Electric furnace structure used for fluoridated salt production and manufacturing method of electric furnace

Abstract

The invention discloses an electric furnace structure used for fluoridated salt production and a manufacturing method of the electric furnace. The electric furnace structure comprises a furnace body (1) and is characterized in that an induction coil layer (2) is arranged on the furnace body (1), a graphite crucible (3) is arranged in the middle of the furnace body (1), and a calcium oxide layer (4) is arranged between the induction coil layer (2) and the graphite crucible (3). An applicant of the invention does a large number of experiments, and screens and compares various fireproof materials, and finds that if calcium oxide is taken as the fireproof material, the fluoridate salt can not leak in the production process, and the service life of the crucible can be prolonged to be more than 10 days. Simultaneously, calcium oxide is wide in source and low in cost, and is the optimal fireproof material for the industrial production of the electric furnace provided by the invention. Compared with the prior art, the electric furnace structure has the advantages that the leakage amount of the fluoridate salt is reduced, the service life of the graphite crucible is prolonged, the production effect is improved, the production cost is lowered, and the like.

Description

Technical field [0001] The invention relates to an electric furnace structure and a manufacturing method for fluoride salt production, and belongs to the technical field of fluoride salt recovery production. Background technique [0002] Chinese patent CN101818253 discloses a method for separating and purifying electrolytic aluminum scrap, which can separate fluoride salt in electrolytic aluminum scrap, and obtain high-purity fluoride salt (cryolite) after melting reaction in an electric furnace. The inventor found in experiments that when the existing intermediate frequency electric furnace heats the fluoride salt, the fluoride salt will leak out of the graphite crucible, and the characteristic of the fluorine element is that it can react with other substances to generate fluoride and reduce its Melting point. Therefore, when conventional refractory materials come into contact with the leaking fluoride salt, the melting point will decrease and it will become liquid, which cannot...

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Problems solved by technology

The inventor found in experiments that when the existing intermediate frequency electric furnace heats fluoride salt, the fluoride salt will leak out from the graphite crucible, and the characteristic of fluorine element is that it can react with other substances to form fluoride, reducing its Therefore, after the conventional refractory material contacts with the leaking fluoride salt, the melting point will decrease and it will also become liquid, which cannot prevent the leakage of the molten fluoride salt

Therefore, ordinary electric furnaces have problems such as easy leakage of fluoride salt, easy damage of graphite crucible and refractory material, frequent replacement, and even contact between leaking molten fluoride and induction coil, resulting in explosion and other problems.

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