Magnesium-Containing Slurry as Technogenic Alternative Raw Material for Magnesium Oxychloride Cement

It has been shown experimentally that a waste of magnesium metal production is a realistic alternative to naturally occurring cement raw materials. The waste is the carnallite slurry forming during the chlorination stage. The slurry contains magnesium oxide (MgO) and magnesium chloride (MgCl2) in a mass ratio close to their optimal ratio when preparing Sorel cement. It is found that the magnesium oxide in the slurry is highly reactive. MgO extracted from the slurry and MgCl2 solution are mixed forming homogeneous magnesium oxychloride cement (MOC) paste in which bonding crystalline structures typical for Sorel cement are formed during hardening. © 2019 Published under licence by IOP Publishing Ltd

Synthesis and sorption properties of filled fibrous sorbents with immobilized hetarylformazan groups

New sorbents were prepared by immobilization of structurally different sulfur-containing hetaryl-formazans on nonwoven polyacrylonitrile fiber tilled with AV-17 anion exchanger. Sorption of some heavy metals on these materials was studied as influenced by various factors. Sorbents for selective recovery of copper(II) in the presence of nickel(II), zinc(II), and cadmium(II) cations were found

Synthesis and catalytic properties of copper(II) 1-aryl-5-benzothiazolylformazanates

New copper(II) benzothiazolylformazane complexes were synthesized and immobilized on AN-18 anion exchanger. The influence of the composition of the coordination core of copper(II) benzthiazolylformazanates and temperature on their catalytic properties in decomposition of H2O2 and oxidation of Na2S in aqueous solution was studied

Synthesis and spectroscopic features of iron(II) 1-aryl-5-benzothiazol-2- ylformazanates

New iron(II) coordination compounds with 1-aryl-5-(benzothiazol-2-yl) formazans were prepared. Their compositions and structures were determined by electronic spectroscopy, mass spectrometry, single crystal X-ray diffraction analysis, and magnetochemical measurements. © 2008 Pleiades Publishing, Ltd.Russian Foundation for Basic Researc

Solid-Phase Reagents on the Modified Silica Gel Base for the Rapid Determination of Nickel(II) Ions

The new solid-phase reagent is synthesized by previous modifying the surface of silica gel with l-(4-sulfophenyl)-3-methyl-5-(benzoxazol-2-yl)formazan for Ni(II) ions determination in water. The high effective colour change (Δλ = 200 nm) is observed due to complex-formation reaction reagent with nickel (II) ions. Increasing toxicant concentration is accompanied by growth the colour intensity of the solid-phase sorbent, which form the basis of colour scale development for the Ni(II) ions determination in the range 10-100 mkg/ml. Ni(II) ions determination can't be disturbed by the presence of Co(II) ions, alkali or alkali-earth metal ions. Proposed technique is high rapid (its max duration is 2-3 min), ordinary (it is required neither expensive equipment nor qualified staff to use the technique) and ecological friendly. © Published under licence by IOP Publishing Ltd

Synthesis and Structure of Zinc(II) Complexes with 2,2'-Bipyridine

The structure of zinc(II) complexes with 2,2'-bipyridine obtained by a direct synthesis from multicomponent mixtures was studied by the method of X-ray structural analysis. The effects of the ligand environment on the composition of Zn|NxOy| coordination unit and on the nature of resulting polyhedra in the synthesized complex compounds were established. © 2018, Pleiades Publishing, Ltd

СОРБЦИЯ БОРНОЙ КИСЛОТЫ АНИОНИТАМИ ПОЛИКОНДЕНСАЦИОННОГО ТИПА

The article presents the results of a study the influence of such factors as pH, temperature, and boric acid concentration on the boron sorption behavior in model aqueous solutions under static conditions by various forms of polycondensation anion exchangers based on monoethanolamine and epichlorohydrin (SB-1) and pyrocatechol and formaldehyde (SB-7). The hydroxyl-form polycondensation anion exchangers, as well as polymerization ones, have a higher sorption activity and selectivity for boron compared to anion exchangers in the boron salt forms, while SB-1 anion exchanger containing aminooxyethyl functional groups possesses the highest sorption activity and selectivity to boron. The established relationships and results of kinetic and IR spectroscopic studies have revealed that the sorption of boric acid by SB-1 anion exchanger is carried out by two complementary mechanisms. They are: 1) chemisorption of boric acid by OH groups of the anion exchanger, accompanied by the formation of the mononuclear borate anion exchanger, [B(OH4)]−, followed by the formation of polynuclear forms of boron, [B4O5(OH)4]2− in the sorbent phase and 2) complex formation of tetraborate anions with the nitrogen atom in aminooxyethyl groups. This fact explains occurring super-equivalent sorption of boron from boric solutions at a concentration more than 0.057 M and pH 5.0–7.5. © 2021. All Rights Reserved

