Re: Quantitative Analysis of CaO in the mixture

lms7832@xxxxxxxxx wrote: 
Dear

I have powders which is mixtures of CaO, CaTiO3, CaCO3..

Then I'm not sure the percentage of CaO in the powder.


Is there any easy way to find that?

I think that only CaO react with water and then convert into Ca(OH)2.

But other component is not react with water.

By using this chemical reaction, I'd like to measure CaO content(%) in
the powder.

Does this method make sense?

Please give me some advices. 

Thank you.


An easy way to estimate CaO, CaCO3 and CaTiO3 would be to :
1. Disperse the powder in water and sparge CO2 into the slurry and stir for several hours or overnight- dry the slurry then heat the powder to a temperature well below the decomposition temperature of CaCO3, but high enough to remove hydrated water (remember TiO2 will facilitate decomposition to CaO or some calcium titanate phase) - measure the weight gain..
The CaO will carbonate and gain weight.

2. Calcine the powder at 1000 C and measure the weight loss - all the CaCO3 will convert to CaO

The remainder will be CaTiO3 (provided that the stoichiometry of your starting CaTiO3 was 1:1)

If you have a large high alumina crucible - you can carbonate directly in the crucible and avoid transferring the slurry back and forth from a beaker.

I would recommend using a high alumina crucible that will not react with the CaO. It will be a lot easier to clean and reuse than porcelain.

Good luck,
Gregg
.

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