The kinetics of the interaction between lithium carbonate and silica with various degrees of dispersion was investigated by
TG and DTA methods. It was found that the utilization of pyrogenic silica with a specific surface area of about 300 m2g-1 instead of aerosil with one of 175 m2g-1 leads to an increase of the reaction rate between lithium carbonate and silica, which depends on the formation and growth
of lithium orthosilicate crystals in the first stage, and is conditioned by the diffusion of lithium and oxygen ions through
the lithium orthosilicate layer formed at temperatures above 800 K. This supposition is supported by the kinetic analysis
results obtained with the use of the different models. The optimal regime of heating is recommended.