Method for reducing baking energy consumption of prebaked carbon anodes for aluminum electrolysis

Abstract

The invention discloses a method for reducing baking energy consumption of prebaked carbon anodes for aluminum electrolysis, and relates to an improved method for baking prebaked carbon anodes for aluminum electrolysis. The method is characterized in that in the baking process, the smoke exhaust frame total negative pressure is controlled to be 1,600-2,600 Pa; baking curve is controlled to be 26-48 h (250-620 DEG C, 7.5-14 DEG C, / h; 800-1,000 DEG C, 4-8 DEG C / h; 1,000-1,180 DEG C, 3.5-7 DEG C / h); temperature difference between different fire passages at 300-800 DEG C is controlled to be (-30)-30 DEG C; temperature difference between different fire passages at 1,000-1,180 DEG C is controlled to be (-5)-5 DEG C; and upper-lower temperature difference for the same fire passage is controlled to be 0-150 DEG C. The inventive method reasonably establishes baking curve, and reasonably controls exhaust frame total negative pressure to lower practical energy consumption; and effectively controls temperature difference of high-temperature zones and low-temperature zones between different fire passages, and upper-lower temperature difference for the same fire passage, so as to improve qualification rate of prebaked blocks, effectively lower baking energy consumption and reduce carbon anode cost.

Description

technical field [0001] A method for reducing the energy consumption of aluminum electrolytic prebaked carbon anode roasting relates to an improved method for aluminum electrolytic prebaked carbon anode roasting. Background technique [0002] Today, under the situation of serious excess aluminum production capacity at home and abroad and fluctuating and weak aluminum prices, the development and competition of the aluminum industry are mainly manifested in the competition of technology and cost. The necessary conditions; the large-scale, high-efficiency and intensification of the aluminum electrolysis industry has become the mainstream of the development of the modern aluminum industry. In this context, large-scale aluminum electrolytic cells put forward higher requirements for prebaked carbon anodes, which require carbon anodes to bear higher anode current densities, and should have good electrical conductivity, higher thermal shock resistance, and higher Good oxidation resi...

AI Technical Summary

Problems solved by technology

The actual consumption of energy in the roasting process mainly depends on the reasonable roasting curve and reasonable negative pressure control. If the roasting curve is too long, the energy consumed will be higher, and if the roasting curve is too short, it will affect the quality of the pre-baked block. Therefore Reasonably formulate the roasting curve; if the negative pressure is too large, the volatile matter in the carbon anode cannot be fully burned and will be exhausted through the smoke exhaust rack; Enter