Method for recovering electrolyte by pyrogenic process roasting of electrolytic aluminum carbon slag

Abstract

The invention discloses a method for recovering electrolyte by pyrogenic process roasting of electrolytic aluminum carbon slag. The method is characterized in that the carbon slag is roasted in a smelting furnace to extract the electrolyte, the generated liquid electrolyte is solidified and conveyed through a mold vehicle, and a product is crushed through a crusher, conveyed through a belt, bagged, and returned to an electrolytic cell for production. The method can achieve the following goals that 1), the electrolyte is extracted from the carbon slag, a carbon impurity component is lower than0.5%, and the electrolyte can be directly returned to the electrolytic cell for use; 2), waste heat of smelting furnace flue gas is recovered, the thermal efficiency of the smelting furnace is improved, and a flue gas cooling treatment process is simplified; 3), the problem of blockage of a conventional heat accumulating type furnace heat accumulator is avoided; 4), the problem that a conventionalfurnace lining is prone to corrosion is avoided, and the service life of the lining is greatly prolonged; 5), slagging-off operation is reduced or even avoided; and 6), a workshop working environmentis purified.

Description

technical field [0001] The invention relates to a recovery and utilization technology of electrolytic aluminum waste carbon slag, in particular to a method for electrolytic aluminum carbon slag to be roasted and reduced by fire method, and to extract and recover the electrolyte therein. Background technique [0002] During the production process of aluminum electrolysis, the selective oxidation reaction of the anode carbon block is continuously consumed, and the unburned aggregate particles enter the electrolyte melt to form carbon slag. It is usually necessary to manually remove the accumulated carbon slag out of the tank in a timely manner during cleaning. In order to reduce the adverse effect on the electrolytic production process. Due to the immersion and penetration of the electrolyte, the pores of the anode carbon slag are filled with electrolyte. According to statistics, about 5-20 kg of anode carbon slag is produced per ton of primary aluminum, and the output anode c...

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Problems solved by technology

[0006] However, the following problems exist in the application process of the fire-roasting reduction electrolyte technology: first, the thermal efficiency of the carbon slag smelting furnace is low, and the furnace door emits smoke and fire; production; third, the carbon slag smelting furnace lining wears quickly, affecting normal production

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