Method for preparing sponge titanium on special resistance furnace by molten salt electrolysis method

Abstract

The invention discloses a method for preparing sponge titanium on a special resistance furnace by a molten salt electrolysis method. The method comprises the following steps of: placing a crucible (1) filled with a calcium chloride molten salt (19) into a vacuum reactor (2); performing low-constant-temperature water-pumping treatment on the calcium chloride molten salt in the crucible at first; after water is removed, charging argon via an argon inlet tube (11), and cooling a furnace upper cover (16) via a water jacket (6); heating the special resistance furnace (3) to 1000 DEG C at a constant speed; automatically lowering two electrode rods (14) via a lifting rod (13) to cause titanium dioxide (7) and a graphite plate (17) to enter in the crucible, and controlling currents to be 50 A; exhausting the carbon monoxide and carbon dioxide generated by electrolysis, and the remainder argon into a waste gas recovery tank via a gas outlet tube (15); and when the vacuum reactor is automatically cooled to a room temperature along with a furnace body, lifting the furnace upper cover and a fire-resistant cover (8) out of the furnace body via the lifting rod under the action of a limit baffle (9), and taking out the electrolysed titanium dioxide.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a method for preparing sponge titanium by using a molten salt electrolysis method on a special electric resistance furnace. Background technique [0002] The more mature titanium smelting process is the Kroll method. The Kroll method is discontinuous, which not only has high production costs, large equipment losses, but also serious environmental pollution. [0003] In order to reduce its production cost and expand its production scale, FFC molten salt electrolysis method is also adopted. The process operation of molten salt electrolysis titanium smelting method is still in the experimental stage, and its process is roughly as follows: [0004] Titanium dioxide electrode sheet preparation → molten salt electrolysis → electrode sheet cleaning → detection [0005] The above-mentioned molten salt electrolysis is the key process of the molten salt electrolysis method. T...

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Problems solved by technology

[0008] In order to solve the problems in the molten salt electrolysis method such as poor vacuum sealing, poor corrosion resistance of high temperature molten salt, and high energy consumption of the resistance furnace, the invention provides a special resistance furnace using molten salt A method for preparing titanium sponge by electrolysis. In this method, a vacuum reactor is embedded in a special resistance furnace, and the matching refractory cover is used to seal the vacuum reactor, and the matching furnace cover is used to seal the special resistance furnace. The thermal efficiency can be fully exerted, and titanium sponge with better quality can be electrolyzed, making the development technology of FFC molten salt electrolysis more mature, safe and energy-saving

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