Green coke composition

Composites, in the usual sense, were proposed to improve the mechanical stability of the electrode. An example is 80 wt% coke powder in PVC [192]. Of greater interest are carbons with nanodispersed boron (via BCI3, 900 °C). The compound B0.17C0.83 has a reversible specific capacity of 437 Ah/kg [193]. An even stronger enhancement of ilTs, up to 500 Ah/kg could be achieved by silicon (via SiCLj/via Me2Cl2Si, 950 °C) for the composition Si0.nC0.g9 [194,195]. Structural aspects are compiled in Fig. 22. The improved stoichiometry is attributed to the electron-acceptor capability of boron or silicon. Doping of petroleum-fuel green coke by phosphorus elevates by 20% [191]. 

Table 13.2 compares the elementary composition of green coke and calcined coke. 

The anode carbon for the cell is usually a baked composite of calcined petroleum-coke filler bound with coal-tar pitch coke. The carbon composite may either be compacted into blocks which are baked before use in the cell (prebake anode), or be baked in place (as a single block) above the cell as the green paste moves downward toward the anode electrolytic face (Soderberg anode) (1,2.,.2D. For prebake cells, electrical connection is made by inserting a steel conductor rod, or pin, into the top of the anodes, Soderberg anodes may have either vertical (VS) or near-horizontal (HS) conductor rods. 

Composition and Properties Green Delayed Coke Fluid Coke... 

Three main types are produced commercially. Green SiC is an entirely new batch composition made from a sand and coke mixture, and is the highest purity of the three. Green is typically used for heating elements. Black SiC contains some free silicon and carbon and is less pure. A common use is as... 

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