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A model for the formation of calcium carbide in solid pellets
Author(s) -
Brookes C.,
Gall C. E.,
Hudgins R. R.
Publication year - 1975
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450530512
Subject(s) - pellets , carbide , pellet , calcium carbide , materials science , decomposition , thermodynamics , lime , chemistry , chemical engineering , composite material , metallurgy , physics , organic chemistry , engineering
Experiments have been conducted on the formation of calcium carbide in the solid state from 2.22‐cm diameter cylindrical pellets of a 3/1 mole mixture of carbon and lime between 1650°C and 1720°C at 50 mm Hg CO pressure. The reaction was modelled assuming that heat transfer across a growing product layer controls the rate of movement of a reaction front where the overall reaction to form CaC 2 is assumed to occur instantaneously to a fractional conversion f. The model depends upon a knowledge of the CaC 2 decomposition rate in the product layer ko 2 e −ΔE/RgT and the effective thermal conductivity k 0 . These may be estimated from independent data but require adjustment for particular pellet conditions. Good agreement with the data shows that the model is adequate for preliminary design and optimization studies.