https://www.nature.com/articles/d41586-023-02032-7
Scientists are proposing to add silicate minerals and other antiacid minerals to generate alkalinity that will capture atmospheric CO2 and decrease ocean acidification according to the following reaction:
Several issues to fix before large-scale application of this technology are reported in this paper. In addition, the release of silicic acid may stimulate diatom productivity with unknown implications on the effect of reverse weathering in sediments, which may produce acidity, once the diatoms have settled to the seafloor. More work by other groups is underway to help diagnose this potential carbon capture mechanism.