Material Composition of Clay From the Al-Najaf Field (Iraq)

Abstract

A comprehensive study of the material composition of clay raw materials of the al-Najaf field (Iraq), which belongs to the sedimentary deposits of the Dammam formation, is conducted. The features of the chemical and phase composition of the rock are determined using x-ray phase, energy dispersive, microrentgenospectral, electron microscopic and thermogravimetric methods of analysis. The presence of titanium as an impurity element is detected in the studied clay along with the typical element composition of aluminosilicates using energy-dispersion-spectral analysis. At the same time, a high total content of oxides of alkaline and alkaline earth metals (Cao, Na2O, K2O) is recorded, amounting to more than 5.0 wt. %. It is found that the sample under study has a polymineral composition, the main rock-forming minerals are kaolinite, illite and montmorillonite. The total percentage of the clay component is more than 82 wt.%. Content of clay particles belonging to high-and medium-dispersed fractions (size 10 microns or less) it is more than 60% by weight. The average size of the particles composing the studied clay is about 32.0 microns. Based on the data on the chemical, mineralogical and granulometric composition of the sample, a conclusion is made about the potential suitability of the studied clay as a sorption-active material, as well as in the production of Portland cement and coarse ceramics.

On the adsorption mechanism of copper ions on bentonite clay

“…The substantial composition of the studied sample of montmorillonite clay was studied in detail. 37,38 The adsorption capacity of bentonite clay toward Cu 2+ ions was determined spectrophotometrically by a standard procedure using a KFK-3-01 photocolorimeter and a Specord 50 spectrophotometer. Copper ions were sorbed on bentonite clay under static conditions at a constant temperature (20 С) from a model solution of copper sulfate pentahydrate with a concentration of Cu 2+ ions of 5 mg L -1 .…”

“…The Langmuir isotherm is known to charac terize coverage of the uniform surface, whereas the Freundlich isotherm equation is applicable to adsorption processes that occur on heterogeneous surfaces 31 and have the exponential distribution of active sites over the adsorption energy. 32 An analysis of published data 27, [30][31][32][33][34][35][36][37][38] show that the mechanism of sorption of Cu 2+ ions from aqueous media on bentonite clay is a matter of discussion. Therefore, it was of interest to reveal the applicability of the indicated equations to interpret experimental data on Cu 2+ adsorption on bentonite clay and to choose a model that would describe the process most precisely.…”

Soil contamination with heavy metals in the sh. Rashidovsky district of Jizzakh region and methods of their decrease from the soil composition

“…Sorption cleaning of soils from heavy metals studied by A.I. Vezentsev and others [2]. The article presents the results of a study of the ability of clays of the Belgorod region to absorb Pb (II) and Cu (II) ions from water and buffer soil hoods.…”