Features of metallurgical graphite intercaling
DOI:
https://doi.org/10.31498/2225-6733.42.2021.240573Keywords:
intercalated graphite compounds, thermografenite, expansion, bulk density, the breaching coefficient of the graphite integrityAbstract
The article considers the distinguishing features of the intercalation of the graphite obtained from the iron-graphite waste of metallurgical production and its subsequent expansion in the falling gravity layer conditions due to shock thermal heating. In doing so, two stages of the process are considered separately: intercalation and thermal expansion. The importance of knowing the distinguishing features of the first stage in terms of ensuring the specified properties of the finished material is emphasized. A new technique and the formula for calculating the theoretical bulk density of intercalated graphite have been proposed depending on the amount and volumes of graphite and intercalate. The assumption has been made and substantiated that the expansion of the graphite particles will occur only in the direction of the «C» axis. Taking into account the fact that the particles will expand 1.45-4.65 times in this direction, it is necessary to amend the calculation formulas of their motion in the falling gravity layer. To obtain reliable results of the calculation, a new concept was introduced – «the graphite integrity breaching coefficient, K» – to calculate the bulk density of intercalated graphite. Based on the experiments, this parameter has been defined in the interval of the volumetric density of intercalated graphite 390-260 kg/m3 with a simultaneous increase in the bulk volume of the layer up to 1.93 m3 of intercalated graphite per 1 m3 of the original graphite. The formula has been derived to calculate this parameter. The final equation has been obtained for calculating the volume density, depending on the initial parameters. As a result of the calculations and the experiments, the numerical values of the breaching coefficient of the graphite integrity have been defined for the values of the volumetric density of intercalated graphite 200-400 kg/m3 – from 3 to 25
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