Метод оценки надежности арктических тр убопроводов в пространстве нагрузок

The paper presents a comprehensive study of sludge forming in carnallite chlorinators while magnesium manufacturing, VSMPO-AVISMA Corporation, Russia. The sludge contains two principal products MgO and MgCl2 used in magnesiumbased cements manufacture. Chemical and phase compositions of the sludge, mass ratio of magnesium components presented in the sludge, reaction capacity of MgO extracted from the sludge, MgO binding properties, the sludge properties, its radiation safety, and sanitary and epidemiological safety have been thoroughly studied. It has been concluded that it was made the conclusion about the possibility of recovering and recycling the sludge to magnesium cementing powder. The kinetics and thermodynamics of the hydration of magnesium oxide in the sludge were studied. The study has proved high chemical reactivity of magnesium oxide and its ability to form а magnesium mixture followed by the forming the crystallohydrate structures which are characteristic for the magnesium mixture, made of caustic magnesite gaged by magnesium chloride solution. The optimal parameters for the process of forming the magnesium mixture have been established.Проведено комплексное исследование шламов карналлитовых хлораторов магниевого производства ОАО «Корпорация ВСМПО-АВИСМА», содержащих в своем составе два основных магнезиальных компонента MgO и MgCl2, участвующих в формировании магнезиальных цементов. На основании изучения химического, фазового состава шлама, массового соотношения в шламе магнезиальных компонентов, реакционной способности MgO, выделенного из шлама, вяжущих свойств MgO и самого шлама, его радиационной и санитарно-эпидемиологической безопасности сделан обоснованный вывод о практической возможности регенерации и последующей утилизации шлама в порошок магнезиальный вяжущий. Результаты изучения кинетики и термодинамики процессов гидратации оксида магния в шламе подтвердили его высокую химическую активность и способность к образованию магнезиального теста с последующим формированием кристаллогидратных структур, характерных для магнезиального теста, полученного при затворении вяжущего каустического магнезита раствором хлорида магния. Установлены оптимальные параметры процесса образования магнезиального теста в системе шлам — вода

ГЛОБАЛЬНОЕ ОПРЕДЕЛЕНИЕ СОЦИАЛЬНОЙ РАБОТЫ, ЕГО ОНТОЛОГИЯ, ЗНАЧЕНИЕ И ПОСЛЕДСТВИЯ

In the article on the basis of the new global definition of social work it is proposed that there be a redefining of the Institute of Social Work functions, the reorientation of the profession towards social development, social justice and achieving people's well-being. This would also include the empowerment and liberation of individuals and social groups due to the changed socio-economic conditions. This rethinking converges collectivist and individualistic approaches in social work. Further, it requires an updating of the scientific and academic basis of the profession and recognizes the need for the orientation of the profession to the macro-level. This in turn leads to the adoption of a setting where the responsibility for social disasters faced by individuals and social groups is shared both by themselves and society as a whole. The critical rethinking of the consequences of this shift from individualistic approaches in social work to the understanding of the importance of collectivist solutions leads to the need of strengthening social work ties within the complex of socio-humanitarian disciplines, especially sociology. In the context of the new global definition, social work can be considered a part of applied sociology. As a profession, social work requires defining of how its theory, academic disciplines and technologies comply with new ideas in the global space of the modern world. An updated rereading of the global definition and its consequences will define guidelines to address contemporary issues based on the expansion of the social worker's role in society. This is especially important for Russian social work, which is currently expanding the scope of its activities, while embracing new technologies and approaches. The original language of this article is Russian

Bacterial Degradation of PCB 70 and its Hydroxy Derivatives is an Environmentally Friendly Way to Destroy Pops

One of the problems of our time is the environmentally safe destruction of polychlorinated biphenyls (PCBs) and their hydroxylated derivatives. The aim of the study was to investigate the features and prospects of the decomposition of PCB 70 (2,5,3’,4’-tetrachlorobiphenyl) and hydroxylated chlorobiphenyls derived from it by Rhodococcus wratislaviensis strain CH628. As a result of the application of methods of periodic cultivation, gas chromatography and light spectrometry, it was found that the efficiency of destruction of PCB 70 1 g of cells of strain CH628 was 90 mg PCB/day, and the same indicator for a mixture consisting of hydroxy derivatives obtained from PCB 70 was 56 mg PCB/day. It was shown that the strain uses all components of the mixture of hydroxy-PCB 70 as a growth substrate, but with different degradation rates. When cultivated in a mineral medium with PCB 70 or a mixture of hydroxy-PCB 70, strain CH628 forms biofilms. The analysis of the obtained results shows that the use of the Rhodococcus wratislaviensis CH628 strain will make it possible to develop a technology for the environmentally safe destruction of PCB 70 and hydroxy-PCBs derived from it