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Great question.  The use of Thorium as a fuel in nuclear reactors is a great idea.  Not only is Thorium safer than Uranium the spent fuel is greatly reduced and it is recyclable.  But exactly how to safely produce liquid Thorium is a little more involved.

Rather than me trying to explain it let me just refer you to this source on the internet : http://energyfromthorium.com/essay3rs/

"Liquid-fluoride reactors are based upon the use of dissolved actinide fluoride salts in a carrier medium of low-absorption fluoride salt solvents. The most common formulations that have been considered and demonstrated for this mission are solvents based around low-melting point mixtures of beryllium fluoride (BeF2) and lithium fluoride (LiF) isotopically enhanced in the more-abundant component lithium-7. The actinide fluorides most commonly employed are thorium tetrafluoride (ThF4) and uranium tetrafluoride (UF4). LiF-BeF2 salt mixtures have very low neutron absorption properties, excellent heat capacity, stability under intense radiation, and the ability to dissolve appreciable amounts of thorium or uranium tetrafluoride."

I hope this has helped answer your question.