I have granulated blast furnace slag (GBFS) and Fly ash. As you can see in the table 2 in the file attached to this question, Sio2 of Fly ash and GBFS are 52.72 and 32.12 and Al2O3 of fly ash and GBFS are 16.30 and 16.41, respectively.
In the next table, you see the amount of Si/Al calculated for mixture design. I wonder if you could kindly let me know how they calculated the Si/Al, 1.47 for instance at the first row, and how they changed it and reached Si/Al = 1.51 in the second row.
Dear Armin,
That's so similar to glass and glass-ceramics calculations; you know the oxide composition of the raw materials (Table 1). Convert your desired compsition also to oxide one (instead of ratios). Now you can start selecting raw materials and understand how much of your needed oxide is being afforded by that selected raw source. Subtract them one by one. Finally, you will see all your intending oxides (according to your mixture) have been afforded by an adequate selection of the sources.
Best,
Sorosh
Hi Sorosh Abdollahi
Thank you for your answer. I have a background in Civil Engineering, and to be honest, I did not fully understand your comment.
Could you please clarify the process somehow that could be easier to understand for me?
Many thanks in advance.
Best
Armin
Hi,
You can calculate in the following way:
1. calculate the no. of moles of each element-oxide or element. You can do that by simplying dividing the weight of element oxide/mol. wt. of element oxide. This will give you moles of element oxide in that particular weight of material.
2. If you need to calculate moles for element, then for eg., calculate weight of Si in SiO2, now divide that by mol wt of Si. This will give u moles of Si.
Similarly calculate moles for all desired element-oxide or element watever is the requirement. Divide the moles of desired element and u vl get Si:Al molar ratio.
3. In particularly, for table 2, they have not given details of SiO2 and Na2O in alkali solution, so the presence of SiO2 and Na2O in the solution will affect your molar ratio. Find out the elemental compsition of the liquid solution. Calculate moles in the above suggested way.
4. Add all the relevant moles of elements and divide as per watever ratio you are looking for. (eg. add all moles of Si (in precursor and alkali solution)/ add all moles of Al (in precursor and alkali solution) this will give you the final Si/Al molar ratio (mentioned in table 2 under Si/Al)
I hope i have explained it to you in a simple manner.
Let me know if you neeed any help
Thanks and All the best
Leena vachasiddha
Leena P Vachasiddha thank you so much for your answer. It really helped.
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