Issue: removing through dissolution a thin (2-4 mm) iron carbonate crust covering fossilized bone without damaging the bone. Microblasting with conventional baking soda ineffective; removal of iron carbonate with mini-pneumatic air chisel also removes top layer of bone with the iron carbonate crust. Any solutions would be appreciated.
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Expert's answer
2018-03-01T08:47:10-0500
On heating FeCO3 FeCO3 = FeO + CO2 CO2 gas and is remove FeO has heigh melting point , decrease melting point by the use flux SiO2 FeO this oxide is formed slag with SiO2 FeO + SiO2 = SiFeO3 Here FeO act as impurity and SiO2 act as flux formed a fusible product which is separate out from Bones
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