Gravity-Assisted Metallothermic SHS of Titanium Aluminide with Al–Ca Mixture as a Reducing Agent

The gravity-assisted combustion synthesis of γ-TiAl from oxide raw materials by using Al–Ca mixture as a reductant was explored. The use of Al–Ca reductant markedly increased the yield of TiAl and decreased the amount of residual contaminants (such as oxygen, nitrogen, carbon) in target product.     

Analysis of the Quality of Coking Coal Concentrates from Kuzbass

The concentrates of coals and charge mixtures from PAO Koks were studied with the use of a set of methods for the analysis of their quality in order to evaluate their composition and chemical-engineering properties. The yield of the chemical products of coking was determined, and the thermogravimetric analysis of thermolysis processes in an inert atmosphere was performed.     

Investigation into the properties of basalt of the Vasil’evskoe deposit in Yakutia as the raw material for obtaining continuous fibers

The results of investigations into the chemical and mineralogical composition of potentially suitable petrurgical raw materials of the Vasil’evka deposit for producing continuous basalt fibers and composite materials on its basis are presented. Electron probe microanalysis and petrographic analysis are used. The performed investigations proved the possibility of obtaining continuous basalt fibers based on basalt from the Vasil’evka deposit in Yakutia, since its composition and main characteristics correspond to requirements imposed on petrurgical raw materials by the viscosity modulus, the pyroxene composition, the presence of phase transformations, etc.     

SHS of ultrafine and nanosized refractory powders: An autoreview

Overviewed are some results of our recent works aimed at the synthesis of ultrafine and nanosized refractory powders by SHS combined with chemical dispersing of combustion products. The microstructure of synthesized powders was found to depend on the type and amount of added modifying agents. Successive chemical dispersing of raw products with solutions of different acids, alkalis, and salts leads to an increase in the specific surface and a decrease in the particle size caused by dissolution and wash-out of the impurities and intermediate products present in raw products. Our experience in preparation, separation, and purification of SHS-produced nanopowders can be used as a basis for elaboration of general methodology for pilot-scale production of nanostructured compounds and composites.     

Composition of humic acids in peats with various degrees of humification

The structure peculiarities of humic-like substances in plants at a dying stage, humic acids in peat-forming plants humified for two years, and native peats at branches of the Vasyugan bog were determined using spectroscopic techniques. The polydispersity and absorbance of humic acids increased with the degree of humification; the concentration of aromatic and carbonyl-containing carbon in the chemical composition of humic acids increased.     

Methods for decreasing the ammonium nitrogen content of dephenolated water from the Kiviter process

Methods for the removal of ammonium nitrogen from dephenolated Kiviter process water were studied. Aeration and distillation methods were compared. Changes in the chemical oxygen demand of dephenolated water with the use of these methods were demonstrated.