Biomedical Engineering Reference
In-Depth Information
Chapter 20
P
URIFICATION OF
K
AOLIN OF
D
IFFERENT
G
RADES
WITH
A
PPLICATION OF
S
ILICATE
M
ICROORGANISMS
L. I. Zaynitdinova,
*
S. I. Kukanova,
A. A. Ismatov and I. V. Lobanova
Institute of microbiology, Tashkent, Uzbekistan
A
BSTRACT
Model tests on iron removal from primary kaolin of Angren deposit with application
of Acidithiobacillus ferrooxidans K-1 and silicate microorganisms by two-stage scheme
were conducted. Decrease of iron content in form FeO till 0.2% and Fe
2
O
3
till 0.27% was
established.
Application of microorganisms in purification processes of kaolin of AKS grade
allowed to decrease content of Fe
2
O
3
till 0.23% and to improve its technological
properties.
Keywords
: Kaolin, silicate microorganisms, Acidithiobacillus ferrooxidans, micromycetes,
organic acids, iron oxides
Iron oxides present in kaolin, quartz sands and soil in form of impurities may
considerably decrease quality of raw materials. Different non-biological methods are used to
remove iron. But, some of these methods, like magnet separation and flotation, are not
suitable for universal application and their efficiency to great extent depends on properties of
ore materials to be processed.
Chemical methods based on minerals leaching by organic acid and treatment by
reductant. They are usually used for removal of high quantity of iron; but, at the same time,
they are more expensive, processing conditions are harder, and process is not environment
friendly.
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