A kind of modified pitch for producing anode carbon block and preparation method of modified pitch

Abstract

The present invention belongs to the chemical field, and more particularly relates to a modified asphalt for producing an anode carbon block, and a preparation method thereof, wherein the modified asphalt comprises, by mass, 50-85 parts of asphalt, 5-15 parts of an asphalt modifier A, and 3-8 parts of an asphalt modifier B. The preparation method comprises: preparing raw materials, carrying out heating cross-linking fusing modification with the asphalt modifier A, and carrying out cooling modification with the asphalt modifier B so as to obtain the modified asphalt. According to the present invention, the asphalt is adopted as the raw material and the performances of the asphalt are improved, such that the coking property of the asphalt can be improved by adjusting the Coal tar Pitch softening point, the toluene insoluble content and the beta resin content during the application of the modified asphalt to produce the anode carbon block, and the oxidation resistance of the pitch coke can be improved; and the preparation method is simple, and has the generalization.

Description

【Technical Field】 [0001] The invention belongs to the field of chemistry, and particularly relates to a modified pitch used for producing anode carbon blocks and a preparation method of the modified pitch. 【Background technique】 [0002] At present, the production of pure aluminum mainly uses Hall-Heroult's cryolite-alumina molten salt electrolysis method. The anode material is a consumable carbon product, which is the "heart" of electrolytic aluminum. Carbon anode consumption is one of the main costs of electrolytic aluminum production, accounting for about 15% of the total cost. In the process of electrolytic aluminum production, carbon anode consumption includes electrochemical consumption, chemical consumption and mechanical consumption. Among them, carbon anode and CO 2 The chemical consumption caused by the oxidation reaction with air at high temperature is the main reason for the excessive consumption of the anode, accounting for about 7%-20% of the entire carbon consumpt...

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Problems solved by technology

Moreover, the excessive consumption of the anode will lead to an increase in the frequency of anode replacement, which will not only increase the labor intensity of the workers, but also make it difficult to implement the modern high-efficiency energy-saving process technology characterized by low anode effect, and reduce the efficiency of the electrolytic cell.

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