Improvement of the hydrophysical properties of substrates of technogenic landscapes using expanded vermiculite

Abstract

A study of the hydrophysical properties of substrates of technogenic landscapes, an assessment of the prospects of using thermoactivated vermiculite as an ameliorant was carried out. Contaminated areas are characterized by the absence of vegetation and a low probability of initiating the process of soil formation without direct intervention. Thermally activated vermiculite has been proposed as an ameliorant to improve the quality of soil and reduce the geochemical mobility of metals. The proposed materials have water-retaining properties, high sorption activity with respect to a number of metals, developed specific surface area and availability in sufficient quantities. The use of local mining enterprises as remediators of waste makes it possible to increase the profitability of developments and helps to reduce the volume of accumulated waste.

Influence of Reagents on Qualitative Indicators of Artificial Anti-Deflationary Phytocenosis on Waste from a Rare Earth Tailing Facility

“…According to the State Standard [ 41 ], soils are recognized as suitable for biological recultivation without improvement of physical properties if the content of fraction < 0.01 mm (clay) is from 10–75%. Loparite ore enrichment tailings are characterized by a very low proportion of the fraction favorable for reclamation (17.6 ± 0.6%) [ 42 ], which indicates the need for conditioning.…”

“…The content of the main components by wt. % was as follows: SiO 2 —30.9, MgO—27.0, Al 2 O 3 —9.6, Fe 2 O 3 —5.3, CaO—4.0, Na 2 O—3.3, K 2 O—0.9, C—0.5, H 2 O—7.7 [ 42 ]. The firing of the starting material was carried out in a modular-triggering furnace, in which the mechanism of thermal shock was implemented as the most effective method for obtaining vermiculite for 2 h at a temperature of 500 °C [ 43 ].…”

“…According to the State Standard [41], soils are recognized as suitable for biological recultivation without improvement of physical properties if the content of fraction < 0.01 mm (clay) is from 10-75%. Loparite ore enrichment tailings are characterized by a very low proportion of the fraction favorable for reclamation (17.6 ± 0.6%) [42], which indicates the need for conditioning. The hygroscopic moisture content of the loparite ore enrichment tailings is about 0.98-1.01%, which is close to the moisture content of plant wilting on technogenic lands of the European North, which is limited by values of 0.54-2.85% [51].…”

Method for treating wastewater from nitrogen group in the Murmansk region

“…The content of the main components is, wt. %: SiO2 -30.9; MgO -27.0; Al2O3 -9.6; Fe2O3-5.3; CaO -4.0; Na2O -3.3; K2O -0.9; C -0.5; H2O -7.7 [22]. The firing of the starting material was carried out on a modular-triggering furnace, in which the mechanism of thermal shock was implemented as the most effective method for obtaining thermovermiculite for 2 hours at a temperature of 500 °C [22].…”