Method for improving rheological property of coal pitch and increasing coking value of coal pitch and modifier thereof

Abstract

The invention relates to a method for improving rheological property of coal pitch and increasing a coking value of coal pitch and a modifier thereof. The method achieves the purpose of improving the rheological property of pitch at the kneading temperature of 160 to 180 DEG C under the premise of ensuring the high-temperature coking value of the pitch by adding the multicomponent modifier into molten pitch under the premise of the existing preparation technique of carbon anode for aluminium. The modifier consists of oleic acid or dibutyl phthalate and ultrafine graphite powder or carbon powder with the granularity of not more than 40mum. The introduction of the multicomponent modifier can enhance the reactivity of anode impedance air and CO2, can reduce the mixing quantity of pitch in the kneading procedure properly and achieve the purpose of improving the anode quality and reducing the flue gas emission of the pitch.

Description

A method for improving the rheology of coal tar pitch and increasing the coking value of coal tar pitch and its modifier technical field The invention relates to a method for modifying coal tar pitch, a carbon anode binder used in aluminum electrolysis, and a modifier thereof. Background technique In the aluminum electrolysis process, the overall quality of the anode has an important impact on the current efficiency, electrolysis energy consumption, electrolysis production stability and cost. As a binder for carbon anodes, the performance of coal tar pitch is closely related to the quality of the anode. The key properties of coal tar pitch include rheology, coking value, cohesiveness, etc. During use, a problem worthy of attention is how to ensure that coal tar pitch can have good fluidity under the premise of good cohesive properties. Denaturation (capable of fully wrapping carbon aggregates and penetrating into the pores of aggregate particles within an effective time),...

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Problems solved by technology

In addition, there are a total of 372 technical inventions related to asphalt modification. It can be found from a summary that, except for the patent "a modified asphalt and its production method" (patent number: 03133782.1, see the above article 1 for detailed description), other inventions Neither involved carbon anodes for aluminum

To sum up, for the carbon anode binder coal tar pitch used in aluminum electrolysis, there is no related technology that can improve the rheological properties of coal tar pitch by introducing modifiers and ensure that the coking value of coal tar pitch is basically unchanged. invention

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