ИСТИНА

The use of slag wastes from the production of ferroalloys containing calcium and aluminum oxides, as well as vanadium oxides as impurities, is considered. It is established that vanadium in small quantities at the synthesis of CA and CA2 forms with them solid solutions and increases their hydration activity. The optimum amount of vanadium oxide introduced into the composition of the initial raw mix is 3% wt. The carried out study showed that properties of alumina cement with a small quantity of V2O5 is useful. Hydration activity of alumina cement increases especially at early period of its hydration. Exceeding this value (more than 3%wt in row mix) leads the formation of CaO∙V2O5 along with calcium aluminates. But this compound is characterized by very low hydration activity. Therefore cement strength reduces.