Separation and recovery of aluminum electrolytic cell lining solid waste and electric resistance furnace for desulfurization of petroleum coke

Abstract

The invention relates to a resistance furnace for separating and recycling aluminum reduction cell lining solid waste and petroleum coke for desulfurization. The resistance furnace comprises a furnace shell, a ball coronary furnace lid, a furnace lining, cylinder-type fire-resistant concrete masonry, a fire-resistant concrete top plate, a heat insulating cover plate and two graphite electrodes; a well type main material chamber, a well type auxiliary material chamber and a well type cavity which are formed by multiple fire-resistant concrete walls in an enclosure mode are arranged between the inner wall of the cylinder-type fire-resistant concrete masonry and a fire-resistant concrete sleeve, the well type main material chamber is filled with resistance heating elements formed by fragment materials of aluminum reduction cell cathode carbon blocks or fragment materials of a petroleum coke top plate, and an upper graphite electric conductor and a lower graphite electric conductor connects the resistance heating elements in series. According to the device, by means of vertically arranged resistance heating elements, at the same time of uniformly distributing the temperature in the radial direction of a cylinder type furnace body, the effect of uniformly distributing an axial current is achieved, compared with a traditional technology, a single furnace loading capacity can be further expanded, and the production efficiency and separation effect are improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and environment, and in particular relates to a resistance furnace for separating and recovering aluminum electrolyzer lining solid waste and petroleum coke desulfurization. Background technique [0002] Aluminum is produced by cryolite-alumina molten salt electrolysis. The electrolytic cell used for cryolite-alumina molten salt electrolysis to produce metal aluminum produces a large amount of fluoride electrolyte and metal sodium in the process of overhaul after damage. Waste cathode carbonaceous carbon blocks and solid waste of refractory materials containing fluoride. The fluoride electrolyte in these solid wastes is a toxic and harmful substance. If these solid wastes are discarded, it will have a serious impact on the environment. Therefore, people have not stopped Research on harmless treatment, separation and recycling of aluminum electrolytic cell solid waste. Many patents have been ap...

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Problems solved by technology

Although the device invented by the patent CN 105603216 A uses a graphite block with good conductivity in the scrap material of the aluminum electrolytic cell waste cathode carbon block as a resistance heating element, it can make some adjustments to the problem that the conductive current is biased to the inner loop , but this problem cannot be completely solved by this method, the problem of the conduction current being small up and down big, and the resulting problem of the internal temperature of the resistance heating element being low and high cannot be fundamentally solved;

[0006] 2. The structure of this kind of furnace, because the cross-section of the waste cathode carbon block used as the resistance heating element cannot be too large (too large will easily make the heating current unevenly distributed), so the output of a single furnace is limited

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