly oxidize those gold
concentrates that contain arsenic over 10% or
sulpher over 20%, or with high content of harmful
impurities, extrafine, and occladed occurrences.
This technology has made obvious economic achievements
in commercial operation as its first case in Shandong
Yantai Gold Smelter. Applying this technology,
our institute undertook the demonstrating project
of high-tech industrialization entrusted by the
formor National Planning Committee --- the design
and construction of Liaoning Tianli 100 tons/day
Bio- Oxidation Concentration Plant. The research,
design, and construction work of this plant was
independently carried out by our institute, and
we own the all the interlectuell property.
The process of two stage bio-oxidization gold
extraction has won the gold medal for invention
of 2003 London International Expo, and we have
made application for invention patent of to the
Chinese authority.
（Liaoning Tianli 100 T/d Biological Oxidation
Plant）
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