On 08/02/2021 10:23, Theo wrote:
Martin Brown wrote:
Snake oil. You would need to manufacture and handle it in enormous
quantities to store enough energy to be worthwhile. Liquid bromine is
the first thing that springs to mind with about that density. But it
doesn't match the non-reactive/non-corrosive tags.

Barium sulphate is used as a component of drilling mud because it has a
density 4.5x that of water. Mud ponds are something the oil industry already
knows how to deal with, although they aren't pretty. Drilling muds overall
go up to about 2.4x

It sounds a bit like the oil industry is in decline they're looking for a
new market for their existing product. Pumping drilling mud is something
they already do at scale.

Although it's really hard to compete with 'free' water. I wonder how big a
tank you would need for a decent sized battery at average UK hilliness?

Theo

Trivial to do the sums, all the dimensions for Dinorwic are in the
public domain, just add their magic density factor.