Need very fine particles for that and its usually classed then as ocean alkalinity enhancement (OAE). A hybrid method has been proposed in the literature, to use beaches and is currently being implemented via a project I started (but which I am no longer with) that has been turned into a company called Vesta -> https://vesta.earth

Rolling stones; fast weathering of olivine in shallow seas for cost-effective CO2 capture and mitigation of global warming and ocean acidification https://esd.copernicus.org/preprints/2/551/2011/esdd-2-551-2...

https://smartstones.nl/research/publications-2/