[philipkglass]

You're probably thinking of this paper from 2007:

"Electrochemical Acceleration of Chemical Weathering as an Energetically Feasible Approach to Mitigating Anthropogenic Climate Change"

https://pubs.acs.org/doi/10.1021/es0701816

It was mind blowing for me at the time! Subsequent approaches to accelerated silicate weathering like Project Vesta dropped the chemical component and just used mechanical crushing of rocks to accelerate weathering. The all-mechanical approach is less complicated and energy intensive.

[LarsAlereon]

If you're extracting chlorine to react it with rock it probably makes more sense to just react the rock directly. But if you can use the chlorine industrially it makes more sense not to involve the mining and transport of rock. There's currently a significant industry of chlorine and HCl production that isn't linked to a carbon sequestration process that we can supplant.