Connecting pipe, sponge titanium manufacturing apparatus including the connecting pipe, method of manufacturing sponge titanium using the apparatus, and sponge titanium manufactured by the method

摘要

A connection pipe for coupling at least one reaction vessel used in producing titanium sponge with at least one recovering vessel for condensing and recovering magnesium and magnesium chloride separated from the titanium sponge in the reaction vessel; wherein the connection pipe is configured as a dual wall structure constituted of an inner pipe and an outer pipe, and comprises at least one heating unit provided between the inner pipe and the outer pipe, two or more sets of lead terminals located through the outer pipe to provide electrical connection to a power terminal in the outside of the connection pipe, insulators for sealing the lead terminals, lead wires for electrically coupling the heating unit with the lead terminals, and a stress absorbed portion provided on the outer pipe; wherein the stress absorbed portion is provided between the lead terminals thereby preventing short circuit and meltdown of the lead wires.