CONTROL OF AGGREGATE STABILITY AND RHEOLOGICAL QUALITIES OF CACO3 BY THE ADDITIVE BASED ON PIROCATECHOL PRODUCTION WASTE
The article deals with the study of colloidal and chemical qualities of aqueous dispersions of chalk containing the additive based on pyrocatechol production waste. The rheological and electrokinetic characteristics of the suspensions have been studied as well as the influence of the additive on the dispersion aggregate stability. The value of yield strength is practically reduced to zero as the result of the additive adsorption on the suspensions particles. It has been found that the additive under study is more active on the solid-solution interface than on the solution-air interface in aqueous suspensions. It leads to the lyophylization of the particles surface that provides the aggregate stability of dispersions due to adsorption-solvent factor. The change of ζ-potential demonstrates the contribution of the electrokinetic factor of the aggregate stability. The received data develops the ideas about the mechanism of the additives action on aqueous dispersions and let us claim that the plasticizing agent based on stillage residues of pirocatechol production gives the opportunity to regulate colloidal and chemical qualities of aqueous mineral dispersions.