The influence of pitch impurity content on reactivity of binder coke in anodes

摘要

Controlled carbonization of anode binder pitches under 15 bar inert gas pressure in a specially built reactor,and subsequent heat treatment,has been developed as a method to produce uniform "binder cokes" for laboratory sudies.A number of industrial anode pitches together with some alternative binders have been studied in order to estimate the reactive properties towards CO_2 at 960 deg C and air at 475 deg C of the pitch binder coke in anodes.Simple empirical expressions of gas reactivity versus binder coke impurity content can be used to describe the reactive properties of the coked and calcined pitches.Anode pitches and green anode petroleum coke were heat treated to above prebaked anode baking temperatures in order to evaluate the reactivity development over a larger temperature range.Measurements of CO_2 reactivity,air reactivity and carbon dust generation on baked anodes were performed in order to verify the binder coke tests.