Dear Mr.Silastman,

Benefited means we all will get more knowledge about beneficiation of chemical gypsum by chemical treatment.

Regards,

Raj Sahu

Dear Raj Sahu,

I see. My investigation connect not only with chemical treatment of chemical gypsum, but with complex treatment - mecanical (highe pressure) & chemical. I find, that under pressure change pH, thermodinamic & structural properties of gypsum. Use of this knowlege, I can lowering energy consumption on manufactoring of gypsum & cement, making highe strength & water proof gypsum & new solid phase, low temperature synthesiring Portland cement.  I'm upload this articles on next week.

Silastman

Main question of this topic. Begin of hardening of cement with simple lime treatment phosphogypsum is more than 10 hours. In order to lower this time, before pressing in phosphogypsum with lime add Al(OH)3 or Fe2O3. Under pressure in gypsum formated 3CaO Al2O3 CaSO4 10 H20 or 3CaO Fe2O3 10 H2O. This minerals lowering time begin of hardening of cement up to 2 or 3 hours. 

Silastman

Not publish article about Fe2O3 dust with chemical gypsum.

https://rapidshare.com/files/2129985637/Vlianie_koloshnikovoy_puli.pdf

PS If you want publish this material, please sent me message.