EFFECT OF THE STRUCTURE OF BENTONITE CLAY ACTIVATED BY PRESSURE ON THE ADSORPTION INDEX

Abstract

The relevance. The results of the study allow developing a technology for improving the adsorption activity of clays and obtaining modified clay samples with the necessary adsorption properties used for installation of impervious screens and curtains, waterproofing material for industrial and domestic waste storage sites, new pharmaceutical compositions of medicines, including for the technology of solid dosage forms, as well as additives in food supplements for animals with high sorption characteristics. The adsorption capacity of clays is determined by their structure, mineral composition, granulometry, pore solution and sorbate. The main aim: evaluation of the influence of the structure and properties of the pore solution on the adsorption of pressure-activated bentonite clay. The object: enriched bentonite clay, activated by pressure up to 800 MPa. The methods. Information processing was carried out by geological and probabilistic-statistical methods. The results. When clay is activated by pressure up to 150 MPa, the energy potential of the colloid has the greatest influence on its adsorption; with an increase in pressure to 800 MPa – the energy potential of the mineral surface, that is, the energy potential of a structural element of a lower level. The next indicator according to the degree of impact is the pH value of the clay pore solution. Other indicators, including the specific surface area of pores increasing by 25 m2/g, are of secondary importance. A technique for processing information based on a multivariate stepwise regression analysis is proposed, which makes it possible to rank the studied parameters according to the degree of their influence on clay adsorption activity. The authors developed the mathematical models which allow predicting the adsorption activity of pressure-treated clays in terms of water vapor.

Keywords

• clay
• structure
• clay activation
• adsorption
• mineral
• packet
• colloid