Re: Lime-treated Gypsum -Page 4 of 7 from International Cement Review

Raj Sahu 28/08/2011 06:57:05

Dear Mr.Ted,

Thanks Ted,

You may read various methods ("The nature of Phosphogypsum Impurities & their influence on cement hydration" by Tabikh A.A. & Miller F.M.,Cem Concr Res 1,6;1971 ,663-78) including washing with water and neutralization with lime water have been suggested to modify the quality of Phosphogypsum so as to remove the impurities or reduce their level.It is clear that neutralization of the chemical gypsum takes care of only free acid impurities by making them inactive but does not change the state of lattice-bound impurities.

Raj

Ted Krapkat 01/09/2011 00:45:24

Hello Raj,

Thanks, that sounds like an interesting paper. I'll try to find it on the Net and have a look.

Regards,

Ted.

Silastman 05/09/2011 12:57:16

Raj Sahu:
It is clear that neutralization of the chemical gypsum takes care of only free acid impurities by making them inactive but does not change the state of lattice-bound impurities.
Raj

Quite right. This one is my artcile by this problem.

https://rapidshare.com/files/1605648732/Features_of_manufacture_of_an_artificial_gypsum_stone.pdf

Unfortunately this one on russian. You can translate it on mechanical translator. I'm wright 3 or 4 articles by this problem. If it interesting, I can upload it.

Silastman

norew 07/09/2011 11:18:08

Please do upload it. Thanks in advance.