Abstract
In the sources of scientific literature, there is still little systematic data on the phase equilibria, possible forms and compositions of arsenate compounds formed during pyrolysis, and the kinetic characteristics of the processes occurring. Despite the fact that such approaches have been sufficiently developed in practice, the increase in the arsenic content in primary raw materials has already made its own adjustments and requires additional research both in terms of the theory of phase equilibria of oxides and arsenate-arsenite compounds, and in terms of using the new data obtained to develop optimal solutions for practice. The results of thermogravimetric investigations of the synthesized calcium arsenate and its mixture with pyrite in the atmosphere of air, nitrogen and vacuum. The mechanisms of dehydration Arce-coordinate of calcium and sulfiding pyrite during heating. Calculated values of apparent activation energies of the processes.