PhreeqcUsers Discussion Forum

Beginners => PHREEQC Basics => Topic started by: Ash on July 06, 2017, 06:27:41 PM

Title: uranium leaching
Post by: Ash on July 06, 2017, 06:27:41 PM
hello
I am using sulphuric acid solution(50g/L H2SO4 solution) for leaching of uranium from  a rock sample. I need to find
how much uranium is leached out at equilibrium using phreeqc. How can I do this ? how to include sulphuric acid in the SOLUTION block ?  Do the reactions between uranium and sulphuric acid need to be incorporated in the code ?
Thank You
Title: Re: uranium leaching
Post by: dlparkhurst on July 06, 2017, 08:32:02 PM
Here is a rough calculation using 10 mol/kgw sulfuric acid and uraninite. In this case, most of the uranium would dissolve, but there are many real-world factors--the U minerals present, other reactive minerals, the availability of oxygen, the rate of reaction, and the amount of contact between the U minerals and the solution.

SOLUTION
-units mol/kgw
pH    0 charge
S(6)  10
EQUILIBRIUM_PHASES 1
    Uraninite(c) 0 10
    CO2(g)    -3.4 10
#    O2(g)     -0.7 20
Title: Re: uranium leaching
Post by: dlparkhurst on July 11, 2017, 02:35:27 PM
I don't like the solution definition that is not charge balanced. Further, I doubt all of those minerals are in equilibrium. And what mineral is Ca? So no, I don't think the code is correct.
Title: Re: uranium leaching
Post by: dlparkhurst on July 12, 2017, 09:23:12 AM
pH 0 charge