Trends in the use of bentonite clays

Abstract

The paper gives a general description of the areas of application of bentonite clays. A number of deposits were evaluated in terms of their use in various technological processes. Analysis of directions of application of bentonite clays in foundry was carried out.Using the methods of X-ray and gas chromatographic analysis, scanning electron microscopy, thermogravimetry and direct adsorption-structural measurements, it is shown that materials obtained from montmorillonite and heteronuclear hydroxo complexes Cr-Cu have greater thermal stability and better sorption characteristics compared to montmorillonite fixed by mononuclear hydroxo complexesUsing montmorillonite modified with heteronuclear hydroxo complexes Cr-Cu with the best adsorption-structural parameters and zeolite NCVM, a laboratory batch of mixed adsorbent catalysts has been developed.This material has been studied in deep vapor oxidation processes of low concentrated organic substances such as acetone, toluene, ethyl acetate, ethanol, butanol and butyl acetate.The conversion rate on the mixed adsorbent catalysts for the studied adsorbates was found to be 94.9–97.7 (average 96.2 %).

The effect of mechanical activation methods on the properties of local clays and waste bentonites

“…One of the most important indicators of mechanical activation of clay minerals is the effect of activation time on the strength of the mixture [6], and the results are presented in Figure 1. If we conclude from this, we can increase the strength of low-quality clays and mechanical activation of bentonites with production waste to 0.78ꞏ105 Pa (PB) and Simferopol bentonite to 0.81 [6][7][8].…”

“…One of the most important parameters of clays used in the preparation of drilling fluids resistant to thermomechanical effects is their colloidal index [11,12]. Therefore, the effect of mechanical activation time on the colloidal index of these clays was investigated and the results are presented in Figure 3.…”

“…Effect of activation time on mixture strength. Increasing the mechanical activation time to 115 seconds increased the wet strength of the mixture by 0.45-0.78 105 Pa (NKIB), 0.51-0.81 NK IER, 0.52-0.79 PB and 0.50-0, 77 SB can be seen to change to 105 Pa.If we conclude from this, we can increase the strength of low-quality clays and mechanical activation of bentonites with production waste to 0.78ꞏ105 Pa (PB) and Simferopol bentonite to 0.81[6][7][8].One of the most important parameters in the preparation of drilling fluid based on clays is their ability to swell[9,10]. Therefore, we studied the effect of mechanical activation time on the compaction of clays.…”

Study of the possibility of using a sorption mesh to clean the air from formaldehyde

“…There is a method of air purification that involves passing air through a biologically active adsorbent, as which a mixture of zeolite with ammonia-containing sawdust is used [15]. Sorption materials based on high silica zeolite are known, which also showed a high degree of purification from formaldehyde [16]. In our case, for local purification of atmospheric air from formaldehyde it was proposed to use sorption nets (mosquito nets for windows), covered with carbon sorbent.…”

Bentonite clays of the Central Kyzylkum and their material composition and engineering and geological properties, Uzbekistan

“…It is known that clays and clayey soils have a specific feature to change their properties when interacting with water, i.e., exhibit structural instability. In many cities and towns, these soils create serious problems leading to accidents and catastrophes of structures interacting with these soils, subject to urbanization and technogenic development [1][2][3][4].…”