| Studies on Beneficiation of Kachch Sandstones |
R. B. SUBRAMANIA., B. B. MACHIIOYA, D. R. VYAS,
B. G. SonTRA A.DT. K. DMI
Pages : 113-117
DOI : 10.1080/0371750X.1992.10804554 |
| Abstract |
| Foursamplesofsand!>1one collected from AnjartalukaofKachch
district, Gujarat State, India were studied to develop applicable
beneficiation routes. The sandstones were friable In nature, off
white to white in colour, as.iaylng from 90 to 96% silica content,
with minor amounti of AI20J (1.5 to 5.0% ), CaO (0.90 to 3.40% ),
trace amounti of TI02 (0.13 to 0.28%) and Iron oxides (0.10 to
0.35%). Petrography and XRD analyses revealed clay, feldspar
and calcite as the major Impurities. The samples were crushed
and sieved into various size fractions. Sizing followed by attrition
scrubbing with water as medium brought down the Iron content
from 0.17 to 0.10%. Scrubbing with mild alkali/acid medium
further reduced it. The most Impure sandstone sample was
further Investigated to explore the possibility of beneficiation.
After sizing the crushed sand with a nest of sieves, the coarse sand
fraction retained on 500 11m sieve was attrition ground with
pebbles and sieved again. The ground sand along with the medium
fraction paising through 500 11m sieve but retained on 125
jlm sieve wai scrubbed with water. The Iron content was brought
down to 0.05% with further chemical treatment. The resultant
sandstone product conformed to Grade I glass sand of the relevant
Indian Standards Specification. |
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