Note, Dr. Parkhurst tome me the x-axis on his graph should be in columns and not length. 

Kinetics: 16293000000000 seconds in 100 steps 

Advection: 10 cells at 3.15e8 seconds with 15 shifts.  

K-felspar is plentiful but has a long lifetime in normal conditions.  In China, the reacted K-Felspar: 

"Our experiments demonstrate that, after adding calcium chloride hexahydrate as an additive, the K-feldspar can be transformed to Ca-silicates at 800°C, which can easily mineralize CO2 to form stable calcium carbonate and recover soluble potassium. The conversion of this process reached 84.7%. With further study," 

The obvious problem is the energy required for reaction, but the conversion is quite nice. 

In my case, I created the above graph at 200 deg C and pH ~9.0 at start. I also reacted albite. This was an assignment problem from Dr. Walt McNab of Berkeley. 

The shifts are the number of times the water passes through the cells at each step. 

I am learning PHREEQC, PHAST, and their incorporation with Python, so that I can apply it to enhanced soil weathering, ex-situ CO2 mineralization, potential optimization of particle size for weathering (250-270 in code) and pollution. Obviously, I would consider a more realistic mineral for EW.  In addition, If I can find the composition of a geological storage site, I can model how in-situ injection of   CO2 and its effect on the different rock weathering. I am retired and it is something to do. The Reddit link is my code and graph that matches Dr. Parkhurst and verifies I did the model calculation correctly. For the code, I forgot to change the 1-30 to 1-10 since 10 cells were used. It had no effect on the results. 


References: 

[1] Xie, H., Wang, Y., Ju, Y., Liang, B., Zhu, J., Zhang, R., Xie, L., Liu, T., Zhou, X., Zeng, H., Li, C., & Lu, H. (2013). Simultaneous mineralization of CO2 and recovery of soluble potassium using earth-abundant potassium feldspar. Chinese Science Bulletin, 58, 128-132. https://doi.org/10.1007/S11434-012-5466-7.

[2]